Method for switching power optimizers for photovoltaic module among different working modes

A power optimizer, working mode technology, applied in photovoltaic modules, photovoltaic power generation, electrical components, etc., can solve problems such as power generation efficiency decline and current mismatch

Active Publication Date: 2019-03-05
FONRICH NEW ENERGY TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the inconsistent characteristics of photovoltaic modules in the array, it is easy to cause current mismatch problems, resulting in a significant drop in the overall power generation efficiency of the system

Method used

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  • Method for switching power optimizers for photovoltaic module among different working modes
  • Method for switching power optimizers for photovoltaic module among different working modes
  • Method for switching power optimizers for photovoltaic module among different working modes

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Embodiment Construction

[0047] Below in conjunction with each embodiment, the scheme of the present invention is clearly and completely set forth, and the described embodiment is only the embodiment that the present invention is used for describing and illustrating but not all embodiments, based on these embodiments, people in the art The solutions obtained by technicians without creative work all belong to the protection scope of the present invention.

[0048] In a switching power supply system, the power supply usually uses a power semiconductor device as a switching element, and the output voltage is adjusted by controlling the duty cycle of the switching element by periodically turning on and off the switch. The switching power supply is mainly composed of input circuit, conversion circuit, output circuit and control unit. Power conversion is its core part, mainly composed of switching circuits, and in some cases, transformers are also applied. In order to meet the requirements of high power de...

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Abstract

The invention relates to a method for switching power optimizers for photovoltaic modules among different working modes. A battery serial group comprises multiple photovoltaic modules in serial connection, each photovoltaic module is configured with a power optimizer for executing the maximum power point tracking, the power optimizers corresponding to various photovoltaic module in the battery serial group are serially connected to form a link and provide series voltage; the series voltage provided by the link affiliated power optimizer in a to-be-switched working mode is transiently short-circuited, and the variable quantity of the predetermined index induced by the short-circuit of the series voltage in the transiently short-circuited link is detected, when the variable quantity meets apreset variant condition, the power optimizer in the to-be-switched working mode is completely switched to the other working mode from one working mode.

Description

technical field [0001] The present invention mainly relates to the field of photovoltaic power generation. To be precise, it involves the use of voltage conversion circuits or power optimizers that can realize step-down and step-up or buck-boost in applications containing photovoltaic cells. Determines whether the voltage converter switches between safe operating mode or maximum power point tracking mode, etc. Background technique [0002] The output of individual photovoltaic modules is often not enough to provide the actual power demand, so it is necessary to form an array of photovoltaic modules in series and parallel to meet the design requirements. When selecting photovoltaic modules to form an array, it is usually encountered that the output power of the series-parallel connection is less than that of a single module due to factors such as inconsistent electrical parameters of the series-parallel components or partial or intermittent shading or aging of the strings. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/30
CPCH02S40/30Y02E10/50
Inventor 张永
Owner FONRICH NEW ENERGY TECH LTD
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