SCIM/DFIM Magnetizing inductance parameters file

1 How to specify the magnetizing inductance parameters of an induction machine with saturation in the Schematic Editor?
2 What is the format of the IM with saturation magnetizing inductance parameters file?
- 2.1 No-load saturation curve parameters
  - 2.1.1 Parameters constraints
- 2.2 Flux-dependent magnetizing inductance
  - 2.2.1 Parameter constraints

DFIM and SCIM machines share the same magnetizing inductance parameters

How to specify the magnetizing inductance parameters of an induction machine with saturation in the Schematic Editor?

The induction machine (IM) with saturation block uses a table-defined magnetizing inductance.

This file has to be in one of the specific formats which are described below.

What is the format of the IM with saturation magnetizing inductance parameters file?

There are two possible formats for the parameter file, depending on the option selected by the user. In both cases, the electrical parameters are described in a JSON format.

No-load saturation curve parameters

If the user selects the option "Stator Voltage Line to Line VS Stator Current", which is the default option, the following parameters must appear in the file.

Parameter (JSON key)	Value type	Unit	Description	Example

Parameter (JSON key)	Value type	Unit	Description	Example
NoLoadStatorCurrent	double array	Arms	Root mean-square value of the stator current measured under no-load test conditions.	^{"NoLoadStatorCurrent": [} ^5.0, ^10.0, ^17.0 ^],
NoLoadLineToLineVoltage	double array	Vrms	Root mean-square value of the line-to-line voltage measured under no-load test conditions.	^{"NoLoadLineToLineVoltage": [} ^120.0, ^230.0, ^300.0 ^],
NoLoadFrequency	double	Hertz	Frequency used during no-load test. This value shall not be zero.	^{"NoLoadFrequency": 60,}
NominalStatorLeakageInductance	double	Henry	Nominal value of stator leakage inductance, calculated from the locked-root test.	^{"NominalStatorLeakageInductance": 0.0008,}

For further information about locked-rotor test and no-load test, please refer to IEEE Std 112 - IEEE Standard Test Procedure for Polyphase Induction Motors and Generators .

The examples provided above, when combined in a valid JSON format, would appear as follows:

{
  "NoLoadStatorCurrent": [
    5.0,
    10.0,
    17.0
  ],
  "NoLoadLineToLineVoltage": [
    120.0,
    230.0,
    300.0
  ],
  "NoLoadFrequency": 60,
  "NominalStatorLeakageInductance": 0.0008
}

Parameters constraints

The parameters in the file must be compatible with the induction machine equivalent circuit per phase. If the measurements and the nominal parameters are not compatible, an error message will be raised.

The following constraints applies for the no-load saturation curve parameters.

where

is the nominal value of stator leakage inductance, and
is the frequency used during no-load test.

Additionally, the number of elements of the array “NoLoadStatorCurrent“ shall be the same of “NoLoadLineToLineVoltage“.

Flux-dependent magnetizing inductance

Alternatively, if the user selects the option "Magnetizing Inductance VS Magnetizing Flux", the following parameters must appear in the file.

Parameter (JSON key)	Value type	Unit	Description	Example

Parameter (JSON key)	Value type	Unit	Description	Example
MagnetizingFlux	double array	Weber	Magnetizing flux	^{"MagnetizingFlux": [} ^0.2538689, ^0.4866922, ^0.5275961, ^0.6298437, ^0.6748371 ^],
MagnetizingInductance	double array	Henry	Magnetizing inductance	^{"MagnetizingInductance": [} ^0.0343205, ^0.0346647, ^0.0309804, ^0.0256869, ^0.0242660 ^]

The examples provided above, when combined in a valid JSON format, would appear as follows:

{
  "MagnetizingFlux": [
    0.2538689,
    0.4866922,
    0.5275961,
    0.6298437,
    0.6748371
  ],
  "MagnetizingInductance": [
    0.0343205,
    0.0346647,
    0.0309804,
    0.0256869,
    0.0242660
  ]
}

Parameter constraints

The following constraints applies for the flux-dependent magnetizing inductance parameters:

where

is the magnetizing flux, and
is the magnetizing inductance.

Additionally, the number of elements of the array “MagnetizingFlux“ shall be the same of “MagnetizingInductance“.