To see the other types of publications on this topic, follow the link: Three Phase Grid Side Inverter.
Journal articles on the topic 'Three Phase Grid Side Inverter'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Three Phase Grid Side Inverter.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Wang, Xianbo, Zhixin Yang, Bo Fan, and Wei Xu. "Control Strategy of Three-Phase Photovoltaic Inverter under Low-Voltage Ride-Through Condition." Mathematical Problems in Engineering 2015 (2015): 1–23. http://dx.doi.org/10.1155/2015/790584.
Full textAbstract:
The new energy promoting community has recently witnessed a surge of developments in photovoltaic power generation technologies. To fulfill the grid code requirement of photovoltaic inverter under low-voltage ride-through (LVRT) condition, by utilizing the asymmetry feature of grid voltage, this paper aims to control both restraining negative sequence current and reactive power fluctuation on grid side to maintain balanced output of inverter. Two mathematical inverter models of grid-connected inverter containing LCL grid-side filter under both symmetrical and asymmetric grid are proposed. PR controller method is put forward based on inverter model under asymmetric grid. To ensure the stable operation of the inverter, grid voltage feedforward method is introduced to restrain current shock at the moment of voltage drop. Stable grid-connected operation and LVRT ability at grid drop have been achieved via a combination of rapid positive and negative sequence component extraction of accurate grid voltage synchronizing signals. Simulation and experimental results have verified the superior effectiveness of our proposed control strategy.
2
Wu, Kui Hua, Wei Sun, Jian Wang, Shen Quan Yang, Yi Qun Wang, and Bo Li. "Design of the Three-Phase Photovoltaic Grid-Connected Inverter." Advanced Materials Research 986-987 (July 2014): 1938–41. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1938.
Full textAbstract:
Photovoltaic grid-connected power generation is the inevitable development trend of solar photovoltaic systems,grid inverter is an essential part of photovoltaic grid-connected power generation. With the developed three phase current type PWM inverter device as the research object, and symmetry rules sampling method is applied to the inverter, through the method combined by the computer simulation and experiment research, the device was verified by simulation and experimental .The results show that: This method could not only effectively reduce the DC side inductance volume of the current-mode PWM inverter , and it could make output AC currents sinusoidal and in phase with grid voltages, but also improve the efficiency of the system, it will be more suitable for photovoltaic grid-connected.
3
Rahman, Tawfikur, S. M. A. Motakabber, and M. I. Ibrahimy. "Design and Simulation of a PWM Based Phase Synchronous Inverter for Utility Grid Systems with 20km Feeder Line." Scientific Research Journal 14, no. 2 (2017): 17. http://dx.doi.org/10.24191/srj.v14i2.4903.
Full textAbstract:
In recent years, the utility grid system is more essential for the power transmission and distribution system because it cannot produce harmful gases or no discharge waste in the environment. PWM based phase synchronous invert systems are generally utilised in the high efficiency energy supply, long distance and higher power quality. The inverter output voltage depends on the coupling transformer, input sources and invert controllers. An inverter using a three leg IGBT has been designed for utility grid and simulated by using MATLAB2014a. In this paper, both sides of the LCL filters are used for removing the DC ripple current, reducing the noise and synchronous the output phase between inverter and the utility grid. The PWM controller has created pulse signal to control the inverter, electronic switches and precisely synchronise with grid line frequency. In this system, the input DC voltage 500V, switching frequency 1.65 kHz, grid frequency 50Hz, 20 km feeder (resistance, inductance and capacitance per unit length, which are 0.1153, 1.05e-3 and 11.33e-09 ohms/km) with 30MW three phase load (active and inductive reactive power which are 30e6 W and 2e6 var) and also a balanced utility grid load of star configuration (00, 1200, and 2400 degree) are considered in the design. On the other hand, three phase transformer consists of three signal phase transformers, normal power 100e3, magnetization resistance and inductance which are 500 pu and 416.67pu are considered in this design. The system conversion efficiency is 99.94% and 99.96%, while the total THD are 0.06% on inverter side and 0.04% on grid side.
4
Rahman, Tawfikur, S. M. A. Motakabber, and M. I. Ibrahimy. "Design and Simulation of a PWM Based Phase Synchronous Inverter for Utility Grid Systems with 20km Feeder Line." Scientific Research Journal 14, no. 2 (2017): 17. http://dx.doi.org/10.24191/srj.v14i2.9359.
Full textAbstract:
In recent years, the utility grid system is more essential for the power transmission and distribution system because it cannot produce harmful gases or no discharge waste in the environment. PWM based phase synchronous invert systems are generally utilised in the high efficiency energy supply, long distance and higher power quality. The inverter output voltage depends on the coupling transformer, input sources and invert controllers. An inverter using a three leg IGBT has been designed for utility grid and simulated by using MATLAB2014a. In this paper, both sides of the LCL filters are used for removing the DC ripple current, reducing the noise and synchronous the output phase between inverter and the utility grid. The PWM controller has created pulse signal to control the inverter, electronic switches and precisely synchronise with grid line frequency. In this system, the input DC voltage 500V, switching frequency 1.65 kHz, grid frequency 50Hz, 20 km feeder (resistance, inductance and capacitance per unit length, which are 0.1153, 1.05e-3 and 11.33e-09 ohms/km) with 30MW three phase load (active and inductive reactive power which are 30e6 W and 2e6 var) and also a balanced utility grid load of star configuration (00, 1200, and 2400 degree) are considered in the design. On the other hand, three phase transformer consists of three signal phase transformers, normal power 100e3, magnetization resistance and inductance which are 500 pu and 416.67pu are considered in this design. The system conversion efficiency is 99.94% and 99.96%, while the total THD are 0.06% on inverter side and 0.04% on grid side.
5
Shadab, Mirza Mohammad, Mohammad Arifuddin Mallick, Mohammad Tufail, and M. S. Jamil Asghar. "Development of a Novel Three Phase Grid-Tied Multilevel Inverter Topology." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 3 (2016): 826. http://dx.doi.org/10.11591/ijpeds.v7.i3.pp826-834.
Full textAbstract:
The conventional line-commutated ac-to-dc converters/ inverters have square-shaped line current. It contains higher-order harmonics which generates EMI and it causes more heating of the core of distribution or power transformers. PWM based inverters using MOSFET/IGBT have higher switching losses, and the power handling capability and reliability are quite low in comparison to thyristors/ SCR. A thyristor based forced commutated inverters are not suitable for PWM applications due to the problems of commutation circuits. A pure sinusoidal voltage output or waveform with low harmonic contents is most desirable for ac load using dc to ac conversion. This paper presents a new multilevel inverter topology in which three phase ac- to-dc converter circuits are used in inversion mode by controlling the switching angle. Due to natural commutation, no separate circuit is required for synchronization. In this paper simulation and analysis are done for grid-tied three-phase 6-pulse, Two three-phase, 3-pulse and 12-pulse converter. These converters are analysed for different battery voltage and different switching angle combinations in order to reduce the total harmonic distortion (THD). Three-phase harmonic filters are further added to the grid side to reduce the harmonic content in the line current. A comparative study of these converters is also presented in this paper.
6
Jamuna, Venkatesan, Natesan Saritha, and N. Nanthini. "Fault Analysis on Photo Voltaic Fed Grid Connected Systems." Advanced Materials Research 984-985 (July 2014): 1013–22. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.1013.
