Arc Suppression Method for Single-phase Grounding Device Faults in Power Grid Based on Improved PR Controller
In order to quickly trigger the arc suppression control action,quickly eliminate grounding faults,and reduce the duration of faults,a fault arc suppression method for single-phase grounding devices in the power grid is studied by improving the PR controller.This method mainly utilizes the arc suppression mode.In the single-phase grounding arc suppression device,a Pl+repetitive controller is designed as the inner loop control device,and the improved PR controller is the outer loop control device.In the current inner loop control,the PI+repetitive controller ensures that the current inner loop can quickly and accurately track the reference current,achieving precise injection compensation for fault current.In the outer loop control,the improved PR controller injects compensation current into the current inner loop and further controls the neutral point voltage,making the voltage value of the phase where the fault occurs in the distribution network zero,achieving reliable arc suppression control of single-phase grounding in the power grid.The experimental results show that this method has fast and accurate are suppression control capability.
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