【摘要】 针对双馈式变速变桨风力发电机并网系统,对其控制技术进行研究,提出了一种基于链系统理论的转子电流控制方法,建立起了变速变桨发电机结构分散化并网控制器模型,它由2个单元模型、2条因果链和2支链间关联的模型构成。在此模型的基础上,根据链系统的预估机制和控制方案,给出了以发电机转子的d轴电流、q轴电流为受控量的关联系统的结构分散化控制算法。仿真结果表明,该新型控制方法与传统的PI控制方法相比,不仅不需要进行常规控制时繁琐的PI参数整定,而且可以使得发电机转子的d轴电流、q轴电流在有限时间内迅速到达参考值,实现快速收敛和较好的跟踪精度。更多还原

【Abstract】 In view of doubly-fed variable speed and pitch wind turbine grid-connected system, this paper deals with its control strategies in detail and proposes a rotor current control method based on the chain theory. A controller is built, which consists of two unit models, two causality chains and an association model between two chains. On the basis of this model, according to the prediction mechanism and the control scheme, the decentralized control algorithm is designed for the connection system with the d-axis current and q-axis current as its controlled outputs. The simulation results show that this new control method not only avoids the cumbersome PI parameter tuning, but also can acquire the reference values of the generator d-axis current and the q-axis current in finite time and obtain a faster convergence and better tracking precision compared with the conventional control methods. It has important practical significance and application value.更多还原