Development of STATCOM to Improve Voltage Sag Due to Starting of 5 kilowatt Induction Motor

Voltage sags are the most frequent power quality problems for many industrial processes. Due to the wide usage of sensitive electronic equipment in many fields as, electronic controller, communication and computers, even voltage sags which last for only few tenths of a second may cause production stops with considerable associated costs; these costs include production losses, equipment restarting, damaged or lower-quality product and reduced customer satisfaction. An advanced static var compensator “STATCOM” is a reactive power source applied for the dynamic compensation in power systems to provide voltage support, increase transient stability margin and improve damping of power systems. This thesis investigates the possibility to develop a STATCOM that improve the voltage sag due to starting of 5-kilowatt induction motor. The setup of this implementation consists of inverter with a capacitor in its dc side, coupling transformers, and a control system. The self commutate thyristor inverter has been used in this implementation has a simple switching On/Off control operation. It operates at low frequencies (most often around ac line frequency), and in the conducting state. Thyristors feature have very low losses, making them attractive devices to efficiently control very high currents and energies. A capacitor in the dc side is charging via a diode bridge rectifier which is supplied from the same power source. The STATCOM compensator based line commutation voltage source inverter for correcting voltage sag in steady-state condition has been simulated using Matlab, and a good improvement on voltage sag has been obtained by injecting reactive power into the system during sag period. In order to verify the results obtained by the experiments. These results have been compared with simulation results and a good agreement has been obtained.

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