Constraints Violation Handling of SSSC with Multi-Control Modes in Newton-Raphson Load Flow Algorithm

The static synchronous series compensator (SSSC) is an important component of flexible AC transmission systems (FACTS) devices. SSSC can be used to control the active and reactive power flow in transmission lines. This paper presents a simplified model for SSSC in Newton-Raphson (NR) load flow algorithm. It also presents strategies for handling the operating constraints of SSSC including the series-injected voltage and current passing through this device. The presented strategies are based on modifying the specified active and reactive powers with the maximum limits of the operating constraints. However, the SSSC is simply implemented in NR load flow algorithm based on the power injection approach. In this model, the SSSC is represented as injected loads as a function of the desired power flow through the transmission line. The main advantages of this model are avoiding the modification of Jacobin matrix and reducing the complexities of incorporating SSSC in the load flow algorithm. Moreover, the resistance of SSSC is considered in this model. Standard IEEE 14-bus and 30-bus test systems are used to verify the performance of the developed model and strategies handling the constraints of the SSSC model. (C) 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.