Next two definitions by Ohlendorf & @wpschill.bsky.social, doi:10.1088/1748-9326/ab91e9. A doldrum hour is defined as an hour with mean wind and PV power of less than 10% of installed capacity. A dd event of type cbt10 (const. below threshold) is a period of consecutive doldrum hours. 6/ - ThreadSky

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kopfgold.bsky.social • 104 days ago

Next two definitions by Ohlendorf & @wpschill.bsky.social, doi:10.1088/1748-9326/ab91e9. A doldrum hour is defined as an hour with mean wind and PV power of less than 10% of installed capacity. A dd event of type cbt10 (const. below threshold)
is a period of consecutive doldrum hours. 6/

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kopfgold.bsky.social•104 days ago

A dd-event of type mbt10 (mean below threshold) is a period where mean wind and PV power is less than 10% of installed capacity.
7/

kopfgold.bsky.social•104 days ago

Last but not least a definition proposed by Solardoktor on https://buff.ly/3Pggcwj: A dd event is a period where residual load stays positive after smoothing with batteries and DSM. 8/

kopfgold.bsky.social•104 days ago

I also counted the mean number of doldrum hours, days and weeks per year: 9/

kopfgold.bsky.social•104 days ago

Now forget doldrum counting. The questions we *really* want to answer are: How much storage, how much backup power, how much energy import is necessary. Instead of using data to count DDs, why not address these questions directly? 10/

kopfgold.bsky.social•104 days ago

To determine storage size we must first define the length of a buffer period in which we aim to be independent from imports (if applicable) and then calculate the energy deficit. Inspired by Ruhnau & Qvist I have done this for periods of 10, 30 and 90 days. 10 days: 11/

kopfgold.bsky.social•104 days ago

30 days: 12/

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