Journal articles: 'NPC Converter'

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Dybko, Maxim, Sergey Brovanov, and Hong Hee Lee. "Multilevel NPC Converters in Parallel Connection for Power Conditioning Systems." Applied Mechanics and Materials 792 (September 2015): 189–96. http://dx.doi.org/10.4028/www.scientific.net/amm.792.189.

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This paper investigates a multilevel combined NPC converter for medium-and high-power energy storage systems and active power filters. The proposed multilevel NPC converter is composed of a parallel connection of multiple NPC converters using the current sharing reactors and involves the phase shifted PWM strategy for better energy quality performance. Using the switching function-based mathematical model, the proposed multilevel converter is evaluated to show the energy quality performance and fault tolerance of an energy storage system or active power filter. In addition, the switching frequency of circulating currents is analyzed to obtain its relationship with the converter parameters and maximum sharing reactor current ripple. The performance of the proposed multilevel converter is verified by simulation.

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Mahaboob Basha, S., and M. Kannan. "Open switch fault detection technique of a back-to-back converter using NPC topology for turbine systems." International Journal of Engineering & Technology 7, no. 2.12 (April 3, 2018): 359. http://dx.doi.org/10.14419/ijet.v7i2.12.11351.

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Efficiency is turning into more and more necessary in power electronics. New applications are developed to reduce the consumption of en-ergy. Inverters that supply continuous quality power have vast use in solar energy based applications. For a Wind Turbine Generation sys-tem with neutral-point-clamped (NPC) topology in a back to back converter , good efficiency is provided when operated at high power. In NPC topology totally twelve switches are present. Input current distortion, torsion vibration and output current distortion is caused by open switch fault within NPC inverter and rectifier of the consecutive converter. Wind Turbine Generation systems will be erroneous due to such faults. Open-switch fault detection methodology is necessary for consecutive converters for enhancing the output of Wind Turbine Genera-tion systems. Our proposed work checks NPC rectifier and inverter for outer and inner open switch faults. Additionally for all the possible open-switch faults , a novel open-switch fault detection methodology within the back to back converter has been presented in this paper.

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Luqman, Muhammad, Gang Yao, Lidan Zhou, Tao Zhang, and Anil Lamichhane. "A Novel Hybrid Converter Proposed for Multi-MW Wind Generator for Offshore Applications." Energies 12, no. 21 (November 1, 2019): 4167. http://dx.doi.org/10.3390/en12214167.

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Modern multi-MW wind generators have used multi-level converter structures as well as parallel configuration of a back to back three-level neutral point clamped (3L-NPC) converters to reduce the voltage and current stress on the semiconductor devices. These configurations of converters for offshore wind energy conversion applications results in high cost, low power density, and complex control circuitry. Moreover, a large number of power devices being used by former topologies results in an expensive and inefficient system. In this paper, a novel bi-directional three-phase hybrid converter that is based on a parallel combination of 3L-NPC and ‘n’ number of Vienna rectifiers have been proposed for multi-MW offshore wind generator applications. In this novel configuration, total power equally distributes by sharing of total reference current in each parallel-connected generator side power converter, which ensures the lower current stress on the semiconductor devices. Newly proposed topology has less number of power devices compared to the conventional configuration of parallel 3L-NPC converters, which results in cost-effective, compact in size, simple control circuitry, and good performance of the system. Three-phase electric grid is considered as a generator source for implementation of a proposed converter. The control scheme for a directly connected three-phase source with a novel configuration of a hybrid converter has been applied to ratify the equal power distribution in each parallel-connected module with good power factor and low current distortion. A parallel combination of a 3L-NPC and 3L-Vienna rectifier with a three-phase electric grid source has been simulated while using MATLAB and then implemented it on hardware. The simulation and experimental results ratify the performance and effectiveness of the proposed system.

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Abronzini, Umberto, Ciro Attaianese, Matilde D’Arpino, Mauro Di Monaco, and Giuseppe Tomasso. "Induction Motor Drives Fed by an NPC Inverter with Unbalanced DC-Link." Electronics 8, no. 12 (November 21, 2019): 1379. http://dx.doi.org/10.3390/electronics8121379.

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Neutral Point Clamped (NPC) converters with n levels are traditionally controlled in such a way that the DC-link capacitors operate at 1/( n - 1) of the total DC-link voltage level. The voltage level across the DC-link capacitors has to be properly regulated by the capacitor unbalance control to contain the harmonic distortion of the converter output voltages. State-of-the-art modulation techniques address the problem of the DC-link voltage regulation for NPC inverters. However, they highly show reduced performance when unbalanced DC-link voltages are considered. In this paper, a novel Space Vector Modulation (SVM) is proposed for NPC converters with an unbalanced DC-link. At every modulation interval, the technique defines the optimal switching pattern by considering the actual unbalanced DC-link conditions. The proposed modulation allows improving the harmonic content of the NPC converter output voltage with respect to a traditional ML-SVM, when the same operating conditions are considered. As an extension, the proposed modulation technique will guarantee the same output voltage quality of a traditional ML-SVM with unbalanced DC-link, while improving the conversion efficiency thanks to a reduction of switching frequency.

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Ojha, Amit. "Design of Control System Using Online Tuning of PI Controllers for Three-Phase Active Front End Neutral Point Clamped Three-Level Converter." Journal Européen des Systèmes Automatisés 53, no. 6 (December 23, 2020): 869–82. http://dx.doi.org/10.18280/jesa.530613.

