FlexMeasures / flexmeasures / 29662786777

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Support intermediate power constraints on groups of devices (flex-model group field) (#2276)

* feat: support intermediate power constraints on groups of devices

Add a new `group` field to the storage flex-model, letting device entries
reference a power sensor that represents a group of devices (e.g. a hybrid
inverter shared by a battery and PV). The group sensor's own flex-model entry
constrains the group's aggregate power:

- power-capacity: hard constraint (both directions)
- consumption-capacity / production-capacity: soft constraints, enforced via
  breach commitments with default breach prices (10000 <currency>/kW)

The group's scheduled aggregate power is saved to the group sensor. Nested
groups are supported (cycles rejected); groups require multi-device
flex-models and members must share a commodity.

Implemented on top of the existing device-group solver machinery
(ems_constraint_groups from the multi-commodity work, and grouped
FlowCommitments from PR #1934); no changes to the optimizer itself.

Also fixes a latent device-index misalignment in MetaStorageScheduler._prepare,
where per-device lists were built from the full flex-model list (including
stock-only entries) instead of the filtered device models.

Closes #2092

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TAad46Ayg86DHpL6nY54sX

* docs: cite PR #2276 in changelog entry

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TAad46Ayg86DHpL6nY54sX

* feat: support intermediate power constraints on groups of devices

Add a new `group` field to the storage flex-model, letting device entries
reference a power sensor that represents a group of devices (e.g. a hybrid
inverter shared by a battery and PV). The group sensor's own flex-model entry
constrains the group's aggregate power:

- power-capacity: hard constraint (both directions)
- consumption-capacity / production-capacity: ... (continued)

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