Add new performance index calculation method - avoiding false low performance alarms
With the current definition of the performance index (PI = P act/P pot) and the way it is used in the low performance alarm ("average the PI in the period x if the average wind speed is above y") - we often see false alarms due to too high performance index volatility and especially PIs dropping at low wind speeds. This could be solved with a PI definition that focuses on the difference between P act and P pot rather that the ratio P act/P pot - the modified formular being PI mod = (P rated – (P pot - P act)) / P rated . Considering the implementation in Breeze - it would probably be best to have the two options (PI - PImod) in the configuration and allow the user to choose.
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Jan-Hendrik Schröder
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