基于转子电流偏差角的双馈感应电机速度观测

Speed and Position Observer of DFIG Based on Rotor Current Vector Angle Deviation

提出一种基于转子电流偏差角的双馈感应电机(DFIG)闭环速度观测方案。相比基于定子磁链或基于转子电流的模型参考自适应系统(MRAS)速度观测方案,该方案所构造的速度观测器不仅具有较好的线性化控制特性,而且其前向控制增益不受双馈感应电机转子电流量值的影响,从而使得所设计的DFIG无速度传感器控制系统具有较好的动态响应特性。2MW双馈感应电机的仿真试验,不仅验证了该无速度传感器控制策略的正确性,而且通过与基于转子电流MRAS无速度传感器控制策略的对比表明,该控制策略具有较好的动态响应特性。

By further study on the previous position-observing schemes for doubly fed induction generators （DFIGs）, an improved observing scheme based on rotor current vector angle deviation （RCVAD） is proposed. In contrast to stator-fluxbased or rotor-current-based model reference adaptive system （MRAS） position observing schemes, the RCVAD-based observer has good characteristics of linearity, and its forward control gain is independent of DFIG rotor current value. Consequently, the DFIG sensorless control system has better dynamic performances. Simulations on a 2 MW DFIG validate the correctness of the proposed sensorless control strategy, and its preferable dynamic performances are confirmed by comparing with the rotor current-based MRAS position observer.