Study On Control Strategies For Direct-driven Wind-power Generation System Based On Two Stage Matrix Converter

At present,direct drive wind power generation system based on permanent magnet synchronous generator (PMSG) has been developed rapidly. Multi-pole permanent magnet synchronous generator rotor is directly connected with wind turbine without growth gearbox because of the synchronous speed is low which has little maintenance, high efficiency ,small impact on the grid. The direct drive wind power group based on permanent magnet synchronous generator has more advantages than the double-fed wind power generation system in low-voltage operation which along with a flexible reactive power control capability .It is main component of power converter that direct drive permanent magnet wind power system. The power converter used in this article is a two-stage matrix converter it is new power converter topology and has the following advantages: degree of freedom control is large, output voltage and input power factor is adjustable, the power can flow in both directions, function with four-quadrant operation. it is compared with the traditional back to back converter that its structure is compact, small size, high efficiency, implement modular easily because of TSMC without intermediate energy storage (large capacitors). Because of these advantages, It is very suitable for TSMC as power converter of direct-drive wind power system. In this paper, the TSMC is used direct-drive permanent magnet synchronouswind power system and it is studied which the control strategy of direct-drive wind power system based on TSMC. First of all, its circuit structure and control principle is analyzed and discussed. And it is proposed for integrated control strategy and The integrated control of the whole system is achieved throuth the inverter stage of TMSC. It is achieved for grid control, maximum power capture, power decoupling control and variable speed constant frequency control, but it also has a strong low pressure crossing ability. Secondly, on the basis of this system expert adaptive PID instead of the traditional PID and analysis of this system. The system which making use of expert adaptive PID has anti-interference ability, no overshoot, good robustness and so on. Finally, The system model is completed by matlab simulation software and these results correctness be verified.