Abstract:
This research paper presents a new approach for
achieving maximum utilities from the grid-interfacing
inverters using the modified PI controller viz., AWPI and
SMC controller. When installed 3-phase 4-wire distribution
systems to achieve the voltage profile of system. Usually, the
photovoltaic energy sources generate power at variable low
dc voltage, Thus, the power generated from these renewable
sources are interconnect using various converters before
connecting on dc-link. In this proposed work, a maximum
power point tracking (MPPT) scheme has been used to
obtain maximum power from the renewable energy system
and DC/DC converter is implemented to maintain a
constant DC voltage. The universal inverter is controlled to
perform as a multi-function device by incorporating active
power filter functionality. System transients are suppressed
and normal conditions are quickly restored with shunt APF
and Ultracapacitor instead of DC link capacitor. So, it can
be concluded that Ultracapacitor based energy storage
technology can be used to enhance the operating capability
of APF to maintain high quality grid voltage.
Ultracapacitor is very fast in charging and discharging
compared to traditional DC link capacitors which is needed
to restore the system. Finally, the performance of the system
can be analyzed and implemented by incorporating Sliding
Mode Controller (SMC) and Anti-windup PI (AWPI)
controller with modified ultra-capacitor filter circuit in the
PI Controller. This new control concept is demonstrated
with extensive MATLAB / Simulink.
