5 Settings of Grid Management Services
SMA Solar Technology AG
Technical Information
STP60-SHP75-10-Parameter-TI-en-12
14
5.1.2
Night Mode
The system with an inverter provides reactive power also in night mode. Therefore, the inverters are not switched off
after sunset. Information: If no primary energy source is available, only the control modes 1 to 5 can be used for
reactive power provision.
In the inverter, no switch-on circuit is installed. Thus, the inverter cannot start-up / reconnect to the grid after a voltage
dip when no DC-voltage is present. The voltage of the DC busbar is directly connected to the PV arrays at night. Thus,
current can flow in the arrays. This can only be prevented via one of the following measures: using string diodes in the
DC String-Combiner or using a controllable switch in the DC String-Combiner.
Parameter name
Setting option
Explanation
NightMode
0
Deactivated (Default)
1
Activated
5.1.3
Active Power Limitation for Reactive Power Feed-In
Some grid codes require that the PV system can also be operated during feed-in of nominal reactive power at nominal
active power. Example: A PV system is required to have a controllable power factor (PF) between ±0.9 and 1.0
without affecting the generation of active power. Thus, the nominal active power is no longer 100% but rather 90% so
that the parameter
P_LIM_IF_Q
should be set to 90%.
Parameter name
Setting option
P_LIM_IF_Q
80% to 100% (default: 100%)
5.1.4
Nominal Apparent Power at Point of Common Coupling (PCC)
All grid management services in the inverter are based on the nominal apparent power at the point of common
coupling. Example: At an active power limitation to 50%, the active power at the point of common coupling is limited
to 50% by
Sgrid_nom
. The default value is "blank" meaning that the PV system uses the sum of apparent power from
the commissioned inverters. In some cases the installed power of the PV system is higher than agreed upon with the
distribution grid operator. Thus, the
Sgrid_nom
parameter should be set according to the contract clauses. In cases
where the PV system is installed to supply local loads (this requires an external power meter) and no active power is
allowed to be fed into the grid, the
Sgrid_nom
parameter should be left "blank" and the parameter
P_ref
should be
set to 0%.
Parameter name
Setting option
Sgrid_nom
blank, 0 kVA to 4000 kVA (default: blank)
5.1.5
Voltage Differences Between the Point of Common Coupling (PCC) and the
PV System
This parameter serves to compensate for possible voltage differences on the cables between the inverters and the PCC
and is called up in the case where voltage-based control modes are used, i.e. Q(U), PF(U) and P(U). Thus, only a
single characteristic curve is required for different PV systems and only the parameter
UNOMOffset
(line to line
voltage) needs to be set for each PV system.
Parameter name
Setting option
UNOMOffset
0, generally between ±10 V for low-voltage grids and
±1000 V for medium-voltage grids (default: 0)
Summary of Contents for SHP 75-10
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