Related Projects

Develop and validate generic models for IBRs

We continue the detailed exploration of inverter-based resources (IBRs), focusing on their modeling, control, and integration into the power system. A lot of work has been done in developing and verifying generic models for wind, solar, and hybrid plants for system planning and protection studies. Improvements of the positive-sequence DER models and provide default parameters and co-simulation is ongoing. We are also developing and validating short-circuit response models for wind and solar PV generators. Some of our projects include creating procedures and tools for conformity assessment of IBRs.

Interconnection studies and analysis

EPRI developed the transmission hosting capacity tool (THCT) to screen through a wide range of scenarios representing different load levels, network conditions, and generation dispatch to compare regions of transmission network for future renewable generation/DER deployments. THCT can also compare across various possible generator retirement profiles/orders to ascertain whether there will be reactive power shortage or voltage constraints across the network. Short circuit level is an important identifier of strength for the power system. An increase in percentage of inverter-based generation in large power systems causes a reduction in the available fault current, resulting in a reduction of traditional system strength. A tool developed by EPRI called the Grid Strength Assessment Tool (GSAT) calculates various system strength metrics from a steady state analysis of the network model. The GSAT tool can be used to screen for locations that need a detailed study. A system planner running generation interconnection studies for inverter-based resources would thus be able to make use of GSAT to assess the potential for instability from the proposed interconnection and evaluate the need for a detailed dynamic study in electromagnetic time frame.

Inform industry on Standards development

EPRI plays a key role in this transformation by actively participating in the development of international standards through organizations such as IEEE, IEC, and CIGRE. These bodies help shape the technical foundations of the global energy transition. EPRI’s involvement ensures that the perspectives of utility professionals are considered in the creation of new standards. This participation also gives engineers early access to evolving technical documentation, and global best practices, allowing them to anticipate regulatory and technological changes and apply these insights to their own work. The alignment and improvement of leading practices across the utility sector provide a strong framework for engineers to enhance their technical capabilities and contribute to better system performance.

Support EPRI members in navigating the evolving IBR standards landscape

Staying on top of IBR reliability standards developments between day-to-day tasks can be a challenge and often requires extraordinary amount of time and commitment. Summaries and analyses of emerging standards provide EPRI members orientation on how standards can impact or help with their professional responsibilities, including potential standards adoption. EPRI seeks to facilitate collaboration among utilities, regulators, manufacturers, and system operators.