Field experience with Dynamic Voltage Restorer (DVRTMMV) systems

Economic pressures on industry to automate processes and improve efficiencies have resulted in a steady increase in the number and size of loads that are sensitive to voltage sags. The Dynamic Voltage Restorer (DVR^TM) is a power electronic device which has demonstrated its ability to protect sensitive loads. The primary advantage of the DVR^TM is that it only needs to be rated for a fraction of the total protected load, thereby yielding a very attractive cost/benefit. There are an increasing number of these loads with ratings much larger than can be accommodated with a single DVR^TM module. This paper describes the concept and successful operation of multi-module DVR^TM MV systems at a large paper mill and semiconductor manufacturing facilities. Field experience with the world´s first overhead platform-mounted DVR^TM MV system is also described