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Constant Param, 3-ph
- Sylvain Ménard
- Victoria Bruny
Description
The constant parameter (CP) line model assumes that the line parameters R , L, and C are independent of the frequency effects caused by the skin effect on phase conductors and on the ground. The model considers L and C to be distributed (ideal line) and R to be lumped at three places (line ends R/4 and line middle R/2). The shunt conductance G is taken as zero. The frequency dependence of the line parameters (represented in the FD model) is an important factor for the accurate simulation of waveform and peak values. However, the CP model is very robust, simple, and fast. It also provides a good alternative for a first approximation analysis.
A transposed or untransposed CP line is represented by a) its sequences, or b) its propagation modes and the transformation matrix (Ti) between mode currents and phase currents.
Implementation details can be found in:
H. W. Dommel, "Digital computer solution of electromagnetic transients in single and multiphase networks," IEEE Trans. Power App. Syst., vol. pas-88, pp. 388-99, 04/ 1969.
Mask and Parameters
General Parameters
Name | Description | Unit | Variable = {Possible Values} | |||
|---|---|---|---|---|---|---|
Description | Use this field to add information about the component | Description = {'string'} | ||||
EMTP (.pun) file for line parameters calculation | The location (path) of the EMTP file (pun file) containing the line parameters | File = {'path.name'} | ||||
L-C units in EMTP (.pun) file | The units from the pun file can be taken using two options | L-C units = { 0, 1} | ||||
mH/km, uF/km {0} | Inductance (L), capacitance (C) | |||||
Ohm/km, uS/km {1} | Inductive (Xl) and capacitive (Xc) reactances | |||||
Line Length | The length of the line | km | length = {0, 1e64} | |||
R | Per unit length resistance for each phase (mode) | Ω/km | R = {'-1e64, 1e64'} | |||
L | Per unit length inductance for each phase (mode) | H/km | L = {'-1e64, 1e64'} | |||
C | Per unit length capacitor for each phase (mode) | F/km | C = {'-1e64, 1e64'} | |||
Base power (perPhase) | Base value for PU conversion | MVA per phase | pBase = { [1, 1e64] } | |||
Base voltage (rmsLN) | Base value for PU conversion | kV rms LN | vBase = { [1, 1e64] } | |||
Base frequency | Base value for PU conversion | Hz | fBase = { [1, 1e64] } | |||
Continuously transposed line | Transposition (Untransposed/Transposed) | transp = { 0, 1} | ||||
No {0} | Untransposed line | |||||
Yes {1} | Transposed line | |||||
Transformation matrix | Transformation matrix between mode current and phase current ([Iphase] = [Ti] x [Imode]); not used in the case of transposed line. | Ti = { [-1e64, 1e64] } | ||||