Full textAbstract:
This work presents a photovoltaic (PV) system, connected to a three phase grid. This work focuses on fault analysis in a grid connected photo-voltaic (PV) energy system. In this work, a three phase Multi-level Inverter connected with an AC grid fed by photovoltaic systems with advanced sine PWM control scheme is presented. The proposed modulation technique uses single reference signal and number of high frequency carrier signals to generate the PWM signal. Now a days, most of the photovoltaic (PV) power sources are connected to the AC grid. When photovoltaic power sources are connected to grid, the grid connected PV system is affected by various power quality issues like voltage sag, voltage swell, voltage disturbances, waveform distortions and three phase fault. One of the main power quality problems is three phase fault and it is appeared in the grid due to short circuit condition between two phases and ground. Fault analysis is carried out by creating a LG, LL, LLL and LLLG fault in the grid connected systems. Grid side voltage, current and power waveforms at the grid side are analysed with fault conditions. A detailed simulation has been done for the Multi-Level Inverter and the validation of system is verified through MATLAB/SIMULINK and the results are presented.
7
Yahya, Abdelhafid, Hassan El Fadil, and Mustapha Oulcaid. "Output feedback nonlinear control of three-phase grid-connected PV generator." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 1 (2019): 137. http://dx.doi.org/10.11591/ijpeds.v10.i1.pp137-150.
Full textAbstract:
<span lang="EN-GB">This paper addresses the problem of controlling three-phase grid connected PV system involving a PV arrays, a voltage source inverter, a grid filter and an electric grid. This paper presents three main control objectives: i) ensuring the Maximum power point tracking (MPPT) in the side of PV panels, ii) guaranteeing a power factor unit in the side of the grid, iii) and ensuring the asymptotic stability of the closed loop system. Interestingly, the present study features the achievement of the above energetic goal without resorting to sensors of currents of the grid. To this end, an output-feedback control strategy combining a state observer and a nonlinear control laws is developed. The proposed output-feedback control strategy is backed by a formal analysis showing that all control objectives are actually achieved</span>
8
N, Prakash, and Balaji V.R. "Three phase voltage source inverters with grid connected industrial application." International Journal of Engineering & Technology 7, no. 4 (2018): 18. http://dx.doi.org/10.14419/ijet.v7i2.9.9653.
Full textAbstract:
The grid-connected issue is one of the major problems in the field of Power Electronics. In this paper, the Three Phase Voltage Source Inverter (VSI) is controlled by a Space Vector Pulse Width Modulation (SVPWM) Technique. SVPWM control technique and Park transformation, the managed inverter control system to convert input DC power into AC power, stabilize the output voltage and current, and feeds the excess power to the utility grid can be achieved by controllers. Usually, the grid source contains higher level of harmonics. To analyze the harmonics, nonlinear load is connected externally in the point of common coupling. The main aim of this paper is to modeling, simulation and experimental study of the three-phase grid connected inverter. By using the control algorithm, the grid sides Total Harmonics Distortion (THD) are controlled to the 1.54% for 800V DC as per the IEEE standard. The stimulation results such as AC output voltage and current, inverter system power flow, and grid disturbances detection signals, proves the effectiveness of the developed control algorithm. The control algorithms to makes the for this inverter outputs is pure sinusoidal.
9
Geury, Thomas, Sonia Pinto, and Johan Gyselinck. "Assessment of Grid-Side Filters for Three-Phase Current-Source Inverter PV Systems." International Review of Electrical Engineering (IREE) 11, no. 6 (2016): 567. http://dx.doi.org/10.15866/iree.v11i6.10205.
Full text
10
Hammami, Manel, Riccardo Mandrioli, Aleksandr Viatkin, Mattia Ricco, and Gabriele Grandi. "Analysis of Input Voltage Switching Ripple in Three-Phase Four-Wire Split Capacitor PWM Inverters." Energies 13, no. 19 (2020): 5076. http://dx.doi.org/10.3390/en13195076.
Full textAbstract:
Three-phase, four-wire split capacitor inverters are currently employed in many applications, such as photovoltaic systems, battery chargers for electric vehicles, active power filters, and, in general, in all grid-tied applications that deal with possible grid voltage and/or current unbalances. This paper provides a comprehensive evaluation of the capacitor-switching voltage ripple and dc-link switching voltage ripple for the three-phase, four-wire, split capacitor inverters. Specifically, analytical formulations of the peak-to-peak and rms values of the voltage ripples are originally pointed out in this paper and determined in the case of balanced three-phase and unbalanced (two-phase and single-phase) output (ac) currents. The obtained results can help in designing the considered inverter and sizing of the dc-link capacitors. Reference is made to the sinusoidal PWM modulation and sinusoidal three-phase output currents with an almost unity power factor, representing a grid-connected application. Extensive numerical simulations have been carried out to thoroughly verify all the analytical developments presented in this paper. Furthermore, some experimental tests, having balanced output currents on the ac side, have been accomplished, validating numerical simulations and analytical developments.
11
Abed, Jameel Kaduim. "A three phase photovoltaic grid tied inverter system control based on t-s fuzzy equalization." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 2 (2019): 928. http://dx.doi.org/10.11591/ijpeds.v10.i2.pp928-934.
Full textAbstract:
<p>This paper proposed a Takagi-Sugeno fuzzy control method is used to build the model for current controlled of three phase photovoltaic inverter. The three phase inverter connected to grid with L filter. The DC link capacitor is splatted midpoint of three phase four wire and the DC link voltage in the input side of the inverter is considered as input variables value for maximum value of the reference current for the feedback controlled. The proposed of T-S fuzzy control method and hysteresis current control can solve and enhance the THD of the output current of the inverter. The T-S fuzzy is designed to monochrome controller makes the output currents are balanced and decrease the harmonic compensation of the full system. The Matlab simulations and test results show the THD, current and the voltage of the three photovoltaic inverter under T-S fuzzy controller method is current balancing efficiency. The control unit is capable of carrying out operation in good condition, dynamic characteristics stable and high quality.</p>
12
Foti, Salvatore, Antonio Testa, Salvatore De Caro, Luigi Danilo Tornello, Giacomo Scelba, and Mario Cacciato. "Multi-Level Multi-Input Converter for Hybrid Renewable Energy Generators." Energies 14, no. 6 (2021): 1764. http://dx.doi.org/10.3390/en14061764.
Full textAbstract:
A three-phase multi-level multi-input power converter topology is presented for grid-connected applications. It encompasses a three-phase transformer that is operated on the primary side in an open-end winding configuration. Thus, the primary winding is supplied on one side by a three-phase N-level neutral point clamped inverter and, on the other side, by an auxiliary two-level inverter. A key feature of the proposed approach is that the N-level inverter is able to perform independent management of N − 1 input power sources, thus avoiding the need for additional dc/dc power converters in hybrid multi-source systems. Moreover, it can manage an energy storage system connected to the dc-bus of the two-level inverter. The N-level inverter operates at a low switching frequency and can be equipped with very low on-state voltage drop Insulated-Gate Bipolar Transistor (IGBT) devices, while the auxiliary inverter is instead operated at low voltage according to a conventional high-frequency two-level Pulse Width Modulation (PWM) technique and can be equipped with very low on-state resistance Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) devices. Simulations and experimental results confirm the effectiveness of the proposed approach and its good performance in terms of grid current harmonic content and overall efficiency.
