SMA SC 500CP-US-10 600V - Manual (Page 37)

SMA America, LLC 3 Product Description
Operating Manual SCCP-US-BE-US_en-52 37
3.7 Grid Management Services
3.7.1 Requirements
PV plants must participate in feed-in management in accordance with IEEE 1547. First and foremost, the 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 grid operator's relevant control commands must therefore be transmitted to the inverter quickly and reliably for
implementation.
The following figure shows how the specifications of the grid operator are implemented. The Power Reducer Box sends
the specifications of the grid operators to the inverter.
Figure 14: Principle of grid integration
Besides the Power Reducer Box, there are two other options for meeting the requirement of grid management:
• Receiving the signals via two analog inputs on the inverter
• Manually adjusting the specifications via parameters
3.7.2 Active Power Limitation
There are five methods of limiting active power independently of power frequency. The limit can be configured by means
of a parameter or supplied by the grid operator as an external signal(see Section 7.2, page 53).
In addition to these methods, the active power can also be limited as a function of the power frequency (see Section 7.1,
page 52).
3.7.3 Reactive Power Setpoint
The inverter can provide reactive power. There are eleven methods for selecting the setpoint. They include entering a fixed
parameter, processing an external signal from the grid operator or specifying the reactive power using adjustable
characteristic curve parameters (see Section 8, page 56).
3.7.4 Full and Limited Dynamic Grid Support (FRT)
With full dynamic grid support, the inverter supports the utility grid during a brief grid voltage drop by feeding in reactive
current. In this case, the behavior of the inverter depends on the percentage ratio of line voltage V
Grid
to nominal voltage
V.