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Corresponding Author

El-Shamoty, M.

Subject Area

Electrical Engineering

Article Type

Original Study

Abstract

The power galned by a wind-turbine driven alternator or induction generator is characterised by its variable voltage and frequency. The stablisation of both variables is preferably done using a DC-link ; especially when the converted power is supplied to an Isolated load. A controlled rectifier receives this power to deliver it to the DC-link inverter. This inverter is uncontrolled and triggered by rigid impulses whose frequency corresponds to the required load frequency. It delivers the DC-link power to the isolated load at fixed constant voltage with the help of a controlled excitation synchronous frequency and compensator. The system arising according to this configuration is very sensetive to any sudden disturbances. This paper is concerned with the dynamic behaviour of this system; especially in case of synchronization and load variation. For this purpose a relevant mathematical model has been developed using the MATLAB is based mainly on three first order, non-linear differential software. The modelling equations. Their iterative solution requires the determination of additional group of indirect variables ; Interval by interval. This determination is carried out using a quasl-oscillated phasor diagram with time varying effective values, assuming the rigid impulse as reference. The results show the necessity of continuous control of the voltages on both sides of the inverter, by controlling the rectifler and the compensetor excitation. Thereby the advance angle of the Inverter can be held constant at a reasonable velue in order to minimize its reactive power demand. Also, it is necessary to optimize the computer damper parameters, as well as the DC-ink parameters, In order to get stable operation and to prevent system failures.

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