An Innovative Calibration Scheme for Interharmonic Analyzers in Power Systems under Asynchronous Sampling

Guo, Qiang; Wu, Jing; Haibin, Jin; Cheng, Peng

doi:10.3390/en12010121

Cited by 5 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The asynchronous sampling and the quasi-synchronous sampling do not require the sampling rate to be an integer multiple of the signal frequency. When the discrete Fourier transform (DFT) is used to analyze the voltage and current signals sampled by these two sampling methods, it is difficult to accurately calculate the power quality parameters like inter-harmonics and harmonics because of the spectrum leakage and the fence effect (Zhou et al, 2018;Guo et al, 2019). Meanwhile, it is pointed out in the literature (Kuwalek and Otomański, 2019) that the calculation error of the total harmonic distortion (ΔTHD) can reach 4% due to the influence of spectral leakage and fence effect.…”

Section: Introductionmentioning

confidence: 99%

“…The synchronous sampling method (Aiello et al, 2007;Jain and Singh, 2011) requires the sampling rate to be an integer multiple of the signal frequency. In theory, this integer cycle sampling of the voltage and current signal realized by the synchronous sampling method can avoid the adverse effects of spectral leakage on the calculation of power parameters (Guo et al, 2019). Song and Yang (2014) studied the harmonic analysis algorithm based on the synchronous sampling architecture.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A High-Precision and Wideband Fundamental Frequency Measurement Method for Synchronous Sampling Used in the Power Analyzer

et al. 2021

View full text Add to dashboard Cite

In the dedicated high-precision power quality analyzer, synchronous sampling is required to reduce the effect of spectrum leakage produced by the discrete Fourier transform process. Thus, accurate fundamental frequency measurement is urgently needed. However, due to the harmonics and noise in the power signal, it is difficult to achieve the accurate fundamental frequency measurement. Moreover, with the wide application of high-frequency programmable power supply, the fundamental frequency is gradually increasing, which requires power analyzers to have the abilities of both high precision and a wide range of the fundamental frequency measurement. To solve these issues, a new fundamental frequency measurement architecture used in synchronous sampling is proposed. This architecture consists of a small-point fast Fourier transform module, spectrum refinement algorithm, and a multimodal optimization method to calculate the accurate fundamental frequency under large harmonic conditions. In the practical hardware platform results, this architecture has a large fundamental frequency measurement range from 20 Hz to 200 kHz with a relative error which is <0.004%. The wideband fundamental frequency measurement structure proposed in this article achieves high measurement accuracy.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A High-Precision and Wideband Fundamental Frequency Measurement Method for Synchronous Sampling Used in the Power Analyzer

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In most cases, the calibration efficiency is not high enough; thus, the calibration workload is relatively large. To solve this problem, a calibration algorithm based on discrete Fourier transform (DFT) is provided in paper [17,18]. This method directly carries on the Fourier transform processing to the sampled data sequence, which has the advantages of fast operation speed and less computation.…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Calibration Method Based on Sinusoidal Excitation and DFT Transformation for High‐Precision Power Analyzers

et al. 2021

View full text Add to dashboard Cite

For most high-precision power analyzers, the measurement accuracy may be affected due to the nonlinear relationship between the input and output signal. Therefore, calibration before measurement is important to ensure accuracy. However, the traditional calibration methods usually have complicated structures, cumbersome calibration process, and difficult selection of calibration points, which is not suitable for situations with many measurement points. To solve these issues, a nonlinear calibration method based on sinusoidal excitation and DFT transformation is proposed in this paper. By obtaining the effective value data of the current sinusoidal excitation from the calibration source, the accurate calibration process can be done, and the calibration efficiency can be improved effectively. Firstly, through Fourier transform, the phase value at the initial moment of the fundamental frequency is calculated. Then, the mapping relationship between the sampling value and the theoretical calculation value is established according to the obtained theoretical discrete expression, and a cubic spline interpolation method is used to further reduce the calibration error. Simulations and experiments show that the calibration method presented in this paper achieves high calibration accuracy, and the results are compensation value after calibration with a deviation of ± 3 × 10 − 4 .

show abstract

“…Typical requirements for the sensors are a simple structure, wide bandwidth, reliability, low-Temperature Coefficient of Resistance (TCR), low self-heating, and robustness in sensing environment. In the case of transducers, is required a high precision interface insensitive to load and excellent stability from DC to kHz range [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Design of a 1 ampere high-precision thin-film resistive current transducer with negligible frequency dependence from DC to 100 KHz

et al. 2020

View full text Add to dashboard Cite

Currently, non-linear loads are found virtually anywhere with the promise of high electrical efficiency. Examples of this type of non-linear loads are compact fluorescent lamps and light-emitting diode lamps which can now be found in any home. However, they produce highly distorted currents that pollute the power grid and cause stability problems, and making the measurement of the distorted electrical current a non-trivial issue. For the reliable measurement of distorted waveforms within a wide bandwidth, magnetic current transducers present disadvantages over resistive current transducers, such as those caused by the magnetic material which attenuates the high-frequency components while producing heating on the magnetic material. This research presents the design principles to develop a thin-film wideband current transducer. Principles such as the selection of high-purity materials, high-symmetry coaxial design, size, geometry, and aspect ratios were used to obtain a linear relationship between its input and output, i.e.: a flat frequency response from DC to 100 kHz, and the ability to operate continuously with a custom passive thermal system for heat dissipation and reliable measurement. An exhaustive effort has been made on the refinement of the design aimed at understanding the effects that govern the frequency behavior of the transducer and the ways to compensate them. The manufacturing feasibility of the proposed design is well confirmed by the results obtained from the simulation process.

show abstract

An Innovative Calibration Scheme for Interharmonic Analyzers in Power Systems under Asynchronous Sampling

Cited by 5 publications

References 22 publications

A High-Precision and Wideband Fundamental Frequency Measurement Method for Synchronous Sampling Used in the Power Analyzer

A High-Precision and Wideband Fundamental Frequency Measurement Method for Synchronous Sampling Used in the Power Analyzer

A Nonlinear Calibration Method Based on Sinusoidal Excitation and DFT Transformation for High‐Precision Power Analyzers

Design of a 1 ampere high-precision thin-film resistive current transducer with negligible frequency dependence from DC to 100 KHz

Contact Info

Product

Resources

About