摘要
为了实现背靠背变流器和异步电机驱动系统的四象限运行、能量双向流动、网侧单位功率因数、直流母线电压可控,本文采用线性自抗扰控制和滑模控制相结合的控制策略。网侧变流器电压环采用线性自抗扰控制,电流环采用滑模控制,提升了网侧子系统的抗干扰能力;机侧变流器速度环及磁链环采用线性自抗扰控制,电流环采用滑模控制,保证了网侧子系统的直流母线电压恒定时再进行机侧子系统的起动。异步电机四象限运行开始时存在较大电压超调的问题,采用网侧子系统电压软给定方法,减小电压超调。对于负载转矩未知的情况,采用负载转矩观测器进行观测。仿真结果表明,该控制系统实现了异步电机的四象限运行,对异步电机的未知负载转矩值跟踪快速且精确,实现了异步电机四象限驱动系统在单位功率因数下运行,线性自抗扰与滑模控制能很好地保证网侧直流电压达到给定值,并保持恒定,虽然在电机状态切换时,直流母线电压有波动,但很快恢复到给定值,电压定向控制存在一定的稳态误差,且误差随电机状态的切换越来越大。该研究在工业传动领域具有广阔的应用前景。
In order to realize four-quadrant operation, energy bidirectional flow, and controllable grid side unit power factor and DC bus voltage for back-to-baek converter and asynchronous motor drive system, a combination of linear auto disturbance rejection control and sliding mode control is adopted. The grid-side converter voltage loop adopts linear auto disturbance rejection control, and the current loop adopts sliding mode control to improve the anti-interference ability of the network side subsystem;the machine side converter speed loop and the flux link loop adopt linear auto disturbance rejection control. The current loop adopts sliding mode control to ensure that the DC side bus voltage of the network side subsystem is constant when the machine side subsystem is started. For the problem that there is a large voltage overshoot at the beginning of the four-quadrant operation of the asynchronous motor, the voltage softening method of the network side subsystem is adopted to reduce the voltage overshoot. For the case when the load torque is unknown, the load torque observer is used for observation. The simulation results show that the control system realizes the four-quadrant operation of the asynchronous motor, and the unknown load torque value tracking of the asynchronous motor is fast and accurate. The four-quadrant drive system of the asynchronous motor is operated under unit power factor, linear auto disturbance rejection and sliding mode control can well ensure that the DC voltage on the grid side reaches a given value and remains constant. Although the DC bus voltage fluctuates when the motor state switches, it quickly returns to the given value, and the voltage orientation control has a certain steady state error, which is changing with the state of the motor. This research has broad prospects in the field of industrial transmission.
作者
张晖鹏
于海生
刘旭东
吴贺荣
ZHANG Huipeng;YU Haisheng;LIU Xudong;WU Herong(College of Automation, Qingdao University, Qingdao 266071, China)
出处
《青岛大学学报（工程技术版）》
CAS
2019年第2期1-7,26,共8页
Journal of Qingdao University(Engineering & Technology Edition)
基金
国家自然科学基金资助项目(61573203,61703222)
关键词
异步电机
四象限
滑模控制
线性自抗扰控制
电压软给定
induction motor
four quadrant
linear auto-disturbance rejection control
sliding mode control
voltage soft setting
