Neutral-Point Potential Balancing Control Strategy for Three-Level ANPC Converter Using SHEPWM Scheme

Yunlei Zhang, Cungang Hu, Qunjing Wang, Yufei Zhou and Yue Sun
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Yunlei Zhang: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
Cungang Hu: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
Qunjing Wang: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
Yufei Zhou: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
Yue Sun: School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China

Energies, 2019, vol. 12, issue 22, 1-16

Abstract: A selective harmonic elimination pulse width modulation (SHEPWM) control strategy is proposed to balance the neutral-point potential (NP) of a three-level active neutral-point-clamped (ANPC) converter. In this strategy, the chaotic ant colony algorithm (ACA) is adopted to solve the SHEPWM nonlinear equations, which does not require presetting the initial values of solutions and can get multiple solutions in the same modulation index. The influence of different solutions corresponding to the SHEPWM switching states on the NP is different, namely, some make the NP increase and others make the NP decrease. Therefore, the NP balancing can be effectively controlled by choosing appropriate solutions in different fundamental periods. The simulation and experimental results further verify the feasibility and effectiveness of the control strategy.

Keywords: active neutral-point-clamped; neutral-point-clamped converters; elective harmonic elimination; neutral-point potential balancing; ant colony algorithm (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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