CN107404110A - 一种非隔离储能三相离网逆变供电系统 - Google Patents

一种非隔离储能三相离网逆变供电系统 Download PDF

Info

Publication number
CN107404110A
CN107404110A CN201710569884.6A CN201710569884A CN107404110A CN 107404110 A CN107404110 A CN 107404110A CN 201710569884 A CN201710569884 A CN 201710569884A CN 107404110 A CN107404110 A CN 107404110A
Authority
CN
China
Prior art keywords
phase
network
energy storage
electric
isolated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710569884.6A
Other languages
English (en)
Inventor
马文长
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHENGDU MOLO ELECTRIC Co Ltd
Original Assignee
CHENGDU MOLO ELECTRIC Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHENGDU MOLO ELECTRIC Co Ltd filed Critical CHENGDU MOLO ELECTRIC Co Ltd
Priority to CN201710569884.6A priority Critical patent/CN107404110A/zh
Publication of CN107404110A publication Critical patent/CN107404110A/zh
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Abstract

本发明公开了一种非隔离储能三相离网逆变供电系统,包括：储能单元：存储电能，提供直流电源；逆变电路单元：接收直流电源，进行三相逆变处理，输出与电网系统参数相同的交流电；所述逆变电路单元输出端连接有非隔离自偶电路，非隔离自偶电路输出端连接有漏电保护切断电路；所述漏电保护切断电路输出端与非隔离储能三相离网逆变供电系统的输出端之间连接有四线制漏电检测电路，四线制漏电检测电路的信号输出端连接漏电保护切断电路的控制端。本发明的大功率储能离网逆变系统效率较传统大功率储能离网逆变系统有4％‑5％的提高。

