多直流馈入系统最近鞍结分岔点迭代算法  

Computation Method of the Closest Saddle-node Bifurcation Point in LCC-HVDC Multi-infeed Systems

作　　者：王冠中 王巍[1] 张宇[1] 史千弘 郭一忱 丁磊[1] 张良一 王尔玺 WANG Guanzhong;WANG Wei;ZHANG Yu;SHI Qianhong;GUO Yichen;DING Lei;ZHANG Liangyi;WANG Erxi(Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University),Ministry of Education,Jinan 250061,Shandong Province,China;State Grid Hubei Electric Power Research Institute,Wuhan430070,Hubei Province,China)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061 [2]国网湖北省电力有限公司电力科学研究院,湖北省武汉市430070

出　　处：《电网技术》2025年第3期1130-1136,共7页Power System Technology

基　　金：国家电网有限公司科技项目(5100-202255327A-2-0-YS)。

摘　　要：随着越来越多的新能源发电经由直流输电进行跨区域传输,多直流馈入受端系统面临严峻的电压稳定风险。依托广义短路比表征的电网强度及其与多馈入系统电压稳定裕度之间的关系,该文提出一种多直流注入功率空间最近鞍结分岔点的迭代搜索算法,可用于快速计算当前运行点到稳定边界的欧式距离。首先,根据直流多馈入系统的临界广义短路比,利用拓展导纳矩阵的奇异性,构造表征系统鞍结分岔的功率空间代数方程组;其次,证明了利用广义短路比对应的右特征向量可构造出功率参数空间中稳定边界的法向量,依托广义短路比确立的功率空间是凸的;最后,利用上述结果,提出了多直流功率注入空间最近鞍结分岔点的迭代搜索算法。算例计算结果说明所提方法满足工程要求,为多馈入系统的稳定风险识别提供了便捷工具。As more and more new energy power generation is transmitted across regions through DC transmission,the multi-DC feed-to-receive system faces severe voltage stability risks.Relying on the grid strength represented by the generalized short-circuit ratio and its relationship with the voltage stability margin of the multi-infeed system,this paper proposes an iterative search algorithm for the nearest saddle-node bifurcation point in the multi-DC injection power space,which can be used to quickly calculate Euclidean distance from the current operation to the stable boundary.Firstly,according to the critical generalized short-circuit ratio of the DC multi-infeed system,the power space algebraic equations representing the saddle-node bifurcation of the system are constructed by using the singularity of the extended admittance matrix.Secondly,the right eigenvector corresponding to the generalized short-circuit ratio is proved to construct the normal vector of the stable boundary in the power parameter space,and the power space established by the generalized short-circuit ratio is convex.Finally,using the above results,an iterative search algorithm for the nearest saddle-node bifurcation point in the multi-DC power injection space is proposed.The calculation results of the example show that the proposed method meets the engineering requirements and provides a convenient tool for the stability risk identification of the multi-feed system.

关 键 词：直流多馈入系统 广义短路比 鞍结分岔点 迭代算法 

分 类 号：TM721[电气工程—电力系统及自动化]