| Summary: | 碩士 === 國立臺北科技大學 === 電力電子產業研發碩士專班 === 100 === The objective of this paper focuses on design and implementation of a secondary battery test system with high dynamic response. This system provides not only the high power battery for charging and discharging test, but also the bi-directional current control for a secondary battery to simulate the power flow of driving state for developing control strategy of EV and HEV. Thus, the cost and time of driving test with battery can be reduced. In addition, the discharging energy of the battery can be sent back to grid to fulfill energy saving. The proposed system is composed of two bi-directional power flow converters in serial connection, which are a three-phase AC-DC converter with power factor correction and a galvanic isolation DC-DC converter. The DC-DC convert is constructed by two sets of full-bridge circuit, a high frequency transformer module inserted between these two bridges to make isolation and a LC filter at the output terminal of battery. In the charge mode, the battery will be charged by the utility through a phase-shifted full-bridge circuit with ZVS control strategy, a high frequency transformer module, a full-bridge circuit with synchronous rectification and a LC filter. In the discharge mode, a current-fed full-bridge control is used to recover the discharging energy to utility through transformer module and the DC-AC inverter.
In order to facilitate the response of the current control, the small signal analysis will be derived to design a proper control strategy. Finally, a DSP-based converter with water cooling is established to provide 6kW/250V for the battery test system. Besides, some measured results are provided to show its successful operation and effectiveness.
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