Description

一种非隔离储能三相离网逆变供电系统
技术领域
本发明涉及大功率储能逆变领域，特别涉及一种非隔离储能三相离网逆变供电系统。
背景技术
随着分布式发电和智能电网的发展，逆变器并联技术已成为一个非常重要的研究。本领域中现有的大功率三相储能离网逆变方案，每根相线的额定电流达到200A以上，都是采用大功率三相变压器做隔离，实现对人身的安全保护；然而这个方案有个严重的问题，那就是整机效率受隔离变压器的影响，有4-5个百分点的下降。在大功率的逆变供电的整体方案中，4-5个百分点的的效率的下降，损失的电能将被放大很多倍，这对储能系统而言严重地影响其运行经济的性能。
此外，逆变供电方案在出现故障时，会自动切除，对负载而言，造成了供电质量不高的问题。
发明内容
本发明的发明目的在于：解决传统大功率三相储能离网逆变供电系统中效率低的问题。针对现有技术存在的问题，提供一种非隔离储能三相离网逆变供电系统。
为了实现上述目的，本发明采用的技术方案为：
一种非隔离储能三相离网逆变供电系统,包括：
储能单元：存储电能，提供直流电源；逆变电路单元：接收直流电源，进行三相逆变处理，输出与电网系统参数相同的交流电；
所述逆变电路单元输出端连接有非隔离自偶电路，非隔离自偶电路输出端连接有漏电保护切断电路；所述漏电保护切断电路输出端与非隔离储能三相离网逆变供电系统的输出端之间连接有四线制漏电检测电路，四线制漏电检测电路的信号输出端连接漏电保护切断电路的控制端。
进一步的方案为：一种非隔离储能三相离网逆变供电系统，还包括提供备用电源的电网；所述电网通过电网供电投切开关与非隔离储能三相离网逆变供电系统的输出端相连接；所述四线制漏电检测电路的信号输出端连接电网供电投切开关控制端。
进一步的方案为：非隔离自偶电路为自耦变压器TB1。
进一步的方案为：电网系统参数包括频率、相序和相位。
进一步的方案为：电网供电投切开关包括交流接触器KM1；漏电保护切断电路包括用于相线的交流接触器KM2和用于零线的交流接触器KM3。
进一步的方案为：四线制漏电检测电路包括：
漏电隔离检测单元：用于与主电的隔离，检测漏电流，产生并输出漏电初始信号；
信号处理和输出单元：接收漏电初始信号进行比较判断，输出漏电信号。
漏电隔离检测单元包括三相四线互感器L1，L1采用高导磁芯，相对导磁率至少为50000，互感器L1的信号输入端分别连接互感器L1的同名端，互感器L1的次级端S1和S2为输出端。
信号处理和输出单元的电路结构为:电压转换电阻R1、比较器U1-A和比较器U1-B，比较器U1-A和比较器U1-B可以选用运算放大器LM358，电压转换电阻R1两端并联滤波电容C1，电容C1的一端接地，另一端连接比较器U1-A的正向输入端和比较器U1-A负向输入端，比较器U1-A的负向输入端和比较器U1-A正向输入端接入电压参考信号。
综上所述，由于采用了上述技术方案，本发明的有益效果是：
1.本发明公开了一种采用非隔离技术的大功率储能离网逆变方案，该方案不仅大幅提高了系统运行效率，同时还保障了对人身的安全保护。传统的大功率储能离网逆变在输出端口通过工频隔离变压器与负载连接，虽然工频隔离变压器可以实现安全的电气隔离，但是工频隔离变压器中，大的负载电流同时通过原边和付边，其工作损耗一直比较大，通常而言其效率一般在90％-94％左右，故传统的大功率储能离网逆变系统效率都不高。本发明的大功率储能离网逆变电路在输出端口是自耦变压器TB1与负载连接，由于自耦降压变压器的降压比例约为在25％，大的负载电流只通过25％的线圈，因此自耦降压变压器的效率可以做得很高约为98.5％-99.2％左右，因此本发明的大功率储能离网逆变系统效率较传统大功率储能离网逆变系统有4％-5％的提高。
2.漏电隔离检测单元中的三相四线互感器L1，在逆变供电系统中发生漏电等故障时，互感器L1的原边的总的磁通量发生改变，互感器L1的付边输出电信号经过电压转换电阻R1转化为电压信号，经过比较器U1-A和比较器U1-B和设定参考电压的比较，输出漏电信号，控制漏电保护切断电路断开，电网供电投切开关闭合，切断了由于逆变供电系统漏电而产生的安全隐患，这样就实现了系统对人身的安全保护和负载不间断供电。
附图说明
图1为四线制漏电检测电路原理图。
图2为本申请电路框图。
具体实施方式
下面结合附图，对本发明作详细的说明。
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
实施例1
图2示出了：一种非隔离储能三相离网逆变供电系统,包括：
储能单元：存储电能，提供直流电源；逆变电路单元：接收直流电源，进行三相逆变处理，输出与电网系统参数相同的交流电；所述逆变电路单元输出端连接有非隔离自偶电路，非隔离自偶电路输出端连接有漏电保护切断电路；所述漏电保护切断电路输出端与非隔离储能三相离网逆变供电系统的输出端之间连接有四线制漏电检测电路，四线制漏电检测电路的信号输出端连接漏电保护切断电路的控制端。一种非隔离储能三相离网逆变供电系统，还包括提供备用电源的电网；所述电网通过电网供电投切开关与非隔离储能三相离网逆变供电系统的输出端相连接；所述四线制漏电检测电路的信号输出端连接电网供电投切开关控制端。
进一步的方案为：非隔离自偶电路为自耦变压器TB1；电网系统参数包括频率、相序和相位；电网供电投切开关包括交流接触器KM1；漏电保护切断电路包括用于相线的交流接触器KM2和用于零线的交流接触器KM3。
实施例2
在实施例一的基础上，
图1示出了：四线制漏电检测电路包括：
漏电隔离检测单元：用于与主电的隔离，检测漏电流，产生并输出漏电初始信号；
信号处理和输出单元：接收漏电初始信号进行比较判断，输出漏电信号。
漏电隔离检测单元包括三相四线互感器L1，L1采用高导磁芯，相对导磁率至少为50000，互感器L1的信号输入端分别连接互感器L1的同名端，互感器L1的次级端S1和S2为输出端。
信号处理和输出单元的电路结构为:电压转换电阻R1、比较器U1-A和比较器U1-B，比较器U1-A和比较器U1-B可以选用运算放大器LM358，电压转换电阻R1两端并联滤波电容C1，电容C1的一端接地，另一端连接比较器U1-A的正向输入端和比较器U1-A负向输入端，比较器U1-A的负向输入端和比较器U1-A正向输入端接入电压参考信号。
信号处理和输出单元的输出端还可以经过接触器驱动电路连接交流接触器KM1、交流接触器KM2和交流接触器KM3。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (6)

1.一种非隔离储能三相离网逆变供电系统,包括：
储能单元：存储电能，提供直流电源；
逆变电路单元：接收直流电源，进行三相逆变处理，输出与电网系统参数相同的交流电；其特征在于，
所述逆变电路单元输出端连接有非隔离自偶电路，非隔离自偶电路输出端连接有漏电保护切断电路；所述漏电保护切断电路输出端与非隔离储能三相离网逆变供电系统的输出端之间连接有四线制漏电检测电路，四线制漏电检测电路的信号输出端连接漏电保护切断电路的控制端。
2.如权利要求1所述一种非隔离储能三相离网逆变供电系统，其特征在于，还包括提供备用电源的电网；所述电网通过电网供电投切开关与非隔离储能三相离网逆变供电系统的输出端相连接；所述四线制漏电检测电路的信号输出端连接电网供电投切开关控制端。
3.如权利要求1所述一种非隔离储能三相离网逆变供电系统，其特征在于，非隔离自偶电路为自耦变压器TB1。
4.如权利要求1所述一种非隔离储能三相离网逆变供电系统，其特征在于，电网系统参数包括频率、相序和相位。
5.如权利要求2所述一种非隔离储能三相离网逆变供电系统，其特征在于，电网供电投切开关包括交流接触器KM1；漏电保护切断电路包括用于相线的交流接触器KM2和用于零线的交流接触器KM3。
6.如权利要求1所述一种非隔离储能三相离网逆变供电系统，其特征在于，4线制漏电检测电路包括：
漏电隔离检测单元：用于与主电的隔离，检测漏电流，产生并输出漏电初始信号；
信号处理和输出单元：接收漏电初始信号进行比较判断，输出漏电信号。
CN201710569884.6A 2017-07-13 2017-07-13 一种非隔离储能三相离网逆变供电系统 Pending CN107404110A (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710569884.6A CN107404110A (zh) 2017-07-13 2017-07-13 一种非隔离储能三相离网逆变供电系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710569884.6A CN107404110A (zh) 2017-07-13 2017-07-13 一种非隔离储能三相离网逆变供电系统

