基于s域节点导纳矩阵的谐振稳定性分析方法  

Resonance stability analysis method based on s-domain node admittance matrix

作　　者：徐政[1] XU Zheng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力自动化设备》2023年第10期1-8,共8页Electric Power Automation Equipment

摘　　要：谐振稳定性问题在新型电力系统背景下日益突出,目前缺乏在大系统层面进行谐振稳定性分析的有效方法。在阐述谐振稳定性的定义和机理的基础上,提出了基于s域节点导纳矩阵原理实现谐振稳定性分析的完整方法。该方法分2个阶段完成,首先在假定系统阻尼为0的条件下确定各谐振模态的无阻尼谐振频率、节点电压振型和最佳可控可观测节点;然后在考虑系统所有阻尼的条件下,基于系统降阶和系统辨识的思路,采用测试信号法精确计算出谐振模态对应的特征根。进一步还可计算出各谐振模态对特定元件参数的灵敏度。该方法避免了直接求解s域节点导纳矩阵行列式零点的困难,为在大系统层面开展电力系统谐振稳定性分析提供了可靠途径。The issue of resonance stability has become increasingly prominent in the context of new type power systems,with lack of effective methods for its analysis at the large scale system level so far.The definition and mechanism of resonance stability are given,and a complete method for achieving resonance stability analysis based on the principle of s-domain node admittance matrix is proposed.The proposed method is completed in two stages.Firstly,the undamped resonant frequency,the node voltage mode shape and the best controllable and observable node of each resonance mode are determined under the assump⁃tion of zero system damping.Then,based on the ideas of system order-reduction and system identification,the eigenvalue corresponding to each resonance mode is accurately calculated by the test signal method,with all damping of the system considered.Further,the sensitivity of each resonance mode to some specific component parameters can be calculated.The proposed method avoids the difficulties of directly solving the zero point of determinant of the s-domain node admittance matrix,and provides a reliable approach for conducting resonance stability analysis of large scale system level.

关 键 词：谐振稳定性 s域节点导纳矩阵 谐振模态 无阻尼网络 有阻尼网络 分流比 测试信号法 

分 类 号：TM712[电气工程—电力系统及自动化]