Soft Synchronization of a Hydraulic Turbine Generator and Power Grid

International Journal of Electrical and Electronics Engineering

© 2025 by SSRG - IJEEE Journal

Volume 12 Issue 5

Year of Publication : 2025

Authors : Marcos Gabriel Saraza Mamani, German Reymer Apaza Mayta, German Alberto Echaiz Espinoza, Pedro Alberto Mamani Apaza, Fernando Enrique Echaiz Espinoza

10.14445/23488379/IJEEE-V12I5P109

How to Cite?

Marcos Gabriel Saraza Mamani, German Reymer Apaza Mayta, German Alberto Echaiz Espinoza, Pedro Alberto Mamani Apaza, Fernando Enrique Echaiz Espinoza, "Soft Synchronization of a Hydraulic Turbine Generator and Power Grid," SSRG International Journal of Electrical and Electronics Engineering, vol. 12,  no. 5, pp. 91-102, 2025. Crossref, https://doi.org/10.14445/23488379/IJEEE-V12I5P109

Abstract:

This paper presents the analysis and simulation of synchronization between an active power grid and a power generation system driven by a Francis-type hydraulic turbine, using the model available in Simulink. Synchronization is a fundamental process in electrical systems, allowing the safe and efficient connection of generators in parallel with the grid. To achieve this, it is necessary to adjust the generator’s voltage, frequency, and phase angle to match the grid values. Although physical equipment exists for this interconnection, this research simulates a soft synchronizer as an alternative to optimize the synchronization angle adjustment. To analyze the voltage signals, the d-q-0 reference frame transformation is employed, simplifying processing and enabling more precise detection of variations in voltage magnitude and phase angle. The theoretical framework of this research encompasses power system theory, electrical machines, and control, as well as mathematical models of Francis hydraulic turbines. Using Simulink libraries in MATLAB, the results obtained are evaluated based on variations in voltage, frequency, and phase angle during the transient synchronization period. The results show a considerable decrease in generator magnitude oscillations.

Keywords:

Soft Synchronizer, Hydraulic Generator, Microgrid, Reference Frame Transformation, Signal Conditioner.

References:

[1] Mobin Naderi et al., “Synchronization Stability of Interconnected Microgrids with Fully Inverter-based Distributed Energy Resources,” Journal of Modern Power Systems and Clean Energy, vol. 11, no. 4, pp. 1257-1268, 2023.
[CrossRef] [Google Scholar] [Publisher Link]
[2] Ritu Raj Shrivastwa et al., “Understanding Microgrids and Their Future Trends,” 2019 IEEE International Conference on Industrial Technology (ICIT), Melbourne, VIC, Australia, pp. 1723-1728, 2019.
[CrossRef] [Google Scholar] [Publisher Link]
[3] Ana Cecilia Moreno Alamo et al., “Study of Distributed Generation Systems that Supplies Electrical Energy to Distribution Networks,” 2022 Portland International Conference on Management of Engineering and Technology (PICMET), Portland, OR, USA, pp. 1-13, 2022.
[CrossRef] [Google Scholar] [Publisher Link]
[4] Changhee Cho et al., “New Ideas for a Soft Synchronizer Applied to CHP Cogeneration,” IEEE Transactions on Power Delivery, vol. 26, no. 1, pp. 11-21, 2011.
[CrossRef] [Google Scholar] [Publisher Link]
[5] Motilal Senapati, and Gyan Ranjan Biswal, “Dynamic Study of Salient Pole Synchronous Hydro Generator - Turbine Set Under Variable Excitation,” 2015 Annual IEEE India Conference (INDICON), New Delhi, India, pp. 1-5, 2015.
[CrossRef] [Google Scholar] [Publisher Link]
[6] Q. Zeng, and L. Chang, “A New Method for Three-Phase Voltage Detection and Protection Based on Reference Frame Transformation,” 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551), Aachen, Germany, pp. 2489-2493, 2004.
[CrossRef] [Google Scholar] [Publisher Link]
[7] S. P. Gawande et al., “Synchronization of Synchronous Generator and Induction Generator for Voltage & Frequency Stability Using STATCOM,” 2010 3rd International Conference on Emerging Trends in Engineering and Technology, Goa, India, pp. 407-412, 2010.
[CrossRef] [Google Scholar] [Publisher Link]
[8] Adrian Timbus et al., “Synchronization Methods for Three Phase Distributed Power Generation Systems - An Overview and Evaluation,” 2005 IEEE 36th Power Electronics Specialists Conference, Dresden, Germany, pp. 2474-2481, 2005.
[CrossRef] [Google Scholar] [Publisher Link]
[9] Edith Clarke, Circuit Analysis of AC Power Systems, Symmetrical and Related Components, vol. 1, New York, 1943.
[Google Scholar]
[10] Mathworks. Park’s Transform, 2024. [Online]. Available: https://la.mathworks.com/help/sps/ref/parktransform.html 
[11] MathWorks, Simscape Electrical, 2024. [Online] Available: https://www.mathworks.com/products/simscape-electrical.html 
[12] “IEEE Guide for Synchronous Generator Modeling Practices and Applications in Power System Stability Analyses,” IEEE Power Engineering Society, pp. 1-81, 2003.
[Google Scholar] [Publisher Link]
[13] Mathworks, Hydraulic Turbine and Governor, 2024. [Online]. Available:
https://la.mathworks.com/help/sps/powersys/ref/synchronousmachinepufundamental.html
[14] Basile Kawkabani, Christophe Nicolet, and Alexander Schwery, “Modeling and Control of Large Salient-Pole Synchronous Hydro Generators and Stability Issues in Isolated Production Mode,” 2013 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD), Paris, France, pp. 148-157, 2013.
[CrossRef] [Google Scholar] [Publisher Link]
[15] Working Group Prime Mover and Energy Supply, “Hydraulic Turbine and Turbine Control Models for System Dynamic Studies,” IEEE Transactions on Power Systems, vol. 7, no. 1, pp. 167-179, 1992.
[CrossRef] [Google Scholar] [Publisher Link]
[16] “IEEE Recommended Practice for Excitation System Models for Power System Stability Studies,” IEEE Std 421.5-2016, pp. 1-207, 2016.
[Google Scholar] [Publisher Link]
[17] Woodward Reference Manual, Governing Fundamentals and Power Managements, 2004. [Online]. Available: 
https://www.pbm.hr/media/1101/woodward-governing-fundamentals.pdf