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If by virtual inertia you mean a fast, unit-level active power response to off-nominal frequency, it doesn't appear that any of the WECC unit-level models in version 34 have this.
If by virtual inertia you mean grid-forming, WECC has approved two models for this: REGFMA1 & REGFRMB1. It looks like REGFMA1 is available in later versions of PSS/E, but I dont have these so can't provide the details. REGFMB1 was just approved by WECC last week, so hopefully it will be added to PSS/E soon.
