Additional Power Losses Under Non-Sinusoidal Conditions in a 22 kV Overhead Power Line
DOI:
https://doi.org/10.25729/esr.2024.01.0003Keywords:
power quality, harmonic, non-sinusoidal conditions, measurements, power system, frequency-controlled induction motorsAbstract
Non-sinusoidal conditions in the electrical networks cause active power losses at the fundamental frequency, corresponding to the first harmonic, and at harmonic frequencies, which are a multiple of the fundamental frequency. Non-sinusoidal currents flow through network components and create additional active power losses. One of the non-sinusoidal current sources is electronic equipment used in industrial plants to control process equipment. In Vietnam, coal mines use frequency-controlled induction motors when processing coal. The induction motors consume non-sinusoidal current, which creates additional active power losses in the supply network. The harmonic active power does not perform useful work. It causes economic damage to both the supply network and industrial enterprises. The power supply systems in industrial areas of Vietnam, where coal is mined, are characterized by low power quality. Companies engaged in coal mining and processing are forced to pay for additional losses of active power due to the low power quality under non-sinusoidal conditions, which reduces the economic efficiency of the companies' operations.
The paper presents a review of the literature on the assessment of additional active power losses in overhead power lines at harmonic frequencies. An example of calculating additional losses of harmonic active power is given for a 22 kV overhead power line, through which electrical energy is supplied to the coal grading plant of the Kua Ong-Vinacomin company. Additional losses are calculated using the measurements of harmonic voltage and current at the point of the supply network connection to the 22 kV overhead power line, through which electrical energy is supplied to the coal mine and the coal grading plant. To assess the influence of the electrical equipment of the coal grading plant on the power quality in the supply network, measurements were carried out on 0.4 kV buses of electrical substation of the coal mine.
References
L. I. Kovernikova, V.V. Sudnova, R.G. Shamonov et al. Power quality: current state, problems and proposals for solving them, N. I. Voropai, Ed. Novosibirsk, Russia: Nauka Publ., 2017, 219 p. (In Russian)
J. Arrillaga, D. Bradley, P. Bodger, Power System Harmonics. New York, USA: J. Wiley &Sons, 1985.
L. S. Czarnecki, “Working, reflected and detrimental active powers,” IET Generation, Transmission & Distribution, vol. 1, pp. 1–7, 2012.
I. V. Zhezhelenko, High harmonics in power supply systems of industrial enterprises, 6th ed. Moscow, Russia: Energoatomizdat, 2010, 375 p. (In Russian)
I. I. Kartashev, E. N. Zuev, Power quality in electricity systems. Ways to control and ensure it. Moscow, Russia: MPEI Publishing House, 2001, 120 p. (In Russian)
N. N. Kharlov, V. S. Borovikov, V. V. Litvak, A. V. Pogonin, V. A. Melnikov, “Energy survey of non-sinusoidal conditions of multi-wire power transmission lines,” Electrichestvo, no. 12, pp. 12–15, 2011. (In Russian)
H. De Keulenaer, “Power quality self-assessment guide,” Energy Conservation, no. 2, pp. 84–88, 2005. (In Russian)
A. E. Emanuel, Power definitions and the physical mechanism of power flow. Hoboken, New Jersey, USA: John Wiley & Sons, Ltd, 2010, 264 p.
A. K. Shidlovsky, V. G. Kuznetsov, Improving the quality of energy in electrical networks. Kyiv, Ukraina: Naukova Dumka Publ., 1985, 268 p. (In Russian)
I. V. Zhezhelenko, High harmonics in power supply systems of industrial enterprises, 3rd ed. Moscow, Russia: Energoatomizdat, 1994, 272 p. (In Russian)
A. Novitskiy, S. Schlegel, D. Westermann, “Estimation of Power Losses Caused by Supraharmonics,” Energy Systems Research, vol. 3, no. 4, pp. 28–36, 2022.
G. J. Wakileh, Power Systems Harmonics. Berlin Heidelberg, Germany: Springer, 2001, pp. 221.
O. N. Voitov, E. V. Popova, L. V. Semenova, “Algorithm for calculation of power flow in electrical networks,” Elektrichestvo, no. 12, pp. 19–26, 2013. (In Russian)
Circular of the Ministry of Industry and Trade of Vietnam No. 39/2015/ TT - BCT dated 11/18/2015 on electricity distribution system.
Circular of the Ministry of Industry and Trade of Vietnam No. 5/2016/ TT - BCT dated 30/11/2016 on electricity transmission system.
L. I. Kovernikova, H. N. Bui, O. N. Voitov, L. V. Semenova, “Optimization approach to determining the parameters of active filters,” in Methodological Problems in Reliability Study of Large Energy Systems. Reliability of Energy Supply to Consumers in the Context of Their Digitalization, issue 71, book 3. Irkutsk, Russia: ESI SB RAS, 2020, pp. 164-173. (In Russian)
L. I. Kovernikova, N. H. Bui, “Problems of power quality in power supply system of a coal grading plant at one of the coal mines in Vietnam,” Smart Electric Power Engineering, no. 2(10), pp. 4–16, 2020. DOI: 10.46960/2658-6754_2020_2_4. (In Russian)
Operating Manual Network Analyzer PQ-Box 150. Power Quality Evaluation Software. Available at: http://www.a-elerle.de.
Handbook on the design of electrical power systems, 2nd ed. rev., S. S. Rokotyan and I. M. Shapiro, Eds. Moscow, Russia: Energia Publ., 1977. (In Russian)
L. I. Kovernikova, V. C. Luong, “Algorithm for modeling nonlinear loads of a high-voltage network using measured parameters,” Elektrichestvo, no. 10, pp. 16–25, 2017. (In Russian)
J. O. Irwin, “On a criterion for the rejection of outlying observations,” Biometrika, vol. 17, no. 3–4, pp. 238–250, 1925.
L. R. Neiman, K. S. Demirchyan, Theoretical foundations of electrical engineering, vol.2. Leningrad, Russia: Energia Publ., 1967. (In Russian)
Downloads
Published
Issue
Section
License
Copyright (c) 2024 Energy Systems Research
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.