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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    <subfield code="a">Impedance measurement, measurement techniques, measurement uncertainty, power quality, power system harmonics</subfield>
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    <subfield code="a">Sjef Cobben</subfield>
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    <subfield code="a">Vladimir Cuk</subfield>
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    <subfield code="a">Stanislav Babaev</subfield>
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    <subfield code="a">&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;</subfield>
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