09-02-2017, 12:13 PM
The proliferation of electronic power based equipment has produced a significant impact on the quality of electrical power supply. The modern day equipment's are highly sensitive to deviation from ideal sinusoidal voltages. Conventional power quality enhancement equipment's are providing to be in adequate. A very promising solution for supply voltage imperfection is UPQC (Unified Power Quality Conditioner). Unified power quality conditioners (UPQCs) allow the mitigation of voltage and current disturbances that could affect sensitive electrical loads while compensating the load reactive power. In this Paper we deal with implementation of left shunt configuration UPQC for voltage sag mitigation. The solution is provided using MATLAB 7.5. Power quality is one of the major concerns in the present era. It has become important especially, with the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supply. Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that results in failure or mis-operation of end user equipment's. One of the major problems dealt with here is the voltage sag. To solve this problem, custom power devices such as Distribution Static Compensator (D-STATCOM), Dynamic Voltage Restorer (DVR), and Unified Power Quality Conditioner (UPQC) are used. In this paper, DVR, which is the most efficient and effective modern power device used in power distribution networks, is employed because of its lower cost, smaller size, and fast dynamic response to the disturbance. This paper presents the simulation analysis of a DVR in MATLAB / SIMULINK environment and its hardware implementation for voltage sag compensation. DVR, D-STATCOM, MATLAB / SIMULINK, Power Quality, UPQC, Voltage sag compensation. The results showed clearly the performance of the DVR in mitigating voltage sags.