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This paper demonstrates a risk-based framework that can be used to establish operational constraints of power systems. The application of this methodology is illustrated on the areas of small disturbance stability and sub-synchronous resonance (SSR) in order to determine risk levels associated with various operating regions (conditions). By visualizing these risk areas, guidance for planning and operation...
This paper presents a risk-based framework to establish operational constraints for modern power systems. The methodology is established and subsequently applied to two areas of power system analysis - small-disturbance stability and sub-synchronous resonance (SSR). In the first case, probability density functions (pdfs) for critical oscillatory electromechanical modes are established based on the...
The paper presents analysis of the torsional torques of a turbine generator rotor system in a meshed AC network with monopolar HVDC link following symmetrical and asymmetrical faults. The emphasis of the work is on establishing the influence of uncertainties in the mechanical parameters of turbine-generator shaft system on maximum torsional torques. Three loading conditions of turbine generator are...
This paper presents a comparison of torsional torques in the shafts of multi stage steam turbines in meshed AC networks, as well as, in networks that employ HVDC lines in parallel to existing AC transmission corridors. A full multi stage turbine model, a four machine meshed AC system and a HVDC system have been developed in DigSilent. The mechanical parameters of turbine-generator shaft system are...
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