Power Electronics Freesun String Supervisor FSITG0012AI, Руководство по началу работы

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FREESUN SERIES
– String Supervisor
POWER ELECTRONICS
10
STRING SUPERVISOR DESCRIPTION
2. STRING SUPERVISOR DESCRIPTION
The DC current generated by the panels, is transformed into AC current and synchronized in voltage and
phase by the solar inverter, and injected into the electric distribution grid, getting by this economical profit
selling the energy to the Company.
Figure 2.1: Panel connection diagram
The state of the installation is crucial for its optimization. If a solar panel is damaged, dirty or disconnected,
it will affect to all the string (they are connected in series), significantly decreasing the energy generated.
Each String Supervisor has a protection that prevents the installation from overvoltages. The String
Supervisor detects the state of the overvoltage protection. Like this, if the protection becomes out of order
due to a limitation provoked by a very high overvoltage, it will inform the inverter of the situation so that
maintenance personnel can proceed to its replacement.
The String Supervisor has a fuse in each of the panel strings that disconnects the corresponding panel in
case of an overload. If the fuse melts down, it would be detected by the string supervisor, as the current of
the string would be zero.
The String Supervisor has an unload switch, that allows the total insulation of the positive and negative
string, in order to enable maintenance without stopping the energy production.
The following diagram shows the main components of the String Supervisor:
Figure 2.2: Component diagram of the String Supervisor