blue'Log XM/XC
blue'Log XM/XC
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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):

Default priorization of the active power management functions
Default priorization of the active power management functions

1. Grid operator commands

  • The grid operator commands that refer to the plant level have the highest priority.

  • No functions can exceed the power limits set by the grid operator.

  • Exception: function “Ignore grid operator is activated. See Frequency control P(f).

  • Prerequisite: The toggle Ignore grid operator command is deactivated (default setting). 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, the power follows the P(f) curves.

  • The power can be limited by the following functions:

    • Grid operator commands for feed-in and import limitation.

    • Grid operator command for limitation of PV power and charge/discharge power (only if the toggle Ignore grid operator command is deactivated. See Frequency control P(f).)

    • Power limitation at grid connection point.

  • Exceptions:

    • Grid operator commands (only if the toggle Ignore grid operator command is deactivated).

4. Frequency Sensitive Mode (FSM)

  • LFSM-U and LFSM-O take priority over FSM.

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.