CN104638965A - 一种离网光伏发电系统逆变电路 - Google Patents

一种离网光伏发电系统逆变电路 Download PDF

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CN104638965A
CN104638965A CN201310563507.3A CN201310563507A CN104638965A CN 104638965 A CN104638965 A CN 104638965A CN 201310563507 A CN201310563507 A CN 201310563507A CN 104638965 A CN104638965 A CN 104638965A
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voltage
inverter circuit
circuit
generating system
system inverter
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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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    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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

Abstract

一种离网光伏发电系统逆变电路，该电路可以通过太阳电池板将光能转化为电能，逆变电路将直流电压转换为家用电器的交流220V／50Hz电压供用户使用，DC／DC变换电路和DC／AC变换电路的驱动信号分别来自TL494控制电路的PWM脉冲和TMS320F的SPWM脉冲，电路效率高，实现输出电能的稳定。

Description

一种离网光伏发电系统逆变电路
所属技术领域
本发明专利为一种离网光伏发电系统逆变电路，应用于离网式光伏发电系统。
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家电使用的交流220V/50Hz的电能。
发明内容
为了改善离大电网较远电能匮乏地区的缺电状况，本发明提出了一种离网光伏发电系统逆变电路，该电路可以通过太阳电池板将光能转化为电能，逆变电路将直流电压转换为家用电器的交流220V/50Hz电压供用户使用，DC／DC变换电路和DC／AC变换电路的驱动信号分别来自TL494控制电路的PWM脉冲和TMS320F的SPWM脉冲，电路效率高，实现输出电能的稳定。
本发明所采用的技术方案是：DC／DC变换器在该电路中采用高频变压器将太阳电池的电压进行升压和隔离，变换器的转换电路采用推挽逆变电路，驱动信号是TL494发出的2路20KHz的PWM脉宽调制波，PWM的脉冲根据采集到输出的电压和电流进行反馈调节，实现最大功率点的输出，经过全桥整流电路将高频变压器副边输出的交流电压转换成直流电压，全桥整流后的电感起滤波作用，使输出的直流电压更平滑，DC／AC变换器将直流电压转换为家用电器使用的频率为50HZ电压为220V±10V的交流电压，逆变器的驱动信号为基于TMS320F控制电路发出的SPWM信号，达到输出电压为家用负载可用电源。
本发明的有益效果是，方便的为离大电网较远光照充足的偏远地区提供电能，电路简单，采用该电路可以改善电能匮乏地区人用电情况。
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。
图2是本发明的主电路图。
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，DC／DC变换器在该电路中采用高频变压器将太阳电池的电压进行升压和隔离，变换器的转换电路采用推挽逆变电路，驱动信号是TL494发出的2路PWM脉宽调制波，PWM的脉冲根据采集到输出的电压和电流进行反馈调节，实现最大功率点的输出，经过全桥整流电路将高频变压器副边输出的交流电压转换成直流电压，全桥整流后的电感起滤波作用，使输出的直流电压更平滑，DC／AC变换器将直流电压转换为家用电器使用的频率为50HZ电压为220V±10V的交流电压，逆变器的驱动信号为基于TMS320F控制电路发出的SPWM信号，输出户用电能。
在图2所示主电路图中，DC-DC变换电路高频变压器原边电路包括蓄电池V1和场效应管晶体管Q5、Q6和二极管D9、D10。Q5与D9并联，D9为续流作用；Q6与D10并联，D10为续流作用。Q5与Q6的源极连接光伏阵列的正端，Q5与Q6的漏极连接光伏阵列的负端。
DC／DC变换电路高频变压器副边电路包括ZP50A型号二极管D1、D2、D3、D4、电感L1和电容C1，D1与D2连接，D3连接D4，四个二极管组成桥式整流电路，将交流电压，整流成脉动的直流电压，电感L1连接在D3与D4中间起到滤波的作用，使输出的电流平滑，C1连接L1，作用将输出电压滤波为平滑的直流电压。
DC／AC逆变电路包括Q1、Q2、Q3、Q4四个IGBT和D5、D6、D7、D8四个二极管，Q1连接Q2，Q3连接Q4，组成逆变全桥，MURF860型号二极管D5、D6、D7、D8分别并联在IGBTQ1、Q2、Q3、Q4一侧，起到续流作用。
电感L2连接在Q1与Q2的中间，起到输出电流的平滑。

Claims (4)

1.一种离网光伏发电系统逆变电路，其特征在于：DC／DC变换器在该电路中采用高频变压器将太阳电池的电压进行升压和隔离，变换器的转换电路采用推挽逆变电路，驱动信号是TL494发出的2路20KHz的PWM脉宽调制波，PWM的脉冲根据采集到输出的电压和电流进行反馈调节，实现最大功率点的输出，经过全桥整流电路将高频变压器副边输出的交流电压转换成直流电压，全桥整流后的电感起滤波作用，使输出的直流电压更平滑，DC／AC变换器将直流电压转换为家用电器使用的频率为50HZ电压为220V±10V的交流电压，逆变器的驱动信号为基于TMS320F控制电路发出的SPWM信号，达到输出电压为家用负载可用电源。
2.根据权利要求1所述一种离网光伏发电系统逆变电路，其特征是整流桥后同时连接串联电感L1和并联电容C1滤波。
3.根据权利要求1所述一种离网光伏发电系统逆变电路，其特征是二极管D1、D2、D3、D4采用的型号是ZP50A。
4.根据权利要求1所述一种离网光伏发电系统逆变电路，其特征是二极管D5、D6、D7、D8采用的型号是MURF860。
CN201310563507.3A 2013-11-08 2013-11-08 一种离网光伏发电系统逆变电路 Pending CN104638965A (zh)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105093954A (zh) * 2015-08-31 2015-11-25 成都科创城科技有限公司 采用混合能源的智能家居无线感应式手环式语音采集装置
CN105137792A (zh) * 2015-08-31 2015-12-09 成都科创城科技有限公司 一种智能家居系统混合能源供能的视频采集装置
CN105182771A (zh) * 2015-08-31 2015-12-23 成都科创城科技有限公司 采用混合能源的智能家居系统的手环语音指令采集装置
CN108490293A (zh) * 2018-03-23 2018-09-04 天津职业技术师范大学 一种三相逆变器的检测电路及控制方法
CN110557041A (zh) * 2019-10-11 2019-12-10 徐州核润光能有限公司 光伏逆变器控制方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105093954A (zh) * 2015-08-31 2015-11-25 成都科创城科技有限公司 采用混合能源的智能家居无线感应式手环式语音采集装置
CN105137792A (zh) * 2015-08-31 2015-12-09 成都科创城科技有限公司 一种智能家居系统混合能源供能的视频采集装置
CN105182771A (zh) * 2015-08-31 2015-12-23 成都科创城科技有限公司 采用混合能源的智能家居系统的手环语音指令采集装置
CN108490293A (zh) * 2018-03-23 2018-09-04 天津职业技术师范大学 一种三相逆变器的检测电路及控制方法
CN110557041A (zh) * 2019-10-11 2019-12-10 徐州核润光能有限公司 光伏逆变器控制方法

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