EMT models & grid-code compliance, done once — done right.
For generators, inverter and OEM manufacturers and developers connecting to the GB system — we build the validated models and run the compliance evidence the connection now legally requires.
In GB, an EMT model is no longer optional.
Under the GB Grid Code (PC.A.9, introduced through GC0141), every new grid-connected generator and inverter-based resource above the small-power threshold must provide a validated three-phase EMT model and demonstrate compliance before it can energise — and NESO can require models and evidence from existing owners too. For converter-dominated plant that means proving fault ride-through, fast fault current injection and freedom from sub-synchronous oscillation, not just steady-state behaviour. Miss it and the connection stalls.
The whole compliance package — under one roof.
We build the models and run every mandated study, structured exactly the way the model checklist expects — so the review passes with the fewest possible iterations.
Stay connected through the dip — and feed the grid.
The GB Grid Code requires plant to ride through voltage dips along a defined envelope and inject fast fault current while it does. We set up the ECP.A.3.5.1 dip cases in EMT, demonstrate the plant stays above the boundary, and plot the reactive current delivered at the point of connection — the evidence the connection review needs.
Catch the oscillation before the grid does.
For inverter-based plant, sub-synchronous oscillation is the risk no fundamental-frequency study reveals. We measure the plant's dq impedance with an active frequency scan, flag every band with a negative real part, and resolve the eigenvalue stability of the grid×plant interaction.
We did exactly this on a real ~40 MW battery — full impedance scan, eigenvalue Nyquist and time-domain injection, all stable across the band.
Model to approval, in four moves.
Build / audit the model
We build your EMT and RMS models — or audit and fix a vendor model — to the structure the checklist demands, encrypted blocks documented.
Run the mandated studies
Fault ride-through, FFCI, voltage injection, reactive capability and frequency response — each case set up and plotted for review.
SSO screening
Active impedance scan and eigenvalue stability across 1–500 Hz, corroborated by time-domain injection.
Validate & submit
Model verification and validation reports — factory, type-test and on-site cross-referencing — packaged for the operator.
We work for the generator, the inverter manufacturer and the developer — the people who have to deliver the model. Same team builds it, studies it and signs off the evidence.
Real compliance projects, start to sign-off.
Two recent GB engagements — an inverter-based connection study and a generator re-compliance — show the same end-to-end package in action.
~40 MW BESS · SSO screening
Sub-synchronous oscillation screening for a grid-connected battery — PSCAD/EMTDC injection tests and an MHI impedance scan, proving stable, well-damped behaviour across 1–500 Hz.
View the case study →Generator · controls changed
A synchronous generator that modified its controls and had to re-demonstrate Grid Code compliance — full EMT model rebuilt (machine, excitation, stabiliser, protection) and field-validated against measurements.
View the case study →