3 phase alternator

is there any thumb formula for calculating the snync:alternator
parameters such as its inertia, damping factor etc from its
MVA,frequency and voltage ratings? i want to simulate a power network
on matlab but the problem is that my alternator rating doesnot match
with the preset models provided in matlab... i want to know about the
parameters of 200MVA 18KV(PHASE to PHASE) and 50Hz 2pole alternator???
Reply to
Ali
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If you don't have a specific machine in mind, and therefore don't have that machine's parameters, you can assume that the parameters expressed on the per-unit base of the machine are (nearly) the same for any similar machine. That is, the parameter expressed in per-unit on the machine base has nearly the same per-unit value across a wide MVA range of similar machines.
Edward Kimbark's book on synchronous machines has a table in the first 100 pages that gives typical values. In my old paperback (Dover edition) copy, it's table 2 on page 40. It gives high, low and average values for 4 types of synchronous machines (solid rotor, waterwheel, synchronous condenser, synchronous motor).
If you're doing a study of a specific system, talk to the machine vender. Using average values for the study of a specific system is worse than no study at all... you may as well use an average answer and avoid the trouble of doing the study.
Reply to
Fred Lotte
Will Matlab be even close to the capability required to handle the transient model of even a single alternator, much less one tied to a system with other machines?
Consider the number of non-linear simultaneous DEQ's to properly simulate a single machine with field and governor control dynamics, let alone the system load flow equations which are also non-linear even in steady state. Normally, highly developed and dedicated programs are used for such analysis. As to parameters. Fred has good advice.
Reply to
Don Kelly

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