Deif Multi-line 2 General Guidelines For Commissioning

Multi-line 2 General Guidelines for Commissioning
DEIF A/S Page 16 of 19
8. Adjustment
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 Purpose Tune in conditions
Frequency controller Controls the frequency when the
multi-line 2 is in island mode
(stand-alone or load sharing).
Tune in when the generator
is running with the generator
breaker open.
Power controller Controls the power when the
multi-line 2 is running parallel to
the mains and when running in
load sharing mode.
Tune in when the generator
is running parallel to the
mains or in load sharing
mode.
Voltage controller Controls the voltage when the
multi line 2 is in island mode
(stand-alone or load sharing).
Tune in when the generator
is running with the generator
breaker open.
var controller Controls the vars when the
multi-line 2 is running parallel to
the mains and when running in
var sharing mode.
Tune in when the generator
is running parallel to the
mains or in load sharing
mode.
Adjusting PI controller
Before the PI controllers of the multi-line 2 are tuned in, the values of the K
P
and K
I
of all
controllers must be decreased to a low value.
Start by tuning in the K
P
factor, and then tune in the K
I
factor. Normally, the controllers are tuned
in following a few general rules as given below.
Step 1, adjustment of the K
P
Only the P regulator is to be active, and the operation of the gen-set must be stable. Now
increase the K
P
factor step by step, until the gen-set becomes unstable. Adjust the K
P
factor to
50% of the value found above.
Step 2, adjustment of the K
I
Step by step increase the K
I
value, until the gen-set becomes unstable. Adjust the K
I
factor to
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
P
and/or K
I
, until
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 Multi-line 2 Specifications

General

Brand	Deif
Model	Multi-line 2
Category	Controller
Language	English