Sliding Mode Control Of AC/AC Quantum Resonant Converter

Nearly all the scientific and technological achievements have adopted the electronic technology in some degree. Power converter have been widely used in switching power supply of industry, aerospace and other fields, the methods of modeling and control which are associated with power converters have also been a rapid development, but it's still one of the topics that researchers focus on. Power converter is a nonlinear time-varying system with complex dynamic characteristics. But many modeling methods have a vague physical concept and it is difficulty to modeling, and traditional linear control methods are not suitable to the strongly nonlinear system. Compared to other kinds of converters, the research on the AC/AC converter is lagging behind, the modeling and control methods toward the AC/AC converter are few, which have greatly limited the research and the apply on the AC/AC converter.In this paper, we will introduce a converter called AC/AC quantum resonant converter which can realize the voltage step-down. By the reason that the output voltage has severe ripple wave and the robustness, dynamics response are far away from the expectations when the converter works on the open loop condition. After analyzing the operation principle of the converter, the main work of the paper are setting up the modeling and designing the sliding mode variable structure controller. The concrete work is finished step by step, and the details are explicit:At first, we analyze the operation of the AC/AC quantum resonant converter and then set up the state space model. By the analysis of the relations of the resonant inductor current, resonant capacity voltage, the input and output voltage and current, we get the reduced-order state space model, which can describe the system much more clear and are beneficial to the design the controller. By applying the averaging method to the reduced-order state space model, we get the averaged large signal model at last, which can describe the dynamics behaviors of the system completely.Then, with the help of the averaged large signal model, we apply the sliding control theory to design a sliding mode controller for the AC/AC quantum resonant converter.Third, in the Matlab/Simulink environment, we project the open loop system and closed loop system simulated diagram of the AC/AC quantum resonant converter. By giving the disturbance to the input voltage and load, we can see the closed loop system reach the expectations on the robustness, dynamics response and steady-state error, which verifies the feasibility of the sliding mode controller.Finally, this paper design the AC/AC quantum resonant converter control system on the DSP and give an interpretation on the hardware and software design.