Abstract
In this study, the traditional thyristor controlled reactor is conditioned to be an almost harmonic-free inductive static Var compensator. The proposed configuration is constructed of a traditional TCR shunted by a parallel resonance circuit and the parallel combination is connected in series to a series resonance circuit. The parallel and series resonance circuits are tuned at the power system fundamental frequency. The series resonance circuit offers almost short circuit to the AC source current fundamental, while it offers very high impedance to the harmonic current components released by the TCR. The parallel resonance circuit offers very high impedance to the AC source current fundamental, while it offers almost short circuits to the harmonic current components released by the TCR. The two circuits operate coherently such that negligible current harmonics are permitted to flow in the AC source side. This type of harmonic treatment is not sensitive to other harmonic sources in the power system network, where this compensator is installed. The no load operating losses of this compensator are negligible compared to its reactive power rating. The proposed compensator is designed and tested on PSpice.
Highlights
Static Var compensators are very essential in reactive power control applications for power quality improvement purposes
PSpice simulation results ensure that the third harmonic current components flowing in the AC source side is reduced to about 0.075 the component released by the TCR
The third harmonic current component flowing in the AC source side will never exceed 1% of the compensator reactive current rating
Summary
Static Var compensators are very essential in reactive power control applications for power quality improvement purposes. Static Var compensators that offer continuous control of reactive power absorption are either conventional thyristor-controlled reactors (Gyugyi, 1988; Paziuk et al, 1989; Chen et al, 1999; Lee and Wu, 2000; Xu et al, 2010), or STATCOMS (Moran et al, 1993; Valderrama et al, 2001) Both compensators release noticeable current harmonics, but the TCR can operate at higher voltage and current ratings (Best and ZelayaDe La Parra, 1996; Jalali et al, 1996; IEEE, PES Harmonic Working Group, 2001). The design of these filters depends on the AC short circuit level at the location where the TCR should be installed (IEEE, PES Harmonic Working Group, 2001) These filters will dissipate a lot of losses and generate large amounts of undesirable reactive power at the AC supply fundamental. Many techniques were presented to treat TCR harmonics without using harmonic filters such as using sequential control of transformer taps and asymmetrical firing to a TCR to minimize certain harmonics, but both techniques have limited outcomes (Patel and Dubey, 1983; Funabiki and Himei, 1985)
Sign-in/Register to view highlights & summary 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 callMore From: Research Journal of Applied Sciences, Engineering and Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
