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针对动态电压恢复器(DVR)的电压补偿策略,首先简述了跌落前电压补偿法、同相电压补偿法、最小能量补偿法等几种方法,然后用相量图的形式详细地分析了上述几种补偿方法的原理,并在此基础上提出了1种确定动态电压恢复器最佳补偿点的方法。采用该控制方法的DVR节约了DVR直流侧存储的能量,延长了电压补偿的时间,同时避免了系统侧电压上升时引起能量倒灌导致直流侧过电压的威胁。最后用仿真试验的方式验证了该方法的有效性。
Aiming at the voltage compensation strategy of dynamic voltage restorer (DVR), the methods of pre-drop voltage compensation, in-phase voltage compensation and minimum energy compensation are briefly introduced. Then, This paper proposes a method of determining the best compensation point of dynamic voltage restorer. The DVR with this control method saves the energy stored in the DC side of the DVR, prolongs the voltage compensation time, and avoids the threat of DC overvoltage caused by energy backflow when the system voltage rises. Finally, the effectiveness of this method is verified by the simulation experiment.