Enhancement of Interface Flow Limit using Static Synchronous Series Compensators

This paper addresses improving the voltage stability limit of interface flow between two different regions in electric power system using static synchronous series compensators (SSSC). The paper presents a power flow analysis model of SSSC, which is obtained from the injection model of a series voltage source inverter by adding the condition that the SSSC injection voltage is in quadrature with the current of SSSC-installed transmission line. This model is implemented into the modified continuation power flow (MCPF) to investigate the effect of SSSCs on the interface flow. A methodology for determining the interface flow margin is simply briefed. In case study, a 771-bus real system is used to verify that SSSCs enhance the voltage stability limit of interface flow