Thyristor Switched Reactor Research Articles

Experimental studies of a scaled-down TSR-based SVC and TCR-based SVC prototype for voltage regulation and compensation

In this paper, prototypes of two shunt flexible AC transmission system (FACTS) devices, a thyristor switched reactor (TSR)-based static VAr compensator (SVC) and a thyristor controlled reactor (TCR)-based static VAr compensator- have been developed. The design and testing of both a TSR-based SVC and a TCR-based SVC are accomplished in the Power Systems Research Laboratory of Nigde University. The TSR-based SVC and TCR-based SVC devices are studied in three-bus and single machine infinite bus systems for three-phase static load conditions. The effects of TSR-based SVC and TCR-based SVC devices on load voltages are also analyzed. Experimental results show that significant improvement in reactive power compensation and voltage regulation is achieved by using TSR-based SVC and TCR-based SVC.

An educational software package for Thyristor Switched Reactive Power Compensators using Matlab/Simulink

In this paper, an educational software package called TSCOM (Thyristor Switched Reactive Power Compensators) has been developed. The TSCOM software package contains simulation models of Thyristor Switched Capacitor (TSC) and Thyristor Switched Reactor (TSR)-based Static VAr Compensator (SVC) which are two of the shunt Flexible AC Transmission Systems (FACTS) devices. The design and simulations of TSC and TSR-based SVC are proposed using the Matlab/Simulink 7.04® and SimPowerSystems. The TSC and TSR-based SVC devices are demonstrated at two bus, three bus, infinite-bus, single-phase, three-phase, static load, dynamic load and stair-case load conditions. The effects of TSC and TSR-based SVC devices on load voltage are also analyzed. Student feedback indicates that this package is user-friendly and considerably effective for students and researchers to study theory of switched compensators, the reactive power control and voltage regulation. The proposed package will help to design the practical prototypes for students and researchers.

Discrete-Event Systems Supervisory Control for a Dynamic Flow Controller

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper presents supervisory control of a dynamic flow controller (DFC) based on the discrete-event systems (DES) theory. A DFC can be considered as a flexible ac transmission system controller and includes a mechanically-switched phase-shifting transformer, a multimodule thyristor-switched capacitor, a multimodule thyristor-switched reactor, and a mechanically switched capacitor. Owing to the inherent discrete switching nature of a DFC, its components are modeled as finite automata; then, a DES supervisory control is designed to implement the control logic of the DFC system in different modes of operation (i.e., “automatic” and “auto/manual”). It is shown that the specifications are controllable and the synthesized supervisors are nonblocking in both modes and the modular supervisors nonconflict in auto/manual mode. </para>

Design and operational testing on thyristor modules for the SVC Kemps Creek

The design and operational testing of valves for the SVC (static Var compensator) to be installed at Kemps Creek substation in Australia are discussed. The most important design principles and features of the thyristor modules are given. Operational tests carried out on the thyristor modules are described; for this test program, noteworthy test circuits have been set up to perform both TSR (thyristor switched reactor) and TSC (thyristor switched capacitor) fault current tests with high test values and special waveforms. Test results and test circuits are presented. >

Optimal control of a static VAR compensator for minimization of line loss

Abstract A fast calculation method to calculate the firing angle of a thyristor-controlled reactor (TCR) and/or the number of thyristor-switched reactor (TSR) ‘switch-ons’ and/or the number of thyristor-switched capacitor (TSC) ‘switch-ons’ for four types of static VAR compensator (SVC) is proposed in this paper. The calculation is an optimal compensation problem that is written in terms of the minimization of power line loss by minimizing the line currents. The three-phase unbalanced line currents after installation of an optimal reactive power compensator will become three-phase balanced line currents. In this paper, theoretical derivations and the computation procedures are formulated. A numerical example for real-time simulation is discussed to demonstrate the performance of the proposed method and to support the application capability.

Slope reactance effects in single-phase saturated reactors

The paper presents an analysis of the single-phase saturated reactor using a mathematical model based on a 2-state switched linear circuit theory. It is shown that the observed incremental fundamental-frequency voltage/current characteristic is not an image of the B/H characteristic of the core, but when saturated corresponds to a reactance that is greater than the leakage reactance of the reactor. This increase is due to the inherent control action of the iron core and is influenced by the harmonic content of the terminal voltage of the saturated reactor. From the theory developed, the saturated reactor is seen to complete its full transient response in half a cycle. Experimental results using 100 VA models of both a saturated reactor and an equivalently controlled thyristor-switched reactor are given to confirm the theory.