Failure detection method for photovoltaic power generation units with multiple same mounting dip angles

The invention discloses a failure detection method for photovoltaic power generation units with multiple same mounting dip angles. The method comprises the following steps: S1, electric parameters of the photovoltaic power generation units are selected as performance parameters; S2, average performance parameters of the photovoltaic power generation units in the sampling period are calculated; S3, normalization processing of data is carried out; S4, performance vectors of the power generation units are calculated; S5, correlation coefficients of the performance vectors and average performance vectors are calculated; S6, in the new sampling period, correlation coefficients of the performance vectors and the average performance vectors of all power generation units of the new sampling period are calculated; S7, a time sequence vector formed by the correlation coefficients is calculated; S8, a threshold value of the time sequence vector is set, and failures or abnormalities of the power generation units are judged. Automatic failure diagnosis is achieved, the failures can be accurately and rapidly found, the failure eliminating time is shortened, the power generation amount is improved, and meanwhile the labor intensity is reduced.