运行方式改变后弱阻尼特征模式的快速计算方法  

Fast Weak Damping Eigenmode Calculation of Varying Operating Conditions

作　　者：刘昀 许瑨 李兆伟 LIU Yun;XU Jin;LI Zhaowei(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211167,Jiangsu Province,China;State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,Jiangsu Province,China;NARI Group Corporation/State Grid Electric Power Research Institute,Nanjing 211000,Jiangsu Province,China)

机构地区：[1]南京工程学院电力工程学院,江苏省南京市211167 [2]国网江苏省电力有限公司,江苏省南京市210000 [3]南瑞集团有限公司/国网电力科学研究院有限公司,江苏省南京市211000

出　　处：《现代电力》2024年第2期249-257,共9页Modern Electric Power

基　　金：南京工程学院校级科研基金(YKJ202108)。

摘　　要：随着新能源与柔性负荷的大规模接入,电力系统运行方式实时变化,弱阻尼特征模式的阻尼特性亦随之改变。为有效评估实际系统的动态稳定性,传统QR法精度高,但速度难以满足弱阻尼特征模式的在线追踪需求。为此,针对运行方式改变后弱阻尼模式的模态特性,基于发电机惯量等值提出一种状态量的分群聚合方法,利用机电振荡模式的状态空间降维映射,实现弱阻尼特征模式的快速搜索。为保证所得特征模式的可靠性,提出了主导群相关因子指标,对状态量分群变化场景自适应选择精确的QR法,并由此构建弱阻尼特征模式计算框架,以解决实际系统特征值计算中存在的模式匹配与模态时变问题。与QR算法的对比验证了所提方法的快速性与准确性。With the increasing penetration of renewable energy resources and flexible loads,the damping characteristics of critical electromechanical eigenmodes change with the time invariant operating conditions of power systems.When it comes to the dynamic stability evaluation,the QR method is accurate,but fails to satisfy the needs for online tracing.In order to calculate the time-varying eigenmodes,this paper proposes a method to reduce the state matrix order of the system via inertia equivalence.All state variables of an eigenmode are mapped to a new sub-space upon the modal clusters.However,the pattern matching and modal varying of eigenvalues in the calculation may lead to discontinuous results.To solve the problems,the relevant factor index of the dominant clusters is proposed and a framework is built to achieve fast calculation of critical eigenvalues in different conditions.The critical eigenmode calculation method is tested in the IEEE 145-bus system,and the simulation results demonstrate its accuracy and rapidity.

关 键 词：机电振荡 特征值计算 模态分析 惯量等值 

分 类 号：TM712[电气工程—电力系统及自动化]