OBJECTIVE: At the end of the course, the students will be able to model the power systems for static and dynamic stability studies.
Dynamic modelling requirements - voltage and angle stability - equal area criterion - effect of damper winding - effect of AVRs and Governors - Critical fault clearing time and angle - numerical integration techniques.
Park's transformation - flux linkage equations - formulation of normalised equations - state space current model - subtransient inductances and time constants - simplified models of the synchronous machine - turbine, Generator - steady state equations and phasor diagrams - calculation of machine parameters from manufacturing data.
Mechanical relationships - electrical transient relationships - saturation in synchronous machines - adjustment of machine models - Park's equation in the operational form.
Induction motor equivalent circuits and parameters - free acceleration characteristics - dynamic performance - changes in load torque - effect of three phase short circuit - effect of unbalanced faults.
Transient and dynamic stability distinction - system response to small disturbances - linear model of unregulated synchronous machine and its oscillation modes - regulated synchronous machine - distribution of power impacts - effects of excitation on stability - supplementary stabilisation signals.
