Madansure, V.N.
July 1997
Fuel and Energy Abstracts, vol 38-4, p. 243
The paper explores the dynamics of intermittent load systems fed from a PV source, led by the expanding application of PV power in diverse areas. Most actual loads in small-scale village industry are intermittent and pulsating. For successful application of photovoltaics in these areas, the dynamic behaviour of such systems must be understood. This requires the formulation of dynamic models of PV-fed intermittent load systems. Bond graph methodology has recently emerged as a very convenient tool for dynamic modelling. This is the first application of this methodology in modelling photovoltaic systems. The spice-pounding operation is taken as a typical example of a pulsating load that can be fed from PV power. It is shown that the standard equivalent circuit of the PV cell gives rise to algebraic looping problems when expressed in the language of the bond graph. Means of overcoming the problem have been suggested. This is the first report of modelling the spice-pounding machine with the bond graph technique. The model has been simulated with COSMO-KGP software and the results reported. It is found that the dynamic behaviour of the PV-fed spice-pounding system differs significantly from that of a system fed from a constant voltage supply. Performance is compared for a shunt motor, a series motor and a separately excited motor, and three types of cam profiles, namely parabolic, cycloidal and half harmonic plus constant velocity.
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