LI Huan,PENG Ke,ZHANG Xinhui,et al.Fault current suppression method for distribution network by controlling IIDG current phase[J].Electric Power Automation Equipment,2019,39(09):180-186.
LI Huan,PENG Ke,ZHANG Xinhui,et al.Fault current suppression method for distribution network by controlling IIDG current phase[J].Electric Power Automation Equipment,2019,39(09):180-186.DOI: 10.16081/j.epae.201909030.
Fault current suppression method for distribution network by controlling IIDG current phase
The distribution network in China is facing the challenge of high penetration of distributed gene-ration integrated. As a result,the topology and power flow direction of the distribution network have been changed,which easily causes misoperation or maloperation of the relay protection devices. The distributed generations are mostly connected to the distribution network by voltage sources inverters,so a fault current suppression method based on the inverter current phase control is proposed. The phase of the inverter output current is controlled in the
dq
reference frame,which makes the fault current amplitude of the relay protection device approximate to the short circuit current of the grid side. By this way,the influence of short circuit current supplied by IIDG(Inverter Interfaced Distributed Generation) on relay protection devi-ces is eliminated,therefore,the demands for the upgrade of the relay protection devices can be reduced. The correctness and effectiveness of the proposed control strategy is verified by the IEEE 13-bus system in DIgSILENT/PowerFactroy.
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