The article devoted creating optimal conditions for the integration of renewable energy source (RES) into electric grids, which were designed with power from centralized generation at large power plants. The possibility of simultaneous optimal functioning of electric grids and renewable energy sources is considered. The complex criterion of optimality is the economic mode of power sources, as well as the minimum losses of electricity during its transmission. To optimize the regimes of electricity grids with renewable energy sources, the principle of the least action is used. Optimal control of modes is carried out by the active-adaptive system.
Słowa kluczowe: electric grid, local electric systems, renewable energy sources, automated system of optimal control, principle of least action.
W artykule analizowano optymalne warunki integracji do systemu energetycznego źródła energii odnawialnej. Zaproponowano metode symulacji uwzględniając warunki ekonomiczne i minimum strat przesyłowych. Do optymalizacji wykorzystano aktywny system adaptacyjny.
Keywords: lokalny system energetyczny, odnawialne źródło energii, optymalizacja
Electric grids were functionally designed to transport and distribute electricity produced centrally at large power plants. With the development of non-traditional and renewable energy sources (RES), they acquire the features of a local electric system (LES). In this connection, new tasks arise: harmonization of load schedules of consumers and generation of RES with consideration of their dependence on meteorological parameters of the environment, optimal control of power flows in order to reduce the losses of electricity and improve its quality, ensuring the balance power reliability of the formed LES centralized and local generation, etc. Naturally, it is advisable to solve these problems with the use of modern Smart Grid technologies [1-3]. Among the tasks to be solved for switching to the electrical grids (EG) based on the concept of the Smart Grid, there are, among other things, tasks whose solution is intended to improve the power flow control system [4, 5]. To do this, it is necessary to ensure the technical condition and regulatory capabilities of the relevant equipment. This, first and foremost, concerns the actual renewable energy sources (RES) - wind and solar power stations (WEP and PV), small hydroelectric power plants (SHPP), cogeneration and biogas plants (CGU and BGU) [4, 5]. This also applies to transformers and autotransformers with tap regulators, for which modern operational diagnostic systems should be created, as well as improved conditions for their operation in order to optimally utilize their load capacity to control power surges between higher and lower voltage grids  . At the same time it is necessary to improve the activeadaptive automatic control system (ACS) with power and voltage flows in electric grids of power systems, which allow to minimize power losses in them taking into account the technical state of electrical equipment of RES and the control effect of transformers with voltage and [...]
 Kobets B. B., Volkova I.O. Innovative development of electric power industry based on the concept of Smart Grid. - Moscow: IAC Energiya, 2010. - 208 p.  S. M. Canevese, A. Iar ia and M. R. Rapiz za, "Optimal Automatic Parameter Tuning for Innovative Grid Frequency Regulation Functions," 2018 AEIT International Annual Conference, Bari, Italy, 2018, pp. 1-6.do: 10.23919 / AEIT.2018.8577445  Feynman P. Quantum Electrodynamics. - 1962. Addison Wesley. ISBN 978-0-8053-2501-0.  Intelligent Electric Networks: Elements and Modes / Ed. O.V. Kyrylenko - K .: Institute of Electrodynamics of NAS of Ukraine, 2016. - 400 p.  M.A. Zehi r et al., "Managing Inverter-Based Distributed Energy Resources for Providing Voltage Regulatory Support in Icelandic Operation of Low Voltage Networks," 2018 53rd International University Power Engineering Conference (UPEC), Glasgow, 2018, pp. 1-5. doi: 10.1109/ UPEC.2018.8541988  P.D Lezhniuk ,. and I.O Hunko,. and S.V. Kravchuk , and P, Komada,. and K, Gromaszek,. and A, Mussabekova,. and N. A s karova, and A, Arman. “The influence of distributed power sources on active power loss in the microgrid", Przeglad Elektrotechniczny,2017,No.93,,p.107- 112 doi10.15199/48.2017. 03.25.  I. P. K rasnov , "On principle of the least action in classical electrodynamics," 2017 Progress In Electromagnetics Research Symposium - Spring (PIERS), St. Petersburg, 2017, pp.3532-3538. doi: 10.1109/PIERS.2017.8262371  Chaban A. Mathematical modeling of oscillatory processes in electromechanical systems: Monograph. - Lviv: Taras Soroka Publishing House, 2007. - 312 p.  The Law of Ukraine "On the Electricity Market" dated April 13, 2017, No. 2019-VIII. Access mode: http: //zakon5.rada.gov.ua/laws/show/2019  J. G. D. SF Junior, Y. Nishi tsuj i , Y. Udagawa, T. Oozeki and K. Ogimoto, "Improving Regional PV Power Curtailment with Better Day-ahead PV Forecasts: An Evaluation of 3 Forecasts," 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion ( WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC), Waikoloa Village, HI, 2018, pp. 2299-2304. do: 10.1109 / PVSC.2018.8548285  P. Lezhnyuk, V. Komar , S. Kravchuk, V. Lesko, V. Net rebski y, "Meteorological Parameters Analysis for the Hourly Forecast of Electricity Generation by Photovoltaic Power Station on the Day Ahead", 2018 IEEE 3rd International Conference on Intelligent Energy and Power Systems (IEPS), Kharkiv, Ukraine, 2018, pp. 235-238. DOI: 10.1109 / IEPS.2018.8559598.  Manual on the theory of automatic control, Ed. A.A Krasovskogo. -M .: Science. - 1987 - 712 p.  Lezhnyuk P.D., Kul yk V.V., Obolons kiy D.I. Design and indemnification of the influence of heterogeneity of electric networks on the economy of their modes // Elektrichestvo. - 2007. - No. 11. - PP. 2-8. (Rus.)  Veni kov V.A Theory of similarity and modeling. -M .: Higher school, 1976. - 479 p.  Lezhnyuk P.D., Kulyk V.V, Netrebsky V.V., Teptya V.V. Principle of the least action in electrical engineering and power engineering: Monograph. - Vinnitsa: VNTU, 2014 - 212 p.  Methods for Optimization of Power Systems Modes / V. M. Hornshtejn, B. P. Miroshnichenko, A. V. Ponomarev et al. - Moscow: Energoizdat, 1981. - 336 pp.