Method for precisely simulating performance of photovoltaic battery piece

Abstract

The method brings forward a method for precisely simulating performance of a photovoltaic battery piece. According to a solar battery duodiode model, the method comprises following steps: listing an equivalent equation of the output feature of the model; utilizing a Taylor's formula to descend power to solve such that relations between working current piece and working voltage of the battery is changed to be a linear function; and drawing an I-V curve corresponding to the battery piece based on the electricity performance parameter of the battery piece under the standard condition set by a manufacturer and obtaining electricity performance conditions under different working conditions by controlling light intensity and temperature of the battery piece. The method for precisely simulating performance of the photovoltaic battery piece has following beneficial effects: compared with a single-diode four-parameter method, the method has greater accuracy and especially has greater accuracy than a single-diode model under the condition of low irradiance; and the greatest working point basically coincides with parameters provided by the manufacturer within the range of degree of deviation of 2%.

Description

technical field [0001] The invention relates to a method for accurately simulating the electrical performance of a photovoltaic battery sheet, belonging to the technical field of photovoltaic power generation. Background technique [0002] Most of the models currently used to simulate the electrical performance of photovoltaic cells are single-diode models, such as figure 1 As shown, the four-parameter method is widely used, ignoring the parallel resistance R sh Because it has a certain accuracy and is easy to calculate. The literature "Composite method for performance simulation of various types of silicon cell photovoltaic modules, Bai Jianbo, Hao Yuzhe, Zhang Zhen, etc., Acta Solar Energy Sinica, 2014, 35(9): 1586-1591" introduced the five-parameter method for single diode extraction, so that it can be calculated The result is more accurate. [0003] With the expansion of photovoltaic power plants around the world, the electrical performance changes of photovoltaic mod...

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Problems solved by technology

[0003] With the expansion of photovoltaic power plants around the world, the electrical performance changes of photovoltaic modules when they are shaded by dynamic and static shadows have attracted much attention. There are many articles and patents on this research. The literature "Experimental Research on the Output Characteristics of Solar Cell Modules Shaded by Partial Shadows" , Zhang Zhen, Shen Hui, Li Da, Acta Solar Energy Sinica, 2012, 33(1):5-12" introduced the power loss of modules under different proportions of shading, and the literature "Modeling and Output of Photovoltaic Arrays under Partial Shading Conditions Characteristic Research, Zhang Xiang, Wang Shisheng, Power Technology, 2015, 39(1):203-206" introduced the model establishment method of partial shadow, but the single diode simulation method has certain errors in the simulation under low irradiation

The document "Modelling and Simulation of photovoltaic module considering single-diode equivalent circuit model in MATLAB, Dominique.B, Zacharie.K, Donatien.N, Certified Journal, 2008,3(3):493-502" introduces that the double diode model can reduce the low The simulation error under irradiation, but the equivalent circuit equation of the double diode model is quite complicated, the relationship between I-V is nonlinear, and it is an implicit function, how to make it into an explicit function is the focus of the problem

The literature "Display Expression of Dual Diode Model Based on Taylor Expansion, Yang Guihong, Lun Shuxian, Electronic Design Engineering. 2015, 23(23):170-176" proposes to use the Taylor formula to extract parameters to make it an explicit function, but the calculation The method is quite complicated, and it is only based on the five-parameter single diode, which is similar to the seven-parameter method to solve the transcendental equation, and there is no direct derivation of the explicit relationship corresponding to I-V

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