problem with a PYO MMPT mode and PV modulel Matlab 2016

I want to implement a P & O MPPT control, using the solar module in matlab 2016, the problem I have is when I do the boost converter does not raise me to what I want, unless I put the powergui in continuous mode, otherwise it does not raise To what I want, the other problem is that when I implement the mppt does not do any work, the voltage of the panel becomes zero and I do not understand why or to that it should not work, and check the examples that come, but it does not give me all ways.