Working Principle - KEHUA TECH SPI-B Series User Manual

SPI-B Series (30K-60K) String PV Grid-tied Inverter
User Manual
Figure2-6 DC switch
When maintenance or wiring, it should switch off DC switch.

2.3 Working Principle

PV array input connected with inverter, which will combine into n routes of MPPT circuits inside the
inverter to do the max. power point tracking. Then convert the DC power into three-phase AC power
through inverting circuit and support the surge protection in the DC side and AC side, the details refer
to Figure2-7.
+
PV1+
-
PV1-
+
PV2+
-
PV2-
+
PV3+
-
PV3-
+
PV3n-2+
-
PV3n-2-
+
PV3n-1+
-
PV3n-1-
+
PV3n+
-
PV3n-
Figure2-7 Working principle diagram
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. . .
. . .
Optional
Three level
inverting
MPPT1
+ +
BUS
- -
. . .
. . .
MPPTn
+
-
2 Overview
U
V
W
N
PE
11