双馈风力发电机变流器前馈二维模糊自整定PID控制

Feed forward two-dimension fuzzy self-tuning PID control for the converter employed by DFIG

针对双馈风力发电机(DFIG)变流器直流母线电压稳定性问题,采用转子电流空间(综合)矢量模值变化率(dAir/dt)在线修正PID参数的模糊自整定PID方法,建立了基于该控制策略的变流器系统模型,并给出了在电网电压跌落扰动及工作状态切换扰动下,变流器直流母线电压的仿真曲线。结果表明相对于普通PID及普通模糊自整定PID控制器,基于dAir/dt的模糊自整定PID控制器进一步改善了变流器直流母线电压的稳定性,并且该新型控制器具有易于实现,不增加硬件成本的优点,因此,具有很好的工程应用前景。

For the stability of DC bus voltage in the converter served for DFIG,a new fuzzy PID control strategy with parameters self-tuning was proposed based on the change rate of the rotor current space vector modulus value（dAir/dt）.The model of converter was set up in Matlab/SIMULINK with the new control strategy.The DC bus voltage response curves under symmetry grid fault disturbance and operation switching disturbance were given.The simulation results show that the new fuzzy PID controller with parameters self-tuning has been greatly improved in reducing the fluctuation of the DC bus voltage compared with the ordinary PID as well as fuzzy PID.Moreover,the new controller is easy to be realized without any new hardware equipment and has good engineering application prospect.