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Glowworm improved algorithm for photovoltaic maximum power point tracing under partial shadow

A technology of maximum power point and firefly algorithm, which is applied in photovoltaic power generation, instruments, regulating electrical variables, etc., and can solve problems such as misjudgment and changes in output characteristics of photovoltaic cells.

Active Publication Date: 2018-10-23
NORTHEAST DIANLI UNIVERSITY +2
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Problems solved by technology

Cloud cover, dust on the surface of photovoltaic cells, trees or buildings make the illumination uneven, resulting in changes in the output characteristics of photovoltaic cells, and multiple extreme points appear on the voltage power output curve, which makes it possible for the traditional maximum power point tracking algorithm (MPPT) to Misjudgment occurred

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  • Glowworm improved algorithm for photovoltaic maximum power point tracing under partial shadow
  • Glowworm improved algorithm for photovoltaic maximum power point tracing under partial shadow
  • Glowworm improved algorithm for photovoltaic maximum power point tracing under partial shadow

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Embodiment Construction

[0044] A firefly improved algorithm for photovoltaic maximum power point tracking under partial shadow of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments.

[0045] S1: Establish a multi-peak mathematical model of the photovoltaic array under shadow conditions;

[0046] Step S1 is based on the schematic diagram of the series photovoltaic array under partial shading, as shown in the attached figure 1 shown, including:

[0047] S11: Define the voltage and current output characteristic formula of the photovoltaic array under uniform illumination;

[0048] Under uniform illumination, the output characteristics of the voltage and current of the photovoltaic array are:

[0049]

[0050] In the formula, U pv Output DC voltage for photovoltaic array, I pv Output DC current for photovoltaic array; I sc is the short-circuit current of the photovoltaic array, U oc is the open circuit voltage of the...

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Abstract

The invention relates to the technical field of photovoltaic grid connected, and discloses a glowworm improved algorithm for photovoltaic maximum power point tracing under partial shadow. The algorithm is characterized by comprising the following steps that a mathematical model under the circumstance of photovoltaic array shadow is constructed, and a mathematical expression of the outputting powerP of a photovoltaic array is obtained; a fluorescein value represents the outputting power P of the photovoltaic array, the position of a glowworm represents the outputting voltage U of the photovoltaic array, through the specific values of difference values of the optimal target values and the worst function values when the iteration is t and t-1, the variable step size factor s (t) is defined,and the variable step size factor is utilized to replace the fixed step size of a traditional glowworm algorithm; Matlab simulation software is utilized to compare convergence conditions of the improved variable step size glowworm algorithm and the traditional fixed step size glowworm algorithm, and the convergence speed of the initial iteration and the stability of the late iteration can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic grid connection, and relates to an improved firefly algorithm for photovoltaic maximum power point tracking under partial shadow. Background technique [0002] With the widespread application of distributed photovoltaic power generation, the environment in which photovoltaic power generation systems are located has become more and more complex, especially for small and medium-sized photovoltaic systems installed in densely built areas, where partial shadowing is unavoidable. Cloud cover, dust on the surface of photovoltaic cells, trees or buildings make the illumination uneven, resulting in changes in the output characteristics of photovoltaic cells, and multiple extreme points appear on the voltage power output curve, which makes it possible for the traditional maximum power point tracking algorithm (MPPT) to Misjudgment occurred. Therefore, it is necessary to study an effective control met...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 金恩淑于新杨筱凡张家毓崔勇包海龙郭强
Owner NORTHEAST DIANLI UNIVERSITY
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