Browsing Conference Papers - Potchefstroom Campus by Author "Desmet, Jan"
Now showing items 1-11 of 11
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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 ... -
Dc-bus voltage balancing controllers for split dc-link four-wire inverters and their impact on the quality of the injected currents
Bozalakov, Dimitar; Rens, Johan; Meersman, Bart; Bottenberg, Agknaton; Desmet, Jan (IET, 2017)The increasing share of single-phase distributed generation units in low-voltage grids causes voltage unbalance problems and overvoltages. Therefore, the need for power quality improving control strategies of grid-connected ... -
Decongestion of the distribution grid via optimised location of PV-battery systems
Van Ryckeghem, Jurgen; Rens, Johan; Delerue, Thijs; Bottenberg, Agknaton; Desmet, Jan (IET, 2017)In order to achieve the energy targets for 2020, further integration of renewable energy sources is required. Hence, there was a need to investigate possible solutions to achieve a reliable network without loss of production. ... -
A discriminative approach to harmonic emission assessment
Peterson, Brandon; Rens, Johan; Botha, Gerhard; Desmet, Jan (IEEE, 2015)With the onset of renewable power sources onto the network, such as Photovoltaic power plants contributing to Total Harmonic Distortion (THD) in voltage, a methodology to quantify their contribution to the THD in voltage ... -
The effect of a reduced power quality on the energy efficiency of stand-alone generator systems
Debruyne, Colin; Rens, Johan; De Kock, Jan; Desmet, Jan (IEEE, 2016)It has already been thoroughly validated that the efficiency of direct online motors is susceptible towards certain power quality parameters such as voltage unbalance or harmonic voltage distortion. It can be assumed that ... -
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 ... -
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 ... -
Harmonic emission assessment on a distribution network: the opportunity for the prevailing angle in harmonic phasors
Peterson, Brandon; Rens, Johan; Desmet, Jan (IET, 2017)Harmonic emission assessment in high-voltage networks with a number of renewable power plants (RPP) interconnected is challenging. A sound scientific methodology readily accessible to engineers is needed to validate ... -
Improved event based method for harmonic impedance assessment
Serfontein, Duan; Rens, Johan; Botha, Gerhard; Desmet, Jan (IEEE, 2016)The quantification of harmonic emission requires an accurate model of the network harmonic impedances. A number of techniques have been proposed for the assessment of the network harmonic impedances to be practical and ... -
Modeling and validation of losses due to unbalanced loading of stand-alone generators
Debruyne, Colin; Rens, Johan; Sergeant, Peter; Desmet, Jan (IEEE, 2017)The goal of this paper is to evaluate the possibility of deriving a simple lumped electrical model of the additional losses in stand-alone synchronous generators due to unbalanced loading. An in depth analysis will reveal ... -
On the assessment of harmonic emission in distribution networks: opportunity for the prevailing harmonic phase angle
Peterson, Brandon; Rens, Johan; Botha, Gerhard; Meyer, Jan; Desmet, Jan (IEEE, 2016)Harmonic emission assessment for Grid Code compliance of Renewable Power Plants (RPP) has to be fair and pragmatic. The CIGRE C4.109 method lacks the ability to determine which harmonic currents have a positive or negative ...