26-04-2012, 03:11 PM
3-Phase 4-Wire Shunt Active Power Filter with Renewable Energy Interface
[attachment=20892]
Introduction
The growing concern regarding global heating and
climate change has stimulated the development of
environment friendly energy generation technologies. In
the near future, because of the Kyoto protocol and other
international accords, the electrical grid will include a
very large number of small producers that use renewable
energy sources, like solar panels or wind generators,
among other technologies.
Power Stage of the Shunt Active Filter
The power stage of the Shunt Active Power Filter
consists of a standard two-level Voltage Source Inverter
with four legs, that uses IGBTs. The capacitor voltage
can be kept constant by the renewable energy sources. If
there is no energy available from these sources, the
control algorithm changes and the energy required to
maintain this voltage constant is drained from the electric
grid. The inductors (L) are used to connect the inverter to
the electric grid.
Simulation and Experimental Results
Several tests were made to verify the performance of
the Shunt Active Filter in various operating conditions.
The simulation model is accurately modelled, and
therefore the results are very similar to the ones measured
in the laboratory prototype. Some of the techniques used
to make an accurate simulation model are described in
[4]. The obtained results are grouped and presented in the
next three topics. In each topic is presented a short
description of the testing system, followed by the
obtained simulation and experimental results. All the test
cases presented were performed in a 75 V / 50 Hz electric
system.
Conclusions and Future Work
This paper suggests the use of a Shunt Active Filter as
an interface between renewable energy sources and the
electric grid. Simulation and implementation results show
the feasibility of the proposed control strategy. The Shunt
Active Filter has the capability of injecting sinusoidal
currents with low THD, and it can also compensate
problems like current harmonics, unbalance and power
factor.
[attachment=20892]
Introduction
The growing concern regarding global heating and
climate change has stimulated the development of
environment friendly energy generation technologies. In
the near future, because of the Kyoto protocol and other
international accords, the electrical grid will include a
very large number of small producers that use renewable
energy sources, like solar panels or wind generators,
among other technologies.
Power Stage of the Shunt Active Filter
The power stage of the Shunt Active Power Filter
consists of a standard two-level Voltage Source Inverter
with four legs, that uses IGBTs. The capacitor voltage
can be kept constant by the renewable energy sources. If
there is no energy available from these sources, the
control algorithm changes and the energy required to
maintain this voltage constant is drained from the electric
grid. The inductors (L) are used to connect the inverter to
the electric grid.
Simulation and Experimental Results
Several tests were made to verify the performance of
the Shunt Active Filter in various operating conditions.
The simulation model is accurately modelled, and
therefore the results are very similar to the ones measured
in the laboratory prototype. Some of the techniques used
to make an accurate simulation model are described in
[4]. The obtained results are grouped and presented in the
next three topics. In each topic is presented a short
description of the testing system, followed by the
obtained simulation and experimental results. All the test
cases presented were performed in a 75 V / 50 Hz electric
system.
Conclusions and Future Work
This paper suggests the use of a Shunt Active Filter as
an interface between renewable energy sources and the
electric grid. Simulation and implementation results show
the feasibility of the proposed control strategy. The Shunt
Active Filter has the capability of injecting sinusoidal
currents with low THD, and it can also compensate
problems like current harmonics, unbalance and power
factor.