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The nominal input voltage is 36 V DC. Therefore, one solar panel with an output voltage of 36 V, or two solar panels each of 18 V connected in series can be used as the power source for the inverter. For demonstration purposes, the nominal output power of the solar panels can vary from about 50 W up to 200 W per panel.
The main task for this solar panel inverter demo is to present the MPPT feature. For this reason the DC-bus voltage low limit is moved to a low level, about 25 V AC. It is possible to show the output power variation from the solar panel through its dependence on rapidly changing illumination conditions.
Inverter block schematic The state of the status switch (On/Off switch as user interface) and the input voltage level from the solar panel is scanned periodically. When the inverter is switched on and there is enough voltage on input (more than 18 V), the control board starts to generate the PWM on the primary side of the DC to DC converter.
The DC output power sourced from the solar panel is periodicaly computed. The P&O algorithm for the MPPTT is applied, (see Figure 2-3). This method is based on the simple and effective P&O algorithm. In the one power point P1, you can try to sink higher power from the solar panel by inceasing the current from the panel.
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