ABB TCC300, Руководство пользователя, Страница: 535 / 716

• The ability of the DG to generate those amounts of VArs.
• The contractual obligations enforced by many utilities that the DG only affect KWs
on the system.
Smart Reverse Power (Auto Determination)
Due to the increased use and larger capacities of Distributed Generation, it is possible for
a regulator to see a reverse power condition requiring more than one reverse power mode
depending on the cause of the reverse power condition; either Distributed Generation
mode or Regulate In Reverse/Regulate in Reverse Measured. The TCC300 provides two
new reverse power modes, "Auto Determination" and "Auto Determination Measured"
which allow the control to intelligently choose which reverse power mode applies at the
time reverse power is sensed.
Auto Determination and Auto Determination Measured – This feature performs the
following sequence when reverse power is detected:
1. Distributed Generation Mode will be applied initially.
2. On the next tap operation, Load Voltage will be measured before and one second after
the tap (defined as 1 second after the operation counter has incremented either due to
a counter input or motor hold). The absolute magnitude value of this difference is
stored internally as the Tap Delta Voltage.
2.1. If the Tap Delta Voltage is greater than 0.4 Vac, the control stays in Distributed
Generation Mode and will behave normally in this mode with no further
measurements of Load Voltage needed.
2.2. If the Tap Delta Voltage is less than or equal to 0.4 Vac, the control increments
an internal counter designed to keep track of how many times the Tap Delta
Voltage is less than 0.4 Vac. The next tap operation will again measure Load
Voltage in the same manner. If the control sees two consecutive Tap Delta
Voltage measurements less than or equal to 0.4 Vac, the control changes from
Distributed Generation Mode to either Regulate Reverse if "Auto
Determination" has been selected, or Regulate Reverse Measured if "Auto
Determination Measured" has been selected.
2.3. If Tap Delta Voltage is greater than 0.4 Vac on the second tap operation, the
control does not increment the internal counter, and stays in Distributed
Generation Mode. The control will then measure Tap Delta Voltage on the next
tap. If that third tap has a Tap Delta Voltage greater than 0.4 Vac, then the
control remains in Distributed Generation Mode and the internal counter is
cleared. If the third tap has a Tap Delta Voltage less than or equal to 0.4 Vac, the
condition meets the requirements of 2b above and the control will respond
accordingly.
3. Once the control has determined which Reverse Power mode to apply using the
method described above, it will operate in that mode as long as Reverse Power is
detected.
1VAC388793-MB A
Section 7
Setpoints
TCC300 529
User Manual