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ARTEMiS/SSN Machines

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Description

Implement a 3-phase asynchronous machines, cage type (IM) and with accessible rotor terminal (DFIM), modelled with a fixed stator d-q rotor reference and for use with the SSN solver. Stator windings are connected in wye to an internal neutral point. The model is 4th order on the electrical side only. The mechanical model must be modelled externally to provide the rotor speed of the machine.

Mask

Parameters

Stator resistance (Ohms)

Stator leakage inductance (H)

Rotor resistance (Ohms) :As seen from the stator.

Rotor leakage inductance (H) : As seen from the stator.

Mutual inductance (H): As seen from the stator.

Number of pairs of poles: number of pair of poles

Stator to Rotor turn ratio: Ns/Nr, this is the ratio of stator winding turns (Ns) on rotor winding turns (Nr) Only available for the DFIM. The turn ratio is useful to apply correct voltage level on the rotor windings.

Sample Time (s): sample time of the model in seconds.

Input and Output signals

Simulink connection points

w_mec: mechanical speed of the machine in rad/s

meas: measurements available:

flux: phisd  phisq phird phirq (Wb): fluxes of the machines used as states internally.

Iabc(A): ABC terminal currents in Amperes.

Electrical torque (N.m): Electric torque of the machine in N.m.

Physical Modeling connection points

aS,bS,cS: stator phase connection points.

aR,bR,cR: rotor phase connection points.

Theory and working equations

Known Limitations

The model only accepts fundamental S.I. units parameters.

The model does not include saturation effects. An advanced user could however modify the model to dynamically change the magnetization inductance with respect to current. This magnetization inductance is available inside the model.

Example

SSN_Dual_IM_DFIMturnratio.mdl is an example that uses both IM and DFIM. In the model, the 2 grid-connected machines are driven at constant slip, then a fault is made near the grid and the DFIM is disconnected a while after. The model is designed to demonstrate that the DFIM can be simulated without any parasitic load even when running with open stator.

References

[1] C. Dufour, D. S. Nasrallah, “State-space-nodal rotating machine models with improved numerical stability”, IECON-2016 conference, Florence, Italy, Oct. 2016.

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