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Journal articles on the topic 'Neutral-point voltage'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Gong, Bo, Shanmei Cheng, and Yi Qin. "Simple three-level neutral point voltage balance control strategy based on SVPWM." Archives of Electrical Engineering 62, no. 1 (2013): 15–23. http://dx.doi.org/10.2478/aee-2013-0002.

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Abstract The unbalance of the neutral point voltage is an inherent problem of three-level neutral-point-clamped (NPC) inverter, the effect of neutral point voltage balancing which is caused by voltage vector is analyzed, and the relationship of the voltage offset and neutral point voltage is studied in this paper. This paper proposes a novel neutral point balance strategy for three-level NPC inverter based on space vector pulse width modulation (SVPWM). A voltage offset is added to the modulation wave, and a closed-loop neutral point voltage balance control system is designed. In the control s

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2

Wu, Xinmi, Yu Zhang, and Jiawen Yang. "Neutral-Point Voltage Balancing Method for Three-Phase Three-Level Dual-Active-Bridge Converters." Energies 15, no. 17 (2022): 6463. http://dx.doi.org/10.3390/en15176463.

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Three-phase three-level dual-active-bridge (3L-DAB3) converters are a potential topology for high-voltage and high-power applications. Neutral-point voltage balancing is a complex and important issue for three-level (3L) circuits. Compared with the single-phase 3L dual-active-bridge converter, the self-balancing capability of the 3L-DAB3 is limited. To guarantee the reliability of the converter, a neutral-point voltage balancing method for the 3L-DAB3 is proposed in this paper. First, the neutral-point voltage balancing principle of the 3L-DAB3 is analyzed. Then, the relationship between the d

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3

Chen, Guo, Chunyang Gong, Jun Bao, Lihua Zhu, and Zhixin Wang. "Compensation-Voltage-Injection-Based Neutral-Point Voltage Fluctuation Suppression Method for NPC Converters." Energies 16, no. 11 (2023): 4409. http://dx.doi.org/10.3390/en16114409.

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Three-level neutral-point clamped (NPC) inverters are widely used in the new energy power generation, motor drive, and many other occasions. However, the neutral-point voltage imbalance of an NPC inverter will affect the output of the inverter system, and the control of the neutral point voltage has become a popular research topic. In this paper, a compensation-voltage-injection-based neutral-point voltage balancing method is proposed. During the switching cycle, the average value model of the neutral-point current under different voltage vectors is applied to calculate the value of the compen

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4

Guo, Yujing, and Junhuai Zhang. "Modulation Technique Design of An Improved Zero Common Mode Voltage (CMV)." Journal of Physics: Conference Series 2563, no. 1 (2023): 012020. http://dx.doi.org/10.1088/1742-6596/2563/1/012020.

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Abstract Voltage imbalance of neutral-point and CMV are hot issues in the research of three-level inverters. This paper first introduces the three-level topology of the neutral-point clamped (NPC) inverter. Aiming to eliminate CMV of three-level NPC and balance the voltage of the neutral point simultaneously, a virtual space vector pulse modulation (VSVPWM) strategy is proposed. Virtual voltage vectors of this strategy are composed of 3 medium vectors. The voltage of the neutral point is balanced since the average current of the neutral point is 0. Therefore, the balance index is introduced to

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5

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.

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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 vol

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6

Wu, Ming, Zhenhao Song, Zhipeng Lv, Kai Zhou, and Qi Cui. "A Method for the Simultaneous Suppression of DC Capacitor Fluctuations and Common-Mode Voltage in a Five-Level NPC/H Bridge Inverter." Energies 12, no. 5 (2019): 779. http://dx.doi.org/10.3390/en12050779.

