| Because of the special advantage, wind power industry has developed rapidly in recent years. To promote the development of wind power, it is important to take research on the safe stability of the power system with wind power integration. At present, most of the studies of large-scale wind power integration are based on PSASP, BPA, etc. However, since these models are simplified, the rapid transient process of wind generator cannot be reflected accurately. Although the electromagnetic transient model of wind turbine can be built detailedly based on PSCAD, MATLAB, etc, it cannot establish a large-scale power system model because of the limit on the simulation speed and scale. Advanced Digital Power System Simulator (ADPSS) combines the advantages of electromechanical transient simulation and electromagnetic transient simulation, and then realizes electromagnetic-electromechanical transient hybrid simulation of the large-scale power system. Electric locomotive integration creates serious power quality problems in the actual power grid. And it may produce serious influence on secure and stable operation of wind turbines. But the research on this issue is less at present. Therefore, it is necessary to establish electromagnetic transient model of wind turbine and electric locomotive based on ADPSS, and then study the electromagnetic-electromechanical transient hybrid simulation with electromechanical transient model of power grid. It not only can guarantee simulation speed and size but also reflect the rapid transient process. Hence, it provides strong technical support for the deep study of the stability of power grid. This paper conducts the following research based on the hybrid simulation of power grid with wind farm integration.First, we describe the mathematical model of doubly fed induction wind generator (DFIG) and its control system. The model of DFIG includes wind speed model, wind turbine model, shaft model, doubly-fed induction generator model, back to back converter model and the control system including maximum power point tracking control, pitch control, and converter control.Second, based on ADPSS, we establish the electromagnetic transient model of wind turbine and perform the hybrid simulate of electromagnetic-electromechanical transient with electromechanical transient model of power grid. Based on the mathematical model of DFIG, we establish the electromagnetic transient model of wind turbine based on ADPSS. Then, we study the response of wind turbine when the wind speed changes and verify the correctness of the model. With the electromagnetic transient model of wind turbine and electromechanical transient model of power grid, we built the electromagnetic-electromechanical transient hybrid simulation model of power grid containing wind farm. Then we study the response of wind turbine and power system when the wind speed changes or power failure. This research provides a good technology platform to the deep study of the stability of power grid.Finally, we built an electromagnetic-electromechanical transient hybrid simulation model of power grid containing traction power supply system and wind farms, and study the influence of the traction power supply system on the wind turbines. We analyze the principle of Shaoshan 4(SS4) locomotive and the influence of the traction power supply system on the wind turbines. An electromagnetic-electromechanical transient hybrid simulation model of power grid containing traction power supply system and wind farms is built based on ADPSS. It can provide a simulation platform for the study of the stability of power grid with wind farm and electrified railway. Then we study the influence of the traction power supply system on wind turbines under various working conditions, and verify the correctness of the theoretical analysis. Our study can provide a reference for power system operation and planning. |
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