TY  - JOUR
AU  - Kušljević, Miodrag D.
AU  - Tomić, Josif J.
AU  - Poljak, Predrag
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4776
AB  - Recently, a multiple-resonator structure was proposed as a robust and computationally efficient tool for harmonic analysis. Two trivial cases have been previously observed. The first case exhibits good out-of-band suppression and elimination of unwanted harmonics, but with a high latency. In the second case, a phase frequency response around the passband centre is zero-flat, that provides fast estimates. However, in this case, resonant peaks at the ends of the passband and high interharmonic gains cause large overshoots. In general, the basic algorithm performance requirements: selectivity and speed, are contradictory which makes it impossible to completely fulfil both of them. In this paper, the Constrained Linear Least-Squares (CLLS) optimization method is used to obtain a compromise solution. As a result, the resonant peaks in the passband are avoided and side lobes are mitigated, simultaneously minimizing the group delay in the middle of the passband. Performed simulations confirmed the effectiveness of the proposed algorithm.
PB  - Slavonski Brod: Strojarski fakultet
T2  - Tehnički Vjesnik
T1  - Constrained-group-delay-optimized multiple-resonator-based harmonic analysis
VL  - 28
IS  - 4
SP  - 1244
EP  - 1252
DO  - 10.17559/TV-20180327173716
ER  - 

@article{
author = "Kušljević, Miodrag D. and Tomić, Josif J. and Poljak, Predrag",
year = "2021",
abstract = "Recently, a multiple-resonator structure was proposed as a robust and computationally efficient tool for harmonic analysis. Two trivial cases have been previously observed. The first case exhibits good out-of-band suppression and elimination of unwanted harmonics, but with a high latency. In the second case, a phase frequency response around the passband centre is zero-flat, that provides fast estimates. However, in this case, resonant peaks at the ends of the passband and high interharmonic gains cause large overshoots. In general, the basic algorithm performance requirements: selectivity and speed, are contradictory which makes it impossible to completely fulfil both of them. In this paper, the Constrained Linear Least-Squares (CLLS) optimization method is used to obtain a compromise solution. As a result, the resonant peaks in the passband are avoided and side lobes are mitigated, simultaneously minimizing the group delay in the middle of the passband. Performed simulations confirmed the effectiveness of the proposed algorithm.",
publisher = "Slavonski Brod: Strojarski fakultet",
journal = "Tehnički Vjesnik",
title = "Constrained-group-delay-optimized multiple-resonator-based harmonic analysis",
volume = "28",
number = "4",
pages = "1244-1252",
doi = "10.17559/TV-20180327173716"
}

Kušljević, M. D., Tomić, J. J.,& Poljak, P.. (2021). Constrained-group-delay-optimized multiple-resonator-based harmonic analysis. in Tehnički Vjesnik
Slavonski Brod: Strojarski fakultet., 28(4), 1244-1252.
https://doi.org/10.17559/TV-20180327173716

Kušljević MD, Tomić JJ, Poljak P. Constrained-group-delay-optimized multiple-resonator-based harmonic analysis. in Tehnički Vjesnik. 2021;28(4):1244-1252.
doi:10.17559/TV-20180327173716 .

Kušljević, Miodrag D., Tomić, Josif J., Poljak, Predrag, "Constrained-group-delay-optimized multiple-resonator-based harmonic analysis" in Tehnički Vjesnik, 28, no. 4 (2021):1244-1252,
https://doi.org/10.17559/TV-20180327173716 . .

TY  - JOUR
AU  - Kušljević, Miodrag D.
AU  - Tomić, Josif J.
AU  - Poljak, Predrag
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4694
AB  - This article deals with the implementation of the P-Class PMU compliant with IEC/IEEE
Standard 60255-118-1:2018 by usage of a multiple-resonator (MR)-based approach for harmonic
analysis having been proposed recently. In previously published articles, it has been shown that a
trade-off between opposite requirements is possible by shifting a measurement time stamp along the
filter window. Positioning the time stamp in a proximity of the time window center assures flat-top
frequency responses. In this article, through simulation tests carried out under various conditions, it
is shown that requirements of the IEC/IEEE Standard 60255-118-1:2018 can be satisfied by the second
and third order MR structure for particular conditions of the time stamp location.
PB  - MDPI
T2  - Energies
T1  - On Multiple-Resonator-based Implementation of IEC/IEEE Standard P-Class Compliant PMUs
VL  - 14
IS  - 1
SP  - 198
DO  - 10.3390/en14010198
ER  - 

