A Framework for Regulation of RMS Voltage and Short-Duration Under and Overvoltages

This paper proposes a general approach for voltage- quality regulation. The same framework covers voltage-amplitude variations, dips, and swells. The framework uses the difference between power-quality events and power-quality variations to in- troduce a “responsibility-sharing curve” distinguishing between normal operational voltage for which equipment should be im- mune and events that are subject to voltage-quality regulation. It is further proposed to use equipment immunity requirements as a basis for the responsibility-sharing curve.