基于交流斩波装置的三相不平衡无功补偿方案

Reactive compensation scheme of three phase unbalance based on AC chopper device

提出采用交流斩波装置对三相不平衡系统进行动态无功补偿的方案,给出了装置结构,通过仿真验证了交流斩波装置可通过改变占空比来调节输出电压,进而调节容性负载的容量值,实现不平衡负载无功功率的动态调节;采用Matlab软件对交流斩波装置在三相四线制不平衡系统无功补偿中的应用进行了仿真研究,结果表明,交流斩波装置可连续可调地补偿不平衡电流,且不会向电网注入谐波电流。

The paper proposed a scheme of using AC chopper device to compensate three phaseunbalanced system dynamically and gave the device structure. The simulation result verified that the AC chopper device can adjust output voltage by changing duty ratio, and then adjust capacity value of capacitive load, which achieves dynamic reactive power regulation of unbalanced load. It also simulated application of the AC chopper device in reactive power compensation of three-phase four-wire unbalanced system by use of Matlab software, and the result showed that the AC chopper device can continuously and adjustably compensate unbalance current and pours no harmonic current into power grid.