Fault Flexible Arc Suppression Approach Based on Cascaded H-Bridge Converters and dq Coordinate Transformation for Distribution Network
Guo Moufa1, Zhang Weijun2, Gao Wei1, Yang Gengjie1, Miao Xiren1
1. School of Electrical Engineering and Automation Fuzhou University Fuzhou 350116 China; 2. State Grid Fujian Electric Power Research Institute Fuzhou 350007 China
Abstract：To solve the problem of arc suppression under the single-phase grounding fault in distribution network, a novel approach based on cascaded H-bridge converters and dq reference frame transformation is proposed. A flexible grounding mode using three-phase cascaded H-bridge converter is firstly adopted in network. The current injected in non-fault phases can compensate the arc current at fault point and suppress the recovery voltage of fault phase. It could promote the rapid extinguishment of arc and make it restrike hardly. Then combined with the features of cascaded H-bridge converter, a new detecting method for harmonic and transient components of fault current based on dq reference frame transformation has been proposed. This method can realize the full current compensation in the cases of both stable and intermittent arc grounding faults. According to the mechanisms of current injected by cascaded H-bridge converter on fault current and fault phase recovery voltage, a unified arc suppression method about various arc grounding faults has been studied. Simulation results show the proposed approach is effective, which can improve arc extinguishment rate, promote the study and application of FACTS technique in grounding fault protection of smart power distribution network.
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2016, Vol. 31 
