Journal article Open Access

Online Estimation of Cable Harmonic Impedance in Low-Voltage Distribution Systems

Stanislav Babaev; Sjef Cobben; Vladimir Cuk; Helko van den Brom


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        <foaf:name>Helko van den Brom</foaf:name>
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    <dct:title>Online Estimation of Cable Harmonic Impedance in Low-Voltage Distribution Systems</dct:title>
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    <dcat:keyword>Impedance measurement, measurement techniques, measurement uncertainty, power quality, power system harmonics</dcat:keyword>
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        <foaf:name>European Commission</foaf:name>
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    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2019-07-03</dct:issued>
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    <dct:description>&lt;p&gt;Incorrect values of cable harmonic impedance can&lt;br&gt; lead to wrong conclusions when assessing an impact of current&lt;br&gt; distortion on the power network. A theoretical derivation&lt;br&gt; of resistance and reactance for harmonic frequencies is not&lt;br&gt; sufficient as it neglects operating conditions of cables as well&lt;br&gt; as their configuration and actual installation pattern. In this&lt;br&gt; paper, a noninvasive procedure for estimating parameters of the&lt;br&gt; low-voltage cable is proposed. On contrary to invasive methods,&lt;br&gt; the proposed technique does not require any external sources&lt;br&gt; of harmonic excitation, and consequently, it does not introduce&lt;br&gt; additional disturbances to the system. A disconnection of the&lt;br&gt; cable is not required as the procedure meant to be performed&lt;br&gt; online. The methodology employs natural variations of harmonic&lt;br&gt; currents and voltages; however, the impedance angle is preserved&lt;br&gt; due to the utilization of synchronized measurement samples. The&lt;br&gt; developed signal processing algorithm provides noise reduction&lt;br&gt; capabilities and smoothing of the output in presence of fluctuating&lt;br&gt; harmonics. In addition, an attention is given to the metrological&lt;br&gt; characterization of the measurement system and evaluation of&lt;br&gt; uncertainty of impedance values. The results of the laboratory&lt;br&gt; experiment indicate that for selective harmonics the variations&lt;br&gt; of impedance estimates are no more than 10 mOhm, which is in the&lt;br&gt; range of calculated uncertainty values. The practical applicability&lt;br&gt; of the method is discussed together with its limitations.&lt;/p&gt;</dct:description>
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