A method for in-situ measurement of grid impedance and load impedance at 2 k–150 kHz

Conference paper (2015)

Authors

Junzhe Tan External organisation
D. Zhao VSL Dutch Metrology Institute
Jan Abraham Ferreira Electrical Power Processing
Research Group
Electrical Power Processing
In-situ measurement Load impedance Electromagnetic interference (EMI) Grid impedance
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Published Date

2015

Language

English

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Research Group

Electrical Power Processing

Abstract

A new approach to measure the grid and load impedance of converters in-situ at frequency range 2k-150 kHz has been developed. It is called three-probe approach. This approach allows impedance measurements of power supplies and electric appliances without interrupting their normal operations. The measurement accuracy is improved by proper Fast Fourier Transform (FFT) process to obtain both amplitude and phase information in the measurement. With the proposed setup, the equivalent model consisting of both resistive and reactive components can be derived to represent the grid and load in this frequency range. Grid impedance at different locations and load impedance of various solid state lamps and a SMPS are measured and the results are shown in the paper.