Abstract
This paper covers the analysis, dynamic modelling and control of an isolated self-excited induction generator (SEIG) driven by a wind turbine. The proposed dynamic model consists of induction generator, self-excitation capacitance and load model which are expressed in stationary d-q reference frame. The dynamic performance of SEIG is investigated under no load and on load. To predict the performance of the system, a MATLAB based simulation study using matlab embedded function block was carried out. Simulations from the variations of the speed and load display the dynamic behavior of the generator. A constant capacitor value of 100 micro-farads was used in this work. The simulation results obtained illustrate the changes in the voltage, currents, torque and magnetizing inductance of the generator. The wind velocity increase led to the increase in mechanical input from the wind turbine. This results in the increased rotor speed leading also to increased stator phase voltage. The obtained simulations also show that the output voltage of the induction generator depends greatly on its shaft speed and load; this poses a potential threat as it is capable of causing a significant variation in the power consumption in the load of the machine.
Highlights
Apart from the common use as motors, three-phase induction machines are used extensively as generators in electric power systems
There is need for gearbox since there should exist a downward to upward conversion at the side of wind turbine in favour of the speed or rotor, which is consequent of the induction machine type; that is whether it squirrel caged or wound rotor type
As the wind speed varies for any type of turbine, the rotor speed of the generator varies and it has effect on the voltage generated
Summary
Apart from the common use as motors, three-phase induction machines are used extensively as generators in electric power systems. The possibility of using a Self-Excited Induction Generator (SEIG) where a three-phase capacitor bank is connected across the stator terminals to supply the reactive power requirement of a load and generator was discovered by Basset and Potter in the 1930s (Basset & Potter, 2009). An induction machine connected and excited in this manner is capable of acting as a standalone generator supplying power (real and reactive) to a load. In this mode of operation, the capacitor bank supplies the reactive power requirement of the load and generator while the real power demand of the terminal load is supplied by the prime mover. In application to wind energy conversion systems, ijas.ideasspread.org
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