| 引用本文: | 谭兴国,王辉,张黎,李庆民,邹亮.具有电压补偿的四开关并网逆变器等效SVPWM控制方法[J].电力系统保护与控制,2014,42(1):1-8.[点击复制] |
| TAN Xing-guo,WANG Hui,ZHANG Li,LI Qing-min,ZOU Liang.An equivalent SVPWM control method with voltage compensation for four-switch inverter[J].Power System Protection and Control,2014,42(1):1-8[点击复制] |
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| 摘要: |
| 针对三相四开关并网逆变器因直流母线中点偏移引起的逆变器输出不平衡问题，采用逆变器输出等效电路分析的方法，指出电源阻抗差异是造成四开关逆变器三相输出不平衡的内在原因。在对比分析SVPWM与三角波调制方法基础上，依据矢量合成等效原理，提出可等效SVPWM的改进三角波调制方法。给出了具有直流中点偏移电压补偿的参考值生成策略。仿真结果表明，该方法实现简单，既可有效抑制因直流中点电压偏移引起的三相四开关输出不平衡问题，又能抑制因参数差异引起的输出不均衡问题。 |
| 关键词: 三相四开关逆变器 中点电压不平衡 电压补偿 阻抗等效 等效SVPWM |
| DOI：10.7667/j.issn.1674-3415.2014.01.001 |
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| 基金项目:国家自然科学基金资助项目（51107068）；中国博士后基金（2012M511023）；新能源电力系统国家重点实验室开放课题（LAPS13017） |
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| An equivalent SVPWM control method with voltage compensation for four-switch inverter |
| TAN Xing-guo1,2,WANG Hui2,ZHANG Li2,LI Qing-min3,ZOU Liang2 |
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| Abstract: |
| DC bus midpoint voltage excursion of four-switch three-phase (FSTP) inverter leads to its output imbalance. Based on FSTP equivalent circuit analysis, it concludes that power supply impedance difference is the internal cause of FSTP output imbalance. To get a better control of FSTP inverter, according to vector synthesis equivalence principle, an improved triangular wave modulation PWM method is proposed to replace SVPWM. To solve the output imbalance problem in FSTP inverter, a voltage reference generation method with DC bias compensation is brought forward. Simulation results show that both output imbalance problems caused by DC midpoint offset and parameter difference can be effectively inhibited, and it is easy to implement. |
| Key words: four-switch three-phase inverter imbalance of DC midpoint voltage voltage compensation equivalent impendence equivalent SVPWM method |
