兰洲,但扬清,谷纪亭,娄云天
LAN Zhou,DAN Yangqing,GU Jiting,LOU Yuntian

• 1:国网浙江省电力有限公司经济技术研究院
• 2:浙江大学电气工程学院

摘要(Abstract)：

针对低电压穿越期间含全功率换流器系统可能失去潮流解的问题，分析了故障期间电网等值参数和潮流特性的变化规律，考虑换流器的控制特性，采用数值计算定性分析了不同系统变量对潮流解存在性的影响规律。基于电网等值参数变化规律和潮流雅克比矩阵行列式实时计算的方法，提出了仅需非故障电网等值参数和并网点实测电压的有功电流限幅自律控制方法。仿真结果表明，所提方法能够保证故障低电压穿越期间潮流解的存在，有利于电力系统的安全稳定运行。
Power flow solution of the system with a full-power converter may get lost during low-voltage ride-through(LVRT). Therefore, the change law of grid equivalent parameters and power flow characteristics during the fault is analyzed, and the law of influence of different system variables on the existence of power flow solution is analyzed qualitatively by numerical calculation considering the control characteristics of the converter. Based on the variation law of the grid equivalent parameters and the real-time calculation of the determinant of the Jacobi matrix of power flow, an active current amplitude limiting and autoregulation method is proposed that only requires the non-fault grid equivalent parameters and the measured voltage at the grid-connected point. The simulation results show that the proposed method can ensure the existence of the power flow solution during LVRT and is conducive to the safe and stable operation of the power system.

关键词(KeyWords)： 新能源发电并网;全功率换流器;低电压穿越;潮流解存在性;自律控制
grid-connected new energy power;full-power converter;LVRT;existence of power flow solution;autoregulation

Abstract:

Keywords:

基金项目(Foundation): 国网浙江省电力有限公司科技项目（5211JY20001U）

作者(Author): 兰洲,但扬清,谷纪亭,娄云天
LAN Zhou,DAN Yangqing,GU Jiting,LOU Yuntian

DOI: 10.19585/j.zjdl.202302003

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