并联直流变换器网络控制系统的信号传输时延补偿滑模控制器设计

The networked control system (NCS) of parallel DC/ DC converter is always affected by the signal transmission delay and loses its ideal output performance. For a typical shunt Buck converter, a sliding mode controller(SMC) in discrete domain was designed to enhance the robustness of the system. Based on this, the effects of different types of time delay on the stability of the converter NCS were analyzed, and the actual effects of long/ short time delay on the converter NCS were obtained. In order to further solve the problem of damage to NCS transmitted signals by long delay, the SMC controller designed was improved based on multi-step prediction method, so as to effectively predict and compensate the delay signals lost by NCS and ensure the output performance of the shin-parallel Buck converter. Meanwhile, the stability conditions of the improved system were given by using prediction error analysis. Simulation and experiments demonstrate the superiority of the proposed method. At 0. 6 ms delay, the maximum error and rise time are reduced by 37. 4% and 61. 3%, respectively.