Study on Suppression of Voltage Fluctuation During Induction Motor Starting Using Volt-Var Control of Smart Inverter

초록

Induction motor starting often causes voltage fluctuations due to high inrush current, which can impact system stability and power quality. To address this, smart inverters with power control functions and superconducting fault current limiters (SFCLs) have emerged as promising solutions for reducing voltage instability. The power control of smart inverters ensures that the voltage at the point of common connection is maintained at a constant level, adapting to the system's conditions. In this paper, system voltage characteristics during induction motor starting were analyzed by applying smart inverter power control and SFCL, which aimed to suppress voltage fluctuation under high inrush current conditions. Experiments were conducted with smart inverters dynamically adjusting reactive power while SFCLs limit high inrush currents. The results show that smart inverters effectively suppress voltage drops during motor starting. Although SFCLs reduce inrush current, they can further decrease system voltage at the point of common coupling. This issue can be reduced through smart inverter control, improving voltage stability.

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