A multi-peak i-v curve simulation method for series photovoltaic modules

Abstract

The invention discloses a method of simulating a multi-peak I-V curve of series photovoltaic modules. The method comprises the following steps: a, obtaining parameter information of each photovoltaic module in a photovoltaic string under the standard condition; b, figuring up to obtain parameters of each photovoltaic module in an actual environment; c, arranging the actual short circuit current of each photovoltaic module according to the magnitude; d, summing actual open circuit voltage of each module so as to obtain the open circuit voltage of the photovoltaic string; e, simulating each photovoltaic module in sequence so as to obtain an I-V characteristic curve and a simulation length of each module in the photovoltaic string, thereby figuring up to obtain a total simulation length of the photovoltaic string; f, carrying out data completion on the actual short circuit current of each photovoltaic module by adopting a simulation step size unification method; g, selecting a maximum current value, which corresponds to each voltage point, as photovoltaic string output current of the point so as to obtain the multi-peak I-V curve when the photovoltaic string is shielded by a shade. The method does not adopt an iteration method, and the calculated amount of simulation is small; furthermore, judgment of the current magnitude is simplified through the simulation step size unification method.

Description

technical field [0001] The invention relates to the field of modeling and simulation of photovoltaic modules, in particular to a method for simulating multi-peak I-V curves of series photovoltaic modules. Background technique [0002] In recent years, new energy represented by wind energy and solar energy has developed rapidly around the world. As of the end of 2011, the cumulative installed capacity of solar power generation in the world reached 67.4 million kilowatts. Among them, the growth rate of photovoltaic module production is astonishing. In 2010, the shipment of solar cell modules reached 20GW, and in 2011, the shipment of photovoltaic modules reached 27.7GW. It is expected that by 2020 , the annual output of photovoltaic modules will reach 40GW. In this case, the power generation efficiency of the photovoltaic system is also receiving widespread attention, and an important factor affecting the power generation efficiency of the photovoltaic system is the tracking ...

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide a multi-peak I-V curve simulation method for series-connected photovoltaic modules, which can solve the problem of modeling multi-peak I-V curves of photovoltaic modules mainly through voltage value discretization in the prior art, and its model establishment is relatively complicated, resulting in Bring certain difficulties to model solving and simulation

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