Variable Speed Photovoltaic Water Pumping Using Affinity Laws

Abstract

Photovoltaic (PV) power is most commonly used for water pumping applications. The DC output voltage of PV arrays is connected to a DC-DC converter using a maximum power point tracking (MPPT) controller to maximize their produced energy. Then, that converter is linked to a voltage source inverter (VSI) that converts DC power to AC power. Vector control is used to control the VSI fed three phase induction motor driving the water pump. The Affinity laws are used to change the pump characteristics by changing the pump speed, and consequently, the pump flow rate, head, and power will be varied. In this paper, the Affinity laws are adapted to achieve the pump hydraulic requirements while the power delivered to the pump motor remains unchanged by constructing new pump curves. A Matlab/Simulink model of the PV pumping system is observed over a wide range of weather and loading conditions.

Battery energy storage for variable speed photovoltaic water pumping system

“…The battery storage system for the PV water pumping system is shown in Figure- The PV data, Boost DC-DC converter calculation and values, MPPT topology, VSI control technique and the motor-pump set (three phase induction motor driving a centrifugal pump) parameters are all fully demonstrated in [3]. Additionally, a thorough explanation of the inclusion and function of the LC filter which is connected between the VSI and the loads to mitigate the noise and harmonics as well as the active damping technique and the adaptive hysteresis band current control method are given in [9].…”

“…It is estimated that the PV electricity will contribute with 7% of the world electricity needs by the year 2030, and this will increase to reach 25% by the year 2050 [1]. The most common PV application is solar water pumping [2,3]. The energy extracted from the PV modules depend on weather conditions.…”

“…The method proposed by [3] is a new one where the water pump is able to accommodate for the desired hydraulic requirements (pumping flow rate and head) when the pump motor is fed only from the PV array without any connection to other power sources or energy storage systems. Although this method is fairly effective, it has some limitations, namely it can't achieve high values of both flow rate and pumping head at the same time due to the fixed power source, and it doesn't take full advantage of the Affinity laws capability which relates to energy conservation and efficiency.…”

Optimal operation of renewable energy irrigation system using particle swarm optimization

“… Motor-Pump set which is a three phase induction motor driving a centrifugal pump of type (LKH-/ LKHP-/ LKHI-60, 50 Hz) manufactured by Alfa Laval (Alfa Laval Corporate AB). The motor parameters (Moubarak et al, 2017) are given in Table-3.…”

“…Solar power generation is continuously increasing in many power systems around the world in an effort to increase renewable energy penetration as it offers an excellent solution for providing sustainable and clean energy. The most common PV application is solar water pumping (Chandel et al, 2015;Moubarak et al, 2017). The dc output voltage of PV arrays is connected to a dc/dc converter using a maximum power point tracking (MPPT) controller to maximize their produced energy (De Brito et al, 2013;Forouzesh et al, 2017).…”