Active voltage correction for industrial plants

Electric power supply voltage disturbances and, in particular, voltage sags, have been clearly identified as major problems to sophisticated continuous-process-based industries. Electricity network operators are often not able to provide the level of quality demanded by these industries at an economically viable cost using traditional distribution network reinforcement techniques. Considerable effort has been expended in the identification, quantification, and mitigation of voltage disturbances. Power electronic advancements have allowed the development of a new range of high-performance power conditioning equipment that can mitigate problems with the incoming power supply at the point of interface with the utility or within the plant internal electrical distribution system. This paper reviews the technologies available to perform high-speed voltage correction and discusses the results of practical application.