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To suppress the direct current (DC) capacitor voltage fluctuations and the common-mode voltage (CMV) in a three-phase, five-level, neutral-point-clamped (NPC)/H-bridge inverter, this paper analyzes the influence of all voltage vectors on the neutral point potential of each phase under different pulse mappings in detail with an explanation of the CMV distribution. Then, based on the traditional space vector pulse width modulation (SVPWM) algorithm, a dual-pulse-mapping algorithm is proposed to suppress the DC capacitor fluctuations and the CMV simultaneously. In the algorithm, the reference vol

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7

Celanovic, N., and D. Boroyevich. "A comprehensive study of neutral-point voltage balancing problem in three-level neutral-point-clamped voltage source PWM inverters." IEEE Transactions on Power Electronics 15, no. 2 (2000): 242–49. http://dx.doi.org/10.1109/63.838096.

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8

Liu, Yan, Xu Wang, and Yan Xing. "Research on SVPWM Method and its Neutral Point Potential Control." Advanced Engineering Forum 2-3 (December 2011): 39–42. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.39.

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Neutral-point potential unbalance is an inherent problem of Neutral-point-clamped three-level PWM rectifiers. If the problem of neutral point can’t be controlled appropriately, the harm of input current will increase, and even the dc-link capacitor and switches will be destroyed. Thus domestic and foreign experts have done lots of research on the balance control of Neutral-point-clamed and put forward many effective control methods. This paper proposes a novel SVPWM strategy for the three-level neutral-point-clamped voltage source inverter, based on the particular disposition of all the redund

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9

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 (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

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10

Jun, Eun-Su, Minh Hoang Nguyen, and Sangshin Kwak. "Three-Phase Three-Level Neutral Point Clamped Rectifier with Predictive Control Method without Employing Weighting Factor." Applied Sciences 10, no. 15 (2020): 5149. http://dx.doi.org/10.3390/app10155149.

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A predictive control method using injected offset voltage to achieve neutral point (NP) voltage balance of three-phase three-level neutral point clamped (NP) rectifiers, without employing a weighting factor, is proposed in this study. One of the biggest problems with the three-level NP rectifiers is the dc link capacitor voltage imbalance. Therefore, it is necessary to maintain the balance of the NP voltage in addition to synthesize the three-phase sinusoidal input current by control methods. Conventional predictive control methods for the NP rectifiers have used a weighting factor in a cost f

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11

Ogasawara, Satoshi, Tadashi Sawada, and Hirofumi Akagi. "Analysis of the Neutral Point Potential Variation of Neutral-Point-Clamped Voltage Source PWM Inverters." IEEJ Transactions on Industry Applications 113, no. 1 (1993): 41–48. http://dx.doi.org/10.1541/ieejias.113.41.

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12

Kang, Jin-Wook, Seung-Wook Hyun, Jae-Ok Ha, and Chung-Yuen Won. "Improved Neutral-Point Voltage-Shifting Strategy for Power Balancing in Cascaded NPC/H-Bridge Inverter." Electronics 7, no. 9 (2018): 167. http://dx.doi.org/10.3390/electronics7090167.

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This paper investigates the fault-tolerance control of a multilevel cascaded NPC/H-bridge (CNHB) inverter. The fault-tolerance control method has been widely used for multilevel inverters, such as the neutral-point voltage-shifting control, which can operate for a certain period of time by compensating for the phase voltage of a faulty stack even if one stack is broken. Even though the three-phase equilibrium is maintained in the case of failure by using the conventional neutral-point voltage-shifting control, an imbalance in the output power occurs between each stack, which causes problems fo

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13

Bogimi, Sirisha. "A grid interconnected nested neutral point clamped inverter with voltage synchronization using synchronous reference frame controller." International Journal of Applied Power Engineering (IJAPE) 10, no. 4 (2021): 362. http://dx.doi.org/10.11591/ijape.v10.i4.pp362-372.