Publications (1)

Publication Number Publication Date
CN107404110A true CN107404110A (zh) 2017-11-28

Family

ID=60405185

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710569884.6A Pending CN107404110A (zh) 2017-07-13 2017-07-13 一种非隔离储能三相离网逆变供电系统

Country Status (1)

Country Link
CN (1) CN107404110A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111224419A (zh) * 2020-03-03 2020-06-02 阳光电源股份有限公司 储能逆变器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2904465Y (zh) * 2006-04-29 2007-05-23 华北电力大学（北京） 一种用于双路供电集成电源的主电路拓扑
CN201408978Y (zh) * 2009-04-24 2010-02-17 北京Abb低压电器有限公司 漏电保护器
CN203312762U (zh) * 2013-05-09 2013-11-27 杭州之江开关股份有限公司 带漏电保护的三相过欠压微型断路器
CN203377585U (zh) * 2013-08-28 2014-01-01 德力西电气有限公司 一种剩余电流保护电路
CN204065253U (zh) * 2014-04-30 2014-12-31 西门子公司 漏电保护器及用于该漏电保护器的测试电路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2904465Y (zh) * 2006-04-29 2007-05-23 华北电力大学（北京） 一种用于双路供电集成电源的主电路拓扑
CN201408978Y (zh) * 2009-04-24 2010-02-17 北京Abb低压电器有限公司 漏电保护器
CN203312762U (zh) * 2013-05-09 2013-11-27 杭州之江开关股份有限公司 带漏电保护的三相过欠压微型断路器
CN203377585U (zh) * 2013-08-28 2014-01-01 德力西电气有限公司 一种剩余电流保护电路
CN204065253U (zh) * 2014-04-30 2014-12-31 西门子公司 漏电保护器及用于该漏电保护器的测试电路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111224419A (zh) * 2020-03-03 2020-06-02 阳光电源股份有限公司 储能逆变器

Similar Documents

Publication Publication Date Title
CN103647458B (zh) 变频系统及给其内的高压变频器进行预充电的方法和装置
KR101320373B1 (ko) 변압기를 구비한 결상복구장치 및 그 설치공법
CN104158282A (zh) 一种双路切换控制电源电路及高压变频器
CN109698615A (zh) 一种双流制独立轴控的牵引变流器
KR20130044247A (ko) 전력계통의 결상 시 결상복구장치 및 그 복구방법
CN204741270U (zh) 变压器中性点直流电流隔离装置
CN105529681A (zh) 低压不接地系统的漏电保护回路及实现方法
CN204515032U (zh) 一种能量回馈单元的测试装置
CN107404110A (zh) 一种非隔离储能三相离网逆变供电系统
CN104348149B (zh) 一种10kV电压互感器一次侧中性点接地控制系统
CN201490917U (zh) 一种抑制高频共模电压的电路
CN208939586U (zh) 一种适用于电动钻机的网电供电系统
CN206533298U (zh) 带有高压熔断器的非pt取电装置
CN102664393B (zh) 短路电流限流装置
CN202524074U (zh) 电流互感器二次开路保护器
CN204947951U (zh) 一种发电机线性电阻与非线性电阻混合灭磁电路
CN104917154A (zh) 有轨电车直流电源的漏电保护装置
CN108202644A (zh) 一种交流牵引变电所同相供电系统
CN203707756U (zh) 有轨电车直流电源的漏电保护装置
CN208890468U (zh) 一种主备电源切换电路
CN102255595A (zh) 抑制变压器直流偏磁的方法
CN205921374U (zh) 一种励磁限流器及励磁限流电路
CN210985671U (zh) 一种Yyn0配电变压器零序阻抗补偿装置
CN205829132U (zh) 一种电力机车的lcu保护电路
CN205882834U (zh) 一种开关站储能供电切换装置

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20171128