Effect of Network Parameters on the Injection Current Requirement of D-STATCOM Designed to Mitigate Voltage Sag

The Distribution Static Compensator (D-STATCOM) can be used as a parallel voltage sag mitigation device at distribution systems. The D-STATCOM is also able to regulate and balance the bus voltage by absorbing or generating the required reactive power at specific buses. This study presents an overview on D-STATCOM structure and its simplified model that can be used for voltage sag analysis. In addition, this study also investigates the effect of various load and network parameters on the nominal power requirement D-STATCOM and its ability to compensate voltage sag. The results illustrate the performance of D-STATCOM by using an injection current to various conditions for voltage sag mitigation. In addition, the result shows that the D-STATCOM is not economical and effective in high voltage networks with low inductance feeder.