Parametric identification of a distribution network as part of ascme
DOI:
https://doi.org/10.14529/power180106Keywords:
three-phase electrical grid, grid parameters, load model, identification methodAbstract
Modern automatic electricity metering systems (AEMS) are mainly designed to collect data from electronic meters used by the consumers served by a local electricity grid (LEG) and to account electricity commercially. At the same time, if significant improvements in the technical and economic performance of these systems and distribution companies are to be made, it is appropriate complement AEMS with new subsystems designed to perform real-time monitoring, diagnose the condition of the three-phase network, and optimize their operating modes. Creating methodological and algorithmic bases for their construction often necessitates knowledge of such LEG parameters that depend on the resistance of the mainline in its inter-consumer sections. In this respect, the paper dwells upon the problem of identifying them in real time. It is assumed that the network operates under conditions of unbalanced currents and voltages, and the cross-sections of phase and neutral conductors are different. The proposed parameter (resistance) identification method is based on modeling the physical processes in the electric circuits of the network, complemented by evaluating the physically immeasurable and uncontrollable varieties that specify the current electric state of the inter-consumer sections of a three-phase grid. To solve the identification problem, we’ve generated systems of linear algebraic equations are obtained. We herein describe the computational procedures for solving those equations analytically and numerically.
The proposed LEG parameter identification method can be used to developed special software for the functional AEMS subsystems designed to diagnose the current state of the functional LEG components as well as to identify and monitor electricity losses in real time.
References
Ozhegov A.N. Sistemy ASKUE [AEM Systems]. Kirov, Vjat St.Univ. Publ., 2006. 102 p.
Zhelezko Yu.S. Poteri elektroenergii. Reaktivnaya moshchnost'. Kachestvo elektroenergii [Power Loss. Reactive Power. Power Quality]. Moscow, JeNAS Publ., 2009. 456 p.
Khlebnikov V.K., Podgornyy D.E. [Calculating Power Losses in a 0.38 kV Grid Based on Current and Voltage Measurements with Account of Circuitry Data]. Izv. VUZ. Elektromekhanika [Higher School Proceed-ings. Electromechanics], 2004, no. 6.1, pp. 28–31. (in Russ.)
Omorov T.T., Takyrbashev B.K., Osmonova R.Ch. On Modelling Unbalanced Distributive Networks Incorporated in ASCAE. Bulletin of the South Ural State University. Ser. Power Engineering, 2017, vol. 17, no. 1, pp. 21–28. (in Russ.) DOI: 10.14529/power170103
Vladimirov L.V., Oshchepkov V.A., Bigun A.Ya., Kirichenko N.V. [Diagnosis of Distributive Electri-cal Grids in Single Line-to-Ground Fault]. Dinamika sistem, mekhanizmov i mashin [Dynamics of Systems, Mechanisms, and Machines], 2014, no. 1, pp. 236–239. (in Russ.)
Omorov T.T., Osmonova R.Ch., Takyrbashev B.K. [Diagnosis of Transmission Lines in Grids Connected to AEMS]. Kontrol'. Diagnostika [Control. Diagnostics], 2017, no. 5, pp. 44–48. (in Russ.) DOI: 10.14489/td.2017.05.pp.044-048
Ershov A.M., Filatov O.V., Molotok A.V., et al. [Protecting 380 V Grids from Overhead Line Tears]. Elektricheskiy stantsii [Power Plants], 2016, no. 5, pp. 28–33. (in Russ.)
Redkovsky N.N., Goureev V.A. Optimization Problems and Calculation of Electrical Networks Work Regimes. Optimization Methods and Software, 1997, vol. 7, no. 2, pp. 139–155. DOI: 10.1080/10556789708805649
Omorov T.T., Takyrbashev B.K. [Optimizing the Unbalanced Operation of Distribution Grids]. Pribo-ry i sistemy: Upravlenie, kontrol', diagnostika [Devices and Systems: Management, Control, Diagnostics], 2016, no. 6, pp. 11–15. (in Russ.)
Khabdullin A.B. [Optimizing Steady States in Factory Power Supplies vt Minimizing Power Losses]. Elektrooborudovanie: ekspluatatsiya i remont [Electrical Equipment: Operation and Repair], 2012, no. 2,
pp. 30–35. (in Russ.)
Kosoukhov F.D., Vasil'ev N.V., Filippov A.O. [Preventing Unbalance-Caused Current Losses and Improving the Quality of Power in 0.38 kV Grids Connected to Homes]. Elektrotekhnika [Electrical Equip-ment], 2014, no. 6, pp. 8–12. (in Russ.)
Zelenskii E.G., Kononov Y.G., Levchenko I.I. Identification of the Parameters of Distribution Net-works by Synchronized Current and Voltage Measurements. Russian Electrical Engineering, 2016, vol. 87, no. 7,
pp. 363–368. DOI: 10.3103/S1068371216070129
Stepanov A.S., Stepanov S.A., Kostyukova S.S. Identification of Parameters of Models of Electric Network Elements on the Basis of Tellegen’s Theorem. Russian Electrical Engineering, 2016, vol. 87, no. 7,
pp. 369–372. DOI: 10.3103/S1068371216070105
Kochergin S.V., Kobelev A.V., Khrebtov N.A., Kitashin P.A., Terekhov K.I. [Modeling 10/0.4 kV Grids Operating in Rural Areas]. Fraktal'noe modelirovanie [Fractal Modeling], 2013, no. 1, pp. 5–13. (in Russ.)
Sapronov A.A., Kuzhekov S.L., Tynyanskiy V.G. [Timely Detection of Uncontrollable Electricity Consumption in Up to 1 kV Grids]. Izv. vuzov. Elektromekhanika [News of Higher Education Institutions. Electromechanics], 2004, no. 1, pp. 55–58. (in Russ.)
Ponomarenko O.I., Kholiddinov I.I. [How Unbalance Affects Power Losses in Distribution Grids]. Energetik [Power Engineer], 2015, no. 12, pp. 6–8. (in Russ.)
Omorov T.T., Takyrbashev B.K., Osmonova R.Ch. [Finding the Parameteres of 0.4 kV Distribution Grids Based on AEMS Data]. Energetik [Power Engineer], 2017, no. 6, pp. 37–40. (in Russ.)
Demirchyan K.S., Neyman L.R., Korovkin A.V. Teoreticheskie osnovy elektrotekhniki [Theoretical Foundations of Electrical Engineering]. Vol. 1. St. Petersburg, Piter Publ., 2009. 512 p.
Korn G., Korn T. Spravochnik po matematike [Handbook of Mathematics]. Moscow, Nauka Publ., 1973. 831 p.
Bahvalov N.S. Chislennye metody [Numerical Methods]. Moscow, Nauka Publ., 1975. 632 p.
