Abstract
The Generalized Unified Power Flow Controller (GUPFC) is a Voltage Source Converter (VSC) based Flexible AC Transmission System (FACTS) controller for shunt and series compensation among the multiline transmission systems of a substation. The paper proposes a full model comprising of 60-pulse Gate Turn-Off thyristor VSC that is constructed becomes the GUPFC 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 at bus and two series VSC operating as a Static Synchronous Series Capacitor (SSSC) controlling injected voltage, while keeping injected voltage in quadrature with current within the power system is performed in the MATLAB/Simulink environment using the Power System Block set (PSB). The GUPFC, control system scheme and the electric grid network are modelled by specific electric blocks from the power system block set. The controllers for the shunt VSC and two series VSCs are pre- sented in this paper based on the decoupled current control strategy. The performance of GUPFC scheme connected to the 500-kV grid is evaluated. The proposed GUPFC controller scheme is fully validated by digital simulation.
Highlights
The availability of Gate Turn-Off (GTO) thyristor switching devices with high-power handling capability and the advancement of the other types of power-semiconductor devices such as IGBTs have been led to the development of fast controllable active and reactive power sources utilizing power electronic switching and converter technology
This paper proposes the Generalized Unified Power Flow Controller (GUPFC) in digital simulation system using a cascaded multilevel converter model, where using a 60-pulse (3-levels) Voltage Source Converter (VSC) that is introduced in this paper
The GUPFC located at the left end of the 200 km line L2, between the 500 kV buses B1 and B5, and 75 km line L1, between the 500 kV buses B1 and B2, is used to control the active and reactive powers flowing through bus B2 and B5 while controlling voltage at bus B1
Summary
Reactive power flows on the two series compensated lines as well as the sending end bus voltage of the GUPFC [2]. The GTO thyristors enable the design of the solid-state shunt reactive compensation and active filtering equipment based upon switching converter technology These Power Quality Devices (PQ Devices) are power electronic converters connected in parallel or in series with transmission lines, and the operation is controlled by digital controllers. FACTS devices are usually used for fast dynamic control of voltage, impedance, and phase angle of high-voltage ac lines. While one VSC regulates the DC voltage, the other one controls the reactive power flows in the lines by injecting series active voltage. The investigation of the dynamic operation of control scheme for both STATCOM and SSSC based on a new full model comprising a 48-pulse GTO voltage source converter for combined reactive power compensation and voltage stabilization of the electric grid network. The five transformer primary windings are connected in series for two series VSC, and the converter pulse patterns are phase shifted so that the five voltage fundamental components sum in phase on the primary side
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
