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In electric vehicle (EV) drive systems, sizing and selection of DC link capacitors involve tradeoffs among system performance including lifetime, reliability, cost, and power density. This paper contributes a comprehensive and comparative study on the DC-link capacitor applications and evaluations to meet the above requirements. The research starts with dynamic modeling of the capacitor equivalent...
In electric vehicle (EV) inverter systems, direct-current-link capacitors, which are bulky, heavy, and susceptible to degradation from self heating, can become a critical obstacle to high power density. This paper presents a comprehensive method for the analysis and comparative evaluation of dc-link capacitor applications to minimize the volume, mass, and capacitance. Models of equivalent series resistance...
In order to improve the drive system efficiency, a boost/buck bi-directional DC-DC converter which can regulate the DC-link voltage according to optimal efficiency curve is added between the battery and the traditional voltage source inverters (VSI) supplying a motor. The traditional control approach for the bi-directional DC-DC converter is based on the analog control concept. However, it is not...
When a boost/buck DC-DC converter is added to the traditional voltage source inverters (VSI) drive system of electric vehicles (EV), the drive system is transformed into an electronic cascaded system. A new load current forward feed control strategy for the DC/DC converter is presented in order to improve the DC-link voltage stability. The small-signal model of the DC/DC converter with the proposed...
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