【摘要】 提出一种具有开绕组结构的无刷双馈风力发电机及其控制系统,开绕组无刷双馈发电机(OW-BDFG)是将控制绕组全部打开,在其两端各接一个变频器对OW-BDFG进行控制。该种拓扑结构可独立控制各相控制绕组电流,大大加强了控制的灵活性和系统的故障冗余能力,且所需变频器容量更小,开关频率较低。针对OW-BDFG特殊结构,提出一种基于功率误差比较的直接功率控制(PEC-DPC)方法对OW-BDFG的有功和无功功率进行解耦控制,以实现功率跟踪。该种控制方法结构简单,易实现,计算量小,动态响应快,且无需观测磁链大小,实时性好。最后,通过仿真比较和实验研究,验证了所提出OW-BDFG及其PEC-DPC系统的可行性和优越性。更多还原

【Abstract】 A brushless doubly-fed wind power generator with open-winding structure and its control system are proposed. The open-winding brushless doubly-fed generator( OW-BDFG) means that the control winding is opened completely and its two ends are respectively connected to an inverter to control the OW-BDFG. This topology structure,which has smaller inverter capacity and lower switching frequency,can independently control each phase current of the control winding to enhance the control flexibility and fault redundancy ability of the wind power system. Moreover,for the special structure of the OW-BDFG,a power error comparison direct power control( PEC-DPC) method is proposed to implement the power tracking through the decoupling control of the active and reactive powers of the OW-BDFG. This control method has the properties of simple structure,easy realization,small computational amount,fast dynamic response,as well as good real-time performance without observing the flux amplitude. Finally,the feasibility and superiority of the proposed OW-BDFG and its PEC-DPC system are verified through the simulation comparison and the experimental study.更多还原