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A distributed maximum power tracking integrated control system and method

A technology of maximum power tracking and integrated control system, which is applied in the field of solar photovoltaic power generation, can solve problems such as the reduction of power output of photovoltaic systems, and achieve the effect of improving integration and reducing usage

Active Publication Date: 2019-04-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to shadow occlusion caused by leaves, bird droppings, dust, etc. or damage to photovoltaic wafers, some parts of the photovoltaic panel cannot work as expected, resulting in a greatly reduced power output of the DMPPT photovoltaic system based on photovoltaic panels

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  • A distributed maximum power tracking integrated control system and method

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Embodiment Construction

[0016] The system proposed by the present invention comprises three photovoltaic sub-modules. Each photovoltaic sub-module is connected to a Buck converter without inductance. The output terminals of such three Buck converters are connected in series, and the total output terminals are connected to a set of inductors and capacitors L and C for filtering. The voltage of the capacitor C is controlled by the subsequent micro-inverter. A current sensor samples the total output current I of the integrated photovoltaic panel o , as the only input signal of the MPPT control chip, and finally output three PWM signals D 1 ,D 2 ,D 3 Control the three switches separately.

[0017] The following is a detailed description of the system structure and method:

[0018] (1) System structure

[0019] The structural diagram of the present invention is as figure 1 shown. Since a general commercial photovoltaic panel consists of three photovoltaic sub-modules connected in series, the inte...

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Abstract

The invention discloses a distributed maximum power tracing integrated control system and method. By the adoption of the integrated control scheme, it can be ensured that all photovoltaic units output respective maximum power by using a minimum number of passive devices, a control chip and a sensor under the light condition. Compared with existing photovoltaic-level products, the integrated control scheme can completely offset the power loss caused by the mismatch problem in a photovoltaic plate only by using one group of passive devices, one current sensor and one control chip, and the integration level of a photovoltaic optimizer is greatly improved.

Description

【Technical field】 [0001] The invention belongs to the field of solar photovoltaic power generation, and in particular relates to a distributed maximum power tracking integrated control system and method based on a single sensor-single inductance structure. 【Background technique】 [0002] The photovoltaic system based on Distributed Maximum Power Point Tracking (DMPPT) can solve the mismatch problem caused by factors such as shadow shading, stains, thermal gradients, and inclinations between photovoltaic panels, so that all photovoltaic panels can work in their respective maximum power point. [0003] However, due to shading caused by leaves, bird droppings, dust, etc. or damage to photovoltaic wafers, some parts of the photovoltaic panel cannot work as expected, resulting in a greatly reduced power output of the DMPPT photovoltaic system based on photovoltaic panels. [0004] Therefore, we further extend the concept of DMPPT to the photovoltaic sub-module level, and propose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S40/30G05F1/67
CPCG05F1/67H02S40/30Y02E10/56
Inventor 王丰朱田华卓放史书怀贺鑫璐
Owner XI AN JIAOTONG UNIV