ABSTRACT
Due to the
variable characteristics of photovoltaic energy production or the variation of
the load, batteries used in storage systems renewable power can undergo many
irregular cycles of charge 1 discharge. In turn, this can also have a detrimental
effect on the life of the battery and can increase project costs. This paper
presents an embedded energy share method between the energy storage system (battery)
and the auxiliary energy storage system such as supercapacitors (SC). Supercapacitors
are used to improve batteries life and reduce their stresses by providing or
absorbing peaks currents as demanded by the load. The photovoltaic cells are
connected to DC bus with boost converter and controlled with MPPT algorithm, Supercapacitors and batteries are
linked to the DC bus through the buck-boost converter. The inductive load is connected
to the DC bus by a DC-AC converter. The static converters associated with
batteries and supercapacitors are controlled by current. The components of the
systems are supervised through a block of energy management. The complete model
of the system is implemented in MATLAB/Simulink environment. Simulation results
are given to show the performance of the proposed control strategy, for the
overall system.
KEYWORDS
1. Photovoltaic
2. batteries
3. supercapacitors
4. DC bus
5. Energy
storage
6. Energy
management
7. Converters
control
SOFTWARE: MATLAB/SIMULINK
CONCLUSION
In this
paper, the storage photovoltaic energy by using a combination of
Battery-Supercapacitor has been presented. First, the modeling of different
components of the system has been addressed. A comparison of different model of
SCs is given. Second, a strategy of control and regulation of the DC bus
voltage was proposed, to deal with the variation of solar irradiation and/or
the variation of the load. This controller gives the better an efficient energy
management and ensures continuity of supply by using the methodology that
involves a reversible chopper between the batteries and the DC bus and another
between the SC and the DC bus to ensure stable voltage on the DC bus of 400V.
The three operating scenarios show that the proposed control and management
strategies of DC bus are effective and able to supply desired power. It is also
shown that SCs can absorb rapid changes in current to reduce the stress on
batteries.
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