摘要
随着直流建设规模扩大,能源中心将逐渐形成多直流外送的送端电网。针对多直流送端闭锁过电压问题,该文结合奇异摄动理论阐释直流闭锁动态过电压的双时标机理,指出同步机对电压上升的关键作用。据此,该文提出分析闭锁期间过电压的交直流慢系统模型,同时给出直流在过电压上升阶段的等效静态负荷模型。闭锁期间主导电压动态上升的系统被证明是单调系统,结合单调系统理论,揭示过电压关于发电机相关动态参数的保序性质。最后提出动态上升过电压的快速解析解耦计算方法。通过宁夏多直流送端电网算例验证分析结果与计算方法的准确性。
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.
作者
廖圣文
甘德强
摆世彬
田志浩
刘刚
李桐
LIAO Shengwen;GAN Deqiang;BAI Shibin;TIAN Zhihao;LIU Gang;LI Tong(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China;State Grid Ningxia Electric Power Co.,Ltd.,Yinchuan 750001,Ningxia Hui Autonomous Region,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第11期4181-4192,I0002,共13页
Proceedings of the CSEE
基金
国网宁夏电力有限公司科技项目(5229NX19008Q)。
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
multi-send HVDC system
DC blocking
overvoltage
singular perturbation
monotonic system theory
