Abstract:

Renewable Energy Source (RES) integrated at distribution level is known as Distributed Generation (DG). This paper presents a control strategy for achieving maximum benefits from these grid-interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF and L,C Filter to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. Dynamic Voltage Restorer to compensating the Voltage sags and swells. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid.

KEYWORDS

Power quality, Active power filter (APF), Dynamic Voltage Restorer (DVR), distributed generation (DG), distribution system, grid interconnection, power quality (PQ), renewable energy. 

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