13
Barrero-González, Fermín, Carlos Roncero-Clemente, María Isabel Milanés-Montero, Eva González-Romera, Enrique Romero-Cadaval, and Oleksandr Husev. "Quasi-Z Source T-Type Power Converter for PV Based Commercial and Industrial Nanogrids with Active Functions Strategy." Electronics 9, no. 8 (2020): 1233. http://dx.doi.org/10.3390/electronics9081233.
Full textAbstract:
Since most power electronics used in photovoltaic (PV) inverters at commercial and industrial facilities exhibit behavior as non-linear loads from the grid side, these high-power demand installations are expected to have a major impact on the network’s power quality. In an attempt to facilitate their integration into the distribution grid, this paper presents a comprehensive control strategy for Quasi-Z Source T-Type PV inverters inside a facility, which performs active and reactive power control, and harmonic and imbalance compensation at expenses of the spare inverter power capacity. Unlike other approaches, the one proposed here operates properly under distorted and unbalanced grid voltages. The electrical network structure inside a commercial and industrial facility is considered, analyzing the operation of the proposed strategy on three-phase PV inverters. The power topology used has voltage boosting ability, which eliminates the requirement for both an additional DC-DC converter and/or a step-up transformer commonly used in PV inverter systems. The proposed strategy performance is demonstrated on a 50 kW converter model under a disturbed grid environment and changing load conditions.
14
Chen, Long Hu, Shao Lou Song, Xiao Ju Chen, and Jian Rong Zhao. "Modeling and Simulation of Three-Phase Two-Level Grid-Connected Photovoltaic System." Applied Mechanics and Materials 291-294 (February 2013): 181–87. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.181.
Full textAbstract:
The model and simulation of three-phase Two-level Grid-connected Photovoltaic System are established. According to the equivalent circuit and mathematical model of the PV cell, the general simulation model of photovoltaic array is established. Regulating duty ratio in Boost circuit to realize the maximum power point tracing with method of high-precision incremental conductance. Model of photovoltaic inverter is established based on power decoupling vector control strategy. SVPWM modulation improves the utilization ratio of voltage in DC side. Finally, the simulation of three-phase two-level grid-connected photovoltaic system is conducted in MATLAB. The result shows that the system can rapidly and accurately track maximum power point and the output of current keep in the same frequency and phase, which can be connected to power grid flexibly.
15
P, Saisrinivas, Surya Kalavathi. M, and Varunrohit V. "Power quality improvement of a PV and fuel cell connected microgrid." International Journal of Engineering & Technology 7, no. 2.12 (2018): 244. http://dx.doi.org/10.14419/ijet.v7i2.12.11290.
Full textAbstract:
Increasing demands of 21st century gain the need for sustainable energy. Non-conventional energy sources like solar, wind, fuel cell etc. are attaining much importance because of increasing environmental issues like Global Warming, Increase in Carbon foot prints etc. But, Non-conventional energy sources are not controllable. Hence, there is a need of sophisticated control of energies available to use them collectively. This can be made possible by the concept of Microgrid.This paper presents the work done on a typical grid connected Microgrid, with Solar and Fuel cell as non-conventional energy sources, using MATLAB (Simulink). A variable irradiance is considered for PV array designed with an MPPT based on Perturb & Observe Algorithm. A fuel cell stack with constant Hydrogen and air is considered. Here, the non-conventional energy sources are connected to Conventional grid. The variable DC obtained after Solar array is converted to three phase A.C by means of a three-phase inverter. The pulses for the inverter are generated by taking voltage and current both from grid side and PV side respectively as reference. Here, the control strategy to produce pulses for inverter is based on Phase locked loop (PLL) with a PI controller. One of the most important power quality indices like Total Harmonic Distortion (THD) is measured at various points and the power quality is improved by using a Cascaded LC filter.
16
Wang, Xiao Ming, Wan Ci Liu, and Wen Juan Xiao. "The Grid-Connected Inverter of Simulation on Direct-Drive Wind Power System Based on MATLAB." Advanced Materials Research 756-759 (September 2013): 4166–70. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4166.
Full textAbstract:
Based on working Principle of the direct-drive wind power systems grid-connected inverter was research, the mathematical model for inverter in Three-phase rotating coordinate was established and analyzed. A double-loop control strategy that based on feed forward decoupling were introduced, Meanwhile, combining the implementation effective control of the AC-side output current by the Space Vector Pulse Width Modulation method (SVPWM), it could generate sine wave current that had the same frequency and the same phase with network voltage. To a great degree, reduced harmonic pollution in power system, moreover, improved the Grid-connected wind power systems efficiency and reliability.
17
BERBOUCHA, Ali, Kamel DJERMOUNI, Kaci GHEDAMSI, and Djamel AOUZELLAG. "Fuzzy Logic Control of Wind Turbine Storage System Connected to the Grid Using Multilevel Inverter." International Journal of Energetica 2, no. 1 (2017): 15. http://dx.doi.org/10.47238/ijeca.v2i1.15.
Full textAbstract:
This paper aimed to evaluate the use of wind turbine storage systems to provide electricity in the electrical grid through a five-level inverter. The proposed system is composed of four wind turbine generators based on permanent magnet synchronous generator (PMSG), four battery storage systems connected to each capacitor of the DC link and a five level diode clamped inverter connected to the grid by three phase transformer. The control algorithm proposed is based on fuzzy logic to tracks and extract the maximum wind power by controlling the rotational speed of wind turbine, which is most appropriate when there is a lack of information on the characteristic Cp (λ,β) of the turbine. The system operator controls the power production of the four wind turbine generators by sending out reference power signals to each input side regulation unit, the input side regulation units regulate the voltage of each capacitor of the DC link, regulate the voltage and the state of charge of each battery storage system. The inverter is controlled by simplified space vector modulation which allows us to reduce the computational time and reduce the algorithm complexity compared to the conventional five levels space vector modulation, the grid side control level regulate the power and the current injected to the grid.
18
Wang, Feng, Shu Yun Qiao, and Xu Long Zhang. "Study of Hoist Control System Based on Dual Three-Level Inverter." Applied Mechanics and Materials 577 (July 2014): 368–71. http://dx.doi.org/10.4028/www.scientific.net/amm.577.368.
Full textAbstract:
The double-fed control strategy for AC hoist motor is discussed in this paper. The AC/DC/AC power converter is adopted as main circuit. Three-phase neutral-point-clamped three-level rectifier is used as AC/DC link to realize unity power factor at grid-side, which reduces harmonic distortions. For the DC/AC inverter, three-level topology is used, which is controlled by stator-flux oriented vector control method. Meanwhile, energy flows in bidirectional way by back to back three-level power converter. The hoist motor control system obtains a high dynamic performance when stator side operating in unity power factor condition. The reliability and safety of hoist system is improved based on double PLC. The control system mentioned in this paper is being used to control a shaft hoist with a capacity of 260kW, and the power saving is remarkable.
19
Wang, Xian-Bo, Zhi-Xin Yang, and Jun-Xiao Wang. "A ripple-based maximum power point tracking method for three-phase grid-connected photovoltaic inverter." Transactions of the Institute of Measurement and Control 40, no. 2 (2016): 615–29. http://dx.doi.org/10.1177/0142331216667544.
