The present invention relates to a power conversion system for an electric vehicle. The power conversion system for an electric vehicle according to an embodiment of the present invention comprises: an inverter which has a plurality of paired switching elements, and converts direct current voltage into alternating current voltage by switching each pair of switching elements; an electric motor which includes a plurality of stator windings and a rotor, wherein the rotor is rotated by alternating current voltage output to the plurality of stator windings from the inverter; an output capacitor which is electrically connected to an electric field load, and is serially connected to any one of the plurality of stator windings; a position detection unit which detects the position of the rotor; and a control unit which converts direct current power into direct current voltage with a voltage level lower than the voltage of the direct power by using the stator windings of the motor, the switching element of the inverter, and an output capacitor when the motor is in the stop state, performs power conversion between DC powers provided to an electric field load, determines the inductance of the stator windings in accordance with the position of the rotor detected through the position detection unit while performing the power conversion between DC powers, and varies a switching cycle of the switching element of the inverter in accordance with the determined inductance.
전기자동차의 전력변환시스템이 개시된다. 본 발명의 일실시예에 따른 전기자동차의 전력변환시스템은 한 쌍을 이루는 복수의 스위칭소자를 가지고, 각 쌍의 스위칭소자를 스위칭하는 것에 의해 직류전압을 교류전압으로 변환하는 인버터와, 복수의 고정자권선과 회전자를 포함하고, 인버터로부터 복수의 고정자권선에 출력된 교류전압에 의해 회전자가 회전하는 전동기와, 전장부하와 전기적으로 연결되고, 복수의 고정자권선 중 어느 하나와 직렬 연결된 출력 커패시터와, 회전자의 위치를 감지하는 위치감지부 및 전동기가 정지상태일 때 전동기의 고정자권선, 인버터의 스위칭소자 및 출력 커패시터를 이용하여 직류전원을 직류전원의 전압보다 낮은 전압레벨의 직류전압으로 변환하여 전장부하에 제공하는 DC 전원간의 전력 변환을 수행하되, DC 전원간의 전력 변환을 수행하는 동안 위치감지부를 통해 감지된 회전자 위치에 따라 고정자권선의 인덕턴스를 판단하고, 판단된 인덕턴스에 따라 인버터의 스위칭소자의 스위칭주기를 가변시키는 제어부를 포함한다.
POWER CONVERSION SYSTEM FOR ELECTRIC VEHICLES AND CONTROL METHOF THEREOF
전기자동차의 전력변환시스템 및 전력변환방법
2016-12-07
Patent
Electronic Resource
Korean
IPC: | H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern |
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