Using Regulated Electrical Machines in Small Hydropower Plants Operating in a Power Network

Autor: R. I. Mustafayev, M. M. Musaev, L. H. Hasanova
Rok vydání: 2018
Předmět:
Zdroj: Russian Electrical Engineering. 89:322-327
ISSN: 1934-8010
1068-3712
DOI: 10.3103/s1068371218050061
Popis: Economic factors of operating hydroturbines used in small hydropower plants, including the Francis turbine, Pelton turbine, and axial Kaplan turbine with fixed blades (propeller turbine), are analyzed and compared as a function of the turbine-rotation frequency. It is found that the regulation of the turbine-rotation frequency depending on the changes in consumption of the energy carrier (water flow) improves the efficiency of the propeller turbines by 8–10% and leads to an increase in power production by the hydroaggregate as a whole. For these turbines, an expression describing the capacity (torque) as a function of the rotation frequency is obtained from the propeller characteristic of the turbine by approximating the frequency dependence of the turbine efficiency by a cubic polynomial. Since relative units were used, the obtained expression describes the characteristics of all propeller-type turbines. A mathematical model of an hydroaggregate consisting of a prototypical axial fixed-blade Kaplan hydroturbine coupled with a frequency-controlled synchronous generator with permanent magnets is developed. The study of static and dynamical operation modes of the above-mentioned hydraulic aggregate on the basis of this mathematical model verified the operability of the system and technical solutions used in its design.
Databáze: OpenAIRE
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