直流馈入的高比例新能源受端电网静态电压稳定分析  

Static Voltage Stability Analysis of Receiving-end Grid with DC Infeed High Penetration Renewable Energy

作　　者：赵伟 黄子洋 潘艳 徐鹏 李付强 李庚银 ZHAO Wei;HUANG Ziyang;PAN Yan;XU Peng;LI Fuqiang;LI Gengyin(North China Branch of State Grid Corporation of China,Beijing 100053,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)

机构地区：[1]国家电网有限公司华北分部,北京100053 [2]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《华北电力大学学报（自然科学版）》2022年第6期11-19,共9页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网公司华北分部科技项目(SGTYHT/19-JS-218)。

摘　　要：新能源高比例并网与网内交直流混联运行逐渐成为现代电力系统发展的关键特征和重要趋势,大容量非线性电力电子元件的不断投入使得系统表现出更复杂的稳定特性。为此,分析了直流馈入的高比例新能源受端电网静态电压稳定机理。首先对直流逆变站、新能源和负荷进行等效,建立直流馈入的高比例新能源受端电网简化模型,并通过节点消去对网络方程进行化简;然后基于判定静态电压稳定性的L指标推导新能源极限渗透率,作为受端电网静态电压稳定的临界判据,最后理论分析直流馈入、网络拓扑对新能源极限渗透率的影响。PSCAD仿真结果表明,直流馈入后新能源极限渗透率减小;同时,新能源极限渗透率与新能源、负荷之间电气距离呈负相关,与直流、负荷之间电气距离呈正相关。The high penetration of grid-connected renewable energy and the inner-grid AC-DC hybrid operation have gradually become key features and important trends in the development of modern power systems.The continuous investment of non-linear power electronic components with large-capacity has made the system show more complex stability characteristics.This paper focuses on the analysis of static voltage stability mechanism of receiving-end grid with DC infeed high penetration renewable energy.Firstly,the DC inverter station,renewable energy and load were made equivalent,and a simplified model of the receiving-end grid with DC infeed high penetration renewable energy was established.The network equation was simplified using node elimination method.Then,based on L index,which is used for determining static voltage stability,the penetration limit of renewable energy was derived as a critical criterion for the static voltage stability of the receiving-end.Finally,the influence of DC infeed and network topology on the limit penetration of renewable energy were theoretically analyzed.PSCAD simulation results show that the renewable energy limit penetration decreases after DC feeding in.Meanwhile,the renewable energy limit penetration is negatively correlated with the electrical distance between renewable energy and load,and positively correlated with the electrical distance between DC and load.

关 键 词：高比例新能源 静态电压稳定 L指标 直流馈入 新能源极限渗透率 

分 类 号：TM712[电气工程—电力系统及自动化]