Abstract
This paper presents different controlling techniques of the converter used for the solar photovoltaic water pumping system (SPVWPS) driven by permanent magnet DC (PMDC) motor. The direct-coupled PMDC motor-driven solar water pumping systems have many advantages like high efficiency, longer life cycle and less cost due to the absence of energy storage element such as batteries. This direct coupled PMDC-driven SPVWPS is easy to control when we compare with inverter circuit-fed AC motor-driven water pumping systems (WPS). In this literature review, DC-DC converter controlling techniques and maximum power point tracking (MPPT) methods adopted in direct coupled PMDC motor-driven SPVWPS have been discussed. This literature review will serve as a complete reference to identify the advantages and the scope for future work in direct-coupled PMDC motor-driven solar PV water pumping systems.