In order to control the ±10 kV photovoltaic DC collection system fast and stably after the pole-to-pole short-circuit fault occurs

and avoid unnecessary downtime operation

a coordinated control strategy based on judging fault resistance is proposed. The influence of fault resistance on the pole-to-pole short-fault characteristics is analyzed

and the variation characteristics of fault electric quantity are extracted. By using the change characteristics of electric quantity before and after fault being cleared

a fault time analysis method is designed to judge whether the fault is temporary or not

and to generate a signal of cleared faults. Based on the principle of not triggering protection methods action

the fault recovery scheme is proposed to realize the normal operation of the system. A model of ±10 kV photovoltaic DC collection system with the coordinated control strategy is built and simulated based on the PSCAD/EMTDC. The results show that the proposed fault coordination control strategy can identify the temporary fault and recover the system after the fault is removed

and it improves the reliability of the system. The research results verify the correctness of the proposed fault coordination control strategy.