D-STATCOM for Voltage Sag and Swell Mitigation

The D-STATCOM (Distribution Static Synchronous Compensator) is a power electronic device connected to electrical power systems to address voltage sag and swell issues - critical power quality problems. By controlling the injection of compensating current into the grid, the D-STATCOM can supply reactive power and significantly enhance power quality. This device is widely implemented in power supply industries including power plants and substations. The D-STATCOM employs advanced control algorithms, typically implemented through digital signal processors (DSPs) or field-programmable gate arrays (FPGAs), which constantly monitor grid voltage parameters and calculate required compensation currents using instantaneous power theory or phase-locked loop (PLL) techniques. For industrial and commercial facilities connected to power systems, the D-STATCOM represents a crucial solution for maintaining stable voltage levels and protecting sensitive equipment from power quality disturbances. The control system typically employs proportional-integral (PI) controllers to regulate the DC-link voltage and generate precise pulse-width modulation (PWM) signals for the voltage source converter (VSC) operation.