Harmonic Distortion Compensation in Voltage Transformers for Improved Power Quality Measurements

Faifer, Marco; Laurano, Christian; Ottoboni, R.; Toscani, Sergio; Zanoni, Michele

doi:10.1109/tim.2019.2906990

Cited by 58 publications

(53 citation statements)

References 19 publications

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“…A further simplification can be obtained by observing that, under these conditions, the strongest nonlinear effect is the harmonic distortion (HD) produced by the large fundamental term. From a different point of view, it corresponds to neglect the interactions between fundamental and harmonics: this permits developing very simple techniques [ 28 , 29 ] that allow retrieving the primary voltage spectrum from the secondary side by considering the effect of HD. In particular, the method proposed in [ 28 ] is based on polynomial modeling and compensation of the HD.…”

Section: Introductionmentioning

confidence: 99%

“…From a different point of view, it corresponds to neglect the interactions between fundamental and harmonics: this permits developing very simple techniques [ 28 , 29 ] that allow retrieving the primary voltage spectrum from the secondary side by considering the effect of HD. In particular, the method proposed in [ 28 ] is based on polynomial modeling and compensation of the HD. One of its main advantages lies in model structure, which permits adopting an LS-based preliminary identification procedure.…”

Section: Introductionmentioning

confidence: 99%

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A Simple Method for Compensating Harmonic Distortion in Current Transformers: Experimental Validation

Laurano

Toscani

Zanoni

2021

Sensors

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Conventional current transformers (CTs) suffer from nonlinearities due to their ferromagnetic cores. On one hand, it is well-known that severe core saturation may occur because of large overcurrents or unidirectional transient components: this may substantially impact the operation of relays. On the other hand, weaker nonlinear effects are also present during regular working conditions. In particular, the spectral content of typical current waveforms is characterized by a strong fundamental term responsible for harmonic distortion affecting the frequency components at the secondary side. In turn, this has a significant impact on the accuracy that can be reached as long as current harmonics must be monitored. The target of this work is implementing a simple signal processing technique that allows compensating for this effect. The method, characterized by extremely low computational complexity, is first introduced and validated using numerical simulations. After this, it was tested experimentally to improve the harmonic measurement capability of inductive CTs. The achieved results highlight a noticeable reduction of errors at low-order harmonics over a wide range of primary current amplitudes. It is worth noting that the black-box approach makes the technique suitable also for compensating nonlinearities introduced by current transducers based on different operating principles. Thanks to this peculiarity and to the low computational complexity, the proposed method is suitable to be employed in power quality analyzers and merging units. In this way, high-accuracy monitoring of current harmonics in power systems can be achieved, opening the way to advanced power quality management and to the location of disturbing users.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Simple Method for Compensating Harmonic Distortion in Current Transformers: Experimental Validation

Laurano

Toscani

Zanoni

2021

Sensors

Self Cite

View full text Add to dashboard Cite

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“…Therefore, it is necessary to have strong broadband measurement capabilities, DCTV should be able to measure superimposed ripple voltage, and provide measurement data for harmonic control of UHV DC transmission 8‐10 . Accurately obtaining the transmission characteristics of DCTV in the wide frequency domain will effectively improve the measurement accuracy of DCTV 11 …”

Section: Introductionmentioning

confidence: 99%

Wide frequency domain modeling method of DCTV based on rational function approximation

Zuo

Li²,

et al. 2021

Int Trans Electr Energ Syst

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Summary DC voltage transformer (DCTV) is an important device for measuring the voltage of ultra‐high voltage direct current (UHVDC) transmission system. Its characteristics of wide frequency transmission directly affect the accuracy of voltage measurement. In order to solve the problem of large harmonic voltage measurement errors caused by the inaccurate acquisition of the broadband transmission characteristics of DCTV, a new broadband modeling method for DCTV is proposed in this paper. This article proposes a new DCTV wide frequency domain modeling method without relying on DCTV parameters. The DCTV transfer function values at different frequencies are obtained by measurement, and the error function is constructed based on the rational approximation fitting principle. Then, the particle swarm optimization algorithm is used to iteration the error function to obtain the optimal solution and to fit the expression of transfer function. The accuracy of the algorithm is studied in different frequency sampling range (low frequency, intermediate frequency, and high frequency) and noise levels. Simulations based on actual DCTV parameters verify that the proposed method has a relative error of only 2.1908e‐16% within the 200th harmonic. It has strong anti‐noise ability and can control the error within 5% when the SNR of sampling value is greater than 1 dB.

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“…Measurement methods and systems for determining the transformation errors of current and voltage transformers based on various principles are described in the literature [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

3D Electromagnetic Field Analysis Applied to Evaluate the Accuracy of a Voltage Transformer under Distorted Voltage

2020

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Voltage transformers (VTs) are an important element of the measuring system that allows measuring the energy flow in medium and high voltage networks. Additional problems with the accuracy of the measurement introduced by the appearance of sources and nonlinear receivers cause deformation of the voltage shape in the energy system. Due to the high metrological requirements, the design of voltage transformers requires high accuracy (for class 0.2 ΔU ≤ 0.2, phase displacement ≤10 min), which is not possible with the use of analytical methods using approximate models. Therefore, only the application of numerical modeling by the finite element method, taking into account real three-dimensional phenomena, allows achieving high modeling accuracy. The article concerns the phenomenon of the influence of voltage higher harmonics of supply voltage on the accuracy (up to the 100th harmonic) of the measuring inductive voltage transformer (IVT). The applied modeling method takes into account the phenomena in the transformer core and the circuit equations resulting from the winding arrangement, which allows for the study of the deformation voltage transformation. Experimental tests on a real model to evaluate the method used were necessary. The article presents simulations for a model transformer, and results have been confirmed by experimental tests.

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Harmonic Distortion Compensation in Voltage Transformers for Improved Power Quality Measurements

Cited by 58 publications

References 19 publications

A Simple Method for Compensating Harmonic Distortion in Current Transformers: Experimental Validation

A Simple Method for Compensating Harmonic Distortion in Current Transformers: Experimental Validation

Wide frequency domain modeling method of DCTV based on rational function approximation

3D Electromagnetic Field Analysis Applied to Evaluate the Accuracy of a Voltage Transformer under Distorted Voltage

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