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In conventional DC link AC-AC converter system, uncontrolled front end converter has inherent problem of power quality. To overcome the problem associated with uncontrolled front end converter, multilevel front end converter will be good choice for high power applications. In the paper, unity power factor control system (UPC) for active front end (AFE) neutral point clamped (NPC) 3-level converter is presented. PI controllers are used in UPC and for tuning of PI controllers it is essentially required to know the different time constants with their gains exactly for evaluating the optimized controller parameters for steady operation of the NPC rectifier. In this paper a simplified and accurate method of online tuning of PI controllers in UPC is derived and implemented for three phase AFE NPC 3-level converter. Complete design procedure for the design of control system for AFE NPC 3-level is also presented in this paper. Based on developed model, simulations are carried in MATLAB/SIMULIK environment. Experimentation results confirm the simulation results.

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Yan, Tao, Zhan Zhan Qu, Xue Long Zhang, Dong Hui, Yun Jia Liu, Peng Fei Jia, Koba Yashi Shinichi, and Zhi Xiang Ye. "Research on Designation and Control System of A-NPC Three-Level Battery Power Storage Converter." Advanced Materials Research 860-863 (December 2013): 603–7. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.603.

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The three-level converter based on A-NPC topology can improve waveform quality of the output voltage, decrease the switch voltage and reduce the loss of the inductor, thus it has broad application prospects in the electrical power storage domain. This paper built the semi-physical real-time simulation platform of A-NPC three-level battery power storage system by designing the control system and the main circuit of the A-NPC topology converter, and researched the control mechanism of the power storage converter control algorithm with digital simulation platform. The experimental results of the prototype machine show that the A-NPC three-level battery power storage system built in this paper was fine, compared with the most common two-level topology, three-level converter has characteristics of lower output current waveform distortion factor, lower current harmonics and higher efficiency. Three-level converter used in the power storage system is able to gain access to low THD during steady-state operation and fine dynamic characteristics.

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Cao, Yonglei, Xiaodong Zhang, Xiang Liu, and Yuling Ma. "Study on Modulation Strategy of Electronic Converters Based on Improved D-NPC Topology for Full Electric Vehicle." World Electric Vehicle Journal 12, no. 2 (May 26, 2021): 80. http://dx.doi.org/10.3390/wevj12020080.

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The battery is the only power source of full electric vehicles, and the converter plays a key role in power and signal conversion; therefore, the stability and reliability of the converter determine the performance of the whole vehicle system. In order to improve the overall performance of the converter and optimize the function of the ID-NPC (improved diode neutral-point-clamped) topology with power allocation, the two-level topology is improved, and it is also a part of the ID-NPC topology. Based on the ID-NPC topology, the converter level can switch according to the proposed three-level and two-level modulation conversion strategies, which extends the fault-tolerant function of the converter. Finally, a simulation and experimental platform is built to verify the function of the improved topology and the feasibility of the proposed modulation strategy.

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Zheng, Hong, Yue Lei Shi, and Hang Hui Zhang. "Continuous PWM Modulation Strategy for NPC/H and H Bridge Hybrid Multilevel Converter." Advanced Materials Research 748 (August 2013): 510–13. http://dx.doi.org/10.4028/www.scientific.net/amr.748.510.

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f the ratio of NPC/H and H bridge hybrid multilevel converters DC supply voltage changed, the output voltage PWM waveform will be discontinuous. Thus an improved topology and control strategy is proposed. In new method, master converter operates at the fundamental frequency based on command voltage, slave converter adopts carrier phase shifted PWM technology (CPS-SPWM) at a higher frequency to enhance the quality of output voltage waveform. The amplitude of command voltage is higher than output voltage amplitude of the master converter at any time, to ensure that output voltage variation of both converters keeps in the same direction without any current flow backwards. Matlab simulation results demonstrate the effectiveness of the proposed control strategy and topology.

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Kim, Ju-Yong, Ho-Sung Kim, Ju-Won Baek, and Dong-Keun Jeong. "Analysis of Effective Three-Level Neutral Point Clamped Converter System for the Bipolar LVDC Distribution." Electronics 8, no. 6 (June 19, 2019): 691. http://dx.doi.org/10.3390/electronics8060691.

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Low-voltage direct current (LVDC) distribution has attracted attention due to increased DC loads, the popularization of electric vehicles, energy storage systems (ESS), and renewable energy sources such as photovoltaic (PV). This paper studies a ±750 V bipolar DC distribution system and applies a 3-level neutral-point clamped (NPC) AC/DC converter for LVDC distribution. However, the 3-level NPC converter is fundamental in the neutral-point (NP) imbalance problem. This paper discusses the NP balance control method using zero-sequence voltage among various solutions to solve NP imbalance. However, since the zero-sequence voltage for NP balance control is limited, the NP voltage cannot be controlled to be balanced when extreme load differences occur. To maintain microgrid stability with bipolar LVDC distribution, it is necessary to control the NP voltage balance, even in an imbalance of extreme load. In addition, due to the bipolar LVDC distribution, the pole where a short-circuit condition occurs limits the short current until the circuit breaker operates, and a pole without a short-circuit condition must supply a stable voltage. Since the conventional 3-level NPC AC/DC converter alone cannot satisfy both functions, an additional DC/DC converter is proposed, analyzed, and verified. This paper is about a 3-level NPC AC/DC converter system for LVDC distribution. It can be used for the imbalance and short-circuit condition in bipolar LVDC distribution through the prototype of the 300 kW 3-level NPC AC/DC converter system and experimented and verified in various conditions.

