Equivalent Modeling Method of Wind Farms under Various Operating Conditions for Wideband Oscillation Analysis

Abstract

Wideband oscillations seriously threaten the stable operation of power systems. The wind farm modeling is the basis of wideband oscillation analysis, but the accurate model of wind farm is of high order and is not available, impeding the analysis of wideband oscillations. Hence, this paper proposes an equivalent modeling method based on the wind speed-frequency two-variable admittance model. Firstly, the relationships between the steady-state variables of permanent magnetic synchronous generator wind turbine (PMSG-WT) and wind speed are deduced. Then, the wind speed-frequency two-variable admittance model can be obtained. Finally, the equivalent model in d-q frame based on two-variable admittance model is established. With the proposed equivalent modeling method, the dynamic equivalent modeling of wind farms under various operating conditions can be realized. This work significantly accelerates the simulation and is adaptable to wideband oscillation analysis. Simulation results have verified the feasibility and validity of the proposed method.