The most recent IEC standards about voltage transformers warn about nonlinearity, which may significantly impact the harmonic measurement performance. However, there is a lack of scientific literature about this topic: usually their characterization consists of frequency response measurements that are clearly not able to capture the nonlinear behavior. In this paper, an innovative approach based on recently developed simplified frequency-domain polynomial models is proposed. The method is applied to two different medium-voltage inductive transformers. Models are identified and validated with a large set of realistic primary waveforms injected by a proper setup. Experimental results confirm the remarkable accuracy of the proposed models especially for low-order harmonics, which are the most affected by nonlinearity.

Overcoming Frequency Response Measurements of Voltage Transformers: An Approach Based on Quasi-Sinusoidal Volterra Models

Faifer M.;Laurano C.;Ottoboni R.;Toscani S.;Zanoni M.;
2019-01-01

Abstract

The most recent IEC standards about voltage transformers warn about nonlinearity, which may significantly impact the harmonic measurement performance. However, there is a lack of scientific literature about this topic: usually their characterization consists of frequency response measurements that are clearly not able to capture the nonlinear behavior. In this paper, an innovative approach based on recently developed simplified frequency-domain polynomial models is proposed. The method is applied to two different medium-voltage inductive transformers. Models are identified and validated with a large set of realistic primary waveforms injected by a proper setup. Experimental results confirm the remarkable accuracy of the proposed models especially for low-order harmonics, which are the most affected by nonlinearity.
2019
ELETTRICI
Frequency response; Frequency-domain analysis; frequency-domain analysis; Harmonic analysis; harmonic distortion; Instrument transformers; instrument transformers; intermodulation distortion; nonlinear distortion; nonlinear systems; Pollution measurement; power quality (PQ); Power system harmonics; power system harmonics; Voltage measurement; voltage measurement.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1098043
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