基于广义短路比的多馈入直流系统受端电网结构优化方法  

Optimization Method of Receiving-end AC Grid Structure for Multi-infeed DC System Based on Generalized Short-circuit Ratio

作　　者：汪家铭 张静 杨建华 王冠中[1] 章枫 辛焕海[1] WANG Jiaming;ZHANG Jing;YANG Jianhua;WANG Guanzhong;ZHANG Feng;XIN Huanhai(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China;Wenzhou Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd.,Wenzhou,325000,China;Electric Power Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310014,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]国网浙江省电力有限公司,浙江省杭州市310007 [3]国网浙江省电力有限公司温州供电公司,浙江省温州市325000 [4]国网浙江省电力有限公司电力科学研究院,浙江省杭州市310014

出　　处：《电力系统自动化》2020年第24期111-118,共8页Automation of Electric Power Systems

摘　　要：大规模直流多点馈入导致受端交流系统电压支撑能力相对变弱,电压稳定问题突出。因此亟须提升受端交流系统强度,但这在加强交流系统电气联系的同时也加剧了短路电流水平。受端交流系统的结构同时影响系统强度和短路电流水平,优化系统结构有助于协调系统强度与短路电流水平之间的矛盾。基于广义短路比的灵敏度分析和支路追加法,文中提出了一种电网结构优化方法。首先,分析了广义短路比和短路电流水平之间的变化关系;其次,研究了交流系统结构调整对上述2项指标的影响,分析了协调2项指标后的系统结构调整综合效益;最后,对不同直流落点进行分类,给出相应的受端交流系统结构优化调整策略。仿真算例验证了所提策略的可行性和有效性。Large-scale multi-infeed direct current(MIDC)systems lead to the relatively weak voltage support capability in receiving end AC systems,resulting in severe voltage stability issues.Although,it is critical to enhance the strength of the AC system,it may exacerbate the short-circuit current level.The structure of the receiving-end AC system affects both system strength and shortcircuit current level.Since optimizing the grid structure of the MIDC system can deal with the contradiction between system strength and short-circuit current level,this paper proposes a grid structure optimization method based on the sensitivity analysis of generalized short-circuit ratio(gSCR)and the branch addition method.Firstly,the relationship between the gSCR and the shortcircuit current level is explored.Secondly,the impact of AC system structure adjustment on the two indicators is studied,and the comprehensive benefits of structure adjustment after coordination of the two indicators are analyzed.Finally,the receiving-end DC terminals are classified,and corresponding optimization methods for receiving AC system structures are given.Simulation results verify the validity and effectiveness of the proposed method.

关 键 词：多馈入直流系统 广义短路比 短路电流 灵敏度分析 支路追加法 电网结构优化 

分 类 号：TM721.1[电气工程—电力系统及自动化]