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Question During a 3-phase bolted fault with zero fault impedance (0 Ohm), the inverter current response appears correct, but the measured positive-sequence active/reactive current components (I1P/I1Q…
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Several things are generally worth to keep in mind when executing an EMT simulation with PowerFactory: 1. Necessity of accurate representations of line models. PowerFactory offers lumped as well as…
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Attached you find an example with 3 unsymmetrical voltage sources. It is required to use 3 symmetrical voltage sources and to connect them to the load busbar using 3 single-conductor cables (phase A…
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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…
To assign a spectrum to the load element, firstly add a load type to the load element and then set the model to current source. The spectrum must be defined and assigned under the Harmonics page of…
An ideal symmetrical system has the following phase shifts for harmonics of the nth order: A: 0° B: -n*120° C: n*120° For the third harmonic, for example, the phase shifts amount to: A: 0° B: -360° C:…
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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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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…
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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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…