3 Product Description
SMA Solar Technology AG
28
SCCP-JP-BA-A4-en-12
User Manual
Type of insulation monitoring device used
The insulation monitoring device used is the A-ISOMETER iso-PV1685 device supplied by Bender GmbH & Co. KG.
3.8 Grid Management Services
3.8.1 Requirements
Due to the growing number of PV systems feeding into the utility grid, these PV systems increasingly have to take on feed-in
management functions. In Germany, for example, they are obliged to offer grid management services. First and foremost,
the grid operator must be able to limit the power of the PV system by remote control and temporarily reduce it to zero in
critical cases. The grid operator's corresponding control commands must therefore be transmitted to the Sunny Central
inverters quickly and reliably for implementation.
The following figure shows how the specifications of the grid operator are implemented. The Power Reducer Box or
Power Plant Controller sends the specifications issued by the grid operator to the Sunny Central.
Figure 10: Principle of grid integration
As an alternative to the Power Reducer Box or Power Plant Controller, there are two other ways of enabling grid
management services:
• Reception of the signals via two analog inputs on the Sunny Central
• Manual configuration of the specifications via parameters on the Sunny Central
3.8.2 Active Power Limitation
Active power can be limited independently of power frequency by five different methods. The limit can be configured via
a parameter or supplied by the grid operator as an external signal (see Section 8.1.2 "Frequency-Independent Active
Power Limitation", page 50).
In addition to these methods, active power can also be limited as a function of power frequency.
