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由于链式静止同步补偿器 (STATCOM )直流电容器各自独立 ,如何使这些电容器上的电压保持一致 ,是装置安全可靠运行需要解决的关键问题。而电容电压不平衡机理的研究则是制定电压平衡控制策略的基础。文中通过数字仿真和物理模型试验进行相互比较 ,研究了各种因素对电容电压分配的影响 ,指出开关脉冲延时不同、混合型损耗差异以及并联型损耗差异是造成电容电压不平衡的主要原因。其研究结果对于建立链式STATCOM数学模型 ,从而定量分析电容电压的不平衡程度 ,进而制定合理的平衡控制策略具有重要意义
Since the STATCOM DC capacitors are independent of each other, how to keep the voltage across these capacitors consistent is a key issue that needs to be addressed in order to operate the device safely and reliably. The research on the mechanism of unbalanced capacitor voltage is the basis for the development of voltage balance control strategy. In this paper, the effects of various factors on the capacitor voltage distribution are studied through digital simulation and physical model tests. It is pointed out that different switching delay, mixed loss and parallel loss are the main causes of unbalanced capacitor voltage. The results of this study are of great significance to establish a mathematical model of chain STATCOM to quantitatively analyze the imbalance of capacitor voltage and then to develop a reasonable balance control strategy