A multi-objective control strategy for the integration of RDG
system to the distribution grid to eliminate the harmonic distortion,
to ensure the reactive power compensation and to provide
active power in addition to the grid frequency regulation has been
proposed in this paper. This control has two main structures. The
first one is the “NL Loads currents identification system” which is
used to calculate the reference currents applied for each renewable
source inverter control to ensure harmonic and reactive power
damping. The second one is the “active power transfer and frequency
control algorithm” which is implemented to control the
fundamental active power exchange between the RDG and the
electrical power system and to provide the grid frequency service.
The proposed method in different operation modes of the studied
RDG has been tested through simulation results. The obtained results
prove that the electrical network does not need to generate
harmonic and reactive currents for NL loads. Similarly, the utility
frequency variation is well minimized into desired range of stability.
This shows that the studied RDG can be considered simultaneously
as active power filters, reactive power corrector devices,
active power generator and frequency regulator.