LABORATORY VOLTAGE AND FREQUENCY CONTROL FOR SELF EXCITED INDUCTION GENERATOR USING PROGRAMMABLE LOGIC CONTROLLERS

Hamed M. El-Shewy, Soliman Al-Tohamy, Shaimaa A. Mohammad

Abstract


The self excited induction generators have been receiving attention for last decades as the most
suitable power solution for remote areas. These have voltage and frequency regulation problems
that stand against their spreading. This paper presents two simple voltage and frequency
regulation methods for such stand-alone induction generators. The first and desired method,
based on stepped capacitor uses programmable logic controllers (plc) in order to maintain constant
values of the terminal voltage at different loads while frequency under different loads is
regulated by regulating the prime mover speed by the same plc. The second method was developed
by using an external resistance in series with the terminal capacitor while frequency under
different loads is regulated by regulating the prim-mover speed .both methods were experimentally
verified using a 1.5 kw squirrel cage induction generator supplying resistive loads. A
computer simulation model depending on the generator steady state performance was developed.
The experimental data show good agreement with computed results

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