Research on the impact of transformer DC bias on PV grid-connected inverter and restraining method

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作者：
机构：
[1] Wang, Xiang
[2] Hao, Ruixiang
[3] Wang, Jian
来源：
Wang, X. | 1600年 / China Machine Press卷 / 28期
关键词：
Electric inverters;
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摘要：
DC bias of transformer will cause excitation current remarkably distorted. The output of PV grid-connected inverter with fundamental-frequency isolation is affected by the DC bias of transformer seriously. Therefore, it's necessary to eliminate the DC component of the inverter output current when designing the control strategy. A method of current control based on the proportion- integration-resonance(PIR) control is presented for zero steady state DC output. The experimental results show the validity of the control strategy.
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