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Voltage sags is a common power system disturbance, usually associated with power system faults. Therefore the effective detection of voltage sag event is an important issue for voltage sag analysis and mitigation. There are several detection methods for voltage sags such as RMS voltage detection, peak voltage detection, and Fourier transform methods. The problem with these methods is that they use...
This paper presents the modeling and simulation of a dynamic voltage restorer as a voltage sag/swell mitigation device in electrical power distribution networks. The dynamic voltage restorer, with its excellent dynamic capabilities, when installed between the supply and a critical load feeder, can compensate for voltage sags/swell, restoring line voltage to its nominal value within few milliseconds...
This paper presents the design of Load side compensation topology of Dynamic Voltage Restorer using Z-source Inverter which is able to compensate voltage sag and swell at sensitive load terminals. Based on this topology, the DVR consists of uncontrolled rectifier for giving DC supply to Z-Source converter through DC link. Z- Source Converter based topology is proposed in order to enhance the voltage...
This paper presents the systematic procedure of the modeling and simulation of a Distribution STATCOM (D-STATCOM) for power quality problems, voltage sag and swell based on Sinusoidal Pulse Width Modulation (SPWM) technique. Power quality is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure of end use equipments. The major problems dealt here is the...
This paper presents the systematic procedure of the modeling and simulation of a Dynamic Voltage Restorer (DVR) for power quality problems, voltage sag and swell based on Sinusoidal Pulse Width Modulation (SPWM) technique. Power quality is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure of end use equipments. The major problems dealt here is the voltage...
The dc link voltage of the unified power quality conditioner (UPQC) is maintained at certain preset value during the steady state. However the dc link voltage can significantly deviate from its reference during a transient event, caused by load connection/disconnection or/and supply side voltage sag/swell. During such transients, due to significant deviation in the dc link voltage, the series injected...
This paper provides an efficient way to eliminate the interharmonics appearing in the adjustable speed drives. The conventional diode bridge rectifier is replaced by controlled rectifier to have better control over the interharmonics's adverse effects in the drive. The proposed method also eliminates the use of supply side impedance to reduce the interharmonics in the system. Thereby, it increases...
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