@article{
author = "Kušljević, Miodrag D. and Tomić, Josif J. and Poljak, Predrag",
year = "2021",
abstract = "This article deals with the implementation of the P-Class PMU compliant with IEC/IEEE
Standard 60255-118-1:2018 by usage of a multiple-resonator (MR)-based approach for harmonic
analysis having been proposed recently. In previously published articles, it has been shown that a
trade-off between opposite requirements is possible by shifting a measurement time stamp along the
filter window. Positioning the time stamp in a proximity of the time window center assures flat-top
frequency responses. In this article, through simulation tests carried out under various conditions, it
is shown that requirements of the IEC/IEEE Standard 60255-118-1:2018 can be satisfied by the second
and third order MR structure for particular conditions of the time stamp location.",
publisher = "MDPI",
journal = "Energies",
title = "On Multiple-Resonator-based Implementation of IEC/IEEE Standard P-Class Compliant PMUs",
volume = "14",
number = "1",
pages = "198",
doi = "10.3390/en14010198"
}

Kušljević, M. D., Tomić, J. J.,& Poljak, P.. (2021). On Multiple-Resonator-based Implementation of IEC/IEEE Standard P-Class Compliant PMUs. in Energies
MDPI., 14(1), 198.
https://doi.org/10.3390/en14010198

Kušljević MD, Tomić JJ, Poljak P. On Multiple-Resonator-based Implementation of IEC/IEEE Standard P-Class Compliant PMUs. in Energies. 2021;14(1):198.
doi:10.3390/en14010198 .

Kušljević, Miodrag D., Tomić, Josif J., Poljak, Predrag, "On Multiple-Resonator-based Implementation of IEC/IEEE Standard P-Class Compliant PMUs" in Energies, 14, no. 1 (2021):198,
https://doi.org/10.3390/en14010198 . .

TY  - JOUR
AU  - Tomić, Josif J.
AU  - Poljak, Predrag
AU  - Kušljević, Miodrag D.
PY  - 2018
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2328
AB  - This Letter proposes a modified method for the dynamic harmonic analysis of signals with non-stationary harmonics, which is based on the previously proposed multiple-resonator observer structure. An optimisation technique is applied to reshape frequency responses of the basic transfer functions. This method, by using a parallel structure with common feedback, is very robust and, in addition, allows a reduction of the computational burden. The proposed method has been investigated for up to 64 harmonics, using LabView software package, under different conditions, and confirmed to be valuable and efficient tool for signal components estimation.
PB  - Hertford : The Institution of Engineering and Technology
T2  - Electronics Letters
T1  - Frequency-response-controlled multiple-resonator-based harmonic analysis
VL  - 54
IS  - 4
SP  - 202
EP  - 204
DO  - 10.1049/el.2017.4180
ER  - 

@article{
author = "Tomić, Josif J. and Poljak, Predrag and Kušljević, Miodrag D.",
year = "2018",
abstract = "This Letter proposes a modified method for the dynamic harmonic analysis of signals with non-stationary harmonics, which is based on the previously proposed multiple-resonator observer structure. An optimisation technique is applied to reshape frequency responses of the basic transfer functions. This method, by using a parallel structure with common feedback, is very robust and, in addition, allows a reduction of the computational burden. The proposed method has been investigated for up to 64 harmonics, using LabView software package, under different conditions, and confirmed to be valuable and efficient tool for signal components estimation.",
publisher = "Hertford : The Institution of Engineering and Technology",
journal = "Electronics Letters",
title = "Frequency-response-controlled multiple-resonator-based harmonic analysis",
volume = "54",
number = "4",
pages = "202-204",
doi = "10.1049/el.2017.4180"
}

Tomić, J. J., Poljak, P.,& Kušljević, M. D.. (2018). Frequency-response-controlled multiple-resonator-based harmonic analysis. in Electronics Letters
Hertford : The Institution of Engineering and Technology., 54(4), 202-204.
https://doi.org/10.1049/el.2017.4180

Tomić JJ, Poljak P, Kušljević MD. Frequency-response-controlled multiple-resonator-based harmonic analysis. in Electronics Letters. 2018;54(4):202-204.
doi:10.1049/el.2017.4180 .

