Single-phase M-channel interleaved and N-switch Paralleled power factor corrector using EL model passivity control

摘要

For high-power home inverter air conditioners and other electrical equipment which are supplied by single-phase AC power source, single-phase power factor correction (APFC) is needed. For example, multi-level interleaved APFC or single-level APFC with multiple power devices in parallel. This paper proposes a new single-phase M level and N power devices in parallel PFC which is driven by shift phase control method. Then the paper analysis its circuit structure and working principle, including voltage transformation ratio, ripple current, driving method and control methods. This MN APFC can transmit high power and reduce the switching frequency of the power devices. This circuit structure simplifies the selection of power devices. Meanwhile, it can also maintain the operating frequency of the boost inductor unchanged or maintain the switching frequency of the power device constant. This control method improves the operating frequency of the boost inductor several times and simplifies the inductor design. This paper establishes the EL (Euler-Lagrange) mathematical model of MN PFC which is working in continuous conduction mode (CCM) based on its power circuit. The passivity of MN PFC is proved and passivity-based controller using stated variables feedback, damping injection method is designed in this paper. The proposed control scheme which don't need proportion integral controller has strong robustness on disturbance of input voltage, load and parameters of system components. Especially in applications of wide range load, the dynamic response of input current is very fast and the output voltage almost has no changes so that the power factor correction and constant DC output functions of PFC are realized. Meanwhile, MN PFC employing passivity-based controller has a good effect on current sharing. Then, as 2×2 PFC for example, this method is simulated and analyzed by MATLAB/SIMULINK. Simulation results show that the passivity-based controller has a superior performance and the method is feasible.