A Novel Controller Based 48-Pulse STATCOM for Reactive Power Compensation and Voltage Stabilization in High Voltage Applications

Abstract—These paper presents the dynamic operation of a novel control scheme for Static Synchronous Compensator (STATCOM) based on a new full model comprising a 48-pulse Gate Turn-Off (GTO) thyristor voltage source converter for combined reactive power compensation and voltage stabilization of the electric grid network. The novel controller for the STATCOM presented in this paper is based on a decoupled strategy using the direct and quadrature components of the STATCOM current. The complete digital simulation of the STATCOM within the power system is performed in the MATLAB/Simulink environment using the Power System Blockset (PSB). The STATCOM scheme and the electric grid network are modeled by specific electric blocks from the power system blockset, while the control system is modeled using Simulink. The performance of ±100 Mvar STATCOM connected to the 500-kV grid is evaluated. The proposed novel control scheme for the STATCOM is fully validated for both the capacitive and inductive modes of operation by digital simulation. Index Terms—48-pulse GTO thyristor model STATCOM, novel decoupled control strategy, reactive compensation, voltage stabilization. I