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Bidirectional Buck transformer-based super capacitor and storage battery hybrid energy storage photovoltaic system

A photovoltaic system and supercapacitor technology, applied in photovoltaic power generation, battery circuit devices, current collectors, etc., can solve the problems of low energy utilization rate of supercapacitors, limited charging and discharging current, low power density, etc., to avoid instantaneous high current Discharge, improve the working state, the effect of high power density

Inactive Publication Date: 2013-08-28
CHONGQING TELECOMMUNICATION INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But no matter what kind of battery has the disadvantages of charge and discharge current limitation, long charging time, short cycle life, and low power density, and supercapacitors have the advantages of high power density, long cycle life, and high charge and discharge efficiency. Therefore, through appropriate energy Management strategy, combining batteries and supercapacitors can form a high-performance energy storage system
In the prior art, the Chinese patent CN101309017A proposes a supercapacitor-battery hybrid energy storage scheme. In this scheme, there is a battery charging circuit between the supercapacitor and the load. When a power pulsating load is set, the advantage of high power density of the supercapacitor is difficult. Full play; Chinese patent CN101789620A proposes a bidirectional Buck / boost circuit topology as an active hybrid energy storage solution, but since the supercapacitor voltage must be higher than the battery voltage, the energy utilization rate of the supercapacitor is not high

Method used

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  • Bidirectional Buck transformer-based super capacitor and storage battery hybrid energy storage photovoltaic system
  • Bidirectional Buck transformer-based super capacitor and storage battery hybrid energy storage photovoltaic system
  • Bidirectional Buck transformer-based super capacitor and storage battery hybrid energy storage photovoltaic system

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Embodiment 1

[0026] Such as figure 1 As shown, the super capacitor and battery hybrid energy storage photovoltaic system based on bidirectional Buck converter includes photovoltaic array, DC / DC converter, super capacitor, battery, bidirectional Buck converter and load; the photovoltaic array, DC / DC converter And the load is connected in sequence, the super capacitor and the bidirectional Buck converter are respectively connected between the DC / DC converter and the load, and the battery is connected with the bidirectional Buck converter.

[0027] Among them, the DC / DC converter chooses a buck, boost or buck-boost converter with maximum power tracking function. The DC / DC converter can use a microprocessor (microcontroller or DSP) to complete MPPT and other control functions.

Embodiment 2

[0029] Such as figure 1 with figure 2 As shown, the super capacitor and battery hybrid energy storage photovoltaic system based on bidirectional Buck converter includes photovoltaic array, DC / DC converter, super capacitor, battery, bidirectional Buck converter and load; the photovoltaic array, DC / DC converter And the load is connected in sequence, the super capacitor and the bidirectional Buck converter are respectively connected between the DC / DC converter and the load, and the battery is connected with the bidirectional Buck converter.

[0030] The two-way Buck converter includes a first power switch tube T1, a second power switch tube T2, a diode one D1, a diode two D2, and an inductor L; the diode one D1 is connected to the cathode of the super capacitor, and the diode two D2 is connected to the cathode of the battery , Diode one D1 and diode two D2 have a common anode, diode one D1 cathode is connected to the source of the first power switch T1, the first power switch T1 dra...

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Abstract

The invention relates to the field of hybrid energy storage photovoltaic systems, in particular to a bidirectional Buck transformer-based super capacitor and storage battery hybrid energy storage photovoltaic system, which comprises a photovoltaic array, a direct current / direct current (DC / DC) transformer, a super capacitor, a storage battery, a bidirectional Buck transformer and a load, wherein the photovoltaic array, the DC / DC transformer and the load are sequentially connected; the super capacitor and the bidirectional Buck transformer are connected between the DC / DC transformer and the load respectively; and the storage battery is connected with the bidirectional Buck transformer. According to the system, the photovoltaic array is high in utilization rate, the charging speed and the efficiency are high, the cycle life is long, the storage energy of the super capacitor can be maximally utilized, and the technical problems of short cycle life of a conventional photovoltaic energy storage system and low energy utilization rate of the super capacitor are solved.

Description

Technical field [0001] The invention relates to the field of hybrid energy storage photovoltaic systems, in particular to a hybrid energy storage photovoltaic system composed of a super capacitor and a battery based on a bidirectional Buck converter. Background technique [0002] As an important part of the new energy industry, photovoltaic energy storage systems have become more and more widely used in recent years. Due to the intermittent and random nature of the output power of photovoltaic cells, a certain energy storage device must be configured in an independent photovoltaic power generation system to ensure the continuity and reliability of the load power supply. The battery is the most common energy storage component. But no matter what kind of battery has the shortcomings of charging and discharging current limit, long charging time, short cycle life, low power density, etc., supercapacitors have the advantages of high power density, long cycle life, and high charging an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/35
CPCY02E10/56
Inventor 张颖超钱希森詹天文聂金铜
Owner CHONGQING TELECOMMUNICATION INSTITUTE
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