Research on Reverse Recovery Transient of Parallel Thyristors for Fusion Power Supply

ZHA Fengwei(查烽炜); SONG Zhiquan(宋执权); FU Peng(傅鹏); DONG Lin(董琳); WANG Min(王敏)

doi:10.1088/1009-0630/16/7/15

Plasma Science and Technology > 2014 > 16(7): 716-720. > DOI: 10.1088/1009-0630/16/7/15

ZHA Fengwei(查烽炜), SONG Zhiquan(宋执权), FU Peng(傅鹏), DONG Lin(董琳), WANG Min(王敏). Research on Reverse Recovery Transient of Parallel Thyristors for Fusion Power Supply[J]. Plasma Science and Technology, 2014, 16(7): 716-720. DOI: 10.1088/1009-0630/16/7/15

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Research on Reverse Recovery Transient of Parallel Thyristors for Fusion Power Supply

1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China 2 China International Nuclear Fusion Energy Program Execution Center, Beijing 100862, China

Funds: supported by the International Thermonuclear Experimental Reactor Project of China (No. 2008 GB104000)

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Received Date: July 07, 2013

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Abstract

Abstract

In nuclear fusion power supply systems, the thyristors often need to be connected in parallel for sustaining large current. However, research on the reverse recovery transient of parallel thyristors has not been reported yet. When several thyristors are connected in parallel, they cannot turn-off at the same moment, and thus the turn-off model based on a single thyristor is no longer suitable. In this paper, an analysis is presented for the reverse recovery transient of parallel thyristors. Parallel thyristors can be assumed as one virtual thyristor so that the reverse recovery current can be modeled by an exponential function. Through equivalent transforma- tion of the rectifier circuit, the commutating over-voltage can be calculated based on Kirchhoff’s equation. The reverse recovery current and commutation over-voltage waveforms are measured on an experiment platform for a high power rectifier supply. From the measurement results, it is concluded that the modeling method is acceptable.
- parallel thyristors,
- reverse recovery transient,
- commutating over-voltage,
- high power rectifier

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References (10)

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