A BATTERY/SUPERCAPACITOR POWERED EV SRM DRIVE WITH G2V/V2G FUNCTIONS

• Main Authors: He, Jr Jia, 何致嘉
• Other Authors: Liaw, Chang Ming
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/92048869768552407338

碩士 === 國立清華大學 === 電機工程學系 === 103 === This thesis is mainly concerned with the development of a battery/supercapacitor powered electric vehicle (EV) three-phase switched-reluctance motor (SRM) drive having grid-to-vehicle (G2V), vehicle-to-home (V2H), and vehicle-to-grid (V2G) operation capabilities. All these operations are achieved with integrated schematics formed using the SRM drive embedded components. In the developed asymmetric bridge converter fed SRM drive, its DC-link voltage is established from the battery via an interleaved boost DC/DC converter. While the super- capacitor (SC) is interfaced to the DC-link by an one-leg bidirectional buck/boost DC/DC converter. And the SC is linked to the battery through a diode. This arrangement allows the SC effectively absorbing the regenerative braking energy and automatically charging the battery as the SC voltage is increased to a certain value. Conversely, the SC can quickly discharge to assist the motor acceleration. Then the battery follows to support the motor driving operation. In SRM drive control improvement, the winding current response is enhanced by the proposed control scheme. Wherein, the feedback controller is augmented with an observed back electromotive force (EMF) feed-forward controller and a simple robust current tracking error cancellation controller (RCECC). Moreover, a dynamic commutation tuning (DCT) scheme is added to reduce the back-EMF effects under higher speeds. As to the speed control loop, it is also properly designed to yield satisfactory driving performances, including acceleration/deceleration, reversible and regenerative braking operations. The operating characteristics and the advantages of using SC are also evaluated experimentally. In EV idle condition, its battery can be charged from the grid (G2V) with power factor correction (PFC). Several types of on-board PFC switch-mode rectifiers (SMRs) are formed. The integrated circuits of these SMRs include a single-phase H-bridge boost (SMR), a single-phase bridgeless boost SMR and a three-phase bridgeless discontinue current mode (DCM) SMR. All these SMRs are followed by a DC/DC buck converter based battery charger to yield good charging performance. In autonomous V2H operation, a single-phase three-wire (1P3W) inverter with boosted DC-link voltage (550V) from the battery (156V) via a DC/DC boost converter is formed to generate the 110V/220V 60Hz AC voltage outputs for powering domestic appliances. Good output voltage waveforms are generated under unknown and non-linear loads via applying differential mode (DM) and common mode (CM) controls. As to the grid-connected V2G operation, the inverter can power the domestic appliances, and the surplus energy can be sent back to the grid.