New Microgrid Fault Analysis Method Based on Inverter-Type DG Characteristic

doi:10.11930/j.issn.1004-9649.201707136

Abstract

Abstract: Inverter-type distributed generation output is different from traditional generation during system fault. This results in challenges on fault characteristic analysis and protection schemes of microgrid. The output of inverter-type DG depends on not only microgrid conditions but also control modes. Firstly, new equivalent fault analysis model of microgrid is developed with consideration of PQ control and V/F control constraints. Secondly, Based on equivalent model, DG fault voltage and current under both symmetrical and asymmetrical conditions are determined. Finally, the well-developed power grid simulation software DIgSILENT is used to build microgrid simulation model of inverter-type DG with both PQ control and V/F control functions. The simulation results are compared with results calculated by traditional fault analysis. The comparison results verify the effectiveness and accuracy of proposed fault analysis method.

Key words: microgrid, fault analysis, PQ control, V/F control, inverter-type DG

CLC Number:

TM715

JI Liang, ZHANG Haitao, REN Jianming, YANG Xingwu, TAO Xiaojie. New Microgrid Fault Analysis Method Based on Inverter-Type DG Characteristic[J]. Electric Power, 2017, 50(12): 165-172.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201707136

https://www.electricpower.com.cn/EN/Y2017/V50/I12/165

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