WEG CFW11 Applications Manual page 19

Control Method by Maximum Power Point Tracking
4 CONTROL METHOD BY MAXIMUM POWER POINT TRACKING
The strategy of control method of variable reference is constantly tracking the maximum power point of the
system (MPPT).
The maximum power point of a solar module changes according to the solar radiance incident on the solar
cell, as well as the temperature, wind velocity, inclination of the solar photovoltaic module, passing of clouds,
thus generating the need of the constant search for maximum power of the system. Compared to the fixed-
point method, MPPT provides a higher system efficiency, which can reach 20 %.
Where:
(1) Automatic Proportional Voltage Value at Maximum System Power
(2) Minimum Control Setpoint Level per MPPT (P1022)
(3) Maximum Control Setpoint Level per MPPT (P1023)
( ➔) Increment Rate MPPT (P1019)
The maximum and minimum setpoint levels of the MPPT control must be adjusted according to the
characteristics of the photovoltaic panels and be within the protection limits of the frequency inverter. Figure
4.2 shows the behavior of the system with the default parameterization of voltage levels.
vervolta e
Level
P 23
P 22
ndervolta e
Level
Figure 4.2 – Range adjust of minimum and maximum MPPT tracking values.
Figure 4.1 – Maximum Power Point Tracking
DC Lin
olta e
Level to start Level to stop
ime
Solar Pump Drive | 19