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Mlodzikowski, Pawel, Adam Milczarek, and Mariusz Malinowski. "Application of Simplified Neutral Point Clamped Multilevel Converter in a Small Wind Turbine." Electrical, Control and Communication Engineering 5, no. 1 (May 1, 2014): 5–10. http://dx.doi.org/10.2478/ecce-2014-0001.

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Abstract In low power distributed generation systems low cost together with the energy quality requirements are a key element. It is known that quality of voltage waveforms generated from multilevel converters is better in comparison with those from two-level. Due to advancements in power electronics and microcontrollers, multilevel converters are being built with the use of integrated power modules thus this type of converters are getting more compact in size. This paper investigates performance of a derivation from the most popular multilevel topology - a neutral point clamped converter (NPC). Applying the idea for simplifying the topology by reducing the number of switches (what came from drives) this NPC converter is capable of bidirectional AC/DC/AC operation. For the AC/DC part two schemes are tested: Direct Torque Control Space Vector Modulated and Field Oriented Control but for the DC/AC part a control scheme utilizing the proportional-resonant controller was chosen. Laboratory setup was based on a permanent magnet synchronous generator with control and acquisition completed with the help of dSpace 1005 control box. Experimental verification shows that system operates properly.

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11

Jing, Wei, and Ran Ding. "Loss Analysis of Three-Level Active Neutral Point Clamped Converter under Fault Tolerance Operation." Advanced Materials Research 588-589 (November 2012): 847–50. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.847.

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Compared with traditional three-level neutral-point-clamped (NPC) converter, the recently proposed three-level active NPC (ANPC) converter has the ability to overcome the unbalanced loss distribution, and therefore result in increased output power or switching frequency. In industrial applications, fault tolerance ability of power converters is very important considering system availability, safety and reliability. This paper introduced the control schemes to get stable and continuous output under single device fault for both open-circuit and short-circuit fault cases. By analyzing the phase relationship of reference voltage and load current, the loss calculation method under fault tolerant operation was proposed. Calculation results show that the devices junction temperatures under fault tolerant operation are within the safe operation area (SOA) even they are a little bit higher compared to normal operation, which also confirm the effectiveness of the fault tolerant control schemes.

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Ouerdani, Imen, Hafedh Ben Abdelghani, Afef Bennani Ben Abdelghani, Daniel Montesinos-Miracle, and Ilhem Slama-Belkhodja. "Space Vector Modulation Technique for 3-Level NPC Converter with Constant Switching Frequency." Advances in Power Electronics 2016 (July 14, 2016): 1–13. http://dx.doi.org/10.1155/2016/6478751.

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This paper presents a simple Space Vector Modulation (SVM) methodology for a three-level NPC converter. Nearest three vectors (NTV) and corresponding duty cycles are deduced through simple generic mathematical expressions. Extra degrees of freedom of NPC converter are used to fully benefit from SVM advantages and to control the switching frequency. Simulation and experimental results are presented and discussed to validate the proposed methodology.

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Mechouma, Rabiaa, and Boubekeur Azoui. "Multiple low frequency dual reference PWM control of a grid connected photovoltaic three phase NPC inverter with DC/DC boost converter." Serbian Journal of Electrical Engineering 11, no. 2 (2014): 315–37. http://dx.doi.org/10.2298/sjee1402315m.

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In recent years, power demand of industrial applications has increased significantly reaching some megawatts. The use of multilevel converters for applications of medium and high powers is proposed as a solution to drawback semiconductor technology. A multilevel converter not only achieves high power ratings, but also enables the use of renewable energy sources. Renewable energy sources such as photovoltaic can be easily interfaced to a multilevel converter system for a high power application. This paper presents the simulation study in Matlab/Simulink of a grid connected photovoltaic three phase Neutral Point Clamped (NPC) inverter with DC/DC boost converter for constant and variable solar radiation.

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Shan, Shi Min, Wei Chi Ou, and Ya Feng. "Decoupling Control Strategy for Conergy Three-Level Three Phase Grid Converter." Advanced Materials Research 986-987 (July 2014): 1205–9. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1205.

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Conergy three-level NPC topology is often used in grid connected inverter due to its high efficiency, fewer switching devices and better EMI performance. Traditional half-bridge topology can be transformed to Conergy NPC topology by adding bi-direction switches. This paper proposed a novel control strategy for Conergy three-level NPC three phase grid converter with real and reactive power closed-loop controller in the synchronous d-q rotating frame. The power control loop is based on the feed forward decoupling of d-axis and q-axis components of the output current, thus the active and reactive power can be controlled separately. Additionally a proportional-integral controller is added to enhance the robustness of the power controller. Simulation results verify the effectiveness of the proposed strategy.

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Lin, Hao, Jose I. Leon, Wensheng Luo, Abraham Marquez, Jianxing Liu, Sergio Vazquez, and L. G. Franquelo. "Integral Sliding-Mode Control-Based Direct Power Control for Three-Level NPC Converters." Energies 13, no. 1 (January 2, 2020): 227. http://dx.doi.org/10.3390/en13010227.