Full textAbstract:
As a prevailing solar energy utilization equipment, the three-phase grid-connected photovoltaic (PV) inverter is widely operated in partially shaded conditions and thus tends to generate multiple local maximum power points on its power-to-voltage and current-to-voltage characteristic curves. In order to identify the global maximum power point (GMPP) quickly and precisely, this paper proposes a ripple-based maximum power point tracking method. It aims to perform the optimization of tracking using the segmented scanning of DC-side voltage. An improved adaptive perturb and observe (AP&O) method is introduced to maximize the solar conversion and to increase working stability. This method applies a hybrid model of fixed and variable step-size perturbation to restrain the fluctuation of PV-side voltage. It belongs to a two-stage GMPP tracking method. That is, when environmental factors such as irradiance and temperature change quickly PV power fluctuates sharply. Correspondingly, the AP&O method tracks the latest maximum power point (MPP) with a large fixed-step voltage reference command. When the PV power fluctuates smoothly under a slow environmental change rate, the algorithm applies multiple small and variable step-size voltage perturbations to vibrate round the location of GMPP. Simulation and experimental results show that this method improves the efficiency of the PV inverter tracking performance. In addition, the stability of DC bus voltage is guaranteed, and the operational stability of the photovoltaic power generation system is improved.
20
Colussi, Jacopo, Alessandro La Ganga, Roberto Re, Paolo Guglielmi, and Eric Armando. "100 kW Three-Phase Wireless Charger for EV: Experimental Validation Adopting Opposition Method." Energies 14, no. 8 (2021): 2113. http://dx.doi.org/10.3390/en14082113.
Full textAbstract:
This paper presents the experimental validation, using the opposition method, of a high-power three-phase Wireless-Power-Transfer (WPT) system for automotive applications. The system under test consists of three coils with circular sector shape overlapped to minimize the mutual cross-coupling, a three-phase inverter at primary side and a three-phase rectifier at receiver side. In fact thanks to the delta configuration used to connect the coils of the electromagnetic structure, a three-phase Silicon Carbide (SiC) inverter is driving the transmitter side. The resonance tank capacitors are placed outside of the delta configuration reducing in this way their voltage sizing. This WPT system is used as a 100 kW–85 kHz ultrafast battery charger for light delivery vehicle directly supplied by the power grid of tramways. The adopted test-bench for the WPT charger consists of adding circulating boost converter to the system under test to perform the opposition method technique. The experimental results prove the effectiveness of the proposed structure together with the validation of fully exploited simulation analysis. This is demonstrated by transferring 100 kW with more than 94% DC-to-DC efficiency over 50 mm air gap in aligned conditions. Furthermore, testing of Zero-Current and Zero-Voltage commutations are performed to test the performance of SiC technology employed.
21
Chen, Xiaotao, Weimin Wu, Ning Gao, Jiahao Liu, Henry Shu-Hung Chung, and Frede Blaabjerg. "Finite Control Set Model Predictive Control for an LCL-Filtered Grid-Tied Inverter with Full Status Estimations under Unbalanced Grid Voltage." Energies 12, no. 14 (2019): 2691. http://dx.doi.org/10.3390/en12142691.
Full textAbstract:
This paper proposes a novel finite control set model predictive control (FCS-MPC) strategy with merely grid-injected current sensors for an inductance-capacitance-inductance (LCL)-filtered grid-tied inverter, which can obtain a sinusoidal grid-injected current whether three-phase grid voltages are balanced or not. Compared with the conventional FCS-MPC method, four compositions are added in the proposed FCS-MPC algorithm, where the grid voltage observer (GVO) and Luenberger observer are combined together to achieve full status estimations (including grid voltage, capacitor voltage, inverter-side current, and grid-injected current), while the sequence extractor and the reference generator are applied to eliminate the double frequency ripples of the active or reactive power, or the negative sequence component (NSC) of the grid-injected current caused by the unbalanced grid voltage. Simulation model and experimental platform are established to verify the effectiveness of the proposed FCS-MPC strategy, with full status estimations under both balanced and unbalanced grid voltage conditions.
22
Ye, Fei, Zhong Dong Yin, and Chen Xin Dai. "Research of Wind Power into the Grid Based on Large-Capacity Parallel Converter Modules." Advanced Materials Research 383-390 (November 2011): 5899–906. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5899.
Full textAbstract:
The converters connected to the power grid, including rectifier and inverter. The rectifier uses DC voltage outer loop control method and the input current inner loop control method, three-phase inverter output current uses SPWM modulation. With the capacity of the system increasing, the capacity of a single converter can no longer meet the requirements, for improving the system's power grid, reliability and efficiency, converters can be paralleled. Parallel operation generates loop current; one of the effective methods of suppressing the loop current is to connect limiting inductance in the inverter AC side. Through simulation, gets the suitable inductance value, and researches the dead zone time affecting on the loop current. When the dead zone times of two modules are not equal, the loop current increases.
23
Liu, Xian Xing, and Rui Wang. "Improvement of DPC of Grid-Connected Inverter for Wind Power System." Applied Mechanics and Materials 220-223 (November 2012): 635–38. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.635.
Full textAbstract:
This paper analyzes the principle and properties of the traditional direct power control (DPC) system for the three-phase grid-connected voltage source inverter based on its mathematical model. Hysteresis comparators in power loop of DPC control system, leading to the switching frequency not fixed .the fluctuation of power and DC voltage in temporary state. This paper brought an improved program. The active and reactive powers are calculate by estimating the virtual flux. The AC side voltage sensors could be replaced. The SVPWM has been utilized instead of the power hysteresis and switching table of the traditional DPC system.
24
Wang, Pan, Xi Guo, Jian Hua Yu, Fei Liu, and Xiao Ming Zha. "Research on the Topology and Control Policy of Composite Energy Feedback Cascaded Multi-Level Inverter." Advanced Materials Research 898 (February 2014): 648–52. http://dx.doi.org/10.4028/www.scientific.net/amr.898.648.
Full textAbstract:
Traditional uncontrolled or phase controlled cascade multilevel inverter only can realize one-direction transmission of energy. This paper presents a complex energy feedback cascade inverter topology with full-controlled, phase controlled Power units and its control strategy. For the full-controlled units, use PWM converter to replace the traditional rectifier bridge, and then combine with H-bridge inverter, the two-direction inverter is realized. The others remain phase controlled structure. According to the pump-up voltage in the energy feedback process ,a new method using the output side DC voltage closed loop control is proposed to prevent DC voltage shock and make all energy feedback to grid .Then it was verified in a cascade inverter with five units in which only three units are full-controlled. This inverter has the merits that it can automatic realize two-way flow of energy, the input currents approximate sine, the DC voltages control stability, the output voltage waveform is good and the phase shifting transformer structure is also simplified, etc. Simulation showed its feasibility and effectiveness.
25
Schulze, Wolf, Maurizio Zajadatz, Michael Suriyah, and Thomas Leibfried. "Emulation of grid-forming inverters using real-time PC and 4-quadrant voltage amplifier." Forschung im Ingenieurwesen 85, no. 2 (2021): 425–30. http://dx.doi.org/10.1007/s10010-021-00484-9.
Full textAbstract:
AbstractA test bed for the evaluation of novel control methods of inverters for renewable power generation is presented. The behavior of grid-following and grid-forming control in a test scenario is studied and compared.Using a real-time capable control platform with a cycle time of 50 µs, control methods developed with Matlab/Simulink can be implemented. For simplicity, a three-phase 4‑quadrant voltage amplifier is used instead of an inverter. Thus, the use of modulation and switched power semiconductors can be avoided. In order to show a realistic behavior of a grid-side filter, passive components can be automatically connected as L‑, LC- or LCL-filter. The test bed has a nominal active power of 43.6 kW and a nominal voltage of 400 V.As state-of-the-art grid-following control method, a current control in the d/q-system is implemented in the test bed. A virtual synchronous machine, the Synchronverter, is used as grid-forming control method. In combination with a frequency-variable grid emulation, the behavior of both control methods is studied in the event of a load connection in an island grid environment.
