计及新能源出力波动性的节点状态脆弱性评估  

State vulnerability assessment considering the output fluctuation of new energy power supply nodes

作　　者：程军照 林涛[2] 杜蕙 Cheng Junzhao;Lin Tao;Du Hui(Power Grid Planning and Construction Research Center,Yunnan Power Grid Co.,Ltd.,Kunming 650000,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]云南电网有限责任公司电网规划建设研究中心,昆明650000 [2]武汉大学电气与自动化学院,武汉430072

出　　处：《电测与仪表》2021年第12期118-124,共7页Electrical Measurement & Instrumentation

摘　　要：电网的状态脆弱性能够从运行状态角度反映电网所具有的抵御电压或频率扰动的能力。随着高渗透率可再生能源的接入,电力系统的运行方式和安全控制手段变得越来越复杂。有必要对现有的节点状态脆弱性评估方法进行改进,进一步考虑新能源机组特点及其出力波动性进行状态脆弱性评估。文章基于新能源电源并网点对外电网戴维南等值模型,提出一种新能源电源节点脱网免疫指标和计算方法,并在此基础上计及新能源电源出力的波动性,提出一种基于点估计法的新能源电源节点状态脆弱性指标。基于某省级电网实际算例对所述方法的正确性及有效性进行了验证分析。方法能够对计及出力波动条件下的新能源机组脱网风险进行综合评估,可应用于对新能源电站不同接入方案的评估与规划。The state vulnerability of power grid can reflect the ability of power grid to withstand voltage or frequency disturbance from the perspective of operation state.With the access of high permeability renewable energy,the operation mode and security control means of power system become more and more complex.It is necessary to improve the existing node state vulnerability assessment methods and evaluate the state vulnerability by considering the characteristics of new energy units and their output volatility.Based on the Thevinin equivalent model of new energy grid-connected points,this paper proposes a new energy power node off-grid immunity index and calculation method,and on this basis,considering the volatility of new energy power supply output,proposes a state vulnerability index of new energy power supply node based on point estimation method.The correctness and effectiveness of the proposed method are verified and analyzed based on an example of a provincial power grid.The results show that this method can be applied to the vulnerability assessment of node state under different access schemes of new energy power stations and the comprehensive assessment of the off-grid risk of new energy power supply nodes under the condition of output fluctuation of new energy.

关 键 词：脆弱性评估 新能源 波动性 戴维南等值 点估计法 

分 类 号：TM71[电气工程—电力系统及自动化]