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Three-level neutral-point-clamped (NPC) converter is widely used in energy conversion systems due to its good properties for high-power systems presenting output waveforms with reduced harmonic distortion. To obtain better system performance, an integral sliding-mode control (ISMC)-based direct power control (DPC) strategy is proposed for NPC converters. The controller achieves three objectives. First, an extended state observer (ESO)-based ISMC strategy, to enforce the active and reactive power to their reference values, is applied in the power tracking loop. ESO is used to reduce the influence of parameter uncertainties. Next, in the voltage regulation loop, a radial basis function neural network (RBFNN)-based adaptive ISMC strategy is applied to regulate the DC-link voltage. RBFNN is used to estimate the load variation, which is considered as a disturbance, to improve the system disturbance rejection ability. An adaptive law is used in the controller to reduce the chattering of reference active power which can reduce the current harmonic distortion. Finally, a proportional-integral (PI) control strategy is applied in the voltage balancing loop to achieve voltage balance between two DC-link capacitors. Experimental results show the effectiveness and superiority of the proposed control strategy for the NPC power converter compared with PI-based DPC strategy.

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Barros, J. Dionísio, Luis Rocha, and J. Fernando Silva. "Backstepping Predictive Control of Hybrid Microgrids Interconnected by Neutral Point Clamped Converters." Electronics 10, no. 10 (May 19, 2021): 1210. http://dx.doi.org/10.3390/electronics10101210.

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In this work, DC and AC parts of hybrid microgrids are interconnected by a neutral point clamped—NPC converter controlled using a new backstepping predictive (BP) method. The NPC converter is controlled to operate in the DC microgrid voltage control mode or in the AC microgrid power control mode. The novel backstepping predictive controller is designed using the dq state space dynamic model of the NPC converter connected to the hybrid microgrid. The designed BP controller regulates the DC voltage or AC injected power, balances the capacitor voltages, controls the AC currents, and enforces the near unity power factor. Simulation (MATLAB/Simulink) and experimental (laboratory prototype) results show that the converter can regulate the DC voltage in the DC microgrid interconnection point, by adjusting the AC power conversion to compensate variations on the loads or on the distributed renewable energy sources in the DC microgrid. AC currents are sinusoidal with low harmonic distortion. The obtained BP controller is faster at balancing capacitor voltages than PWM (pulse width modulation) control with carrier offset. The fast AC power response allows the converter to be used as a primary frequency regulator of the AC microgrid. This research is appropriate for power and voltage control in hybrid microgrids with renewable energy.

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Domino, A., K. Zymmer, and M. Parchomiuk. "Selected converter topologies for interfacing energy storages with power grid." Bulletin of the Polish Academy of Sciences Technical Sciences 65, no. 5 (October 1, 2017): 579–88. http://dx.doi.org/10.1515/bpasts-2017-0063.

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Abstract The paper presents different solutions applicable in power converter systems for connecting power grids with energy storage systems such as superconducting magnetic energy storage (SMES), supercapacitor energy storage (SES) or chemical batteries. Those systems are characterized by bidirectional current flow between energy storage and power grid. Two-level converters (AC-DC and DC-AC converters) dedicated for low power energy storage compatible with 3×400 V-type power grids are proposed. High power systems are connected with 3×6 kV-type power grids via transformers that adjust voltage to the particular energy storage or directly, based on multilevel power converters (AC-DC and DC-AC) or dual active bridge (DAB) systems. Solutions ensuring power grid compatibility with several energy storage systems of the same electrical parameters as well as of different voltage-current characteristics are also proposed. Selected simulation results illustrating operation of two system topologies of 200 kW power for two-level converter and neutral point clamped (NPC) three-level converter are presented.

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Massaq, Zakaria, Abdelouahed Abounada, and Mohamed Ramzi. "Robust non-linear control of a hybrid water pumping system based on induction motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 4 (December 1, 2020): 1995. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp1995-2006.

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This contribution presents a non-linear control of a hybrid pumping system supplied with a photovoltaic generator and a battery. This system is employed for delivering a continuous volume of water whatever the climatic conditions. In the DC side, a boost converter is controlled with the indirect double integral sliding mode controller (DISMC) for maximum power point tracking (MPPT). The DISMC is suitable for MPPT because it gives a fast response and reduces the amplitude of power oscillations. Then, a bidirectional buck-boost converter is adopted to ensure the energy management between the battery and the DC-bus, and this converter is controlled with integral sliding mode control (ISMC) theory. The non-linear predictive control (NPC) is chosen to drive an induction motor (IM), the NPC is known by its fast dynamic and high capacity to reject disturbances. The hybrid system is modelled in MATLAB/Simulink software. During simulations, the DISMC-MPPT is compared with other techniques such as sliding mode controller (SMC) MPPT and integral SMC MPPT, the DISMC provides the best tracking performances under different irradiances. Moreover, the designed controller for the bidirectional converter regulates the DC-link voltage with better performances than the classical PI controller. Lastly, the NPC regulates the speed of the IM with high robustness.

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Lara, Jorge, Lesedi Masisi, Concepcion Hernandez, Marco A. Arjona, and Ambrish Chandra. "Novel Single-Phase Grid-Tied NPC Five-Level Converter with an Inherent DC-Link Voltage Balancing Strategy for Power Quality Improvement." Energies 14, no. 9 (May 5, 2021): 2644. http://dx.doi.org/10.3390/en14092644.