26
Gorai, Soumen, Sattianadan D, V. Shanmugasundaram, S. Vidyasagar, G. R. Prudhvi Kumar, and M. Sudhakaran. "Investigation of voltage regulation in grid–connected PV system." Indonesian Journal of Electrical Engineering and Computer Science 19, no. 3 (2020): 1131. http://dx.doi.org/10.11591/ijeecs.v19.i3.pp1131-1139.
Full textAbstract:
<p>In the present scenario the power demand on the load side is increasing day by day, so to balance the power demand and power supply various renewable energy comes to picture as the additional source of electricity generation. The power generated by various renewable resources such as solar, wind, tidal energy and geothermal sources is environmentally clean and have a less emission impact. Out of which PV system draws more attention because it generates energy with a much lower level of carbon dioxide emissions. In the proposed work the objective is to investigate the synchronisation of the grid-connected PV system in terms of voltage and frequency. It includes the P-V characteristics under the circumstances of MPPT technique such as perturb &amp; observe (P&amp;O) method can able to track the local maximum point. The proposed inverter is a voltage source H-Bridge inverter which is controlled using a Clarke and Park transformation to drive a controlled current into the grid to maintain the THD value within the standards. As the grid frequency is fluctuating between SRF-PLL is generally used to fix the output frequency and phase of the grid. It also includes with the design of a three-phase H-bridge inverter as an interface between PV system and grid system. The proposed work is designed and simulated in MATLAB SIMULINK 2017b environment.</p>
27
Rajakumar, P., and R. Saravanakumar. "Design of Fuzzy Logic Controller for DSTATCOM." Advanced Materials Research 905 (April 2014): 401–5. http://dx.doi.org/10.4028/www.scientific.net/amr.905.401.
Full textAbstract:
DSTATCOM is used for recompense of reactive power and disturb caused by different loads in distribution system.To develop a DSTATCOM with battery energy source system and control of energy flow among the system components. Multilevel inverter is used in DSTATCOM for mitigating voltage sag at the load side. Hybrid multilevel inverter with fuzzy logic and minimised switches is presented. Voltage sags are generated by faults in the distribution feeder, with the three-phase 7-level hybrid multi level inverter for mitigating the voltage disturbances. Seven level hybrid inverter which is used for low energy PV source and high power grid connected applications by applying VMC converter. DCDC converters based on the tri-state switching unit and voltage multiplier cells. VMC converter having ability to maintain current and voltage of input source and it gets maximum level for grid applications. Improving the efficiency, by harmonic reduction in the power system and fast load compensation achieved by the combination of voltage multiplier cells and seven level multilevel inverter circuits with fuzzy control techniques. Then, computer simulation by means of the programMatlab/Simulink preliminarily verifies the usefulness of the proposed device.
28
Jiang, Ting, Jian Feng Jiang, and Xi Jun Yang. "Research on Multi-Stage Series-Connection High-Voltage High-Power Matrix Converter." Advanced Materials Research 347-353 (October 2011): 843–47. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.843.
Full textAbstract:
Charge storage is an important research topic in smart grid and distributed generation system, pumped storage as one of the most popular large-scale charge storage methods has attracted increasing attention. However, the motor generator of the pumped charge station has high input voltage and heavy load, so in order to get grid connected safely, being soft started by a high voltage converter is necessary. In the view of the existing high voltage high power converters, only the voltage source inverter Multi-stage Series-connection high voltage frequency converters are suitable for this application, and this paper gives analysis of such converters. Based on Carrier Wave Phase-Shifted modulation, this paper proposes a multi-stage Series-connection high voltage frequency converter with balanced output power of the step-down transformer’s secondary windings, in which a winding burdens three symmetry three-phase to single-phase MC outputs, and the same phase outputs of the MC are cascaded at the secondary side of the transformers, letting out one phase of high-voltage AC output. The circuit is consisted of a step-down industry frequency transformer at the network side, three-phase to single-phase MC arrays, a step-up high frequency transformer at the load side and filter components. The simulation result based on MATLAB/SIMULINK shows that the proposed multi-stage Series-connection high voltage frequency converter is feasible and low-cost.
29
Simo Fotso, Armel, Godpromesse Kenné, and Rostand Marc Douanla. "A Simple Flexible and Robust Control Strategy for Wind Energy Conversion Systems Connected to a Utility Grid." Journal of Control Science and Engineering 2019 (May 14, 2019): 1–23. http://dx.doi.org/10.1155/2019/5032694.
Full textAbstract:
This paper presents a simple and robust control strategy for a variable speed wind turbine conversion system using a squirrel-cage induction generator and a three-phase voltage source (AC/DC/AC) Pulse Width Modulation (PWM) converter connected to the utility grid through an LCL filter. The control strategy integrates for the generator side an adaptive radial basis function (RBF) neurosliding mode controller associated with the rotor flux oriented vector control which is used to regulate the turbine rotation speed, rotor flux, and the DC bus voltage. For the grid side, the inverter current and voltage regulation as well as the current injected into the grid are regulated by PI controllers for two modes of operation, namely, the stand-alone mode and grid connected mode. The main contribution of this article is the introduction of a new and simple control algorithm allowing automatic mode switching method based on wind speed. The proposed scheme is very efficient and can be easily implemented in practice. Simulation results illustrate the effectiveness and feasibility of the proposed algorithm.
30
Durairasan, M., and Divya Balasubramanian. "An efficient control strategy for optimal power flow management from a renewable energy source to a generalized three-phase microgrid system: A hybrid squirrel search algorithm with whale optimization algorithm approach." Transactions of the Institute of Measurement and Control 42, no. 11 (2020): 1960–76. http://dx.doi.org/10.1177/0142331220901628.
Full textAbstract:
This paper introduces a hybrid approach for power flow management (PFM) of the hybrid renewable energy source (HRES) connected microgrid (MG) system. Here, the proposed approach is the combination of both the squirrel search algorithm (SSA) with whale optimization algorithm (WOA) named as SSAWO. Here, the SSA is developing the control signals of the voltage source inverter subject to the difference of power exchange between the source side and load side. The multi-objective function is shaped by the grid required active and reactive power varieties generated based on the accessible source power. The WOA procedures guarantee to locate the online control signals by utilizing the parallel execution against the active and reactive power varieties. The proposed technique-based control model enhances the control parameters of the power controller in light of the power flow varieties. By using the proposed methodology, the PFM of the MG system is controlled based on the source side and load side parameters variations. In order to render the power demand by the grid, the present system is accountable for dominating the energy sources using, optimally, both renewable energy sources and energy storage devices. Finally, the proposed model is implemented in MATLAB/Simulink working platform and the execution equates with the existing techniques.
31
Rathaiah, M., P. Ram Kishore Kumar Reddy, and P. Sujatha. "Adaptive Fuzzy Controller Design for Solar And Wind Based Hybrid System." International Journal of Engineering & Technology 7, no. 2.24 (2018): 283. http://dx.doi.org/10.14419/ijet.v7i2.24.12065.
