Grid Interconnection of Hybrid Energy Sources at the Distribution Level With Power-Quality Improvement
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.
Power quality, Active power
filter (APF), Dynamic Voltage Restorer (DVR), distributed generation (DG),
distribution system, grid interconnection, power quality (PQ), renewable
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