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Harmonic Performance Analysis of Static Var Compensator Connected to the Power Transmission Network

Ivana Damjanović orcid.org/0000-0002-7376-5421 ; University of Zagreb, Faculty of Electrical Engineering and Computing, Croatia
Frano Tomašević ; University of Zagreb, Faculty of Electrical Engineering and Computing, Croatia
Ivica Pavić ; University of Zagreb, Faculty of Electrical Engineering and Computing, Croatia
Božidar Filipović-Grčić orcid.org/0000-0002-2230-1336 ; University of Zagreb, Faculty of Electrical Engineering and Computing, Croatia
Alan Župan ; Croatian Transmission System Operator Ltd., Zagreb, Croatia

Sažetak

The static var compensator (SVC) is a device which is designed to compensate reactive power,
increase voltage stability and to reduce voltage fluctuations. Thyristor controlled reactors
(TCRs) are composed of reactors in series with bidirectional pair of thyristors. Current through
reactors can be continuously controlled by changing the firing angle of thyristor valves, thus
the inductive power can be easily controlled. Typical applications of TCRs in AC systems are
voltage stabilization and temporary overvoltage reduction, stability improvement, damping of
power oscillations and load balancing.
In this paper, harmonic performance analysis of SVC equipped with TCRs is presented. SVCs
utilizing TCRs generate harmonic currents and therefore it is necessary to determine the effect
of harmonics generated by the SVC on the power system and its elements. This includes
interaction of the SVC with the system, the SVC performance under balanced and unbalanced
operating conditions and finally, evaluation of countermeasures such as installation of harmonic
filters. In order to carry out these analysis, it is necessary to determine harmonic characteristics
of the network at the point of SVC connection, existing levels of harmonics, and to know
appropriate standards regarding acceptable harmonic levels in the power system. Since
harmonic distortions in the system are caused by the interaction between SVC and the system,
all system contingencies which may affect system’s frequency response should be evaluated.
Detailed power system model should be considered to make sure that parallel resonance points
of system do not directly coincide with characteristic harmonics from the SVC. Harmonics
generated by SVCs are largely dependent on the operating point within the SVC characteristic.
A conservative approach is to use the maximum values of harmonics generated within the
spectrum irrespective of the operating point. The results of harmonic performance analysis are
important for appropriate design of SVC. Harmonic performance analysis related to SVC
application which are presented in this paper include the determination of: frequency response
of the transmission network impedance required for the specification and design of filters; the
effects of SVC generated harmonics on the power system; the overall filter requirements and
countermeasures to reduce harmonics to acceptable levels

Ključne riječi

Static Var Compensator (SVC); thyristor-controlled reactors; harmonic performance study; filter design; frequency response of the network

Hrčak ID:

213478

URI

https://hrcak.srce.hr/213478

Datum izdavanja:

1.8.2018.

Posjeta: 973 *