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<p><span lang="EN-US">Nested neutral point clamped multi level inverter with inter connection to grid through the synchronous reference frame (SRF) controller for synchronization of voltage to the grid is demonstrated. The system's main feature is that voltage stress in each inverter switching device is kept to a minimum, and redundant inverter switching states are utilised for neutral point and flying capacitor voltage balancing with sinusoidal pulse-width modulation (PWM) technique, synchronisation to grid voltages, and power injection with low harmonic generation. The inverter r

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14

Chen, Hsin-Chih, Meng-Jiang Tsai, Yao-Bang Wang, and Po-Tai Cheng. "A Modulation Technique for Neutral Point Voltage Control of the Three-Level Neutral-Point-Clamped Converter." IEEE Transactions on Industry Applications 54, no. 3 (2018): 2517–24. http://dx.doi.org/10.1109/tia.2018.2799906.

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15

Tian, G., P. Yan, X. K. Hu, P. Luo, C. Su, and Q. Zhang. "Analysis of Impact of Distributed Photovoltaic on Main Transformer Gap Protection." Journal of Physics: Conference Series 2186, no. 1 (2022): 012004. http://dx.doi.org/10.1088/1742-6596/2186/1/012004.

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Abstract Distributed photovoltaic is one of the important energy supplies in new-type power system. Notably, when the main transformer is operated in non-directly grounded mode and distributed photovoltaic is connected to the low-voltage side, faults such as single-phase grounding short-circuit may cause overvoltage problems at the neutral point of the transformer, thereby posing a threat to the insulation at the neutral point. For the main transformer neutral point voltage offset and gap protection problems, this paper first analyzes the fault characteristics of the network, the operation of

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16

AbolqasemiKharanaq, Fatemeh, Amirreza Poorfakhraei, Ali Emadi, and Berker Bilgin. "An Improved Carrier-Based PWM Strategy with Reduced Common-Mode Voltage for a Three-Level NPC Inverter." Electronics 12, no. 5 (2023): 1072. http://dx.doi.org/10.3390/electronics12051072.

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Double modulation wave carrier-based pulse width modulation (CBPWM) is a solution for eliminating the deviations of the neutral-point voltage (NPV) in three-level neutral-point clamped inverters. In this paper, a new hybrid CBPWM strategy is proposed that not only eliminates the neutral-point voltage oscillations but also reduces the common-mode voltage (CMV) by half. Furthermore, the harmonic content is also reduced compared with the available reduced CMV modulation by adjusting the modulation waves based on the location of the reference vector in the space vector diagram. An active neutral-p

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Bogimi, Sirisha. "A grid interconnected nested neutral-point clamped inverter with voltage synchronization using synchronous reference frame controller." International Journal of Applied Power Engineering (IJAPE) 10, no. 4 (2021): 364. http://dx.doi.org/10.11591/ijape.v10.i4.pp364-372.

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<p><span lang="EN-US">Nested neutral-point clamped multi level inverter with inter connection to grid through the synchronous reference frame (SRF) controller for synchronization of voltage to the grid is demonstrated. The system's main feature is that voltage stress in each inverter switching device is kept to a minimum, and redundant inverter switching states are utilised for neutral point and flying capacitor voltage balancing with sinusoidal pulse-width modulation (PWM) technique, synchronisation to grid voltages, and power injection with low harmonic generation. The inverter r

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18

Guo, Xiaoqiang, Xuehui Wang, Ran He, and Mehdi Narimani. "Modeling and Modulation of NNPC Four-Level Inverter for Solar Photovoltaic Power Plant." International Journal of Photoenergy 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/2383872.

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Photovoltaic (PV) power plant is an attractive way of utilizing the solar energy. For high-power PV power plant, the multilevel inverter is of potential interest. In contrast to the neutral-point clamped (NPC) or flying capacitor (FC) multilevel inverter, the nested neutral point clamped (NNPC) four-level inverter has better features for solar photovoltaic power plant. In practical applications, the common mode voltage reduction of the NNPC four-level is one of the important issues. In order to solve the problem, a new modulation strategy is proposed to minimize the common mode voltage. Compar

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19

Drandić, Ana, Ante Marušić, Marino Drandić, and Juraj Havelka. "Power system neutral point grounding." Journal of Energy - Energija 66, no. 1-4 (2022): 52–68. http://dx.doi.org/10.37798/2017661-496.

