| Summary: | 碩士 === 國立清華大學 === 電機工程學系所 === 106 === This thesis develops a battery/super-capacitor (SC) hybrid source powered electric vehicle (EV) switched-reluctance motor (SRM) drive with grid-to-vehicle (G2V), vehicle-to-home (V2H) and vehicle-to-grid (V2G) functions. Through proper schematic arrangement and control, these auxiliary functions are implemented using the SRM drive embedded components. The galvanic isolation in grid-connected operations is achieved by a resonant DC/DC converter.
The battery and the SC are connected to the motor drive DC-link via an H-bridge DC/DC converter and a one-leg bidirectional converter, respectively. The former lets the motor drive possess higher flexibility in DC-link voltage setting, which can even be lower than the battery voltage to improve the EV driving performance over wide speed range. Through the proposed filter-based current separation approach and maximum discharging current setting, the battery current stress can be mitigated to have smoother discharging current characteristics. And the SC can effectively deal with the fast and peak power fluctuation. The SC also helps the battery to regulate its current tracking error. In addition, the SC is arranged to be charged by the battery during the constant driving speed duration. Therefore, more sufficient energy of SC to help the battery in acceleration can be ensured.
In EV motor driving control, to enhance the winding current tracking responses, the properly designed feedback controller is augmented with an observed back electromotive force (EMF) based feed-forward controller and a robust current tracking error cancellation controller (RCECC). Moreover, the commutation shifting and the voltage boosting are applied to reduce the effects of back-EMF under higher speeds and/or heavier loads.
In idle condition, the original SRM drive schematic is rearranged to form a single- phase three-wire (1P3W) switched-mode rectifier (SMR) to conduct the G2V on-board battery charging. Conversely in V2H/V2G operations, a 1P3W inverter is constructed. The single-phase 60Hz 110V/220V AC voltages are yielded to power the home appliance or send back power to the utility grid. During the G2V/V2G grid-connected operations, the load reactive and harmonic powers can be compensated by the battery. In addition, a three-phase SMR and a three-phase inverter are further established to perform the G2V/V2G operations between the developed EV drive and the three-phase utility grid. The three-phase utility grid can achieve the quick on-board charging with good line drawn power quality.
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