Grid integration of big photovoltaic farms with energy storage support
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OriginalversjonSINTEF Energi. Rapport. 18 p. SINTEF Energi AS, 2015
This report deals with two types of network code requirements that apply to bigphotovoltaic installations and cannot be met with the use of inverters but require energystorage.The first of these requirements is frequency response. It prescribes how much the activepower output of a photovoltaic installation should change when system frequencydeviates from the nominal frequency in order to support the grid.The second requirement is the maximum ramping rate which determines by how fast theactive power output of a photovoltaic installation may vary due to changing cloud cover orother factors.The report classifies the network codes into three grades of severity. Two methods to sizethe required storage capacity for different grades of severity are explained withcorresponding examples.The report concludes that improved storage sizing methods should be developed as thereis clear potential for significant reductions in required storage capacity.