基于随机子空间的光伏阻抗辨识

Photovoltaic Impedance Identification Based on Random Subspace

目前次同步振荡稳定分析方法大多针对模型进行分析,而实际中很难直接得到光伏模型。建立光伏的状态空间模型,提取光伏电公共连接点dq轴电流和电压,应用随机子空间方法分析光伏的传递函数模型。在仿真平台上搭建光伏模型,验证随机子空间方法的有效性。最后,从实际振荡录波数据和仿真数据以及理论分析3个方面对光伏振荡现象进行研究,为实际中光伏的次/超同步振荡监测和预警提供了一种切实可行方法。

For the current stability analysis methods of sub-synchronous oscillation,most of the characteristics are analyzed by models,but in practice,photovoltaic models are difficult to obtain directly.The state space model of photovoltaic was established,and the dq-axis current and voltage of the photovoltaic power plant were extracted.The random subspace method was used to analyze the photovoltaic transfer function model.A photovoltaic model was built on the simulation platform to verify the effectiveness of the random subspace method.Finally,according to the data of sub-synchronous oscillation recording of an actual photovoltaic power plant,it is concluded that the phenomenon of sub-synchronous oscillation occurs during the recording of the photovoltaic power station.This method provides a feasible method for monitoring and early warning of sub-synchronous oscillation in actual practice.