Analytical Calculation of the Equivalent Circuit Parameters of Non-Salient Pole ‎Large Synchronous Generators

Document Type : Research paper

Author

Department of Intelligent Systems Engineering and Data Science, Persian Gulf University, Bushehr, Iran‎.

Abstract

Optimal Design of electrical machines using population-based optimization algorithms needs computationally fast model for evaluating the performance characteristics from design data, i.e. geometric dimensions, winding layouts, material properties. The Electric Equivalent Circuit (EEC) is a simple and appropriate model with acceptable accuracy to be incorporated in the design procedure. In this paper, an analytical approach is presented for calculating the EEC parameters of large non-salient pole synchronous generator based on winding-function method. Although the synchronous generator is well recognized, calculation of its dynamic EEC parameters is not reported in previous studies. Special issues of high-rated industrial synchronous generators are considered such as rotor slots with different dimensions, rotor sub-slots, the damper winding which is created from rotor wedges and retaining rings, saturation of magnetic flux routes in d-q-axis and stator core stacking. The connections of damper windings in d-q-axis and definitions of turn-ratios to refer the parameters to the stator-winding side are of novelties of the research. The calculated parameters for a 200MVA power-plant generator are compared with the experimentally obtained parameters. The results of EEC analysis of the studied machine have acceptable coincidence with the experimental and 2D finite-element simulation results, which proves the validity of the proposed method.

Keywords

References

[1]  H. Gorginpour, “Analysis and design considerations of an axial-flux dual-rotor consequent-pole Vernier-PM machine for direct-drive energy conversion systems”, IET Renew. Power Gener., vol. 14, pp. 211-21, 2020.
[2]  D. Aliprantis et al, “A synchronous machine model with saturation and arbitrary rotor network representation”, IEEE Trans. Energy Convers., vol. 20, pp. 584-594, 2005.
[3]  T. Lipo, Analysis of Synchronous Machines, 2nd ed., Florida, CRC Press: Taylor & Francis Group, 2012.
[4]  Test Procedures for Synchronous Machines, IEEE Std. 115, Dec. 1995.
[5]  A. Tessarolo et al., “A new method for determining the leakage inductances of a nine-phase synchronous machine from no-load and short-circuit tests”, IEEE Trans. Energy Convers., vol. 30, pp. 1515-27, 2015.
[6]  F. Mello and L. Hannett, “Validation of synchronous machine models and derivation of model parameters from tests”, IEEE Power Eng. Rev., vol. 1, pp. 19-20, 1981.
[7]  D. Aliprantis et al., “Experimental characterization procedure for a synchronous machine model with saturation and arbitrary rotor network representation”, IEEE Trans. Energy Convers., vol. 20, pp. 595-603, 2005.
[8]  I. Canay, “Determination of the model parameters of machines from the reactance operators xd(p), xq (p)”, IEEE Trans. Energy Convers., vol. 8, pp. 272-79, 1993.
[9]  P. Dandeno et al., “Adaptation and validation of turbogenerator model parameters through on-line frequency response measurements”, IEEE Trans. Power Apparatus Syst., vol. 100, pp. 1656-64, 1981.
[10]  J. Melgoza et al., “An algebraic approach for identifying operating point dependent parameters of synchronous machines using orthogonal series expansions”, IEEE Trans. Energy Convers., vol. 16, pp. 92-8, 2001.
[11]  M. Arjona et al., “Parameter estimation of a synchronous generator using a sine cardinal perturbation and mixed stochastic–deterministic algorithms”, IEEE Trans. Ind. Electron., vol. 58, pp. 486-93, 2011.
[12]  H. Liu et al., “Finite element analysis of 1 MW high speed wound-rotor synchronous machine”, IEEE Trans. Magn., vol. 48, pp. 4650-53, 2012.
[13]  O. Laldin, S. Sudhoff and S. Pekarek, “An analytical design model for wound rotor synchronous machines”, IEEE Trans. Energy Convers., vol. 30, pp. 1299-09, 2015.
[14]  H. Yaghobi et al., “Application of radial basis neural networks in fault diagnosis of synchronous generator”, J. Iran. Assoc. Electr. Electron. Eng.,vol. 10, pp. 23-36, 2013.
[15]  M. Karrari and O. Malik, “Nonlinear modeling of synchronous generators using wavelet transform-experimental results”, J. Iranian Assoc. Electr. Electron. Eng., vol. 1, pp. 24-30, 2004.
[16]  S. Nuzo et al., “Improved damper cage design for salient-pole synchronous generators”, IEEE Trans. Ind. Electron., vol. 64, pp. 1958-70, 2017.
[17]  Guide for Synchronous Generator Modeling Practices in Stability Analyzes, IEEE Std. 1110, 1991.
[18]  H. Gorginpour et al., “A novel rotor configuration for brushless doubly-fed induction generators”, IET Electr. Power Appl., vol. 7, pp. 106-115, 2013.
[19]  Z. Wu and O. Ojo, “Coupled-circuit-model simulation and airgap-field calculation of a dual-stator-winding induction machine”, IEEE Proc. Electr. Power Appl., vol. 153, pp. 387-400, 2006.
[20]  Z. Heidari, H. Gorginpour and M. Shahparasti, “Optimal electromagnetic-thermal design of a seven-phase induction motor for high-power variable-speed applications”, Sci. Iran., In-press, 2021.
[21]  M. Ojaghi and V. Bahari, “Rotor damping effects in dynamic modeling of three-phase synchronous machines under the stator interturn faults-winding function approach”, IEEE Trans. Ind. Appl., vol. 53, pp. 3020-28, 2017.
[22]  W. Xu et al., “Equivalent circuit derivation and performance analysis of a single-sided linear induction motor based on the winding function theory”, IEEE Trans. Veh. Tech., vol. 61, pp. 1515-25, 2012.
[23]  J. Pyrhonen, T. Jokinen and V Hrabovcova, Design of Rotating Electrical Machines, 1st ed., 2008.
[24]  K. Murthy, Computer-Aided Design of Electrical Machines, 1st ed., BS Publications, 2008.
Journal of Operation and Automation in Power Engineering
Volume 9, Issue 2
August 2021
Pages 172-181

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History

  • Receive Date: 20 December 2020
  • Revise Date: 21 January 2021
  • Accept Date: 11 February 2021

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