Location

This example model can be found in the software under the category "How To" with the filename "CIGRE_Integrator.ecf".

Description

This model demonstrates the implementation of a user-defined block that follows the IEEE/Cigre DLL Modeling Method V1.1 (February 29, 2024).

Simulation and Results

The model consists of three blocks that are performing a numerical integration using the forward Euler method. 

Let the input signal of the block, the output signal is

with given by a control parameter.

The CIGRE user-defined block is implemented using a shared library (.dll).

A second block replicates the same integrator but is embedded within a UCM (imported from a Simulink model).

Additionally, a point-on-wave feature is incorporated into the model to synchronize input signals during Scopeview acquisitions.

To visualize the results of a running simulation, a ScopeView template named "CIGRE_Integrator.svt" is provided.

This enables quick comparisons of all block output values against each other.

Both blocks are non-direct feedthrough blocks, as they each contain a state.

CIGRE_1.input is the signal entering the CIGRE library

UCM1.In1 is the signal entering the integrator exported from Simulink

CIGRE_1.output is the signal that is generated from the CIGRE library

UCM1.Out1 is the signal that is generated from the integrator exported from Simulink

Results Interpretation:
As expected, the input values entering each block are identical, and all output values (integrated signals) match. This validates that the CIGRE block correctly integrates signals in alignment with the Simulink model.

References

[ 1 ] https://www.mathworks.com/help/simulink/slref/integrator.html

[ 2 ] https://www.cigre.org/

See Also

Integrator source files: