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Abstract

An analytical expression for the standard deviation of Total Harmonic Distortion (THD) estimation is derived. It applies to the case where the estimator uses sine fitting. It is shown that, in common circumstances, it is inversely proportional to the actual value of THD, the signal-to-noise ratio and the square root of the number of samples. The proposed expression is validated both with numerical simulations and an experimental setup using a Monte Carlo procedure.

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Authors and Affiliations

Francisco C. Alegria
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Abstract

The connection of renewable energy sources with significant nominal power (in the order of MW) to the medium-voltage distribution grid affects the operating conditions of that grid. Due to the increasing number of installed renewable energy sources and the limited transmission capacity of medium-voltage networks, the cooperation of these energy sources is becoming increasingly important. This article presents the results of a six-year study on a 2 MW wind power plant and a 1 MW photovoltaic power plant in the province of Warmia and Mazury, which are located a few kilometers away from each other. In this study, active energy, currents, voltages as well as active, reactive, and apparent power and higher harmonics of currents and voltages were measured. The obtained results show the parameters determining the power quality at different load levels. Long-term analysis of the operation of these power plants in terms of the generated electricity and active power transmitted to the power grid facilitated estimating the repeatability of active energy production and the active power generated in individual months of the year and times of day by a wind power plant and a photovoltaic power plant. It also allowed us to assess the options of cooperation between these energy sources. It is important, not only from a technical but also from an economic point of view, to determine the nominal power of individual power plants connected to the same connection point. Therefore, the cooperation of two such power plants with the same nominal power of 2 MW was analyzed and the economic losses caused by a reduction in electricity production resulting from connection capacity were estimated.
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Bibliography

