南方电网技术2025，Vol.19Issue(5)：93-101,163,10.DOI:10.13648/j.cnki.issn1674-0629.2025.05.009
计及锁相环暂态过程的正负双序控制光伏短路电流计算方法
Calculation Method of Positive and Negative Sequence Controlled Photovoltaic Short-Circuit Current Considering Phase-Locked Loop Transient Process
摘要
Abstract
With the continuous increase of photovoltaic power generation installed capacity,accurate analysis and calculation of photovoltaic fault output characteristics have become the key to the safe operation of power systems.The control of inverters directly affects the fault behavior of photovoltaic power generation systems.When an asymmetric short-circuit fault occurs in the power grid,the existing photovoltaic short-circuit current calculation methods do not consider the transient process of the phase-locked loop and ignore the impact of phase-locked deviation on the short-circuit current,which may result in significant errors.To this end,the transient response of photovoltaic positive and negative sequence control under power grid faults is analyzed,the expression of posi-tive and negative sequence AC and DC axis currents is derived,the tracking characteristics of currents are analyzed,and a calculation method for phase locking deviation under asymmetric power grid faults is further proposed.The influence of phase locking deviation on photovoltaic short-circuit current in the positive and negative sequence control process is analyzed,and the expression of photovoltaic positive and negative sequence current in the positive and negative sequence rotating coordinate system is derived.The calculation method of photovoltaic short-circuit current is obtained,and the correctness of the proposed photovoltaic short-circuit cur-rent calculation method is verified through simulation analysis.关键词
光伏发电/短路电流/锁相环/故障分析Key words
photovoltaic power generation/short-circuit current/phase-locked loop/fault analysis分类
动力与电气工程引用本文复制引用
李世伟,毕书奇,许守东,欧阳金鑫,龚辉,石恒初,张丽..计及锁相环暂态过程的正负双序控制光伏短路电流计算方法[J].南方电网技术,2025,19(5):93-101,163,10.基金项目
国家自然科学基金面上项目(51877018),云南电网有限责任公司科技项目计划(YNKJXM202 20177).Supported by the General Program of National Natural Science Foundation of China(51877018) （51877018）
the Science and Technology Project of Yunnan Power Grid Co.,Ltd.(YNKJX M20220177). （YNKJX M20220177）
