电压对称跌落下VSG自适应无功补偿控制策略
Electrical Automation（2021）
Abstract
虚拟同步机发电机(virtual synchronous generator,VSG)在电网电压对称跌落时逆变器输出电流幅值骤升,并且不能输出无功功率支撑电压.为此,根据无功电流需求推导出VSG在电压故障期间的电压参考指令,在限制电流幅值的同时,使逆变器按照电压跌落深度输出相应的无功功率,实现无功功率的自适应补偿.电压故障结束后VSG由该指令切换成正常工作模式,设计状态跟踪保证无扰切换.仿真结果证明了所提控制策略的有效性.
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