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This paper presents a novel single-phase grid-tied neutral-point-clamped (NPC) five-level converter (SPFLC). Unlike the literature on five-level NPC topologies, the proposed one is capable of inherently balancing the voltage of the DC-link split capacitors. For this purpose, a simple Multicarrier Phase Disposition (MPD) Pulse Width Modulation (PWM) technique is used, thus avoiding both complex modifications to the Space Vector Modulation (SVM) and offset voltage injections into the carrier based (CB) PWM, as commonly done in most conventional balancing algorithms. Bearing in mind that the proposed balancing strategy only requires measuring the capacitors’ voltages and the sign of the converter output current, it has a very low complexity. The developed strategy is not only straightforwardly implemented but is also very effective for obtaining symmetrical and undistorted voltage levels from the proposed multilevel converter, as well as for significantly improving the power quality of the SPFLC output voltage and, in turn, of the grid current. The simulation results obtained with MATLAB-SimPowerSystems as well as the experimental results obtained with the prototype built in the laboratory validate the topology of the proposed NPC five-level converter and the voltage balancing strategy, by showing a good performance under step-changes and exhaustive operating test conditions.

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Beriber, D., A. Talha, and M. Boucherit. "Stabilization of multi DC bus link voltages of multilevel NPC VSI. Application to double stator induction motors." Archives of Control Sciences 22, no. 1 (January 1, 2012): 107–20. http://dx.doi.org/10.2478/v10170-011-0015-1.

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Stabilization of multi DC bus link voltages of multilevel NPC VSI. Application to double stator induction motors Voltage source multilevel inverters have become very attractive for power industries in power electronics applications during last years. The main purposes of studying multilevel inverters are the generation of output voltage signals with low harmonic distortion and reduction of switching frequency. An important issue of the multilevel inverter is the capacitor voltage-balancing problem. The unbalance of different DC voltage sources of multilevel neutral point clamped (NPC) voltage source inverter (VSI) constitutes the major limitation for the use of this new power converter. In this paper, we present study on the stability problem of the input DC voltages of the three-level Neutral Point Clamping (NPC) voltage source inverter (VSI). This inverter is useful for application in high voltage and high power area. In the first part, we remind the model of double stator induction motors (DSIM). Then, we develop control models of this inverter using the connection functions of the semi-conductors. We propose a Pulse Width Modulation (PWM) strategy to control this converter. The inverter is fed by constant input DC voltages. In the last part, we study the stability problem of the input DC voltages of the inverter. A cascade constituted by two three-level PWM rectifiers - two three-level NPC VSI - DSIM is discussed. The results obtained show that the input DC voltages of the inverters are not stable. To solve this problem, we propose to use a half clamping bridge. This solution is very promising in order to stabilize the input DC voltages of this converters.

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A Divya Teja and Dr. N Sambasiva Rao. "Analysis of Three Phase 3-Level NPC Voltage Source Converter for AC-DC Conversion." International Journal for Modern Trends in Science and Technology 06, no. 09 (November 25, 2020): 144–48. http://dx.doi.org/10.46501/ijmtst060922.

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The use of power electronic converters influences the generation of harmonics and reactive power flow in power system. Therefore, three-phase multilevel improved power quality AC-DC converters are gaining lot of popularity in power conversion applications. This work deals with critical problem of multilevel structure i.e neutral point potential (NPP) variation. In this paper, a simplified current controlled scheme is presented to ensure unity power factor operation. Neutral point potential (NPP) of three-phase, 3-level NPC AC-DC converter is controlled by modifying control signal in the controller using NPP regulator. An auxiliary circuit is being presented in this paper as an alternative option for controlling the neutral point potential of the converter. Comparison has been carried out between these control techniques in terms of power quality. A complete mathematical model is presented for better understanding of both techniques used for NPP control. The presented control techniques has been verified through simulation investigations and validated

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Luqman, Muhammad, Gang Yao, Lidan Zhou, Di Yang, and Anil Lamichhane. "Study and Implementation of a Cost-Effective 3L-Active Rectifier for DC Collection in WECS." E3S Web of Conferences 118 (2019): 02065. http://dx.doi.org/10.1051/e3sconf/201911802065.

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Power electronic converters are widely used in wind energy conversion system (WECS) applications. Therefore, with the increasing manufacturing capacity of multi-MW wind generators, multi-level converters, or parallel configuration of converters are becoming more attractive solutions towards DC collection from the wind generator. Among the multilevel converters, three-level full-scale neutral point diode clamped (3L-NPC) converter are using extensively for such applications in order to reduce the voltage stress on the semiconductor devices. In this article, a comparative study based on several devices used by NPC, capacitor clamped (CC) as well as Vienna rectifier has been done. Furthermore, their estimated cost comparison and complexity of control switches have been debated. By keeping in view the merits and demerits of these rectifiers, a low cost three-level active rectifier having a smaller number of active switches with a simple control scheme have been implemented. Considering a three-phase electric grid as a generated source, a 2.2KW low-cost three-level Vienna rectifier is simulated using MATLAB/Simulink. DSP (TMS320F28335) based experimental results ratify the simulated circuit with THD<5%.

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de Souza, Victor Ramon França Bezerra, Luciano Sales Barros, and Flavio Bezerra Costa. "Modular Multilevel Converter for Low-Voltage Ride-Through Support in AC Networks." Energies 14, no. 17 (August 27, 2021): 5314. http://dx.doi.org/10.3390/en14175314.

