Direct sizing and characterization of Energy Storage Systems in the Energy-Power plane

This paper presents an original sizing method for Energy Storage Systems (ESS) based on directly matching their capabilities– as specified by their energy-power Safe Operation Area (SOA) in the Energy-Power (EP) plane – with the energy and powerdemand required to accomplish their missions. Starting from the system requirements and from an energy management strategy,the power demanded by a set of representative operating scenarios and its associated energy are calculated and represented astrajectories in the EP plane. The objective is to size the ESS such as its SOA contains these trajectories. Comparison betweendifferent technologies of Energy Storage Devices (ESDs) is possible using this SOA characterization. Special attention should bepaid to compare specific SOAs across devices. Diverse energy management strategies can be synthesized in the EP plane where theycan be compared and analyzed. The sizing method converges extremely fast and is suitable for its integration in an optimizationloop. The method allows to determine directly and efficiently the technology and the size most appropriate (in terms of indicatorssuch as mass or cost) to a given EP demand. In the paper, three different technologies (SuperCapacitor, Li-Ion and H2/O2 batteries)are characterized and compared in terms of sizing synthesis

Hybrid wind-photovoltaic power systems: Structure Complexity and Energy Efficiency, Control and Energy management

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Hybrid solar-wind system with battery storage operating in grid-connected and standalone mode: Control and energy management - Experimental investigation

International audienceThe paper presents experimental results from the operation of a test bench constituted of a Grid-connected Hybrid system. This device includes wind and photovoltaic (PV) physical emulators, battery energy storage, load and a controlled interconnection to the Low Voltage (LV) grid. Both the Wind generation unit and the PV generation unit are connected to the weak AC grid via a single phase inverter with a lead acid accumulator. The grid power inverter is suitably controlled to permit the operation of the system either interconnected to the LV grid, or in standalone mode, with a seamless transfer from the one mode to the other. The paper provides a technical description of the Hybrid system devices and of the inverter energy management, along with extensive measurement results which demonstrate the system capability to operate in the aforementioned mode

Design and Energy modelling of stand-alone hybrid Photovoltaic- Wind generating system with integration of converters losses

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Design and Control method of a small -scale reverse osmosis desalination unit powered by PV-Wind hybrid system without batteries storage

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Energy Management of Reverse Osmosis Desalination Process Powered by a Hybrid Renewable Energy Source

International audienceThis work takes place within complex and typical problem through which the authors seek to resolve suitability between both water and energy issues. In this contribution, a new energy management strategy of a Brackish Water Reverse Osmosis (BWRO) desalination plant is developed. This unit is powered by a hybrid source: photovoltaic-wind. The main objective of the developed strategy is to maximize fresh water production taking advantage of the available renewable energy. This strategy ensures the DC link stability and the power flows between the hybrid source and the motor-pumps of the BWRO desalination process. The proposed method gives correct results confirmed by simulation results and experimental tests

Systemic design and energy management of a standalone battery-less PV/Wind driven brackish water reverse osmosis desalination system

International audienceThis work investigates a small-scale reverse osmosis desalination system dedicated for off-grid communities lacking freshwater. This system, constituted of motor-pumps, desalination process and hydraulic network (pipes and valves), is powered by hybrid photovoltaic-wind turbine source. It exploits hydraulic storage in water tanks filled when renewable energy is available instead of electrochemical storage. Such specificity makes the power/freshwater supply a challenging issue for these communities. To maximize freshwater production of this autonomous system, a "systemic design approach" integrating couplings between architecture, sizing, and energy management is proposed. According to the specific system architecture and its component sizing, a specific quasi-static model-based energy management strategy (EMS) is developed. In this regard, the influence of the main component sizing on the system energy efficiency and the EMS performance is analyzed. This study proved the strongly coupling between power/water management and pump sizing. According to the iterative process of the systemic design approach, simulation results showed that the EMS objective is reached by increasing the brackish water storage tank capacity and improving the system energy efficiency. The latter is achieved by choosing the pumps-combination composed of three pumps having the lowest rated powers (0.37kW/0.37kW/1.5kW), but offering higher energy efficiency over other analyzed pumps-combinations