Abstract
The influence of the inverter system operating in the system of a solar power station (SPS) on the power quality indicators and the influence of the regime parameters of the network on the inverter operation is estimated. The following power quality indicators were measured: frequency deviation, slow voltage change and auxiliary parameters (active and reactive power, frequency, current and voltage waveforms) at the point of connection of a 54 kW solar power station to a 0.4 kV (the supply line) power supply system of a medical institution. An algorithm for analyzing the impact of inverter operation with a driven network has been developed. The operating modes of the inverter system of solar power stations, where Japanese-made inverters of the Omron brand are installed, are considered using the example of the SPS of the Research Institute of Obstetrics, Gynecology and Perinatology in Dushanbe. The influence of the inverter operation on the power quality in distributed networks of 0.4 kV was considered. The results of measuring the indicators of the power quality and auxiliary parameters at the considered power factory are evaluated. The operating modes of the inverter system were analyzed for 7 days. In idle mode, the reactive power consumption of the inverter system from the grid is up to 5% of the installed power. When the inverter system is fully loaded, the reactive power consumed increase up to 15%, relative to the converted active power. When the value of the frequency and voltage of the network goes beyond the established corridor (± 0.4 Hz) for frequency and voltage (± 10%), the inverter system disconnects the SPS from the network. A method for choosing compensating devices, depending on the load of inverters, is proposed.
Keywords
solar power station, measurements, inverter, distribution networks, controlled network, supply line, frequency deviation, voltage deviation, active and reactive power
1. Shohzoda B.T., Dzhuraev Sh.Dj. Solar Energy Potential Study in Tajikistan. Politekhnicheskiy vestnik. Seriya: Inzhenernye issledovaniya [Polytechnic bulletin. Series: Engineering studies], 2019, no. 1(45), pp. 27-35. (In Russian)
2. Rapid Assessment and Gap Analysis brief summary 2011. Ministry of Energy and Water Resources of Tajikistan. 35 p. Available at: https://www.mewr.tj (accessed 14 November 2022)
3. Shohzoda B.T., Nazirov Kh.B., Karimov D.Kh., Majidov A.Sh. Cellular base station powered by solar energy. Vestnik Tajikskogo tekhnicheskogo universiteta [Tajik Technical University bulletin], 2015, no. 4 (32), pp. 57-61. (In Russian)
4. Nazirov K.B., Shvedov G.V., Chorshanbiev S.R., Dzhuraev S.D. Study of the operating modes of the 0.4 kV main distribution network, in Dushanbe city of the Republic of Tajikistan, with distributed solar generation for power losses and power quality estimation. Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus). IEEE, 2018, pp. 737-742. doi: 10.1109/EIConRus.2018.8317197
5. Tulsky V.N., Nazirov Kh.B. Studies of the influence of voltage regulation on consumption and losses of electricity in distribution networks of 10-0.4 kV. Vestnik Tajikskogo tekhnicheskogo universiteta [Tajik Technical University bulletin], 2012, no. 3(19), pp. 57–61. (In Russian)
6. Bubenchikov A.A., Nurakhmet E.E., Molodykh V.O., Rudenok A.I. Solar energy as a source of electrical energy. Mezhdunarodnyi nauchno-issledovatelskiy zhurnal [International research journal], 2016, no. 5 (47), pp. 51–53. doi: 10.18454/IRJ.2016.47.288 (In Russian)
7. Toshiro H., Hirofumi M., Yoichi I. Development of an independent type of hybrid power generation system. 31st International Telecommunications Energy Conference (INTELEC). IEEE, 2009, pp. 1-5. doi: 10.1109/INTLEC.2009.5351763
8. Islam Wani N.U., Bakhsh F.I., Choudekar P., Ruchira. Active Power Control of Grid Connected SPV Plant Based Microgrid Using Active Power Regulating Schem. Emerging Trends in Industry 4.0 (ETI 4.0). IEEE, 2021, pp. 1-6. doi: 10.1109/ETI4.051663.2021.9619213
9. Dasheev S.S., Malyshev E.A. Solar energy: state and prospects. Vestnik nauki i obrazovaniya [Bulletin of science and education], 2018, no. 17 (53), pp. 51–53. (In Russian)
10. Venkatasamy B., Kalaivani Dr.L., Prakash P.R., Prabhu S., Mathana B. Gopal Performance Analysis of Grid-Tie Inverter for Reactive Power Injection Mode in Hybrid Wind Solar Energy System. 2nd International Conference on Trends in Electronics and Informatics (ICOEI). IEEE, 2018. pp. 652-656. doi: 10.1109/ICOEI.2018.8553869.
11. Liu Y., Zhang L., Zhao D., Wang D., Zhang H. Study on Control Characteristic of Grid-connected Solar Photovoltaic Plant Based on Simulation. 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT). IEEE, 2015, pp. 1-6. doi: 10.1109/DRPT.2015.7432558
12. Mohanty B.P., Srivalli M. Optimization and Design of Grid Connected Rooftop Solar Power Plant under Various Operating Conditions. International Conference on Computational Intelligence for Smart Power System and Sustainable Energy (CISPSSE). IEEE, 2015, pp. 1954-1958. doi: 10.1109/CISPSSE49931.2020.9212254
13. Pal D., Bajpai P. Active and Reactive Power Control in Three Phase Solar PV Inverter using Modified IC Method. 21st Century Energy Needs – Materials, Systems and Applications (ICTFCEN). IEEE, 2016, pp. 1-6. doi: 10.1109/ICTFCEN.2016.8052727
14. State Standard 32144-2013. Electric energy. Electromagnetic compatibility of technical equipment. Power quality limits in the public power supply systems. Moscow, STANDARTINFORM Publ., 2014. 16 p. (In Russian).
Nazirov Kh.B., Abdulkerimov S.A., Ganiev Z.S., Juraev Sh. D., Akheev J.S. Inverter Operating Mode Evaluation of Solar Power Plants from the Power Quality Viewpoint. Elektrotekhnicheskie sistemy i kompleksy [Electrotechnical Systems and Complexes], 2023, no. 1(58), pp. 31-38. (In Russian). https://doi.org/10.18503/2311-8318-2023-1(58)-31-38