Adjustment; Adjusting Pi Controller - Deif Multi-line 2 General Manuallines For Commissioning

Multi-line 2
The adjustment of the unit can be carried out when the initial settings of the governor and the AVR
are made.
The controller of the unit is a PI controller.
The unit includes different controllers which must be tuned in at the correct running situations (see
table below):
Controller
Frequency controller
Power controller
Voltage controller
var controller
Before the PI controllers of the multi-line 2 are tuned in, the values of the K
controllers must be decreased to a low value.
Start by tuning in the K
in following a few general rules as given below.
Step 1, adjustment of the K
Only the P regulator is to be active, and the operation of the gen-set must be stable. Now
increase the K factor step by step, until the gen-set becomes unstable. Adjust the K
P
50% of the value found above.
Step 2, adjustment of the K
Step by step increase the K
50...70% of the value found above.
Step 3, readjustment of controller settings
It can be necessary to make a readjustment of the controller settings, if during testing the gen-
set turns out to be unstable to some extent. If this is the case, then adjust the K
the operation is satisfactory.
To see the effect of the new adjustments when tuning in the multi-line 2,
remember to make a regulation deviation, e.g. by applying a load jump.
DEIF A/S

8. Adjustment

Purpose
Controls the frequency when the
multi-line 2 is in island mode
(stand-alone or load sharing).
Controls the power when the
multi-line 2 is running parallel to
the mains and when running in
load sharing mode.
Controls the voltage when the
multi line 2 is in island mode
(stand-alone or load sharing).
Controls the vars when the
multi-line 2 is running parallel to
the mains and when running in
var sharing mode.

Adjusting PI controller

factor, and then tune in the K
P
P
I
value, until the gen-set becomes unstable. Adjust the K
I
General Guidelines for Commissioning
Tune in conditions
Tune in when the generator
is running with the generator
breaker open.
Tune in when the generator
is running parallel to the
mains or in load sharing
mode.
Tune in when the generator
is running with the generator
breaker open.
Tune in when the generator
is running parallel to the
mains or in load sharing
mode.
factor. Normally, the controllers are tuned
I
and K of all
P I
factor to
P
factor to
I
and/or K , until
P I
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