5
2.2 Schematic Diagram
Note:
The inverter topology consists of boost and inversion. PV input feeds into the
public power grid via DC filtering, boosting, DC bus decoupling, inverter and AC filtering.
It adopts DSP and MCU dual-chip redundancy technology to realize fault detection
and protection of the inverter. The interior of the inverter has two groups of relays
connected between the inverter circuit output and power grid port, and
the groups of
relays have self-test function that can ensure reliable disconnecting of the
connection between the inverter circuit and the utility grid in the event of a failure.
It realizes the remote monitoring of the PV power generation system via the communication
methods of RS485, GPRS and Wi-Fi.
2.3 Appearance of Inverter
No. Description
Explanation
①
LED Display Panel
To display the inverter running state / communication
status
PV insulation
resistance
detection
LED
Bluetooth
RS485
RS485
WIFI/GPRS
MASTER MCU
SLAVE MCU
Leakage
current
deteciton
DC switch
MPPT circuit
Grid-connected
relay
L1
L2
L3
N
PE
PV1+
PV1-
PV2+
PV2-
