Setting Load Shedding in a Multicluster System


The basic procedure for changing operating parameters is explained in another section Changing Operating Parameters).

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The load contactor in the Multicluster-Box is a load-shedding contactor and is controlled depending on the state of charge of the batteries.

Significance of the SOC thresholds:

When the state of charge of a battery reaches the lower SOC threshold, the load contactor is opened. The state of charge of the battery of the main cluster and the states of charge of the batteries of the extension clusters are evaluated. The load contactor disconnects the loads from the stand-alone grid. When the state of charge of all batteries reaches the upper SOC threshold during recharging, the load contactor closes. The load-shedding contactor connects the loads to the stand-alone grid.

Procedure:

  1. Select Device > Load shedding 1.
  2. Set the parameter Limit of battery state of charge for start to the lower SOC threshold.
  3. Set the parameter Limit of battery state of charge for stop to the upper SOC threshold. The upper SOC threshold must be at least 10 percentage points above the lower SOC threshold.
  4. Select Device > Load shedding 1 > Additional time range >.
  5. Set the parameter Time load shedding 1 and the parameter Start time additional time range load shedding 1 each to the same value, e.g. to 00:00:00. This will switch the time-dependent load shedding off.
  6. If the off-grid system is a multicluster system, ensure that the parameter of the multifunction relay is set to Load shedding in Multicluster Setting the Functions of the Multifunction Relays).