CN104426165A - 光伏逆变器 - Google Patents

光伏逆变器 Download PDF

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Publication number
CN104426165A
CN104426165A CN201410444252.3A CN201410444252A CN104426165A CN 104426165 A CN104426165 A CN 104426165A CN 201410444252 A CN201410444252 A CN 201410444252A CN 104426165 A CN104426165 A CN 104426165A
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photovoltaic
voltage
capacitor
converter
parallel
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朴泰范
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LS Electric Co Ltd
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LS Industrial Systems Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30Electrical components
    • H02S40/32Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10Parallel operation of dc sources
    • H02J1/102Parallel operation of dc sources being switching converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0067Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/22The renewable source being solar energy
    • H02J2300/24The renewable source being solar energy of photovoltaic origin
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

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

Abstract

本发明涉及光伏逆变器,其能够将多个光伏模块通过单个升压器连接到多支路光伏逆变器的各输入端口。在此公开的光伏逆变器包括:多个输入部分,分别串联连接到多个光伏模块;多个电抗器,分别串联连接到多个输入部分;第一电容器,被配置为分别充入通过所述多个输入部分所输送的所述多个光伏模块的DC电压;第一电阻器,并联连接到所述第一电容器;升压器单元,并联连接到互相并联连接的第一电容器和第一电阻器,并且被设置为升高充入所述第一电容器的电压;和逆变器单元,被设置为将通过所述升压器单元升高的电压转换为AC电压来供给电网。

