Configure Controller - Woodward easYgen-2000 Series User Manual

4.5.12

Configure Controller

Proportional control
Integral control
Derivative
37535B
WARNING!
Hazards due to incorrect settings
The following parameters dictate how the easYgen
controls voltage, frequency, load and power factor.
Failure to do so may lead to incorrect measurements
and failures within the control unit resulting in damage
to or destruction of the generator and/or personal
injury or death.
– Always ensure that the correct settings are entered
in these parameters.
The Real load, reactive load, and process control all utilize PID
controllers. The response of each control loop can be adjusted for
optimum response, however it is important to understand what a
PID controller is and the effect of each controller adjustment has
on the controller response.
Proportional gain, integral gain (stability) and DR (speed derivative
ratio) are the adjustable and interacting parameters used to match
the response of the control loop with the response of the system.
They correspond to the P (proportional), I (integral), and D (deriva‐
tive) terms, and are displayed in the easYgen as follows:
P - Proportional gain (%)
I - Integral gain (%)
D - Derivative gain (determined by DR and I)
Proportional response is directly proportional to a process change.
Analogy: Setting hand throttle to keep constant speed on
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straight and level road.
Proportional control (using the same analogy) results in a certain
speed as long as the car is not subjected to any load change such
as a hill. If a throttle is set to any particular setting, the speed of the
car will remain constant as long as the car remains straight and
level. If the car goes up a hill it will slow down. Of course, going
down a hill the car would gain speed.
Integral compensates for process and setpoint load changes.
Analogy: Cruise control maintains constant speed regardless of
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hills.
Integral, sometimes called reset, provides additional action to the
original proportional response as long as the process variable
remains away from the setpoint. Integral is a function of the magni‐
tude and duration of the deviation. In this analogy the reset
response would keep the car speed constant regardless of the ter‐
rain.
Derivative provides a temporary over-correction to compensate for
long transfer lags and reduce stabilization time on process upsets
(momentary disturbances). The behavior of the derivative param‐
eter is shown in Fig. 96.
Analogy: Accelerating into high speed lane with merging traffic.
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easYgen-2200/2500 | Genset Control
Configure Application > Configure Controller
Configuration
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