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The method used for neutral point grounding is very important for power network operation. There are many ways of grounding, which are used in practice, and the decision on the method of neutral grounding depends on the situation in the network connected to the substation. When deciding on the method of neutral grounding it is necessary to thoroughly consider all the advantages and disadvantages of individual modes of neutral grounding, and then choose the best technical and economical solution. This paper analyzes the ways of neutral point grounding in medium voltage networks used in the curr

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20

Zhongfu, Liu, Zhang Junxing, Shi Lixin, and Yang Yaning. "Study on Selective Leakage Protection System of Mine High Voltage Grid Based on Harmonic Phase Comparison." Open Electrical & Electronic Engineering Journal 9, no. 1 (2015): 253–62. http://dx.doi.org/10.2174/1874129001509010253.

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As for the wide application of arc suppression coil to the grounding in neutral point of mine high voltage grid, grid leakage fault rules and harmonic characteristics of the neutral point grounding system through arc suppression coil are analyzed, the selective leakage protection program “zero-sequence voltage starts, fifth harmonics of grid zerosequence voltage and zero-sequence current are extracted for phase comparison” is proposed, and corresponding fifth harmonic extraction circuit and power direction discrimination circuit are designed. The experimental results show that the protective p

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21

SINCHUK, Igor, and Maryna KOTIAKOVA. "STUDY OF NON-SYMMETRICAL MODES OF THREE-PHASE FOUR-WIRE NETWORKS WITH DISTRIBUTED GENERATION." Herald of Khmelnytskyi National University. Technical sciences 313, no. 5 (2022): 233–37. http://dx.doi.org/10.31891/2307-5732-2022-313-5-233-237.

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The use of distributed generation electric energy sources allows efficient use of energy resources, including available renewable energy sources, contributes to the reduction of harmful emissions during traditional electric energy generation, improves the quality of electric energy for consumers and reduces overloading of transmission lines. Meanwhile, if the load supplied by the source of distributed generation is asymmetrical, then the voltage at the zero point of the inverter interface feeding the neutral conductor can deviate quite noticeably from the set level. The easiest way to provide

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22

Shen, Yanxia, Beibei Miao, Dinghui Wu, and Kader Ali Ibrahim. "Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter." Journal of Control Science and Engineering 2018 (February 1, 2018): 1–9. http://dx.doi.org/10.1155/2018/5126404.

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A fault-tolerant control technique is discussed for the Neutral-Point-Clamped (NPC) three-level inverter, which ensures that the NPC inverter operates normally even under device failures. A two-level leg is added to the NPC inverter; when the device open circuit fault occurs, the load of this faulty phase is connected to the neutral point of this two-level leg through the bidirectional thyristors. An improved Space Vector Pulse Width Modulation (SVPWM) strategy called “addition and subtraction substitution SVPWM” is proposed to effectively suppress fluctuation in capacitor neutral-point voltag

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23

Mishra, Nidhi, Shivam Kumar Yadav, Bhim Singh, Sanjeevikumar Padmanaban, and Frede Blaabjerg. "Flying capacitor voltage balance and neutral point voltage regulation of PV array fed active neutral point clamped converter in real-time HIL." IET Power Electronics 13, no. 13 (2020): 2816–23. http://dx.doi.org/10.1049/iet-pel.2019.1144.

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24

Wang, Fei, Zhijun Li, and Xiangrong Tong. "Modified Predictive Control Method of Three-Level Simplified Neutral Point Clamped Inverter for Common-Mode Voltage Reduction and Neutral-Point Voltage Balance." IEEE Access 7 (2019): 119476–85. http://dx.doi.org/10.1109/access.2019.2936611.

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Zhou, Jianyang, Linhai Guan, Kai Zhang, Zhihua Zhang, Liqiang Guo, and Yu Tao. "A High-precision Digital Measurement System Design based on PSR." Journal of Physics: Conference Series 2366, no. 1 (2022): 012044. http://dx.doi.org/10.1088/1742-6596/2366/1/012044.

