Online Network Impedance Spectrometer for the Medium-Voltage Level

Jordan, Michael Guilherme; Grumm, Florian; Kaatz, Gesa; Meyer, Marc Florian; Wilken, Hauke; Schulz, Detlef

doi:10.1109/eeeic.2018.8494432

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…Conductor impedances and the symmetrical components are subsequently calculated based on a matrix equation system from three independent measurements. This process assumes the time invariance of the DUT during the measurement of loop impedances [49]. The differential impedance spectroscopy method determines the effective frequencydependent impedance as well as the internal harmonic voltage sources of an inverter [17].…”

Section: Figure 2 Schematic Representation Of the Mobile Measurement ...mentioning

confidence: 99%

Impedance-Based Method for Predictive Stability Assessment

Schräder,

Kaiser,

Jordan

et al. 2024

Proc Tagung Zukünftige Stromnetze | Future Power Grids Conf

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Impedance-based analysis methods enable a more specific and earlier foundation for assessing harmonic stability in decentralized converter-based power plants compared to the conventional compliance testing in the grid connection process. Essentially, they can be implemented as black-box model approaches without the necessity to disclose internal control models. Initially, only knowledge of the input impedances of the planned grid connection point and the planned PV system is required for application. For this purpose, the method of impedance spectroscopy for inverters has already been developed as a means to determine the effective impedance profile and the internal harmonic sources of inverters, allowing for the description of the frequency-dependent behavior of individual units. The time- and frequency-dependent grid impedance at the grid connection point (GCP) has also been successfully measured in several campaigns on medium and low-voltage grids. Through the coordinated application of both measurement methods, a predictive harmonic assessment is intended in the future, ensuring high planning reliability and grid quality even in grids with a high penetration of power electronics-coupled systems. This paper provides an overview of the current state of research on impedance-based stability criteria and presents measurement methods for practical implementation. Furthermore, it outlines remaining open questions until application in the field.

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Section: Figure 2 Schematic Representation Of the Mobile Measurement ...mentioning

confidence: 99%

Impedance-Based Method for Predictive Stability Assessment

Schräder,

Kaiser,

Jordan

et al. 2024

Proc Tagung Zukünftige Stromnetze | Future Power Grids Conf

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“…) This minimum impedance requires the maximum current injection to achieve a voltage excitation of 1 % and is calculated in (5). The final specifications are adapted to 0.55 % grid excitation, corresponding to 1 % grid excitation for short-circuit powers up to minimum 275 MVA.…”

Section: Medium-voltage Gridmentioning

confidence: 99%

“…The main goal of this application is the determination of the grid impedance depending on the frequency, also varying with the time due to changing conditions. Different to the analysis at LV grids [1,2,3], measurements and analysis for MV grids are very scarce [4,5]. However, the effectiveness of grid services can be enhanced a lot by proper knowledge and analysis of the grid characteristics.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of a Medium-Voltage Grid Analyzer

Hahn

Buticchi²,

Teodorescu³

et al. 2019

2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)

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Much research has been done for medium-voltage applications, where multilevel inverters are challenging classical low-voltage inverters, connected by transformers. Although the decision is very crucial for system costs and performance, comparisons of both approaches are missing, being now introduced for the application of a medium-voltage grid analyzer.This paper provides a general design approach for classical and advanced solution and further comparisons to support the choice of the optimal solution.

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“…The so-called PECs are usually self-controlled pulse width modulation (PWM) power converters that connect generators or loads to the 50 Hz power supply system. For the power-quality analysis or a filter design of the converters detailed knowledge is required of the frequency characteristics of the network impedance at a specific grid-connection point [3]. Along with the increasing number of PECs especially in low and medium voltage grids, the generated, and transferred amount of data rises massively.…”

Section: Introductionmentioning

confidence: 99%

Impact of Lossy Compression Techniques on the Impedance Determination

et al. 2020

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One of the essential parameters to measure the stability and power-quality of an energy grid is the network impedance. Including distinct resonances which may also vary over time due to changing load or generation conditions in a network, the frequency characteristic of the impedance is an import part to analyse. The determination and analysis of the impedance go hand in hand with a massive amount of data output. The reduction of this high-resolution voltage and current datasets, while maintaining the fidelity of important information, is the main focus of this paper. The presented approach takes measured impedance datasets and a set of lossy compression procedures, to monitor the performance success with known key metrics. Afterwards, it continually compares the results of various lossy compression techniques. The innovative contribution is the combination of new and existing procedures as well as metrics in one approach, to reduce the size of the impedance datasets for the first time. The approach needs to be efficient, suitable, and exact, otherwise the decompression results are useless.

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Online Network Impedance Spectrometer for the Medium-Voltage Level

Cited by 4 publications

References 14 publications

Impedance-Based Method for Predictive Stability Assessment

Impedance-Based Method for Predictive Stability Assessment

Optimal Design of a Medium-Voltage Grid Analyzer

Impact of Lossy Compression Techniques on the Impedance Determination

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