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• Mao, C
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Energies 2013, 6(8), 4246-4268; doi:10.3390/en6084246

Article

Analysis and Simulation of Fault Characteristics of Power Switch Failures in Distribution Electronic Power Transformers

Zixia Sang ¹, Chengxiong Mao ¹, Jiming Lu ² and Dan Wang ^2,*

¹ State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China ² School of Electrical & Electronic Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China

* Author to whom correspondence should be addressed.

Received: 5 June 2013; in revised form: 17 July 2013 / Accepted: 9 August 2013 / Published: 19 August 2013

(This article belongs to the Special Issue Smart Grids: The Electrical Power Network and Communication System)

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Abstract: This paper presents research on the voltage and current distortion in the input stage, isolation stage and output stage of Distribution Electronic Power transformer (D-EPT) after the open-circuit and short-circuit faults of its power switches. In this paper, the operational principles and the control methods for input stage, isolation stage and output stage of D-EPT, which work as a cascaded H-bridge rectifier, DC-DC converter and inverter, respectively, are introduced. Based on conclusions derived from the performance analysis of D-EPT after the faults, this paper comes up with the effects from its topology design and control scheme on the current and voltage distortion. According to the EPT fault characteristics, since the waveforms of relevant components heavily depend on the location of the faulty switch, it is very easy to locate the exact position of the faulty switch. Finally, the fault characteristics peculiar to D-EPT are analyzed, and further discussed with simulation on the Saber platform, as well as a fault location diagnosis algorithm.

Keywords: electronic power transformer (EPT); open-circuit fault; short-circuit fault; cascaded H-bridge rectifier; DC-DC converter; inverter; fault characteristics

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