Voltage-Current Ratio Difference Method: Recommended for IEEE Standard 1547 to Determine the Customer Harmonic Contribution

Safargholi, Farhad; Boroujeni, Kia Malekian; Santjer, Fritz

doi:10.1109/ichqp53011.2022.9808697

Cited by 1 publication

(2 citation statements)

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“…For instance, in [30], an approach based on extensive measurement campaigns at the lowvoltage level is presented for determining harmonic current limits between 2 and 9 kHz. The "Voltage-Current Ratio Difference Method" introduces a technique for identifying the relevant sources of harmonic currents [14,15]. The following analysis primarily focuses on previous studies regarding the application of impedance-based methods.…”

Section: Previous Applications Of Impedance-based Methodsmentioning

confidence: 99%

“…Methods such as the "Voltage-Current Ratio Difference Method" take a step further by enabling the attribution of both the cause of harmonic currents at the interconnection point of the system or the grid and the identification of dominant sources [14,15]. The procedure, however, relies further on the premise that the installation has already been constructed to consider coupling effects between units, thus rendering it unsuitable as a predictive method.…”

Section: Voltage Quality and Stabilitymentioning

confidence: 99%

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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: Previous Applications Of Impedance-based Methodsmentioning

confidence: 99%

Section: Voltage Quality and Stabilitymentioning

confidence: 99%