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针对三角形连接的链式静止同步补偿器(static synchronous compensator,STATCOM)系统电压不平衡下的控制问题,提出分相瞬时电流控制策略,在此基础上研究了链式STATCOM在不平衡电压下的补偿模式,提出无功补偿和电压控制2种改进型补偿模式,并设计了其离散化电流环控制器。通过分相瞬时电流控制能够维持链式STATCOM在不平衡电压下的正常工作,2种改进型补偿模式使链式STATCOM能够有效的对不平衡系统进行补偿,仿真验证了所提控制策略及补偿模式。研制了一台三相36个链节的物理样机,并在样机上进行实验,证明了所提方法的正确性和有效性。
Aiming at the control problem of the triangular synchronous static synchronous compensator (STATCOM) system with unbalanced voltage, the control strategy of phase-split instantaneous current is proposed. Based on this, the compensation of unbalanced voltage of chain STATCOM Mode, two improved compensation modes of reactive power compensation and voltage control are proposed and their discrete current loop controllers are designed. Through the split-phase instantaneous current control, it can maintain the normal operation of the chain STATCOM under unbalanced voltage. Two improved compensation modes enable the chain STATCOM to compensate the unbalanced system effectively. The simulation verifies the proposed control strategy and compensation mode . A three-phase physical prototype of 36 links was developed and tested on a prototype to prove the correctness and effectiveness of the proposed method.