Fw: New Topic MPPT and wind power [RE-wrenches]

[Allan Sindelar, Positive Energy, Inc.]

I sent Carl's query to Rick Cullen of RV Power Products. Following is the
query and his response.
Allan @+E

> > > Hullo there...
> > >
> > > We have a lot of comment on MPPT with solar.
> > >
> > > Anyone with experience in using MPPT with wind ??
> > >
> > > For example the solar boost range how might it go with an AWP36.
> > >
> > > Some MTTP momentarily disconnects the load during computation time,
this
> > might
> > > allow the mill to free spin with no load. Anyone know if the SB3048
does
> > this.
> > >
> > > I expect any MPPT unit will effectively load the mill differently and
> > hopefully
> > > maximize the best torque point a little better.
> > >
> > > How about this for a torquing point ???
> > >
> > > Carl Emerson

> Hi Allan  --  thanks for the opportunity to respond,
>
> This is an area I have interest in, and want to pursue and understanding
> better. The Solar Boost(tm) 50 and 3048 operators manuals which can be
> downloaded from out site cover in detail how these products can be used
with
> input power other than PV. The basic requirements are as follows.
>
> 1 - The input must be able to operate open circuit since control is
"series
> pass".
> 2 - The input must not exceed the max input voltage rating of the
controller
> (57V for SB50L, 140V for SB3048L) even on a transient basis.
> 3 - The input must be relatively well filtered as the Solar Boost input
> capacitors are sized to handle what is termed "ripple current" associated
> with the Solar Boost's internal power converter requirements, but not
sized
> to filter high ripple inputs at high power.
> 4 - If the input power source cannot deliver all the input current
necessary
> to support charging requirements, the Solar Boost will select an input
> operating point based on it's MPPT algorithm.
>
> So, the first thing is that the wind generator must be able to operate
open
> circuit or it cannot be used with a Solar Boost charge controller. If it
> can, then the MPPT algorithm could work quite well in operating the wind
> generator. There several elements to the algorithm, but the primary input
> operating point determination is based on loading the input source so it
> operates at some voltage less (which is user settable) than its open
circuit
> voltage. This prevents over loading the input source and has the potential
> of extracting more power as it does with PV.
>
> Whether more power can actually be extracted can't be definitively
> determined here because it depends heavily on the particular electrical
> characteristics of a particular wind generator. But, as indicated above I
> have an interest in pursuing this and would be pleased to work with
others,
> users/installers or wind generator manufacturers, to determine the
> feasibility of this approach. I would be willing to provide some
equipment,
> and if geographically appropriate my travel and time to assist with test
and
> analysis. This is the kind of thing where you need to make an initial
> assessment of whether it may work and try it...
>
> Rick Cullen
> RV Power Products

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