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New grid-connected systems have imposed additional requirements regarding reliability, power quality, high levels of power processing capacity, and fault support, where power converters have a crucial role in fulfilling these requirements. Overcoming one of these challenges, this paper proposes a new alternative application to improve the low-voltage ride-through (LVRT) support based on the arm impedance employment of the modular multilevel converter (MMC) by attenuating the fault impacts, avoiding overcurrents and overvoltages. This proposal does not require additional hardware or control loops for LVRT support, only using PI controllers. This paper evaluates symmetrical and asymmetrical grid fault impacts on the converter DC side of four converter topologies: two-level voltage source converter topology (2L-VSC), neutral point clamped (NPC), MMC, and 2L-VSC equipped with a DC-chopper, employing the same control structure for the four topologies, highlighting that the MMC contributed better to LVRT improvement under severe grid conditions.

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Bruckner, T., S. Bernet, and H. Guldner. "The Active NPC Converter and Its Loss-Balancing Control." IEEE Transactions on Industrial Electronics 52, no. 3 (June 2005): 855–68. http://dx.doi.org/10.1109/tie.2005.847586.

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McNeill, Neville, Xibo Yuan, and Philip Anthony. "High-Efficiency NPC Multilevel Converter Using Super-Junction MOSFETs." IEEE Transactions on Industrial Electronics 63, no. 1 (January 2016): 25–37. http://dx.doi.org/10.1109/tie.2015.2466553.

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Floricau, Dan, Guillaume Gateau, and Alexandre Leredde. "New Active Stacked NPC Multilevel Converter: Operation and Features." IEEE Transactions on Industrial Electronics 57, no. 7 (July 2010): 2272–78. http://dx.doi.org/10.1109/tie.2009.2033484.

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Shanono, Ibrahim Haruna, Nor Rul Hasma Abdullah, and Aisha Muhammad. "A Survey of Multilevel Voltage Source Inverter Topologies, Controls, and Applications." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 3 (September 1, 2018): 1186. http://dx.doi.org/10.11591/ijpeds.v9.i3.pp1186-1201.

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Multi-level converters are every day attracting research interest due to it tremendous positive contributions they are making in the power industries. The converter has put hope in the minds of power electronic engineers that a time will come when it will break a record by providing an efficient means of utilizing the abundant renewable energy resources.<strong> </strong>The paper presents a review of multilevel voltage source converters that are widely being used in engineering applications. It reports the technological advancements in converter topologies of Flying Capacitor (FC), Neutral Point (NPC) /Diode Clamped, and Cascaded H-Bridge (CHB) with their respective advantages and disadvantages. Recent customized/hybrid topologies of the three-phase multilevel inverter with reduced component count and switching combination are reported. The paper also reviewed different modulation techniques such as the multilevel converter carrier base PWM, Space Vector Modulation techniques (SVM), and Selective Harmonic Elimination method (SHE-PWM). Finally, various multilevel converters areas of application were highlighted. This review will expose the reader to the latest developments made in the multi-level topologies, modulation techniques, and applications.

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Górski, Dominik Andrzej. "Analysis of squirrel-cage induction generator start-up supported by reactive power compensator." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 2 (November 16, 2019): 265–78. http://dx.doi.org/10.1108/compel-04-2019-0149.

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Purpose The power electronic converter is used for the satisfaction of reactive power demand of induction generator, when grid-tied. This paper aims to present an application of STATCOM to reduce inrush transient caused by the connection of a squirrel-cage induction generator (SCIG) to the grid. Design/methodology/approach The power generation system consists of an uncontrolled prime mover, a SCIG and a power electronic converter connected to the grid. The three-phase Neutral Point Clamped (NPC) converter works as a STATCOM to satisfy a reactive power demand of the generator. A control scheme of STATCOM uses the x-y reference frame rotating synchronously with grid voltage vector and the p-q instantaneous power theory to calculate q component of grid power. Findings It is shown that the parallel converter, which works as a reactive power compensator allows decreasing transients during a grid connection of the induction generator. Research limitations/implications Transients during a grid connection of the induction generator are only partially decreased. Practical implications It is needed to compensate for the reactive power of a SCIG. The NPC converter works as a STATCOM. The converter partially reduces grid transients during generator connection. The laboratory tests are demonstrated by connection 7.5 kW induction generator to 8 kVA transformer. Originality/value The paper presents the mitigation of grid transients during connection of induction generator with the power electronic converter working as reactive power compensator.

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Selvabharathi, D., Palanisamy R, K. Selvakumar, V. Kalyanasundaram, D. Karthikeyan, Amal Nair, Kriti Karnavat, and Annanya Sharma. "Simulation of Zeta Converter Based 3-level NPC Inverter with PV System." Indonesian Journal of Electrical Engineering and Computer Science 12, no. 1 (October 1, 2018): 1. http://dx.doi.org/10.11591/ijeecs.v12.i1.pp1-6.

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<span lang="EN-US">This paper proposes increasing the efficiency of the autonomous Photovoltaic (PV) system by utilizing zeta converter alongside neutral point clamped multilevel inverters (NPC-MLI) based on innovative PWM scheme. The PV system acts as an input source and the relevant control of zeta converter through maximum power point tracking (MPPT) offers the maximum available power from the PV array connected to DC-link. To obtain a high voltage gain we need to exhaust the dc-link voltage as much as possible and reduce stress on the switches. For this the NPC-MLI algorithm approaches PWM technique to perform capacitive charging in parallel and discharging in series to obtain maximum voltage gain. The proposed scheme is designed and verified via detailed simulations in the MATLAB/Simulink environment. </span>

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Gui, Shi Weng, Lu Wang, and Sheng Hua Huang. "An Improved VSVPWM Strategy of Considering Neutral-Point Potential Balancing in Three-Level NPC Converter." Applied Mechanics and Materials 496-500 (January 2014): 1079–83. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1079.

