SMA SC 400HE - Manual (Page 27)

SMA Solar Technology AG 3 Product Description
Operating Manual SC4-63HE-BE-BEN103280 27
3.10 Grid Management
3.10.1 Requirements
In Germany, PV plants with more than 100 kWp connected power must be integrated into the
feed-in and grid management. First and foremost, the distribution grid operator must be able to limit
the power of the PV plant by remote control and temporarily reduce it to zero in critical cases. The
relevant control commands of the distribution grid operator must therefore be transmitted to the
Sunny Central quickly and reliably for implementation.
3.10.2 Low Voltage Ride Through (LVRT)
The LVRT function interrupts feeding in for a maximum of 1.2 seconds and starts monitoring if the grid
fails.
As soon as the grid voltage begins to rise again, the Sunny Central supports the grid by feeding in at
maximum level. In case of longer grid failures, grid monitoring comes into effect, and the
Sunny Central disconnects itself from the grid.
The limiting values for monitoring the grid are specified by the electric utility company and/or state
regulations.
If you wish to deactivate the LVRT option, please consult the SMA Serviceline.
3.10.3 Active Power Limitation
Five methods are available for limiting the active power regardless of power frequency. The limit can
be defined using a parameter and supplied by the distribution grid operator via an external signal.
In addition to these methods, the active power can also be limited according to the power frequency.