Harmonic minimization in the operation of static VAR compensators for unbalanced reactive power compensation

Thukaram, D; Khincha, H.P.; Ravikumar, B

doi:10.1109/icpst.2004.1460015

Cited by 22 publications

(8 citation statements)

References 11 publications

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“…Thukaram et al in [8] have analyzed a fixed capacitorthyristor-controlled reactor (FC-TCR) type of compensator for minimum harmonic injections in terms of . The authors have concluded that the compensator operation beyond a certain range of triggering delay angles may increase the harmonic components and, thus, the compensator capacitor and reactor size should be selected based on the overall requirement of meeting the loads.…”

Section: Comparison With Current Technologymentioning

confidence: 99%

ANN-Based SVC Switching at Distribution Level for Minimal-Injected Harmonics

Kulkarni¹,

Udupi²

2010

IEEE Trans. Power Delivery

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Electrical distribution system suffers from various problems, such as reactive power burden, unbalanced loading, voltage regulation, and harmonic distortion. Though DSTAT-COMS are ideal solutions for these systems, they can be costly and have complexity compared to other reactive power compensation solutions. Phasewise-balanced reactive power compensations are required for fast-changing loads needing dynamic power factor correcting devices leading to terminal voltage stabilization. Static var compensators (SVCs) are preferred for these loads due to low cost and simple control strategy. These SVCs, while correcting power factor, inherently create harmonics due to the nonsinusoidal currents caused by the operation of thyristor-controlled reactors. This paper proposes minimizing the harmonics injected into the distribution systems with the operation of TSC-TCR-type SVC used in conjunction with fast-changing loads at the LV distribution level. The fuzzy logic system and ANNare used to solve this nonlinear problem, giving optimum triggering delay angles used to trigger thyristors in TCR. The scheme is attractive and can be used at SVC installations in distribution systems for steady-state reactive power compensation.Index Terms-Artificial neural network (ANN), fuzzy logic control, harmonic distortion, reactive power, static var compensators.

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Section: Comparison With Current Technologymentioning

confidence: 99%

ANN-Based SVC Switching at Distribution Level for Minimal-Injected Harmonics

Kulkarni¹,

Udupi²

2010

IEEE Trans. Power Delivery

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“…Since the fundamental currents are in the same phase for both bank line currents, the maximum value of total TCR fundamental current (for triggering angle 90°) is given below: (17) Since the relative values of L 1 and L 2 are fixed in (13), combining (15) and (16), the maximum value of total TCR fundamental current (for triggering angle 90°) is given below:…”

Section: Bankmentioning

confidence: 99%

Three‐phase thyristor controlled reactor using two sets of delta connected switches with low current harmonics

Maiti

Mukhopadhyay²,

Biswas

2019

IET Power Electronics

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This work presents a three-phase thyristor-controlled reactor (TCR), which makes use of two constituent banks of controlled reactors, with coordinated control of the triggering angle of both the banks. The first reactor bank has a set of 'delta' connected back-to-back thyristor switches with a balanced set of reactors in series with each switch, while the second reactor bank also has back-to-back thyristor switches in 'delta' connection but with a balanced set of reactors in series with each line. It is demonstrated that this arrangement prevents some major current harmonics in the supply line by proper choice of the maximum kVAr ratio between the two reactor banks. The use of delta connected switches in both banks reduces the current rating of the switches. Hence, without using any phase-shifting isolation transformer or filters, the proposed technique permits control of reactive power over a reasonable range, with a low current total harmonic distortion meeting existing harmonics standards. Simple construction and operation of the proposed TCR make it an attractive and cheaper solution. The modelling, analysis and performance assessment of the new TCR are presented.

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“…On the other hand when Q comp is negative, and its magnitude is more than rated value then the controller sets α corresponding to maximum TCR reactive power Q max . Otherwise, the calculated Q comp is directly used for α generation following (39) and (40), described in Section 7.…”

Section: Computation Of Firing Angle αmentioning

confidence: 99%

“…However, these schemes need additional investment [37] and space to accommodate filtering stages. Thus, improvement of switching schemes of SVC is also studied to minimise harmonics generated by TCR without using additional filter [38][39][40][41]. However, these switching schemes are insufficient to a wider range of TCR harmonics as well as harmonics generated by non-linear load.…”

Section: Introductionmentioning

confidence: 99%