CN104638918A - 一种光伏系统降压升压变换器 - Google Patents

一种光伏系统降压升压变换器 Download PDF

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Publication number
CN104638918A
CN104638918A CN201310560984.4A CN201310560984A CN104638918A CN 104638918 A CN104638918 A CN 104638918A CN 201310560984 A CN201310560984 A CN 201310560984A CN 104638918 A CN104638918 A CN 104638918A
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China
Prior art keywords
voltage
buck
circuit
photovoltaic
photovoltaic system
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CN201310560984.4A
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English (en)
Inventor
庞党锋
王创荣
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Tianjin University of Technology
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Tianjin University of Technology
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Priority to CN201310560984.4A priority Critical patent/CN104638918A/zh
Publication of CN104638918A publication Critical patent/CN104638918A/zh
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Photovoltaic Devices (AREA)

Abstract

一种光伏系统降压升压变换器，该电压变换器可以将光伏系统中光伏阵列输出的直流电压，通过Buck和Boost型DC／DC直流斩波电路，变换成输入输出电流连续，输出电压范围大的可调直流电源，输出电压可以大于和小于输入电压，且可以通过调节开关管的工作状态，校正变换器的功率因数。

Description

一种光伏系统降压升压变换器
所属技术领域
本发明专利为一种光伏系统降压升压变换器，应用于光伏发电系统。
背景技术
太阳能光伏发电由于其可再生性、清洁性、用之不尽等特点，正在发展成为世界能源组成中的重要部分。户用离网式光伏发电系统主要为大电网较远的用户提供照明、冷藏及其他一些对电能质量要求不是十分苛刻的简单家用电器，以保证其日常生活需要。在地广人稀大电网并没有接通的地区，人民的日常生活质量由于缺乏电能而下降，离网光伏发电系统逆变电路可以为电能匮乏，光照充足的地区提供电能，现有的电压变化器控制复杂，成本高，且输出的电压范围较窄。
发明内容
为了改善现有光伏系统中电压变换器成本高，控制复杂，输出电能质量不高的特点，本发明提出了一种光伏系统电压变换器，该电路可以通过光伏阵列将光能转化为电能，Buck型DC／DC电路和Boost型DC／DC电路将光伏阵列输出的电压变换成输入输出电流连续、输出电压范围可调直流电压，且输出电压可以大于和小于输入电压，还可通过调节开关管的工作状态，校正用电系统的功率因数。
本发明所采用的技术方案是：Buck型DC／DC电路使电压变换器输出电压的可调，输出电流的连续性增加，后级Boost型DC／DC电路在该电路中将光伏阵列输出的电压进行升压和隔离，使输出电压范围扩大，通过控制Boost变换器的开关管达到提高功率因数的特点，后级的，变换器中的开关管采用频率可调占空比一定的脉冲触发控制，Buck与Boost变换器中的电感在变换器中起到储能和滤波，并联电容器使输出电压更加稳定平滑，使光伏系统可输出电压可调范围广、输出电流连续的直流电压。
本发明的有益效果是，提高光伏系统电压变换的质量，变换器控制简单，成本低，且可以校正系统功率因数，节约能源。
附图说明
下面结合附图和实施例对本发明进一步说明。
图1是本发明的系统框图。
具体实施方式
在图1中，光伏阵列在光照下将光能转换成电能，Buck型DC／DC电路使电压变换器输出电压的可调，输出电流的连续性增加，后级Boost型DC／DC电路在该电路中将光伏阵列输出的电压进行升压和隔离，使输出电压范围扩大，通过控制Boost变换器的开关管达到提高功率因数的特点，后级的，变换器中的开关管采用频率可调占空比一定的脉冲触发控制，Buck与Boost变换器中的电感在变换器中起到储能和滤波，并联电容器使输出电压更加稳定平滑，使光伏系统可输出电压可调范围广、输出电流连续的直流电压。
在Buck型DC／DC电路中，光伏阵列输出电压的正端“+”连接熔断器FU的一侧，FU的另一侧连接Q1开关管FGA25N120的集电极，Q1的发射极连接电感L1的一端和二极管D1的阴极，二极管D1起到续流的作用，C1与C2并连后另一端连接开关管Q1的发射极，电容器C1和C2作为滤波电容器，并联后一端与L1的另外一端相连，C1和C2的另一端与光伏阵列的负端“-”相连，C1和C2使Buck电路输出的电压平滑。
在Boost型DC／DC电路中，电感L2起到储能的作用，Q2开关管的集电极连接L2的一端，Q2的发射极连接到光伏阵列的负端，二极管D2的阳极连接开关管Q2的集电极，电容器C3与C4并连后，一端与二极管D2的阴极连接，另一端连接到Q2的发射极。R为变换器电路的负载，并联在C4的两端。

Claims (2)

1.一种光伏系统降压升压变换器，该电路可以通过光伏阵列将光能转化为电能，Buck型DC／DC电路和Boost型DC／DC电路将光伏阵列输出的电压变换成输入输出电流连续、输出电压范围可调直流电压，且输出电压可以大于和小于输入电压，还可通过调节开关管的工作状态，校正用电系统的功率因数。
2.根据权利要求1所述一种光伏系统电压变换器，其特征是开关管采用的型号是FGA25N120。
CN201310560984.4A 2013-11-08 2013-11-08 一种光伏系统降压升压变换器 Pending CN104638918A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105375518A (zh) * 2015-11-17 2016-03-02 中国科学院广州能源研究所 一种光伏mppt模糊控制方法及系统
CN110323783A (zh) * 2019-07-24 2019-10-11 阳光电源股份有限公司 光伏并网逆变器及其控制方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105375518A (zh) * 2015-11-17 2016-03-02 中国科学院广州能源研究所 一种光伏mppt模糊控制方法及系统
CN110323783A (zh) * 2019-07-24 2019-10-11 阳光电源股份有限公司 光伏并网逆变器及其控制方法

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Application publication date: 20150520