Abstract
Thermal management is often considered a bottleneck in the pursuit of the next generation hydrogenerator in the electric power system. Overheating of the complex rotor parts has become one of the main problems affecting safe and stable hydrogenerator operation. In this paper, a 250 MW hydrogenerator is analyzed. The transient electromagnetic field of the hydrogenerator is calculated and the losses of the rotor parts are obtained. The rotation of the hydrogenerator rotor is considered. Three-dimensional fluid and thermal mathematic and physical models of the hydrogenerator are established. The loss values from electromagnetic field calculations are applied to the rotor parts as heat sources in the temperature field. After solving the fluid and thermal equations of fluid-solid conjugated heat transfer, influence of the structures of rotor support plate, rotor pole body insulation, and rotor excitation winding on the fluid flow and temperature distribution in the rotor region of hydrogenerator is studied using the finite volume method. The calculated temperature result of rotor excitation winding is compared with the measured value. The calculated temperature result agrees well with the measured value. It provides an important reference for optimizing the rotor structure of the larger hydrogenerator.
Highlights
As a key energy conversion equipment in the electric power system, the safety and stability of hydrogenerator are very important
After solving the fluid and thermal equations of fluid–solid conjugated heat transfer, influence of the width of rotor support plate, the thickness of rotor pole body insulation, and the width of the rotor excitation winding on the fluid flow and temperature distribution in the rotor region of hydrogenerator is determined [18]-[22]
The highest temperature of the rotor excitation winding is 133°C and appears on the leeward side. It is 1°C higher than that of the rotor excitation winding on the leeward side under the original structure
Summary
As a key energy conversion equipment in the electric power system, the safety and stability of hydrogenerator are very important. The structures of rotor support plate, rotor pole body insulation, and rotor excitation winding could affect obviously the temperature of the rotor region in the hydrogenerator. Some other experts extensively studied hydrogenerator [9], [10], but very few focused on the influence of rotor structure on the fluid flow and temperature distribution in the rotor region of hydrogenerator. The transient electromagnetic field of the hydrogenerator is calculated and the losses of the rotor parts are obtained. After solving the fluid and thermal equations of fluid-solid conjugated heat transfer, influence of the structures of rotor support plate, rotor pole body insulation, and rotor excitation winding on the fluid flow and temperature distribution in the rotor region of hydrogenerator is studied using the finite volume method. This paper provides an important reference for the reasonable design of rotor structure in the larger hydrogenerator
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