Description

光伏逆变器
技术领域
本发明涉及一种光伏逆变器,更具体地涉及这样一种光伏逆变器:其能够将多个光伏模块通过单个升压器连接到多支路(multi-string)光伏逆变器的输入端口。
背景技术
通常,光伏逆变器(或并网逆变器)是电力转换系统,即这样一种系统:输入光伏电力网和商用电力网通过该系统而互相连接以输送输入光伏电力网的电力到商用电力网。
该光伏逆变器的拓扑可以包括多支路方法。
多支路方法指的是从2个(或复数个)光伏模块接收光伏电力输入的方法。多支路方法可以与传统的从单个光伏模块接收输入的方法相区别。在多支路型的光伏逆变器中,将2个或更多个光伏模块连接到光伏逆变器比将单个光伏模块连接到光伏逆变器更有效率。
但是,根据现有技术的多支路型光伏逆变器当连接多个光伏模块到单个光伏逆变器时,应该根据光伏模块的数量而具有用于每个输入端口的升压器。这可能导致产品的制造成本上升。
(专利文件1)韩国专利申请号10-2011-0070481
发明内容
因此,本公开的一个方案提供了一种光伏逆变器,其能够将多个光伏模块通过单个升压器连接到多支路型光伏逆变器,而不必使用用于光伏逆变器的每个输入端口的升压器。
为了实现该目的和其他有益效果以及根据本公开的目的,如在此具体化的和宽泛说明的,提供了一种光伏逆变器,其包括:
多个输入部分,其分别串联连接到多个光伏模块;
多个电抗器,其分别串联连接到所述多个输入部分;
第一电容器,其被配置为分别存储通过所述多个输入部分所输送的所述多个光伏模块的DC电压;
第一电阻器,其并联连接到所述第一电容器;
升压器单元,其并联连接到互相并联连接的所述第一电容器和第一电阻器,并且被配置为升高充入所述第一电容器的电压;和
逆变器单元,其被配置为将通过所述升压器单元升高的电压转换为AC电压来供给电网。
根据本公开的一个方案,所述第一电容器被配置为充入(也叫做“存储”)所述多个光伏模块的DC电压的平均值电压。
根据本公开的另一个方案,所述第一电阻器被配置为消耗充入所述第一电容器的电压。
本发明的进一步的可应用范围可以通过后文的具体实施方式变得更加清楚。但是,由于在本公开的宗旨和思想内的各种变形和改进通过具体说明对本领域技术人员是显而易见的,应理解的是,详细说明和具体示例在表示本发明优选实施例的同时仅以例证的方式给出。
附图说明
被包括以进一步理解本公开并被结合到本公开和作为本公开的一部分的附图说明了示例实施例并与说明书一起用于说明本公开的原理。
图1是根据本发明的优选实施例的光伏逆变器的结构的框图。
图2是根据本发明的实施例的光伏逆变器的电路图。
具体实施方式
以下将参照附图对示例性实施例进行详细说明。为了简明扼要的参照附图进行说明,同样的或等同的部件会使用同样的附图标记,并且不重复说明。
图1是根据本发明的优选实施例的光伏逆变器10的结构框图。
如图1所示,光伏逆变器10可以包括输入单元100,电抗器200,第一电容器300,第一电阻器400,升压器单元500和逆变器单元600。但是,应该理解为,实施如图1的光伏逆变器10的图示的各部件均不是必需的。可以选择更多的或更少的部件来实施。
输入单元100,如图2所示,可以包括多个输入部分,例如,第一输入部分110,第二输入部分120,……,和第N输入部分1N0。
另外,该输入单元100包括的多个输入部分可以分别与多个光伏模块串联连接。
例如,第一输入部分110可以接收从与其串联连接的第一光伏模块1输送的第一DC电压(或电力/电流/电能),第二输入部分(未图示)可以接收从与其串联连接的第二光伏模块输送的第二DC电压。这里,第一DC电压和第二DC电压可以有同样的或不同的值。
电抗器200可以被设置为与输入单元100里包括的输入部分的数量一样多。
也就是,电抗器200可以包括多个电抗器,例如,第一电抗器210,第二电抗器(未示出),……,和第N电抗器2N0。
另外,电抗器200可以并联连接到输入单元100。
第一电容器300可以串联连接到电抗器200(或输入单元100)。
第一电容器300可以存储(也叫做“充入”)多个光伏模块(1-N)的通过输入单元100被输送的DC电压(也叫做DC功率或DC电流或DC电力)。这里,第一电容器300可以充入(也叫做“存储”)多个光伏模块(1-N)的DC电压的平均值电压。
例如,第一电容器300可以存储从第一光伏模块1通过第一输入部分110所输送的(也叫做被输出的)第一DC电压的平均值电压,和从第二光伏模块通过第二输入部分所输送的(也叫做被输出的)第二DC电压的平均值电压。
第一电阻器400可以并联连接到电抗器200和第一电容器300。
另外,第一电阻器400可以消耗第一电容器300中所充的电压。
也就是,由于少量电流流经第一电阻器400,第一电阻器400可以用来便于多个DC电压的平均值电压被充入第一电容器300。
升压器单元500可以并联连接到互相并联连接的第一电容器300和第一电阻器400。
升压器单元500,如图2所示,可以包括开关510,二极管520和第二电容530。
升压器单元500还可以升高(也叫做升压或增加)第一电容器300里充入的电压。
逆变器单元600可以将经过升压器单元500升压的电压(也叫做电能或经稳压的DC电力)转换为AC电压(也叫做AC电能或AC电力或3相AC电力),以供给(也叫做“输出”)至电网,如感应电动机(未说明)。
也就是,变换单元600可以通过输入单元100而从多个光伏模块中的每个接收DC电压(也叫做DC电能),转换相应的DC电压为AC电压(也叫做AC电能),并提供经转换的AC电压给电力网。
如前所述在此公开的示例性实施例说明了多个光伏模块通过单个升压器进行连接,不需要使用用于多支路光伏逆变器的每个输入端口的升压器。这可导致制造成本和光伏模块体积的减少。
前述的实施例和优点仅仅是示意性的,并且不应解释为对本公开的限制。本教导能够容易的实施到其他类型的装置。本说明书旨在是说明性的,而不在于限制权利要求的范围。许多替代方式,修改和变形对于本领域的技术人员将是显而易见的。在此说明的示例性实施例的这些特征、结构、方法和其他特征可以以各种方式被接合来获得另外的和/或可选的示例性实施例。
因为这些特征可以体现在数个形式中而不偏离其特性,所以还应该理解到,前述的实施例不被前面说明的任何细节限制,除非具体说明,而是应当在随附的权利要求中定义的范围里被宽泛地解释,并且因而落入权利要求的界限和范围里的修改或改变或该界限和范围里的等同方案全部旨在由随附的权利要求所包括。

Claims (3)

1.一种光伏逆变器,其特征在于,所述光伏逆变器包括:
多个输入部分,其分别串联连接到多个光伏模块;
多个电抗器,其分别串联连接到所述多个输入部分;
第一电容器,其被配置为分别存储通过所述多个输入部分所输送的所述多个光伏模块的DC电压;
第一电阻器,其并联连接到所述第一电容器;
升压器单元,其并联连接到互相并联连接的所述第一电容器和第一电阻器,并且被配置为升高充入所述第一电容器的电压;和
逆变器单元,其被配置为将通过所述升压器单元升高的电压转换为AC电压来供给电网。
2.根据权利要求1所述的光伏逆变器,其中所述第一电容器被配置为充入所述多个光伏模块的DC电压的平均值电压。
3.根据权利要求1所述的光伏逆变器,其中所述第一电阻器被配置为消耗充入所述第一电容器的电压。
CN201410444252.3A 2013-09-02 2014-09-02 光伏逆变器 Pending CN104426165A (zh)

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CN107810595A (zh) * 2015-06-30 2018-03-16 皇家飞利浦有限公司 控制多输入多输出转换器
CN107810595B (zh) * 2015-06-30 2021-02-09 皇家飞利浦有限公司 控制多输入多输出转换器

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