Abstract
In recent years, photovoltaic (PV) systems have emerged as economical solutions for irrigation systems in rural areas. However, they are characterized by low voltage output and less reliable configurations. To address this issue in this paper, a promising inverter configuration called Impedance (Z)-source inverter (ZSI) is designed and implemented to obtain high voltage output with single-stage power conversion, particularly suitable for irrigation application. An improved and efficient modulation scheme and design specifications of the network parameters are derived. Additionally, a suitable fault-tolerant strategy is developed and implemented to improve reliability and efficiency. It incorporates an additional redundant leg with an improved control strategy to facilitate the fault-tolerant operation. The proposed fault-tolerant circuit is designed to handle switch failures of the inverter modules due to the open-circuit and short-circuit faults. The relevant simulation and experimental results under normal, faulty and post-fault operation are presented. The post-fault operation characteristics are identical to the normal operation. The motor performance characteristics such as load current, torque, harmonic spectrum, and efficiency are thoroughly analysed to prove the suitability of the proposed system for irrigation applications. This study provides an efficient and economical solution for rural irrigation utilized in developing countries, for example, India.
Highlights
India is an agriculture-based developing country with its major economic contribution from the agriculture sector
In the conventional inverter-drive system, the induction-motor drive fed by a PV source operates with two stages of power conversion: The first stage involves conversion of the low DC output of the photovoltaic array to a constant DC by a high gain boost converter, and the second stage incorporates the conversion of a constant DC voltage to a variable voltage and variable frequency supply using VSIs
There is no flow of discontinuous current through the inductors and capacitors. This results in continuous conduction mode (CCM) operation with a high reactive power
Summary
India is an agriculture-based developing country with its major economic contribution from the agriculture sector. This paper [4] presented a comparative analysis of cascaded converter topologies for PV systems The outputs of these converters are fed through inverters to ac motor drives utilized in pumping applications. The proposed system should be equipped with an effective fault-tolerant scheme which should compensate for switch failures occurred in the inverter module. This arrangement eliminates the risk of reduced volume of water during long-hours operation for irrigation in rural areas. The major contributions of this paper are summarized as follows: Design and implementation of a complete efficient irrigation system using a high gain single-stage power conversion, Z-source inverter (ZSI) and a PV system.
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