Abstract
In remote locations, it is advisable to combine solar water pumping with electric energy storage and power supply for other forms of consumption. In such complex systems, individual subsystems feature their own local control, and the general automatic control of the system in different modes of its operation is carried out in accordance with an energy management strategy (EMS). In this paper, the functions of local and general control of the solar water pumping system with battery storage and external power supply are combined in the system of passivity-based control (PBC). The EMS is constructed in such a way that for all modes, only two PBC systems are developed, which are switched depending on the battery’s state of charge and the current levels of the two main disturbances—solar irradiation and electrical consumption. For each system, two control influence former (CIF) structures were synthesized and their operation was investigated by computer simulation. Despite the simplicity of CIFs’ implementation, due to the introduced interconnection and damping coefficients, such control allows the provision of the required voltage regulation with a static error up to 1%, sufficient quality of transients during disturbances and switching of the system structure, as well as system asymptotic stability.
Highlights
Water pumping is one of the most widespread technological processes, and they are mostly used for supplying water to houses, private residents, farms, agricultural irrigation, etc
In order to study the work regularities of the investigated structure of solar water pumping systems (SWPS) and to evaluate the efficiency of the obtained control laws in Equations (39), (41), (43) and (45), we conducted a computer simulation of the synthesized passivity-based control (PBC) systems at solar irradiation and electrical load changing in MATLAB/Simulink
The control functions are input into the block MATLAB Function, where the program of Incremental Conductance (IC) maximum power point tracking (MPPT) algorithm is written, and the energy management strategy (EMS) Subsystem, where the algorithm of EMS is realized
Summary
Water pumping is one of the most widespread technological processes, and they are mostly used for supplying water to houses, private residents, farms, agricultural irrigation, etc. In modern conditions characterized by a lack of fossil fuels and increased attention to environmental protection, solar water pumping systems (SWPS) have become one of the most common applications of solar photovoltaic, especially in developing countries, for domestic applications in remote locations [1,2] This is due to its ability to fulfil a wide range of technological needs, the simplicity of its technical implementation, its high reliability and its cost effectiveness. Due to the significant reduction in the cost of solar panels, the focus of the design of SWPSs has shifted to ensuring high efficiency and reliability For this purpose, maximum power point tracking (MPPT) of PVAs is usually used, which operates according to different algorithms, most often Perturb & Observe (P&O) and Incremental Conductance (IC) [3]
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