Evaluating Power System Unbalance in the Presence of Harmonic Distortion

Zheng, Zihao; Makram,; Girgis,

doi:10.1109/mper.2002.4312498

Cited by 13 publications

(31 citation statements)

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“…A method identical to (8) and (9) is applied to the phase voltages. This original method for determining the phase sequence components not require the use of Fortescue transformation matrices as follows in [7][8].…”

Section: Voltage and Current Components In Unbalance And Nonsinusoidamentioning

confidence: 99%

New Approach to Assess Unbalance and Harmonic Distortion in Power Systems

Salmerón

Pérez

Litrán

2024

RE&PQJ

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This paper presents a new decomposition of the apparent power for power systems in unbalance conditions and harmonic distortion at Std. 1459 framework. From the new terms of power defined, a set of appropriate indicators to assess the unbalance in terms of harmonic distortion are introduced. From here, we obtain the balanced and unbalanced components for each set of voltage and current harmonics. The process is carried out through the application of the FFT to the Park vectors of voltage and current. This allows to develop an efficient algorithm from the computational point of view.. The algorithm has been implemented in a virtual instrument for measurements of a practical case. The results obtained show the utility of the proposed approach to assess the unbalance in the presence of distortion.

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Section: Voltage and Current Components In Unbalance And Nonsinusoidamentioning

confidence: 99%

New Approach to Assess Unbalance and Harmonic Distortion in Power Systems

Salmerón

Pérez

Litrán

2024

RE&PQJ

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“…Thereupon, these indices can be weighted and can thus take into account the amount of power transferred by each phase. Another point of view to quantify unbalance is recently given in [9]- [11]. In these papers, the unbalance factor and the distortion factor are considered together.…”

Section: Framework Of the Power Quality Indicesmentioning

confidence: 99%

Power quality improvements through power electronic interfaced distributed generation

et al. 2010

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Abstract-In low-voltage distribution networks a large amount of single-phase nonlinear loads are connected. This leads to the combined presence of power system unbalance and harmonic distortion. The research presented in this paper focusses on these steady-state power quality problems. It uses a harmonic load flow program, implemented in symmetrical components, to investigate the influence of several single-phase inverter control strategies used to connect any kind of primary energy source to the grid. The influence of these single-phase distributed generation units in the three-phase four-wire distribution network is discussed by means of two recently formulated indicators that combine the power system unbalance and the existing harmonics.

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“…In this last case, with an appropriated control strategy, it is possible to eliminate the harmonics and unbalance of the current, as well as to obtain a conditioned voltage at the load terminals. The need for the availability of the power terms and the associated indices, to characterize the resultant mitigation, requires a model of decomposition of the apparent power that splits the contribution of the harmonics to the unbalance, [7,8]. In this paper, an alternative decomposition of the apparent power is proposed, in the frame of Std.…”

Section: Introductionmentioning

confidence: 99%

Assessment of unbalance and distortion in power systems that include active power line conditioners.

Prieto¹,

Revuelta²,

Vallés³

et al. 2024

RE&PQJ

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This paper presents a decomposition of the apparent power of a system that allows to separate the contribution to the unbalance of the whole set of harmonics of voltages and currents. From this set of power terms, the unbalanced fundamental, balanced harmonics and unbalanced harmonic indices are derived, that allow to evaluate separately the distortion and the unbalance. This procedure gives a more appropriate way to characterize the mitigation obtained using modern equipments with active compensation. These new indicators of the electric power quality have been applied here to a system with unbalance and distortion in the supply and the load, before and after the connection of a parallel active compensator, and with the connection of a series-parallel active compensator. The results obtained with a dedicated experimental platform have allowed to verify the validity of the new proposed indices.

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Evaluating Power System Unbalance in the Presence of Harmonic Distortion

Cited by 13 publications

References 0 publications

New Approach to Assess Unbalance and Harmonic Distortion in Power Systems

New Approach to Assess Unbalance and Harmonic Distortion in Power Systems

Power quality improvements through power electronic interfaced distributed generation

Assessment of unbalance and distortion in power systems that include active power line conditioners.

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