Grid data acquisition
The EtherCAT Terminals for grid data acquisition tested as part of the certification process are listed below (see also Components):
Component | Description |
|---|---|
EL3453 EL3453-0100 | EtherCAT Terminal 130 / 690 V AC, 1 / 5 A, 24 bits
|
EL3783 EL3783-0100 | EtherCAT Terminal 130 / 690 V AC, 1 / 5 A, 16 bits, 20 ksps
|
A TwinCAT Power Measure module from the TF8330 | TwinCAT Power Collector or the TF8360 | TwinCAT Power Technologies is used for the acquisition and calculation of grid data. These modules are used in connection with EtherCAT Terminals for grid data acquisition.
- EL3453: The grid data of the EL3453 terminal is retrieved via the
TcPowerMeasureEL3453module. In this case, grid analyses and evaluations of the measured voltages and currents are carried out directly in the EtherCAT Terminal. The results are taken from the TwinCAT Power Measure.
See also TcPowerMeasureEL3453. - EL3783: The grid data of the EL3783 terminal is read via the
TcPowerMeasureEL3783module. The terminal provides instantaneous values of voltages and currents, which are then evaluated by the TwinCAT Power Measure.
See also .
The standard variants of the EL3453 and EL3783 are used for direct measurement in the low-voltage network up to 690 V. The -0100 variants of both terminals are optimized for use with voltage transformers and enable the measurement of medium or high voltage via their 100 V secondary side. Technically, they only have different input wiring, while the firmware and software for processing the measured values are identical.
For the use of TwinCAT Power Plant Control as a PGP controller in extra-high voltage grids, the EL3783 with the TcPowerMeasureEL3783 must be used in order to meet the higher requirements.
The TF8330 licenses for integrating the EL3453 using the TcPowerMeasureEL3453 module are included in the TF8360 license. To integrate the EL3783 using the TcPowerMeasureEL3783 module, the TF8350 license must also be purchased.
The data of the respective TcPowerMeasure module is transferred via an interface pointer directly into the TcPowerPlantControl, without the detour via the explicit mapping of inputs and outputs of the process data. The measured values are transferred to the controller in SI units. For further internal processing, the controller scales these values into the per-unit representation (pu) to enable a normalized evaluation relative to the respective nominal value.
The controller uses the symmetrical three-phase average value U123 for voltage control. The phase-to-phase voltages U12, U23 and U31 are used to monitor the connection conditions during the Restart and Reconnect operating states. To calculate the active and reactive power, the controller uses the fundamental values of the fundamental as signed total power across all three phases.
External devices for grid data acquisition
If external devices other than the supported EtherCAT Terminals are used for grid data acquisition, the measured values must meet the following requirements and be made available to TwinCAT Power Plant Control in a suitable form.
Measured value | Accuracy | Update rate |
|---|---|---|
Voltage | ≤ 1.0 % | ≤ 100 ms |
Current | ≤ 1.0 % | ≤ 100 ms |
Power | ≤ 1.0 % | ≤ 100 ms |
Frequency | ≤ 10 mHz | ≤ 100 ms |
The use of the PGP controller in extra-high voltage grids is subject to extended requirements for grid data acquisition. These must be taken into account when selecting and connecting external devices for grid data acquisition.
Measured value | Accuracy | Update rate |
|---|---|---|
Voltage | ≤ 0.5 % | ≤ 100 ms |
Current | ≤ 0.5 % | ≤ 100 ms |
Power | ≤ 0.5 % | ≤ 100 ms |
Frequency | ≤ 5 mHz | ≤ 100 ms |