Chapter 9. Digital inputs and outputs
9.1. Generator load control
The PS100 inverter, in addition to the turbine run-out protection, is adapted to regulate the frequency of the
generator (and thus the power generated) by switching ON the dump load resistors.
Fig. 9.2. The principle of controlling the dump load resistors shows the principle of controlling the dump load
resistors.
Fig. 9.2. The principle of controlling the dump load resistors
The inverter continuously measures the frequency and voltage of the generator, and compares them to the
saved settings in the inverter's memory (group 10).
To prevent the generator from detaching, use dump load resistors. Parameter 10.3 determines the frequency
threshold of the generator above which the resistors are switched ON for the braking time T
H
, in which the
frequency of the generator drops below the threshold value reduced o hysteresis specified in parameter
10.5, however not shorter than the time set in parameter 10.4.
Additionally the inverter can react to exceeding the voltage thresholds. Parameter 10.2 is used to determine
the voltage level that triggers the activation of load resistors.
In the event of any failure, the system switch ON the dump load resistors.
Table 9.1. Control of the dump load resistors - group 10 (service group, password protected)
No. Name Description
2 "U RMS gen. hamt. [V] Generator RMS voltage from which the "Resistors" load is connected
3 Gen. break. freq. [Hz] Generator frequency from which the "Resistors" load is attached
4 Min. gen. break [s] Minimum switching ON time of a dump load resistors
5 Break hist. off [%] Hysteresis specified in % in relation to the values given in paremeters
10.1 and 10.2
PS100 – User manual 41
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