Control strategy of power conversion system based on sliding mode active disturbance rejection control
In order to improve the dynamic performance of the power conversion system(PCS),an improved active disturbance rejection control(ADRC)strategy based on reduced-order cascaded extended state observer(ESO)and complementary sliding mode control(CSMC)was designed and applied to the voltage outer loop of the bidirectional DC/AC converter in the PCS.The ESO was modified to a reduced-order cascaded ESO to improve the estimation speed of the state variables and the overall disturbance,enhancing the disturbance estimation capability.The PD control was replaced with CSMC to design a state error feedback law to enhance the robustness of the system,and an improved exponential reaching law was designed to suppress the chattering phenomenon.A simulation model was established and a related experimental platform was built to demonstrate the superiority of the improved ADRC strategy compared to PI control and traditional ADRC.The simulation and experimental results show that the improved ADRC strategy reduces the fluctuation of the DC bus voltage during the transient operation of the PCS,improves the power response speed on the AC side of the PCS,and enhances the output power quality on the AC side.
power conversion system(PCS)active disturbance rejection control(ADRC)reduced-order cas-caded extended state observercomplementary sliding mode control(CSMC)improved exponential reaching law
万方数据
维普
