考虑惯量增益与电网强度的VSC稳定性分析
VSC Stability Analysis Considering Gain of Inertia and Grid Strength
徐意 1李先允 1程爽 1陈兰杭2
作者信息
- 1. 南京工程学院 电力工程学院,南京 211167
- 2. 国网镇江供电公司,镇江 212002
- 折叠
摘要
在高比例新能源并网的背景下,电网的低惯量问题备受关注.虚拟惯量控制策略使得逆变器系统具备向电网提供惯量支撑的能力,然而其与控制环节与电网间存在耦合,对系统稳定性有一定影响.在目前的应用场景中,惯量增益和系统稳定的平衡点难以权衡.针对这一问题,首先根据系统主电路结构及相应控制策略建立采用虚拟惯量控制的并网VSC状态空间模型;其次利用特征根轨迹法及参与因子法对系统关键参数变化对系统稳定性的影响进行分析;最后在Matlab/Simulink中构建系统并进行仿真验证,进一步说明了模型的有效性和分析的正确性,为探索虚拟惯量控制的VSC系统适用场景做出了一定贡献.
Abstract
In the context of a high proportion of renewable energy grids,the problem of low inertia of power grids has attracted much attention.The virtual inertia control strategy enables the inverter system to provide inertia support to the power grid,but it is coupled with the control link and the power grid,which has a certain impact on the stability of the system.In current application scenarios,it is difficult to balance the gain of inertia and the balance point of system stability.In order to solve this problem,firstly,according to the main circuit structure of the system and the corresponding control strategy,a grid-connected VSC state space model with virtual inertia control is established,sec-ondly,the influence of the change of key parameters of the system on the stability of the system is analyzed by us-ing the eigenroot trajectory method and the participation factor method,and finally the system is constructed in Mat-lab/Simulink and verified by simulation,which further illustrates the effectiveness of the model and the correctness of the analysis,and makes a certain contribution to the exploration of the application scenarios of VSC system with vir-tual inertia control.
关键词
虚拟惯量控制/小信号模型/稳定性分析/参与因子分析Key words
virtual inertia control/small signal model/stability analysis/participation factor analysis引用本文复制引用
基金项目
江苏电科院科技项目(SGTYHT/21-JS-223)
国家电网江苏省电力公司科技项目(SGJSZJ00BGWT2311202)
出版年
2024
NETL
NSTL
万方数据