Due to the variable characteristics of photovoltaic energy production or the variation of the load, batteries used in storage systems renewable power can have many irregular cycles of charge 1 discharge. In turn, this can also have a disadvantageous 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 captivating peaks currents as order 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 combine with batteries and supercapacitors are controlled by current.
The components of the systems are directed 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 work of the proposed control strategy, for the overall system.
- DC bus
- Energy storage
- Energy management
- Converters control
In this paper, the storage photovoltaic energy by using a combination of Battery-Supercapacitor has been given. 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 glow and/or the variation of the load.
This controller gives the better an efficient energy management and ensures continuity of supply by using the methods 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 method of DC bus are effective and able to supply want power. It is also shown that SCs can absorb rapid changes in current to reduce the stress on batteries.
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