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Number of results: 5
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Abstract

The paper presents a new method for simultaneous tracking of varying grid impedance and its uncertainty bounds. Impedance tracking consists of two stages. In the first stage, the actual noise estimate is obtained from least squares (LS) residua. In the second stage, the noise covariance matrix is approximated with the use of residual information. Then weighted least squares (WLS) method is applied in order to estimate impedance and background voltage. Finally uncertainty bounds for impedance estimation are computed. The robustness of the method has been verified using simulated signals. The proposed method has been compared to sliding LS. The results have shown, that the method performs much better than the LS for all considered cases, even in the presence of significant background voltage variations.

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Authors and Affiliations

Dariusz Borkowski
Szymon Barczentewicz
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Abstract

Growing popularity of distributed generation is drawing special attention to communication technologies in smart power grids. This paper provides a detailed overview of the communication protocols utilized in the modern distributed grid laboratory. It describes both wired and wireless technologies used in Smart Grid and presents the remote operation of switching the subsystem from grid mode to island mode operating under nominal conditions. It shows the duration of power outages during a transfer to island mode with diesel generator running on idle - which simulates planned islanding and diesel generator stationary, which simulates unplanned islanding. Latency between registration of disturbance and executing control command is measured. The results obtained are compared with current legislation. The consequences to the power system that are possible in both scenarios are highlighted. Obtained results and description of the communication technologies can be useful for the design of distributed power grids, island-mode power grids, and Smart Grids, as well as for further research in the area of using combustion fuel generators as a primary power supply in the microgrid.
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Authors and Affiliations

Kamil Prokop
1
Andrzej Bień
1
Szymon Barczentewicz
1

  1. AGH University of Science and Technology, Kraków, Poland
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Abstract

Power quality (PQ) monitoring is important for both the utilities and also the users of electric power. The most widespread measurement instrument used for PQ monitoring is the PQM (Power Quality Monitor) or PQA (Power Quality Analyzer). In this paper we propose the usage of PMU data for PQ parameters monitoring. We present a new methodology of PQ parameters monitoring and classification based on PMU data. The proposed methodology is tested with real measurements performed in distribution system using dedicated PMU system.

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Authors and Affiliations

Szymon H. Barczentewicz
Andrzej Bień
Krzysztof Duda
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Abstract

The paper presents the propagation assessment and power quality parameters improvement system in power distribution grid. In this work main functionalities of the system are described focusing on the individual assessment module. The module is using CIRED/CIGRE C4.109 method which is based on the 10-minutes aggregated data. Three cases of individual emission assessment using real measurement data in the distribution system operator environment ware analyzed. The obtained results confirmed the legitimacy of using 10-minute data to assess the emissions of harmonics.
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Authors and Affiliations

Szymon Barczentewicz
1
Tomasz Rodziewicz
2
Andrzej Bień
1
Andrzej Firlit
1

  1. AGH University of Science and Technology, Poland
  2. TAURON Dystrybucja S.A., Poland
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Abstract

Unintentional islanding detection is one the mandatory criterion that must be met by PV inverters before connecting them into the grid. Acceptable time for inverter for islanding detection is less than 2 seconds. In this paper voltage parameters after islanding occurrence and before turning off the inverter are analyzed. In order to simulate islanding state and perform measurements the testing system was build. Three different commercial PV inverters were tested. Measured signals were used to calculate voltage envelope, phasor, frequency and ROCOF. Collected data proved to be helpful to compere different inverters.
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Bibliography

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[2] IEEE Standard for Synchrophasor Measurements for Power Systems—Amendment 1: Modification of Selected Performance Requirements, IEEE Standard C37.118.1a, Apr. 2014.
[3] International Standard Synchrophasor for power systems – Measurements, IEC/IEEE 60255-118-1, Edition 1.0, Dec. 2018.
[4] G. A. Dileep, “Survey on smart grid technologies and applications”, Renewable Energy, vol. 146, pp. 2589-2625, 2020, https://doi.org/10.1016/j.renene.2019.08.092
[5] S. Barczentewicz, T. Lerch, A. Bień, K. Duda, “Laboratory Evaluation of a Phasor-Based Islanding Detection Method”. Energies. 2021; 14(7):1953. https://doi.org/10.3390/en14071953
[6] IEEE 15471-2020 „Standard Conformance Test Procedures for Equipment Interconnecting Distributed Energy Resources with Electric Power Systems and Associated Interfaces”
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[8] Z. Lin, T. Xia, Y. Ye, Y. Zhang, L. Chen, Y. Liu, K. Tomsovic, T. Bilke, F. Wen, “Application of wide area measurement systems to islanding detection of bulk power systems.” IEEE Trans. Power Syst. 2013, 28, 2006–2015, https://doi.org/10.1109/TPWRS.2013.2250531
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[13] D. Sivadas, K. Vasudevan, “An Active Islanding Detection Strategy with Zero Non detection Zone for Operation in Single and Multiple Inverter Mode Using GPS Synchronized Pattern.” IEEE Trans. Ind. Electron. 2020, 67, 5554–5564, https://doi.org/10.1109/TIE.2019.2931231
[14] M. Ropp, E. Aaker, K. Haigh, J. Sabbah, “Using power line carrier communication to prevent islanding”. IEEE Photovolt. Spec. Conf. 2002, 1675–1678, https://doi.org/10.1109/PVSC.2000.916224
[15] X. Wilson, Z. Guibin, L. Chun, W. Wencong, W. Guangzhu, K. A Jacek, “Power line signaling based technique for anti-islanding protection of distributed generators-Part I: Sheme and analysis.”, IEEE Trans. Power Deliv. 2007, 22, 1758–1766, https://doi.org/10.1109/TPWRD.2007.899618
[16] Z. Ye, R. Walling, L. Garces, R. Zhou, L. Li, T. Wang, “Study and Development of Anti-Islanding Control. for Grid-Connected Inverters”; Nat. Renew. Energy Lab.: Golden, CO, USA, May 2004, NREL/ SR-560-36243.
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Authors and Affiliations

Szymon Henryk Barczentewicz
1
Tomasz Lerch
1
ORCID: ORCID
Andrzej Bień
1

  1. AGH University of Science and Technology, Poland

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