Predictive Direct Power Control For Grid-Connected Converter Of The Direct-drive Wind Power Converter System With PMSG

Conventional energy consumption and the environmental problems caused by it make the human demand for new forms of energy become more and more urgent.Because of its many advantages,wind power has been paid more and more attention by the country as a kind of clean renewable energy power generation.Meanwhile,wind power generation technology has become mature.More and more scholars and institutions Direct-drive have realized the importance of the wind power converter system with PMSG because of its simple structure.It is one of the important research direction in the field of wind power.The traditional direct power control strategy based on virtual flux for voltage source based PWM converter has characteristics of simple algorithm and the rapid response of power decoupling control.But its junction in the sector has a certain power fluctuation and there are all current harmonic,which is not conducive to filter design.After improvement of switch state table,it can reduce the fluctuations of the border to a certain extent,but still can not completely eliminate.But predictive direct power control strategy can control with fixed switching frequency and dead-beat predictive direct power control strategy does not need to be divided into sectors.Applying it to the voltage source PWM converter can overcome the shortcomings of traditional direct power control strategy and gain the good control effect.This article mainly discusses the grid-connected converter of the wind power converter system with PMSG and its predictive direct power control strategy is studied.Especially the dead-beat predictive direct power control strategy.Article detailed studies dead-beat predictive direct power control strategy and improves it.That eliminates the steady-state error of the power.Then,focusing on the proposed control strategy for voltage source based PWM converter,simulation and test have been performed to validate the proposed theory.The simulation and experimental results shows that the improved dead-beat predictive direct power control strategy has the correctness theory and engineering application value.At last,the improved strategy is applied to the wind power converter system with PMSG.Connect the machine with the grid and study the property of the parallel operation when the grideside's converter uses the dead-beat predictive direct power control strategy.A model has been set up to process simulation and experiment.Simulation and experimental results further verify the feasibility of the proposed control strategy.