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Priority of control modes (Hybrid EMS)
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Note
The content on this page refers only to the blue'Log XC combined with the Hybrid EMS licence.
The blue’Log XC provides various active power management functions, most of which can operate simultaneously. When multiple functions run in parallel, they are executed in the following priority order (highest to lowest):
Prioritization of the active power management functions (with “Prioritzitation grid operator” activated)
1. Grid operator commands
The grid operator commands that refer to the plant level have the highest priority.
Prerequisite: The function Prioritzitation grid operator is activated. See Frequency control P(f).
2. Power limitation at grid connection point (GCP)
The active power limitation at GCP has the second-highest priority.
The limits configured on the user interface (feed-in and import limit) can be further restricted by the grid operator.
The frequency control functions (LFSM-U, LFSM-O, FSM) cannot violate the feed-in/import limits.
3. Limited Frequency Sensitive Mode (LFSM-U & LFSM-O)
The functions LFSM-U and LFSM-O are mutually exclusive: only one function can run at a time.
When frequency control is activated, all other control functions are ignored.
Exceptions:
Grid operator commands (if Priorization grid operator is activated).
Power limitation at the grid connection point.
4. Frequency Sensitive Mode (FSM)
LFSM-U and LFSM-O take priority over FSM.
During FSM, the grid operator can still curtail the active power, and the power limitation at the grid connection point is respected.
5. Energy trader commands
Energy trader setpoints have relatively low priority.
If setpoints from the energy trader and grid operator overlap, the lower value has priority.
Energy trader setpoints are entirely ignored during LFSM-O and LFSM-U events.
During FSM, the energy trader’s command is only considered if the base value was chosen as PRPC. See Frequency control P(f).
5. Energy Management System (EMS)
The energy management functions have lowest priority.
They are ignored during frequency events.
The grid operator can curtail the power output induced by the energy management system at any time.
Energy traders can overwrite the energy management commands.