Experimental assessment of harmonic contributions using a ternary pulse sequence
Harmonic contributions of utility and customer may feature significant variations due to network switchings and changing operational modes. In order to correctly define the impacts on the grid voltage distortion the frequency dependent impedance characteristic of the studied network should...
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| Main Authors: | , |
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| Format: | article |
| Language: | EN |
| Published: |
Faculty of Technical Sciences in Cacak
2021
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| Subjects: | |
| Online Access: | https://doaj.org/article/bdfd607979ed4426aae20f7cdeacfb04 |
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| Summary: | Harmonic contributions of utility and customer may feature significant
variations due to network switchings and changing operational modes. In
order to correctly define the impacts on the grid voltage distortion the
frequency dependent impedance characteristic of the studied network should
be accurately measured in the real-time mode. This condition can be
fulfilled by designing a stimuli generator measuring the grid impedance as a
response to injected interference and producing time-frequency plots of
harmonic contributions during considered time interval. In this paper a
prototype of a stimuli generator based on programmable voltage source
inverter is developed and tested. The use of ternary pulse sequence allows
fast wide-band impedance measurements that meet the requirements of
real-time assessment of harmonic contributions. The accuracy of respective
analysis involving impedance determination and calculation of harmonic
contributions is validated experimentally using reference characteristics of
laboratory test set-up with varying grid impedance. |
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