Induction Generator Power Factor

February 17, 2018

An ordinary induction generator connected to a power grid will draw lagging reactive volt amperes from the grid and supply real power to the grid. Therefore when running as a generator the machine takes reactive power from the ac power line and supplies active power back into the line.

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Unlike synchronous motors induction generators are load dependent and cannot be used alone for grid frequency control.

Induction generator power factor. Operating power factor of generator is defined based on whether it delivers lagging reactive power or it delivers leading reactive power. Induction generator absorbs lagging reactive power. Induction generators should be rated for the nominal system voltage or slightly higher rather than lower because the generator is now the power source rather than being a load on the power system.

Induction generator is not a self excited machine. Power factor correction information is available from companies that sup ply industrial capacitor banks the. As an example consider the use of a 10 hp 1760 rmin 440 v three phase induction motor as an asynchronous generator.

For example a 1000 kva transformer with an 80 power factor. Power factor correction capacitors can be used to correct the generator power factor in the same manner as for an induction motor. For its excitation it draws magnetising current reactive power from source itself.

This additional fee by increasing your power factor. Generator power factor note. It is simultaneously a lagging power factor load and a unity power factor supply.

In other words it delivers leading reactive power. Induction generator delivers leading reactive power and hence it is said to operate at leading power factor. 2 increased system capacity and reduced system losses in your electrical system by adding capacitors kvar generators to the system the power factor is improved and the kw capacity of the system is increased.

When induction generator is self excited means it draw the magnetizing current from the mains. Reactive power is needed for producing rotating magnetic field. At lower speedless negative slip the out put power would be less the effect of magnetizing.

Induction motor operating at a speed greater than synchronous speed act as induction generator supplying active power to source. Induction generators are particularly suitable for wind generating stations as in this case speed is always a variable factor. The full load current of the motor is 10 a and the full load power factor is 08.

The active power supplied back in the line is proportional to slip above the synchronous speed. Because kw equals kva times the power factory 08 lagging power factor is the nema standard the true output of this generator is 750 kva times 08 which equals 600kw. In most induction generator applications power factor correction in the form of capacitance will be required to raise the induction generators operating power factor up to the area of 090 to 095 lagging.