SMA SHP 75-10, Technical Information

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5 Settings of Grid Management Services SMA Solar Technology AG
Technical Information 19 STP60-SHP75-10-Parameter-TI-en-12
5.3.8 P(V) – Active Power as a Function of Grid Voltage
This control mode uses the grid voltage to generate a threshold for the active power so that the grid voltage can be
controlled at the point of common coupling. The P(V) characteristic curve must be coordinated with the Q(U) or PF(U)
control modes.
Parameter name Setting range Step size
RmpTmsPT1_UP 0.6 s to 3600 s 0.01 s
RmpDecTmm_UP -0.6%/min to -1200 %/min (default) 0.1%
RmpIncTmm_UP 0.6 %/min to 1200 %/min (default) 0.1%
P_of_U U: Grid voltage (independent values) from 80% to 120% of nominal
voltage -
P: Active power (dependent values) from -100% to 100% of nominal
power -
5.3.9 P(f) - Active Power as a Function of Frequency
This is the common type of primary frequency control applied, e.g. as per the BDEW (German Association of Energy
and Water Industries) technical guidelines, with some extensions, see the figure below. By using the parameter
tdelay_on , it is possible to add a delay between the point in time where the frequency reaches its threshold (e.g.
50.2 Hz) and the point in time where the active power starts to decrease. The purpose of this time delay is to reach a
lower sensitivity in terms of transient frequency changes and higher reliability when detecting grid failures. The amount
of generated active power is still sampled and hold at the instant where the frequency exceeds the threshold. Some
grid codes, e.g. CEI 0-16, requires that the generation of active power is kept low in a certain duration after the
frequency has returned back to its normal range. This can be set via the parameter
tdelay_off . Once the frequency is
back to its normal range, the active power is ramped up again with a certain ramp rate. This is done via the parameter
RmpIncTmm_FPReg . Some grid codes, e.g. CEI 0-16, require that the ramp rate is variable. This can be
programmed with the parameter variable.
Hysteresis can be added in the P(f) curve, e.g. as per BDEW, by programming two P(f) characteristic curves with the
same values. Information: Active power will not start to increase again before the output value from the reference table
is equal to 100%.
Parameter name Setting range Step size
tdelay_on 0 s to 2 s (default: 0) 0.01 s
tdelay_off 0 s to 600 s (default: 0) 0.01 s
RmpIncTmm_FPReg 0.6%/min to 1200%/min 0.1%
Variable (e.g. as per
CEI 0-16) 0 for constant rate limitation and 1 for variable rate limitation -
FP_of_f FP: Power frequency (independent values) from 45 Hz to 65 Hz -
f: Active power (dependent values) from 0% to 100% of the nominal
power -