Journal articles: 'NPC three level converters'

1

Hussain, Shafquat, Simone Cosso, Massimiliano Passalacqua, Luis Ramon Vaccaro, Andrea Formentini, and Mario Marchesoni. "Efficiency Performance of 7-Level Multiplexed and 3-Level Neutral Point Clamped (NPC) Converters." Energies 18, no. 9 (2025): 2161. https://doi.org/10.3390/en18092161.

Full text

Abstract:

In medium-voltage AC applications, multilevel converters are essential due to their ability to achieve high efficiency and significantly reduce total harmonic distortion (THD), ensuring improved performance and power quality. This paper presents a detailed analysis of the efficiency, power loss, and THD characteristics of multiplexed multilevel converters and neutral point clamped converters. Using MATLAB®Simulink 2024b, the switching and conduction losses of both multiplexed multilevel converters and NPC converters are calculated. The three-level NPC converter offers advantages of a simpler design, reduced component count, and cost effectiveness with the drawback of low voltage quality. Simulation results validate the THD, power losses, and efficiency for the conventional three-phase three-level NPC converter and the three-phase multiplexed multilevel converter, and a detailed comparison is performed.

APA, Harvard, Vancouver, ISO, and other styles

2

Vagner Rocha, Anderson, Gleisson Jardim França, Manoel Eustáquio dos Santos, Hélder de Paula, and Braz de Jesus Cardoso Filho. "A Fault-resilient Implementation Of Three Level Npc Igct-based Converters." Eletrônica de Potência 16, no. 2 (2011): 168–76. http://dx.doi.org/10.18618/rep.2011.2.168176.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Peng, Xi, Sheng Yin, and Yingqin Zou. "Research on dynamic current sharing method of parallel connected IGBT modules for NPC three level converters." Journal of Physics: Conference Series 2113, no. 1 (2021): 012055. http://dx.doi.org/10.1088/1742-6596/2113/1/012055.

Full text

Abstract:

Abstract The parallel connection of IGBTs has been being applied in high power neutral point clamped (NPC) three level converters. This paper investigates the impact of gate parameters (gate resistor and capacitance) on dynamic current imbalance of parallel connected IGBT for NPC three level converter. A gate parameters calculation method is proposed in the paper, and the delay time and collector current difference can be analysed quantitatively. Experimental results have shown the effectiveness of the method.

APA, Harvard, Vancouver, ISO, and other styles

4

Wang, Ziying, Ning Jiao, Shunliang Wang, Junpeng Ma, Rui Zhang, and Tianqi Liu. "Quantitative Analysis of Balancing Range for Single-Phase 3L-NPC Converters." Energies 17, no. 6 (2024): 1464. http://dx.doi.org/10.3390/en17061464.

Full text

Abstract:

Multiple techniques have been suggested to achieve control balance in single-phase three-level neutral-point clamped (3L-NPC) converters. Nevertheless, there is a deficiency of quantitative calculations related to the extent of balancing. Operating beyond the balancing range may result in a sequence of safety incidents. This paper presents a conceptualization of the 3L-NPC converter as two cascaded H-bridges. By employing power conservation principles, the balancing range for the NPC converter is derived, and two novel methods are investigated to broaden the balance range in accordance with the calculated balance range. A comparison is made among the balancing ranges under different balancing control methods. This study establishes a theoretical foundation to ensure the secure and stable operation of the NPC converter.

APA, Harvard, Vancouver, ISO, and other styles

5

Maklakov, Aleksandr S., and Ivan N. Erdakov. "Study of Behavior of Voltage and Current Spectra of Three-Level Neutral Point Clamped Converter at Selected Harmonic Elimination Programmed Pulse Pattern Pulse-Width Modulation." Energies 16, no. 13 (2023): 5183. http://dx.doi.org/10.3390/en16135183.

Full text

Abstract:

The issue of converted voltage distortion by high-power converters at pulse-width modulation (PWM) with a low switching frequency of semiconductor modules is still relevant. Currently, the Programmed Pulse Pattern PWM (PPWM) technique is used extensively that allows pre-eliminating the selected harmonics from the converter’s voltage and current spectrum or reducing them to meet the voltage quality standard requirements. A review of scientific publications has shown the insufficiency of available studies on defining and estimating the impact of powerful converters with PPWM. The problem of defining the amplitudes of higher harmonics generated by a converter with PPWM, which are the main cause of electronic equipment failures at the common grid connection point, is particularly relevant. This study considers the behavior of the NPC converter voltage and current spectra at PPWM with the selected harmonic elimination (SHE) for three-level (3L) voltage waveforms. The behavior of up to the 50th non-eliminated harmonics in the NPC converter voltage and current spectra is first shown for a modulation factor changing within 0–1.15 at the pitch of 0.01 for six different SHE PPWM: no. 1–5 and 7; no. 2–5, 7, 11, and 13; no. 3–5, 7, 11, 13, 17, and 19; no. 4–5, 7, 11, 13, 17, 19, 23, and 25; no. 5–5, 7, 11, 13, 17, 19, 23, 25; 29, and 31; no. 6–5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, and 37. The concept proposed herein allows measuring the current consumed amplitudes of NPC converter with SHE PPWM at the low average error of about 6%. The adequacy of the approach used herein to determine the current harmonic amplitudes has been experimentally verified with laboratory equipment. The results are consistent with engineering accuracy. The research work is promising for further study and estimation of the impact of the NPC converter SHE PPWM for more complex multi-pulse grid connection circuits and resonance phenomena.

