IV. STATE OF ART: POWER CONDITIONING UNITS FOR
PV WATERPUMPING
Most PV pump manufacturers include powerconditioning
units (PCUs), which are used for operating thePV panels close
to their maximum power point over a range ofload conditions
and varying insolation levels, and also forpower conversion. Dc
or ac motor pump units can be used forPV water pumping[10].
In its simplest from, a solar waterpumping system comprises of
PV array, PCU and DC waterpump unit. In case of lower light
levels, high currents can be generatedthrough power
conditioning to help in starting the motorpumpunits, especially
for reciprocating positive-displacementtype pumps with
constant torque characteristics requiringconstant current
throughout the operating region. In positive-displacement type
pumps, the torque generated by thepumps depends on the