笼型转子无刷双馈发电机的间接功率控制

Indirect power control strategy for brushless doubly-fed induction generator

针对无刷双馈发电机(BDFIG)在变速恒频风力发电系统中有功功率和无功功率的控制问题,提出一种笼型转子无刷双馈发电机并网后的间接功率控制方法。利用BDFIG统一坐标系模型推导出有功功率与控制绕组磁链幅值和相位增量之间的解析关系,在此基础上设计有功功率和无功功率的控制器,建立间接功率控制系统的结构框图。样机并网后的实验结果表明该方法能够实现有功功率与无功功率的控制。该方法无需进行旋转坐标变换,用到的电机参数较少,构成的控制系统结构简单。

An indirect power control strategy was proposed for the brushless doubly-fed induction generator (BDFIG) to realize active and reactive power control separately after it was connected to the grid, to resolve the issue that output of BDFIG should be controlled in the variable speed constant frequency wind power generation system. The analytic relationship of active power with the dynamic phase increment and amplitude increment of the control wind flux linkage vector was derived in detail by using unified reference frame dq model of BDFIG. Active and reactive power controllers were designed based on theoretical analysis and then the structure diagram of control system was established. Experimental results of the prototype show the active power and reactive power are controlled. In this presented scheme, the system structure is simple without rotating coordinate transformation and less machine parameters are needed.