Design of Squirrel-Cage Self-Excited 3-phase Induction Generator

Abstract

Due to the wide utilization of a 3-phase, squirrel-cage, self-excitation generator in renewable energy and isolated areas application, the paper deals with detailed design procedure of this type of generator, in a sequence and systematic manner. The design steps are obtained and executed in a Matlab file of the computer program to suit the newly designed constructions and parameters of the generator. In the new construction, the generator can be operated in a stable and saturation region. Due to the similarity in the construction of induction motor and generator, the formulas used in the calculation of equivalent circuit components of an induction motor may be utilized to calculate the parameters of the induction generator. To obtain optimized induction generator parameters and construction dimensions an ant colony algorithm is used to optimize these construction dimensions and generator parameters. The main objective parameters used in this algorithm are the generator efficiency, the excitation-capacitance, winding temperature rise, and minimum generator size is for 5 HP, 400 V, 50 Hz, and star connection generator.

Determination of the Harmonic Losses in an Induction Motor Fed by an Inverter

“…The first type is the space harmonic generated in the air gap as pulsating torques due to the magnetic interaction between different phases to produce the revolving magnetic field in the air gap. Space harmonics are reduced by improved design procedures and optimization [30]. These harmonics affect the motor starting and generate noise and vibration.…”