Instrumentation for measurement of line impedance

Harris, Mark; Kelley, A.W.; Rhode, J.P.; Baran, Mesut

doi:10.1109/apec.1994.316304

Cited by 48 publications

(8 citation statements)

References 6 publications

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“…Various solutions for the measurement of spectral grid impedance were proposed in the literature, sometimes resulting in commercialized equipment. [2]- [5] However, at the start of our project, none was covering the whole frequency range between 2 and 150 kHz, which is in the scope of many standardization projects. This situation motivated us to develop the equipment described in this paper.…”

Section: Introductionmentioning

confidence: 98%

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On-line 2 to 150 kHz grid impedance meter

Roggo¹,

Merendaz²,

Furrer³

et al. 2013

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013)

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Active In-feed Converters (AIC) generate harmonics with frequencies up to 100 kHz resulting in power losses over the distribution lines, transformers and consumer loads, and interferences with control signals. The value of the harmonic voltage at an In-plant Point of Coupling (IPC) depends on the grid impedance at the harmonic frequency. As the spectral impedance of a distribution grid section cannot be estimated by calculation, it has to be measured. This paper presents the "on-line" grid impedance meter designed for spectral impedance measurements of low voltage distribution grids over the frequency range between 2 and 150 kHz. A useful application of spectral grid impedance measurement is presented at the end of this paper, with the analysis of interferences between two photovoltaic inverters.

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Section: Introductionmentioning

confidence: 98%

“…The data is processed at each tested frequency and the whole frequency domain scanning will take longer. This method is accurate and an exact selection of tested harmonics frequencies is possible [2]. [5] FFT can however be supplemented by more efficient data processing methods.…”

mentioning

confidence: 99%

On-line 2 to 150 kHz grid impedance meter

Roggo¹,

Merendaz²,

Furrer³

et al. 2013

22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013)

View full text Add to dashboard Cite

show abstract

“…Such methods usually require two or more sets of measurements for the voltage and current at the monitoring location [4]. In addition, one study introduced that the network impedance at the point of connection should be measured [5], using one of the methods described in previous studies [6,7]. The method of estimating the network impedance is still an important challenge, and discussion of this issue is beyond the scope of this paper.…”

Section: Network Impedance Modelmentioning

confidence: 99%

A New Assessment for the Total Harmonic Contributions at the Point of Common Coupling

Han¹,

Lee²,

Song³

et al. 2014

Journal of Electrical Engineering and Technology

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-A new method to determine the total harmonic contributions of several customers and the utility at the point of common coupling is presented. The proposed method can quantify the individual harmonic impact of each suspicious harmonic source at the point of common coupling. The individual harmonic impact index is then used to assess the total harmonic contribution of each harmonic source. This index can be calculated by the results processed from instantaneous harmonic voltage and current phasor values. The results demonstrate the performance of the proposed method in terms of steadystate accuracy and response to time-varying operating conditions. The proposed index can be used for billing purposes to control harmonic distortion levels in power systems.

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“…Although measurement of the line impedance is difficult, there are successful works on this problem [17,18] and its calculation and estimation can be found in [16]. Despite the analysis of this research focusing on VSC-based power generation units, the implementation is not limited to this class of DGs.…”

Section: Introductionmentioning

confidence: 99%

A power sharing control for microgrids based on extrapolation of injecting power and power-angle control

Janjornmanit¹,

Premrudeepreechacharn²

2017

Turk J Elec Eng & Comp Sci

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Droop controlled power sharing with an assumption that the value of line impedance is unavailable has been proven to have limitations; the power sharing is problematic in systems with significantly resistive lines. Furthermore, when the droop is applied in the islanding mode of operation of a microgrid, the system is likely to become unstable. In this paper, the droop control is replaced by an analytical solution. The proposed approach of power sharing is powerangle control of distributed generators (DGs), such as voltage source converters, a type of DG with extrapolation of power injected to the connected bus. It is demonstrated that the power injection to the bus could be tracked within the DG's capacity autonomously. Simulation and experimental results demonstrate the validity of the approach and it is shown that the proposed approach is suitable for DGs with either inductive or resistive line impedance. Moreover, this method can be operated in complex networks, such as meshed networks.

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Instrumentation for measurement of line impedance

Cited by 48 publications

References 6 publications

On-line 2 to 150 kHz grid impedance meter

On-line 2 to 150 kHz grid impedance meter

A New Assessment for the Total Harmonic Contributions at the Point of Common Coupling

A power sharing control for microgrids based on extrapolation of injecting power and power-angle control

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