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    On the remote calibration of voltage transformers: validation of opportunity 

    Rens, Sané; Rens, Johan; Holm, Johann; Botha, Gerhard; Desmet, Jan (IEEE, 2018)
    Remote calibration of instrument transformers seems possible if sufficient certainty in field measurements can be achieved. This opportunity, until now, was only investigated from a theoretical point of view and in this ...
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    Measurement uncertainty of current harmonics during the assessment of compliance to grid code requirements 

    Maraiz, Zander; Rens, Johan; Peterson, Brandon; Botha, Gerhard (IEEE, 2018)
    This paper improves the impact of measurement uncertainty on harmonic grid code compliance assessment by characterization of the current transformers at a renewable power producer. Field data was collected to evaluate the ...
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    Impact of aggregation interval on harmonic phase angle measurements 

    Peterson, Brandon; Rens, Johan; Botha, Gerhard; Blanco, Ana Maria; Meyer, Jan (IEEE, 2018)
    The aggregation principles of IEC 61000-4-30 is a well-known concept implemented in Power Quality (PQ) recorders. Only rms data is retained. Harmonic emission assessment requires the analysis of harmonic phasors. Continuous ...
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    Attenuation effect with non-linear loads for small stand-alone grids 

    Bottenberg, Agknaton; Rens, Johan; Van Ryckeghem, Jurgen; Debruyne, Colin; Knockaert, Jos (IEEE, 2016)
    This paper presents the effect of non-linear loads on the overall voltage quality in small powered stand-alone (islanded) systems. The iterative effect between current and voltage distortion is related to the source's ...
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    The application of modern technology in power quality management 

    Stander, Tiaan; Rens, Johan (IEEE, 2009)
    Little business integration of power quality management (PQM) is forthcoming amongst electrical utilities all over Southern Africa. Restricted access to proper information is the main reason. A integration of tools, ...
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    Evaluation of harmonic distortion from multiple renewable sources at a distribution substation 

    Peterson, Brandon; Rens, Johan; Botha, Gerhard; Meyer, Jan; Desmet, Jan (IEEE, 2017)
    Harmonic emission assessment in a distribution network with existing background voltage harmonics is a challenge for Renewable Power Producers (RPP) aiming to achieve grid code compliance. Dynamic interaction of harmonic ...
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    Continuous harmonic impedance assessment using online measurements 

    Serfontein, Duan; Rens, Johan; Botha, Gerhard; Desmet, Jan (IEEE, 2015)
    The quantification of harmonic emission requires an accurate representation of the network harmonic impedances. A number of techniques have been proposed to make the assessment of the network harmonic impedances practical ...
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    Testing of a predictive pole-slip protection algorithm on a real time digital simulator 

    Lamont, Lafras; Rens, Johan; De Kock, Jan (IEEE, 2016)
    Predictive pole-slip protection is not implemented in commercially available protection relays. All pole-slip protection relays on the market will only trip a generator after it has pole-slipped one or more times. A ...
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    Field performance of ambient modal estimation in small signal stability 

    Van Rooyen, Tian; Rens, Johan; Desmet, Jan (IEEE, 2015)
    Small signal stability is one focus of Wide Area Measurement Systems (WAMS). WAMS systems are becoming more widespread, driven by availability of synchrophasor data from Phasor Measurement Units (PMUs). In this paper, two ...
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    Real-time power system oscillation monitoring using synchrophasor measurements 

    Van Rooyen, Tian; Rens, Johan (IEEE, 2015)
    Inter-area oscillations impact negatively on power system stability and power transfer capability. Monitoring oscillations in real time can improve control of the power system. Synchrophasor data from Phasor Measurement ...
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    Rens, Johan (26)
    Botha, Gerhard (10)Desmet, Jan (9)Peterson, Brandon (5)Serfontein, Duan (4)De Kock, Jan (3)Debruyne, Colin (3)Meyer, Jan (3)Stander, Tiaan (3)Van Rooyen, Tian (3)... View MoreSubjectPower quality (4)Energy efficiency (3)Harmonic emission (3)Network harmonic impedances (3)Noninvasive (3)Online measurements (3)Power system harmonics (3)PQ (3)Synchronous machines (3)Grid code compliance (2)... View MoreDate Issued2016 (5)2015 (4)2017 (4)2018 (4)2009 (3)2011 (3)2014 (3)Has File(s)
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