Power Electronics
From Wiki2
http://eebookforengineer.files.wordpress.com/2013/02/power-electronics-by-daniel-hart.pdf
((D/(1-D))-Vd/Vg)*1/(1+(D*Ron+RL)/((1-D)^2*R))
(1-(1-D)/D*Vd/Vg)*1/(1+(D*Ron+RL)/((1-D)^2*R))
Vpv-IL*RL -IL*Ron*D-Vd*(1-D)-Vbus*(1-D)