Full textAbstract:
Renewable Energy Resources plays an active role in standing against global warming and reduce the use of conventional energy sources. Hybrid systems formed by combining the renewable energy sources are efficient relatively. The intent of this paper is to furnish endurable power for frontier and far-off places with hybrid-system of architecture. The intended system embodying DFIG and solar PV based wind turbine. In solar systems, control mechanism is essential for improving the performance. This paper proposes a method of incremental conductance approach based MPPT Adaptive Fuzzy Logic Controller for grid connected PV system which is composed of a boost converter and a three phase inverter. Adaptive Fuzzy Logic Controller provides fast response and better %THD compared to Fuzzy and PI controllers. In solar system, MPPT will magnify solar output power value. The DFIG has two controllers Grid-Side Control (GSC) and Rotor-Side Control (RSC). The rated rotor speed and DC-link voltage are regulated by RSC and GSC through PI, Fuzzy Logic Controller and AFLC strategies. By using simulation studies performed by three control strategies, %THD analysis is carried out.
32
Mohamed, Shazly A., Mohamed A. Tolba, Ayman A. Eisa, and Ali M. El-Rifaie. "Comprehensive Modeling and Control of Grid-Connected Hybrid Energy Sources Using MPPT Controller." Energies 14, no. 16 (2021): 5142. http://dx.doi.org/10.3390/en14165142.
Full textAbstract:
Nuclear and renewables energies are the two variants for low-carbon energy and the evolving grid suggests possible synergies between them. Nuclear energy introduces supple operations based on power demand, while renewables such as PV and wind hybrid systems depend on the presence and strength of sunlight or wind. For grid stability, there is need to improve their performance in order to overcome the impact of this disadvantage. The paper is a step in this direction as it addresses a detailed comprehensive dynamic modeling and an efficient control of grid-connected energy sources such as PV or wind system to increase system reliability and to ensure the power quality and safe operation of critical demands. The behavior of the suggested hybrid system is tested at different climate circumstances such as variation of sun radiation and wind speed. The PV is equipped with a boost converter and a three-phase pulse width modulation (PWM) inverter. The wind energy comprises a doubly fed generator (DFIG) based on a variable-speed wind turbine. The two controllers’ rotor-side and grid-side converters of DFIG have the ability to generate and observe reactive power, to keep constant speed of the rotor and control the DC-link voltage. The proposed scheme was investigated using MATLAB software. The maximum power point tracking (MPPT) was used for two systems, PV and wind, in varying weather conditions. The simulation results prove that the voltage at the point of common coupling was constant. Furthermore, the injected current of the grid side was in sinusoidal form and was synchronized with grid side voltage. In addition, the injected power-to-utility grid was around power delivered by the hybrid PV and wind system.
33
Jalilzadeh, Tohid, Mehrdad Tarafdar Hagh, and Mehran Sabahi. "Analytical study and simulation of a transformer-less photovoltaic grid-connected inverter with a delta-type tri-direction clamping cell for leakage current elimination." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 2 (2018): 814–31. http://dx.doi.org/10.1108/compel-03-2017-0114.
Full textAbstract:
PurposeThis paper aims to propose a new transformer-less inverter structure to reduce the common-mode leakage current in grid-connected photovoltaic (PV) systems. Design/methodology/approachThe proposed circuit structure is the same as the conventional full-bridge inverter with three additional power switches in a triangular structure. These three power switches are between the bridge and the output filter, and they mitigate the common-mode leakage current flowing toward the PV panels’ capacitors. The common-mode leakage current mitigation is done through the three-direction clamping cell (TDCC) concept. By clamping the common-mode voltage to the middle voltage of the DC-link capacitors, the leakage current and the total harmonic distortion (THD) of the injected current to the grid is effectively reduced. Therefore, the efficiency is improved. FindingsThe switching modes and the control method are introduced. A comparison is carried out between the proposed structure and other solutions in the literature. The proposed topology and its respective control method are simulated by PSCAD/EMTDC software. The simulation results validate the advantages of the presented structure such as clamping the common-mode voltage and reducing leakage current and THD of injected current to the grid. Originality/valuePresenting a single phase-improved inverter structure with low-leakage current for grid-connected PV power systems represents a significant original contribution to this work. The proposed structure can inject a sinusoidal current with low THD to the AC grid, and the power factor is unity on the AC side. In the half positive cycle, one of the switches in the TDCC is turned off under zero current. Besides, one of the other switches in TDCC is turned on with zero voltage and, therefore, its turn-on switching losses are zero. The efficiency of the proposed topology is high because of the reduction of leakage current and power losses. Accordingly, the presented topology can be a good solution to the leakage current elimination.
34
Mandrile, Fabio, Davide Cittanti, Vincenzo Mallemaci, and Radu Bojoi. "Electric Vehicle Ultra-Fast Battery Chargers: A Boost for Power System Stability?" World Electric Vehicle Journal 12, no. 1 (2021): 16. http://dx.doi.org/10.3390/wevj12010016.
Full textAbstract:
As a consequence of the exponential growth of the electric vehicle (EV) market, DC fast-charging infrastructure is being rapidly deployed all around the world. Ultra-fast charging (UFC) stations are starting to pose serious challenges to the electric power system operation, mostly due to their high peak power demand and unregulated discontinuous operation. To address these issues, local energy storage can be installed, ensuring a smoother grid power absorption profile and allowing to provide grid-supporting features. In this work, a control solution for the grid-side AC/DC converter of next-generation EV UFC stations is proposed. A virtual synchronous compensator (VSC) control algorithm is implemented, in order to lessen the impact of the charging station on the utility and to provide the full spectrum of grid ancillary services (i.e., frequency regulation, reactive power compensation, harmonic reduction, short circuit current generation, etc.). The proposed control strategy is verified experimentally on a downscaled 15 kVA three-phase inverter, emulating the grid front-end of the charging station.
35
Ma, Youjie, Faqing Zhao, Xuesong Zhou, Mao Liu, and Bao Yang. "DC Side Bus Voltage Control of Wind Power Grid-Connected Inverter Based on Second-Order Linear Active Disturbance Rejection Control." Energies 12, no. 22 (2019): 4274. http://dx.doi.org/10.3390/en12224274.
Full textAbstract:
In order to improve the dynamic response speed and the steady-state performance of the DC side bus voltage of the wind power grid-connected inverter, a mathematical model of a typical three-phase voltage type PWM (Pulse Width Modulation, PWM) grid-connected inverter was established, and its traditional voltage-current double closed loop with proportional-integral control method was analyzed. Then a second-order linear active disturbance rejection controller that does not depend on system model information was designed to replace the traditional voltage outer loop proportional-integral controller, thus a new double closed-loop control structure was formed to control it. The frequency domain theory was used to analyze the convergence of the third-order linear extended state observer and the influence of the total disturbance on the performance of the third-order linear extended state observer. The parameter tuning scheme of the designed controller was given. Finally, the 1.5 MW direct-driven permanent magnet wind power generation system was built in the Matlab/Simulink software and the control effects of the two control modes under different working conditions are compared. The simulation results show that the control scheme designed in this paper is superior to the traditional proportional-integral controller which has good anti-interference characteristics and robustness. Especially it has a good stability effect on DC side bus voltage fluctuations.
36
Rathi, Kala, and N. Rathina Prabha. "Grid Interconnected Photo Voltaic System Using Shunt Active Filter for Power Quality Improvement." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 1 (2018): 365. http://dx.doi.org/10.11591/ijpeds.v9.i1.pp365-376.
