Reactive power compensation in a multi‐line system under sinusoidal unbalanced conditions

Jeon, Seong-Jeub; Willems, J. L.

doi:10.1002/cta.629

Cited by 20 publications

(18 citation statements)

References 18 publications

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“…The analysis can be extended to poly-phase system with an arbitrary number of phases and wires [14]. Also other objectives of compensation can be considered: a sinusoidal supply current, a supply current with the same harmonics as the voltage, a positive sequence supply current, ...…”

Section: Further Discussionmentioning

confidence: 99%

Reflections on power theories for poly-phase nonsinusoidal voltages and currents

Willems

2010

2010 International School on Nonsinusoidal Currents and Compensation

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Section: Further Discussionmentioning

confidence: 99%

Reflections on power theories for poly-phase nonsinusoidal voltages and currents

Willems

2010

2010 International School on Nonsinusoidal Currents and Compensation

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“…Those zero-sequence currents could be compensated by passive elements such as are described in reference [11], but the simplest compensation method is to equitably distribute the wye loads. The simulator presented in this paper provides the impedance values of the optimal wye load that minimizes the zero-sequence line currents.…”

Section: Reactive and Imbalance Load Compensation Devices And Methodsmentioning

confidence: 99%

“…The reactive and unbalanced compensators must minimize the positive-sequence reactive currents and the negative-sequence currents supplied to the wye and delta loads. Those passive compensators are built by three-phase delta connections of coils and capacitors, whose values are determined in the same manner as it was explained in references [11][12][13]. Our compensators are connected in delta for two reasons, mainly: (1) to simplify the topology; and (2) to apply quasi-balanced line to line voltages to the elements of those devices.…”

Section: Introductionmentioning

confidence: 99%

Four-Wire Delta Service Sinusoidal Operation and Compensation Simulator

León-Martínez

Montañana-Romeu

Radda³

et al. 2015

Energies

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An off-line simulator based on Excel used to evaluate the operation of four-wire delta (4WD) services as well as the effects of reactive and imbalance compensators in sinusoidal steady-state conditions is described in this paper. Voltages, currents and powers in the primary and secondary windings of the transformer as well as in the high voltage (HV) and low voltage (LV) lines and in the loads are calculated through that simulator. The apparent powers in the mains, transformer and loads are determined applying Buchholz's and unified power measurement (UPM) formulations in both scalar and vector notations. The effects of the neutral current are especially examined, in order to minimize them, and the optimal wye load distribution is determined by the simulator. The simulator provides the necessary elements of passive reactive and unbalanced compensators that optimize the 4WD transformer operation too. Those compensators are determined for each load, and they can be separately selected and included in the simulation process or not. An application example is finally used to step by step explain how the simulator runs.

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“…3 The 3-phase voltage source converter (VSC), which can provide a sinusoidal current to the grid and bidirectional power flow, is widely used in these renewable power generation systems. [7][8][9] In Von Jouanne and Banerjee, 10 it is illustrated that the unbalanced voltage will cause a third-order harmonic current at the ac output of the VSC. The performance of VSCs degrades with the current distortion characterized by a large amount of harmonics.…”

Section: Introductionmentioning

confidence: 99%

Compensation method of phase‐locked loop under unbalanced grid condition based on harmonic linearization

Zha

Cen

Huang

et al. 2018

Circuit Theory & Apps

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The voltage source converter (VSC) is often faced with unbalanced grid conditions that will degrade its performance because of the distorted current with a large amount of harmonics. One of the main parts of current distortion is the third-order harmonics caused by the negative-sequence voltage component at the fundamental frequency. The distorted output of the synchronous reference frame phase-locked loop (SRF-PLL) due to the unbalanced grid voltage is the main reason for the existence of the harmonics. This paper analyzes the mechanism of the generation of harmonics currents and proposes a compensation method for the PLL in VSCs based on the harmonic linearization method without changing the structure of SRF-PLL. The proposed PLL can work properly under unbalanced grid conditions and has a good dynamic response. The third-order current harmonics are reduced significantly by using the proposed PLL instead of the conventional SRF-PLL without changing the current control strategy of VSC. The compensation method is verified by cycle-by-cycle circuit simulations and controller hardware-in-the-loop experiments.

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Reactive power compensation in a multi‐line system under sinusoidal unbalanced conditions

Cited by 20 publications

References 18 publications

Reflections on power theories for poly-phase nonsinusoidal voltages and currents

Reflections on power theories for poly-phase nonsinusoidal voltages and currents

Four-Wire Delta Service Sinusoidal Operation and Compensation Simulator

Compensation method of phase‐locked loop under unbalanced grid condition based on harmonic linearization

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