弱连接VSC的锁相环同步暂态稳定综述

Overview of transient stability analysis of phase locked loop synchronization in weak-grid connected VSC

聚焦于单个弱连接电压源变流器(WG-VSC)系统在对称故障等大扰动下的锁相环同步暂态稳定性问题,梳理总结了其研究现状,包括暂态失稳现象、稳定机理、量化分析方法、稳定性提升控制措施等.实际运行控制中,从参数空间的角度分析以VSC注入有功/无功电流为参数空间的暂态稳定域更为直观,因此定义该暂态稳定域为电流可行域,并综述了相关研究工作.最后从多WG-VSC并联系统、不对称故障下、电压源虚拟同步型或构网控制下、不同锁相环的影响分析等方面展望了锁相环同步暂态稳定性问题的发展与应用前景.

It is focused on the phase locked loop synchronization transient stability problem of a single weak-grid connected voltage source converter(WG-VSC)system under the large disturbance such as symmetric fault,and its current research work is reviewed,including the transient instability phenomenon,stability mecha-nism,quantitative analysis method and stability enhancement control methods.In the actual operation control,it is more intuitive to analyze the transient stability region with VSC active/reactive current injection as the parameter space,which is defined as the feasible region of current,and the related research work is also summarized.Finally,the development and application prospects of phase locked loop synchronization transient stability problem are prospected from the aspects of multi-WG-VSC paralleled system,asymmetric faults,vol-tage source generator virtual synchronized control or grid-forming control,and influence analysis of different phase locked loops.