Full textAbstract:
Now-a-days, power generation and utilization became more complicated which further affects the economy of a country. The available non-renewable energy sources that supply the demanded power do not consider environmental challenges like global warming and pollution. This leads to the development of power generation based on Renewable Energy Resources (RES). These RES are connected to the grid through power electronic converters which offer countless power quality issues that must be rectified to deliver a quality power to the end users. The proposed work uses a three phase Voltage Source Inverter (VSI) based Shunt Active Power Filter (SAPF) fed by solar Photo Voltaic (PV) system to eliminate current harmonics at the source side of the grid. The output of the PV system is given to a boost converter along with self–lift single-ended primary-inductor converter (SEPIC) for supplying high voltage gain which is accompanied by a Perturb &amp; Observe Maximum Power Point Tracking (MPPT).The main objective of this paper is to eliminate the current harmonics at the grid side using SAPF. Also, the proposed SAPF is used for exporting the power generated from PV to the grid. The overall system performance is validated with a help of MATLAB/SIMULINK.
37
Zouga, Salma, Mohamed Benchagra, and Abdallah Ailane. "A robust nonlinear control strategy of a PV System connected to the three-phase grid based on backstepping and PSO technique." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 1 (2021): 612. http://dx.doi.org/10.11591/ijpeds.v12.i1.pp612-626.
Full textAbstract:
This article presents a robust non-linear control technique of the three-phase photovoltaic system. The structure chosen for this PV system is that of two power converters and DC voltage intermediate bus. The two power converters are: the DC-DC converter and the three-phase inverter, which requires two main controllers. These controllers have three main objectives. The first objective is to impose the PV voltage generated by the photovoltaic panel, in order to follow a maximum reference voltage provided by the MPPT block. The second one is to maintain the DC link voltage to a constant value, in order to optimize the transfer of energy between the two power converters. The last objective is to inject a three-phase sinusoidal current into the grid, while respecting a unit power factor. With the intention to achieve these three objectives, we designed cascading nonlinear controllers by using the technique of non-linear backstepping control in the synthesis of these two controllers, based on the Lyapunov function, with regard to maximise the PVG output voltage, in order to have a unitary power factor at the grid side. In order to regulate DC-link voltage, we developed an integral proportional controller (PI) with parameters that are optimized by the Particle Swarm Optimization (PSO) method. The robustness of the controller designed approach is tested by a simulation in MATLAB/Simulink software, that improves the performances of each controller whatever conditions of climate.
38
Boudali, Abdelkader, Karim Negadi, Sarah Bouradi, Abderrahmane Berkani, and Fabrizio Marignetti. "Design of Nonlinear Backstepping Control Strategy of PMSG for Hydropower Plant Power Generation." Journal Européen des Systèmes Automatisés 54, no. 1 (2021): 1–8. http://dx.doi.org/10.18280/jesa.540101.
Full textAbstract:
In this paper, renewable hydropower plant generators with permanent magnet synchronous generator are coupled via a diode bridge rectifier - DC/DC boost converter and three-phase inverter to a power grid. This paper studies a new control structure focused a backstepping control of the energy generation system.The proposed methods for adjusting the active and reactive power by adjusting the currents, the DC bus voltage on the main side converter, as well as the voltage at the output of the DC-DC boost converter. The main objective of this control is to obtain purely sinusoidal and symmetrical grid current signals, to suppress oscillations in reactive power and to cancel active power chattering in the event of grid imbalance. In order to optimize the energy flow in the different parts of the production process, an energy control algorithm is developed in order to attenuate the fluctuations in the water flow, the grid system of the hydropower plant considered has been implemented in Matlab/Simulink, the results show the effectiveness of the proposed method. To analyze our approach, a prototype is modeled, simulated and can be performed in an experimental test setup.
39
Jauhari, Moh, Dedet Candra Riawan, and Mochamad Ashari. "Control Design For Shunt Active Power Filter Based On p-q Theory In Photovoltaic Grid-Connected System." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 3 (2018): 1064. http://dx.doi.org/10.11591/ijpeds.v9.i3.pp1064-1071.
Full textAbstract:
<span>This paper presents the control for Shunt Active Power (SAPF) filter in photovoltaic (PV) systems connected to the grid. The proposed configuration of the system consists of a photovoltaic array that connected to the grid through the three-phase inverter topology that also serves as an active filter. Photovoltaic is coupled in parallel with the direct curret (DC) side of the active filter. With this configuration, can be obtained three advantages, namely the elimination of harmonic currents caused by nonlinear load, reactive power injection, and injection of active power generated photovoltaic. The p-q Theory is used to calculate the harmonic reference current to be used to control the active filter coupled fotovoltaic in generating anti-harmonic currents. The results show that system can reduce harmonic distortion from THD </span><span>27.22% </span><span>to be THD 1.05%, whereas when the active power from photovoltaic injected, the THD become 2.01%. Power sharing can also be seen from this study.</span>
40
El-Sharawy, Karim M., Hatem Y. Diab, Mahmoud O. Abdelsalam, and Mostafa I. Marei. "A Unified Control Strategy of Distributed Generation for Grid-Connected and Islanded Operation Conditions Using an Artificial Neural Network." Sustainability 13, no. 11 (2021): 6388. http://dx.doi.org/10.3390/su13116388.
Full textAbstract:
This article presents a control strategy that enables both islanded and grid-tied operations of a three-phase inverter in distributed generation. This distributed generation (DG) is based on a dramatically evolved direct current (DC) source. A unified control strategy is introduced to operate the interface in either the isolated or grid-connected modes. The proposed control system is based on the instantaneous tracking of the active power flow in order to achieve current control in the grid-connected mode and retain the stability of the frequency using phase-locked loop (PLL) circuits at the point of common coupling (PCC), in addition to managing the reactive power supplied to the grid. On the other side, the proposed control system is also based on the instantaneous tracking of the voltage to achieve the voltage control in the standalone mode and retain the stability of the frequency by using another circuit including a special equation (wt = 2πft, f = 50 Hz). This utilization provides the ability to obtain voltage stability across the critical load. One benefit of the proposed control strategy is that the design of the controller remains unconverted for other operating conditions. The simulation results are added to evaluate the performance of the proposed control technology using a different method; the first method used basic proportional integration (PI) controllers, and the second method used adaptive proportional integration (PI) controllers, i.e., an Artificial Neural Network (ANN).
41
Azoug, Hakim, Hocine Belmili, and Fekkak Bouazza. "Grid-connected control of PV-Wind hybrid energy system." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 2 (2021): 1228. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp1228-1238.
Full textAbstract:
ABSTRACT Article history: Received Oct 14, 2020 Revised Mar 22, 2021 Accepted Apr 23, 2021 This paper presented a strategy for modeling, simulation and control of a hybrid grid connected power system which is in fact a rather complex system. In this work, we study how to use two renewable energies in an efficient manner without any disturbing of the main network. Our hybrid energy system (HES) is composed by two renewable energy sources, the photovoltaic source and wind source. It is better for these two systems to work at their maximum power in order to return the investment cost of the system. The proposed solution is to connect those generators to the electrical grid via the AC bus with trackers. Where the photovoltaic generator (PVG) is followed by a DC/DC boost converter, controlled by a perturb and observe (P&amp;O) tracker, then followed by a three-phase voltage inverter (3-ph-VSI) which is controlled by the watt-var decoupled method. The wind system is based on permanent magnet synchronous machine (PMSM) which is used as a variable speed generator and directly connected to the turbine (without gearbox) followed by back-to-back converters. The grid side converter (GSC) allows us to control the DC bus voltage and unity power factor, while the machine side converter (MSC) ensures us to control the PMSM speed. Knowing that pitch angle control is not considered in our study. The MPPT control strategy, which is based on the optimum peak speed ratio (OTSR), is used to ensure the most energy efficiency despite variations in wind speed. The coupling of the two systems is done via the Point of Common Collecting (PCC). Finally, simulation results show the feasibility of our solution and the good performances of the proposed control strategy, applied for mediumsized HES in power generation. They also demonstrate that such system topology is very advantageous.
