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Steady state applications

Steady state applications

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Modelling of voltage sags and voltage interruptions requires accurate representation of the dynamic characteristics of the main system components, particularly the synchronous generators and induction motors, power electronic equipment and their protection and control. The EMT programs meet all these requirements adequately and can thus be used with confidence in the simulation of sag characteristics, their effects and the role of sag compensation devices. Subject to the unpredictability of the arc furnace characteristics, EMT simulation with either deterministic or stochastic models of the arc behaviour can be used to investigate possible mitigation techniques. Flicker penetration can also be predicted with these programs, although the derivation of the IEC short and long-term flicker indices is currently computationally prohibitive. However, real-time digital simulators should make this task easier.

Inspec keywords: real-time systems; IEC standards; power electronics; arc furnaces; induction motors; synchronous generators; flicker noise; power supply quality

Other keywords: IEC short flicker; deterministic models; flicker penetration; dynamic characteristics; steady state applications; power electronic equipment; voltage interruptions; induction motors; stochastic models; long-term flicker; real-time digital simulators; synchronous generators; voltage sags; mitigation techniques; arc furnace; EMT programs

Subjects: Power supply quality and harmonics

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