Dynamic voltage sagswell compensator for industrial distribution system

Abstract EN

This paper presents analysis and performance of a mitigation device for compensation of voltage sag and voltage swell disturbances.

The device is designed with a fast switching IGBT operating in ac chopper mode, to regulate the primary voltage of a transformer with the principle of time-ratio control technique and maintain the load voltage to desired magnitude.

Peak voltage measurement using two adjacent samples of voltage is adopted for instantaneous detection of voltage sag/swell.

The advantages of less number of switching devices and high frequency harmonic currents which are easy to filter can be gained in this suggested control technique.

Also the compensating device does not require energy storage such as a capacitor or a battery.

Performance of the device is presented through simulation analysis for mitigation of various percentages of sag due to faults and induction motor starting, and swells due to capacitor switching.

Experimental results obtained from a prototype model are presented to validate the performance of the device.