34 Program features
Active power limitations
External active power limit
Inverter output power can be limited by defining the maximum output power value using
parameter 130.75 External power limit. The external power limit has ramps defined using
parameters 130.98 External limit ramp up and 130.99 External limit ramp down.
Flat-top limit
External power limit is designed for temporary power limitation. Flat-top limit permanently
limits active power capacity of the inverter to a value lower than nominal. Normally the
inverter has a semi-circular power capacity as the inverter can produce as much active
power as it can produce reactive power. However, with the flat-top limit, this capacity can
be cut by reducing the amount of active power. Note that in the end flat-top is only one
constant active power limit.
Limitation after grid connection and after grid fault
Active power can be limited after a grid connection and after a grid fault. The limitation type
can be selected using parameter 130.70 Startup power ramp type. The limitation can be
set as active always, active only after a grid fault, or never active. There are different ramp
rates for grid connections and re-connections after grid faults. A limitation ramp starts from
0%. A ramp is defined as a percent of nominal power per minute.
Figure 14. After grid connection and after grid fault limitation curve
Nominal power
of the inverter
Not connected
Connected
130.72 After grid fault startup ramp
130.71 Normal startup ramp
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