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Maximum power point tracking method, mppt controller and photovoltaic power generation system

A maximum power point, controller technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve the problems of slow dynamic response, low accuracy, slow start-up speed, etc.

Active Publication Date: 2019-06-28
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above three methods, the accuracy of the first method is not high, the second and third methods start slowly, and the dynamic response speed is slow when the external environment changes drastically.

Method used

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  • Maximum power point tracking method, mppt controller and photovoltaic power generation system
  • Maximum power point tracking method, mppt controller and photovoltaic power generation system
  • Maximum power point tracking method, mppt controller and photovoltaic power generation system

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Embodiment 1

[0035] Such as figure 1 As shown, the embodiment of the present invention provides a maximum power point tracking method, the method includes the following steps:

[0036] S1: According to the test data of photovoltaic cells, generate a three-dimensional matrix [T i S j u m ], and store the elements in the three-dimensional matrix. Among them, T is the external temperature, S is the light, and U is the output voltage of the photovoltaic cell when the output power of the photovoltaic cell is maximum under the external temperature T and light S.

[0037] In step S1, the three-dimensional matrix [T i S j u m ] can reflect the corresponding relationship between the output voltage of the photovoltaic cell and the external temperature T and light S when the output power of the photovoltaic cell is maximum.

[0038]S2: Real-time sampling of the external temperature T(k) and light S(k) at the current moment, as well as the output voltage U(k) and output current I(k) of the ...

Embodiment 2

[0063] Based on Embodiment 1, this embodiment provides an MPPT controller, such as image 3 As shown, the MPPT controller 1 includes: a data storage module 11 , a data acquisition module 12 , a calculation and comparison module 13 , an output voltage determination module 14 and an output voltage control module 15 connected in sequence.

[0064] Wherein, the data storage module 11 is used to generate a three-dimensional matrix [T i S j u m ], and store the elements in the three-dimensional matrix. Among them, T is the external temperature, S is the light, and U is the output voltage of the photovoltaic cell when the output power of the photovoltaic cell is maximum under the external temperature T and light S.

[0065] The data acquisition module 12 is also connected to the sampling sensor 3 used for real-time sampling of the external temperature T(k) and illumination S(k) at the current moment, as well as the output voltage U(k) and output current I(k) of the photovoltaic ...

Embodiment 3

[0071] Based on Embodiment 1 and Embodiment 2, this embodiment provides a photovoltaic power generation system, such as image 3 As shown, the photovoltaic power generation system includes: a photovoltaic cell array 2 , a sampling sensor 3 and an MPPT controller 1 .

[0072] Wherein, the photovoltaic cell array 2 includes several photovoltaic cells for converting light energy into electrical energy.

[0073] The sampling sensor 3 is connected to the photovoltaic cell array 2 for real-time sampling of the external temperature T(k) and light S(k) at the current moment, as well as the output voltage U(k) and output current I(k) of the photovoltaic cell at the current moment. Sampling sensor 3 In order to sample the aforementioned different types of data, the sampling sensor 3 may include different types of sensors such as temperature sensors, light intensity sensors, current sensors, and voltage sensors.

[0074] The MPPT controller 1 is connected with the photovoltaic cell array ...

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Abstract

The invention provides a maximum power point tracking method, a maximum power point tracking (MPPT) controller and a photovoltaic power generation system and relates to the technical field of photovoltaic power generation. The problems that an existing maximum power point tracking method is not high in precision and slow in speed are solved. The method includes the steps of generating a three-dimensional matrix [Ti Sj Um]; sampling T, S, U and I at a current moment in real time; calculating output power P(k) of a photovoltaic battery at the current moment; calculating |P(k)-P(k-1)|, and comparing |P(k)-P(k-1)| with a threshold value epsilon; if the condition of |P(k)-P(k-1)|>epsilon is met, acquiring an output voltage corresponding to illumination and external temperature at the current moment through table look-up according to the three-dimensional matrix, wherein the output voltage serves as a target output voltage at a next moment; if the condition of |P(k)-P(k-1)|<=epsilon is met,determining a target output voltage at a next moment through a conductance increment method, and controlling an output voltage at the next moment to be changed into the target output voltage. The maximum power point tracking method is applied to the process of controlling the photovoltaic power generation system.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, in particular to a maximum power point tracking method, MPPT (English full name: Maximum Power Point Tracking, Chinese name: maximum power point tracking) controller and a photovoltaic power generation system. Background technique [0002] In recent years, the solar photovoltaic power generation industry has developed rapidly. Photovoltaic cells can convert solar energy into electrical energy to output external power. Since the output P-U characteristics of photovoltaic cells are affected by working conditions such as external temperature and light, the relationship is non-linear, so the relationship between the output power and output voltage of photovoltaic cells is also non-linear. . Usually, the maximum power point tracking technology needs to be used to control the output voltage of the photovoltaic cell array to make it work at the maximum power point. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 杨诚
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD