• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.23-24
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• 2010

본 논문에서 설계한 3kW급 절연형 DC/DC 컨버터는 전기 버스의 주 동력원인 고전압 배터리로부터 차량의 전장시스템에 저전압 전원을 공급한다. 이 전력변환에는 고전압 배터리측과 저전압 배터리측의 절연이 반드시 필요하기 때문에 고주파 변압기를 사용한 절연형 DC/DC 컨버터가 일반적으로 사용된다. 따라서 ZVS 동작이 가능한 위상천이 방식의 풀-브리지 컨버터를 선정하였다. 본 논문에서 사용된 전력변환장치는 차량시스템에 적용하기 적합한 프리스케일사의 32-Bit DSP인 MPC5553 기반의 제어기를 이용한 실험을 통해 타당성을 검증하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.16 no.2
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• pp.182-190
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• 2011

This paper proposes a LVRT (Low Voltage Ride Through) control strategy which should be satisfied by grid-connected wind power system when grid faults occur. The LVRT regulation indicates rules or actions which have to be executed according to the voltage dip ratio and the fault duration. Especially the wind power system has to support the grid with specified reactive current to secure the grid stability when voltage reduction ratio is over 10%. The LVRT regulation in this paper is based on the German Grid Code and full-scale variable speed wind power conversion system is considered for LVRT control strategy. The proposed LVRT control strategy satisfies not only LVRT regulation but also makes power balance between wind turbine and power system through additional DC link voltage regulation algorithms. Because it is impossible to control grid side power when the 3-phase to ground fault occurs, the DC link voltage is controlled by a generator side inverter using the DC link voltage control strategy. Through the simulation and experiment result, the proposed LVRT control strategy is evaluated and its effectiveness is verified.