Quantifying the impact of subperiodic loads on impedance characteristics
An approach for selecting suitable measurement methods
Translated title
Quantifizierung des Einflusses subperiodischer Lasten auf die Impedanzeigenschaften
Publication date
2025
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
ETG Kongress 2025 ; Kassel, Germany ; May 21–22, 2025
Project
ImaStabil
Publisher
VDE Verlag
Series or journal
ETG-Fachbericht
Periodical volume
176
Book title
ETG Kongress 2025
First page
418
Last page
425
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
Keyword
Measurement Methods
Field Measurements
Laboratory Measurements
Impedance Measurements
Laboratory Simulation
System Impedance
Excitation Method
Grid Impedance
Fourier Transform
System State
Time Domain
Resonance Frequency
Fast Fourier Transform
Series Of Measurements
Power Electronics
Small Window
Discrete Fourier Transform
Short-time Fourier Transform
Measurement Campaign
Clock Frequency
Pseudo-random Binary Sequence
Average Impedance
Fundamental Cycle
Sweep Method
Linear Time-invariant
Resonance Point
Parallel Resonance
Lower Graph
Mean Square Error
Abstract
Grid and system impedances are crucial inputs for the integration of renewables, evaluations of system stability and novel monitoring methods. They can be determined through various setups and excitation methods. However, the increasing use of grid-connected converters creates subperiodic effects, challenging the requirement of time-invariance in most an-alytical methodologies. This paper presents a novel indicator, the Subperiodic Impedance Variance (SIV), to quantify the impact of the time-variance of a given system. Laboratory measurements and simulations with different impedance meas-urement methods of systems with varying degrees of time-variance have been conducted to estimate provisional threshold values for the application of broadband excitation impedance measurements. Extensive field measurements were analyzed to determine real-world SIV values across various grid nodes.
Version
Published version
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