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Abstract In engineering practice, a constant voltage output control system of synchronous rectifier primary side regulator (PSR) flyback converter is proposed to overcome the sampling defect of the existing digital approximation double line sampling scheme for primary side control synchronous rectifier structure. Regardless of the slope of the sampling waveform and the knee point, the single-output DAC midpoint sampling can achieve high sampling accuracy and good knee point following effect. At the same time, the neutral-point sampling error of the single-output DAC is analyzed, and a sampling

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26

Lee, Kui-Jun. "Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter." Energies 13, no. 6 (2020): 1324. http://dx.doi.org/10.3390/en13061324.

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Since a T-type three-level PWM converter has several intrinsic advantages, it has been researched for various applications such as grid-connected converter systems. However, it necessarily requires an additional voltage control loop for balancing the upper and the lower DC-link voltage. To satisfy this requirement, an offset voltage is widely used to provide a neutral point current without affecting other variables such as total DC-link voltage and three-phase input current. However, these methods are mostly based on the averaged value between the applied offset voltage and the neutral point v

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27

Matislav Majstrović and Hrvoje Olujić. "THE NEUTRAL CONDUCTOR VOLTAGE IN A MEDIUMVOLTAGE NETWORK DURING A GROUND FAULT." Journal of Energy - Energija 57, no. 3 (2022): 328–49. http://dx.doi.org/10.37798/2008573327.

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Of all the ground faults that can occur in medium-voltage networks from the standpoint of human and equipment safety, the most problematic is a ground fault in a medium-voltage/low-voltage substation. The grounding system of a lowvoltage network is directly connected to the grounding electrode of the substation. Therefore, each increase in the potential of the grounding electrode of the substation is transmitted directly via the neutral conductor into the customer’s installation. For these reasons, in this article a detailed investigation is presented of the problem of determining the neutral

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Aravindan, M., V. Balaji, V. Saravanan, and M. Arumugam. "Neutral point clamped quasi Z source inverter for photovoltaic systems." International Journal of Applied Power Engineering (IJAPE) 8, no. 3 (2019): 277. http://dx.doi.org/10.11591/ijape.v8.i3.pp277-286.

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<p>Multilevel inverters are becoming popular for power conversion in renewable energy systems, AC-DC hybrid micro grids etc. The voltage stress and inrush current through these inverter leg switches are quite higher as compared to the load ratings which increase the chances of inverter leg switch failure. A three level neutral point clamped quasi Z source inverter topology is discussed in this paper which has the features of lower component count, reduced capacitor voltage stress, and it can be operated at different control strategies to achieve wide range of voltage boosting ability, su

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S, Chitra, Jayakumar J, Venkateshkumar P, Shanty Chacko, and Sivabalan. "Identification of Power Leakage and Protection of Over Voltage in Residential Buildings." International Journal of Electrical and Electronics Research 10, no. 1 (2022): 51–56. http://dx.doi.org/10.37391/ijeer.100107.

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In many residential buildings the electrical wires of individual houses are laid in the same conduit pipe and some mistakes could be made in identifying similar coloured wires when they are laid in same conduit pipe. Most of the faults are caused by the neutral interconnection in the wiring system. Usually neutral wires are connected to neutral bus within the panel board or switchboard, and are "bonded" to earth ground. In our secondary distribution, tree system of supply is mostly utilized. The voltage of each phase to neutral will be maintained at rated value even during the unbalanced load

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Cho, Ja-Hwi, Nam-Joon Ku, Seok-Eon Joung, and Dong-Seok Hyun. "A Small Signal Modeling of Three-level Neutral-Point-Clamped Inverter and Neutral-Point Voltage Oscillation Reduction." Transactions of the Korean Institute of Power Electronics 19, no. 5 (2014): 407–14. http://dx.doi.org/10.6113/tkpe.2014.19.5.407.

