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The IEEE1588 network time synchronization, matched with
smart substation information network transmission, is becoming
the next generation advanced data synchronization of the smart substation. It
is known that the inherent asymmetry error of the network synchronization
approach in the smart substation is highlighted, which is concerned particularly.
This paper models the synchronization process of the IEEE1588 based on the
communication simulation software of OPNET Modeler. Firstly, it builds the
models of master-slave clock, IEEE1588 protocol and network synchroniza- tion
model, and analyzes the composition and influencing factors of the asymmetry
error. Secondly, it quantitatively analyzes the influence of the synchronous
asymmetric error of the IEEE1588 affected by the network status differences and
the clock synchronization signal transmission path differences. Then its
correction method is analyzed, in order to improve the IEEE1588 synchronization
reliability and gives the solutions to its application in smart substation.
In this paper, the model of turbine governor based on the physical principles is constituted to improve the accuracy of
power system dynamic simulation, making the results of simulation consistent
with the actual situation. The unit and grid coupling model
which reflects the interaction between thermal system of
power plant and power system is built using EMTDC/PSCAD. The influence of nonlinear
characteristics on the valve opening and the steam turbine mechanical power is
also analyzed in this paper. The results of simulation show that the improper
setting of parameters reflecting nonlinear characteristics of turbine governor
can lead to the cyclical oscillations of the valve
opening and the steam turbine mechanical power, and
even can lead to the power oscillation persistently.
The research achievements in this paper have a certain reference value on
exploring the causes of power oscillation from the prime mover.