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Wind-driven self-excited induction generator with voltage and frequency regulated by a reduced-rating voltage source inverter

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2 Author(s)
Lopes, L.A.C. ; Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada ; Almeida, R.G.

This paper discusses the regulation of the voltage and frequency of a stand-alone fixed-pitch wind energy conversion system (WECS) based on a self-excited squirrel-cage induction machine. A shunt connected voltage source inverter (VSI) and a controllable dump load are used for regulation purposes. A battery bank is included in the dc side of the VSI so that it can absorb and inject active power thus increasing the efficiency and availability of the system. A control scheme for the VSI with independent control of active and reactive power allows the state of charge of the batteries to be kept in a safe range while maximizing the voltage regulating capabilities of the VSI. The characteristics of the wind turbine, self-excited generator, and the ratings of the VSI are considered in order to determine the load range for which voltage and frequency can be regulated for a given wind speed range. The feasibility of the proposed system is verified by simulations.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:21 ,  Issue: 2 )