IEEE TUTORIAL
DYNAMIC PARAMETER TUNING BASED UPON SYSTEM TRANSIENT RESPONSE
Dr. Farrokh Shokooh (Fellow, IEEE)
Dr. J J Dai (Member, IEEE)
Operation Technology, Inc.
Abstract
Knowledge of a synchronous machine and its associated control system dynamic
parameters is essential to power system transient stability simulation studies.
These
parameters include synchronous machine impedances and time constants on d and q axis,
machine inertial and damping coefficients, generator prime mover and governor
parameters, excitation system and AVR parameters, Power System Stabilizer (PSS)
parameters, motor load characteristic curve parameters, etc. Accuracy in these parameters
directly affects credibility of the simulation results. This tutorial starts with descriptions of
dynamic behavior of some common transfer functions used in dynamic modeling with
respect to their parameters. A standard synchronous generator dynamic model and its
response to a disturbance as a function of model parameters are discussed and illustrated
graphically next.
It is followed by a real system project example, which involves a
generator start-up and motor re-start. Effectiveness of the dynamic parameter tuning
technique is demonstrated by comparison between the field measured data and transient
stability simulation results with tuned parameters. A very close correlation between two
sets of data is achieved. More examples of using dynamic parameter tuning to obtain a set
of machine parameters with confidence are presented by a diesel generator load acceptance
test and a short-circuit test. In all examples, machine parameters are tuned to successfully
match the field testing results both in RMS values and instantaneous values.