Iran Energy News Oil, Gas, Petrochemical and Energy Field Specialized Channel
Related Articles
In this paper. the design aspects of low-voltage DG-PV units were investigated in order to comply with LVRTC requirements. The theoretical analysis revealed how the impedance of the DG units affects the bus voltages of the distribution network after a fault occurrence. Moreover. the concept of voltage selectivity is defined. Certainly. the DG-PV over-sizing has to be limited (up to 75 or 100%) so as to avoid an exaggerated power converter size and cost. In this direction. an optimum design for DG-PV units was proposed. concerning the maintenance of bus voltages of the low-voltage distribution network at the highest possible levels in case of a disturbance. achieving so voltage selectivity according to the LVRTC scheme. This optimisation process revealed that when the ODlimit relaxes (10–۱۰۰%). then voltage selectivity may be attained under various PL values (considerably higher than the current ones). with minimum impact on the network protection settings. Therefore the present paper sets the necessary design challenges for the power electronics’ designers. in terms of effective development of DG-PV converters suitable for increased PL values
