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Induction generator connected to the capacitor bank is known as ______________
Self-Excited Induction Generator
Alternator
Synchronous generator
Grid Connected Induction Generator
Self-Excited Induction Generator
An Induction generator is essentially an induction motor driven above its synchronous speed. When connected to a capacitor bank, it provides the necessary reactive power to excite the stator windings, allowing the machine to operate as a self-excited induction generator (SEIG) independent of the grid.
An Induction generator is essentially an induction motor driven above its synchronous speed. When connected to a capacitor bank, it provides the necessary reactive power to excite the stator windings, allowing the machine to operate as a self-excited induction generator (SEIG) independent of the grid.
f=120PтЛЕNrтАЛтАЛ+fsтАЛ
QcтАЛ=3V2тЛЕ╧ЙC
The residual magnetism in the rotor creates a small voltage. When the capacitor bank is connected across the stator terminals, it provides leading reactive current, which increases the air-gap flux. This positive feedback loop continues until the saturation curve of the magnetic circuit intersects with the capacitor's V-I characteristic line, establishing a stable operating voltage.
Requires reactive power for magnetization.
Capacitors determine the terminal voltage and frequency.
Does not require a separate DC excitation source.
Frequency varies with rotor speed and load.
Brushless and simple construction
Low maintenance
Self-protection against short circuits
Poor voltage regulation
Frequency sensitive to load variations
Requires high reactive power for startup
Stand-alone wind turbines
Micro-hydro power plants
Remote village electrification
The capacitor bank must be sized correctly to match the magnetizing reactance of the induction machine; if the capacitor is too small, voltage buildup will not occur.
Option B (Alternator) refers to a synchronous generator which uses DC field excitation. Option C (Synchronous generator) produces constant frequency regardless of speed.
A is correct тАФ An induction generator requires an external source of reactive power, provided by a capacitor bank, to operate in self-excited mode.
Always remember that Induction Generators (SEIG) require reactive power, whereas Synchronous Generators supply reactive power to the grid.