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Neutral-point (NP)-clamped three-level converter is a widely used topology in the research fields of the multilevel converters, which suffers from the NP voltage drift as its main technical drawback. In theory, it is based on the fact that the virtual space vector modulation approach could completely control the balance of neutral-point potential, so this paper introduces a improved control strategy of neutral-point potential balancing in three-level converter, which combines the space vector modulation approach based on virtual vectors with the algorithm of modifying small vectors pairs distribution time accurately. Relative to the traditional proposed algorithm of setting voltage tolerance range to modify small vectors pairs distribution time,the performance of algorithm of capacitor charge balancing is better and its accuracy of control is more precise. The feasibility of the proposed control approach has been verified via experiment results.

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Salama, Othmane, Mohamed Benchagra, and Abdelmoumen Tabyaoui. "NPC Multilevel Photovoltaic Inverter with Nonlinear MPPT Using Boost Converter." International Review of Automatic Control (IREACO) 10, no. 6 (November 30, 2017): 476. http://dx.doi.org/10.15866/ireaco.v10i6.13011.

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Riachy, L. "Multiobjective Predictive Control for Three-Level NPC Grid Connected Converter." International Journal of Digital Information and Wireless Communications 8, no. 1 (2018): 75–80. http://dx.doi.org/10.17781/p002409.

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Rajesh, M., and Bhim Singh. "Three-level NPC rectifier-based midpoint converter-fed SRM drive." International Journal of Power Electronics 6, no. 1 (2014): 1. http://dx.doi.org/10.1504/ijpelec.2014.060702.

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Lin, B. R., and T. C. Wei. "Current sensorless three-phase NPC converter with less power switches." IEE Proceedings - Electric Power Applications 150, no. 5 (2003): 555. http://dx.doi.org/10.1049/ip-epa:20030489.

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35

Reusser, Carlos A., and Hector Young. "Four-Level Quasi-Nested Inverter Topology for Single-Phase Applications." Electronics 10, no. 3 (January 20, 2021): 233. http://dx.doi.org/10.3390/electronics10030233.

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In this paper, a novel four-level single-phase multilevel converter is introduced, consisting of six active switches arranged in a quasi-nested configuration. The proposed topology synthesizes its output voltage levels with respect to a floating neutral point, using four cascaded capacitors with identical voltage levels. The proposed converter contains a reduced number of components compared to the neutral point clamped (NPC) or active-NPC topologies (ANPC) for the same number of output voltage levels, since it does not require diode or active switch clamping to a neutral point. Moreover, no floating capacitors with asymmetric voltage levels are employed, thereby simplifying the capacitor voltage balancing. The switching operation principles, modulation technique and control scheme for supplying a single-phase resistive-inductive load are addressed in detail. The proposed four-level inverter allows generating an additional output voltage level with the same semiconductor count as conventional three-level inverters such as NPC and ANPC which allows a superior waveform quality, with a THDv reduction of 32.69% in comparison the clamped inverters. Experimental tests carried out in a laboratory-scale setup verify the feasibility of the proposed topology.

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Wang, Yingjie, Haiyuan Liu, Wenchao Wang, and Kangan Wang. "A Novel Neutral-Point Potential Balance Strategy for Three-Level NPC Back-to-Back Converter Based on the Neutral-Point Current Injection Model." Mathematical Problems in Engineering 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/736828.

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The neutral-point (NP) potential balance control in three-level neutral-point-clamped (NPC) back-to-back converter is a research nodus. Its current strategies are the same as the strategies of a single three-level NPC converter. But the strategies do not give full play to its advantages that the neutral-point current can only flow through the connected midlines in both sides of the converter but does not flow through the DC-bus capacitors. In this paper, firstly the NP potential model based on the NP current injected is proposed. It overcomes numerous variable constraints and mutual coupling in the conventional model based on the zero-sequence voltage injected. And then on this basis, three NP-potential balance control algorithms, unilateral control, bilateral independent control, and bilateral coordinated control, are proposed according to difference requirements. All of these algorithms use the midlines rather than the DC-bus capacitors to flow the NP current as much as possible. Their control abilities are further quantitatively analyzed and compared. Finally, simulation results verify the validity and effectiveness of these algorithms.

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Ye, Zongbin, Yiming Xu, Fei Li, Xianming Deng, and Yuanzheng Zhang. "Simplified PWM Strategy for Neutral-Point-Clamped (NPC) Three-Level Converter." Journal of Power Electronics 14, no. 3 (May 20, 2014): 519–30. http://dx.doi.org/10.6113/jpe.2014.14.3.519.

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Okui, Hideyuki, and Hisaichi Irie. "NPC Four-Quadrant DC-DC Converter Applying Integrated-Voltage-Control Method." IEEJ Transactions on Industry Applications 118, no. 2 (1998): 164–72. http://dx.doi.org/10.1541/ieejias.118.164.

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Qian, Peng, and Liangbi Li. "Neutral‐point voltage balancing in wind power NPC three‐level converter." Electronics Letters 53, no. 6 (March 2017): 424–26. http://dx.doi.org/10.1049/el.2016.4702.

