Fault Current Limiting using DSSC on the existing Transmission Lines

Abstract

Flexible AC Transmission System (FACTS) provides a possibility to enable utilization of the existing transmission line to its full power flow rating. Distributed-FACTS converters proven to be the new horizon in power system operation and control. It is capable of controlling power flow with low cost and high reliability. Distributed Static Series Compensator (DSSC) is a series D-FACTS device which is distributed over the existing line. It is similar to lumped series FACTS device i.e. SSSC. This paper presents DSSC to limit fault current in the transmission system. The prime function of DSSC is to enable network to control power flow in the lines. DSSC is a single-phase inverter which is low power, light in weight and it can be directly attached on the existing transmission conductor. It is emulating inductive and capacitive reactance and alters line reactance to control active power flow in the lines. Scope of this DSSC devices to reduce fault current is presented. A fault current in DSSC compensated transmission line is investigated in this paper. MATLAB Simulink results are presented to validate DSSC operation in fault condition.