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Real-time Simulation of Large-scale Wind Farm Based on Improved Transmission Line Decoupling Model

In order to study the impact of large-scale wind farms on the security and stability of power grids, efficient simulation of large-scale wind farms becomes very important. In this paper, a transmission line decoupling method is proposed and a power equivalent model is built. An equivalent system of a large-scale wind farm was modeled with the proposed equivalent model and a permanent magnet synchronous generator based wind turbine. To validate the proposed method and model, the equivalent system is implemented with CloudPSS platform. The accuracy of the power equivalent model is verified by comparing with electromagnetic transient simulation results between the proposed model and a conventional wind farm model. Moreover, the power equivalent model greatly improves the simulation efficiency of the large-scale wind farm and makes it meet the real-time simulation requirements. In the case study, the large-scale wind farm equivalent model is added to a distribution network and a real-time simulation is performed. The real-time capability and correctness of the model are verified by comparing with the results between real-time and offline simulations. The model proposed in this paper can also be used for renewable energy stability analysis and hardware-in-the-loop (HIL) testing.