Stability Tuning; Avr Mode - Basler DECS-250 Instruction Manual

Stability Tuning

Generator stability tuning in the DECS-250 is achieved through the calculation of PID parameters. PID
stands for Proportional, Integral, Derivative. The word proportional indicates that the response of the
DECS-250 output is proportional or relative to the amount of change observed. Integral means that the
DECS-250 output is proportional to the amount of time that a change is observed. Integral action
eliminates offset. Derivative means that the DECS-250 output is proportional to the required rate of
excitation change. Derivative action avoids excitation overshoot.

AVR Mode

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HMI Navigation Path: Settings, Operating Settings, Gains, AVR Gains
Two sets of PID settings are provided to optimize performance under two distinct operating conditions,
such as with the power system stabilizer (PSS) in or out of service. A fast controller provides optimum
transient performance with the PSS in service while a slower controller can provide improved damping of
first swing oscillations the PSS offline. BESTCOMSPlus primary and secondary AVR stability settings are
shown in Figure 96.
Predefined Stability Settings
Twenty predefined sets
implemented based on the nominal generator frequency selected (see the Configuration section of this
manual) and the combination of generator (T'do) and exciter (Texc) time constants selected from the gain
option list. (The default value for the exciter time constant is the generator time constant divided by six.)
Additional settings are available to remove the effects of noise on numerical differentiation (AVR
derivative time constant Td)
Custom Stability Settings
Stability tuning can be tailored for optimum generator transient performance. Selecting a primary gain
option of "custom" enables entry of custom proportional (Kp)
When tuning the stability gain settings, consider the following guidelines
If the transient response has too much overshoot, decrease Kp. If the transient response is too slow,
•
with little or no overshoot, increase Kp.
• If the time to reach steady-state is too long, increase Ki.
• If the transient response has too much ringing, increase Kd.
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All stability tuning must be performed with no load on the system or
equipment damage may occur.
® Navigation Path: Settings Explorer, Operating Settings, Gain, AVR
A of stability settings are available with the DECS-250. Appropriate PID values are
B and set the voltage regulator gain level of the PID algorithm (Ka)
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Caution
D , integral (Ki)
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C .
E , and derivative (Kd) F gains.
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