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A two-stage series photovoltaic power optimizer system without communication floating charge control method

A technology of power optimizer and control method, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve problems such as high cost and complex system structure

Active Publication Date: 2021-02-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a two-stage series-connected photovoltaic No-communication float charge control method for power optimizer system

Method used

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  • A two-stage series photovoltaic power optimizer system without communication floating charge control method
  • A two-stage series photovoltaic power optimizer system without communication floating charge control method
  • A two-stage series photovoltaic power optimizer system without communication floating charge control method

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Embodiment Construction

[0026] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] The front stage of the two-stage series photovoltaic power optimizer system is mainly composed of a power optimizer and photovoltaic panels; the latter stage is composed of a DC converter and a battery system. The present invention is illustrated by using three photovoltaic panels and three photovoltaic power optimizers as examples.

[0028] figure 1 It is a two-stage series photovoltaic power optimizer system, which mainly includes three photovoltaic panels, three power optimizers, a DC converter and a battery; the front-stage power optimizer adopts Boost structure, and its main function is to realize the front-stage photovoltaic panel For maximum power point tracking, the output voltage is required to be greater than the input voltage for stable operation. The back-stage DC converter adopts a Buck structure, and its main function is to balan...

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Abstract

The invention relates to the field of distributed photovoltaic power generation, and aims to provide a communication-free floating charge control method for a two-stage series photovoltaic power optimizer system. Including: the DC converter of the latter stage controls the DC bus voltage at the set voltage level according to the output voltage of the battery, and transmits the charging status of the battery system to the front stage through the change of the DC bus voltage; the photovoltaic power optimizer controls the DC bus voltage according to the DC bus voltage. Changes to determine whether to perform maximum power point tracking: when the battery voltage reaches the preset upper limit of the floating charging voltage, the maximum power point tracking is stopped; when the battery voltage drops to the preset lower limit of the floating charging voltage, the maximum power point tracking is started Tracking, the photovoltaic power optimizer outputs power to the rear stage, and the battery voltage continues to rise. The invention does not require additional communication modules between the front and rear stages, can realize the self-adaptation to the floating charging process of the battery system, reduces the complexity of the charging system, and reduces the system cost at the same time.

Description

technical field [0001] The invention relates to the field of distributed photovoltaic power generation, and relates to a non-communication floating charge control method for a two-stage series photovoltaic power optimizer system. Background technique [0002] Solar energy is safe, clean, efficient, sustainable, and widely distributed. The process of photovoltaic power generation will not produce any polluting gases. The photovoltaic industry is developing rapidly. The series power optimizer structure is one of many photovoltaic power generation system structures. The power optimizer controls the output voltage of photovoltaic cells to achieve maximum power point tracking (MPPT). The output terminals are connected in series to form a DC bus and then connected to the subsequent system. The series power optimizer structure can effectively solve the mismatch problem caused by shadow shading and component aging, and has the characteristics of modularization, low cost and high fle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02J7/35G05F1/67
CPCG05F1/67H02J7/007H02J7/35Y02E10/56
Inventor 陈敏傅钰泰齐继志张兴华
Owner ZHEJIANG UNIV