Technical University Malaysia Malacca

Kampung Ayer Keroh, Malaysia

Technical University Malaysia Malacca

Kampung Ayer Keroh, Malaysia
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Omar R.,Technical University Malaysia Malacca | Sulaiman M.,Technical University Malaysia Malacca | Rahim N.A.,University of Malaya
Iranian Journal of Electrical and Computer Engineering | Year: 2010

This paper presents the low voltage Dynamic Voltage Restorer (DVR) based on application of Space Vector Pulse Width Modulation (SVPWM) for three phases Voltage Source Converter (VSC) and it is the standard PWM techniques to utilize the DC-AC power conversion. A control technique based on SVPWM is also proposed for dynamic voltage restorer. The DVR was a power electronics device that was able to compensate voltage sags on critical loads dynamically. By injecting an appropriate voltage, the DVR restores a voltage waveform and ensures constant load voltage. The compensating signals are determined dynamically based on the difference between desired and measured values. The DVR consists of VSC, injection transformers, passive filters and energy storage (lead acid battery). The efficiency of the DVR depends on the efficiency of the control technique involved in switching of the inverter. In this paper a novel structure for voltage sags mitigation and for power quality improvement are proposed. There was an increasing trend of using Space Vector PWM (SVPWM) because of their easier digital realization and better dc bus utilization. The proposed control algorithm is investigated through computer simulation by using PSCAD/EMTDC software and hardware implementation using DSP TMS320F2812. The results of the simulation and experimental show the performance of the proposed low voltage dynamic voltage restorer and prove the validity of the proposed topology. It was concluded that the proposed low voltage dynamic voltage restorer works well both in balance and unbalance conditions of voltages. © 2010.


Omar R.,Technical University Malaysia Malacca | Rahim N.A,Technical University Malaysia Malacca
Journal of Electrical Systems | Year: 2010

This paper proposes a mitigation of different types of voltage sags in low voltage distribution system using an effective series compensator or Dynamic Voltage Restorer (DVR) with new configuration of its topology. The main function of the DVR is to maintain the voltage at the sensitive load from balance and unbalance voltage sags. The developed system can compensate voltage sags in the grid and at the end can be used for the protection of sensitive loads in the network. DVR under various load conditions and different types of fault in both single phase and three phases were investigated. A prototype of the proposed scheme was built and tested in order to test its feasibility through extensive experimental studies. © JES 2010.

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