An improved CB-DPWM strategy with NP voltage balance and switching loss reduction for 3-L NPC converter
-
Bingyu Li
,
Hui Fan
Abstract
The three-level (3-L) neutral-point-clamped (NPC) converter has found widespread applications in various fields, due to its simple structure, low failure rate and high efficiency. However, the 3-L NPC converter suffers the issue of unbalanced neutral-point (NP) voltage due to the divided two dc-side capacitors. The large NP voltage ripple and offset Based on the detailed analysis of the effects of vectors and clamping patterns on the NP voltage, a discontinuous optimized modulation method for NPC grid-connected inverter with both low switching loss and ability to balance NP voltage is presented. By measuring NP voltage and utilizing the property that superfluous clamping patterns have opposing effects on the NP voltage, the modulation method adjusts the NP voltage with the injection of various zero sequence voltages (ZSV) into the original sinusoidal waves. The results of this study demonstrate that the CB-DPWM can control the NP voltage balanced and decrease switching loss compared to conventional DPWM and SVPWM strategies. Moreover, the CB-DPWM strategy does not need to identify sectors and subsectors or calculate dwelling times. This modulation strategy effectively suppresses low-frequency fluctuations and deviations of the NP voltage with the injection of a simple ZSV, and improves the power quality of the output voltages and currents. Compared to the traditional SVPWM scheme, the suggested CB-DPWM has a 27 % lower overall IGBT loss. Moreover, this method is implemented through carrier waves, which is simpler than modulation schemes based on space vector, greatly shortens the program running time, and is conducive to engineering implementation.
-
Research ethics: Not applicable.
-
Author contributions: Bingyu Li: Methodology, Software, Validation. Xuhao Du: Writing – Original Draft, Writing – Review & Editing. Hui Fan: Visualization. Xianhai Pang: Project administration.
-
Competing interests: The author(s) state(s) no conflict of interest.
-
Research funding: Science and Technology Project of State Grid Hebei Electric Power Company (kj2023-081).
-
Data availability: The raw data can be obtained on request from the corresponding author.
References
1. Tang, X, Tang, Y, Xu, Y. Suppression strategy for midpoint potential fluctuation of three-level wind power converter. IEEE Trans Power Electron 2022;37:2583–92. https://doi.org/10.1109/TPEL.2021.3109461.Search in Google Scholar
2. Schettino, G, Nevoloso, C, Miceli, R, Tommaso, AOD, Viola, F. Impact evaluation of innovative selective harmonic mitigation algorithm for cascaded H-bridge inverter on IPMSM drive application. IEEE Open J Ind Appl 2021;2:347–65. https://doi.org/10.1109/OJIA.2021.3130288.Search in Google Scholar
3. Chen, F, Qiao, W, Wang, H, Qu, L. A simple zero-sequence voltage injection method for carrier-based pulsewidth modulation of the three-level NPC inverter. IEEE J Emerg Sel Top Power Electron 2021;9:4687–99. https://doi.org/10.1109/JESTPE.2020.3012726.Search in Google Scholar
4. Weidong, J, Wang, L, Wang, J, Zhang, X, Wang, P. A carrier-based virtual space vector modulation with active neutral-point voltage control for a neutral-point-clamped three-level inverter. IEEE Trans Ind Electron 2018;65:8687–96. https://doi.org/10.1109/TIE.2018.2808926.Search in Google Scholar
5. Xiang, C -Q, Shu, C, Han, D, Mao, B -K, Wu, X, Yu, T -J. Improved virtual space vector modulation for three-level neutral-point-clamped converter with feedback of neutral-point voltage. IEEE Trans Power Electron 2018;33:5452–64. https://doi.org/10.1109/TPEL.2017.2737030.Search in Google Scholar
6. Yan, Q, Zhou, Z, Wu, M, Yuan, X, Zhao, R, Xu, H. A simplified analytical algorithm in abc coordinate for the three-level SVPWM. IEEE Trans Power Electron 2021;36:3622–7. https://doi.org/10.1109/TPEL.2020.3027742.Search in Google Scholar
7. Liu, T, Chen, A, Qin, C, Chen, J, Li, X. Double vector model predictive control to reduce common-mode voltage without weighting factors for three-level inverters. IEEE Trans Ind Electron 2020;67:8980–90. https://doi.org/10.1109/TIE.2020.2994876.Search in Google Scholar
8. Beniwal, N, Townsend, CD, Farivar, GG, Pou, J, Ceballos, S, Tafti, HD. Band-limited three-level modulation for balancing capacitor voltages in neutral-point-clamped converters. IEEE Trans Power Electron 2020;35:9737–52. https://doi.org/10.1109/TPEL.2020.2969452.Search in Google Scholar
9. Xiong, W, Zhu, X, Lin, J, Xie, S, Sun, Y, Liu, Y, et al.. An algebraic modulation strategy for 3L-NPC converters with inherent neutral-point voltage balance capability. IEEE Trans Power Electron 2022;37:7533–9. https://doi.org/10.1109/TPEL.2022.3145949.Search in Google Scholar
10. Zhong, L, Hu, S. Reference voltage self-equalization-based modulation strategy for open-end winding PMSM fed by dual three-level inverters with common DC bus. IEEE J Emerg Sel Top Power Electron 2022;10:196–206. https://doi.org/10.1109/JESTPE.2021.3069351.Search in Google Scholar
