A novel method of insulation parameters measurement based on hybrid flexible arc suppression device in distribution networks

Abstract

As one kind of active arc suppression devices, the hybrid flexible arc suppression device (HFASD) with current-based arc suppression method can eliminate the ground-fault current during the single-line-to-ground (SLG) fault. One of the most important aspects for current-based arc suppression method is the insulation parameters measurement. The reference current of current-based arc suppression method is calculated by the insulation parameters, including the ground capacitance and ground leakage conductance. For the sake of obtaining high-precision reference current of current-based arc suppression method, the insulation parameters should be measured accurately. However, the most of existing methods of insulation parameters measurement should increase the additional device cost and measure inaccurately. In this paper, HFASD based on second-order generalized integrator phase-locked loop (SOGI-PLL) algorithm and twice injection current method is proposed to measure the insulation parameters under the normal condition of distribution networks. The simulation and experimental results verify the effectiveness of the proposed method under different influence factors.