master:const parametersPSCAD Real Constant

Every parameter of the PSCAD Real Constant (master:const): 3 names, with the unit, the default and the meaning PSCAD gives each one. Copy a name into parameters().

What master:const is

A real constant: a value a script can write to move a set-point or a gain without touching the model's structure.

Definition
master:const
PSCAD name
Real Constant
Category
Control blocks
Parameters
3, in 1 group
Read from
PSCAD 5.0.0, 2026-11-07

Most used master:const parameters

ParameterUnitDescription
Value·Real Constant Valuethe value it outputs
Name·Label for the Constantits label

Read and write master:const in Python

import mhi.pscad

pscad = mhi.pscad.connect()              # the PSCAD that is open; launch() starts one
project = pscad.project("my_case")       # a case loaded in the workspace

for comp in project.find_all("master:const"):   # the exact definition, namespace first
    params = comp.parameters()           # every parameter, as PSCAD holds it
    print(str(params["Value"]))          # Real Constant Value

comp = project.find_all("master:const")[0]
comp.parameters(Value="2")               # written as text
  • A parameter is named exactly as in the table, letter case included: parameters() gives every one of them in a dictionary, and a name the component does not have is refused.
  • A value that carries a unit comes back as a number whose unit is only in its text, so read it as text first (str(...)) or the unit is lost. PSCAD keeps a written unit as it is given: "2500 [mohm]" stays in mohm.
  • A Choice is read and written as its symbol (the capitals in "Written as"), not as the words PSCAD shows in the dialog.
  • find_all() takes the exact definition only. A wildcard or a bare name without master: comes back empty; the Builder's px_find walks the pages for those.

The Builder's runtime does the same with the unit handled for you: px_get(comp, "Value") and px_set(...), which also records the old value so the case is put back at the end. Getting started shows them.

Configuration

ParameterUnitDefaultDescription
DimInteger·1Output DimensionDimension of the outputRange 1 to 2147483647
NameText··Label for the ConstantOptional text for identification purpose
ValueReal·1.0Real Constant Value

Related

← master:ratelimit Rate Limiter · master:realpole Real Pole →