User Manual
8
Operating mode
Description
Standby
1) Standby mode mainly means that the external environment does not meet
the operating conditions of the inverter. If the light is insufficient, the DC input
switch is disconnected. In this mode, the inverter continuously self-tests and
enters the operating mode once the operating conditions are met.
2) In the standby mode, if the inverter detects a shutdown command or finds a
fault after the power-on detection, it enters the shutdown mode.
Operation
In the operating mode, the inverter converts the DC power of the PV string into
AC power and feeds it into the grid. The inverter performs MPPT operation to
output the maximum power of the PV string.
If the inverter detects a fault occurrence or shutdown command, it enters the
shutdown mode.
If it is detected that the PV string input power is lower than the grid-connected
power generation condition, it enters the standby mode.
Shutdown
If the inverter detects a fault occurrence or shutdown command during standby
or operation, it enters shutdown mode.
In the shutdown mode, if the inverter detects that the fault has been cleared or
the power-on command, it enters standby mode.
2.2 System Configuration and Application
2.2.1 Application Description
Figure 2-9 shows the application diagram of the string inverter network, Figure 2-10 shows the design
scheme of the large-scale ground PV power plant, and Figure 2-11 shows the design scheme of the
distributed PV power plant.
Photovoltaic
panels
String
inverter
AC power
distribution unit
Isolation
transformer
Grid
Figure 2-9 Schematic diagram of string inverter application
Core exhanger
Optical fiber
ring network
Intelligent
data collector
String inverter
PV arrays
String inverter
PV arrays
Box-type
transformer
Box-type
transformer
Intelligent
data collector
AC combiner
box
AC combiner
box
AC combiner
box
AC combiner
box
Power grid
AC cable
DC cable
Com cable
Figure 2-10 Large-scale ground photovoltaic power plant networking design
