Page 389 - Advances in Renewable Energies and Power Technologies

362 CHAPTER 11 Energy Management for PV Installations

P pv, P load, P FC

Calculate P= P pv -P load

No Yes
P 0
P=0
No Yes

Mode1 Mode4
P pv=0
No Yes

Yes
No P FC=0 P FC=0
No
Yes
Yes
Mode 2 Mode 6 Mode 3 Mode 5

FIGURE 11.8
Energy management strategy of PV/FC system based on four switches.

Table 11.9 Different Cases of the Available Power in PV/FC System
DP Load Electrolyzer
Case 1 > Supplied by PV P elec ¼ DP
Case 2 < Supplied by fuel cells 0
Case 3 ¼ 0 Supplied by PV 0

The different powers can be expressed in terms of the different switches as:

(11.19)
P pv ¼ K 1 $K 2 $K 3 $K 4 þ K 1 $K 2 K 3 $K 4 þ K 1 $K 2 $K 3 $K 4 $P pv

P FC ¼ K 1 $K 2 $K 3 $K 4 þ K 1 $K 2 K 3 $K 4 $P FC (11.20)

P elec ¼ K 1 $K 2 $K 3 $K 4 $P pv (11.21)