3 MPPT Method with Generic DC/DC Converter

Some MPPT method regulates the operation voltage of PV panel at MPP accurately, but usual needs a very complex control circuit or algorithm. Considering sometimes the output power of PV panel around MPP is not much worse than the power at MPP, so it is not necessary to take much effort to regulated at MPP accurately. There is a rough but very simple MPPT method called hysteresis control, it means to startup and shutdown the PV system to make sure that the PV panel operates around MPP.

Define V_{PV_UVLO_rise} and V_{PV_UVLO_fall} separately as the startup voltage and shutdown voltage. And the PV system is turned on when the voltage of PV panel is rising to V_{PV_UVLO_rise} (the sunlight becomes stronger), and turned off when the voltage is falling below V_{PV_UVLO_fall} (the sunlight becomes weaker).

Based on this, the engineer needs to program the startup and shutdown voltage of the DC/DC power converter for different types of PV panels.

Figure 3-1 shows a diagram of hysteresis control MPPT method.

Figure 3-1 Hysteresis Control MPPT Method