Environmental Engineering Reference
In-Depth Information
Z
T
Network
conisting of
passive elements
and energy
sources
One-
port
V
T
Figure A.27
Th é venin equivalent circuit
sources can be replaced by an ideal voltage source
V
T
(the Thévenin voltage) in series with
an impedance
Z
T
(the Th é venin impedance).
V
T
is the open-circuit voltage of the two-port
and
Z
T
is the ratio of the open-circuit voltage divided by the short-circuit current. This equiva-
lence, which is of considerable value in power system analysis, is illustrated in Figure A.27.
Proof of this theorem can be found in Reference [1] or any other text on electric network
theory.
Reference
[1] Smith , R.J. and Dorf , R.C.
Circuits, Devices and Systems
, John Wiley & Sons, Ltd, Chichester, 1992 .