APA, Harvard, Vancouver, ISO, and other styles

6

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.

Full text

Abstract:

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%.

APA, Harvard, Vancouver, ISO, and other styles

7

Kim, Myoungho, and Hyeok-Jin Yun. "A Basic Design Tool for Grid-Connected AC–DC Converters Using Silcon Carbide MOSFETs." Electronics 12, no. 23 (2023): 4828. http://dx.doi.org/10.3390/electronics12234828.

Full text

Abstract:

The design and optimization of power converters is a key factor in the growth and development of the power electronics field. However, the process of designing a power converter is not straightforward, and engineers often rely on experience and intuition, sometimes requiring time-consuming computer simulations. This paper presents a tool for the basic design of grid-connected AC–DC converters. The design tool takes specifications and operating conditions for two-level and three-level NPC converter topologies and derives a draft design. The tool calculates the input filter’s electrical parameters, the converter’s losses, the temperature rise of the power semiconductor devices, and the ripple current and voltage of the DC-link capacitor. In order to validate the proposed design tool, four AC–DC converters using SiC MOSFETs were designed. Based on the design results, simulation models and prototypes were fabricated to verify the performance and confirm that the proposed design tool can be used in the basic design process of converters.

APA, Harvard, Vancouver, ISO, and other styles

8

Lin, Hao, Jose I. Leon, Wensheng Luo, et al. "Integral Sliding-Mode Control-Based Direct Power Control for Three-Level NPC Converters." Energies 13, no. 1 (2020): 227. http://dx.doi.org/10.3390/en13010227.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

9

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 (2019): 4167. http://dx.doi.org/10.3390/en12214167.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

10

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 (2020): 144–48. http://dx.doi.org/10.46501/ijmtst060922.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

12

Bruckner, Thomas, Steffen Bernet, and Peter K. Steimer. "Feedforward Loss Control of Three-Level Active NPC Converters." IEEE Transactions on Industry Applications 43, no. 6 (2007): 1588–96. http://dx.doi.org/10.1109/tia.2007.908164.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Jun, Eun-Su, Minh Hoang Nguyen, and Sangshin Kwak. "Model Predictive Control Method Based on Deterministic Reference Voltage for Single-Phase Three-Level NPC Converters." Applied Sciences 10, no. 24 (2020): 8840. http://dx.doi.org/10.3390/app10248840.

Full text

Abstract:

When single-phase three-level neutral-point-clamped (NPC) converters operate, there are two main control objectives that need to be met for correct operation. First, the ac source current must be controlled to be sinusoidal. Second, the dc capacitor voltages must be balanced. In original model predictive control (MPC) methods for NPC converters, an optimization process involving an empirical weighting factor design is required to meet both of these objectives simultaneously. This study proposes an MPC approach developed for single-phase three-level NPC converters to meet these objectives using a single reference voltage consisting of a difference-mode term and a common-mode term in each phase. The difference-mode term and the common-mode term are responsible for sinusoidal ac source current synthesis and dc capacitor voltage balancing, respectively. Then, a single cost function compares the adjusted reference voltage with possible voltage candidates to select an optimal switching state, resulting in the smallest cost function value. Different from the conventional MPC method, the proposed approach avoids the selection of weighting factors and the attendance of various control objectives. Thanks to the deterministic approach, the proposed MPC method is straightforward to implement and maintain fast transient performance while guaranteeing the control objectives. Finally, the effectiveness and feasibility of the proposed approach for single-phase three-level NPC are verified through comprehensive experimental results.

APA, Harvard, Vancouver, ISO, and other styles

14

Ghennam, Tarak, Lakhdar Belhadji, Nassim Rizoug, Bruno Francois, and Seddik Bacha. "A Three-Level Neutral-Point-Clamped Converter Based Standalone Wind Energy Conversion System Controlled with a New Simplified Line-to-Line Space Vector Modulation." Energies 17, no. 9 (2024): 2214. http://dx.doi.org/10.3390/en17092214.

