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About fail-safe operation for reactive power
Fail-safe operation prevents a power plant system from entering an undefined operation mode in the event of a communication error.
You can configure fail-safe operation for reactive power to determine the behavior in case of:
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Communication failure with the grid operator or setpoint
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Communication failure with a meter
You can configure plant behavior for each type of communication failure. The error behavior is only activated after a user-defined waiting time has elapsed for each type of failure.
Communication failure with the grid operator or setpoint
When reactive power control uses a setpoint command mode (see Reactive power), the bluelog Neo relies on receiving the setpoint from the grid operator.
A communication failure between the grid operator and the bluelog triggers fail-safe operation.
The Qsetpoint is now determined based on the error behavior mode you have configured. The following modes are available:
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Default setpoint: Define a default value of the Qsetpoint (absolute or relative)
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Hold last setpoint: Maintain the last received Qsetpoint
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Q(V): See Characteristic curve Q(V).
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Q(P): See Characteristic curve Q(P).
The remaining components of the Q controller (control value determination and control value dispatch) continue to operate as usual.
Communication failure with a meter
To perform reactive power control, the bluelog relies on measured data from a connected meter.
If the meter fails or communication to it is lost, the bluelog will enter the configured error behavior.
Since the feedback signal from the grid connection point is no longer available, the bluelog always switches to open-loop operation and applies the configured error behavior as the control value.
There are two options for the error behavior:
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Default value: Define a default control value
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Hold last value: Retain the last calculated control value
The remaining component of the Q controller (control value dispatch) continues to operate as usual.
Note
Communication failure between master and slave
In a master-slave setup, the bluelog Neo master sends the error behavior that has been configured for meter failure cyclically to the bluelog Neo slave.
When a communication failure between the master and slave occurs, the slave adopts the error behavior and acts accordingly.
Configure fail-safe operation
Prerequisites
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bluelog Neo with a Battery, or Hybrid control license
Steps
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Go to Power control > Rective power > Fail-safe operation.
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Under Setpoint failure, select the desired error behavior for the plant.
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If you selected Default setpoint, enter the Fallback value as a percentage.
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Enter a Waiting time in seconds. The default is 60 seconds.
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Under Meter failure, select the desired behavior for the plant.
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If you selected Default value, enter the Fallback value as a percentage.
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Enter a Waiting time in seconds. The default is 5 seconds.
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Select Save.
The error behavior is configured.