附加动能与势能比例系数的跟网型VSC能量函数
The Energy Function of Grid-Following VSC with the Additional Proportional Coefficient of Kinetic Energy and Potential Energy
杨元熙 1仲悟之 1王安斯 1倪丰毅1
作者信息
- 1. 中国电力科学研究院,北京 100085
- 折叠
摘要
针对大扰动下跟网型换流器的暂态稳定分析问题,构造了一种附加动能与势能比例系数的新型能量函数,改善了传统能量函数固有的保守性.根据待定梯度法计算能量函数的形式;以能量函数的正定性作为约束条件,初步确定附加系数的取值范围;根据梯度与微分方程判断能量函数的耗散性,进一步缩小了该范围;分析并对比能量函数的稳定域,提出改善保守性的建议.最后将得出的结论应用于并网换流器的电磁暂态仿真模型中,验证了其有效性.
Abstract
This paper proposes a new energy function with additional ratio coefficient of kinetic and potential energy for the transient stability analysis of grid-following converters under large disturbances,which improves the inherent conservatism of the traditional energy function.First,the form of the energy function is calculated based on the undetermined gradient method;second,with the positive definiteness of the energy function as a constraint,the range of additional coefficient is preliminarily determined;furthermore,the dissipation of the energy function is determined based on gradients and differential equations,further narrowing the range;thirdly,the stability domain of the energy function is analyzed and compared,and suggestions are proposed for improving conservatism.Finally,the conclusions obtained are applied to the electromagnetic transient simulation model of grid-connected converters,and the effectiveness is verified.
关键词
跟网型换流器/大扰动/能量函数法/梯度/稳定域/耗散性Key words
grid-following converter/large disturbance/energy function/gradient/stable domain/dissipation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据