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Author: e.malaval
Type: Model
Downloaded: 29 times
Date: 2022-01-19

externally controlled deadband

Description:
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... see more deadband limits.

Tag(s): Model, deadband, hysteresis

Author: e.malaval
Type: Model
Downloaded: 23 times
Date: 2022-01-19

offsets

Description:
This device is a linear bloc with two different offsets depending whether input is positive or negative.

Tag(s): offsets, function, hysteresis

Author: Mihajlo
Type: Model
Downloaded: 126 times
Date: 2020-09-04

Active Harmonic Filter

Description:
The shunt filter injects the current that is defined as the error between the (non-linear) load current and the fundamental harmonic. The filter uses a 3-level inverter and the 2-level hysteresis curr... see moreent control.

Tag(s): filter, AHF, active filter

Author: AdminEMTP-RV
Type: Model
Downloaded: 376 times
Date: 2012-06-18

Ferro_hyst_Zno

Description:
Simple ferroresonance case. In this case the switching of a part of the network comprised of a cable connected to a no-load transformer is carried out. A pole of the breaker fails to open and an impor... see moretant and stable ferroresonance phenomena appears.
The ferroresonance problem, whether in a general circuit or in a power-system circuit, is usually tackled in one of two ways : circuit configuration (i.e series and/or parallel) or nonlinearities (i.e saturation and hysteresis of transformers). A fundamental factor to the occurence of ferroresonance is the nonlinear magnetizing characteristic of the transformer and the capacitive coupling.
In this case a 250 kVA, 20/0.4 kV transformer is used. This transformer is represented by the hysteresis transformer model. The hysteresis element has been used as the magnetization branch of the one-phase transformer model. A 200 m cable is used for the study. This cable is modelled by a PI-section. The short circuit power of the source is about 150 MVA.
In order to reduce overvoltages caused by ferroresonance, surge arresters are installed. Two questions have emerged : will the arresters mitigate ferroresonance, and will they fail during ferroresonance ? Simulations in different transient regimes can be carried out in order to determine the maximal current, overvoltages (voltage at the end of the cable for instance), energy absorbed by the arresters

Tag(s): Protection