Full text

Abstract:

Wind power systems, which are currently being constructed for the electricity worldwide market, are mostly based on Doubly Fed Induction Generators (DFIGs). To control such systems, multilevel converters are increasingly preferred due to the well-known benefits they provide. This paper deals with the control of a standalone DFIG-based Wind Energy Conversion System (WECS) by using a three-level Neutral-Point-Clamped (NPC) converter. The frequency and magnitude of the stator output voltage of the DFIG are controlled and fixed at nominal values despite the variable rotor speed, ensuring a continuous AC supply for three-phase loads. This task is achieved by controlling the DFIG rotor currents via a PI controller combined with a new Simplified Direct Space Vector Modulation strategy (SDSVM), which is applied to the three-level NPC converter. This strategy is based on the use of a line-to-line three-level converter space vector diagram without using Park transformation and then simplifying it to that of a two-level converter. The performance of the proposed SDSVM technique in terms of controlling the three-level NPC-converter-based standalone WECS is demonstrated through simulation results. The whole WECS control and the SDSVM strategy are implemented on a dSPACE DS 1104 board that drives a DFIG-based wind system test bench. The obtained experimental results confirm the validity and performance in terms of control.

APA, Harvard, Vancouver, ISO, and other styles

15

Idkhajine, Lahoucine, Mohamed Aarab, and Eric Monmasson. "System Identification–Based Adaptive Real-Time Simulators for Power Electronic Converters—Application to Three-Phase and NPC Inverters." Electronics 12, no. 5 (2023): 1094. http://dx.doi.org/10.3390/electronics12051094.

Full text

Abstract:

This paper deals with the real-time simulation of power electronic converters. It discusses a new approach for designing embedded real-time simulators (eRTSs) that approximate the static and dynamic behavior of a power converter at the switching scale. The main concept is to approximate the voltage/current experimental characteristics of each switch using dedicated transfer functions obtained after a system identification process. The adaptive feature of such eRTS consists of developing varying and online reconfigurable coefficients transfer functions. The main potential of doing so is the possibility of reconfiguring the model according to the actual electrical/thermal environment where the power converter is used. Then, the latter is subdivided into independent switching cells, represented by dedicated RT models that are fully parallelized. Furthermore, using FPGA devices makes it possible to achieve very low latencies and, consequently, a short simulation time step. Previous work was published in this context, where this approach was deeply described and tested with half-bridge DC–DC, full-bridge DC–AC, and multi-level cascaded H-bridge (five-level and nine-level) power converters. This paper recalls the main basics and, more importantly, discusses additional case studies, namely a three-phase voltage source inverter, a half-bridge NPC (neutral-point clamped) inverter, and a three-phase NPC inverter.

APA, Harvard, Vancouver, ISO, and other styles

16

Balamurugan, M., G. B. Arjun Kumar, Sujit Kumar, and G. Sridhar. "Design of 3-Level T-type NPC Inverter for EV Applications." IOP Conference Series: Materials Science and Engineering 1295, no. 1 (2023): 012002. http://dx.doi.org/10.1088/1757-899x/1295/1/012002.

Full text

Abstract:

Abstract In recent years, there has been a significant demand for lightweight converters that provide exceptional control performance while generating minimal acoustic noise. This has resulted in higher switching signals for hard- switched 2-level low voltage 3-phase inverters. However, the increased switching frequencies have a negative impact on the inverters’ efficiency, requiring the use of expensive switch technology to maintain high efficiency. This paper aims to tackle these challenges by introducing the design and implementation of a extremely effective 3-Level T-Type Neutral Point Clamped (NPC) inverter designed for Electric Vehicle (EV) applications. 3-Level T-Type NPC inverter associates the strengths of both NPC and T-Type inverters. Similar towards the NPC, it offers a lower breakdown voltage for the switching devices, thereby reducing switching losses. Additionally, it shares the characteristics of the T-Type inverter, resulting in fewer conduction losses. To validate the feasibility of the converter, simulation is performed using MATLAB software, followed by the development and testing of a lab-scale prototype. The proposed three-level T-type NPC inverter have several merits over traditional 2-level inverters, including reduced distortion, switching losses, and improved efficiency. These benefits contribute to enhanced motor drive performance, reduced electromagnetic interference (EMI), and extended battery life in EVs.

APA, Harvard, Vancouver, ISO, and other styles

17

Razali, Azziddin Mohamad, Nor Azizah Mohd Yusoff, Syahar Azalia Ab Shukor, Muhammad Hafeez Mohamed Hariri, Auzani Jidin, and Tole Sutikno. "Analysis of VFDPC for three-level neutral point clamped AC-DC converters with capacitor balancing s." Indonesian Journal of Electrical Engineering and Computer Science 38, no. 1 (2025): 63. https://doi.org/10.11591/ijeecs.v38.i1.pp63-75.

