中国电机工程学报2024，Vol.44Issue(11)：4181-4192,中插2,13.DOI:10.13334/j.0258-8013.pcsee.223211
多直流送端电网闭锁动态过电压分析与计算方法
Analysis and Calculation Methods of Dynamic DC Blocking Overvoltage in Multi-send HVDC Systems
摘要
Abstract
As the scale of DC lines continues to expand,energy centers are gradually developing sending end systems capable of delivering significant amounts of power through multiple DC lines.Aiming at the problem of DC blocking overvoltage in multi-send HVDC systems,this paper sheds light on the mechanism of dynamic rising overvoltage phenomenon from a two-time scale perspective and demonstrates the leading role of synchronous generators at the voltage rising stage using singular perturbation theory.Accordingly,this paper proposes a slow system model for analyzing the overvoltage during the blocking period and gives an equivalent static load model of DC during the overvoltage rising stage.It is proved that during DC blocking period,the system predominantly inducing the rising voltage is a monotonic system and the order-preserving properties between overvoltage and generator dynamic parameters are revealed with monotonic system theory.Finally,a fast analytical decoupling calculation method for dynamic rising overvoltage is proposed.The accuracy of the analysis result and calculation method can be validated by the multi-sending end power grid in Ningxia.关键词
多直流送端系统/直流闭锁/过电压/奇异摄动/单调系统理论Key words
multi-send HVDC system/DC blocking/overvoltage/singular perturbation/monotonic system theory分类
信息技术与安全科学引用本文复制引用
廖圣文,甘德强,摆世彬,田志浩,刘刚,李桐..多直流送端电网闭锁动态过电压分析与计算方法[J].中国电机工程学报,2024,44(11):4181-4192,中插2,13.基金项目
国网宁夏电力有限公司科技项目(5229NX19008Q). Project Supported by Science and Technology Project of Ningxia Electric Power Company(5229NX19008Q). （5229NX19008Q）
