Mitigation of Power Quality Problems Using DVR in Distribution Network for Welding Load

This paper describes the power quality problems like voltage sag, voltage swell and total harmonic distortion in the distribution network and its severe impact on non-linear load. DVR is one custom power device which can help in mitigating theses power quality problems. DVR becomes a very popular device as it can be used for both low and high voltage devices. In this paper, modeling and simulation of DVR for welding power load, its functions, configurations, components and various control strategies are presented. It first analyzes the power circuit of a DVR system in order to come up with appropriate control limitations and control targets for the compensation voltage control. The ZSI will provide ride through during voltage sag without any additional circuit and improve the power factor by reducing the harmonic current and common-mode voltage which will finally increase the reliability and extends the output voltage range. The proposed control scheme is simple to design.

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