Abstract: In consideration of the problem that fault current is difficult to fully compensate and the arc suppression effect is poor after single-phase grounding faults occur in the distribution network with neutral point grounded by the Petersen coil, an active arc-suppression method based on double-end measurement of ground parameters and closed-loop control is proposed, in which fault arc suppression can be realized by injecting a power frequency current into the neutral point of the distribution network. In the double-end measurement method of ground parameters proposed in the paper, the injection transformer of the flexible grounding device is used as the injection end to inject a specific frequency current, and the internal voltage transformer of the Petersen coil is used as the return end to measure the no-load voltage, so as to realize the ground parameter measurement of the distribution network. In this proposed method, the damping resistance of the Petersen coil is considered, and the influence of the leakage impedance of the injection transformer on the measurement accuracy is eliminated, thereby eliminating the errors in the modeling and principle of the traditional ground parameter measurement method. Furthermore, a current closed-loop control method is designed: after the reference value of the injected current is calculated from the measured ground parameters of the distribution network, the proportional resonance (PR) controller is used to correct the difference between the actual value and the reference value of the injected current, and then it is injected into the neutral point of the distribution network by the L-shaped filter circuit, thus the fault phase voltage is effectively suppressed to zero. The simulation and experiment results show that the proposed method has high accuracy and fast response speed, can achieve fast and reliable arc suppression of ground faults, and is suitable for faults with different transition resistances.