The prime objective of this study is to achieve a highly efficient and reduced-cost configuration of a solar photovoltaic (PV)-based water pumping system using a canonical switching cell (CSC) converter employing a switched reluctance motor (SRM). A CSC converter with a maximum power point tracking controller utilises a continuous conduction mode (CCM), which helps in power optimisation of PV array and limiting the starting inrush current in the SRM by requisite control. The CCM operation of CSC converter considerably reduces the stresses on its components. The fundamental switching of a mid-point converter lowers its losses and it improves the system efficiency. The proper selection of perturbation size and initial duty ratio of CSC converter provide the soft starting to SRM drive. An experimental prototype of the proposed configuration is developed and it authenticates its suitability over varying irradiance and different environmental conditions.
This paper deals with the simple design method and performance investigation of a solar photovoltaic (SPV) array fed water pumping system employing a switched reluctance motor (SRM) drive coupled to a centrifugal water pump. SRM possessing a number of advantages over the dc and ac motors such as high torque density, low inertia, quick response, low losses because of the absence of permanent magnet or winding on the rotor, wide speed range capability, and simple control, suits for the SPV powered water pumping system. A DC-DC Cuk converter which facilitates the continuous and smooth input/output current and boundless region for maximum power point tracking (MPPT) operation is used as an intermediate DC-DC converter between the SPV array and the mid-point converter, in order to operate the SPV array at its optimum power point. The proposed system, subjected to the dynamically changing atmospheric condition is designed; modeled and simulated using MATLAB/Simulink and the simulation results of SRM are represented to demonstrate its suitability and performance.
This paper proposed a new structure of single switch dual output Zeta derived DC-to-DC converter for an efficient harvesting of photovoltaic (PV) power for a 4-phase switched reluctance motor (SRM) driven agriculture pump. The system is essentially developed to minimise both cost and complexity, while synchronously guaranteeing optimal operation of the PV array. The proposed converter is derived from a hybrid of a 'Zeta' and Landsman converters and so it contains all the benefits of both converters including balanced outputs. Due to an identical instantaneous duty cycle, the switching node is shared by both Zeta and Landsman converters. The proposed converter offers continuous power to drive, a low ripple in output current, and balanced dual output supply. The PV power optimisation and to deliver smooth start of SRM, are the two major objectives of proposed DC-to-DC converter. A new maximum power point tracking (MPPT) technique is also used in the system to optimise the performance of PV array. Moreover, the proposed MPPT control has an additional advantage of regulating the flow rate of water pumping by adjusting the duty cycle of DC-to-DC converter. The motor speed is smoothly regulated through the variable DC link voltage of a mid-point converter.
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