load power higher voltage for example 220 DC
i put boost converter to get higher voltage than PV
That is pretty much how my own system works (230v dc output) But my system is a buck boost converter, not a boost converter.
Buck boost has fewer problems for very wide range power control, because the input and output voltages can cross over.
The maximum peak power voltage is never a really sharp spike, its a wide hump or cusp, and it does not change that much over a surprisingly wide range of temperature or sky conditions. If you can hold the input voltage pretty close to the voltage shown on the solar panel rating plate, you will be getting pretty much all of the available power.
If you hook up a solar panel through a power meter to a fully adjustable load resistance, you will find that even before sunrise you will see a very few microamps and milliwatts of power, but amazingly it still peaks around the same voltage as flat out full mid day power in a clear blue sky.
Its a lot simpler than a microcontroller with perturb and observe software, but then many guys just love the software challenge, and nothing at all wrong with that approach.
Its just not really necessary.
A simple analog system will track from milliwatts to kilowatts from dawn to dusk thought the day, and track maximum power, and work perfectly well.
Many people simply refuse to believe this, but a simple power meter and adjustable load test should prove that the maximum power voltage changes by an insignificant amount over the full operating envelope.