Full text

Abstract:

This paper presents an analysis of the dynamic performance of a three-level neutral point clamped (NPC) AC-DC converter utilizing the advanced control technique of virtual flux direct power control (VFDPC). VFDPC estimates the three-phase grid voltage and instantaneous active and reactive power components, eliminating the need for an AC input voltage sensor used in conventional direct power control (DPC). This reduction in sensors decreases system complexity and cost while mitigating high-frequency noise and interference. Integrating VFDPC into 3L NPC AC-DC converters significantly enhances overall performance, leading to more efficient and robust power conversion systems. However, a significant challenge in the three-level NPC topology is the voltage imbalance in the neutral point of the DC-link capacitor, which can cause excessive voltage stress on switching devices and degrade system performance. To address this, a novel lookup table has been developed, incorporating strategies to balance the capacitor voltage. The results of this study demonstrate that VFDPC generates nearly sinusoidal line currents with reduced current total harmonic distortion (THD). Additionally, VFDPC ensures unity, lagging, and leading power factor operation, while providing flexibility to adjust the DC-link output voltage and accommodate load variations. These capabilities highlight VFDPC effectiveness in managing power quality and system stability, even under varying load conditions.

APA, Harvard, Vancouver, ISO, and other styles

18

Azziddin, Mohamad Razali Nor Azizah Mohd Yusoff Syahar Azalia Ab Shukor Muhammad Hafeez Mohamed Hariri Auzani Jidin Tole Sutikno. "Analysis of VFDPC for three-level neutral point clamped AC-DC converters with capacitor balancing solution." Indonesian Journal of Electrical Engineering and Computer Science 38, no. 1 (2025): 63–75. https://doi.org/10.11591/ijeecs.v38.i1.pp63-75.

Full text

Abstract:

This paper presents an analysis of the dynamic performance of a three-level neutral point clamped (NPC) AC-DC converter utilizing the advanced control technique of virtual flux direct power control (VFDPC). VFDPC estimates the three-phase grid voltage and instantaneous active and reactive power components, eliminating the need for an AC input voltage sensor used in conventional direct power control (DPC). This reduction in sensors decreases system complexity and cost while mitigating high-frequency noise and interference. Integrating VFDPC into 3L NPC AC-DC converters significantly enhances overall performance, leading to more efficient and robust power conversion systems. However, a significant challenge in the three-level NPC topology is the voltage imbalance in the neutral point of the DC-link capacitor, which can cause excessive voltage stress on switching devices and degrade system performance. To address this, a novel lookup table has been developed, incorporating strategies to balance the capacitor voltage. The results of this study demonstrate that VFDPC generates nearly sinusoidal line currents with reduced current total harmonic distortion (THD). Additionally, VFDPC ensures unity, lagging, and leading power factor operation, while providing flexibility to adjust the DC-link output voltage and accommodate load variations. These capabilities highlight VFDPC effectiveness in managing power quality and system stability, even under varying load conditions.

APA, Harvard, Vancouver, ISO, and other styles

19

LAZREG, Mohamed Haithem. "Control of dual star induction generator based on multi-level inverter used in wind energy conversion system." Physics of Semiconductor Devices & Renewable Energies Journal 1, no. 1 (2024): 12. http://dx.doi.org/10.59684/psdrej.v1i1.11.

Full text

Abstract:

This paper presents vector control of dual star induction generator (DSIG) integrated into variable speed wind energy and supplied by three-level NPC converters. Now the DSIG is the most common among multiphase machines when used in high power generation systems, which is associated with two converters. Maximum power point tracking (MPPT) for extracting a maximum of power fluctuating wind speed is illustrated. In order to decrease the fluctuations that appear in the currents generated by DSIG to the electrical network, we propose the NPC structure three-level inverter. Simulation results of a 1.5 MW Wind turbine are presented to illustrate the validity of this application.

APA, Harvard, Vancouver, ISO, and other styles

20

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 (2017): 579–88. http://dx.doi.org/10.1515/bpasts-2017-0063.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

21

Reusser, Carlos A., Matías Parra, Gerardo Mino-Aguilar, and Victor R. Gonzalez-Diaz. "Comparison of Induction Machine Drive Control Schemes on the Distribution of Power Losses in a Three-Level NPC Converter." Machines 13, no. 3 (2025): 227. https://doi.org/10.3390/machines13030227.

Full text

Abstract:

Medium- and high-power drive applications have grown since the past decade as the most common solution for high demanding industrial processes. Multilevel converters, in particular the three-level neutral point clamped (3L-NPC) topology driving medium-voltage induction machines, has become the most commonly adopted solution. In this context, several AC drive control schemes are suitable, such as scalar control (SC), field-oriented control (FOC), model predictive control (MPC), and direct torque control (DTC). Each of these control strategies exhibit a particular operational profile which affects the switching pattern of the converter semiconductors, thus conditioning the switching and conducting losses of these power devices. This work presents a comparison of the conduction and switching losses between different drives control schemes, such as scalar control, field-oriented control, direct torque control, and model predictive control, analyzing their impact on thermal efficiency in a 3L-NPC multilevel converter, under different loading operational conditions. This analysis allows for choosing the most suitable control strategy and switching frequency for a given operational profile.

