支路约束优化下的电网结构脆弱性研究  

Research on Grid Structural Vulnerability Based on Optimal Branch Limit

作　　者：刘群英[1] 刘俊勇[2] 刘起方 史继莉 

机构地区：[1]电子科技大学自动化工程学院,成都610054 [2]四川大学电气信息学院,成都610065 [3]中国国电四川阿水电力开发有限公司,成都610015 [4]广州抽水蓄能水电厂,从化510950

出　　处：《电工技术学报》2011年第3期148-154,161,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51007006);电子科技大学青年教师基金;教育部博士点新教师基金(20090185120023)资助项目

摘　　要：根据发电机出力变化与系统能量裕度变化的关系及其与支路潮流变化之间的关系,在求取发电机出力变化对支路电流变化的影响因子基础上,采用非线性优化的思路,通过预测-校正内点法对系统所有发电机出力变化量进行组合优化,计算了对应不同系统状态的支路电流变化量约束上下限,并根据约束上下限构建了支路脆弱性评估指标。最后在IEEE-30母线系统中比较了本文所提方法与传统最优潮流法两种优化手段下的脆弱性评估,结果证明,根据系统运行条件变化来实时更新支路电流变化量约束上下限是本研究的一大优点;另外,由于多台发电机出力变化的综合效应可能引起支路的脆弱性并不按照通常趋势变化,鉴于此,这里在使用能量裕度获取支路约束时,允许支路潮流变化由不特定的发电机引起,有助于进一步探索电网的支路脆弱性。According to the relationships among the change of generator production,energy margin and change of branch power flow,with the impact factor of the change of generator production on current as the basis,the combination of production change of all generators and the upper and lower limits of branch restriction are first computed by the non-linear programming.And then,based on the branch restriction,the assessment indexes of branch vulnerability are founded.At last,the validity and feasibility of this method is identified by the comparison of simulation results with optimal power flow in IEEE-30 bus system.One of the advantages of this research is that the upper and lower limits of branch restriction can be updated timely.In addition,because of the synthetical efficiency of multi-generators,the branch vulnerable characteristics may not change with the common trend.Therefore,when the energy margin is used to compute the branch limit,the branch power flow is admitted to change with the unspecific generator.As a result,it is helpful to further research the branch vulnerability.

关 键 词：电网结构脆弱性 预测-校正内点法 支路约束优化 电流影响因子 能量裕度 

分 类 号：TM732[电气工程—电力系统及自动化] TM711