A method for locating mismatching panels of centralized solar inverter modules

Abstract

The invention discloses a mismatching positioning method for a centralized type solar inverter assembly plate. The mismatching positioning method comprises the steps of obtaining six groups of voltage and current measurement values in integral points by each solar assembly plate by means of regulating a solar array external direct current chopping circuit; according to the six groups of measurement values, determining five parameters and shielding reflection amounts by adopting a Newton iteration method; having the same irradiance at any moment, replacing three parameters, which are only affected by temperature changes, in the five parameters with integral point values, and for the two parameters with relatively high influence and one shielding reflection amount, measuring three groups of voltage and current values to determine three equations, and determining parameters and shielding reflection amounts by the iteration method; and determining the number of shielded battery assembly plates of each photovoltaic battery array and the shielding condition of each battery assembly plate according to the shielding reflection amounts corresponding to each photovoltaic battery assembly plate. By virtue of the five parameter models of the solar battery and equation solving, the shielding condition of each assembly plate of the photovoltaic array is determined, so that an effect of rapidly positioning a mismatching position can be achieved.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, in particular to a method for locating mismatching modules of centralized solar inverter modules. Background technique [0002] Mismatch refers to the large difference in electrical properties between the series and parallel components in the photovoltaic cell array, so that the output power of the entire array is less than the sum of the individual cell components. The reasons for the mismatch include: different orientations of components, partial components covered by shadows, mixed connection of battery components with different power levels, manufacturing differences of battery components, etc. [0003] For series components, the total output current will take the minimum value among all the cells, so once the current of one battery component is smaller than other cells, the current of other cells in the entire series array will also decrease, thereby reducing th...

AI Technical Summary

Problems solved by technology

In the traditional household photovoltaic power generation system, it is common to connect several battery modules in series and parallel and output them to an inverter device. In the case of mismatch, the maximum power point will be mistracked and lead to The output power drops significantly

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