THE reference for power system transients
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This device is an implementation of the three-phase exponential load model. The load active power and reactive power vary as function of its voltage amplitude and frequency. This device is implemented as described in [1]. It allows to perform classical and sophisticated dynamic-stability studies in EMTP. This device can be used in the load flow and time-domain simulations. During the load initialization, the initial active power and initial reactive power are used to find the load-flow. The load voltage magnitude and phase with update from the load flow results automatically. [1] "Load representation for dynamic performance analysis (of power systems)," IEEE Transactions on Power Systems, vol. 8, no. 2, pp. 472-482, May 1993.
This device measures in real-time the frequency and its variation.
These models contain a 3-phase rectifier (AC/DC) and a 3-phase inverter (DC/AC). The average model (AM) just contains a control circuit that is connected to several controlled sources. The detailled model (DML) contains complete inverter and rectifier models and represents the semi-conductors.
This script contain a function to create a subcircuit.
This devices allow a to add a deadband in a signal. The left and right limits of the deadband are indicated with external signals. The signal is shifted so that there is a continuity at the deadband limits.
This device produce periodically a number randomly with a normal law. To generate it, it uses the Box-Muller methods. To generate the necessary uniform distributions, it uses the park and Miller method. seed: The seed represents the seed of the generator. A same seed will produce the same set of number. Ts: At each time step of Ts, the random number generator will compute another random number. variance: The variance represents the law variance.
EMTP model to generate a square signal with variable amplitude and frequency (controlled input pins)
This device is a linear bloc with two different offsets depending whether input is positive or negative.
If you attach the script to a device, by putting the path of "script.dwj" in the attribute "Script.open.Dev", a window opens when you double-click on the device. This wndow allows to copy the content of a file in the "Modeldata" attribute.
This model suppresses the DC component in the measure of a fault current to keep only the permanent part.
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