Kaco blueplanet gridsave 110 TL3-S Manual Download

Page: 71 / 93

The availability or the adaptability of the functions may be limited depending on the country setting selected.
This is particularly true if the applicable grid connection guideline makes this restriction compulsory.

Dynamics / accuracy

In all of the control methods described below the specified target value at the inverter’s connection terminals
is adjusted using a stationary deviation of the reactive power of maximum 2%

SN.

The transient response of the control methods is determined by a PT-1 filter. In this case, the settling time cor-
responds to 5 Tau, or in other words, achieving approx. 99% of the final value for a PT-1 filter. Subject to the
control method selected, there are also other parameters that determine dynamic behaviour.

Methods for active power regulation

Methods for regulating the active power of feed-in inverters may be necessary for local management of load
flows, for voltage stability in the distribution network and for ensuring the stability of the interconnected grid.

The device makes use of the following functions in order to regulate the active power. These are described in
the following section:

– P target value (MPPT(communication))

– P limit (communication) P limit

– P(U) (characteristic curve) [See section 10.2.1

}

Page 71]

– P(f) (characteristic curve) [See section 10.2.2

}

Page 73]

10.2.1 Voltage-dependent power reduction P(U)

If it is not possible to compensate adequately for voltage increase in the upstream distribution network by con-
sumption of reactive power, it may be necessary to curtail the active power. In this case, P(U) control is avail-
able for making optimum use of the capacity of the upstream grid.

P(U) control reduces the active power that is fed-in as a function of the grid voltage using a prescribed charac-
teristic curve as a basis. The P(U) control is implemented as an absolute power limit. The actual power of the
inverter may vary freely below this limit based on possible fluctuation of the available power or set point, but
will never increase above the absolute power limit.

[See figure 55 [

}

Page 71] and [See figure 56 [

}

Page 71] are two example configurations. In case of the Fig-

ure 1 without hysteresis the function is activated once the voltage exceeds the configured voltage of data point
1 (dp1). The power limit follows the characteristic, a straight line between dp1 and dp2. The function is deacti-
vated once the voltage falls below dp1. In case of [See figure 56 [

}

Page 71] the function is activated once the

voltage exceeds the configured voltage of dp2. dp1 is not activating the function in this case as the power limit
remains at 100%. The power limit follows the characteristic, a straight line between dp2 and dp3, but due to
the activated hysteresis, the power limit is not increased at falling voltage. The function is deactivated once the
voltage falls below dp1.

Voltage

Pref

Fig. 55:

Example characteristic without hysteresis

Pref