APPARATUS AND METHOD FOR MONITORING THE OCCURRENCE OF GROUND FAULT IN SOLAR POWER GENERATION SYSTEM

摘要

In order to generate ground fault occurrence information for each photovoltaic string, the ground fault occurrence monitoring device of the photovoltaic power generation system of the present invention is connected to the output terminal of each of the at least one photovoltaic string, and the output voltage and leakage of the corresponding photovoltaic string Measuring the current, one side of the first resistor connected to the (+) output terminal of the solar string; a second resistor having one side connected to the other side of the first resistor and the other end connected to the (-) output terminal of the solar string; a first voltage detector for measuring a first voltage (V P ) across the first resistor; a second voltage detector for measuring a second voltage (V N ) across the second resistor; and a voltage and current measuring unit including a current detector for detecting a current (Ig) between a connection point of the first and second resistors and a ground; and a control unit for estimating whether a ground fault has occurred and the location of a ground fault in the corresponding solar string based on the output voltage and leakage current values, so as to quickly grasp the location of the ground fault in consideration of both voltage and current characteristics and at the same time It has the advantage of increasing the accuracy and precision of ground fault determination.