Automatic control of electrical distribution network mode with the voltage unbalance

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Authors:

P.H.Plieshkov, Cand. Sc. (Tech.), Prof., orcid.org/0000-0003-2141-4811, Central Ukrainian National Technical University. Kropyvnytskyi, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V.V.Zinzura, Cand. Sc. (Tech.), orcid.org/0000-0001-6357-064X, Central Ukrainian National Technical University. Kropyvnytskyi, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S.P.Plieshkov, Cand. Sc. (Tech.), orcid.org/0000-0002-3120-5397, Central Ukrainian National Technical University. Kropyvnytskyi, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Enhancement of the efficiency of the electrical distribution networks with rated voltage of up to 1 kV by improving automatic control systems for the parameters of the mode of electrical distribution networks with symmetrical compensating devices under conditions of voltages unbalance.

Methodology. Multicriterion optimization methods were used in solving the problem of controlling the parameters of the mode of electrical distribution networks. The Nelder-Mead numerical optimization method was used to find the final solution of the problem of multicriteria optimization. Using the methods of computer simulation, the efficiency of the automatic control system proposed in the work was evaluated.

Findings. The advantage of the proposed method for controlling the parameters of the mode of electrical distribution networks with symmetric compensating devices over existing ones is proved, because additional criteria, levels of steady stress deviation, are taken into account in the formulation of the control task. The results of computer simulation of the automatic control system, based on the method proposed in the paper, confirmed the results of theoretical studies: the developed automatic control system, in contrast to existing ones, performs such control actions, at which the levels of asymmetry and steady-state stress deviations are observed which do not exceed normally admissible ones.

Originality. For the first time, the solutions of the multicriteria optimization problem were obtained by the method of approaching the Utopian point in the space of criteria for determining the rules for automatic phase-by-phase variation of the reactance of symmetric compensating devices, the application of which allows simultaneous reduction of consumption levels of reactive capacity, asymmetry levels and steady-state voltage deviations in electrical distribution networks with a nominal voltage of up to 1 kV.

Practical value. The computer model of the automatic control system of the parameters of the mode of electrical distribution networks with a nominal voltage of up to 1 kV gives possibility to analyze the modes of these networks using it. Also, with the help of this computer model, the process of setting up a microprocessor automatic control system is essentially simplified - based on the method of automatic control of the parameters of the mode of electrical distribution networks proposed in the work.

References.

1. Buslavets, O. A., Burykin, O. B., & Lezhnyuk, P. D. (2016). The impact of transit overflows of power on losses in the power grids. Tekhnichna Elektrodynamika, 4, 71-73.

2.Lezhnyuk, P. D., Rubanenko, A. E., &  Kylymchuk, A. V.(2014). Minimization of additional losses of electricity in electric networks by means of cross transformers. Enerhetyka: ekonomika, tekhnolohii, ekolohiia, 3, 7-14.

3. Sotnik, O. V. (2016). Analysis of technical metods for reduction loses of electricity in rual electric networks 0.4 kV. Visnyk KhNTUSGh im. P. Vasylenka. Tekhnichni nauky, 175, 151-152.

4. Furman, I. O., & Miroshnyk, O. O. (2015). Assessment of inhomogeneous modes and loss of electric energy in power supply systems. Visnyk KhNTUSGh im. P. Vasylenka. Tekhnichni nauky, 164, 14-15.

5. Popova, I. O., Nesterchuk, D. M., & Popriadu­khin, V. S. (2017). Analysis of the influence of asymmetric loads on the modes of operation of a three-phase asynchronous electric motor. Visnyk KhNTUSGh im. P. Vasylenka. Tekhnichni nauky, 13, 85-87.

6. Stiopin, Yu. O., Borokhov, I. V., & Perova, N. P. (2015). Estimation of loss of power of asynchronous electric motors at voltage unbalance. Pratsi Tavriiskoho derzhavnoho ahrotehnolohichnoho universytetu: naukove fakhove vydannia, 15, 323-327.

7. Saienko, Yu. L., & Kaliuzhnyi, D. M. (2017). A general mathematical model for the distribution of actual contributions to distortion of symmetry and deviation of voltage at the point of general accession. Visnyk Vinnytskoho politekhnichnoho instytutu, 6, 80-85.

8. Saienko, Yu., & Kaliuzhnyi, D. M. (2015). Analytical methods for determination of the factual contributions impact of the objects connected to power system on the distortion of symmetry and sinusoidal waveform of voltages. Przegląd elektrotechniczny, 15, 81-85.

9. Zinzura, V. V. (2012). Methods of multi-objective optimization solution for the problem of voltage regulation in electrical networks. Zbirnyk naukovykh prats Kirovohradskoho natsionalnoho tekhnichnoho Universytetu. Tekhnika v silskohospodarskomu vyrobnytstvi, haluzeve mashynobuduvannia, avtomatyzatsiia, 25(1), 350-360.

10. Taranukha, M. S., Teliuta, R. V., & Zinzura, V. V. (2015). Optimal control regimes reactive load conditions asymmetry voltage electrical distribution networks. Visnyk Natsionalnoho tekhnichnoho universytetu Kharkivskyi politekhnichnyi instytut. Zbirnyk naukovykh prats. Tematychnyi vypusk: Problemy udoskonalennia elektrychnykh mashyn i aparativ. Teoriia i praktyka, 42, 62-66.

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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

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