中文摘要：

针对长时间电压跌落下矿用动态电压恢复器直流链路电容储能利用率较低的问题,提出了一种从完全补偿法到同相补偿法的优化组合补偿策略,即2种补偿策略之间平滑缓慢过渡,从而抑制跌落时刻的负载电压畸变,降低动态电压恢复器注入电压幅值,延长动态电压恢复器的补偿时间。实验结果表明,该策略在平衡和不平衡电压跌落条件下均能正确可靠地补偿电网电压跌落。

英文摘要：

To solve low utilization of DC-link capacitor of mine-used dynamic voltage restorer under long voltage sag,an optimized compensation strategy was proposed,namely a smooth transition between pre-sag compensation and in-phase compensation,so as to restrain aberration of load voltage during the sag,reduce amplitude of injected voltage of dynamic voltage restorer and increase compensation time.The experimental results verify feasibility and reliability of the strategy in balanced and unbalanced grid voltage sag.