Adjustment; Adjustment Overview; Overview; Adjusting Pid Controller - Deif AGC 200 Series General Manuallines For Commissioning

General guidelines for commissioning
4189340703 UK

8. Adjustment

8.1 Adjustment overview

8.1.1 Overview

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 PID controller.
The unit includes different controllers which must be tuned in at the correct running situations (see the table
below):
Controller Purpose
Frequency con- Controls the frequency when the Multi-line
troller 2 is in island mode (stand-alone).
Power controller Controls the power when the Multi-line 2 is
running with fixed power/base load.
P load share con- Controls the power when the Multi-line 2 is
troller running in load sharing mode.
Voltage controller Controls the voltage when the Multi-line 2
is in island mode (stand-alone).
Reactive power Controls the VAr when the Multi-line 2 is
controller running with fixed VAr load.
Q load share Controls the reactive power when the Mul-
controller ti-line 2 is running in load sharing mode.

8.2 Adjusting PID controller

8.2.1 PID controller

Before the PID controllers of the Multi-line 2 are tuned in, the values of the K
must be decreased to a low value.
Start by tuning in the K
p
a few general rules as given below.

8.2.2 Step 1, adjustment of the KP

Only the P regulator is to be active (Td and Ti set to 0 s), and the operation of the genset must be stable. Now
increase the K factor step by step, until the genset becomes unstable. Adjust the K
p
value found above.

8.2.3 Step 2, adjustment of the Ti

With the K setting set to the value found in step 1, raise the Ti to a high value, e.g. 30 s, and decrease Ti
p
step by step, until the genset becomes unstable. Adjust the Ti to approx. 1.5-1.7 times the value where insta-
bility begins.

8.2.4 Step 3, adjustment of the Td

Step by step increase the Td until the genset becomes unstable. Adjust the Td to 50...70% of the value.
DEIF A/S
factor, and then tune in the Td and Ti. Normally, the controllers are tuned in following
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.
Tune in when the generator is running 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.
Tune in when the generator is running in
reactive load sharing mode.
, Ti and Td of all controllers
p
factor to 50% of the
p
Adjustment
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