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Orfanoudakis, Georgios I., Michael A. Yuratich, and Suleiman M. Sharkh. "Hybrid Modulation Strategies for Eliminating Low-Frequency Neutral-Point Voltage Oscillations in the Neutral-Point-Clamped Converter." IEEE Transactions on Power Electronics 28, no. 8 (2013): 3653–58. http://dx.doi.org/10.1109/tpel.2012.2231883.

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Chen, Kewei, Weidong Jiang, and Peixia Wang. "An Extended DPWM Strategy With Unconditional Balanced Neutral Point Voltage for Neutral Point Clamped Three-Level Converter." IEEE Transactions on Industrial Electronics 66, no. 11 (2019): 8402–13. http://dx.doi.org/10.1109/tie.2018.2885735.

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Zhu, Qinyue, Wei Dai, Lei Guan, Xitang Tan, Zhaoyang Li, and Dabo Xie. "A Fault-Tolerant Control Strategy of Modular Multilevel Converter with Sub-Module Faults Based on Neutral Point Compound Shift." Energies 12, no. 5 (2019): 876. http://dx.doi.org/10.3390/en12050876.

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In view of the complex calculation and limited fault tolerance capability of existing neutral point shift control algorithms, this paper studies the fault-tolerant control method for sub-module faults in modular multilevel converters on the basis of neutral point compound shift control strategy. In order to reduce the calculation complexity of shift parameters in the traditional strategy and simplify its implementation, an improved AC side phase voltage vector reconstruction method is proposed, achieving online real-time calculation of the modulation wave adjustment parameters of each phase re

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Kang, Kyoung-Pil, Younghoon Cho, Ho-Sung Kim, and Ju-won Baek. "DC-Link Capacitor Voltage Imbalance Compensation Method Based Injecting Harmonic Voltage for Cascaded Multi-Module Neutral Point Clamped Inverter." Electronics 8, no. 2 (2019): 155. http://dx.doi.org/10.3390/electronics8020155.

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In a three-level (NPC) converter, the voltage imbalance problem in the DC-link capacitors is major issue. This paper proposes the DC-link capacitor voltage imbalance compensation method, where a common offset voltage is injected for a multi-module NPC inverter. The offset voltage consists of a harmonic voltage and a voltage difference between the upper and lower capacitors. The proposed method does not require any hardware modification, so that it is easily implemented. In order to show the effectiveness of the proposed balancing method, theoretical analysis is provided to balance the voltages

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Akbari, Ehsan, and Farhad Zishan. "Modified Topology and Modulation Technique for Z-Source Neutral-Point Clamped Inverter." Power Electronics and Drives 7, no. 1 (2022): 210–26. http://dx.doi.org/10.2478/pead-2022-0016.

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Abstract The impedance network makes it possible to increase and decrease the voltage, which is not available in normal inverters (voltage and current sources).This paper presents a modified topology and modulation technique for a three-phase Modified Z-Source Neutral-Point Clamped (MZS-NPC) inverter. A modulation scheme for the proposed topology is designed based on maximum gain control method to achieve the maximum voltage gain by simple implementation and balancing the neutral point voltage of the dc link. In order to supply the desired voltage to the critical load in an islanded micro-grid

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Narasimha Raju, Kuthuri, Chandra Sekhar Obbu, and Ramamoorthy M. "Appropriate Switching State Selection to Avoid Sapacitor Imbalance in Five-Level NPC." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 1 (2018): 276. http://dx.doi.org/10.11591/ijpeds.v9.i1.pp276-285.

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<p>An intrinsic problem with neutral point clamped (NPC) multilevel inverters (MLI) is unbalance of capacitor voltage. There are many mitigation techniques well established in the literature to balance the neutral point voltage for 3-level inverter. These techniques employ either Carrier based pulse width modulation (CBPWM), Space vector pulse width modulation (SVPWM) or hybrid of both the PWM techniques. Balancing becomes complicated as the level of the inverter increases due to addition of capacitor junctions. The imbalance in capacitor voltages may cause uneven voltage distribution am

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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 (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

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Yue, Yun Tao, and Zhi Yong Xu. "Research on Neutral-Point Balancing for Three-Level Space Voltage Vector Converter." Advanced Materials Research 748 (August 2013): 473–76. http://dx.doi.org/10.4028/www.scientific.net/amr.748.473.

