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Table 1 The features of indices for error data

From: A power fluctuation evaluation method of PV plants based on RankBoost ranking

Characteristics of error data

The problems of error data

max{Pi,i=1,2,¼N} ≤ 0 or Pi(i=1,2,¼N) is constant

If tinitiation ≤ 0 or tending ≤ 0, the PV power does not raise or fall, and is keeping either constant or zero during the whole day, which does not conform to the daily features of PV power described in Section 2.1.

TDstarting < − 1 h or TDterminal > 1 h

If the initiation time precedes sunrise or the ending time lags the sunset for one hour, it indicates the PV plant starting power generation one hour before the sunrise and continuing one hour after sunset, which is considered unnatural.

TDstarting > 4 h and TDterminal < − 4 h

If the initiation time lags sunrise and the ending time precedes the sunset for more than 4 h, the effective time of PV plant is so short and it becomes meaningless to analyze its fluctuation.

fr < 2

If fr ≥ 2, the day curve of power generally assumes unimodal pattern. If fr < 2, the power experiences continuous increase during the whole day or keeps constant, which is considered error data.