Generally, have open-loop MPPT method and closed-loop method. Now let’s lean some knowledge about open-loop MPPT method.
The traditional MPPT method according to the judgment method and the different of criterion are divided into open-loop and closed-loop. actually, the influence from environment temperature, illumination and the change of load status for PV battery output show some basic rule.
For example, the max power point voltage of PV battery between PV battery open circuit voltage exit some linear relation. Base on this rule. Can provide some open-loop MPPT control method. Such as constant voltage tracking method. Shot circuit current current coefficient method and interpolation calculation method and so on.
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