配电网三相不平衡补偿装置的研究

为了解决中、低压配电网系统中普遍存在的三相负荷不平衡问题，利用晶闸管控制电抗器和固定电容器组相结合的补偿方式来进行负荷不平衡和无功功率的综合补偿。根据三相不平衡补偿原理，可以由负载的三相线电流获得需要补偿的电纳值；利用分相调节模式，可以提供三相分别控制的、连续平滑变化的等效电纳值，通过调节静止晶闸管的触发角，获得电纳的给定值，达到补偿效果。仿真结果表明，该装置可以对三相不平衡负荷同时实现无功功率补偿和负荷平衡化。

Research on Triphase Unbalanced Load Compensator in Distribution System

Aiming at the problem of triphase load unbalance common in MV and LV distribution system,this paper presents a method to compensate the unbalanced loads and reactive power in the distribution system.The method uses a thyristor-controlled reactor and fixed capacitor as the compensator.According to the general principle to compensate the unbalanced loads,the susceptance demanded is calculated.Then,with individual phase control,the compensator can provide different equivalent susceptance in different phase.By regulating the firing angle of the thyristor,the given susceptance can be achieved.The results of the simulations testify the efficiency of the instrument to compensate the reactive power and balance the distribution system.