Self‐governing single‐stage photovoltaic water pumping system with voltage balancing control for a four‐phase SRM drive

Abstract

This work deals with an efficient and reliable solution of a standalone solar water pumping system using a 4-phase SRM (Switched Reluctance Motor) drive. Only a mid-point converter is used to drive the SRM as well as to achieve the MPPT (Maximum Power Point Tracking Algorithm) operation. The elimination of DC-DC converter offers a fast dynamic response with enhanced system efficiency. An online flux optimization with single pulse mode of SRM drive is developed and implemented. The developed control scheme eliminates the need of any phase current sensor, and the motor speed is fully governed by the available PV array power. The developed control technique removes the need for any phase current sensor and the speed of the motor is regulated through available solar power. A deviation free MPPT technique is also implemented in this system to overcome the drift problem present in the conventional P&O (Perturb and observe) technique. The appropriateness of the proposed system with developed control is demonstrated through its performance assessment utilizing simulation and test results obtained through an experimental prototype.

Design Improvements in Double-stator Axial Flux Switched Reluctance Motor for Smoother Torque Profile

“…T ripple = T pk2pk T avg (7) η = output power output power + total losses (8) where T pk2pk is the difference between maximum torque and minimum torque, and T avg is the average torque. Here η in Equation ( 8) denotes the efficiency.…”

“…Low cost converter with only one controllable switch per phase can conveniently meet the unipolar excitation requirement of SRMs [5,6]. High torque to weight ratio and simple construction make it a potential candidate for various specialized applications like E-mobility, agricultural purpose, aerospace applications, flywheel energy system, and household appliances [7][8][9][10][11][12]. However, research is underway to overcome some drawbacks such as low efficiency, low torque/power density, high torque ripple, and high vibrations.…”

Finite Element Method Based Design and Analysis of a Low Torque Ripple Double-Stator Switched Reluctance Motor

“…The property of the unipolar current excitation allows the designing of low-cost converters for SRMs with only one controlling switch per phase [5,6]. SRMs have shown ability in electric vehicle applications [7], agricultural applications [8], aerospace applications [9], flywheel energy system [10], and household appliances [11,12]. However, these machines still have issues of efficiency, lower torque/power density, high torque ripple, and high vibrations.…”