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Synchrophasors-based transmission line protection in the presence of STATCOM

Ghorbani Amir

Journal of Power Technologies

2023

Vol. 103, nr 1

58--71

The distance relay using the transmission line impedance measurement identifies the type and location of the fault. However, any other factors that cause the failure of the measured impedance, makes the relay detect the fault in incorrect location or do not detect the fault at all. One of these factors is the fault resistance which directly increases the measured impedance by the relay. Another factor that indirectly alters the impedance of the transmission line is static synchronous compensator (STATCOM). When a fault happens, current injection by the STATCOM changes the measured signals by the relay and thus makes the calculated impedance incorrect. In this paper, a method is provided based on the combination of distance and differential protection. Firstly, from the current data of buses, faulted transmission line is detected. Then using the presented algorithm, the fault location is calculated on the transmission line. The basis of the algorithm is on the active power calculation of the buses. Fault resistance is calculated from the active powers and its effect will be deducted from calculated impedance by the algorithm. Furthermore, with choosing data of appropriate bus, STATCOM effect is eliminated, and fault location will be obtained.

The 48-pulse VSC-based generalized interline power-flow controller (GIPFC)

Ghorbani Amir

Journal of Power Technologies

2019

Vol. 99, nr 1

31--39

The generalized interline power-flow controller (GIPFC) is a voltage-source controller (VSC)-based flexible ac transmission system (FACTS) controller that can independently regularize the power-flow over each transmission line of a multiline system. This paper presents a modeling and performance analysis of GIPFC based on 48-pulsed voltage-source converters. This paper deals with a cascaded multilevel converter model, which is a 48-pulse (three levels) source converter. The voltage source converter described in this paper is a harmonic neutralized, 48-pulse GTO converter. The GIPFC controller is based on d-q orthogonal coordinates. The algorithm is verified using simulations in MATLAB/Simulink environment. Comparisons between Unified Power Flow Controller (UPFC) and GIPFC are also included.