An intelligent technique a high performance of a power electronic interface for single-phase grid connected (SPG) PV system. The functions of the power converter of a PV system consists of Maximum Power Point Tracking (MPPT), a combination of different methods (hybrid methods) is promising, including short circuit current method with of one of the direct methods incremental inductance, DC/DC boost converter, DC/AC universal bridge, which convert the solar dc power into high quality ac power for feeding into the grid power. The proposed system components models are implemented in Matlab/Simulink environment and interfaced with SimPowerSystem toolbox. The suggested topology has several desirable features such as better utilization of the PV array, higher efficiency. Further, due to the very nature of the suggested topology, the PV array appears as a floating source to the grid.

2. Sensor
Current
Sensor
DC-DC
BOOST CONVERTER
DC-AC
INVERTER
GRID
or
STAND ALONE
AC LOAD
MPPT Algorithm
PWM
Gate
Drive
Sensor
Current
Sensor
hybrid MPPT methods
Ish
RP
Rs
V
+
I
-
NP
NS
NS
NP
NS
NP

3. Voc
s +-
-s
Fcn 2
D2
C
D1
Isc
E
E
+
+
-
i
V
1
2
Ipv
Vpv
0.001736*G- 0.0057
Fcn1
0.0105*G+13.675
Rs
NS
NP
RP
NS
NP
Illumination
(G)
0
0,4
0,8
1,2
1,6
2
0 50 100 150 200 250
, V
, 1000 W/ 2
, 800 W/ 2
, 600 W/ 2
, 400 W/ 2
0
50
100
150
200
250
300
350
0 50 100 150 200 250
, V
, 1000 W/ 2
, 800 W/ 2
, 600 W/ 2
, 400 W/ 2

4. Decrease Duty
Cycle
Increase Duty
Cycle
Update
Reference ?
PV short circuit
condition
Measurement
of Isc
PV work
condition
Imp=KI×Isc
Measurement of Imp
Imp=Iref
Imp>Iref
No
Yes
No
Yes No
Yes
E
S
L
D
VO
+
-
+
-
MPPT
Control
C
VL VPV=
iL
VPV

5. L
VO
+
-
+
-
iL
VPV
VL VPV=
C
L
VO
+
-
+
-
iL
VPV
VL VPV= -VO
C
50
100
150
200
250
0
0
0.1 0.2 0.0.60.50.0.3
Illumination –1000 W/ 2m
VVgrid-210
Vgrid-220
Vgrid-230
V
V
Duty Cycle
50
100
150
200
250
0
0
0.1 0.2 0.0.60.50.0.3
Vgrid-210 V
Duty Cycle
Illumination, W/ 2m
1000
900
800
600

6. 0
50
100
150
200
250
300
0
Duty Cycle
Illumination – 1000 W/
2
Voltage Grid – 210V
m
0.1 0.70.60.50.40.30.2
Ppv
Pout
0
0.2
0.4
0.6
0.8
1
1.2
0
Duty Cycle
Illumination – 1000 W/
2
Voltage Grid– 210V
m
0.1 0.70.60.50.40.30.2
Voltage Grid – 210 V
Voltage Grid – 230 V
Voltage Grid – 220 V
210
220
230
600
800
900
1000
0
0,05
0,1
0,15
0,2
210
220
230
600
800
900
1000
0
25
50
100
125
150
200
225