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| An Extended Describing Modeling Method for the Multi-Resonant Converter with High Order Harmonic Components |
| Han Fuqiang1, Wang Yifeng1, Li Zhanchun2, Ji Ruilin3, Liu Ruixin1 |
1. Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China;
2. State Grid Tianjin Electric Power Corporation Chengxi District Supply Company Tianjin 300113 China;
3. State Grid Tianjin Power Costumer Service Center Tianjin 300210 China |
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Abstract An extended describing modeling method for multi-resonant converters with high order harmonics is proposed in this paper. Through the appropriate parameter design, the five-element LCLCL converter is able to transfer the fundamental and the third-order harmonic active power simultaneously. It results in the promoted utilization rate of the resonant current. The modeling principle and shortcomings of the traditional fundamental harmonic approximation method are analyzed in detail. By employing an equivalent impedance to substitute the non-linear output cell of the converter, the proposed extended describing method is built. Besides, the continuous and discontinuous rectifier current operating conditions are considered, and the expression of DC voltage gain is obtained. Finally, a 500W prototype is built in the laboratory. The feasibility of the proposed method is verified by theoretical calculations, simulations and experimental results. Outstanding soft-switching characteristics are achieved in the whole load range. The highest efficiency is 95.46%, and relatively high conversion efficiency is guaranteed under light load as well.
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Received: 10 September 2018
Published: 30 December 2019
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2019, Vol. 34 
