Topic:"Power Infrastructure" in M11307

Wind & Solar - There is a similar wind buildout for all scenarios between 2025 and 2030. For all scenarios modeled, a significant buildout of approximately 1500MW of new wind capacity (beyond the 600MW in service today) is added to the sys...

AI summary The analysis outlines a planned 1500MW wind and 200MW solar buildout by 2030 across scenarios. The bi-directional Atlantic Loop scenario explores renewable exports/importsWith Hydro Quebec, requiring additional wind capacity. Earlier wind expansion is observed in the No Atlantic Loop reference scenario compared to the With Atlantic Loop scenario.

ITEM 3: THERMAL RETIREMENT PLAN Progress the Thermal Plant Retirement, Redevelopment and Replacement Plan.

AI summary The proceeding item seeks to advance the Thermal Plant Retirement, Redevelopment, and Replacement Plan, focusing on retiring aging thermal generation assets and replacing them with new infrastructure to align with regulatory and environmental objectives.

2. Reliability Tie and Regional Integration NSPI continues to show need for the development of the Reliability Tie, and the IRP modeling results reflect the inclusion of the Tie, with an in-service date of 2028. Action Plan Item 1a is deve...

AI summary NSPI emphasizes the necessity of the Reliability Tie for wind resource integration by 2028, with IRP modeling supporting its inclusion. By 2030, 2,000 MW of wind capacity is required. Synapse recommends prioritizing the Tie's development. The Action Plan also includes exploring Atlantic Loop integration.

will be released to stakeholders for their review and NS Power will request feedback on the findings. will be evaluated by further study work (Updated Ac�on Plan page 7), including generator site– specific system impact studies for new var...

AI summary The document discusses the need for further study on the impact of adding synchronous condensers to the grid, as well as the evaluation of the Atlantic Loop's capital costs and energy import/export assumptions. NS Power agrees with Synapse on the importance of regional integration evaluations and updating modeling based on changes in assumptions.

[Appendix B: Sensitive SCMVA Buses](#page-58-0) - Table B 1: SCMVA Sensitive Buses, 2023 Typical SCMVA - Table B 2: SCMVA Sensitive Buses, 2023 Minimum SCMVA, 2 thermals, ML - Table B 3: SCMVA Sensitive Buses, 2030 SCMVA, RoCoF Case 511 -...

AI summary Appendix B presents tables analyzing Short Circuit MVA (SCMVA) sensitivity for critical buses in Nova Scotia's power system under various scenarios (2023/2030, thermal limits, tie lines, inertia levels). The data reflects system stability considerations for the Bulk Electric System (BES) under different operational conditions.

urrences can also result in slow recovery of the system normal voltage levels. There is an increased potential for harmonics, transients, and subsynchronous interactions with online synchronous units. The design of PE interfaced devices un...

AI summary The text discusses technical challenges in maintaining system stability, voltage control, and fault ride-through capabilities with the integration of power-electronic (PE) interfaced devices under low inertia and low short-circuit ratio (SCR) conditions. Key concerns include reduced system strength, harmonics, control interactions (CI), and torsional oscillations affecting thermal generators.

o large and rapid voltage phase shifts. Until IBR technology is further advanced, some SIR will be required to maintain acceptable performance for an NSPI generation mix that includes large scale IBR. As mentioned previously, converter-bas...

AI summary The document discusses challenges in maintaining frequency control with inverter-based resources (IBR) in Nova Scotia's grid. IBR, such as wind energy converters (WECs), lack synchronous inertial response (SIR) and rely on fast frequency response (FFR). NSPI requires 4 Hz/s RoCoF ride-through for new generation, evaluated via PSS®E and PSCADTM studies. Solutions include synchronous generation, HVDC, and energy storage.

5.4.2 Control Interactions Control Interactions (CI) is a specific issue that can impact the coordinated operation of Power Electronic devices in a local area. Control systems of dynamic devices can interact in an undesirable manner result...

AI summary Control Interactions (CI) can lead to unstable oscillations in power systems, especially with fast-acting reactive power controllers and dynamic devices like wind and solar. The Maritime Link HVDC is designed to avoid adverse interactions with thermal plants. Mitigation requires detailed studies and vendor collaboration.

System Strength Assessment in PSS®E EXISTING FAULT LEVEL ASSESSMENT MINIMUM SCMVA FOR SENSITIVE FACILITIES

AI summary The document discusses the existing fault level assessment and minimum short-circuit MVA (SCMVA) requirements for sensitive facilities within the context of system strength evaluation using PSS®E. The analysis focuses on technical parameters critical to grid stability and protection coordination.

Recommendations - Stable and Reliable Operation - o RoCoF review for existing plant - o TSIR and DSIR revision for high IBR - o Studies for each wave of change, IBR, plant retirements, load growth - Resource Planning, Update IBR and Inerti...

AI summary The document outlines recommendations for ensuring grid stability with high Inverter-Based Resources (IBR), including RoCoF reviews, system strength assessments, inertia constraint updates, real-time operational tools, and black start protocols for dual grids. It emphasizes planning practices for load growth and IBR integration.