Utilization of Artificial Intelligence for Voltage and Reactive Power Control and Its Operational Results

The Nagano-region grid in Japan is a radial system transmitting large-scale power from major power plants over long distances. This configuration causes complex issues related to synchronous stability, frequency, and voltage under both normal and fault conditions. In recent years, the expansion of photovoltaic (PV) installations has intensified voltage fluctuations under normal conditions, requiring frequent voltage adjustments to maintain appropriate voltage levels. The conventional voltage and reactive power control (VQC) method adjusts generator terminal voltage based on predetermined voltage setpoints calculated for the most severe system conditions. Consequently, generator voltage control has been limited, and most adjustments have relied on reactive power compensation devices and…