Rm. Hilloowala et Am. Sharaf, A UTILITY INTERACTIVE WIND ENERGY-CONVERSION SCHEME WITH AN ASYNCHRONOUS DC LINK USING A SUPPLEMENTARY CONTROL LOOP, IEEE transactions on energy conversion, 9(3), 1994, pp. 558-563
The paper presents modelling, simulation and experimental verification
of a utility interactive wind energy conversion scheme [WECS] with an
asynchronous link comprised of a diode bridge rectifier and a line co
mmutated inverter. The control objective is to track and extract maxim
um power to the utility. wind energy system [WSE] and transfer this po
wer to the utility. This is achieved by controlling the firing delay a
ngle of the inverter. Since the diode bridge rectifier has no control
on the dc link voltage, a supplementary control loop is used to limit
the voltage within a preset voltage threshold. The proposed scheme for
regulating the flow of power through the dc link ensures reduced reac
tive power burden on the self-excitation capacitor banks and better ut
ilisation of available wind energy, while limiting the dc link voltage
within a preset voltage threshold. The simulated results are experime
ntally verified and found to give good power tracking performance.