Neutral-point voltage balancing method for three-phase four-leg three-level ANPC inverter based on modulation waveform splitting

A neutral-point (NP) voltage balancing method based on modulation wave splitting is proposed for a three-phase four-leg (3P4L) three-level (3L) active NP clamped (ANPC) inverter. According to the principle of changing the NP current by adjusting the o-state duty cycle, the NP current injected by eac...

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Published in:Journal of physics. Conference series 2024-12, Vol.2918 (1), p.012013
Main Authors: Zhang, Hengkang, Wang, Fusheng, Liu, Guorui, Wu, Wei, Zuo, Qingfeng
Format: Article
Language:English
Subjects:
Balancing
Current carriers
Electric potential
Inverters
Modulation
Splitting
Voltage
Waveforms
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Wang, Fusheng
Liu, Guorui
Wu, Wei
Zuo, Qingfeng
description A neutral-point (NP) voltage balancing method based on modulation wave splitting is proposed for a three-phase four-leg (3P4L) three-level (3L) active NP clamped (ANPC) inverter. According to the principle of changing the NP current by adjusting the o-state duty cycle, the NP current injected by each carrier period is made zero by splitting the modulation waveforms of the mid-phase and N-phase. This approach eliminates low-frequency fluctuation in NP voltage under various load conditions. On this basis, according to the inverter operating state and limiting conditions, the output o-state duty cycle of the modulation wave for the intermediate phase and N-phase is adjusted to suppress the NP voltage deviation caused by various non-ideal factors. Finally, the effectiveness of the method is verified through simulation.
doi_str_mv 10.1088/1742-6596/2918/1/012013
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subjects Balancing
Current carriers
Electric potential
Inverters
Modulation
Splitting
Voltage
Waveforms
title Neutral-point voltage balancing method for three-phase four-leg three-level ANPC inverter based on modulation waveform splitting
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