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Figure 2-12 Circuit diagram for the SUN2000-28KTL
Each component of the SUN2000 works as follows:
The input current check circuit determines the operating status of each PV string and
generates an alarm prompting for repair if a PV string is not working properly.
The DC switch can be used to disconnect internal circuits from the DC input of the
SUN2000 to facilitate manual operations during maintenance.
The class II DC surge protective device (SPD) provides a discharge loop for DC
overvoltage to protect SUN2000 internal circuits against the impact of power surges.
The input and output electromagnetic interference (EMI) filters remove EMI from the
SUN2000 to meet electromagnetic compatibility requirements.
The MPPT circuits measure the voltage and current of the PV strings in real time and
track the maximum power point to ensure maximum output power of the system.
The DC-AC converter circuit converts DC power into AC power which is then fed to the
power grid with equivalent output frequency and voltage.
The LCL filter removes high-frequency components from the output current of the
SUN2000 to ensure that the output current meets power grid requirements.
The output isolation relay isolates the AC output of the SUN2000 from the power grid if
either of them is faulty.
The class II AC SPD provides a discharge loop for AC overvoltage to protect the
SUN2000 internal circuits against the impact of power surges.
Working Modes
Figure 2-13 shows the changes in conditions that cause the SUN2000 to switch between
working modes.
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