Digital simulation of the FACTS system with 60-pulse GTO-based Voltage Source Converter

The Flexible AC Transmission System (FACTS) controller devices based Voltage Source Converter (VSC) for shunt and series compensation, allocated in a substation, among the multiline transmission systems is presented in this paper. The paper proposes the full model comprising of the 60-pulse Gate Turn-Off (GTO) thyristor VSC that is constructed becomes the FACTS devices in digital simulation system and investigates the dynamic operation of control scheme for shunt and two series VSC for active and reactive power compensation and voltage stabilization of the electric grid network. The complete digital simulation of the shunt VSC operating as a Static Synchronous Compensator (STATCOM) controlling voltage and Var at bus, the series VSC operating as a Static Synchronous Series Capacitor (SSSC) controlling injected voltage while keeping injected voltage in quadrature with current, the two series VSCs operating as a Interline Power Flow Controller (IPFC) controlling injected voltage for power flow and the shunt VSC with the one series VSC operating as a Unified Power Flow Controller (UPFC) within the power system are performed in the MATLAB/Simulink environment using the Power System Blockset (PSB). The FACTS control system scheme and the network are modeled by specific electric blocks from the power system blockset. The controllers for the shunt VSC and two series VSCs are presented in this paper based on the decoupled current control strategy. The performance of the proposed FACTS device schemes connected to the 500-kV grid are evaluated and fully validated by digital simulation.