For a three-phase induction machine on the range of 10-50 hp, find the typical power factor and calculate the required self-excitation capacitances in order to build a self-excited induction generator isolated system.
Prepare a scenario for studying cost of capacitance versus cost of machine for this range. Extend the machine rated power further to 100 hp or beyond 200 hp and study which capacitances are required and their required cost.
Propose a break even decision that makes such self-excitation capacitance still possible.
Now, consider the use of a three-phase inverter with a battery on the dc-link to provide VARs for an isolated induction generator and compare to the previous studies;
suggest for which application range it is recommended the use of excitation capacitances versus using a three-phase inverter for providing excitation for the machine.