Failures; Grid - SMA Sunny Island 2012 Technical Description

Connecting External Sources

13.1.10 Failures

Reverse Power
If the reverse power ("233.13 GnRvPwr" parameter) set for the "233.14 GnRvTm" time is
exceeded, the generator is disconnected and stopped. The power down time (Cool, parameter
"233.10 GnCoolTm") is skipped and the system transitions into the minimum stop time (Lock). After
reverse power, the connection is blocked for at least for the period "231.02 ExtLkTm" or
"233.09 GnStpTmMin".
Generator Failure
If a generator failure is detected (failure on the master phase), the generator is disconnected
immediately and a stop signal is activated at the generator. The system enters the the stop time
(Lock).
Generator Phase Failure
The breakdown of a phase (e.g., blown fuse) at a slave device is treated as a phase breakdown.
The slave device then disconnects this phase. If the phase is detected as being available again, it is
reconnected after the warm up time "233.12 GnWarmTm" has elapsed.
The phase failure on the master device is treated as a generator failure (see above).
Slave Device Failure
If a slave device fails, the system continues to operate using both the remaining devices of the cluster
as well as those on the generator.

13.2 Grid

The Sunny Island supports the operation of grid backup systems on the grid. Here, a distinction is
made between two main states: either a main power grid and stand-alone grid are connected or a
main power grid and stand-alone grid are disconnected. The operating mode of the Sunny Island
is derived from this. If the stand-alone grid is disconnected, the inverter alone is responsible for
powering this stand-alone grid. If the main power grid is connected to the stand-alone grid, the
stand-alone grid is powered from the main power grid. The voltage and frequency in the stand-
alone grid and in the main power grid are identical.
Information
Under specific conditions, the system can also temporarily feed energy from the stand-
alone grid into the main power grid in the GridCharge operating mode
("232.08 GdMod" parameter).
146 SI2012_2224-TEN082311
SMA Solar Technology AG
Technical Description