当前晶闸管投切电容器组(TSC)无功补偿装置在实际工程应用中,采用外三角形连接方式进行频繁投切时,由于关断引起的电容残压,会导致三相晶闸管不同步导通的问题[1],严重影响了该无功装置的补偿效果,并造成电网系统三相不平衡,给其他设备的正常工作带来了潜在威胁.针对此种情况,本文进行了原理性推导,并提出一种基于空间矢量的新型晶闸管投切控制策略,选择性控制三相晶闸管的开通和关断顺序,来达到三相同步导通的目的.最后通过实验验证该控制策略是有效可行的.%Now days, in the practical engineering application, the thyristor switched (TSC) reactive compensation device is a major kind of reactive compensation device. TSC uses the outer triangle connection mode and switches the capacitor group frequently. Due to this operating mode, residual voltage will be caused by shutting off the capacitor group, then lead to the phenomenon of the three-phase asynchronous conduction [1]and the serious influence of the effect of the reactive power compensation device. In this situation, this article has conducted the original rational deduction, and puts forward a kind of new thyristor switching control strategy based on space vector. The strategy achieves the purpose of three-phase synchronous conduction through selectively control the order of three-phase thyristor's on or off Finally, the experimental results show that the control strategy is effective and feasible.
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