MPPT of inverter

MPPT of inverter

 

Maximum Power Point Tracking, often referred to as MPPT, is an electronic system that manages the photovoltaic modules so as to allow maximum power production. MPPT is an electronic system that varies the electrical operating point of the modules so that they are capable of delivering the maximum power available.

The inverters can embed one or more of these electronic devices, and on each of them there may be one or more inputs in parallel from the photovoltaic field. The manufacturer shall provide these data and the fields within inverters archive of the program with these data are Number of MPPT trackers and Number of DC inputs.

Note that even if the number of MPPT and the number of DC inputs are defined in the database, the program allows you to modify this data in the Scheme of system in the properties of the inverter.

 

In the case in which there are more than one MPPT tracker is possible to distribute the input current on each tracker by clicking the check mark Shares current from a single input to all MPPT. This can be achieved by exploiting a characteristic of the inverter or by inserting an External device of current splitting.

 

MPPT Properties

By clicking on MPPT Properties button, you open window that allows you to edit the properties of the MPPT, adding or deleting of trackers and determine the characteristics of each.

In the MPPT page you can modify the characteristics of each MPPT tracker, the data are derived from the data sheet of inverter, where it distributes the Maximum current from PV over the trackers.

  • Max. current from PV: Maximum possible current input on the single MPPT tracker from the photovoltaic field.

  • Min. MPPT voltage: Minimum value of voltage operating range of MPPT tracker.

  • Max. MPPT voltage: Maximum value of voltage operating range of MPPT tracker.

  • Max. voltage from PV: Maximum possible voltage input on the single MPPT tracker from the photovoltaic field.

  • No. DC inputs: Number of inputs for the selected tracker.

In the Inputs page is shown a scheme of the inputs in MPPT, using the drag&drop you can change the connections between input and trackers. Normally, the program assigns these links by distributing the input lines over all MPPT.

Note that a different distribution of the inputs changes the results of the verification of compatibility between the PV array and inverter.