Abstract
The industrial static var compensator reacting power reserve assessment methodology for balancing internal voltage sags is developed in this paper. This methodology makes it possible to determine the average value of the compensated voltage sag based on the available source data on the power supply system (PSS) and the parameters of the electrical receiver loads. The experimental data on voltage sags at the metallurgical enterprise CJSC «MMK Metalurji» in Iskenderun, Turkey, is used as initial information. The effect of voltage sags on the sensitive electric receivers, such as frequency converters (FC) with active rectifiers (AR) reliability, is examined on the basis of this enterprise. The methodology for voltage sags compensation through the use of powerful SVC reserves of electric arc furnaces (EAF) is proposed. The results obtained allowed us to introduce the concept of damping coefficient, which is defined as the average relative deviation between the required reactive power at single-phase and three-phase voltage sags. A mathematical analysis of the SVC required reactive power on the magnitude of the voltage sags dependence is carried out. This analysis makes it possible to develop a new approach in the design of intra-shop power supply systems. The results obtained are of great practical importance for compact metallurgical enterprises, including electric steelmaking and rolling production.
Keywords
Electric arc furnace, static var compensator, voltage sag, reactive power compensation, power quality.
1. GOST 32144-2013. Electric energy. Electromagnetic compatibility of technical equipment. Power quality limits in the public power supply systems. Moscow: Standartinform, 2014. (In Russian)
2. NikolaevA.A., Kornilov G.P., Khramshin T.R., Ackay I., Gok Y. Application of static var compensator of ultra-high power electric arc furnace for voltage drops compensation in factory power supply system of metallurgical enterprises // Proceedings of the Electrical Power and Energy Conference EPEC-2014 – Calgary, Canada, 12-14 November 2014. pp. 235-241.
3. Nikolaev А.А., Denisevich А.S., Lozkhkin I.А., Tukhvatullin М.М. Investigation of Voltage Drops Influence in the Power Supply System of the "MMK Metalurji" Ironworks on the Main Electric Drives of the Hot Strip Mill // Elektrotekhnicheskie sistemy i kompleksy [Electrotechnical Systems and Complexes], 2015. No 3(28). P. 8-14. (In Russian)
4. Nikolaev А.А., Denisevich А.S., Bulanov М.V. Investigation of the parallel operation of automated electric drives of a rolling mill and an electric arc furnace // Vestnik IGJeU [Journal of ISPU], 2017. No 3. P. 59-69. (In Russian)
5. Nikolaev А.А., Lozkhkin I.А., Ivekeev V.S. Improvement of dynamic indicators Static Var Compensator of the Ultra-High Power Electric Arc Furnace in the mode of damping of the voltage drops arising in an external power line // Materialy XLV mezhdunarodnoy nauchno-prakticheskoy konferentsii «Fodorovskiye chteniya» [Materials of the XLV International Scientific and Practical Conference "Fedorov Readings"]. 2015. P. 198-201. (In Russian)
6. Nikolaev А.А., Ivekeev V.S., Lozkhkin I.А. Analysis of voltage fall in 380 kV regional electrical power networks of Hatay and Adana provinces, Turkey // Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G.I. Nosova [Journal of MSTU], 2018. No 1. P. 61-70.
7. Nikolaev A.A., Kornilov G.P., Ivekeev V.S., Lozhkin I.A., Kotyishev V.E. Using of the Static Var Compensator of the Ultra-High Power Electric Arc Furnace for Supporting of Electrical Power System’s Stability and Increasing Reliability of Factory Power Supply. Mashinostroenie setevoj ehlektronnyj nauchnyj zhurnal [Russian Internet Journal of Industrial Engineering], 2014. No.1, P. 1-11. (In Russian)
8. Telny S.I. To the theory of a three-phase arc furnace with a non-conductive hearth // Electricity. 1954. No. 12. P. 38–42.
9. Patent 6114841 United States of America, Int. Cl. G05F 1/70. Method and a device for compensation of reactive power [Text] / Hasler J-P, Johansson T., Angquist L; Assignee Asea Brown Boveri AB (Vasteras, Sweden). Appl. No. 08/874,035; filed 12.06.1997; date of patent 5.09.2000.
10. Pupin V.M., Kuftin D.S., Safonov D.O. Analysis of voltage failures in the supply networks of enterprises and methods of protecting electrical equipment // Elektrooborudovanie: ehkspluataciya i remont. [Electrical equipment: operation and repair.] 2011. No. 4. pp. 35-41. (In Russian.).
11. Kartashev I.I., Plakida A.V., Khromyshev N.K. Analysis of voltage dips in electrical networks 100/220 kV // Elektrichestvo [Electricity.] 2005. No. 4. pp. 2-8. (In Russian)
12. Shpiganovich A.N., Murov I.S. Voltage dips in the electrical systems of enterprises // Nacionalnaya Associaciya Uchenyh [National Association of Scientists.] 2015. No. 2-4(7). P. 6-7. (In Russian)
13. Mustafa Selim Sezgin, Önder Polat, Kahraman Yumak, Ömer Gul, Necip Erman Atilla. Simulation of voltage sag events in distribution networks and utility-side mitigation methods // 2017 10th International Conference on Electrical and Electronics Engineering (ELECO). IEEE Conferences. Year: 2017. Pages: 211–215.
14. Mei Fei, Zhang Chenyu, Sha Haoyuan, Zheng Jianyong. Classification and recognition of voltage sags based on KFCM – SVM // 2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI). IEEE Conferences Year: 2017. Pages: 432–437.
15. Sharov Yu.V., Kartashev I.I., Tulsky V.N., Bolshakov O.V. The study of the relationship of indicators of quality of electric energy and reliability of power supply // Energoekspert [Energy Expert]. 2011. No. 6. P. 78-83. (In Russian).