引入比例谐振调节器的双馈电机转子电流无速度传感器控制

双馈风力发电机转子电流模型参考自适应系统(MRAS)的转速估算方法中,由于定、转子电压、电流采样信号的漂移及AD转换的偏差,致使所估计的双馈电机转速幅值中呈现不同程度的交流脉动。针对此问题,提出了在自适应实时调节机构中,采用PI并联比例谐振(PR)控制器共同作用的控制策略。该方法可消除转速估计中角频率和转差频率的交流脉动,实现转速精确估计,提高双馈电机发电质量。基于10 k W的双馈风力发电模拟平台进行了实验研究,通过与PI控制对比验证了PI并联比例谐振控制的优越性。

Rotor current speed sensorless control of doubly-fed induction generator based on proportional resonant regulator

In the Model Reference Adaptive System (MRAS) rotor estimation method based on Doubly-Fed Induction Generator (DFIG) rotor current, the estimation speed amplitudes of DFIG show different degrees AC ripple because of stator, rotor voltage and current sample signal drift and AD transform deviation. On this basis, a control strategy based on PI and Proportional Resonant (PR) controller is proposed in the adaptive adjusting mechanism. AC ripple in the speed estimation caused by the angular frequency and slip frequency can be eliminated in the proposed method, accurate speed estimation is achieved and the power generation quality of doubly fed generator is improved. Experiments are carried out based on 10 kW doubly fed wind power generation simulation platform, the superiority is verified by comparing with PI control and PI parallel proportional resonant control. This work is supported by National Natural Science Foundation of China (No. 51207002), Industrial Science and Technology Research of Shaanxi Province (No. 2013K07-12 and 2016GY-130), and Natural Natural Scientific Research Program Funded by Shaanxi Province (No. 2014JM8347).