直流多馈入系统有效广义短路比  

Effective Generalized Short Circuit Ratio for Multi-infeed DC Systems

作　　者：徐谦 戴攀 章枫 辛焕海[2] XU Qian;DAI Pan;ZHANG Feng;XIN Huanhai(State Grid Zhejiang Economy Research Institute,Hangzhou 310008,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]国网浙江省电力有限公司经济技术研究院,杭州310008 [2]浙江大学电气工程学院,杭州310027

出　　处：《浙江电力》2019年第6期53-58,共6页Zhejiang Electric Power

基　　金：国家重点研发计划项目(2016YFB0900104);国网浙江省电力有限公司科技项目(5211JY160011)

摘　　要：在一定假设条件下,广义短路比指标能够较好地描述直流多馈入系统受端交流电网的强度,在此基础上分析了无功补偿电容对于广义短路比的影响,为了消除此影响,提出了一种考虑无功补偿的有效广义短路比指标,克服了广义短路比推导过程中需假设直流消耗无功近似完全补偿,无功补偿容量与直流额定容量成比例的缺陷。理论分析和仿真算例均表明,新定义下的有效广义短路比指标更具普适性,能更准确地描述考虑无功补偿电容的直流多馈入系统受端交流电网的强度。Under several assumptions,generalized short circuit ratio(gSCR)can assess the strength of receiving-end AC grid of multi-infeed DC system.The paper analyzes the impact of reactive power compensation capacitor on generalized short circuit ratio.In order to erase the impact,the paper proposes an effective generalized short circuit ratio(EgSCR)based on reactive power compensation,which can overcome the drawback that the reactive power absorbed by HVDCs need to be assumed compensated locally by the compensation capacitors and that reactive compensation capacity is proportional to rated DC capacity.Theoretical analysis and simulations illustrate that the proposed EgSCR is widely applicable and assess the strength of receiving-end AC grid of multi-infeed DC system in consideration of reactive power compensation.

关 键 词：直流多馈入系统 静态电压稳定 有效广义短路比 无功补偿电容 

分 类 号：TM714.3[电气工程—电力系统及自动化]