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Requirements

The RT-LAB, Schematic Editor/Unified Database and eFPGASIM toolboxes must be installed on the host and target computers in order to run this example model properly. Please refer to the product documentation for details on version compatibility.

Setup and Connections

This model does not require any IOs, as it is more a demonstrator of the expected results.

It is possible to execute this simulation in different chassis. The "Simulator Selection" block in "satXfmrEnergization" root allows the user to select the appropriate target and automatically change the configuration and firmware.

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Procedure

RT-LAB model with eHS interface

The following procedure will help the user understand the functionality and linking between eFPGASIM, RT-LAB and Schematic Editor. A Hardware-in-the-loop based RT-LAB model, "satXfmrEnergization", is provided to illustrate the exchange of information between the controller and plant.

1. Click on "Run this demo" at the top of this section. The RT-LAB model will open automatically.

2. The RT-LAB model consists of a master subsystem (i.e. "sm_computation") and a console subsystem (i.e. "sc_user_interface").

   • The master subsystem has power network interface ("eHS_SE_SFunction_Drivers")

• The console subsystem is used to control set points, such as magnitude of source voltage and breaker activation during real-time simulation. Users can also monitor voltages and currents of the transformer at any point during the simulation.

3. For this example the role of each set points are as following:

   1. “VLN peak”: This sets the amplitude of the AC voltage source;

   2. “breaker manual command”: This sets the break state:

      0. the breaker opens;

      1. the breaker closes.

4. The "eHS_SE_SFunction_Drivers" solver solves the power network built using schematic editor software during the real time simulation. The circuit built in schematic editor can be edited or viewed by choosing the edit option available in the solver block.

5. eFPGASIM allows to simulate two different models for transformers:

   • linear (or unsaturated) transformer;

   • saturated transformer.

   In the linear model the effects of magnetic saturation are neglected, in contrast with the saturable transformer, where these effects are taken into account. Each model has its own block in OPAL-RT Schematic Editor Library Browser, with different parameters to be set.

6. When the model is compiled in Simulink, the configuration of the eHS solver will be generated according to the schematic editor circuit characteristics. Elements will be put into matrices and stored in .mat files that will be transferred into the solver when the model is run from the RT-LAB interface. Matrices are generated during model compilation in RT-LAB.

    

7. During real-time execution;

   1. Set reference voltage amplitude of the source VLN peak in the console. If voltage value is larger than transformer nominal voltage (V_LL,RMS=500 kV → V_LN,peak=408 kV), the core saturates and current and flux curves are distorted.

   2. Set the breaker state “breaker manual command” in the console. The energization process may be different depending on the instant the breaker is closed.