Design And Research Of Hybrid Charger System Based On Wind Power And PV-Module Power Generator

Stand-alone regenerative power systems usually require batteries for energy storage. This thesis presents the design of the battery charger powered by both the photovoltaic (PV) module and the wind turbine generator (WTG). In the power converters, a single-ended primary inductance converter (SEPIC) is adopted. This is because the SEPIC has the features of the buck-boost operating mode, no polarity inversion, low input current pulsation, and wide input voltage range. This thesis develops the following techniques:(i) Design of the current-mode control SEPIC with the input voltage regulation.(ii) Maximum power point tracking (MPPT) controller design of the PV module.(iii) MPPT controller design of the WTG without sensing the rotor parameters,(iv) Design of the three-stage battery charging controller,(v) The PV module emulator and the WTG emulator implemented with the half-bridge converters.The MPPT controller for both subsystems, the Ⅰ-Ⅴ characteristic of the PV module emulator and the P-ω characteristic of the WTG emulator are implemented with the real-time control testing platform built by the MATLAB software. The other control circuits are realized with the analog circuits. Two80W charging systems for the PV module and the WTG respectively are designed and implemented. They are verified individually and then connected in parallel to form a hybrid charging system. The effectiveness of the proposed system is confirmed by simulation and experimental results.