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A photovoltaic maximum power point tracking method and tracking device thereof

A technology of maximum power point and tracking device, applied in photovoltaic power generation, instruments, control/regulation systems, etc., can solve problems such as the influence of dynamic response speed, achieve fast response speed, reduce steady-state power loss, and improve steady-state accuracy Effect

Inactive Publication Date: 2020-06-30
XIAN XJ POWER ELECTRONICS TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, since the three-point method needs to collect three cycles of voltage and current values, its equivalent control cycle is three times that of the disturbance observation method, and the dynamic response speed will be affected

Method used

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  • A photovoltaic maximum power point tracking method and tracking device thereof
  • A photovoltaic maximum power point tracking method and tracking device thereof
  • A photovoltaic maximum power point tracking method and tracking device thereof

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings, and the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0036] see image 3 , the tracking method of photovoltaic maximum power point of the present invention comprises the following steps:

[0037] (1) At the initial moment of each control cycle, the photovoltaic array output voltage pv_v and output current pv_i are collected, and the output power pv_p is calculated, and the calculation formula of pv_p is pv_p=pv_v*pv_i;

[0038] (2) According to the control flag quantity M or M in the previous control cycle 0 update the values ​​of Ua, Ub, Uc and Pa, Pb, Pc: when M=2, Uc=pv_v, Pb=Pa, Pa=Pc, Pc=pv_...

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Abstract

The invention discloses a method and device for tracking a photovoltaic maximum power point, and the method comprises the steps: a), collecting an output voltage pv_v and an output current pv_i of a photovoltaic array, and calculating an output power pv_p; b), updating the values of Ua, Ub and Uc and the values of Pa, Pb and Pc according to the values of control flag quantities M and M0; c), calculating the value of M according to the values of Pa, Pb and Pc; d), determining a disturbance step size Deltu and a disturbance voltage reference value Upv_ref according to the value of M or M0 in this period, and then then generating a drive signal to control the output voltage of the photovoltaic array according to the disturbance step length deltu and the disturbance voltage reference value Upv_ref. The device includes an analog quantity acquisition unit, an operation unit, and an execution unit. An equivalent control period of the invention is one-third of the equivalent control period ofan existing three-point method, and the dynamic response speed is fast. The small step disturbance is used in a steady state, the steady-state power fluctuation is smaller, and the steady-state powerloss is small.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a method for tracking a photovoltaic maximum power point and a tracking device thereof. Background technique [0002] The principle of photovoltaic power generation is the "photovoltaic effect". Photovoltaic panels convert solar energy into direct current after being irradiated by sunlight. The relationship between the output voltage and power of photovoltaic panels is called the photovoltaic P-V characteristic curve. This curve is a convex function, and there is a maximum point. The voltage corresponding to this point is the maximum power point voltage, and the power corresponding to this point is the maximum power. The maximum power point voltage of the same photovoltaic panel is not fixed. The open circuit voltage of the photovoltaic panel is greatly affected by light. The stronger the light, the greater the open circuit voltage, and the maximum power point voltage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 黎阳牛化鹏王林黄辉孟向军杨欣然陈雪马贝龙龚培娇
Owner XIAN XJ POWER ELECTRONICS TECH
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