How We Can Improve The Power Factor Of Induction Generator?

It's very difficult to safely and consistently raise the power factor of a self-excited induction generator since the capacitor that you're using to provide the excitation can only be in a certain range of values or you risk resonance with the IG.

There is no voltage regulation in an IG because you have no control over the excitation level, again you are at the mercy of the interaction between the external capacitance and the internal inductance of the machine. The same holds for the power factor.

Your question about poor frequency regulation indicates that more reading on IG's is required because there is NO frequency regulation unless the unit is paralleled with a fixed frequency source. The frequency of an isolated induction generator is a function of the speed of the prime mover, the capacitor, and the amount and type of electrical load.

There are devices known as Doubly Fed Induction Generators (DFIG) that overcome all the operational difficulties that you face, but those are much more sophisticated (and expensive) than a simple Self-Excited IG (SEIG).

• Induction generators are designed for specific applications and not for general purpose use. Contact your local distributor or sales representative to place a technical inquiry.

Power factor correction capacitors can be used to correct the generator power factor in the same manner as for an Induction Motor. However, if there is any chance that the generator may over-speed, whether connected to the power system or not, the capacitors should be connected to the system through a separate breaker so that when the generator breaker is opened, the capacitors will not be connected to the generator. Under overspeed conditions, the capacitors can overexcite the generator and cause uncontrolled high voltages to occur. These voltages can destroy generator insulation systems and also can be hazardous to other equipment and to personnel.

See more at: http://www.usmotors.com/TechDocs/ProFacts/Induction-Generator.aspx#sthash.k8rH242x.dpuf