  1.  C. Warren, “Feature — Wind, Sun, and Water,” EPRI Journal, no. 3, pp. 8–11, May/June 2016.
  2.  The Construction Law Act of 7 July 1994. Dz.U. 2019, item 1186.
  3.  The Energy Law Act of 10 April 1997. Dz.U. 1997, no. 54, item 348 as amended.
  4.  The Environmental Protection Law Act of 27 April 2001. Dz.U. 2001, no. 62, item 627.
  5.  The Act on Providing Information about the Environment and its Protection, Public Participation in the Environmental Protection and on Environmental Impact Assessment of 3 October 2008. Dz.U. 2008, no. 199, item 1227.
  6.  The Regulation of the Council of Ministers of 10 September 2019 on projects which may significantly affect the environment. Dz.U. 2019, item 1839.
  7.  The Act amending the Renewable Energy Sources Act and Some Other Acts of 7 June 2018, Dz.U. 2018, item 1276.
  8.  The Renewable Energy Sources Act of 20 February 2015. Dz.U. 2015, item 478 as amended.
  9.  H. Ritchie and M. Roser, “Renewable Energy.” [Online]. Available: https://ourworldindata.org/renewable-energy. [Accessed: 15 Nov. 2020].
  10.  G. Chicco, J. Schlabbach, and F. Spertino, “Characterisation and assessment of the harmonic emission of grid-connected photovoltaic systems,” in Proc. IEEE Russia Power Tech, 2005, pp.  1–7, doi: 10.1109/PTC.2005.4524744.
  11.  L. Liu, H. Li, Y. Xue, and W. Liu, “Reactive power compensation and optimization strategy for grid-interactive cascaded photovoltaic systems,” IEEE Trans. Power Electron., vol. 30, no. 1, pp. 188–202, 2015, doi: 10.1109/TPEL.2014.2333004.
  12.  S. Mishra and P.K. Ray, “Power quality improvement using photovoltaic fed DSTATCOM based on JAYA optimization,” IEEE Trans. Sustain. Energy, vol. 7, no. 4, pp. 1672–1680, 2016, doi: 10.1109/TSTE.2016.2570256.
  13.  A. Lange and M. Pasko, “Selected aspects of photovoltaic power station operation in the power system,” Przegląd Elektrotechniczny, vol. 96, no. 5, pp. 30–34, 2020, doi: 10.15199/48.2020.05.05.
  14.  H. Serghine, R. Merahi, R. Chenni, and D. Buła, “Combined operation of photovoltaic and active power filter system connected to nonlinear load,” Roum. Sci. Techn. Électrotechn. Énerg., vol. 64, no. 4, pp. 371–376, 2019, doi: https://www.researchgate.net/publication/342079034.
  15.  N. Mansouri, A. Lashab, D. Sera, J.M. Guerrero, and A. Cherif, “Large photovoltaic power plants integration: A review of challenges and solutions,” Energies, vol. 12, no. 19, pp. 3798, 2019, doi: 10.3390/en12193798.
  16.  J. Smith, S. Rönnberg, M. Bollen, J. Meyer, A.M. Blanco, K.-L. Koo, and D. Mushamalirwa, “Power quality aspects of solar power – results from CIGRE JWG C4/C6.29,” CIRED – Open Access Proceedings Journal, 2017, pp. 809–813, 2017, doi: 10.1049/oap-cired.2017.0351.
  17.  J. Meyer, A. M. Blanco, S. Rönnberg, M. Bollen, and J. Smith, “CIGRE C4/C6.29: survey of utilities experiences on power quality issues related to solar power,” CIRED – Open Access Proceedings Journal, 2017, pp. 539–543, doi: 10.1049/oap-cired.2017.0456.
  18.  Z. Chen and E. Spooner, “Grid power quality with variable speed wind turbines,” IEEE Trans. Energy Convers., vol. 16, no. 2, pp. 148–154, 2001, doi: 10.1109/60.921466.
  19.  A. Lange and M. Pasko, “Selected aspects of wind power plant operation in the power system,” in Proc. 12th Int. Conf. and Exhibition on Electrical Power Quality and Utilisation (EPQU), 2020, pp. 1–4, doi: 10.1109/EPQU50182.2020.9220302.
  20.  M. Mróz, K. Chmielowiec, and Z. Hanzelka, “Voltage fluctuations in networks with distributed power sources,” in Proc. 15th Int. Conf. on Harmonics and Quality of Power (ICHQP), 2012, pp.  920–925, doi: 10.1109/ICHQP.2012.6381206.
  21.  M. Farhoodnea, A. Mohamed, H. Shareef, and H. Zayandehroodi, “Power quality impact of renewable energy based generators and electric vehicles on distribution systems,” Procedia Technology, vol. 11, pp. 11–17, 2013, doi: 10.1016/j.protcy.2013.12.156.
  22.  N. Golovanov, G.C. Lazaroiu, M. Roscia, and D. Zaninelli, “Power quality assessment in small scale renewable energy sources supplying distribution systems,” Energies, vol. 6, no. 2, pp.  634–645, 2013, doi: 10.3390/en6020634.
