Add REGFM_C1 and REPCGFM_C1 hybrid converter model#652
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… repcgfmc1.py change the case parameter of npcc.xlsx
…r-unit values both internal and external to the model, and resolving issues related to initialization current limiting and slow initialization.
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Summary
This pull request adds implementation support for the WECC/UNIFI hybrid grid-forming inverter-based resource models:
REGFM_C1: hybrid GFM/GFL inverter model
REPCGFM_C1: plant controller model for REGFM_C1
The implementation follows the standard-library hybrid GFM control structure, where the GFM branch and GFL branch operate in parallel in one inverter, and the plant controller dispatches active/reactive power commands to the GFL branch and voltage/frequency references to the GFM branch.
By adding REGFM_C1 and REPCGFM_C1, this pull request extends the renewable generator/converter model family in ANDES to support hybrid GFL/GFM inverter-based resource modeling. I hope this contribution can be useful for future renewable integration and grid-forming converter studies.
Main changes
Added the REGFM_C1 model implementation.
Added the REPCGFM_C1 plant controller implementation.
Added model parameters, services, states, algebraic variables, and initialization logic.
Added support for active/reactive power paths, voltage/frequency reference generation, loss compensation, and FFR-related logic.
Validation
I tested the models with a hybrid converter case based on the SMIB, IEEE 14-bus, NPCC 140-bus system.