julmou Posted March 25, 2022 Share Posted March 25, 2022 Hello, I have been simulating the use of Power Factor on a 20MW solar farm. The inverters used are 20x SMA Sunny Central 1000CP XT. I have checked the inverter definition and it allows power factor specification, with nominal AC power being apparent power (kVA), in the output parameters. Now, once I'm happy with the whole system, I used the Energy Management section, and specified to "Use Power factor for grid injection" with a tan (phi) = -0.484, and cos (phi) = 0.9, so a Leading power factor. So far so good. Now, the results in the Simulation confuse me a bit. The active energy is all good (obviously more overload loss but it's okay). But I can't interpret well the two values at the bottom of the loss diagram , please see the attached screenshot. Quote 20.87 kVAR Reactive energy from the grid: Aver. cos(phi) = 0.894 46.64 kVA Apparent energy to the grid First of all, is this energy or power?.... Either it's energy and then the units should be kVARh and kVAh, or it's power but then is this the average power over the whole year, the constant reactive power that's generated, or something else? Second, if my system is leading (so "producing reactive power"), I don't understand why it says "Reactive energy from the grid". I tried then to simulate with a Lagging power factor (tan (phi) = +0.484, and cos (phi) = 0.9), so if it's lagging (like a motor/inductance) it's "consuming" reactive energy from the grid. And this time, the simulation report indicates "Reactive energy to the grid". So I'm really confused... Link to comment Share on other sites More sharing options...
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