特高压直流分层接入的稳定性模态分析方法  

Modal Analysis on System Stability of UHVDC Hierarchical Connection to AC Grid

作　　者：王晓辉[1] 陈庆军[1] 张彦涛 韩奕 周勤勇 刘建坤 张宁宇 WANG Xiaohui;CHEN Qingjunl;ZHANG Yantao;HAN Yi;ZHOU Qinyong;LIU Jiankun;ZHANG Ningyu(Key Laboratory of Power System Intelligent Dispatch and Control（Shandong University）,Ministry of Education,3inan 250061,Shandong Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,Jiangsu 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]中国电力科学研究院有限公司,北京市海淀区100192 [3]国网江苏省电力有限公司电力科学研究院,江苏省南京市211103

出　　处：《电网技术》2018年第9期2869-2875,共7页Power System Technology

基　　金：国家电网公司科技项目:多直流馈入系统安全性量化评估技术研究~~

摘　　要：作为一种新型模式,特高压直流分层接入交流电网不仅可有效解决潮流疏散问题,而且减少了对受端电网支撑能力的要求。从电气特性来看,特高压直流分层接入模式呈现更为紧密的耦合特性。将经典直流控制方式的动态特性考虑在内,建立了描述特高压直流分层接入方式多种耦合关系的微分代数方程（differential algebra equation,DAE）模型。基于此模型的线性化表示,计算关键特征值,探讨了模态分析方法在特高压直流分层接入的稳定量化评估中的可行性。仿真案例将该方法与传统混联系统评估指标进行对比,初步验证了模态分析方法的有效性。通过典型案例的模态分析结果,证实了特高压直流分层接入模式的稳定性优势。As an innovative mode, UHVDC hierarchical connection features more efficient power flow and less requirement of support from receiving grid. From the perspective of electrical properties, it shows more intensive coupling. Considering the dynamic characteristics of classical control mode, the differential algebra equation（DAE） model enabling description of various coupling in UHVDC hierarchical connection is established in this paper. Then the approach, based on DAE linearized expression and critical eigenvalues derived from modal analysis, is investigated on feasibility to quantitatively estimate stability of HVDC system. The proposed approach is validated by comparing with traditional indices widely used in hybrid AC/DC system. Meanwhile simulation results of typical scenarios, more or less, demonstrate advantage of UHVDC hierarchical connection in stability.

关 键 词：特高压直流 分层接入 直流控制 微分代数方程模型 模态分析 

分 类 号：TM721[电气工程—电力系统及自动化]