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| Cascaded LC-AC Transformer Unidirectional DC-DC Converter with High Stepping Ratio |
| Li Mengbo1, Xie Zhujun1, Lin Weixing1,2, Wen Jinyu1, Wang Shaorong1 |
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
2. TBEA Sunoasis Co., Ltd Urumchi 830011 China |
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Abstract This paper proposes a cascaded LC-AC transformer unidirectional DC-DC converter (LCT DC-DC), which has high stepping ratio and is suitable for integrating renewable energy sources to DC grid. The presented LCT DC-DC converter can achieve about 40 times stepping ratio through the two-stage step-up of voltage. To begin with, the voltage source converters (VSC) are used to invert DC to AC, an adequately designed inductor-capacitor circuit is then employed to achieve voltage step up in the first stage. In the second stage, an AC transformer will further boost the output voltage. Diode rectifiers are finally used to rectify AC to DC. This paper firstly introduces the design procedures of the LCT DC-DC. The corresponding active power control strategy and the power loss estimations are studied as well. The simulations on PSCAD/EMTDC confirm the technical feasibility of the proposed topology.
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Received: 18 October 2016
Published: 31 January 2018
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| Fund:国家自然科学基金（51377067）和中国博士后科学基金（2016T90690）资助项目 |
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2018, Vol. 33 
