Problem 12.4 - Thevenin Equivalent Circuit and Maximum Power Transfer
*
* NOTE: This is a two-part problem.
* 1. Determine the open circuit (Thevenin) voltage using PSpice.
* Determine the short circuit current by inspection, recognizing
* that there is only one device in the circuit when a short circuit
* is placed across the load terminals (2,0). Using the data from
* these two measurements, calculate the real and imaginary parts
* of the Thevenin output impedance.
* 2. Connect an RL load to the output terminals. The inductance is to
* have a model with a variable parameter L, where the inductance is
* to be varied in 1-millihenry steps. Choose the inductance so that
* the middle value of the five stepped values causes the load
* impedance R+jX to be the complex conjugate of the Thevenin
* impedance. Obtain the current values described in the problem
* statement. Plot the load real power as a function of the load
* reactance on a graph similar to Figure 12.19 of the textbook.
.OPT NoPAGE NOBIAS
V1 1 0 AC 100
RS ; Complete the circuit device statements.
R1
R2
L1
L2
C1
C2
.AC LIN 1 1K 1K
.PRINT AC
; Complete the .PRINT command to obtain the
; open circuit (Thevenin) phasor voltage.
; You must have sufficient data and a form
; useful for obtaining the complex Thevenin
; impedance.
.END
Problem 12.4, Part 2. Thevenin Equivalent Circuit and Maximum Power Transfer
.OPT NoPAGE NOBIAS
V1 1 0 AC 100
RS ; Complete the circuit device statements.
R1
R2
L1
L2
C1
C2
RLOAD 2 7 35.25
L3 7 0 LLOAD 1
.MODEL LLOAD IND(L=1)
.STEP IND LLOAD(L) ?????? ?????? 1M ; Enter minimum and maximum
; inductance values, with the
; middle value such that the load will be the
; conjugate of the Thevenin impedance at the
; frequency of the voltage source.
.AC LIN 1 1K 1K
.PRINT AC IM(RS) IP(RS) VM(2) VP(2)
.PRINT AC IM(RLOAD) IP(RLOAD)
.END