APA, Harvard, Vancouver, ISO, and other styles

22

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

23

Zhang, Maosong, Ying Cui, Qunjing Wang, et al. "A Study on Neutral-Point Potential in Three-Level NPC Converters." Energies 12, no. 17 (2019): 3367. http://dx.doi.org/10.3390/en12173367.

Full text

Abstract:

This paper proposes an accurate mathematical model of three-level neutral-point-clamped (NPC) converters that can accurately represent the midpoint potential drift of the DC link with parameter perturbation. The mathematical relationships between the fluctuation in neutral-point voltage, the parametric perturbation, and the capacitance error are obtained as mathematical expressions in this model. The expressions can be used to quantitatively analyze the reason for the neutral-point voltage imbalance and balancing effect based on a zero-sequence voltage injection. The injected zero-sequence voltage, which can be used to balance the DC-side voltages with the combined action of active current, can be easily obtained from the proposed model. A balancing control under four-quadrant operation modes is proposed by considering the active current to verify the effectiveness of this model. Both the simulation and experiment results validate the excellent performance of the proposed model compared to the conventional model.

APA, Harvard, Vancouver, ISO, and other styles

24

Portillo, Ramon, Sergio Vazquez, Jose I. Leon, Maria M. Prats, and Leopoldo G. Franquelo. "Model Based Adaptive Direct Power Control for Three-Level NPC Converters." IEEE Transactions on Industrial Informatics 9, no. 2 (2013): 1148–57. http://dx.doi.org/10.1109/tii.2012.2209667.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Wang, Yiying, Longyu Gao, Lifen Ma, Yang Liu, Yanhui Wu, and Jikun Dai. "Research on High-Frequency Isolated NPC Three-Level Inverter for Frequency Conversion and Speed Regulation." Applied Sciences 14, no. 21 (2024): 9673. http://dx.doi.org/10.3390/app14219673.

Full text

Abstract:

Mining frequency converters are the primary means for achieving variable frequency speed regulation of electromechanical equipment in coal mines, offering energy-saving benefits for coal mining enterprises. The common power supply method involves converting high voltage to low voltage using power frequency transformers before supplying equipment. However, this integration of power frequency transformers with supply devices occupies significant space, making it unsuitable for confined underground environments. Additionally, they suffer from poor output waveform quality and high harmonic content. To tackle these challenges, this paper presents a three-stage topology for high-frequency isolated frequency conversion and speed regulation, utilizing three-phase uncontrolled rectification, a single active isolated DC/DC converter, and an NPC three-level inverter. The control strategies for each stage are discussed in detail. Simulations and experimental results confirm the validity and feasibility of the proposed design, demonstrating enhanced stability and dynamic performance of the three-stage high-frequency isolated frequency converter.

APA, Harvard, Vancouver, ISO, and other styles

26

Bhowmick, Supratik, Debranjan Mukherjee, Suman Maiti, and Chandan Chakraborty. "Grid-Tied Neutral Point Clamped based Centralised Photovoltaic Inverter with Improved DC Link Voltage Balancing and Harmonic Minimisation Control." Power Electronics and Drives 6, no. 1 (2021): 185–203. http://dx.doi.org/10.2478/pead-2021-0011.

Full text

Abstract:

Abstract This paper proposes an improved space vector pulse width modulation (SVPWM) based DC link voltage balancing control of a three-phase three-level neutral point clamped (NPC) centralised inverter supplying the generated power from photo voltaic (PV) array to a three-phase utility grid. Two possible schemes have been developed based on the power conversion stage between PV array and the utility grid namely, two-stage (three-level boost converter three-phase three-level NPC inverter) and single-stage (three-phase three-level NPC inverter alone). The comparison between these two schemes has been thoroughly discussed in terms of the control strategies employed, power loss analysis and efficiency. The performance of the centralised inverter under different modes of operation has been investigated by developing the required control strategies for smooth operation. Using the proposed control strategy, the centralised inverter can be operated as a static synchronous compensator (STATCOM) during night time, if needed. The power loss incurred in the power-electronic converters has been analysed for constant and also for variable ambient temperature. The effectiveness of the centralised inverter as an active filter (AF) has also been verified when a three-phase non-linear load is considered in the system.

APA, Harvard, Vancouver, ISO, and other styles

27

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

28

Liu, Shiyuan, Xu Qian, Hong Wan, Zongbin Ye, Shoupeng Wu, and Xiaohong Ren. "NPC Three-Level Inverter Open-Circuit Fault Diagnosis Based on Adaptive Electrical Period Partition and Random Forest." Journal of Sensors 2020 (January 17, 2020): 1–18. http://dx.doi.org/10.1155/2020/9206579.

