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A Capacitor Voltage Balancing Scheme for a Single-Phase Cascaded H-Bridge STATCOM

机译:单相级联H桥STATCOM的电容器电压平衡方案

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This paper investigates the individual DC capacitor voltage balancing algorithm of a single-phase cascaded H-bridge (CHB) STATCOM. The main purpose of STATCOM connected to the grid is to inject or absorb the reactive power but in the process, it draws active power also to meet the losses in the system. The losses accrued in the H-bridges are uneven because of asymmetries in the modules or because the switching and conduction losses are different in the H-bridges. The individual balancing algorithm equalizes reactive power among the H-bridges but the active power remains unequal in different H-bridges. A combination of PLL and Fourier series method is used to extract the phase information as well as coordinate transformations. The entire system is modeled by an MATLAB-SIMULINK environment with the switching losses represented by using a resistive load across the DC capacitors.
机译:本文研究了单相级联H桥(CHB)STATCOM的单个直流电容器电压平衡算法。 STATCOM并网的主要目的是注入或吸收无功功率,但在此过程中,它也会吸收有功功率,以弥补系统中的损耗。由于模块中的不对称性,或者由于H桥中的开关损耗和传导损耗不同,H桥中产生的损耗是不均匀的。单独的平衡算法使H桥之间的无功功率相等,但是有功功率在不同的H桥中保持不相等。 PLL和傅里叶级数方法的组合用于提取相位信息以及坐标变换。整个系统由MATLAB-SIMULINK环境建模,其开关损耗由跨DC电容器的电阻性负载表示。

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