11. Barros, JD, Silva, JFA, Jesus, ÉGA. Fast-predictive optimal control of NPC multilevel converters. IEEE Trans Ind Electron 2013;60:619–27. https://doi.org/10.1109/TIE.2012.2206352.Search in Google Scholar
12. Zhang, Z, Thomsen, OC, Andersen, MAE. Discontinuous PWM modulation strategy with circuit-level decoupling concept of three-level neutral-point-clamped (NPC) inverter. IEEE Trans Ind Electron 2013;60:1897–906. https://doi.org/10.1109/TIE.2012.2227901.Search in Google Scholar
13. Hashempour, MM, Yang, M -Y, Lee, T -L. An adaptive control of DPWM for clamped-three-level photovoltaic inverters with unbalanced neutral-point voltage. IEEE Trans Ind Appl 2018;54:6133–48. https://doi.org/10.1109/TIA.2018.2849062.Search in Google Scholar
14. Choi, U -M, Blaabjerg, F, Lee, K -B. Control strategy of two capacitor voltages for separate MPPTs in photovoltaic systems using neutral-point-clamped inverters. IEEE Trans Ind Appl 2015;51:3295–303. https://doi.org/10.1109/TIA.2015.2399611.Search in Google Scholar
15. Yan, Q, Xiao, L, Chen, H, Yuan, X, Xu, H, Zhao, R. An analytical discontinuous space-vector PWM for three-level inverters with unbalanced dc-side voltages. IEEE Trans Power Electron 2022;37:7718–28. https://doi.org/10.1109/TPEL.2022.3146277.Search in Google Scholar
16. Ding, W, Zhang, C, Gao, F, Duan, B, Qiu, H. A zero-sequence component injection modulation method with compensation for current harmonic mitigation of a Vienna rectifier. IEEE Trans Power Electron 2019;34:801–14. https://doi.org/10.1109/TPEL.2018.2812810.Search in Google Scholar
17. Giri, SK, Chakrabarti, S, Banerjee, S, Chakraborty, C. A carrier-based PWM scheme for neutral point voltage balancing in three-level inverter extending to full power factor range. IEEE Trans Ind Electron 2017;64:1873–83. https://doi.org/10.1109/TIE.2016.2624721.Search in Google Scholar
18. Wu, X, Tan, G, Ye, Z, Yao, G, Liu, Z, Liu, G. Virtual-space-vector PWM for a three-level neutral-point-clamped inverter with unbalanced dc-sides. IEEE Trans Power Electron 2018;33:2630–42. https://doi.org/10.1109/TPEL.2017.2692272.Search in Google Scholar
© 2024 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Research Articles
- Improving islanded distribution system stability with adaptive decision-making framework
- Sensorless control method of induction motors with new feedback gain matrix and speed adaptive law for low speed range
- An improved CB-DPWM strategy with NP voltage balance and switching loss reduction for 3-L NPC converter
- Single-ended protection scheme for three-terminal hybrid DC transmission system based on refractive coefficients
- Long-distance transmission conductor condition sensing based on distributed fiber optic sensing technology
- Data integrity cyber-attack mitigation using linear quadratic regulator based load frequency control in hybrid power system
- Investigation of DG units influence on 66 kV sub-transmission system network considering region load growth: a case study
- Influence of increasing Integration of Solar photovoltaic on Small Signal and Transient stability of Nigeria Power System
- Implementation of SOC-based power management algorithm in a grid-connected microgrid with hybrid energy storage devices
- Experimental studies on insulating oils for power transformer applications
- Power distribution system restoration based on soft open points and islanding by distributed generations
- Power coordination and control of DC Microgrid with PV and hybrid energy storage system
- An investigation on NGR failure in Indian smart cities while replacing the existing overhead lines by underground cables
Articles in the same Issue
- Frontmatter
- Research Articles
- Improving islanded distribution system stability with adaptive decision-making framework
- Sensorless control method of induction motors with new feedback gain matrix and speed adaptive law for low speed range
- An improved CB-DPWM strategy with NP voltage balance and switching loss reduction for 3-L NPC converter
- Single-ended protection scheme for three-terminal hybrid DC transmission system based on refractive coefficients
- Long-distance transmission conductor condition sensing based on distributed fiber optic sensing technology
- Data integrity cyber-attack mitigation using linear quadratic regulator based load frequency control in hybrid power system
- Investigation of DG units influence on 66 kV sub-transmission system network considering region load growth: a case study
- Influence of increasing Integration of Solar photovoltaic on Small Signal and Transient stability of Nigeria Power System
- Implementation of SOC-based power management algorithm in a grid-connected microgrid with hybrid energy storage devices
- Experimental studies on insulating oils for power transformer applications
- Power distribution system restoration based on soft open points and islanding by distributed generations
- Power coordination and control of DC Microgrid with PV and hybrid energy storage system
- An investigation on NGR failure in Indian smart cities while replacing the existing overhead lines by underground cables