Full text

Abstract:

Fault detection can increase the reliability and efficiency of power electronic converters employed in power systems. Among the converters in the power system, a Neutral Point Clamped (NPC) three-level inverter is most commonly used to drive electric motors. In this paper, a new approach for open-circuit fault detection and location of the NPC three-level inverter for a shifting process using a constant voltage-to-frequency ratio is proposed. In order to diagnose open-circuit fault in as short a time as possible, an adaptive electrical period partition (AEPP) algorithm is proposed to pick single electrical periods from real-time three-phase current signals. The Maximal Overlap Discrete Wavelet Transformation (MODWT) and Park’s Vector Modulus (PVM) are used for feature analysis and normalization of electrical period signals. The statistical characteristics of the electrical period signals are extracted, and a random forest model is constructed to realize the state classification. Compared with the traditional fault diagnosis method, the proposed algorithm finds fault locations quickly and accurately. The effectiveness and accuracy of the proposed algorithm are verified by experiments.

APA, Harvard, Vancouver, ISO, and other styles

29

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 (2021): 80. http://dx.doi.org/10.3390/wevj12020080.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

30

Deng, Yi, Jun Li, Kee Ho Shin, Tero Viitanen, Maryam Saeedifard, and Ronald G. Harley. "Improved Modulation Scheme for Loss Balancing of Three-Level Active NPC Converters." IEEE Transactions on Power Electronics 32, no. 4 (2017): 2521–32. http://dx.doi.org/10.1109/tpel.2016.2573823.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Wang, Shunliang, Junpeng Ma, Bi Liu, Ning Jiao, Tianqi Liu, and Yanbo Wang. "Unified SVPWM Algorithm and Optimization for Single-Phase Three-Level NPC Converters." IEEE Transactions on Power Electronics 35, no. 7 (2020): 7702–12. http://dx.doi.org/10.1109/tpel.2019.2960208.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Shishkov, Aleksandr N., Maxim M. Dudkin, Aleksandr S. Maklakov, Van Kan Le, Andrey A. Radionov, and Vlada S. Balabanova. "An Improved Space Vector PWM Algorithm with a Seven-Stage Switching Sequence for Three-Level Neutral Point Clamped Voltage Source Inverters." Energies 18, no. 10 (2025): 2452. https://doi.org/10.3390/en18102452.

Full text

Abstract:

The main purpose of this research is to develop an improved space vector pulse-width modulation (SVPWM) algorithm for three-level (3L) neutral point clamped (NPC) voltage source inverters (VSIs). The results of experiments conducted on the three-level power converter laboratory setup showed that the proposed SVPWM algorithm with a seven-stage switching sequence (SS) can reduce a VSI’s switching frequency by 43.48% compared to the SVPWM algorithm with the base SS. It also improves the neutral point (NP) voltage balance in the VSI DC link by 4.2% by controlling the duty factor of distributed base vectors in each SVPWM period based on phase load currents. It reduced the values of the 5th- and 7th-order harmonics of the VSI output voltage by 19% and 15.7%, respectively. The results show that the usage of the improved SVPWM algorithm helps increase the efficiency of a 3L NPC VSI by 0.6% and reduce the higher harmonics. The obtained results confirm the efficiency of the suggested algorithm and its great potential for power converters in industry.

APA, Harvard, Vancouver, ISO, and other styles

33

Choi, Ui-Min, and June-Seok Lee. "Comparative Evaluation of Lifetime of Three-Level Inverters in Grid-Connected Photovoltaic Systems." Energies 13, no. 5 (2020): 1227. http://dx.doi.org/10.3390/en13051227.

Full text

Abstract:

The cost of the PV energy reduction is still required to increase the penetration level of PV systems in the energy market. The reliability of PV inverters is one of the important aspects to be enhanced in order to reduce the cost of PV energy, since it is closely related to the maintenance cost and the annual energy production. In this paper, the lifetime of NPC and T-type inverters, which are three-level inverter topologies that are widely used for PV systems, are comparatively evaluated with a 30 kW grid-connected PV system. It is performed by focusing on power devices since the power electronic components of both converters are the same except for the power devices. Therefore, this result can represent the comparison of the reliability performance of the NPC and T-type inverters. The power loss and temperature distributions of power devices are analyzed and their efficiencies are compared at different power levels with different switching frequencies. The lifetimes of the reliability-critical power devices in the NPC and T-type inverters are estimated, respectively with a one-year mission profile of the PV system, and the results are compared.

APA, Harvard, Vancouver, ISO, and other styles

34

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 (2020): 869–82. http://dx.doi.org/10.18280/jesa.530613.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

35

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 (2018): 1186. http://dx.doi.org/10.11591/ijpeds.v9.i3.pp1186-1201.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

36

Yan, Tao, Zhan Zhan Qu, Xue Long Zhang, et al. "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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

37

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 (2012): 107–20. http://dx.doi.org/10.2478/v10170-011-0015-1.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

38

Suzdalenko, Alexander, Janis Zakis, and Ingars Steiks. "Current Sensorless Control Algorithm for Single-Phase Three-Level NPC Inverter." Electrical, Control and Communication Engineering 7, no. 1 (2014): 28–33. http://dx.doi.org/10.1515/ecce-2014-0020.

