Grid Management; Tasks Of Grid Management; Electrical Limiting Values For The Electricity Grid - SMA SUNNY ISLAND 8.0H Installation Manual

10 External Energy Sources in the Off-Grid System
10.10 Grid Management
10.10.1 Tasks of Grid Management
Grid management performs the following tasks:
• Grid management detects failures, disturbances and the return to the electricity grid.
• Grid management controls the transition from stand-alone grid operation to grid operation.
• Grid management controls the transition from grid operation to stand-alone grid operation.
• If the electricity grid is acting as an energy reserve, grid management automatically connects
the electricity grid when required.
10.10.2 Electrical Limiting Values for the Electricity Grid
When the electricity grid breaches the electrical limiting values, grid management detects failures,
disturbances or overload of the electricity grid.
Configurable limit
Maximum line current
Frequency of voltage on the
electricity grid
Value of voltage of the
electricity grid
Maximum reverse power to the
electricity grid
140 SI80H-60H-OffGrid-IA-en-11
Explanation
Grid management limits the supply of current from the electricity
grid to a configurable maximum value.
You can adjust the limiting values for the frequency and value of
the voltage to the applicable local standards and requirements.
The frequency and value of the voltage on the electricity grid
directly affect the power quality in the stand-alone grid. When the
electricity grid breaches the limiting values, the off-grid inverter
disconnects the electricity grid from the stand-alone grid and
switches to stand-alone grid operation.
In case of reverse power, the off-grid system feeds power into the
electricity grid. Reverse power may be fed into the electricity grid
during operation with AC sources in the stand-alone grid. You can
set the active power and the permitted time for reverse power.
If the limiting values are breached, grid management disconnects
the electricity grid from the stand-alone grid.
SMA Solar Technology AG
Installation Manual