Method and device for determining limited power operation state of photovoltaic station

The invention provides a method and a device for determining a limited power operation state of a photovoltaic field station, and relates to the technical field of photovoltaic power generation. The method comprises the following steps: clustering single-day current curves of a plurality of strings under a first photovoltaic inverter in a photovoltaic station, and determining a normal-class string and at least one abnormal-class string; and judging whether the first abnormal group string is in a limited power operation state or not according to the single-day generating capacity mean value of the normal group string, the single-day generating capacity of the first abnormal group string in the at least one abnormal group string and the first fitting rate and/or the second fitting rate of the single-day current curve of the first abnormal group string and the single-day current mean value curve. According to the invention, whether the single string in the photovoltaic inverter in the photovoltaic station is in