Abstract
The paper present control scheme and investigates dynamic operation of static synchronous compensator (STATCOM) in both inductive and capacitive mode based on model comprising a full 48-pulse GTO voltage source converter for combined reactive power compensation and voltage stabilization of the electric grid network. The key STATCOM device is power electronic GTO converters connected in parallel with the power system grid and is controlled by presented tri-loop controller based on d-q transformation. The complete digital simulation of the STATCOM within the power system is performed in the MATLAB/Simulink environment using the power system block-sets. The STATCOM scheme and the electric grid network are modeled by specific electric blocks from the power system black-sets while the control system is modeled using Simulink. The STATCOM controller is presented in this paper based on a decoupled current control strategy to ensure stable operation of the STATCOM under load switches. The reactive compensation scheme with an external dc power supply can also compensate for any voltage drops across resistive component of the transmission line impedance. The presented controller uses a phase locked loop (PLL) with reduced inherent time delay to improve the transient performance of the STATCOM. The performance of STATCOM schemes connected to the 230 kV grid is evaluated and fully validated by digital simulation.
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