Inverter 4 mpp tracker how works

Photovoltaik.org

The maximum power point (MPP) of a solar module or a string is the point on the current-voltage characteristic curve at which the solar module provides the highest output. The MPP tracker now has the task of determining the maximum power point, as this depends on solar radiation, temperature and individual module properties and is therefore constantly changing.

Integration in the inverter

In grid-connected photovoltaic systems, MPP tracking is a component and task of the inverter; in stand-alone systems, the charge controller takes over the task of the MPP tracker. The MPP tracker in the inverter constantly ensures that the performance of the modules combined into strings is always optimally matched to the respective radiation and temperature status.

functionality

The MPP tracker always creates the optimal load resistance in order to make the product of current and voltage as large as possible. This is implemented with a DC voltage converter. For MPP tracking, the DC voltage converters are switched as step-up converters, step-down converters or inverters, with MPP trackers usually being implemented as step-up converters.

Control of the MPP tracker

The functions of the MPP tracker are taken over by a microcontroller in modern inverters and charge controllers. Now the inverter has the task of always keeping the power that is fed into the grid as high as possible. Ultimately, MPP tracking is an adaptive controller that adapts the power based on a setpoint for the input voltage. If the voltage value is changed and it is shown that a higher output is achieved, the setpoint is readjusted accordingly. Each inverter manufacturer has its own algorithm and software, according to which MPP tracking is carried out.

Performance optimization

The performance of the photovoltaic system can be optimized through MPP tracking. There are now also inverters for solar systems that are partially shaded. Here the MPP trackers are optimized for shading situations.