Bücher von Miska Prasad

This book deals with most commonly occurred voltage disturbances namely voltage sags and voltage swells and in order to mitigate these frequently occurred serious power quality problems emerging Custom Power Device (CPDs) such as Impedance source Inverter Dynamic Voltage Restorer (DVR), Distributed Static Synchronous Compensator (DSTATCOM) and Unified Power Quality Conditioner (UPQC) are considered. Voltage sag and swell magnitude, phase-angle jump and duration are considered as the most important characteristics of voltage sag and swell. The presentation of voltage sag and swell characterization is an important because power quality, troubleshooting, diagnosis and mitigation policy could be carried out only after characterizing the voltage sags and swells. This book describes the 33/0.4 kV power system to show the various characteristics of voltage sags and swells. This book presents a broad voltage sag and swell characterization (VSC) in terms of magnitude, phase-angle jump and duration under system fault (symmetrical and asymmetrical), starting of induction motor, sudden switching a linear and nonlinear load using MATLAB/SIMULINK environment.

Power quality is actually the quality of the voltage that is being addressed in most cases. Power quality disturbances such as voltage sag, voltage swell have been identified as the major sources of power quality problems. This book involves in-depth analysis of power quality improvement device called as Distribution Static Synchronous Compensator (DSTATCOM) to alleviate voltage sags and swells. In this book, a Synchronous Reference Frame (SRF) theory, Instantaneous Active and Reactive Current (IARC) theory, and Proportional-Integral (PI) controller are used to generates a reference signals and control the operation of DSTATCOM, aimed at power quality improvement. The performance of these control techniques has been analyzed using time-domain MATLAB/Simulink software under three-phase linear and nonlinear load conditions. The obtained MATLAB simulation results from SRF, IARC and PI control schemes are excellent or even slightly better in IARC control in compared with SRF and PI control.