Analysis of Active Power Losses in the Korean Power System Considering Weather-Dependent Line Resistances; 기상 조건에 따른 선로 저항 변동을 고려한 국내 전력 계통의 유효 전력 손실 분석

초록

In conventional analysis methods for power systems, a static transmission line model has traditionally been used, assuming that the conductor temperature remains constant. However, due to factors such as the amount of current flowing through the conductor and external influences, including weather conditions, the heat energy entering and leaving the conductor fluctuates, leading to changes in transmission line resistance. This paper aims to analyze the impact of weather conditions on conductor temperature and, consequently, the alteration of active power losses within a large power system. The analysis utilizes the heat balance equation to calculate conductor temperature, taking into account diverse weather parameters like ambient temperature, wind speed, wind direction, and solar irradiance. The temperature-dependent resistance is then integrated into the power flow analysis. Subsequently, the active power losses in a power system are determined, considering the influence of weather conditions, and these results are compared with those obtained from conventional power flow analysis. To conduct these calculations with a practical power system, we employ a Korean power system model and consider a range of potential weather conditions specific to Korea. This enables us to calculate conductor temperatures, line resistances for each transmission line, and the corresponding variations in active power losses under different weather conditions © The Korean Institute of Electrical Engineers.

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