# DIgSILENT

## Knowledge base

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### How do I model the harmonic impedance of the network?

For being able to consider frequency dependent network impedances you may use the Voltage Source element (ElmVac) or the External Grid element (ElmXnet). On the Harmonics-page, frequency…

### How do I model a ripple control system in a substation?

In the attached project (RippleControl.pfd) two different methods of modelling ripple control systems are illustrated: The study case "Serial Infeed" shows the simplified way by just inserting a…

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### How can I simulate harmonic voltage distortion resulting from the feeding grid?

There are two ways to simulate the harmonic voltage distortion from the feeding grid: To model the infeed as a voltage source and entering the harmonics on the Harmonics page. To model the infeed as…

### What are the options of the harmonic model of a PWM Converter?

The PWM converter model can either represent a harmonic current source or a harmonic voltage source. If you select the option "Constant I", the specified harmonic spectrum is injected as harmonic…

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### How can I set characteristics using an external file?

You may use the Time Characteristic with data acquisition from a file. To use it you have to define a Time Characteristic of type ChaTime and choose the path and the format of the external file. This…

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### Do you have an example for FACTS, e.g. a TCSC model (Thyristor Controlled Series Capacitor)?

Attached is an example (ExampleTCSC.pfd) for an Tyristor Controlled Series Capacitor (TCSC) including a control to be used with RMS simulations.This model does not allow you to perform small-signal…

### What options are available to implement a measurement in a dynamic simulation?

The options available are the following: Voltage Measurement Device and Current Measurement Device (StaVmea and StaImea). These elements implement the measurement of time-dependent data of a…

### Do you have an example for modelling a SVS/SVC (Static var system/compensator)?

The attached files illustrate two model implementations (SVCExampleWithoutSVSInterface.pfd and SVCExampleWithInterface.pfd): individual control or synchronized control of parallel SVS devices: 1.…

### How can I model a permanent exciter synchronous machine?

For load -flow analysis enter the synchronous machine as a voltage source, using the steady-state impedances (Xd) and the magnitude of the no-load voltage. This represents the behaviour of the…

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### Do you have an example for a wind turbine driving an asynchronous machine?

In the attached example (FixedSpeedWTG.pfd) an induction generator with the necessary dynamic models is shown. The reactive power is balanced using a switched capacitor. The dynamic models are a shaft…