DESIGN OF BRUSHLESS EXCITER SYNCHRONOUS GENERATOR WITH 314 MW POWER CAPACITY

Abstract

Synchronous generator requires an excitation system to generate voltage. One of the excitation systems used is a static excitation system where the distribution of the excitation current uses charcoal brushes and slip rings, this causes many losses, namely sparks which can cause the unit to trip, then the current flowing by the charcoal brushes is relatively small, namely 10 A/cm2 . So to eliminate the use of charcoal brushes, namely by using a brushless excitation system. This design is carried out for a synchronous generator with a power capacity of 314 MW at full load conditions with an excitation current of 2810 A and an excitation voltage of 405 V. In this design the components that are considered are the permanent magnet generator, main generator, 3-phase full bridge converter, and rotating rectifier. . The designed PMG capacity is 324.632 kVA, 3 phase full bridge converter capacity is 181.77 kVA, main generator capacity is 2385.1 kVA, and rotary diode capacity is 1138.05 kVA. With this design, the brushless excitation system is capable of producing 314 MW of power with an output voltage of 19002.563 V. The results of theoretical calculations, simulation tests, and generator nameplates are compared, and produce tolerance values below 5%, in accordance with IEEE 1159 standard of 2019 With Thus, the brushless excitation system design achieves the desired performance according to the specified generator specifications.