Research Of Predictive Control Of Permanent Magnet Synchronous Generator Based On Dual PWM Converter

Permanent magnet synchronous generator based on dual PWM converter system can realize the active power control of permanent magnet synchronous generator,the unit power factor operation of grid-side and the green transmission of energy.Therefore,it has a good application prospect in new energy generation system such as wind energy.Among many control strategies used in this system,predictive control has attracted wide attention.it has the advantage of the simple structure,easy implementation and excellent dynamic and static performance.In this paper,it is valuable to improve the predictive control on the grid-side of permanent magnet synchronous generator based on dual PWM converter system.Firstly,the system structure diagram of permanent magnet synchronous generator based on dual PWM converter is given,and the basic principles of PI control are expounded respectively.In order to carry out comparative study,The principles of deadbeat predictive control on the generator-side and model predictive control on the grid-side are introduced respectively.In order to achieve the unfixed switching frequency of the model predictive control on the grid-side,the optimal voltage vector which makes the objective function minimum is analyzed and deduced on the beat in advance.And it makes the model predictive control changed from directly selecting the switching state of power devices to giving the optimal voltage vector to implement the control,therefore it becomes compatible and integrated with the SVPWM technology.And it can not only retain the advantages of SVPWM technology with fixed switching frequency but also enjoy the control performance improvement brought by model predictive control.Next,the comparative simulation and experimental study of the above strategies are carried out.The results show that compared with PI control,the improved model predictive control scheme with fixed switching frequency has smaller current ripple and power ripple.From the comparative study,we can see that the improved model predictive control is correct,feasible and effective.