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156
7.3.2 Necessity for Synchronizing
The necessity for synchronizing and parallel generator operation is predicated on several
factors that must be considered. They are:
x When the rated generating capacity of an existing system has been exceeded
by new load demands.
x When enhanced reliability (multiple generating vs. single unit generating) is to
be considered.
x When operating efficiency of generator sets is a valid concern (i.e., the ability to
add or remove generating sets as necessary) synchronizing will be required.
x When the economics of cogeneration and/or peak load shaving is to be
considered.
These additional generators will be connected to operate in parallel to each other and
supply power to the same load. The additional oncoming generators must be paralleled
properly to ensure:
x
x
x
The generators supply the proper power to the load.
Power transients are minimized.
System stability is maintained.
Fig 7.19 Typical industrial facility with its own on-site generators