The basic function of an Excitation system is to provide direct current to the synchronous machine field winding. It also performs CONTROL and PROTECTIVE FUNCTIONS essential to the satisfactory performance of the power system by controlling the field voltage and thereby the field current.
•The detail of the model required depends on the purpose of the study.
•Referring to the figure below the control and protective features that impact on the transient and small signal stability studies are the voltage regulators, power system stabilizer, excitation control stabilization.
•The limiter and protective circuits identified in the figure normally need to be considered only for the mid term,long,and voltage stability studies.
•Some excitation systems are provided with fast acting terminal voltage limiters in conjunction with power system stabilizers.
•These have to be modeled in transient stability simulations.
The Modeling(Mathematical Model) is divided into three parts:
Modeling of Excitation Systems
•Mathematical models of Excitation systems are essential for the assessment of desired performance requirements ,for the design and coordination of supplementary control and protective circuits, and for system stability studies related to the planning and operation of power systems.•The detail of the model required depends on the purpose of the study.
•Referring to the figure below the control and protective features that impact on the transient and small signal stability studies are the voltage regulators, power system stabilizer, excitation control stabilization.
•The limiter and protective circuits identified in the figure normally need to be considered only for the mid term,long,and voltage stability studies.
•Some excitation systems are provided with fast acting terminal voltage limiters in conjunction with power system stabilizers.
•These have to be modeled in transient stability simulations.
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- Model of Amplifier
- Model of Exciter
- Model of Generator
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