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Alternative Energy Systems : Design and Analysis with by M. Godoy Simões

By M. Godoy Simões

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targeting renewable strength purposes and basics of induction turbines, this e-book offers assurance of assorted features on the topic of the layout, operation, and total research of such Read more...

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Extra resources for Alternative Energy Systems : Design and Analysis with Induction Generators, Second Edition

Example text

Therefore, independently of the load type, the following system of equations holds: [v] = [Z][i]. For the determination of the instantaneous currents, it is enough to obtain: [v] = [Z]–1 [i]. To find the voltage across the self-excitation capacitor, it is enough to take the case of an SEIG feeding an RL load.

1 represents a primitive machine through a Park transformation as applied to the induction generator. 2 Representation of SEIG in d–q axis. currents, and I dr and I qr to the rotor currents, in the direct and quadrature axis, respectively. The angular speed ω = dθ/dt is the mechanical rotor speed. 1, no external voltage is applied across the rotor or the stator windings. 7–10 However, there is an additional component: the self-excitation capacitor C. 1. That expression represents the ordinary symmetrical three-phase machine connected to a three-phase bank of identical parallel capacitors.

The circulating current in the rotor will depend on its impedance, the resistance and inductance of which alter slightly due to the skin effect for the usual values. However, only the inductance is affected in a more complex way by the slip factor, depending on the self-inductance of the rotor and on the frequency of the induced voltage and current. 6) where X r0 is the blocked rotor reactance. 3 Equivalent circuit per phase of the induction generator. 7) For small slip factors (s → 0) the rotor impedance becomes predominantly resistive and the rotor current can be considered to vary linearly with s.

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