In the past decades, a large number of power electronic converter-based energy resources have been connected to grids around the world. The increasing number of such devices is pushing for both electromechanical and electromagnetic dynamic simulations to be part of routine stability studies for transmission planning studies. Hybrid wave-phasor simulations have been proposed in the literature to address this challenge. This paper describes Open-Instance Wave-Phasor Interface (OpenIWPI), a Modelica library used to couple phasor-based and electromagnetic power system models, allowing simulation and linearization of such hybrid models to be performed altogether. Examples are presented to describe how the library can be useful in power system studies.

Power systems undergoing large-scale renewable deployment require accurate dynamic models of inverter-based technologies such as solar photovoltaic plants, wind turbine generators, and battery energy storage systems to perform the require studies that would allow to assess and maintain power grid stability. The second generation of the Western Electricity Coordinating Council (WECC) generic renewable energy system (RES) models provides a general framework for modeling inverter-based resources in power system dynamics and stability studies. In this paper, we expand the existing Modelica-compliant open-source OpenIPSL.Electrical.Renewables package by implementing the Renewable Energy Generator/Converter B (REGC_B) model along with the Renewable Energy Electrical Controller (REEC\D) model, according to the second-generation WECC RES framework. Using Modelica's object-oriented features, the implementation emphasizes modularity and reusability in building scalable power system models using the OpenIPSL library. This work highlights the potential of using Modelica and OpenIPSL to support a standardized, scalable development of inverter-based RES models within the WECC framework, and extents the only fully Modelica-compliant open-source package that implements these models.

New York State (NYS) faces significant challenges in meeting the Climate Act’s bold goals of 70% renewable energy generation by 2030 and total decarbonization of the electric grid by 2040. Extensive simulations are required to assess the impact of numerous inverter-based resources (IBRs) deployed to the large-scale NYS power grid, aiming to evaluate their dynamic behavior and mitigate any negative interactions with their control schemes. However, the modeling efforts required are huge and the computational burden of large-scale simulations is extensive, and often limited by the capabilities of domain- specific tools. This work addresses these limitations by developing a Functional Mockup Unit (FMU) of Grid- Forming (GFM) Inverters for IBR control and integrating them with an electromechanical phasor-domain power system solver. The proposed FMU facilitates the simulation and parametric studies needed to analyze large- scale IBR usage with significantly improved manual modeling and computational efforts. The paper details the process of developing and FMU model for GFM IBRs, including all relevant control loops implemented in the Modelica language and FMU integrated in OPAL-RT’s ePHASORSIM software. Our FMU models are used to successfully deploy and study the impacts of up to 6, 200+ MVA from IBRs on the 5000-bus NYS transmission system.

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