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cosinus phi


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  • 9 months later...


In PVsyst, the Power factor may be specified by pressing the "Energy management" button, either as Cos(phi) or as Tan(phi). It may also be specified in monthly values.

This will act on the inverter Pnom limitation if specified as Apparent power limit, and the apparent energy is mentioned on the loss diagram.

The energy E_grid calculated by the PVsyst simulation is the active (or real) energy, expressed in [kWh].

Now the grid manager may require to produce some reactive energy for compensating the unbalances of the other users (expressed in [kVARh]).

The Apparent energy is the product U * I expressed in [kVAh].

If the voltage is sinusoidal, the active (or real) energy is U * I * cos(phi) [kWh], where phi is the phase shift between current and voltage.

The Power Factor is the ratio of the Active energy to the Apparent energy. In the sinusoïdal case, it is equal to cos(phi).

The phase shift produced by inverters is sometimes expressed as Tan(phi), positive for reactive power generation (capacitive, Phi>0, named "Leading") and negative for reactive power absorption (inductive, Phi<0, named "Lagging").

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