Measurement of network harmonic impedance in presence of electronic equipment

Stiegler, Robert; Meyer, Jan; Schegner, Peter; Chakravorty, Diptargha

doi:10.1109/amps.2015.7312737

Cited by 51 publications

(21 citation statements)

References 8 publications

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“…Some of these waveforms are suggested for testing in [2], but a more systematic specification might be needed in cases when tested PVInvs exhibit strong dependency of their characteristics on background distortion voltages. An example of a test with dynamic changes of SI indicated significant increase of harmonic and interharmonic emission (resulting in tripping of tested PVInv), suggesting that similar tests could be required in cases when PVInvs are sensitive and exposed to dynamic SI conditions during the operation, Additional impact of source impedance should be carefully considered both in the related tests (testing without impedance and with too high impedance may result in very different test evaluations) and in the related field studies (as source impedance values can vary widely in actual networks [29]).…”

Section: Viconclusionmentioning

confidence: 99%

Experimental-Based Evaluation of PV Inverter Harmonic and Interharmonic Distortion Due to Different Operating Conditions

Langella

Testa

Meyer

et al. 2016

IEEE Trans. Instrum. Meas.

123

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This paper presents the results of comprehensive testing, and subsequent detailed analysis of obtained test results, evaluating harmonic and interharmonic performance of PV inverters (PVInvs) for a range of different operating conditions. The presented results indicate significant power-dependent changes in harmonic and interharmonic emissions of tested PVInvs for different supply voltage conditions (presence of voltage waveform distortions and various source impedance values). To correctly quantify and describe these changes inPVInvs' performance, the paper discusses and applies measurement procedures and metrics for evaluating harmonic and interharmonic emission recommended in existing standards, as well as some additional metrics and indicators. For some operating conditions, tested PVInvs significantly increase both harmonic and interharmonic emission, and paper also discusses impact of PVInvs' controls (e.g. maximum power point tracking control) as a possible origin of the interharmonic distortion.

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Section: Viconclusionmentioning

confidence: 99%

Experimental-Based Evaluation of PV Inverter Harmonic and Interharmonic Distortion Due to Different Operating Conditions

Langella

Testa

Meyer

et al. 2016

IEEE Trans. Instrum. Meas.

123

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“…E.g. in an urban LV network with 400 household customers a first resonance as low as 500 Hz has been identified by measurements [14].…”

Section: Discussionmentioning

confidence: 99%

Impact of Modern Electronic Equipment on the Assessment of Network Harmonic Impedance

Chakravorty

Meyer

Schegner

et al. 2017

IEEE Trans. Smart Grid

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Abstract--Network harmonic impedance forms the link between harmonic currents emitted by individual devices and the harmonic voltage levels in the grid. It is essential for the definition of current emission limits in order to ensure Electromagnetic Compatibility between all equipment connected to the grid. Among all electrical equipment in future smart grid electronic devices, like PV inverters, EV chargers or lamps with electronic ballast, will have a dominating share. This is expected to have a considerable impact on the network harmonic impedance characteristic.The paper discusses the frequency-dependent input impedance of different types of modern electronic equipment and its potential impact on the network harmonic impedance. It is shown that the semiconductor switching results in a variation of the impedance within the fundamental cycle. This is not considered by the presently used assessment methods as they assume only passive network elements. Beside a method to measure these variations, several indices are introduced to quantify the level of its impact. The paper aims to provide some impulses for further discussions, particularly about the definition of network harmonic impedance in presence of electronic devices, the necessity to include these variations in realistic harmonic studies and if this has to be considered in the standardization.

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“…There are many methods for network harmonic impedance determination, which are presented in many literature works [6][7][8][9][10][11][12]. Even the operation of switching the capacitor bank can be used for harmonic impedance measuring [13], and online determination of the harmonic impedance is the subject of many works [14,15].…”

Section: Introductionmentioning

confidence: 99%

MatLab Simulink Modeling for Network-Harmonic Impedance Assessment: Useful Tool to Estimate Harmonics Amplification

Baloi¹,

Pană²

2018

MATLAB - Professional Applications in Power System

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The importance of the subject is given by the fact that harmonics are making their presence felt in electrical distribution networks, and the cheapest and most widespread solution for power factor correction is the capacitor banks. This chapter proves that the harmonic impedance is an efficient tool for assessing the state of distribution networks containing harmonics. The unfavorable operating conditions are anticipated based on the network harmonic impedance values, and the means of intervention are selected. Harmonic impedance monitoring and using it in expert systems for operating condition optimization will increase in the future. Power factor correction by shunt capacitor switching in electrical networks containing harmonics can lead to harmonics amplifications by harmonic voltage increasing and capacitors thermal overstressing by great values of the currents flowing through them. This chapter proposes a method for practical determination of harmonic impedance. Based on its values, a quick method is developed to anticipate the harmonic voltages and current amplifications that can occur when a shunt capacitor is installed for power factor correction. Amplification factors are calculated depending on the equivalent harmonic impedance of the network seen in the compensation bus. A distribution network containing harmonics is modeled using MatLab Simulink, and harmonic impedance is determined by simulation in different operating conditions. Using the values of the harmonic impedance and the capacitive reactance of the capacitor bank that is connected for power factor correction, the amplification of the harmonic voltages and currents is estimated by calculus. The results obtained by calculus are then compared with the values obtained by simulation after the connection of the capacitor bank to the network. In conclusion, the chapter proves that the network harmonic impedance is a useful tool to estimate the harmonics amplification caused by power factor correction using shunt capacitor banks.

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Measurement of network harmonic impedance in presence of electronic equipment

Cited by 51 publications

References 8 publications

Experimental-Based Evaluation of PV Inverter Harmonic and Interharmonic Distortion Due to Different Operating Conditions

Experimental-Based Evaluation of PV Inverter Harmonic and Interharmonic Distortion Due to Different Operating Conditions

Impact of Modern Electronic Equipment on the Assessment of Network Harmonic Impedance

MatLab Simulink Modeling for Network-Harmonic Impedance Assessment: Useful Tool to Estimate Harmonics Amplification

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