Design And Research Of Wind Power Generation Speed Controller Based On Fuzzy Control

Wind energy is randomness, sudden and uncertainty; wind power generation system is a strongly coupled and nonlinear complex system and the mathematics model of generation system is complex.At the same time, it is easy to change with the changing of static operating point, so it has severe time-varying and nonlinear characteristics. In the design of the control system, conventional PID controller has the advantages of simple structure, high reliability, and it can satisfy the control requirements of most systems, which has been widely used in practical engineering. However, the design of the conventional PID controller needs to know the exact model of the object, and control parameters of it are fixed. It is difficult to carry out a good control for some complex controlled objects with high degree of time variation and nonlinearity. It can be designed by the reference of input and output conditions of actual system and operator’s experience,without a exact mathematical model. And the fuzzy control has the advantages of strong robustness, disturbance and less influence on the control performance with parameter variation. It is especially suitable for the control of complex wind power generation system which is nonlinear, time varying and time delaying.The research object is the fixed pitch wind power generation system. The design of double closed loop control system,which including the current loop and speed loop, has been designed based on permanent magnet synchronous motor vector control, and the speed outer loop controller has been designed in a new way using fuzzy control theory.Firstly, under different wind speed conditions, the static and dynamic properties have been detailed analysis, comprehensive control strategy has been adapt.In the specific implementation, the vector control of PMSG is based on PWM rectifier, In the design of speed loop,the paper adopted the wind turbine gas dynamic torque feedforward which effectively eliminated the system’s inherent instability.On the basis of this, the fuzzy self-tuning PID controller is designed, and its advantages and disadvantages are analyzed by simulation experiment. According to its deficiency, the design has been improved from two aspects,by putting forward the improved fuzzy self-adjusting PID control,followed by further validation of its control performance.Finally, through the simulation and hardware in the loop experiment platform,the control performance of IFSA-PID controller has been verified. The experimental results show that: under control of IFSA-PID, wind turbines can run stably in all operating wind speed with a good performance not only for MPPT in low wind speed but also for constant power control in high wind speed and has better dynamic characteristic, anti disturbance and robustness compared with the conventional PID controller.