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受三相不平衡及谐波电压的影响,常规SRF-PLL的带宽较窄,在发生电压跌落、相位跳变时调节时间过长,从而影响微网的正常运行.为克服这一缺点,建立SRF-PLL的s域小信号模型,分析电压对SRF-PLL动态性能的影响,提出一种改进SRF-PLL的电压同步技术,并进行理论分析、仿真和实验验证.研究结果表明,所提出的改进型SRF-PLL同步技术可缩短电压跌落和相位跳变的响应时间,实现对微网电压相位的快速准确跟踪.“,”The bandwidth of SRF-PLL is limited by the disturbance of imbalance and harmonics of the grid voltage.So the settling time of SRF-PLL will be prolonged when there exists voltage sag and/or phase jump,which will influence the normal operation of the Microgrid.In order to overcome the disadvantage,this paper models the SRF-PLL in the s domain,analyzes the influence of the voltage to the dynamic performance of the SRF-PLL,and proposes a novel synchronization strategy based on improved SRF-PLL.The proposed strategy is verified by theory analysis,simulation and experiment results.