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Dynamic Mathematical Model of Twelve-Pulse Diode Rectifier with Pole-to-Ground DC Fault |
Li Chun, Ma Fan, Fu Lijun, Shen Jianqing, Sun Wen |
National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan 430033 China |
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Abstract Twelve-pulse diode rectifiers with high-resistance grounding type have been widely used in various isolated power systems such as ship and aircraft. It is hard to model the dynamic behavior of pole-to-ground (P-to-G) DC fault of twelve-pulse diode rectifier because of many diode conduction combinations, complex and short transient process. In order to solve this problem, a dynamic mathematical modeling approach based on switch function and principle of harmonic balance is proposed. A large signal mathematical model of twelve-pulse diode rectifier with P-to-G DC fault is established, which is in the form of a set of non-linear state equations. The proposed modeling method is validated through comparison of mathematical model and physical experiment. The mathematical model is effective and can accurately reflect the transient behavior of P-to-G DC fault and the steady-state average characteristics before and after the P-to-G DC fault.
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Received: 12 April 2019
Published: 07 April 2020
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