Tomić, Josif J., Poljak, Predrag, Kušljević, Miodrag D., "Frequency-response-controlled multiple-resonator-based harmonic analysis" in Electronics Letters, 54, no. 4 (2018):202-204,
https://doi.org/10.1049/el.2017.4180 . .

TY  - JOUR
AU  - Kušljević, Miodrag D.
AU  - Tomić, Josif J.
AU  - Poljak, Predrag
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/2095
AB  - This paper presents an improved approach to the recently proposed multiple-resonator-based method for the harmonic analysis that has been provided in the previous papers. Previously, two inherent particular cases have been considered. In these cases, reference points in which estimation is performed are located either in the middle or at the end of the observation interval. The first case exhibits a good noises and unwanted harmonics attenuation but possesses a large delay time. In the second case, the filters are able to form a zero-flat phase response about the operation frequency and hence able to provide instantaneous estimates, but with large overshoots caused by resonant frequencies at the edges of the passband, and the high level of the sidelobes, that also makes it susceptible to interharmonics and noise interference. The aim of this paper is to propose a compromised solution provided by the tradeoff between those opposite requirements by shifting this point along the observation interval. This way the frequency responses of the estimator are reshaped. A maximally flatness of the frequency response in the operation harmonic frequency is kept in all cases, but only locating the reference point in a fraction around the center of the observation interval provides flat-top frequency responses. The effectiveness of the proposed estimation technique is shown through simulations.
PB  - Ieee-Inst Electrical Electronics Engineers Inc, Piscataway
T2  - IEEE Transactions on Instrumentation and Measurement
T1  - Maximally Flat-Frequency-Response Multiple-Resonator-Based Harmonic Analysis
VL  - 66
IS  - 12
SP  - 3387
EP  - 3398
DO  - 10.1109/TIM.2017.2751799
ER  - 

@article{
author = "Kušljević, Miodrag D. and Tomić, Josif J. and Poljak, Predrag",
year = "2017",
abstract = "This paper presents an improved approach to the recently proposed multiple-resonator-based method for the harmonic analysis that has been provided in the previous papers. Previously, two inherent particular cases have been considered. In these cases, reference points in which estimation is performed are located either in the middle or at the end of the observation interval. The first case exhibits a good noises and unwanted harmonics attenuation but possesses a large delay time. In the second case, the filters are able to form a zero-flat phase response about the operation frequency and hence able to provide instantaneous estimates, but with large overshoots caused by resonant frequencies at the edges of the passband, and the high level of the sidelobes, that also makes it susceptible to interharmonics and noise interference. The aim of this paper is to propose a compromised solution provided by the tradeoff between those opposite requirements by shifting this point along the observation interval. This way the frequency responses of the estimator are reshaped. A maximally flatness of the frequency response in the operation harmonic frequency is kept in all cases, but only locating the reference point in a fraction around the center of the observation interval provides flat-top frequency responses. The effectiveness of the proposed estimation technique is shown through simulations.",
publisher = "Ieee-Inst Electrical Electronics Engineers Inc, Piscataway",
journal = "IEEE Transactions on Instrumentation and Measurement",
title = "Maximally Flat-Frequency-Response Multiple-Resonator-Based Harmonic Analysis",
volume = "66",
number = "12",
pages = "3387-3398",
doi = "10.1109/TIM.2017.2751799"
}

Kušljević, M. D., Tomić, J. J.,& Poljak, P.. (2017). Maximally Flat-Frequency-Response Multiple-Resonator-Based Harmonic Analysis. in IEEE Transactions on Instrumentation and Measurement
Ieee-Inst Electrical Electronics Engineers Inc, Piscataway., 66(12), 3387-3398.
https://doi.org/10.1109/TIM.2017.2751799

Kušljević MD, Tomić JJ, Poljak P. Maximally Flat-Frequency-Response Multiple-Resonator-Based Harmonic Analysis. in IEEE Transactions on Instrumentation and Measurement. 2017;66(12):3387-3398.
doi:10.1109/TIM.2017.2751799 .

Kušljević, Miodrag D., Tomić, Josif J., Poljak, Predrag, "Maximally Flat-Frequency-Response Multiple-Resonator-Based Harmonic Analysis" in IEEE Transactions on Instrumentation and Measurement, 66, no. 12 (2017):3387-3398,
https://doi.org/10.1109/TIM.2017.2751799 . .