基于改进电压灵敏度分析的大区电网间容量交换能力评估  

Evaluation on Capacity Exchange Ability Between Large Regional Power Grids Based on Analysis of Improved Voltage Sensitivity

作　　者：董飞飞[1] 刘涤尘[1] 吴军[1] 黄涌[2] 宋春丽[1] 赵一婕[1] 潘旭东[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]湖北省电力公司电力经济技术研究院,湖北省武汉市430077

出　　处：《电网技术》2013年第7期1862-1867,共6页Power System Technology

基　　金：国家高技术研究发展计划(863计划)(2011AA05A119);国家电网公司大电网重大专项资助项目课题(SGCC-MPLG029-2012);中央高校基本科研业务费专项基金(2012207020207)~~

摘　　要：提出基于断面交换容量–电压变化比的灵敏度分析方法,对大区电网间潮流断面上的交换容量–电压稳定性进行分析,得出系统薄弱通道和敏感节点。对基于交换容量最敏感节点的电压灵敏度变化趋势进行样条插值,对样条插值所得的离散值进行非齐次指数函数拟合后求导,得出电压灵敏度的变化率函数,根据电压稳定临界点的判别条件计算交换容量极限,并以电压稳定裕度指标进行校验。对"三华"特高压电网的容量交换能力评估的应用表明,所提方法正确、有效,且具有较高的精度。A method to analyze the sensitivity of tie line exchange capacity to voltage variation ratio is proposed and used to analyze the relation of exchange capacity of tie line between large regional power grids to voltage stability.Applying spline interpolation to the variation tendency of voltage sensitivity at the node that is most sensitive to the exchanged capacity,the discrete values obtained from the spline interpolation are fitted by inhomogeneous exponential function and differentiated to obtain the function of change rate of voltage sensitivity,and then according to the criterion for critical point of voltage stability the limit of exchanged capacity is computed and validated by of voltage stability margin index.Applying the proposed method in the evaluation of the capacity exchange ability of the San-Hua UHVAC power grid that interconnects North China power grid and Central China power grid with East China power grid,the evaluation results show that the proposed method is correct and effective,and the evaluation results are of high accuracy.

关 键 词：电力系统 静态电压稳定 改进电压灵敏度 电压稳定裕度 容量交换能力 

分 类 号：TM721[电气工程—电力系统及自动化]