  23.  A. Merzic, M. Music, and M. Redzic, “A complementary hybrid system for electricity generation based on solar and wind energy taking into account local consumption – Case study,” in Proc. 3rd Int. Conf. on Electric Power and Energy Conversion Systems, 2013, pp.  1–6, doi: 10.1109/EPECS.2013.6712993.
  24.  R.N.S.R. Mukhtaruddin, H.A. Rahman, and M.O.J. Hassan, “Economic analysis of grid-connected hybrid photovoltaic-wind system in Malaysia,” in Proc. Int. Conf. on Clean Electrical Power (ICCEP), 2013, pp. 577–583, doi: 10.1109/ICCEP.2013.6586912.
  25.  K. Benyahia, L. Boumediene, and A. Mezouar, “Efficiency and performance of mixed wind farm using photovoltaic solar farm as STATCOM,” in Proc. 3rd Int. Renewable and Sustainable Energy Conference (IRSEC), 2015, pp. 1–5, doi: 10.1109/IRSEC.2015.7455092.
  26.  Ö. Kiymaz and T. Yavuz, “Wind power electrical systems integration and technical and economic analysis of hybrid wind power plants,” in Proc. IEEE International Conference on Renewable Energy Research and Applications (ICRERA), 2016, pp. 158–163, doi: 10.1109/ ICRERA.2016.7884529.
  27.  C. Wang, S. Liu, Z. Bie, and J. Wang, “Renewable Energy Accommodation Capability Evaluation of Power System with Wind Power and Photovoltaic Integration,” IFAC-PapersOnLine, vol. 51, no. 28, pp.  55–60, 2018, doi: 10.1016/j.ifacol.2018.11.677.
  28.  M. Bollen, J. Meyer, H. Amaris, A.M. Blanco, A.G. de Castro, J. Desmet, M. Klatt, Ł. Kocewiak, S. Rönnberg, and K. Yang, “Future work on harmonics – some expert opinions Part I – wind and solar power,” Proc. of 16th International Conference on Harmonics and Quality of Power (ICHQP), 2014, pp. 904–908, doi: 10.1109/ICHQP.2014.6842870.
  29.  S.K. Rönnberg, K. Yang, M.H.J. Bollen, and A. Gil de Castro, “Waveform distortion – a comparison of photovoltaic and wind power,” Proc. of 16th International Conf. on Harmonics and Quality of Power (ICHQP), 2014, pp. 733–737, doi: 10.1109/ICHQP.2014.6842782.
  30.  O. Lennerhag, M. Bollen, S. Ackeby, and S. Rönnberg, “Very short variations in voltage (timescale less than 10 minutes) due to variations in wind and solar power,” Proc. of International Conference and Exhibition on Electricity Distribution, CIRED, 2015, pp. 1–5.
  31.  A. Zomers and R. Seethapathy, “The potential of hybrid systems for off-grid power supply,” ELECTRA, no. 289, Report WG C6.28, pp. 23–27, 2016.
  32.  D. Heide, L. von Bremen, M. Greiner, C. Hoffmann, M. Speckmann, and S. Bofinger, “Seasonal optimal mix of wind and solar power in a future, highly renewable Europe,” Renew. Energy, vol.  35, no. 11, pp. 2483–2489, 2010, doi: 10.1016/j.renene.2010.03.012.
  33.  L. Hirth, “The optimal share of variable renewables: How the variability of wind and solar power affects their welfare-optimal deployment,” The Energy Journal, vol. 9, no. 1, pp.  149–184, 2015, doi: 10.2139/ssrn.2351754.
  34.  W. Ningbo, “The key technology of the control system of wind farm and photovoltaic power plant cluster,” in Proc. IEEE International Conference on Power System Technology, 2014, pp.  2833–2839, doi: 10.1109/POWERCON.2014.6993817.
  35.  S.S. Singh, E. Fernandez, and T.Ksh. Tompok Singh, “Reliable PV/Wind renewable energy mix for a remote area,” in Proc. Annual IEEE India Conference (INDICON), 2015, pp. 1–5, doi: 10.1109/INDICON.2015.7443419.
  36.  Y. Zhang, L. Wei, and J. Li, “Study on renewable energy integration influence and accommodation capability in regional power grid,” in Proc. 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2015, pp. 563–568, doi: 10.1109/DRPT.2015.7432292.
  37.  L.R.A. Gabriel Filho, O.J. Seraphim, F.L. Caneppele, C.P.C. Gabriel, and F.F. Putti, “Variable analysis in wind photovoltaic hybrid systems in rural energization,” IEEE Latin America Transactions, vol. 14, no. 12, pp. 4757–4761, 2016, doi: 10.1109/TLA.2016.7817007.
  38.  Y. Shuo, B. Hongkun, W. Jiangbo, Y. Meng, M. Renyuan, and Y. Jing, “Accommodated capacity for wind and solar power under the background of supply side reform: Model and empirical study,” in Proc. 2nd International Conference on Power and Renewable Energy (ICPRE), 2017, pp.  382–386, doi: 10.1109/ICPRE.2017.8390563.
