双绕组感应发电机具有随负载变化调节励磁磁场、保持负载电压恒定不变的优点,通过静止励磁调节器输出的有功电流控制母线电压、无功电流控制负载电压,两者经过坐标变换形成反馈电流,实现系统的闭环控制。锁相环(PLL)为坐标变换提供相位信息,选用合适的PLL可以提高坐标变换的动静态性能,为控制系统提供快速准确的反馈信息。分析了双绕组感应发电机励磁电压的特点,分析了双dq变换PLL、延时信号对消PLL、基于延时信号对消的滑动平均滤波PLL的各自工作特点,最后优选了基于延时信号对消的滑动平均PLL检测励磁电压相位。

The dualwinding induction generator had the advantage of adjusting the excitation magnetic field while keeping the load voltage constant for the step change in load. The active current of the static excitation regulator controlled the bus voltage and the reactive current controlled the load voltage. Both of them form the feedback current for the closed loop control of the system. Phase locked loop (PLL) provided phase information for coordinate transformation. Appropriate PLL could improve the speed and accuracy of coordinate transformation, and provide fast and accurate feedback information to the control system. The characteristics of excitation voltage of dual winding induction generator was analyzed, and the different working characteristics of double dq transformation PLL, delayed signal cancellation PLL and delayed signal cancellation based moving average filtering PLL were compared. Finally, the simulation of the dual winding induction generator system with three different PLL were carried out, and delayed signal cancellation based moving average filtering PLL was found to be the best one.

TM 346