research on the neutral-point voltage balance for npc three-level inverters under non-ideal grid conditions
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ID: 145891
2018
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Abstract
In order to solve the neutral-point voltage unbalancing problem for neutral-point clamped (NPC) three-level inverters under non-ideal grid conditions, a novel zero-sequence component injection method for modulation signals was proposed in this paper. Based on the mathematical expressions of neutral-point voltage unbalancing, the fluctuation of the neutral-point voltage under different grid conditions was studied. The proposed method dynamically calculates the zero-sequence component for modulation signals by region selections based on sinusoidal pulse width modulation (DCR-SPWM). Under non-ideal grid conditions, this DCR-SPWM method can control the neutral-point voltage balance for NPC three-level inverters with different grid and output power conditions, and improves the grid current quality. The simulation results verified the correctness of the theoretical analysis in this paper, and the feasibility and effectiveness of this method were verified by the experiments in the experimental platform of the NPC three-level grid-connected inverter based on DSP-CPLD controllers.
| Reference Key |
lyu2018energiesresearch
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|---|---|
| Authors | ;Jian Guo Lyu;Ji Dong Wang;Wen Bin Hu;Zhao Feng Wu |
| Journal | acs combinatorial science |
| Year | 2018 |
| DOI |
10.3390/en11061331
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| URL | |
| Keywords | Keywords not found |
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