A power quality Improvement of Mitigating Neutral current for VSC Based DSTATCOM Using TIES

Three-Phase four-wire distribution systems are facing severe power quality problems such as poor voltage regulation, high reactive power and harmonics current burden, load unbalancing, excessive neutral current, etc.This creates excessive neutral current both of fundamental and harmonic frequency and the neutral conductor gets overloaded. By integrating phase shifting into an extremely low zero phase sequence impedance transformer with single or multiple outputs, substantial reduction of triplen, 5th and 7th harmonics can be achieved. In this Paper the different TIES (Transformer connection) mitigate the neutral current and the VSC compensates Harmonic current, reactive power, and balances the load. TIES configuration for interfacing to a three-phase fourwire power distribution system and the required rating of the VSC is reduced. The insulated gate bipolar transistor (IGBT) based VSC is supported by a capacitor and is controlled for the required compensation of the load current. The DSTATCOM is validated using MATLAB software with its simulink and power system block set toolboxes.