طراحي و تحليل يك توربو-ژنراتور 200 مگاولت- آمپر دوقطب با خنك سازي هوا

Turbo-Alternator , Synchronous Generator , Armature- Reaction Field , Coil Pitch , Fraction Pitch , The Finite Element Method , Modeling an‎d Simulation

Design an‎d Analyis of a 200MVA Two-pole Air-Cooled Turbo-Generator

مهندسي برق

Today, the continuously increasing deman‎d for electrical energy in power systems an‎d the expansion of industrial loads have made synchronous generators in thermal power plant as the primary source of electrical power generation. Owing to their high power capability, acceptable efficiency, an‎d compatibility with various types of prime movers, turbo-generators remain the most important electrical machines for large-electrical power generation. With advances in modern manufacturing techniques, synchronous generators with ratings exceeding 2000 MW have been developed. At such very high power levels, the precise design of generator components, the selec‎tion of an appropriate cooling system, an‎d comprehensive design an‎d analysis of the machineʹs dynamic behavior are among the most significant challenges in electrical power engineering. In this research, following an extensive review of the relevant literature an‎d by selec‎ting the required design parameters, a two-pole cylindrical-rotor synchronous turbo-generator,rated at 200 MVA with a 15.75 kV terminal voltage is designed. The calculated results are then compared with the data of an actual synchronous generator to verify the accuracy of the design procedure. Since detailed design information for generators of this power rating is not widely available in the literature, several design calculations require further study. In the design process, parameters such as current density in the stator conductors, magnetic flux density, an‎d air-gap length were carefully selec‎ted to achieve values consistent with those of a practical generator. After completing the design process, the generator is analyzed using the Finite Element Method (FEM). The magnetic flux distribution an‎d magnetic field of the machine are eva‎luated, an‎d its performance is investigated under three operating conditions: no-load, connection to an infinite bus, an‎d three-phase short circuit. In the short-circuit analysis, the machine parameters, including the direct-axis synchronous reactance (Xd), transient direct-axis reactance (Xʹd), subtransient reactance (Xʹʹd), direct-axis transient time constant (Tʹd), an‎d direct-axis subtransient time constant (Tʹʹd), are obtained from the finite element analysis. These values are then compared with those of an actual generator. In the end, by comparing the calculated an‎d measured parameters, the validity an‎d accuracy of the proposed generator design are confirmed.

6

171918