Abstract
In recent years, one of the suitable solar photovoltaic (PV) applications is a water pumping system. The simplest solar PV pumping system consists of PV array, DC-DC converter, DC motor, and water pump. In this paper, water pumping system sizing for Libya is evaluated based on a daily demand using HOMER software, and dynamic modeling of a solar PV water pumping system using a Permanent Magnet DC (PMDC) motor is presented in Matlab/Simulink environment. The system performance with maximum power point tracking (MPPT) based on Fractional Open Circuit Voltage (FOCV) is evaluated with and without a battery storage system. In some applications, a rated voltage is needed to connect a PMDC motor to a PV array through a DC-DC converter and in other applications the input voltage can vary. The evaluation of the system is based on the performance during a change in solar irradiation. Using Matlab/Simulink, simulation results are assessed to see the efficiency of the system when it is operating at a specific speed or at the MPPT. The results show that an improvement in the system efficiency can be achieved when the PMDC motor is running at a specific speed rather than at the peak PV power point.
Highlights
In rural areas, standalone photovoltaic water pumping systems have become very competitive solution for water supply because the access to an electric grid is not available or costly effective
Since the PV array is directly coupled to the Permanent Magnet DC (PMDC) motor through a FOC based maximum power point tracking (MPPT), the power causes an increase in the mechanical output torque
This makes the performance of a PMDC less efficient since the efficiency of PMDC motor is a function of rotor speed
Summary
Standalone photovoltaic water pumping systems have become very competitive solution for water supply because the access to an electric grid is not available or costly effective. In [2] a simulated model of directly connected solar PV system to a PMDC motor water pumping system and its experimental results are carried out and analyzed. A simulation and experimental results are carried out Journal of Renewable Energy to evaluate the performance of the PMDC motor compared to the single phase induction motor. The results show that the maximum efficiency of the induction motor and overall standalone solar system is achieved under a variation of the solar irradiation. The best performance for standalone water pumping systems without MPPT can be achieved with matching electromechanical characteristics of a motor and a solar PV array. The experimental and simulation results are carried out based on a good match between the electromechanical characteristics of the PMDC motor and the solar PV array at various solar irradiation values. The comparison is based on the PMDC motor efficiency for a different scenario of rotor speed
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