Abstract
AbstractPower electronics technologies have been increasingly used by industries to improve productivity and energy efficiency. The high dynamics and high precision performances of these power electronics also require premium quality of electric power. Typical voltage sags caused by ground faults in the utility grid often interrupt the operation of these power electronics converters.A new voltage sag compensation system will be proposed in this thesis. The proposed system uses a voltage source inverter connected in series with the power line to inject compensation voltages when voltage sags occur. The controller of the proposed system uses the synchronous reference frame transformation to calculate the compensation voltage command. The inverter operates in the pulse width modulation (PWM) mode to produce the compensation voltage to protect the critical loads from the interference caused by voltage sags.This thesis will provide a survey of related literature, and discuss the control function of the proposed system in detail. Simulation results and experimental results will be provided to validate the performance of the proposed system.