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Suzdalenko, Alexander, Janis Zakis, Pavels Suskis, and Leonids Ribickis. "Bidirectional single-loop current sensorless control applied to NPC multi-level converter considering conduction losses." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 4 (December 1, 2020): 1945. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp1945-1957.

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The current feedback is considered as unavoidable part of most control system driving power electronic converters. However, it is possible to eliminate the use of current sensor, if properly calculated volt-second balance is applied to input inductor. This paper describes the implementation of current sensorless control technique applied to neutral point clamped multi-level converter, where only voltage control-loop is used to stabilize internal capacitors voltage, while inductor’s current is shaped by means of current sensorless control block in both discontinuous and continuous current modes. The capacitor voltage balancing is implemented by means of delta-controller that selects alternative capacitor in respect to main switching scheme. Finally, the analytical study of proposed solution is verified with simulation results.

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Lee, Jun-Young, Hyun-Jun Choi, Ju-Yong Kim, and Jee-Hoon Jun. "A Control Method to Improve Power Conversion Efficiency of Three-level NPC-Based Dual Active Bridge Converter." Transactions of the Korean Institute of Power Electronics 22, no. 2 (April 20, 2017): 150–58. http://dx.doi.org/10.6113/tkpe.2017.22.2.150.

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Madasamy, P., Rajesh Verma, A. Rameshbabu, A. Murugesan, R. Umamageswari, Josiah Lange Munda, C. Bharatiraja, and Lucian Mihet-Popa. "Neutral Point Clamped Transformer-Less Multilevel Converter for Grid-Connected Photovoltaic System." Electronics 10, no. 8 (April 19, 2021): 977. http://dx.doi.org/10.3390/electronics10080977.

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Transformer-less (TL) inverter topologies have elicited further special treatment in photo-voltaic (PV) power system as they provide high efficiency and low cost. Neutral point clamped (NPC) multilevel-inverter (MLI) topologies-based transformer-less are being immensely used in grid-connected medium-voltage high-power claims. Unfortunately, these topologies such as NPC-MLI, full-bridge inverter with DC bypass (FB-DCBP) suffer from the shoot-through problem on the bridge legs, which affect the reliability of the implementation. Based on the previous above credits, a T type neutral point clamped (TNP)—MLI (TNP-MLI) with transformer-less topology called TL-TNP-MLI is presented to be an alternate which can be suitable in the grid-connected PV power generation systems. The suggested TL-TNP-MLI topologies free from inverter bridge legs shoot-through burden, switching frequency common-mode current (CMC), and leakage current. The control system of the grid interface with hysteresis current control (HCC) strategy is proposed. The effectiveness of the proposed PV connected transformer-less TNP-MLI topology with different grid and PV scenario has been verified through the MATLAB/Simulink simulation model and field-programmable gate area (FPGA)-based experimental results for a 1.5 kW system.

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Kant, Piyush, and Bhim Singh. "Multi‐pulse AC–DC converter fed SVM controlled NPC inverter based VCIMD." IET Power Electronics 11, no. 14 (October 4, 2018): 2204–14. http://dx.doi.org/10.1049/iet-pel.2018.5084.

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Shen, Jie, Stefan Schroder, Bo Qu, Yingqi Zhang, Kunlun Chen, Fan Zhang, and Richard Zhang. "Modulation Schemes for a 30-MVA IGCT Converter Using NPC H-Bridges." IEEE Transactions on Industry Applications 51, no. 5 (September 2015): 4028–40. http://dx.doi.org/10.1109/tia.2015.2422828.

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Ning, Li, Gao Tong, Zhang Hui, and Yang Ping. "Comparative research of harmonic suppression algorithm of the three-level NPC converter." Journal of Engineering 2019, no. 16 (March 1, 2019): 1271–74. http://dx.doi.org/10.1049/joe.2018.8846.

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Zhou, Jiuyang, and Po-Tai Cheng. "Modulation Methods for 3L-NPC Converter Power Loss Management in STATCOM Application." IEEE Transactions on Industry Applications 55, no. 5 (September 2019): 4965–73. http://dx.doi.org/10.1109/tia.2019.2924407.

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Tan, Guojun, Qingwei Deng, and Zhan Liu. "An Optimized SVPWM Strategy for Five-Level Active NPC (5L-ANPC) Converter." IEEE Transactions on Power Electronics 29, no. 1 (January 2014): 386–95. http://dx.doi.org/10.1109/tpel.2013.2248172.

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Bor-Ren Lin and Ta-Chang Wei. "Space vector modulation strategy for an eight-switch three-phase NPC converter." IEEE Transactions on Aerospace and Electronic Systems 40, no. 2 (April 2004): 553–66. http://dx.doi.org/10.1109/taes.2004.1310004.

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Pulikanti, Sridhar R., Mohamed S. A. Dahidah, and Vassilios G. Agelidis. "Voltage Balancing Control of Three-Level Active NPC Converter Using SHE-PWM." IEEE Transactions on Power Delivery 26, no. 1 (January 2011): 258–67. http://dx.doi.org/10.1109/tpwrd.2010.2063718.

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Hauk, Erika, Rodrigo Álvarez, Jens Weber, Steffen Bernet, Daniel Andler, and Jose Rodríguez. "New Junction Temperature Balancing Method for a Three Level Active NPC Converter." EPE Journal 22, no. 2 (June 2012): 6–12. http://dx.doi.org/10.1080/09398368.2012.11463818.

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Journal articles on the topic 'NPC Converter'

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