Nomenclature
TwinCAT Power Plant Control is integrated as a controller kernel via several interfaces of the TwinCAT module. Operating states, control commands and setpoints are transferred via these interfaces, and control states, control values and diagnostic information are read. The data points in the respective interfaces are structured into categories and are described using the following terms.
Name | Description |
|---|---|
Target(s) | Process data input for specifying setpoints of the application to the controller. |
Control | Process data input for transferring application states and commands to the controller. |
Demand(s) | Process data output for the output of the controller control values. |
Status | Process data output for the output of the controller operating states. |
Diagnostic(s) | Process data output for the output of internal controller variables for diagnostics. Is added to the Process data output module in TwinCAT via Module tab->Data Area. Internal controlled variables are output in [pu] scaling. |
Measure(s) | Process data input for grid data acquisition. Can be added to the process data of the module in TwinCAT via the Data Areas. The controller requires an average voltage value U123 over 3 phases and a total active and fundamental reactive power value with sign. |
Operating state | Internal operating state of the controller. Indicated by flags in Status |
(e)ActiveMode | Operation mode of the active power controller |
(e)ReactiveMode | Operation mode of the reactive power controller |
Active Power Control | Active power controller of the TcPowerPlantControl module |
Reactive Power Control | Reactive power controller of the TcPowerPlantControl module |
Fallback Control | A FallbackMode configures the behavior of the controller if communication with the energy provider fails, if communication with the direct marketing company fails, if communication with the power generating plant fails or if grid data acquisition fails. |
Persistent Control | File-based storage and restoration of the last valid setpoints and parameters of a TcPowerPlantControl or a TcPowerMeasure module. |
Overexcited operation | A positive reactive power (direction from the power generating plant to the grid) increases the voltage at the point of common coupling of the power generating plant. OvExt is used as an abbreviation for parameters and process data. The controller requires setpoint and actual values with a sign in order to correctly map the underexcited and overexcited operation in the power generating plant (see Reference arrow system). |
Underexcited operation | A negative reactive power (direction from the grid to the power generating plant) reduces the voltage at the power generating plant. UdExt is used as an abbreviation for parameters and process data. The controller requires setpoint and actual values with a sign in order to correctly map the underexcited and overexcited operation in the power generating plant (see Reference arrow system). |