Siemens SINAMICS DCP Operating Instructions Manual page 400

Operation
7.21 Technological functions
7.21 Technological functions
7.21.1 MPP Tracker
See function diagram 6700 in the SINAMICS DCP List Manual.
General information
An MPP tracker is required to optimally operate a PV array with the SINAMICS DCP.
An MPP tracker (maximum power point tracker) ensures that the highest possible power is
drawn from a solar panel or a PV array. This operating point is designated MPP (maximum
power point).
The MPP tracker controls the operating conditions of the PV array so that it is always
operating at the MPP.
For this type of application, generally the SINAMICS DCP is connected at one side with the
PV array, and at the other side with a DC link. Energy is drawn from the DC link using an
inverter and fed into the line supply/grid.
Principle of operation
The following example shows possible hardware topology when using a SINAMICS DCP to
feed the energy of a PV array into the line supply/grid. The descriptions refer to this example.
In principle, the PV array can be connected to each side of the DCP.
Figure 7-95
The voltage of the PV array depends on the temperature, solar radiation intensity and the
current drawn, while the voltage of the DC link is specified by the inverter.
The SINAMICS DCP is capable of generating a defined current flow between these two
voltage levels, irrespective of the actual voltage values and on which side the voltage is
higher or lower.
The characteristic of a PV array (voltage with respect to current, power with respect to
current) in principle looks like this:
398
Hardware topology
Operating Instructions, 09/2019, A5E34382853K
SINAMICS DCP