中文摘要：

动态电压恢复器（DVR）工作时流经全部负载电流,其输出能量的大小则会影响储能单元充放电时间的长短。详细分析了同相位补偿、故障前补偿和最小能量补偿3种方式下DVR能量流动的规律。同相位补偿时,输出的电压最小,但在大多数时候可能输出的能量较大;故障前电压补偿方式下只要是电压发生暂降,必然需要向系统提供有功和无功才能满足控制的需求,这就对储能单元的功率输出提出了较高的要求;最小能量补偿方式下,指定补偿角的选取是关键。能量流动中有功功率的确定是配置储能单元额定储能量的前提,同时也是控制单元实现和执行补偿策略的理论依据。Matlab的仿真结果证明了以上结论。

英文摘要：

When DVR（Dynamic Voltage Restorer） works,the load current passes through it completely,and its energy output will influence the charge and discharge time of energy storage unit.The energy-flow law of DVR is analyzed under three compensation modes：in-phase compensation,pre-fault compensation and minimal energy compensation.Under the in-phase compensation mode,the output voltage of DVR is the smallest,but the energy output may be relatively larger in most cases.Under the pre-fault voltage compen-sation mode,it is necessary to provide active and reactive power for system in order to meet the control re-quirements as long as the voltage sag occurs,which requests the power output of energy storage unit.Under the minimal energy compensation mode,selection of the specific compensation angle is the key.Determina-tion of active power energy flow is the premise of configuring the rated storage unit,as well as the theo-retical basis of implementing the compensation strategies by control unit.Results of Matlab simulation prove above conclusions.