Discrete Variable Structure Control Theory And Its Application In Power Electronic Devices

Variable structure control of discrete-time systems and its applications in power electronic apparatus are discussed in this paper. At first, variable structure control of continuous-time systems is reviewed briefly. After that, the problem of choosing sample time in the discretized variable structure control of continuous-time systems is analyzed. Some common methods of variable structure control for the discrete-time system are dissertated, and the discrete equation reaching conditions are improved . A new reaching law based on attenuating variable rate control which is verified as a chattering-free reaching law in theory is presented and its' correctness is validated by simulation. Meanwhile, design methods of chattering-free in the discrete-time systems are expounded and the strategies of robust control for the discrete-time variable structure control systems are discussed in emphasize, especially the robust discrete-time variable structure control strategy with the reaching law based on discrete attenuating rate control . In the end, some applications in the power electronic apparatus with the discrete-time variable structure control are introduced. The future development for the discrete-time variable structure control systems is also provided.