Analysis of Stability of Terminal Voltage of the Self-Excited Induction Generator with Leading Load

A general analysis to predict the steady-state and transient performances of an isolated self-excited induction generator feeding a balanced three-phase leading load is presented. The value of leading load power factor can be selected so that the terminal voltage is practically constant, regardless of the generator output power. For such power factor to be achieved, every load (such as an filament lamp, an induction motor, a heater, etc.) connected to a generator must be equipped with a power capacitor. This power capacitor is built into a load and, thus, becomes its component. The effect of the leading load and prime mover parameters on terminal voltage is shown for steady-state operation. Active power of small conventional induction motor in generating condition is found to be lower than in motorizing condition for rated values of current, voltage, and generated frequency. Also shown is the influence of line parameters on transient processes due to the sudden load change. Analysis has been carried out of transient processes that occur when leading load represented by an induction motor equipped with a power capacitor is being connected. Comparison of the predicted and the experimental results shows a good agreement.

Keywords:

• wind generators
• induction generator excitation
• asynchronous generator stability