Acknowledged agreement with some presentation points; ZEG’s experience categorized into older plants with outdated inverters and OEMs, affecting plan verification and PGRR109 requirements.
Newer projects experienced smoother processes due to better organization and verification compliance.
Emphasized the importance of engineering assessment over purely numerical or document-based approaches to determine maximization capabilities.
Sophisticated entities avoid overcommitting to RFI without sufficient engineering analysis, planned for full assessment by December 2025.
Discussed various requirements (FRT, IEEE, VRT) based on resource entities' type, SGIA execution, and GIM execution post August 1st, 2024.
Highlighted the necessity for extensive internal analysis of inverter capabilities relative to plant-level operations.
Encouraged utilizing detailed PSCAD simulations for a realistic assessment of maximization capabilities.
Outlined challenges in translating inverter specs to plant capability due to data gaps and overwhelming OEM data.
Raised questions regarding ERCOT's DocuSign review process, the binding nature of submissions, potential for extensions, post-submission steps, and other areas needing clarity.
Stressed the need for holistic capability assessments while avoiding reliance solely on broader spec values.
▶️4 - Comparison of NERC PRC-029, IEEE2800, NOGRR255
NERC’s PRC-028 standard was approved in February 2024 and takes effect July 1, 2025.
The standard aims to improve disturbance data reporting from inverter-based resources (IBRs), driven by recent disturbances and reliability concerns.
PRC-028 applies to both new and existing IBRs.
In contrast, IEEE 2800 only applies to new units, and NOGRR255 (ERCOT rule) applies to both but with different levels of rigor.
One key difference: PRC-028 drops the requirement for feeder-end fault recording, which NOGRR255 retains (at least SOE data for the last 10% of IBRs per feeder).
Data requirements across standards include fault recording, SOE (Sequence of Events), and DDR (Dynamic Disturbance Recording).
NOGRR255 adds monitoring of specific control commands and mode values, which aren’t required by PRC-028 or IEEE 2800.
Presented details of differences for sampling rates, DDR output rates, time synchronization requirements, data retention and reporting timelines, and the restoration of failed equipment.
Overall, NOGRR255 is stricter than PRC-028 in most technical areas, though PRC-028 has tighter deadlines and more rigid completeness expectations.
Spring technical workshop featured topics important to IBRWG, including sessions on oscillations and stability, grid forming inverters, and North Corridor 901 milestone three.
Ontario IESO has included a requirement for all battery energy resources to have grid forming capability in their connection assessment application, aiming to future-proof the system.
EPRI study in South Texas highlighted stability benefits of grid forming batteries and the importance of strategic placement for optimal effectiveness. This may involve case-specific tuning.
Examples were provided of grid forming applications next to data centers and in the Chilean system, demonstrating benefits for voltage and frequency control, inertia, and system stability.
Global tracking of interconnection requirements and specifications for grid forming is ongoing, including recent updates like FinGrid's publication.
Discussion on i2X first, a DOE funded project addressing long interconnection queue waits and standards for inverter-based resources, focusing on improving interconnection reliability.
Highlights from the ECIC technical workshop included discussions on conformity assessment, model validation efforts, periodic testing, and standards comparison.
Upcoming i2X first meeting on April 29 will focus on voltage support, including discussions on VARs at night, voltage control, and reactive power requirements.
Survey launched for feedback on i2X first meetings to improve the next round focusing on the adoption of IEEE 2800 and grid forming specifications, expected to start in May.