Full text

Abstract:

Abstract The current measurement is becoming a challenging task in power converters operating at high switching frequencies, moreover traditional control system requires two control loops - first (slow) regulates DC-link voltage, second (fast) controls the shape of current, that all together results in complicated transfer function and long transition periods. The current sensorless control (CSC) allows neglecting the mentioned problems. This research for the first time presents the solution of CSC implementation in single-phase three-level neutral point clamped inverter. Mathematical equations were defined for inductor current peaks and transistor conduction time during discontinuous and continuous conduction modes, as well as major problem of current fitting between different voltage levels (consequently with different current peak-to-peak values) was solved, providing two solutions - pre-fitting and post-fitting trajectories. The verification of our theoretical assumptions and analytical equations was confirmed by the simulation analysis. Challenges of real experiments are discussed in the conclusion.

APA, Harvard, Vancouver, ISO, and other styles

39

Zhang, Wenli, Bo Guan, and Yujie Chang. "Two-Step Process-Based Open-Circuit Fault Diagnosis for Three-Level NPC Converters." Electronics 14, no. 3 (2025): 542. https://doi.org/10.3390/electronics14030542.

Full text

Abstract:

Fast open-circuit (OC) fault diagnosis is essential to ensure that a multilevel inverter operates under stable conditions. Conventional diagnosis methods either require additional hardware sensors or complex calculations. However, these conditions are difficult to realize in some low-cost application scenarios. For this reason, a two-step process-based OC fault diagnosis method is proposed according to available data that can be acquired using the existing sensors in the application. At the same time, the proposed method does not involve complex and precise calculation. By analyzing the effects of an OC fault on the AC-side three-phase current, the faulty bridge arm can be quickly located via the average current. Furthermore, through establishing the calculation model of the neutral point potential, an accurate diagnosis of faulty switching devices can be achieved quickly and easily based on the residuals. The proposed OC fault diagnosis method is also proved to be correct and effective based on simulation and experience.

APA, Harvard, Vancouver, ISO, and other styles

40

Hou, Wenbao, Guojun Tan, and Delu Li. "An Improved MPC-Based SVPWM Mechanism for NPC Three-Level Z-Source Converters." Mathematical Problems in Engineering 2020 (August 12, 2020): 1–12. http://dx.doi.org/10.1155/2020/4651823.

Full text

Abstract:

Model predictive control (MPC) method has been widely used to reduce the computational complexity of the traditional space vector pulse width modulation (SVPWM). However, for a neutral-point clamped three-level Z-source converter, the performance of the normal MPC strategy would highly depend on the computation processing rate because of the multiple times optimization calculation. In this paper, an improved MPC strategy has been developed, with a voltage prediction being designed to replace the current prediction, the calculation of the roll optimization could be effectively simplified significantly, and then the digital execution efficiency would be improved. Besides, in order to obtain a fixed output harmonic frequency, a combination of this improved MPC and SVPWM has been studied and the shoot-through state insertion for the Z-source also has been analyzed in detail. Lastly, comparison experiments have been carried out to make verification of this improved modulation mechanism.

APA, Harvard, Vancouver, ISO, and other styles

41

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 (2019): 691. http://dx.doi.org/10.3390/electronics8060691.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

42

Cobreces, S., J. Bordonau, J. Salaet, E. J. Bueno, and F. J. Rodriguez. "Exact Linearization Nonlinear Neutral-Point Voltage Control for Single-Phase Three-Level NPC Converters." IEEE Transactions on Power Electronics 24, no. 10 (2009): 2357–62. http://dx.doi.org/10.1109/tpel.2009.2015221.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Mora, Andres, Roberto Cardenas-Dobson, Ricardo P. Aguilera, Alejandro Angulo, Felipe Donoso, and Jose Rodriguez. "Computationally Efficient Cascaded Optimal Switching Sequence MPC for Grid-Connected Three-Level NPC Converters." IEEE Transactions on Power Electronics 34, no. 12 (2019): 12464–75. http://dx.doi.org/10.1109/tpel.2019.2906805.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Bonaldo, Jakson, Beichen Duan, Marco Rivera, K. V. Ling, Camila Fantin, and Patrick Wheeler. "Comprehensive Performance Assessment of Conventional and Sequential Predictive Control for Grid-Tied NPC Inverters: A Hardware-in-the-Loop Study." Energies 18, no. 12 (2025): 3132. https://doi.org/10.3390/en18123132.

Full text

Abstract:

Model Predictive Control (MPC) has become very attractive for the efficient control of power converters. This paper compares Classical MPC (C-MPC) and Sequential MPC (S-MPC) for a three-level NPC converter. Although C-MPC is simple to implement, it faces challenges such as switching frequency variations and complex weighting factor tuning. S-MPC addresses these issues by prioritizing control objectives sequentially, eliminating weighting factors, and simplifying controller design. Simulation results show that S-MPC improves the tracking of output currents, reduces harmonic distortion, and enhances the balancing of dc–link voltages under steady-state and transient conditions. These findings establish S-MPC as a robust alternative to C-MPC, improving power quality and system performance in multilevel converter applications.

