Analysis of the DC-link capacitor voltage spectrum in the cascaded multilevel STATCOM
Analysis of the DC-link capacitor voltage spectrum in the cascaded multilevel STATCOM
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DOI：
10.1109/icit.2008.4608454
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
Zhang Botao;N. Ziling;Li Bei;Zhang Liping
中科院分区：
文献类型：
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作者：
Zhang Botao;N. Ziling;Li Bei;Zhang Liping
给出了级联多电平STATCOM中直流链路电容电压谱的一般表达式，用于预测交流电源电压和电流平衡后产生的电压谐波分量的幅值和频率。计算采用开关函数方法，将直流链路电流、SPWM控制脉冲和输出交流电流联系起来。特别对2次谐波进行了详细的讨论。考虑到电压纹波，给出了所需的电容值和电压参考值。
A general expression for the spectrum of the DC-link capacitor voltage in the cascaded multilevel STATCOM is presented, and to predict the amplitude and frequency of the voltage harmonic components produced by balanced AC power voltage and current. The computation is developed using the switching functions approach, relating DC-link current, SPWM control pulse and the output AC current. Especially, the 2-th voltage harmonic is discussed in detail. Consideration of the voltage ripple, the required capacitance value and the voltage reference value are presented.