42
Wu, Si, Mingli Wu, and Yi Wang. "A Novel Co-Phase Power-Supply System Based on Modular Multilevel Converter for High-Speed Railway AT Traction Power-Supply System." Energies 14, no. 1 (2021): 253. http://dx.doi.org/10.3390/en14010253.
Full textAbstract:
The existing problems of the traction power-supply system (i.e., the existence of the neutral section and the power quality problems) limit the development of railways, especially high-speed railways, which are developing rapidly worldwide. The existence of the neutral section leads to the speed loss and traction loss as well as mechanical failures, all of which threaten the fast and safe operation of the train and the system. Meanwhile, the power quality problems (e.g., the negative sequence current, the reactive power, and the harmonic) can bring a series of problems that cannot be ignored on the three-phase grid side. In response, many researchers have proposed co-phase power-supply schemes to solve these two problems simultaneously. Given that the auto-transformer (AT) power-supply mode has become the main power-supply mode for the high-speed railway traction power-supply system, it has a bright future following the rapid development of the high-speed railway. In addition, there is no co-phase power-supply scheme designed for AT power-supply mode in the existing schemes. Therefore, the main contribution of this paper is to propose a specifically designed power-supply mode more suitable for the AT, as well as to establish the control systems for the rectifier side and the inverter side. In addition, for the proposed scheme, the operation principle is analyzed, the mathematical model is built, and the control system is created, and its functionality is verified by simulation, and its advantages are compared and summarized finally. The result proves that it can meet functional requirements. At the same time, compared with the existing co-phase power-supply scheme, it saves an auto-transformer in terms of topology, reduces the current stress by 10.9% in terms of the current stress of the switching device, and reduces the power loss by 0.25% in terms of the entire system power loss, which will result in a larger amount of electricity being saved. All of this makes it a more suitable co-phase power-supply scheme for the AT power-supply mode.
43
Li, Rui, Zhiyuan Ma, and Dehong Xu. "A ZVS Grid-Connected Three-Phase Inverter." IEEE Transactions on Power Electronics 27, no. 8 (2012): 3595–604. http://dx.doi.org/10.1109/tpel.2012.2184559.
Full text
44
Chen, Yang, and Keyue Smedley. "Three-Phase Boost-Type Grid-Connected Inverter." IEEE Transactions on Power Electronics 23, no. 5 (2008): 2301–9. http://dx.doi.org/10.1109/tpel.2008.2003025.
Full text
45
Rehman, Atiq, Chunyi Guo, and Chengyong Zhao. "Coordinated Control for Operating Characteristics Improvement of UHVDC Transmission Systems under Hierarchical Connection Scheme with STATCOM." Energies 12, no. 5 (2019): 945. http://dx.doi.org/10.3390/en12050945.
Full textAbstract:
Ultra-high voltage direct current (UHVDC) systems under hierarchical connection schemes (HCSs) linked to AC grids with different voltage levels (500 and 1000 kV) have been a great concern for power utilities to transfer bulk power. They have some operating issues like cascaded commutation failures and longer fault recovery time under certain fault conditions. Since STATCOM has the ability to effectively regulate AC busbar voltages, thus it is considered in this paper to improve the operating characteristics of UHVDC-HCS systems. To further improve the operating characteristics, a coordinated control between an UHVDC-HCS system and STATCOM is presented. To validate the effectiveness of coordinated control, the comparison between different control modes such as reactive power control (Q-control) and voltage control (V-control) in the outer loop control of STATCOM are conducted in detail. Various indices like commutation failure immunity index (CFII) and commutation failure probability index (CFPI) are also comprehensively evaluated in order to investigate robustness of the adopted coordinated control. An UHVDC-HCS system with multiple STATCOMs on the inverter side (500 kV bus) is developed in PSCAD/EMTDC. The impact of coordinated control on commutation failure phenomena and fault recovery time during single and three phase AC faults is analyzed. The analysis shows that coordinated control with V-control mode of STATCOM exhibits better performance in enhancing the operating characteristics of UHVDC-HCS system by improving the CFII, effectively reducing the CFPI and fault recovery time under various AC faults.
46
Zhou, Xiao Jie, and Yi Ruan. "Research on Two-Stage Three-Phase Photovoltaic Grid-Connected System." Advanced Materials Research 535-537 (June 2012): 1247–51. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1247.
Full textAbstract:
Nowadays the penetration of PV-generated power energy into the utility grid is increasing exponentially. This paper focuses on two-stage three-phase grid-connected PV systems, which includes modeling of three-phase grid-connected PV systems, grid-connected control strategy of inverter. The inverter based on the grid-voltage oriented vector control used SVPWM-based synchronous current vector PI controllers to control the grid-current of the common point in three-phase grid-connected system. Theoretic analysis and experimental results on a 2.5KW prototype verify the presented algorithm.
47
Tang, Wu Wu, Liang Liang Chen, Hong Xu Yin, and Hao Dong. "Design and Implementation of 30kW Three-Phase PV Grid-Connected Inverter." Applied Mechanics and Materials 241-244 (December 2012): 636–40. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.636.
Full textAbstract:
This paper developed a mathematical model of three-phase PV grid-connected inverter, and studied the grid-connected current control method based on PI control in synchronous rotating reference frame. Simulation and experimental results from the prototype of 30kW three-phase PV grid-connected inverter proved the correctness and the feasibility of the control strategy, and this grid-connected inverter can operate at the unity power factor state with a nice dynamic performance, and the output current has high sinusoidal and low harmonic content as well as good symmetry.
48
Qi, Chun Qing, Yi Ruan, and Feng Wen Cao. "Research on Control Strategy for the Three-Phase Grid-Connected Inverter." Advanced Materials Research 614-615 (December 2012): 1578–82. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1578.
Full textAbstract:
This paper proposes a control strategy，based on the grid voltage oriented vector control (VOC), which makes three-phase inverter control the active and reactive power of grid-connected inverter under the premise of the direct current control. This paper analyzes the principle of three phase photovoltaic grid connected inverter and describes the control structure of the inverter. The control strategy can overcome the deficiencies of the indirect current control scheme. This paper designs the current closed-loop control system, which not only improve the system dynamic response speed and output current waveform quality, while also reduce its sensitivity to parameter changes to improve the robustness of the system. The simulation results show the validity of control strategy proposed.
49
Zou, Xiaoming, Xiong Du, Guoning Wang, and Heng‐Ming Tai. "Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter." IET Power Electronics 12, no. 6 (2019): 1593–602. http://dx.doi.org/10.1049/iet-pel.2018.5856.
Full text
50
Isen, Evren, and Ahmet Faruk Bakan. "Development of 10 kW Three-Phase Grid Connected Inverter." Automatika 57, no. 2 (2016): 319–28. http://dx.doi.org/10.7305/automatika.2016.10.1081.
Full text