The DVR-AC, a novel structure for mitigating large voltage sags and swells using voltage re-injection

• Published in: 2011 North American Power Symposium pp. 1 - 6
• Main Authors: Santoyo Anaya, M. A., Moreno Goytia, E. L., Rodriguez, J. R.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.08.2011
• Subjects: Equations; Mathematical model; Matrix converters; Power quality; Topology; Voltage control; Voltage fluctuations
• DOI: 10.1109/NAPS.2011.6025104
• ISBN: 9781457704178; 145770417X

Voltage sags, swells and harmonic distortion are three of the more representative PQ events in distribution grids. For mitigating such events various AC-AC- and AC-link structures has been proposed over the years with greater or lesser success for ameliorating large voltage deviation events. This paper introduces the DVR-AC (Dynamic Voltage Restorer Alternate Current), a novel power electronics-based structures alternative option for mitigating short and long standing voltage swell and sags with large magnitude deviations from nominal. The solution is based upon an AC input 2×2 matrix converter whose output voltage is injected to the grid through a series transformer. The magnitude control of the injected voltage, based on PWM, is clearly explained. The cases of study results evidence the advantages of the DVR-AC respective to other techniques and topologies.