基于多功能串联补偿器的感应电机优化控制

用户与电网的互动技术是配电网安全、高效运行的重要内容。首先,提出了采用多功能串联补偿器MFSC(multifunctional series compensator)的感应电机优化控制方法,通过灵活控制MFSC中的串联型电压源变流器,使其能够分别运行在电压补偿模式、自适应柔性软启动模式。在电网电压跌落期间,通过在故障相注入补偿电压快速恢复电机定子并网点电压,保证电机稳定运行;在感应电机启动期间,基于动态分压原理,通过注入变化的虚拟阻抗实现对机端电压的柔性调节,保证电机柔性启动冲击电流和谐波扰动均较小,启动过程平滑。然后提出了MFSC系统的优化控制策略及参数设计方法,仿真和实验结果验证了MFSC系统在感应电机中应用中的有效性和正确性。

Optimization Control of Induction Motor Based on Multifunctional Series Compensators

The interactive technology between customers and power grid is one important content to ensure the security and efficient operation of distribution network. In this paper, an optimization control method for induction motors is proposed using multifunctional series compensators(MFSC). By flexibly controlling its series voltage source converter, the MFSC can operate in voltage compensation mode and adaptive flexible soft-start mode, respectively. In the regime with grid voltage sag, the stator voltage at the grid connection point can be restored rapidly by injecting the compensation voltage in fault phase, thus ensuring the motor''s stable operation. In the regime where the induction motor starts, based on the voltage-division principle, the flexible control of the motor''s terminal voltage can be realized through injecting the varying virtual impedance, thus keeping the surge current and harmonic distortion smaller during the motor''s flexible soft-start and ensuring a smooth starting process. An optimization control strategy for the MFSC system is proposed, together with a design method for its parameters. Finally, the effectiveness and correctness of the MFSC system when it was applied to an induction motor were verified by simulation and experimental results.