During plant operation it is often not possible to meet all of
the above-mentioned criteria. It is very important to determine
during the conceptual design phase which criteria are the
most important. After the PMS has met the essential criteria,
the others will be considered based on their importance. For
example, frequency and voltage control are more important
than active and reactive power sharing. DLN operation is also
more important than load sharing. Under no circumstances
however, should the concepts of robust control be
compromised.