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Eberhard Waffenschmidt, Ron S.Y. Hui, Soon, virtual inertia for grid control must be covered by photovoltaic inverters. It is suggested to use DC link capacitors for this task. This requires 5 W, 50 J and a capacitor size of about 200 cm³ per installed kW, corresponding to the size of single phase DC link capacitors. It is shown that the additional power ripple (and thus current ripple) is in the order of 0.1% (see figure) and the voltage ripple of the intermediate voltage will typically remain between +/-3.6%. The related control can be easily extended by adding a voltage signal to the control voltage, which is proportional to the frequency deviation. Then, the existing controller inherently sets the required additional power fluctuation required for the virtual inertia function. > Pre-print version: PDF-document
(0.5 MB) > Link to final version (EPE/ECCE participants only): PDF-document |
 Measured grid frequency and calcuated power variation due to virtual inertia operation related to nominal power. The power variation is neglectable compared to the nominal power. |
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Letzte Änderung: E. Waffenschmidt, 9.Sep. 2016 |
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