Performance Analysis of 48-Pulse VSC-Based STATCOM in Mitigation of Voltage Dip Caused by The Starting of A High Power Induction-Motor

––This paper describes the performance of a Flexible Alternating Current Transmission Systems (FACTS) device, namely, STATic synchronous COMpensator (STATCOM) based on 48-pulse Voltage Source Converter (VSC), for the mitigation of voltage-dip caused by the starting of a high power induction motor. It improves the voltage profile feeding to a high power induction motor at starting by injecting a controllable current to the supply line having an acceptable limit of harmonics as per the standards of IEEE. Its capability to compensate reactive power to the system when the voltage dip occurs due to starting of high power induction motor load is described. The 48-pulse VSC employed in the STATCOM injects an almost sinusoidal current of variable magnitude, in quadrature with the line voltage, thereby emulating an inductive or a capacitive reactance at the point of connection with the line. Investigator has developed a 48-pulse VSCbased STATCOM and implemented it into a power-system consists a high power induction motor in MATLAB Simulink environment. The results show that the fast response and the STATCOM capability to inject reactive power during voltage dip within the acceptable limit of harmonics make it an acceptable device.