Controle de compensador série síncrono estático baseado em conversores multiníveis em cascata assimétrica

Abstract

The Static Synchronous Series Compensator (SSSC) is a FACTS (Flexible AC Transmission Systems) controller proposed in the literature to control the power flow through the transmission power lines. The SSSC is a series connected compensator based on static power electronics converters. In this work, three single-phase asymmetrical cascaded multilevel voltage source converters (VSC) are used, connected to the electric power system without transformers. The use of SSSC increases the stability limit, the controllability and the transfer power capacity of electric power systems. Since the voltage synthesized by SSSC is in quadrature with line current, it can be used to emulate a series reactance, to synthesize a voltage or to inject/absorb reactive power in series with the compensated transmission line. Five different control algorithms are investigated to control the output voltages of the SSSC. Digital simulation results are used to demonstrate the effectiveness of each control strategy.