Transformer Inrush Current Mitigation for Series Voltage Sag Compensator

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2017 by IJETT Journal
Volume-48 Number-4
Year of Publication : 2017
Authors : Anil Kumar Pathak, Dr. A. K. Jhala, Pramod Kumar Rathore
DOI :  10.14445/22315381/IJETT-V48P234


Anil Kumar Pathak, Dr. A. K. Jhala, Pramod Kumar Rathore "Transformer Inrush Current Mitigation for Series Voltage Sag Compensator", International Journal of Engineering Trends and Technology (IJETT), V48(4),187-192 June 2017. ISSN:2231-5381. published by seventh sense research group

Manufacturing industries are located in industrial park. Survey results suggest that 90% of interruption at industrial facilities is related voltage sag. An inrush mitigation technique is proposed and implemented in a synchronous reference frame sag compensator controller. The voltage sag compensator is based on three phase voltage source inverter and a coupling transformer for serial connection. In various companies voltage sag may affect many manufactures and may reduce the efficiency of the system which results sufficient losses in the power system. It is the most cost effective solution against voltage sags. When voltage sag happen, the transformers, which are often installed in front of critical loads for electrical isolation, are exposed to the disfigured voltages and a DC offset will occur in its flux linkage. A transformer inrush may occur at the start of sag compensator. This over current may damage the inrush protection of the series connected inverter and the transformer output voltage is greatly reduced due the magnetic saturation. When the compensator restores the load voltage, the flux linkage will be driven to the level of magnetic saturation and severe inrush current occurs. The compensator is likely to be interrupted because of its own over current protection. This paper proposes an inrush current mitigation technique together with a state-feedback controller for the Voltage sag compensator.


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SVPWM, Inrush current, Voltage sag compensator.