PSCAD Modeling & Studies for Grid Interconnection and Compliance

RMS tools like PSS/E and TSAT work well for large-system planning, but they average out the fast control behavior of power electronics. Solar, wind, BESS, and large power-electronic loads such as AI data centers respond in milliseconds. EMT simulation captures that behavior, which you need for:

• Weak-grid (low short-circuit strength) performance
• Sub-synchronous oscillations near series-compensated lines (SSR/SSCI)
• Control interactions between nearby plants, HVDC, or FACTS devices
• Ride-through and protection performance

NERC recommends EMT studies in exactly these situations, and ISOs increasingly require them.

Requirements are tightening across the board:

• ERCOT requires PSCAD models and model quality tests (MQTs) for IBRs and is now extending EMT model requirements to large loads and data centers.
• PJM requires a PSCAD model for projects moving past Decision Point II.
• MISO and other FERC-jurisdictional regions collect EMT models under FERC Order 2023.
• NERC has put revised model verification requirements in effect, and further EMT standards are in development.

It depends on scope and how good the vendor models are. A standard plant model build and MQT package typically takes a few weeks. Larger work, such as SSR/SSCI screening, weak-grid studies, or islanded data center studies, takes longer. Our automated test and post-processing workflows cut down the time spent on repeated runs, so we can turn studies around faster and absorb late design changes without starting over.

Yes. NERC expects transmission planners to use objective, risk-based screening to decide when EMT studies are needed. Typical triggers are:

• Low system strength
• High IBR concentration
• Series compensation
• Nearby HVDC/FACTS
• Large data center loads

We help utilities set those screening criteria and EMT model requirements. We also review developers' PSCAD submittals for quality and how well they match the real equipment. For larger studies, we build multi-plant, area-level EMT models from your planning cases to evaluate plant-to-plant interactions, oscillations, weak-grid stability, and large-load ride-through. Those are the risks a single-plant study can't show.

Most of it already exists in your interconnection package. Typically we ask for:

• Single-line diagram and plant layout: the main power transformer(s), collector system, and reactive devices
• OEM PSCAD models: for the inverters or turbines, the plant controller, and any STATCOM or BESS, with the model version, user guides, and the site-specific parameter settings
• Your PSS/E model: the power flow and dynamic models, so we can benchmark the PSCAD model against them
• Equipment data: transformer impedances, X/R ratios, and tap settings; collector cable lengths and impedances; and protection and ride-through settings
• Grid data at the point of interconnection: short-circuit levels or a system case from the ISO or utility, plus the study scope or model requirements they've specified

For data center and large-load studies, we also need: the load composition, UPS and power electronics details, and any on-site generation.

We'll send you a tailored data request checklist at kickoff. Gaps don't have to hold up the start. We flag what's missing, use typical values with documented assumptions where it's appropriate, and work directly with your OEM to get the right models.

INS engineers have deep EMT experience, including OEM-side work on SSR/SSCI analysis and control design. We pair that with automation and AI-assisted workflows for building cases, running batches, and reviewing results. You get faster turnaround, consistent and well-documented results, and a team that stays with you through ISO review and model updates.