Predictive Direct Power Control Strategy For Direct-driven Wind Power Generation System With Two Stage Matrix Converter

Wind power is a important energy in the new energy, improving the output power of wind power system in the dynamic and static performance has become one of the key research in the field of wind power. Direct-driven permanent magnet synchronous wind power system is good at the gearless synchronous generator structure, low maintenance costs, high operating efficiency, so the wind power is becoming a mainstream system. Basing on the traditional dual PWM converter direct-driven wind power system control strategy is complex, and the coordination control for the machine side and network-side, extra protection on the DC side of the device, these are not conducive to system cooling and system cost, makes the wind power systems complicated. Two-stage matrix converter(Two-stage matrix converter, referred to as TSMC) has excellent input and output performance, compared to conventional power converter structure, it is without the intermediate DC energy storage components, and the structure is compact, thus has great value in the wind power system. In this paper, based on TSMC ’s direct-driven permanent magnet synchronous wind power systems is studied, proposed to predictive direct power control strategy(Predictive direct power control, referred to as P-DPC) is applied to the system to improve the dynamic and static performance of the system.Firstly,this paper describes the topology and characteristics of TSMC, TSMC analyzed the working principle of Space Vector Modulation(SVPWM); Thirdly, introduces the significance and status of TSMC’s direct-driven wind power system, the circuit structure and work principle of the system were analyzed and studied. A mathematical model of permanent magnet synchronous generator is established. TSMC’s direct-driven wind power system integrated control strategy is analyzed, controlling the grid side of TSMC’s inverter of direct-driven wind power system to achieve the grid control, MPPT control, output reactive and active power decoupling control, variable speed constant frequency control. By using Matlab/Simulink simulation platform, the control strategy was validated. Finally, proposing the TSMC’s direct-driven wind power system P-DPC strategy, compared to the PI control strategy, this strategy is allowing the output of active and reactive power decoupling system for better performance, make the dynamic response more quickly and better static performance. By Matlab / Simulink platform, P-DPC was established based on the TSMC’s direct-driven wind power system simulation model, simulation results verify the feasibility and effectiveness of the proposed control strategy.