Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1483
| Posted: 01:56am 30 Mar 2020 |
I have a simulation of a solar panel working well.
It uses the buck converter running some custom code.
The code runs in constant current mode, but with a twist.
It is CC from 0 to 15V output, and then when the output volts
rise from 15 to 18V, the output current is reduced proportionally.
This gives the sort of power verses voltage curve I need to
test MPPT code.
The data is from the constant DC load I built years ago.
I dial up a current and observe the voltage...
volts amps watts/10
18.6 0.09 0.1674
18.4 0.26 0.4784
18.2 0.61 1.1102
17.7 1.01 1.7877
17.3 1.25 2.1625
16.9 1.44 2.4336
16.2 1.77 2.8674
15.5 2.02 3.131
15 2.2 3.3
10 2.2 2.2
5 2.2 1.1
which looks like this when graphed. X axis is volts, Y is amps (and watts/10)
Beaut. Now I have something to test the MPPT buck converter against.
If my MPPT code can't find that peak then something is very wrong.
wronger than a phone book full of wrong phone numbers