태양광 발전설비의 안정성 확보를 위한 접지설계에 관한 연구

Abstract

Recently, environmentally friendly and renewable energy development is becoming increasingly important. Many people have a lot of interest in the field of power supply and demand. Nuclear power generation capable of large capacity development has difficulties in safety accidents and waste disposal. In addition, thermal power plants have difficulties in constructing power plants due to problems such as global warming caused by the emission of environmentally harmful substances and the limitation of fuel. Therefore, interest and demand of solar power generation facilities are rapidly increasing. With sunlight, there is no need for fuel cost, no air pollution, no waste, no mechanical vibration and noise, because the infinite, zero pollution energy can be used continuously. Recently, photovoltaic power generation facilities are being converted from a small scale to a large-scale grid for home use and are increasing at a high rate. Most photovoltaic power generation facilities are installed and operated in a grid-connected manner. However, in order to enlarge the PV module, system safety must be ensured and the ground electrode should be made larger in order to prevent accidents. In order to stabilize the grounding resistance in the mountainous area, which is the main installation area of ​​the photovoltaic power generation facilities, various types of large grounding electrodes such as boring method, mesh method and rod type are being constructed. Measuring the grounding resistance of a large-scale photovoltaic (PV) system follows a realistic difficulty in applying existing measurement techniques. In addition, there are very few standards for electric shock protection and electrical safety of DC systems such as solar power generation facilities. At present, US Electricity Corporation and Canadian Electrical Corporation regulations provide details of circuit conditions, overcurrent protection, and electric shock protection in PV facilities. Therefore, it is necessary to review and compare the international standards and the PV standards related to the US and Canada to secure the electric safety of the photovoltaic power generation system. In this paper, we evaluate the grounding resistance of solar power generation facilities, propose standardized measurement techniques, examine the principle of grounding measurement and measurement techniques applied domestically and internationally. In order to verify the improvement effect after construction, we tried to verify the validity of the measurement technique by comparing the noise measurement results before and after the re-measurement of the ground noise signal during the operation of the facility.