A Method for Calculating the Current of Bifacial Photovoltaic Modules under Mismatch Conditions

Abstract

The invention discloses a method for calculating the current of a double-sided photovoltaic module under mismatching conditions, which includes: checking each photovoltaic battery string, calculating its total voltage, and judging the relationship between the total voltage of the photovoltaic battery string and the bypass diode The size of the breakdown voltage, if the total voltage of the photovoltaic cell string is large, the photovoltaic cell string has passed the inspection, otherwise the bypass diode is activated, and the photovoltaic cell string is bypassed; finally, the mismatch condition is determined according to the remaining normal working photovoltaic cell strings The operating current of the lower double-sided photovoltaic module. By using the method of the invention, as long as the open-circuit voltage, short-circuit current, and series resistance of the solar cells forming the photovoltaic module are known, the working current of the photovoltaic module can be calculated.

Description

technical field [0001] The invention discloses a method for calculating the current of a double-sided photovoltaic module under mismatching conditions, and belongs to the technical field of photovoltaic power generation performance detection. Background technique [0002] During the working process of photovoltaic modules, it cannot be guaranteed that all battery performance parameters are the same. However, because the batteries are connected in series, the current flowing through all the batteries is the same, which leads to the loss of module power and makes the module power output deviate from the maximum power point. Photovoltaic modules reduce the impact of low current batteries by reverse biasing diodes or activating bypass diodes, but this will lead to energy loss in modules. Reverse biasing of the diodes can sometimes cause a hot spot effect that heats up the cell and damages the assembly by burning the EVA and backsheet. Contents of the invention [0003] The i...

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Problems solved by technology

[0002] During the working process of photovoltaic modules, it cannot be guaranteed that all battery performance parameters are the same

However, because the batteries are connected in series, the current flowing through all the batteries is the same, resulting in a power loss of the components and making the power output of the components deviate from the maximum power point

Photovoltaic modules reduce the impact of low current batteries by reverse biasing diodes or activating bypass diodes, but this will lead to energy loss in modules

Reverse biasing of the diodes, which can sometimes cause a hot spot effect, heating up the cell and causing damage to the assembly by burning the EVA and backsheet

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