Deif PPU 300 - Tuning Governor Regulators; Tuning for Frequency Regulation; Tuning for Frequency Synchronisation

In general, for tuning the controllers, a slow response is better than a fast, unstable response.
The default PID settings for analogue-controlled regulators are sensitive, and normally need adjustment:
1. You must have already adjusted the analogue control parameters.
2. Deactivate switchboard control, and use the controller for regulation.
3. Adjusting the gain, Kp:
a. Set Ti and Td to 0, to ensure that the PID control has no integral or derivative contribution.
b. Use the method described above to increase Kp until a satisfactory stable response is reached.
4. Adjusting the integral value, Ti:
a. Increase Ti to a high value, for example, 30 s, and write the new parameter to the controller.
b. Create a change in the system and check whether the control response is still stable. If not, increase Ti to an even
higher value, until the control response to a load change is stable.
c. Use an adjusted method, similar to the one described above, to decrease Ti until a satisfactory stable response is
reached.
5. Adjusting the derivative value, Td:
a. Use the method described above to increase Td until a satisfactory stable response is reached.
6. Overall evaluation:
a. Test changes (both increases and decreases) and check whether the control response is still stable.
b. If the control response is not stable, adjust Kp, Ti and Td again.
INFO
The derivative parameter, Td, is not required by every system. A correctly tuned Kp and Ti may be enough. If Td is
not optimal, then the regulation may be worse than if there was no Td.
6.4 Tuning governor regulators
6.4.1 Tuning for frequency regulation
To tune the frequency regulation, the genset must be the only equipment that is connected to the busbar.
Tune the frequency regulation using the Tuning P regulation procedure for relay outputs, and Tuning PID regulation for
analogue outputs.
Create frequency changes during tuning as follows:
1. Activate switchboard control.
2. Use the switchboard GOV up or GOV down controls to increase or decrease the frequency by 1 Hz.
3. Deactivate switchboard control, and observe the response of the frequency. How long does it take the controller to return
to the nominal frequency? How many overshoots are there? How large are the overshoots? Use the observation to tune
the regulator.
6.4.2 Tuning for frequency synchronisation
To tune the frequency synchronisation, the genset breaker must be open, and there must be voltage on the busbar.
Tune the frequency synchronisation using the Tuning P regulation procedure for relay outputs, and Tuning PID regulation
for analogue outputs.
PPU 300 Commissioning guidelines 4189341106 UK
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