Abstract
The paper presents a modified classic dynamic model of synchronous generator connected to infinity bus. The model allows to use dynamic models of excitation systems containing field voltage and field current inputs for investigation of electromechanical transient processes of power system. This model was used for analysis of dynamic characteristics of synchronous generator with increased frequency excitation system according to small perturbation and eigenvalues methods. The influence of parameters of external electrical network on quality of transient processes is estimated. The transfer function of the synchronous generator with increased frequency excitation system is explored according to eigenvalues analysis method. According to the suggested methodic, stability margins of Lithuanian power plant are evaluated for different operating conditions of the generator.DOI: http://dx.doi.org/10.5755/j01.eee.19.4.2578
Highlights
The quality of fast electromechanical transient processes control in power systems mostly depends on proper operation of excitation systems and automatic voltage regulators of synchronous machines
Where ω0 and ∆ω are the generator rotor synchronous angular speed and speed deviation; ∆δ is the rotor angle deviation; ∆Tm and ∆Te are the mechanical and electrical torque deviations; ∆ψfd is the field flux deviation; ∆Et and ∆Efd are the generator terminal voltage and field voltage deviations; ∆uC is the automatic excitation control input signal deviation; H is the generating unit inertia constant; DS is the load damping coefficient; Gex,u and Gex,i are the components of the excitation system transfer function; ∆VREF is the excitation reference signal deviation; ∆ifd is the generator field current deviation; K1, K2, K3, T3, K4, K5 and K6 are the parameters dependent on generator operating conditions and external electrical network impedance [3]; TR is the time constant of the terminal voltage transducer
The modified classic dynamic model of the synchronous generator connected to the infinitive bus is suggested for use of more complex dynamic models of excitation systems with field voltage and field current inputs
Summary
The quality of fast electromechanical transient processes control in power systems mostly depends on proper operation of excitation systems and automatic voltage regulators of synchronous machines. Where ω0 and ∆ω are the generator rotor synchronous angular speed and speed deviation; ∆δ is the rotor angle deviation; ∆Tm and ∆Te are the mechanical and electrical torque deviations; ∆ψfd is the field flux deviation; ∆Et and ∆Efd are the generator terminal voltage and field voltage deviations; ∆uC is the automatic excitation control input signal deviation; H is the generating unit inertia constant; DS is the load damping coefficient; Gex,u and Gex,i are the components of the excitation system transfer function; ∆VREF is the excitation reference signal deviation; ∆ifd is the generator field current deviation; K1, K2, K3, T3, K4, K5 and K6 are the parameters dependent on generator operating conditions and external electrical network impedance [3]; TR is the time constant of the terminal voltage transducer. The transfer function (8) of the increased frequency excitation system is added to the composed HPM model (1)–(7) in order to investigate the generating unit’s dynamic characteristics. STABILITY ANALYSIS OF SYNCHRONOUS GENERATOR WITH INCREASED FREQUENCY EXCITATION SYSTEM
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