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中文摘要：
传统的锁相环（PLL）算法不能满足动态电压恢复器（DVR）在三相电压不平衡故障时的快速准确锁相要求。在分析传统PLL的基础上,提出了dαβ-PLL和＂推演顺接＂相结合的锁相策略。新的锁相策略在电压跌落开始的第一个周波T（20 ms）内基于历史数据进行推演并锁定相位;一个周波之后采用dαβ-PLL来锁定相位。仿真结果与样机试验验证了新型PLL锁相策略在三相电压不平衡跌落故障时能够快速准确锁相,可以满足DVR的使用要求。
英文摘要：
Traditional PLL algorithms cannot satisfy the requirement of dynamic voltage restorer（ DVR） for speed and accuracy during three-phase voltage imbalance sag. Based on analysis of traditional PLL aglorithms,this paper proposed a novel PLL strategy which combines the dαβ-PLL algorithm with a phase prediction method using historial data. During the first cycle of the fault,the phase angle is estimated from the recorded voltage just before the fault occurred; and after the first cycle,the estimated values of dαβ-PLL are then used for phase angle eatimation. The simulation results and prototype test verfied that the proposed PLL strategy is capable to achieve fast phase-locking during three-phase voltage imbalance sag.
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