中文摘要：

针对背靠背变流器和异步电机的多变量和强耦合特性,本文将滑模控制与反步法相结合,对异步电机四象限运行和能量双向流动问题进行研究。网侧变流器采用滑模与反步法相结合的控制策略,提升了响应速度和抗干扰能力;机侧变流器采用反步法控制器,并在此基础上,使网侧输出的直流电压稳态后再启动机侧运行。为验证本文设计方案的正确性,采用Matlab软件对异步电机四象限运行系统进行仿真分析。仿真结果表明,本设计方案能够达到网侧单位功率因数、直流母线电压稳定、异步电机四象限运行等目标;异步电机的转子角速度可以迅速达到期望值,速度跟踪性能良好,说明本文提出的设计方案可靠有效。该研究具有良好的应用前景。

英文摘要：

According to the characteristics of back-to-back converter and the multi variable and strong coupling of induction motor, this paper studies the induction motor four quadrant operation and bidirectional power flow problem, which combines backstepping with sliding mode control. F irs t, the combination of sliding mode and backstepping is utilized to improve the response speed and the ability to reject disturbance of the grid side con-verter. In addition, the backstepping controller is constructed in the motor side converter. Based on the above control strategies, the operation of motor is started when the DC voltage of the net side reaches a stable state. In order to verify the correctness of the proposed design scheme, the Matlab software is used to simulate the four quadrant operating system of induction motor. The simulation results show that the proposed scheme can achieve the goal of the net side unit power factor qualified, the DC bus voltage stable and four quadrant opera-tion of induction motor; The rotor speed of the induction motor can reach the desired value quickly, and the speed tracking performance is good, which shows that the design scheme is reliable and effective. This research has a good application prospect.