Analysis of harmonic distortion levels on a distribution network

Nicholson, G.; Gosbell, V.J.; Parsotam, A.

doi:10.1109/aupec.2007.4548035

Cited by 12 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the discreet disturbances of harmonic distortion may not cause immediate and easily-observed impacts, it can cause some equipment to malfunction, and result in additional power losses in both customer and network equipment [17]. As harmonic levels change considerably from one week to another, it is very difficult to assess the long-term evolution of harmonic levels only from measurements carried out over a short period [1].…”

Section: Discussionmentioning

confidence: 99%

Power Quality Issues Concerning Photovoltaic Generation in Distribution Grids

Niitsoo

Jarkovoi²,

Taklaja³

et al. 2015

SGRE

View full text Add to dashboard Cite

Unregulated utilization of renewable generation including residential photovoltaic (PV) systems can have a significant impact on load characteristics in distribution networks. For improving PV generation capabilities, power quality aspects have to be coordinated with present load characteristics. This paper discusses the harmonic content of PV generation and the influence to power quality indicators in residential distribution networks. PV generation measurement results including current harmonic amplitude and phase angle values are presented. Results of different modelling scenarios are analysed and a simplified model of harmonics in PVs is offered. The results of the study showed a moderate additional harmonic distortion in residential load current and voltage distortion at the substation's busbar when PVs were added. Novelty of the paper is that harmonic current values at higher orders are presented and analysed. The results pointed out in this paper could be further used for modelling the actual harmonic loads of the PVs in distribution networks.

show abstract

Section: Discussionmentioning

confidence: 99%

Power Quality Issues Concerning Photovoltaic Generation in Distribution Grids

Niitsoo

Jarkovoi²,

Taklaja³

et al. 2015

SGRE

View full text Add to dashboard Cite

show abstract

“…The observed characteristics of the signal, f(t) is extracted using convolution integral given in Equation. (5).…”

Section: Density Function Of Prolonged Interruption and Under-voltagementioning

confidence: 99%

“…In another work which studied probability distribution of PQ data with special interest on the locations and occurrence time of disturbances. An Auckland real-life power data installed in over 30 monitoring sites has been surveyed by Vector Ltd since 1999 [5].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2023

ATCP

View full text Add to dashboard Cite

The paper examines a distribution system field data for the assessment of voltage variation and supply interruption. The under voltage has severe impacts on the consumer loads working conditions causing overloads and high transmission losses. The under-voltage limit has been set for voltage below 0.9p.u. The measurement was conducted in the control room for the duration of one week for logging interval of 1-min using Fluke VR1710 that monitors single-phase voltage quality of power network. Long duration variations are considered to be present when the limits are exceeded for greater than 1-minute time lapse. In this paper, the lowest interruption duration recorded was 20 minutes while the number of under-voltages was 41 occurrences. A simple mathematical analysis of power flow deviation was determined for correlation with the frequency disturbances recorded by the equipment. Both measurements and simulation results show that frequency rapidly changes in the network. The lowest and highest frequency vary between (48.7665 Hz to 51.196 Hz) and (48.843 Hz to 51.263 Hz) respectively. Thus, voltage and frequency disturbance statistics vindicate the voltage variation in the site to be within the ±10% limits but the overall performance of frequency monitored in the site violated the operational limits of ±0.2 Hz (i.e. 49.8 Hz to 50.2 Hz) and ±0.5 Hz (i.e. 49.5 Hz to 50.5 Hz) for the statutory regulatory. The paper would provide repository data as point of reference for Electric power sector reform act No.6 2005.

show abstract

“…The results of their analysis are presented in numerous publications. Most of them consider low-and medium-voltage networks [1]- [4]. It is found out that the harmonic conditions in the electrical networks represent a random phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Research into harmonic power in the high- voltage networks

Коверникова¹

2016

REPQJ

View full text Add to dashboard Cite

Abstract. The paper presents the results of studies on the harmonic active and reactive power at nodes of 110 kV and 220 kV networks. The studies were based on the measurements made at the node of 110 kV network supplying power to an aluminum plant and at the node of 220 kV network supplying power to railway traction substation. The supply networks belong to the Unified Energy Systems of Russia. Many other facilities with high-power nonlinear loads receive electric energy from these networks. They make their contribution to the formation of harmonic conditions across the networks. The measurements of currents and voltages were used to calculate active and reactive power for harmonics 2-40. The calculations show that although the considered facilities are the sources of harmonics and generate harmonic power to the supply networks they also receive harmonic power from them. The harmonic active power flows change directions during the measurements. Their values vary in a wide range and can reach several tens of kilowatts. The values of harmonic reactive power also vary in a wide range. They change the direction of the flow and affect the values of voltage, as a rule, at the characteristic harmonics of the nonlinear electrical equipment.

show abstract

Analysis of harmonic distortion levels on a distribution network

Cited by 12 publications

References 4 publications

Power Quality Issues Concerning Photovoltaic Generation in Distribution Grids

Power Quality Issues Concerning Photovoltaic Generation in Distribution Grids

Untitled

Research into harmonic power in the high- voltage networks

Contact Info

Product

Resources

About