Power Quality Improvement in Transmission Line by using DPFC-ZSI Device

Abstract

Electrical power industry continuously seeks for the development of power management and control under dynamic load demand. The power grid has to be capable of to deliver active and reactive power to the loads as per changing load scenario. To control and manipulate the AC line parameters like active power, reactive power, frequency, power factor etc, flexible AC transmission system (FACTS) is broadly used. In this work, the impedance source inverter (ZSI) has been incorporated in the shunt converter of Distributed power flow controller (DPFC) to achieve a higher level of active and reactive power for the same power generation. The objective of the scheme is to enhance the capacity of DPFC by exterminating the flows of reactive as well as active power dependence on the voltage of the grid and hence establishing a more user-friendly power transmission that fulfills the wide range of load power requirements as well as satisfies economic feasibility. Therefore, in the proposed DPFC-ZSI model, the ZSI has been designed between the rectifier and DC to AC inverter of the shunt converter to enhance the power flow in the transmission line with an economic rate. Although, the introduction of ZSI in the traditional DPFC model has enhanced the capacity of power transmission by a significant level, but it will increase ripples in transmitted power which may cause a reduction in power quality.