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A novel hybrid clamped dual-PWM three-level converter topology is proposed for induction motor drives in this paper. The switching states of hybrid clamp three-level converters increase to sixty-four from twenty-seven switching states of diode clamp three-level converters. In order to realize optimization of its redundant voltage space vectors by detecting voltage of clamp capacitor and difference of capacitor voltage in DC side, Generating an optimized switching pattern, The hybrid clamped three-level converter increases the voltage levels number, reducing the harmonics associated to the comm

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Xiang, Chao-Qun, Cheng Shu, Ding Han, Bing-Kui Mao, Xun Wu, and Tian-Jian Yu. "Improved Virtual Space Vector Modulation for Three-Level Neutral-Point-Clamped Converter With Feedback of Neutral-Point Voltage." IEEE Transactions on Power Electronics 33, no. 6 (2018): 5452–64. http://dx.doi.org/10.1109/tpel.2017.2737030.

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NGUYỄN, Nhờ Văn, and HONG-PHONG NGUYEN LE. "A study on performances of carrier-based pulse-width modulation techniques for three-phase three-level t-type neutral-point-clamped inverter under switch-open-circuit fault on two neutral-point-connected legs." Science & Technology Development Journal - Engineering and Technology 3, no. 3 (2020): first. http://dx.doi.org/10.32508/stdjet.v3i3.659.

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Multilevel voltage source inverters (VSIs) have been used for several decades thanks to their advantages compared with traditional two level VSI. Among various types of multilevel configuration, the T-type neutral-point-clamped VSI (3L TNPC VSI or 333-type VSI) has gained the attention in recent years. Due to the unique structure, the 333-type VSI has critical issues in reliability in operation such as switch-open-circuit (SOC) and switch-short-circuit (SSC), which lead to several unrequired issues, for instance, reduction of system performance, distorted and unbalanced output voltages and cur

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Han, Gang, Jian Wen Zhang, and Xu Cai. "Study on Experimental System for Three Level Neutral-Point-Clamped Converter." Advanced Materials Research 986-987 (July 2014): 1858–63. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1858.

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This paper focuses on the digital experimental system for neutral-point-clamped three-level converter. First, SVM’s digital implementation method is studied. As neutral-point voltage unbalance is an inherent problem for this topology, a practical capacitor voltage balance method is present. This method uses a variable factor as the small vectors’ adjustment coefficient, which is calculated by PI controller with capacitor voltage deviation. Then, a digital modular control system is proposed, in which both hardware and software system structures are designed in modular. The digital control syste

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Lyu, Mingzhe, Chenxi Man, and Tinglian Zhou. "Mid-point potential balancing in three-level inverters." Journal of Physics: Conference Series 2479, no. 1 (2023): 012023. http://dx.doi.org/10.1088/1742-6596/2479/1/012023.

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Abstract Three-level inverters are among the best options for high voltage and high-power applications because of their high capacity, high rated voltage, low harmonic content of the output current, and minimal switching losses. However, the issue with mid-point voltage balancing is an inherent drawback of three-level inverters. The unbalanced mid-point voltage of a three-level inverter leads to low harmonics in the output voltage, causing voltage distortion and seriously reducing the power quality. The unbalanced mid-point voltage also puts more voltage strain on the DC bus side and power swi

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Thuyen, Chau Minh, Nguyen Hoai Thuong, and Truong Khac Tung. "Integrated compensation model using a three-phase neutral point clamped inverter." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 5 (2020): 5074. http://dx.doi.org/10.11591/ijece.v10i5.pp5074-5082.

