Voltage SAG analysis in loop power distribution system with SFCL

Abstract

- Interruptions to supply and sags of distribution system voltage are the main aspects causing customer complaints. There is a need for analysis of supply reliability and voltage sag to relate system performance with network structure and equipment design parameters. This analysis can also give prediction of voltage dips, as well as relating traditional reliability and momentary outage measures to the properties of protection systems and to network impedances. Existing reliability analysis software often requires substantial training, lacks automated facilities, and suffers from data availability. Thus it requires time-consuming manual intervention for the study of large networks. Distribution system reliability can be divided into two aspects: system adequacy and system security. Adequacy describes the normal state capability of the system to supply customer demands. Security describes the ability of the system to continue to supply the customer in spite of faults in the network. In this paper, the improvement of the voltage sag is analyzed according to the fault location, resistance value of SFCL, and the length of the loop power distribution system. First, a resistor-type SFCL model is used using the MATLAB/SIMULINK. Next, the loop power distribution system is modeled. Finally, when the SFCL is installed in the radial or loop power distribution system with various lengths, voltage sags are evaluated according to various fault locations. The results of voltage sag analysis in the loop system are compared with the voltage sags in radial power distribution system. In extension to the work discussed in paper the system can be tested under different Loading conditions and a study on positioning of super conducting fault current limiter can be analyzed.