Power Decouplimg Control For Doubly-FED Wind Power Generator Based On Intelligent Control

With the rapid technological development, energy consumption is growing and the environmental pollution is more and more serious, so that people have to consider new energy and renewable energy development and utilization. In a number of renewable energy sources, with its outstanding advantages wind energy get much world's attention. In wind power generation system, VSCF doubly-fed wind power generation technology has become today's mainstream because of its low cost, high efficiency characteristics. In this paper, decoupling control of double-fed wind power generator is studied.Firstly, the development of wind power at home and abroad and power decoupling control Research are introduced; starting from the basic principles, the mathematical models of wind speed, wind turbine and the double-fed wind power generator in different coordinate system are bulit, and steady-state operation of it is analyzed. Secondly, the power decoupling control based on the stator flux oriented vector control is studied, and a mathematical model of decoupled control system is given; on this basis, the double-loop control model is built. Again, aiming to the traditional PI regulators of power outer loop being poor self-regulation capacity and following poor performance shortcomings, a BP neural network PI controller which is the combination of neural network and the PI regulator is designed. For the BP neural network PI controller performance simulation, simulation results show that the BP neural network PI controller has better dynamic performance.Power decoupling control system based on BP neural network PI controller is created in the MATLAB software. System simulation is taken at different wind speeds, and simulation results show that the control system not only achieves the completely decoupled of power for double-fed wind power generation system, but also the control system output power has better tracking performance, system performance and stability under the changes in wind speed,and it has good dynamic performance.