  39.  D.B. Carvalho, E.C. Guardia, and J.W. Marangon Lima, “Technical-economic analysis of the insertion of PV power into a wind-solar hybrid system,” Solar Energy, vol. 191, pp.  530–539, 2019, doi: 10.1016/j.solener.2019.06.070.
  40.  A. Thomas and P. Racherla, “Constructing statutory energy goal compliant wind and solar PV infrastructure pathways,” Renewable Energy, vol. 161, pp. 1–19, 2020, doi: 10.1016/j.renene.2020.06.141.
  41.  Z. Hanzelka and A. Firlit. Elektrownie ze źródłami odnawialnymi. Zagadnienia wybrane. Kraków: AGH, 2015, pp. 459–484.
  42.  K. Mousa, H. AlZu’bi, and A. Diabat, “Design of a hybrid solar-wind power plant using optimization,” in Proc. 2nd International Conference on Engineering System Management and Applications (ICESMA), 2010, pp. 1–6.
  43.  J. Jurasz and J. Mikulik, “Economic and environmental analysis of a hybrid solar, wind and pumped storage hydroelectric energy source: a Polish perspective,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 65, no. 6, pp. 859–869, 2017, doi: 10.1515/bpasts-2017-0093.
  44.  P. Marchel, J. Paska, K. Pawlak, and K. Zagrajek, “A practical approach to optimal strategies of electricity contracting from Hybrid Power Sources,” Bull. Polish Acad. Sci. Tech. Sci., vol. 68, no. 6, pp. 1543–1551, 2020, doi: 10.24425/bpasts.2020.135377.
  45.  R. Al Badwawi, M. Abusara, and T. Mallick, “A review of hybrid solar PV and wind energy system,” Smart Science, vol. 3, no.  3, pp. 127–138, 2015, doi: 10.1080/23080477.2015.11665647.
  46.  F.A. Khan, N. Pal, and S.H. Saeed, “Review of solar photovoltaic and wind hybrid energy systems for sizing strategies optimization techniques and cost analysis methodologies,” Renewable and Sustainable Energy Reviews, vol. 92, pp. 937–947, 2018, doi: 10.1016/j. rser.2018.04.107.
  47.  K. Sood and E. Muthusamy, “A comprehensive review on hybrid renewable energy systems,” Modern Physics Letters B, vol. 34, no.  27, pp. 2050290, 2020, doi: 10.1142/S0217984920502905.
  48.  Commission Regulation (EU) 2016/631 of 14 April 2016 establishing a network code on requirements for grid connection of generators.
  49.  International Electrotechnical Commission (IEC). Electromagnetic compatibility (EMC). Testing and measurement techniques – Power quality measurement methods (IEC 61000-4-30:2015). IEC: Geneva, Switzerland, 2015.
  50.  International Electrotechnical Commission (IEC). Electromagnetic compatibility (EMC). Power quality measurement in power supply systems – Part 2: Functional tests and uncertainty requirements (IEC 62586-2:2017). IEC: Geneva, Switzerland, 2017.
  51.  International Electrotechnical Commission (IEC). Electromagnetic compatibility (EMC). Testing and measurement techniques – General guide on harmonics and interharmonics measurements and instrumentation, for power supply systems and equipment connected thereto (IEC 61000-4-7: 2002 + AMD1: 2008 CSV). IEC: Geneva, Switzerland, 2009.
  52.  D. Buła, D. Grabowski, A. Lange, M. Maciążek, and M. Pasko, “Long- and Short-Term Comparative Analysis of Renewable Energy Sources,” Energies, vol. 13, no. 14, pp. 3610, 2020, doi: 10.3390/en13143610.
  53.  International Electrotechnical Commission (IEC). Recommendations for small renewable energy and hybrid systems for rural electrification – Part 7‒1: Generators – Photovoltaic generators (IEC TS 62257-7-1:2010). IEC: Geneva, Switzerland, 2010.
  54.  International Electrotechnical Commission (IEC). Electromagnetic compatibility (EMC) – Part 3‒6: Limits – Assessment of emission limits for the connection of distorting installations to MV, HV and EHV power systems (IEC TR 61000-3-6:2008). IEC: Geneva, Switzerland, 2008.
  55.  European Committee for Electrotechnical Standardization. Standard EN 50160:2010: Voltage Characteristics of Electricity Supplied by Public Distribution Systems; CENELEC: Brussels, Belgium, 2010.
  56.  International Electrotechnical Commission (IEC). Wind energy generation systems – Part 21‒1: Measurement and assessment of electrical characteristics – Wind turbines (IEC 61400-21-1:2019). IEC: Geneva, Switzerland, 2019.
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Authors and Affiliations