APA, Harvard, Vancouver, ISO, and other styles

45

Aziza, Benaboud, and Rufer Alfred. "A high voltage direct current transmission system: natural and selective harmonic cancellation." International Journal of Power Electronics and Drive System (IJPEDS) 10, no. 3 (2019): 1410–18. https://doi.org/10.11591/ijpeds.v10.i3.pp1410-1418.

Full text

Abstract:

This study focused on the special High Voltage Direct Current technology. The context is given by combining two original solutions; the first solution, using a natural harmonic cancellation, consists to connect in series two classical frequency inverters which are coupled to the grid through a specific transformer connection. On the other hand, the second solution is achieved by using three, five or more level converters in square wave modulation, in order to eliminate some selective harmonics by optimizing a switching angle. The simulation and experimental results indicate that the proposed High Voltage Direct Current transmission systems offer high efficiency, unity power factor and better current and voltage quality with fewer harmonic.

APA, Harvard, Vancouver, ISO, and other styles

46

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

47

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 (2017): 150–58. http://dx.doi.org/10.6113/tkpe.2017.22.2.150.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Arkan, A. Kadum. "PWM control techniques for three phase three level inverter drives." TELKOMNIKA Telecommunication, Computing, Electronics and Control 18, no. 1 (2020): 519–29. https://doi.org/10.12928/TELKOMNIKA.v18i1.12440.

Full text

Abstract:

In this paper two very efficient pulse width modulation techniques were discussed named Sin pulse width modulation and space vector pulse width modulation. The basic structure of the three-level inverter neutral-point clamped is introduced and the basic idea about space vector pulse width modulation for three-level voltage source inverter has been discussed in detail. Nearest three vectors space vector pulse width modulation control algorithm is adopted as the control strategy for the three phase three level NPC inverter in order to compensate the neutral-point shifting. Mathematical formulation for calculating switching sequence has determined. Comparative analysis proving superiority of the space vector pulse width modulation technique over the conventional pulse width modulation, and the results of the simulations of inverter confirm the feasibility and advantage of the space vector pulse width modulation strategy over sin pulse width modulation in terms of good utilization of dc-bus voltage, low current ripple and reduced switching frequency. Space vector pulse width modulation provides advantages better fundamental output voltage and useful in improving harmonic performance and reducing total harmonic distortion.

APA, Harvard, Vancouver, ISO, and other styles

49

Salama, Othmane, Abdelmoumen Tabyaoui, and Mohamed Benchagra. "Control Methods on Three-phase Power Converters in Photovoltaic Systems." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 4 (2018): 1851. http://dx.doi.org/10.11591/ijpeds.v9.i4.pp1851-1865.

Full text

Abstract:

<span lang="EN-US">In this paper, a three-phase load connected to a NPC three-level inverter is presented. To generate gate signals for the multilevel inverter, two commands are developed and compared: the phase disposition pulse width modulation (PDPWM) and the space vector pulse width modulation (SVPWM). DC supply is provided by photovoltaic cells. Boost converter controls the power transfer from photovoltaic generator. Due to nonlinear I-V characteristics of photovoltaic cells, a maximum power point tracking algorithm is adopted to maximize the output power, the nonlinear controller (sliding mode) is developed and simulated. To verify the effectivnesse of the introdueced controller, it is compared with the fuzzy logic controller. Matlab-simulink is used for simulation, analysis and interpretation the results of these controllers.</span>

APA, Harvard, Vancouver, ISO, and other styles

50

Chen, Tao, Peng Fu, Xiaojiao Chen, et al. "An Optimal Control Algorithm with Reduced DC-Bus Current Fluctuation for Multiple Charging Modes of Electric Vehicle Charging Station." World Electric Vehicle Journal 12, no. 3 (2021): 107. http://dx.doi.org/10.3390/wevj12030107.

Full text

Abstract:

This paper presents a systematic structure and a control strategy for the electric vehicle charging station. The system uses a three-phase three-level neutral point clamped (NPC) rectifier to drive multiple three-phase three-level NPC converters to provide electric energy for electric vehicles. This topology can realize the single-phase AC mode, three-phase AC mode, and DC mode by adding some switches to meet different charging requirements. In the case of multiple electric vehicles charging simultaneously, a system optimization control algorithm is adopted to minimize DC-bus current fluctuation by analyzing and reconstructing the DC-bus current in various charging modes. This algorithm uses the genetic algorithm (ga) as the core of computing and reduces the number of change parameter variables within a limited range. The DC-bus current fluctuation is still minimal. The charging station system structure and the proposed system-level optimization control algorithm can improve the DC-side current stability through model calculation and simulation verification.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'NPC three level converters'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles