Investigation into the compatibility and effectiveness of a new mathematical online voltage sag index

A new mathematical index is investigated in this paper which improves the power quality of a system through providing a tool for online voltage sag mitigation. The index is developed mathematically and applied on transmission and distribution networks. Furthermore, it is verified for its compatibility through the use of a tap changing transformer scheme. Two loading variation scenarios, consisting of induction motors are investigated for each type of network, in order to establish the effectiveness and accuracy of the index.

Keywords: voltage sag, induction motors, tap changer, mathematical index, power quality, transmission networks, distribution networks, loading variation