Andrzej Lange
1
ORCID: ORCID
Marian Pasko
2
Dariusz Grabowski
2
ORCID: ORCID

  1. Department of Electrical and Power Engineering, Electronics and Automation, University of Warmia and Mazury, ul. M. Oczapowskiego 11, 10-719 Olsztyn, Poland
  2. Department of Electrical Engineering and Computer Science, Silesian University of Technology, ul. Akademicka 10, 44-100 Gliwice, Poland
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Abstract

Along with the increase in the use of nonlinear electronic devices, e.g. personal computers, power tools and other electrical appliances, the requirements for uninterruptible power supplies are constantly growing. This paper proposes a method and deep analysis of results viable for checking how single-phase uninterruptible power supplies (UPSs) cope with nonlinear circuits under varying power loads in terms of electric energy quality.Various classes of single-phase UPS systems with different topologies were tested, for instance line-interactive and double conversion (online) single-phase UPS devices. Furthermore, measurements were carried out in view of a power source – loads were supplied both from a power grid and UPS built-in battery. Juxtaposition of the obtained results such as a THDU, THDI (Total Harmonic Distortion) percentage ratio of input/output voltage and current, a power factor and crest factor volume etc. of the tested UPS systems indicated major differences in their performance during laboratory tests.

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Authors and Affiliations

Michał Szulborski
Łukasz Kolimas
Sebastian Łapczyński
Przemysław Szczęśniak
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Abstract

In this paper we introduce a self-tuning Kalman filter for fast time-domain amplitude estimation of noisy harmonic signals with non-stationary amplitude and harmonic distortion, which is the problem of a contactvoltage measurement to which we apply the proposed method. The research method is based on the self-tuning of the Kalman filter's dropping-off behavior. The optimal performance (in terms of accuracy and fast response) is achieved by detecting the jump of the amplitude based on statistical tests of the innovation vector of the Kalman filter and reacting to this jump by adjusting the values of the covariance matrix of the state vector. The method's optimal configuration of the parameters was chosen using a statistical power analysis. Experimental results show that the proposed method outperforms competing methods in terms of speed and accuracy of the jump detection and amplitude estimation.

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Authors and Affiliations

Uroš Kovač
Andrej Košir
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Abstract

The quality of the supplied power by electricity utilities is regulated and of concern to the end user. Power quality disturbances include interruptions, sags, swells, transients and harmonic distortion. The instruments used to measure these disturbances have to satisfy minimum requirements set by international standards. In this paper, an analysis of multi-harmonic least-squares fitting algorithms applied to total harmonic distortion (THD) estimation is presented. The results from the different least-squares algorithms are compared with the results from the discrete Fourier transform (DFT) algorithm. The algorithms are assessed in the different testing states required by the standards.

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Authors and Affiliations

Pedro Ramos
Fernando Janeiro
Tomáš Radil
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Abstract

The electrical grid integration takes great attention because of the increasing population in the nonlinear load connected to the power distribution system. This manuscript deals with the power quality issues and mitigations associated with the electrical grid. The proposed single comprehensive artificial neural network (SCANN) controller with unified power quality conditioner (UPQC) is modelled in MATLAB Simulink environment. It provides series and shunt compensation that helps mitigate voltage and current distortion at the end of the distribution system. Initially, four proportional integral (PI) controllers are used to control the UPQC. Later the trained SCANN controller replaces four PI Controllers for better control action. PI and SCANN controllers’ simulation results are compared to find the optimal solutions. A prototype model of SCANN controller is constructed and tested. The test results show that the SCANN based UPQC maintains grid voltage and current magnitude within permissible limits under fluctuating conditions.
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Authors and Affiliations

Varadharajan Balaji
1
Subramanian Chitra
2

  1. Department of Electrical and Electronics Engineering, Kumaraguru College of Technology, Coimbatore, Tamilnadu – 641049, India and Research Scholar (Electrical), Anna University, Chennai, Tamilnadu, India
  2. Department of Electrical and Electronics Engineering, Government College of Technology, Coimbatore, Tamilnadu – 641049, India
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Abstract

This paper describes a three phase shunt active power filter with selective harmonics elimination. The control algorithm is based on a digital filter bank. The moving Discrete Fourier Transformation is used as an analysis filter bank. The correctness of the algorithm has been verified by simulation and experimental research. The paper includes exemplary results of current waveforms and their spectra from a three phase active power filter.
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Authors and Affiliations

Krzysztof Sozański
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Abstract

In order to ensure that all the connected Equipment in the distribution network operates smoothly, the voltage stability of photovoltaic (PV) integrated distribution systems is very important. Sustaining the voltage profile when integrating PV is a particularly difficult issue. The primary goal of this article is to provide a consistent voltage profile to a sensitive load. A three-phase PV integrated distribution system has been chosen for investigation. An innovative feature of this system is that UPQC DVR and STATCOM systems are powered by Z-source inverters instead of traditional inverters. The ability to actively decouple power is the primary benefit of utilizing a Z-source inverter. The objective of the study effort is to use this new UPQC to synchronize a solar PV system with the distribution system. For the UPQC with battery energy storage system (BESS), the research study examines and develops the most appropriate control approach. A UPQC is a device that is used to integrate solar panels and improve the voltage stability of the distribution system. The prototype model is being developed, and the experimental findings confirm the main objective.
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Authors and Affiliations

A. Raja
1
M. Vijayakumar
2
C. Karthikeyan
3

  1. Electrical and Electronics Engineering Department, SSM College of Engineering, Kumarapalayam, Namakkal – 638 183, Tamilnadu, India
  2. Electrical and Electronics Engineering Department, K.S.R. College of Engineering, Tiruchengode, Namakkal-637 215, Tamilnadu, India
  3. Electrical Department, Tamil Nadu Generation and Distribution Corporation Ltd., Erode – 638009, Tamilnadu, India

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