| With the rapid development of wind power,"grid-friendly" concept is proposed. Operators put forward higher requirements on the quality of output power and have the increasing expectation that wind turbines should function in some ways similar to the conventional power plants. How to use the wind energy effectively becomes a crucial issue.Many approaches about improving the active power quality have been proposed by scholars. Such as the multi-model control strategy and the advanced algorithms control strategy. In addition to the ability to regulate the active power based on the grid dispatch, accurate wind turbine models and good control strategies are required. This paper presents the active power control strategy of DFIGs based on grid dispatch under all regions of wind speed through reading a lot of domestic and foreign references.Firstly, this paper introduces the basic principles and operation features of WTGs. Secondly, this paper establishes a large scale wind power plant simulation model whose installed capacity is6×1.5MW based on Matlab/Simulink, and chooses a1.5MW double-fed induction generator for the main analysis object. Thirdly, this paper divides the operation of WTGs into three parts. Different from the traditional maximum wind energy tracking control strategy, the three parts are separately controlled. Additionally, the paper designs a hysteresis controller to decrease fluctuations of active power. Finally, this paper designs a wind feed-forward of fuzzy PID controller through the study of the linear models operating characteristics under typical wind speeds for high wind speed operation mode. Simulation results show that the sub-regional coordination control scheme can effectively guarantee the stability of the output power under all regions of wind speed. Simultaneously, the new wind feed-forward of fuzzy PID controller can effectively reduce power fluctuations and accelerate the system response speed when the wind speed mutated. |
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