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Home > Archive > Electrical Engineering > June 2006 > 3 phase alternator
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3 phase alternator
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| 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???
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| Fred Lotte 2006-06-24, 5:25 pm |
| In article <1151149165.048053.122090@u72g2000cwu.googlegroups.com>,
"Ali" <mohdalibaig@gmail.com> wrote:
> i want to know about the
> parameters of 200MVA 18KV(PHASE to PHASE) and 50Hz 2pole alternator???
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.
--
Fred Lotte
flotte@nospam.stratos.net
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| Don Kelly 2006-06-24, 9:25 pm |
| 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.
--
Don Kelly dhky@shawcross.ca
remove the X to answer
----------------------------
"Ali" <mohdalibaig@gmail.com> wrote in message
news:1151149165.048053.122090@u72g2000cwu.googlegroups.com...
> 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???
>
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