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In this paper, a converter control strategy able to provide ancillary services implemented for the Italian MV distribution Networks has been presented. A three stage system composed by several boost converters, a VSI Active Front End and a transformer has been considered as interface between distribution grid and DERs. The proposed control strategy operates jointly to the DMS. Simulations have been...
In this paper a new active impedance topology, employing AC-Choppers is proposed for reactive power compensation in 25 KV/50Hz railways. The good behaviour of AC-AC converters in terms of losses respect to other solutions like VSI based STATCOM, make this solution really interesting in high power single phase systems like railway networks. The concept is applied to a substation in the French Railways...
In this paper a solution to current unbalance is proposed. A three-phase grid feeds a single-phase load that causes current unbalance. This is a typical situation for AC railway substations. By employing AC-Choppers it is possible to obtain a variable Steinmetz Circuit, and define a control law able to compensate a variable current unbalance. At this effect, a theoretical analysis of load unbalance...
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