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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 two blocks that are performing a numerical integration using the forward Euler method. 

Let be the transfer function in the Z-domain. Given an input signal to the block, the output signal evolves according to the following recursive relation:

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

A second block replicates the same integrator using a transfer function.

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

Hz1.u is the signal entering the transfer function

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

Hz1.y is the signal that is generated from the transfer function

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 transfer function.

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References

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

See Also

The CIGRE Integrator source files are located in your installation folder: Windows\demo\How To\CIGRE_Integrator\references\src