考虑惯量充裕度与频率变化率的互联电网在线频率安全分析  

On-line Frequency Security Analysis of Interconnected Power Grid Considering Inertia Adequacy and RoCoF

作　　者：刘翔宇[1,2] 李慧斌 顾雪平 仲悟之[3] 李增辉 史善哲 LIU Xiangyu;LI Huibin;GU Xueping;ZHONG Wuzhi;LI Zenghui;SHI Shanzhe(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;State Grid Hebei Electric Power Co.Ltd,Shijiazhuang 050021,Hebei Province,China;State Key Laboratory of Power Grid Security and Energy Conservation(China Electric Power Research Institute),Haidian District,Beijing 100192,China;National Power Dispatching&Control Centre,Xicheng District,Beijing 100031,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北省保定市071003 [2]国网河北省电力有限公司,河北省石家庄市050021 [3]电网安全与节能国家重点实验室(中国电力科学研究院有限公司),北京市海淀区100192 [4]国家电力调度控制中心,北京市西城区100031

出　　处：《电网技术》2023年第5期1780-1787,共8页Power System Technology

基　　金：国家电网有限公司科技项目(5100-202113024A-0-0-00)。

摘　　要：新能源装机占比的快速提高显著降低了系统惯量水平,在线评估电网的频率安全裕度可有效指导系统安全运行。首先在分析系统惯量组成的基础上,提出了考虑负荷特性与外受电水平的电网惯量计算方法,得到了电网惯量充裕度指标与频率变化率(rate of change of frequency,RoCoF)指标。然后基于惯量充裕度指标与RoCoF,分析了故障冲击、外受电水平和马达惯量对系统频率安全的影响,提出了区域电网互供能力分析方法。其次通过仿真验证了指标的准确性,检验了等效惯量和电源出力均具有置换特点。最后提出了电网惯量充裕度在线评估流程及安全运行域分析方法,为指导电网安全运行提供了决策依据。Since the significant decrease of the system inertia level caused by the rapid increasing proportion of new energy installed capacity,the online assessment of the frequency security margin of the power grid effectively provides a guidance for the safe operation of the system.Firstly,a calculation method of the grid inertia considering the load characteristics and the external power receiving level is proposed by analyzing the composition of the system inertia,and the grid inertia adequacy index and the rate of change of frequency(RoCoF)index are obtained.Secondly,based on the inertia adequacy index and the RoCoF,an analysis of regional power grid mutual supply capacity studying the influence of the fault impact,the power receiving level and the motor inertia on the system frequency security is proposed.Thirdly,the accuracy of the index is verified,the displacement characteristics of the equivalent inertia and the generated output are tested by simulation.Finally,the online evaluation process of the grid inertia adequacy and the analysis method of the safe operation region are proposed,which provides the decision-making basis for guiding the safe operation of the power grid.

关 键 词：惯量充裕度 RoCoF 互联电网 频率安全 负荷惯量 

分 类 号：TM761[电气工程—电力系统及自动化]