Control and Performance of a Transformerless Cascade PWM STATCOM With Star Configuration
Control and Performance of a Transformerless Cascade PWM STATCOM With Star Configuration
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DOI：
10.1109/tia.2007.900487
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发表时间：
2007-07
影响因子：
4.4
通讯作者：
Hirofumi Akagi;S. Inoue;T. Yoshii
中科院分区：
文献类型：
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作者：
Hirofumi Akagi;S. Inoue;T. Yoshii
本文介绍了一种适用于工业和公用电网配电系统的三相无变压器级联脉宽调制（PWM）静止同步补偿器（STATCOM）。文中提出了一种控制算法，该算法不仅致力于满足无功功率需求，还能实现多个电气隔离且悬浮的直流电容器的电压平衡。基于移相载波调制策略的该控制算法，其显著优点是对级联数量没有限制。实验波形验证了，一台200伏、10千伏安的星形连接级联PWM STATCOM，在额定无功功率10千伏安下，能够在20毫秒内实现从感性到容性（或从容性到感性）的运行，并且即使在暂态过程中，也能使九个直流平均电压得到控制并保持平衡。
This paper presents a three-phase transformerless cascade pulsewidth-modulation (PWM) static synchronous compensator (STATCOM) intended for installation on industrial and utility power distribution systems. It proposes a control algorithm that devotes itself not only to meeting the demand of reactive power but also to voltage balancing of multiple galvanically isolated and floating dc capacitors. The control algorithm based on a phase-shifted carrier modulation strategy is prominent in having no restriction on the cascade number. Experimental waveforms verify that a 200-V 10-kVA cascade PWM STATCOM with star configuration has the capability of inductive to capacitive (or capacitive to inductive) operation at the rated reactive power of 10 kVA within 20 ms while keeping the nine dc mean voltages controlled and balanced even during the transient state.