Research and application of 1140V 500KVA STATCOM based on three-level converter

2014 International Power Electronics and Application Conference and Exposition Pub Date : 2014-11-01 DOI:10.1109/PEAC.2014.7038046

Junjie Li, Jianguo Jiang, Chunxiao Zhu, Yunlong Liu

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Abstract

Static synchronous compensator (STATCOM) based on three-level neutral point clamped (NPC) converter is presented. A simple equivalent circuit of three-level converter is analyzed to predict the deviation of node voltages, and the capacitor voltage imbalance mechanism of three-level NPC converter is analyzed. An optimization algorithm of space vector pulse width modulation ( SVPWM ) for capacitor voltage balance of three-level NPC converter is presented. This algorithm predicts the deviation of node voltages for different operation modes to develop an optimization algorithm to minimize the voltage deviation among different capacitors. This algorithm selects the best switch combinations during each switching cycle to reach node voltage balance. In addition, the three-segment switching sequence design is presented in order to reduce the switching losses. 1140V 500kVA STATCOM based on three-level NPC converter is built and applied. Experimental results verify the compensate performance of STATCOM based on three-level converter and indicate the validity of the optimization SVPWM algorithm for capacitor voltage balance.

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基于三电平变换器的1140V 500KVA STATCOM的研究与应用

提出了一种基于三电平中性点箝位(NPC)变换器的静态同步补偿器。分析了一种简单的三电平变换器等效电路来预测节点电压偏差，分析了三电平NPC变换器电容电压不平衡机理。提出了一种用于三电平NPC变换器电容电压平衡的空间矢量脉宽调制优化算法。该算法通过对不同运行模式下节点电压偏差的预测，提出一种最小化不同电容之间电压偏差的优化算法。该算法在每个开关周期内选择最佳的开关组合，以达到节点电压平衡。此外，为了降低开关损耗，提出了三段开关序列设计。建立并应用了基于三电平NPC变换器的1140V 500kVA STATCOM。实验结果验证了基于三电平变换器的STATCOM补偿性能，表明了优化SVPWM算法用于电容电压平衡的有效性。

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2014 International Power Electronics and Application Conference and Exposition

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