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Normally, when research on active compensation models, previous studies only assumed that the source of harmonics is nonlinear load. The nonlinear load here is fixed and balanced, the supply voltage is considered ideal, i.e. the three-phase source is balanced and there is no distortion. However, in reality, the above assumption is difficult to achieve. Therefore, this paper aims to design an integrated compensation model for different types of harmonic sources. The types of harmonic sources considered here include: harmonic sources generated from nonlinear load and source. The requirement of t

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Ali, Hassan. "DC voltage balancing for neutral point clamped active PWM converter." International Journal of Industrial Electronics and Drives 2, no. 4 (2015): 213. http://dx.doi.org/10.1504/ijied.2015.076275.

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Oh, W. S., S. K. Han, and G. W. Moon. "PWM switched voltage source inverter with zero neutral point potential." Electronics Letters 40, no. 12 (2004): 767. http://dx.doi.org/10.1049/el:20040448.

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Xiaoming Yuan and I. Barbi. "Zero-voltage switching for the neutral-point-clamped (NPC) inverter." IEEE Transactions on Industrial Electronics 49, no. 4 (2002): 800–808. http://dx.doi.org/10.1109/tie.2002.801064.

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Almamoori, Nawres Ali, Bogdan Dziadak, and Ahmad H. Sabry. "Design of a closed-loop autotune PID controller for three-phase for power factor corrector with Vienna rectifier." Bulletin of Electrical Engineering and Informatics 11, no. 4 (2022): 1798–806. http://dx.doi.org/10.11591/eei.v11i4.3728.

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A closed-loop auto-tuner proportional integral derivative (PID) controller for tuning the DC-link voltage, voltage neutral controllers, and DQ axis current for a power factor corrector with Vienna rectifier is developed and discussed in this study. In traditional tuning of these control loops, it is needed to tune one loop at a time manually, which tends to be a difficult and time-consuming process. In this work, we add a closed-loop PID auto-tuner in the control design will help to simplify and speed up this process by tuning all the 4 PID controllers in a single simulation running in a close

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Jiang, Weidong, Peidong Wang, Mingna Ma, et al. "A Novel Virtual Space Vector Modulation With Reduced Common-Mode Voltage and Eliminated Neutral Point Voltage Oscillation for Neutral Point Clamped Three-Level Inverter." IEEE Transactions on Industrial Electronics 67, no. 2 (2020): 884–94. http://dx.doi.org/10.1109/tie.2019.2899564.

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Xun, Zhuyu, Hongfa Ding, and Zhou He. "A Novel Switched-Capacitor Inverter with Reduced Capacitance and Balanced Neutral-Point Voltage." Electronics 10, no. 8 (2021): 947. http://dx.doi.org/10.3390/electronics10080947.

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A novel three-phase switched-capacitor multilevel inverter (SCMLI) with reduced capacitance and balanced neutral-point voltage is proposed in this paper. Applying only one DC source, the three-phase seven-level topology possessing voltage-boosting capability is accomplished without the high-voltage stress of power switches. Owing to the inherent redundant switching states of the proposed topology, two charging approaches that can effectively limit the voltage ripples and path selection for capacitors can be realized. This provides the presented topology with reduced capacitance, balanced neutr

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Wang, Qing Hao, Zi Jun Huang, Zhi Gang Li, Bo Fang, and Gui Bin Hu. "10kV Grid Arc Grounding Over-Voltage Hazards and Countermeasures." Applied Mechanics and Materials 392 (September 2013): 489–93. http://dx.doi.org/10.4028/www.scientific.net/amm.392.489.

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Through the analysis of 2 single-phase grounding over voltage accidents caused by capacitive over current in 10 kV power grid in this paper, the causes and damages of arc grounding over voltage are illustrated, and the necessity of capacitive current test and effective methods are pointed out. The test and assessment to the 29 substations capacitor currents provides a scientific basis for the correct selection of the neutral point operation mode, and the strengths and weaknesses of the neutral Point grounding through the arc suppression circle and the mode trends of 10kV grid neutral grounding

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