基于链式SVG三相不平衡负荷的平衡补偿方法的仿真分析

本文对链式静止无功发生器的工作原理进行了分析,在深入研究三相不平衡负荷的平衡化补偿原理的基础上,提出了一种基于链式静止无功发生器在不平衡补偿时的分相补偿控制方法.该方法是通过对静止无功发生器各相输出电压与电网电压的相角差δ进行调节来控制各相输出电流,从而可以有效地对三相负载不平衡的系统进行平衡补偿.对所提出的补偿方法进行了仿真研究,仿真结果表明运用分相控制方法补偿三相不平衡负载,具有比较好的稳态补偿效果,补偿后电网电流三相平衡,各相电流与电压基本同相位并且幅值成相同的比例,达到了负载功率平衡和无功补偿的目的.

Balancing Compensation of Three-Phase Unbalanced Load Based on Chain Static Var Generator

This paper analyzes the working principle of chain static vat generator. On the basis of in-depth study of the principle of balancing compensation of three phase unbalanced load, a phase split compensation control meth＇od is put forward, which is based on chain static var generator under unbalanced compensation. This method is through the phase difference angle δ between the output voltage of each phase and grid voltage to control the output current of each phase, thus it can balanced compensate the three phase unbalanced load system effectively. The proposed compensation method for the simulation research, its results show that the split phase unbalanced compensation control strategy has good steady state compensation effect. The three phase grid current is balanced after compensation, the current and voltage of each phase are in phase basically, and the amplitudes are in same proportion, reaches the purposes of load power balancing and reactive compensation.