Co-generation system design exercise to reduce power consumption from the grid: A sugarcane crushing and sugar refining

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Co-generation system design exercise to reduce power
consumption from the grid:
A sugarcane crushing and sugar refining plant requires around
30MW of power for normal operation during the peak crushing season
of about 6 months. For the remaining period of the year, the
requirement falls to 7.5 MW to maintain essential facilities and
upkeep activities. The plant generates a residue which can be burnt
to produce the steam equivalent of 25 MWe on an average throughout
the year. Steam to electricity conversion is at 65% efficiency (35%
electricity and 30% heat). Process steam requirement during the
6-month production season amounts to 7.5 MWe and during the
non-crushing season 30% of the heat is recovered by a low-pressure
electrical generator. It can be assumed that any electrical
failures in the generators will not affect the steam throughput but
will cause the electricity production to cease.
Since the sugar production process during the production season
cannot stop, full redundancy is to be provided. Surplus generation
is available for export to grid. Suggest an appropriate primary
distribution system showing power import and export; internal
generation and measures for redundancy at the incoming and primary
distribution level. Select the ratings of transformers and
generators required.
Assume the sugarcane plant runs at 22kV and the grid voltage is
132kV.