Suppose a solar panel is connected to a buck converter feeding a lead acid battery, can the solar panels output voltage which appears before the buck converter, be controlled using the duty ratio in order that MPPT is achieved?
You can control the output voltage of the PV, as long as you have a capacitor in the input of the buck converter.
In general, the PV behaves as a current source, so, when the transistor in off, the PV voltage will grow up.
The only problem in your project is that you'll a voltage, at least, equal to the battery voltage in the output of the buck converter. I can't figure it out whether it'll be possible or not to control both voltages.
Yes, the voltage of the panel can be controlled by the duty cycle obtained from the MPPT. The role of MPPT is to track Maximum Power and give this at the output of the converter by the concept of impedance matching either by keeping voltage or current constant and changing other such that power is maintained constant.
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