Compensation Of Power Quality Problems Through Dynamic Voltage Restorer Using New Optimizing Technique

As the world is moving towards modernization, the most essential need that it has is of an efficient and reliable power of excellent quality. Nowadays, more and more sophisticated devices are being introduced, and their sensitivity is dependent upon the quality of input power, even a slight disturbance in power quality, such as Voltage sags, voltage swells, and harmonics, which lasts in tens of milliseconds, can result in a huge loss because of the failure of end use equipments.For catering the problem related to power quality, Custom Power Supplies (CUPS) are being used in power distribution network, out of which the most effective and efficient device is Dynamic Voltage Restorer (DVR). As the name suggests Dynamic Voltage Restorer is a power electronics device with the aim of compensating voltage disturbances and harmonic, and provide a constant power at load side, moreover its pros include low cost, small size, and fast response to disturbances. This thesis focuses on optimizing the function of DVR of compensating voltage sags and swells as well as phase jumps and voltage harmonics by applying new optimization technique in the control circuitry of DVR, which is basically a combination of discrete PWM-based control scheme, DQO transformation, and PI Controller. The combination of these techniques results in minimum DVR’s power rating accompanying with more accurate compensation of sags and swells, as well as compensation of phase angle jumps. Design and analysis is done on MATLAB/SIMULINK environment.