Specific Doubts in MPPT for PMSG Stand-alone Applications

Hello everyone, I am working on MPPT Schematic for a PMSG stand-alone wind energy conversion system. I have seen from my literature review that grid-connected WECS are better analyzed than stand-alone systems. Hence, I would like help in clarifying some of my doubts.

Find attached (my impressions of) a schematic of a Stand-Alone WECS.

http://bit.ly/w8w41M

1. Is the Schematic A correct, or is Schematic B correct. If I want to analyse the behaviour of existing stand-alone systems to study their performance, which schematic should I base my simulation upon? (ie. Is a battery necessary in my simulation studies)

2. I have read that regulation of the Dc-Link voltage leads to change in the generator loading, thereby leading to achievement of MPPT. Are they referring to Vdc, in or Vdc, out here (when they say Dc-link voltage)? My guess is Vdc, in (which is why the Boost converter is needed), but I would like to be sure.

3. What is the purpose of the Boost converter? Is it needed to perform MPPT by changing the loading on the Generator (by changing duty cycle) or to maintain the DC-link voltage at a constant value by controlling duty cycle. Is the Dc-Link Voltage (Vdc, in or Vdc, out) kept at a constant value?