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what is the difference between Incremental conductance mppt algorithm and Perturbation and observation (P&O) mppt algorithm ? which is better ..

 in my project i am using p&o algorithm, but i found when it reach maximum voltage then it again come back and start from zero frequency, this variation is continue, it is not stable, so i want  to use such a algorithm to stable it after reaching max point..

please suggest me how to do it..   which algorithm i have to use..