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Energies 2017, 10(9), 1357; doi:10.3390/en10091357

Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Academic Editor: Tomonobu Senjyu
Received: 13 August 2017 / Revised: 4 September 2017 / Accepted: 5 September 2017 / Published: 8 September 2017
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Abstract

Electronic power transformers (EPTs) have been identified as emerging intelligent electronic devices in the future smart grid, e.g., the Energy Internet, especially in the application of renewable energy conversion and management. Considering that the EPT is directly connected to the medium-voltage grid, e.g., a10 kV distribution system, and its cascaded H-bridges structure, the common mode voltage (CMV) issue will be more complex and severe. The CMV will threaten the insulation of the entire EPT device and even produce common mode current. This paper investigates the generated mechanism and characteristics of the CMV in a cascaded H-bridge EPT (CHB-EPT) under both balanced and fault grid conditions. First, the CHB-EPT system is introduced. Then, a three-phase simplified circuit model of the high-voltage side of the EPT system is presented. Combined with a unipolar modulation strategy and carrier phase shifting technology by rigorous mathematical analysis and derivation, the EPT internal CMV and its characteristics are obtained. Moreover, the influence of the sinusoidal pulse width modulation dead time is considered and discussed based on analytical calculation. Finally, the simulation results are provided to verify the validity of the aforementioned model and the analysis results. The proposed theoretical analysis method is also suitable for other similar cascaded converters and can provide a useful theoretical guide for structural design and power density optimization. View Full-Text
Keywords: electronic power transformer; cascaded H-bridge; common mode voltage; carrier phase shift modulation; electrical insulation; dead time; fault condition electronic power transformer; cascaded H-bridge; common mode voltage; carrier phase shift modulation; electrical insulation; dead time; fault condition
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Yang, Y.; Mao, C.; Wang, D.; Tian, J.; Yang, M. Modeling and Analysis of the Common Mode Voltage in a Cascaded H-Bridge Electronic Power Transformer. Energies 2017, 10, 1357.

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