Study of Self-Tuning PI Controllers in a Constant Voltage Control System for Doubly-fed Wind Turbines
نویسندگان
چکیده
The doubly-fed induction generator (DFIG) produces the reactive power to maintain its constant voltage operation. Firstly, the principle of the constant voltage control system for double-fed wind turbines is researched, and the influence on DFIG terminal voltage when the wind speed changes and the grid voltage sags is analyzed. Secondly, self-tuning PI control algorithm based on BP neural network is proposed. This algorithm realizes the dynamic setting of PI parameters in the process of wind speed change and grid voltage sag, and then builds a simulation model of the system. The simulation results show that the constant voltage control system using the dynamic setting of PI parameters based on BP neural network has improved the stability of grid-connected voltage for doubly-fed wind turbines and reduced the response time in the process of wind speed change and grid voltage sag.
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