A Combined Physics and Data Driven Method for Broadband Impedance Online Estimation of Renewable Power Plants

Obtaining the broadband impedance of renewable power plants is a prerequisite for conducting oscillation risk analysis of renewable power integration system. This paper proposed a method for online estimating the broadband impedance of renewable power plants with Kirchhoff's law, based on the topology parameters of collecting power lines and the broadband impedance of renewable power units such as wind turbine under different steady-state conditions. By frequency sweeping of wind farm, it was verified that the proposed method could accurately identify the width-bandwidth impedance of wind farm, which is of great significance to the broadband oscillation risk online assessment of renewable power integration system.