Energy domain⏱ ~1 minEU

IGM

Individual Grid Model Individuell nettmodell

The individual grid model - one TSO's description of its own area, and the building block that is merged with the others into a common grid model.

Definition

IGM (Individual Grid Model) is the data set describing the power system within a single control area: generation, load and grid topology. Every TSO is obliged to build its own, and the model is that TSO's contribution to the common grid model. Models are produced for several time horizons - from a year ahead down to the day before and within the operating day - and they are hourly, so each hour of a day has its own model. In the Nordics the models are submitted to the Nordic RCC, which validates them before they are merged. That validation is not a formality: a model that fails to converge in power-flow calculation, or that does not agree with the neighbouring area's model at the interfaces, cannot simply be folded into the merge. The obligation is grounded in the System Operation Guideline, which among other things requires each TSO to build a year-ahead model for each bidding zone.

In practice

In practice the relationship between IGM and CGM is that of part to whole, and it is worth holding on to when reading requirement documents: a party submits an IGM, whereas a CGM comes into being from many IGMs. The quality of the common model can never exceed the quality of the individual ones, which is why much of the work sits in validation and reconciliation against neighbours rather than in the merge itself. The format is CGMES, which splits the model into profiles with distinct responsibilities - and it is precisely that split which makes it possible to submit an updated operational state without resending the entire equipment model. As with CGM, this is the TSOs' domain rather than the grid companies'.

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IGM

Definition

In practice

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