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Power optimizer

A power optimizer and controller technology, applied in the field of power devices, can solve the problems of photovoltaic cell efficiency loss, failure of battery panels, loss of electric energy and power generation, etc.

Active Publication Date: 2016-09-21
FONRICH NEW ENERGY TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When some cells in the same string fail to generate electricity due to poor product consistency or shadow occlusion, the efficiency of the entire string of photovoltaic cells will suffer a serious loss, and the inverter, especially the centralized inverter When there are many connected battery panel arrays, the battery panels of each string will not be able to operate at their maximum power point, which is a loss of electric energy and power generation

Method used

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Embodiment Construction

[0058] see figure 1 , take the battery strings CELL-ST1~CELL-ST3 arranged on the photovoltaic module as an example to illustrate the spirit of the invention of the present invention, note that the specific number of battery strings on the photovoltaic board is only for our description, and does not mean that the present invention is only limited in the specific quantities listed. The battery string CELL-ST1 has a plurality of photovoltaic cells 10 connected in series. Generally, the anode of the latter photovoltaic cell 10 is connected to the cathode of the previous photovoltaic cell 10 adjacent to it. The first photovoltaic cell in the battery string is set to The anode of the battery 10 is used as the equivalent anode A1 of the entire battery string CELL-ST1, and the cathode of the last photovoltaic cell 10 in the battery string is set as the equivalent cathode C1 of the entire battery string CELL-ST1. According to the same principle, the battery string CELL-ST2 has an equi...

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Abstract

The invention mainly relates to a power optimizer. The power optimizer is used for performing voltage conversion on a one-stage or multi-stage photovoltaic cell string, and includes one-stage or multi-stage BUCK circuits, wherein first and second input ends of any one stage of BUCK circuit are respectively coupled with an anode end and a cathode end of the corresponding one-stage photovoltaic cell string; and an output capacitor of any one stage of BUCK circuit is connected between a first output node and a second output node of the any one stage of BUCK circuit, so that the output voltage of the single-stage photovoltaic cell string is provided between a first output node and a second output node of a single-stage BUCK circuit, or the total output voltage for the multi-stage photovoltaic cell string is formed between the first output node of the first first-stage BUCK circuit and the second output node of the last last-stage BUCK circuit in the multi-stage BUCK circuits.

Description

technical field [0001] The present invention mainly relates to a power device for photovoltaic power generation. To be precise, it adopts a scheme in which a multi-stage photovoltaic cell string and a multi-stage voltage conversion circuit as a power optimizer are used in each photovoltaic module, so that any one-stage voltage Each conversion circuit can independently perform an independent maximum power point tracking calculation on a corresponding battery string to ensure the stability of the output power of the entire solar power generation system. Background technique [0002] With the shortage of energy and the development of science and technology, new energy has been more and more widely used. Due to the characteristics of safe and reliable photovoltaic power generation, low operating costs, simple maintenance, and usable everywhere, photovoltaic power generation has been rapidly developed worldwide. development, especially in solving the problem of electricity consum...

Claims

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Application Information

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IPC IPC(8): H02S40/30H02S40/32H02S10/00G05F1/67
CPCG05F1/67H02S10/00H02S40/30H02S40/32Y02E10/56
Inventor 张永应剑东
Owner FONRICH NEW ENERGY TECH LTD
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