The Induction Generator's Technical Basis
An induction generator is a type of AC or electrical generator that generates power using induction principles. In generator mode, the generator is driven by mechanically turning the rotor, resulting in a negative slip. The AC asynchronous motor can often be used as a generator without undergoing any internal alterations. Induction generators and motors generate electricity by turning their rotors faster than the synchronous frequency. The stator flux rotation is substantially quicker than the rotor revolution in regular motor operation. As a result, rotor currents are induced by the stator flux. This technique generates a rotor flow with magnetic polarity opposite that of the stator.
A turbine or engine that is the prime mover propels the rotor at a high speed to operate the generator. The rotor currents are still induced by the stator flux, but the opposing rotor flux cuts the stator coils, resulting in an active current. The motor is now acting as a generator, sending electricity back to the grid.
Wind turbines, as well as a variety of micro and tiny hydro facilities, frequently use induction generators. This is owing to their ability to generate power at a variety of rotor speeds. The generators are less complicated electrically and mechanically than other generators. Brushes and commutators are not required. They are well suited to and widely used in wind power plants where speed is a changeable component. The frequency regulation is one of the main advantages of the induction generator. The power system controls the volts and output frequency, which are unaffected by speed changes. The self-regulation mechanism reduces the control system's complexity.
The generator is becoming more popular as a means of recovering energy that would otherwise be lost. The generated electricity can be consumed on site or sold to the utility system that serves the area.
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