Abstract
Assessing high frequency (HF) distortion in power
systems is a new challenge in the framework of in-situ power
quality monitoring. The IEC suggests the use of a high-pass
filter in the measurement chain, which can be analog (with a
dedicated channel for HF assessment) or integrated in its digital
form into the signal processing stage, in order to reduce the
measurement uncertainty. This paper proposes a desynchronized
processing technique (DPT) as an effective alternative to the
other digital filtering techniques presented in literature allowing
also a potential measurement hardware simplification. The DPT
performance is analyzed by means of numerical experiments and
laboratory measurements performed using two different test beds
and both 16 and 24 bit analog to digital converters (ADCs). The
test beds are used to evaluate the combined contribution of the
ADC and the signal processing stage to the whole measurement
chain uncertainty and identify achievable accuracy levels for
different frequency ranges and magnitudes of HF distortion. The
results highlight the strengths of the DPT compared to other
techniques and demonstrates its potential to include HF in a
comprehensive waveform distortion assessment in power systems.
systems is a new challenge in the framework of in-situ power
quality monitoring. The IEC suggests the use of a high-pass
filter in the measurement chain, which can be analog (with a
dedicated channel for HF assessment) or integrated in its digital
form into the signal processing stage, in order to reduce the
measurement uncertainty. This paper proposes a desynchronized
processing technique (DPT) as an effective alternative to the
other digital filtering techniques presented in literature allowing
also a potential measurement hardware simplification. The DPT
performance is analyzed by means of numerical experiments and
laboratory measurements performed using two different test beds
and both 16 and 24 bit analog to digital converters (ADCs). The
test beds are used to evaluate the combined contribution of the
ADC and the signal processing stage to the whole measurement
chain uncertainty and identify achievable accuracy levels for
different frequency ranges and magnitudes of HF distortion. The
results highlight the strengths of the DPT compared to other
techniques and demonstrates its potential to include HF in a
comprehensive waveform distortion assessment in power systems.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Instrumentation and Measurement |
| DOIs | |
| Publication status | Published - 1 Apr 2019 |