Electromagnetic Transient Controlled Source Based Decoupling Acceleration Model for Large-scale Offshore Wind Farm

With the increase of installed capacity and proportion of wind power, the problem of extremely slow electromagnetic transient simulation speed of large-scale wind farms is becoming more and more prominent. In view of the complexity of the existing modeling methods, the inability to reflect internal characteristics of the wind farm, and the lack of flexibility, this paper proposes an electromagnetic transient controlled source based decoupling acceleration model (CS-DAM) for the large-scale offshore wind farm. This method realizes the decoupling between the internal components of the wind turbine (WT) and the ports between different WTs by transmitting the voltage and current information between the ports through the controlled source, so that the high-order matrix in the system solution process is decomposed into multiple small matrices to achieve simulation acceleration. The effectiveness of the method is proved based on the node analysis method and Kirchhoff’s law. The proposed modeling method of CS-DAM, which can build a model by dragging existing modules in the simulation software, is simple. The CS-DAM can accurately simulate various transient and steady-state conditions of the wind farm, and the acceleration effect is obvious. Meanwhile, the proposed CS-DAM can complement the methods proposed in the existing literature and expand their flexibility. Finally, wind farm models with different numbers of WTs are built in PSCAD/EMTDC to verify the simulation accuracy and acceleration effect of the CS-DAM. The results show that the proposed CS-DAM can achieve acceleration effects of 1~2 orders of magnitude, and has higher simulation accuracy compared to the detailed model. © 2024 Automation of Electric Power Systems Press. All rights reserved.