High-efficiency photovoltaic module power optimizer

A power optimizer and photovoltaic module technology, applied in photovoltaic power generation, photovoltaic modules, electrical components, etc., can solve problems such as string failure and reduced power generation, and achieve the effect of avoiding failure and increasing power generation

Inactive Publication Date: 2015-04-08
SHENZHEN WINLINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem that the output mismatch of photovoltaic modules leads to the reduction of power generation and the failure of a single module causes the corresponding string to fail to work. Component Power Optimizer

Method used

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  • High-efficiency photovoltaic module power optimizer

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Embodiment Construction

[0030] The main components of the optimizer include controller, DC / DC converter, current sensors CT1, CT2, voltage sensors VT1, VT2, VT3, VT4, semiconductor electronic switches K1, K2, K3 and K4, communication interface, etc.

[0031] The circuit topology of the DC / DC converter can be LLC resonant converter, BUCK converter, BOOST converter, BUCK-BOOST converter, flyback converter and forward converter, etc.

[0032] When the DC / DC converter is working, it simulates the output characteristics of photovoltaic cells, so the output is in current source mode.

[0033] In order to allow the photovoltaic module optimizer to achieve the highest possible conversion efficiency, the DC / DC converter can use an LLC series resonant converter. The principle is as follows Figure 4 As shown, the complete photovoltaic module optimizer principle using LLC series resonant converter is as follows Figure 5 shown.

[0034] The output of the photovoltaic cell module is connected to the primary si...

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Abstract

The invention discloses a high-efficiency photovoltaic module power optimizer. The optimizer comprises a controller, a DC/DC converter, a current sensor, a voltage sensor, semiconductor electronic switches K1, K2, K3 and K4, a communication interface and the like. The controller samples the data of the voltage and the current of a photovoltaic module, and the data of the output voltage and the output current of the DC/DC converter, and calculates the maximum output power of the photovoltaic module in real time according to sampled data, and at last, the controller sends out a PWM signal to drive the DC/DC converter to carry out energy conversion. The controller further judges whether substrings of the photovoltaic module and the module are abnormal or not according to the sampled current data and voltage data, and when a fault happens, the substring or the module which breaks down is bypassed. Therefore, the power generation quantity of a photovoltaic power generation system is increased, and the situation that because a photovoltaic module breaks down or module substrings break down, the whole photovoltaic set string loses efficacy is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to the technical field of photovoltaic module application. Background technique [0002] Most of the photovoltaic power generation system is composed of photovoltaic cell modules in series / parallel to form a photovoltaic array. The output of the photovoltaic array is converged to the DC bus of the photovoltaic grid-connected inverter through the combiner box and the DC power distribution cabinet. The inverter converts the direct current into alternating current. Transformer output to grid. [0003] The maximum power generation efficiency of the photovoltaic power generation system is realized by the maximum power point tracking MPPT (maximum power point tracking) control of the entire photovoltaic array by the inverter. The discreteness of photovoltaic cell module parameters, the inconsistency of the installation angle of photovoltaic cell panels, shadows, sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/34
CPCH02S40/00Y02E10/50
Inventor 朱建国杨惠坤
Owner SHENZHEN WINLINE TECH
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