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Modeling and real time simulation of an HVDC inverter feeding a weak AC system based on commutation failure study
Mohamed Mankour1, Mounir Khiat1, Leila Ghomri2
1Department of Electrical Engineering, Laboratory SCAMRE (Simulation, Commande, Analyse et maintenance des réseaux électriques), Polytechnic School of ORAN (ENPO-MA, Ex:ENSET), Oran, Algeria.
Abstract:
This paper presents modeling and study of 12-pulse HVDC (High Voltage Direct Current) based on real time simulation where the HVDC inverter is connected to a weak AC system. In goal to study the dynamic performance of the HVDC link, two serious kind of disturbance are applied at HVDC converters where the first one is the single phase to ground AC fault and the second one is the DC link to ground fault. The study is based on two different mode of analysis, which the first is to test the performance of the DC control and the second is focalized to study the effect of the protection function on the system behavior. This real time simulation considers the strength of the AC system to witch is connected and his relativity with the capacity of the DC link. The results obtained are validated by means of RT-lab platform using digital Real time simulator Hypersim (OP-5600), the results carried out show the effect of the DC control and the influence of the protection function to reduce the probability of commutation failures and also for helping inverter to take out from commutation failure even while the DC control fails to eliminate them.
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