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CN206250778U - 一种光伏逆变系统 - Google Patents

一种光伏逆变系统 Download PDF

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Publication number
CN206250778U
CN206250778U CN201621186509.0U CN201621186509U CN206250778U CN 206250778 U CN206250778 U CN 206250778U CN 201621186509 U CN201621186509 U CN 201621186509U CN 206250778 U CN206250778 U CN 206250778U
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inverting system
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赵为
梅晓东
张显立
陈威
申潭
李顺
陆游
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Priority to CN201621186509.0U priority Critical patent/CN206250778U/zh
Priority to CA2965113A priority patent/CA2965113A1/en
Priority to US15/499,080 priority patent/US20180131193A1/en
Priority to EP17168658.7A priority patent/EP3319195A1/en
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    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
    • H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
    • 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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
    • 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
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
    • 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
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • 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
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Photovoltaic Devices (AREA)

Abstract

本实用新型提供一种光伏逆变系统，其中的多台独立的逆变单元集中设置于壳体内；每台独立的逆变单元具有独立的MPPT功能，使得所述光伏逆变系统具有多路MPPT控制，在山丘等复杂场景下，面对部分遮挡及朝向不一致的现象，能够实现光伏组串的最大功率发电，保证系统发电量。同时由于独立的逆变单元集中放置在壳体内，方便现场安装运维。

Description

一种光伏逆变系统
技术领域
本实用新型涉及光伏逆变技术领域，特别涉及一种光伏逆变系统。
背景技术
当前，光伏逆变系统中的集中式逆变方案，参见图1，包括：多路直流汇流装置、一个箱式逆变器(或者逆变器房、集装箱)以及一个箱式变压器。
电池板组串输出后，就近接入直流汇流装置，直流汇流装置通过走线将直流组串汇总到箱式逆变器，由箱式逆变器的输出端直接通过箱式变压器并网。
但是该方案下，逆变系统的MPPT(Maximum Power Point Tracking，最大功率点跟踪)控制数量少，在山丘等复杂场景下，面对部分遮挡及朝向不一致的现象，导致发电量降低。
实用新型内容
本实用新型提供一种光伏逆变系统，以解决现有技术中MPPT控制数量少的问题。
为实现上述目的，本申请提供的技术方案如下：
一种光伏逆变系统，包括：变压器、交流汇流装置、通讯设备、多台独立的逆变单元及多路直流汇流装置；其中：
所述多路直流汇流装置的输入端分别与多路光伏组串一一对应相连；
所述多台独立的逆变单元集中设置于壳体内；
所述多台独立的逆变单元的输入端分别与所述多路直流汇流装置的输出端一一对应相连；
所述多台独立的逆变单元的输出端均与所述交流汇流装置的输入端相连；
所述交流汇流装置的输出端与所述变压器的低压侧相连；
所述通讯设备的一端为所述光伏逆变系统的通讯端，另一端与所述多台独立的逆变单元的控制端相连。
优选的，所述壳体为：包裹所述多台独立的逆变单元的箱式外壳、房或者集装箱。
优选的，所述壳体为一体式平台；所述一体式平台包括：
设置有所述多台独立的逆变单元的底座；
或者设置有所述多台独立的逆变单元的底座，及设置于所述多台独立的逆变单元上方的上盖。
优选的，所述通讯设备包括：单元控制器及交换机；其中：
所述单元控制器的一端与所述多台独立的逆变单元的控制端相连；
所述单元控制器的另一端与所述交换机的一端相连；
所述交换机的另一端为所述光伏逆变系统的通讯端。
优选的，所述多台独立的逆变单元均为：DC/AC变换器。
优选的，所述多台独立的逆变单元中至少一台逆变单元还包括：DC/DC变换器；所述DC/DC变换器的输出端与所述DC/AC变换器的输入端相连。
优选的，所述多台独立的逆变单元均为：组串式逆变器。
优选的，还包括：设置于所述壳体内的风道及烟雾传感器。
优选的，所述交流汇流装置与所述通讯设备均设置于所述壳体内。
优选的，所述光伏逆变系统的通讯端通过光纤与电站后台相连。
本实用新型提供的所述光伏逆变系统，其中的多台独立的逆变单元集中设置于壳体内；每台独立的逆变单元具有独立的MPPT功能，使得所述光伏逆变系统具有多路MPPT控制，在山丘等复杂场景下，面对部分遮挡及朝向不一致的现象，能够实现光伏组串的最大功率发电，保证系统发电量。
附图说明
为了更清楚地说明本实用新型实施例或现有技术内的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述内的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术提供的集中式光伏逆变系统的结构图；
图2是本实用新型实施例提供的光伏逆变系统的结构示意图；
图3是本实用新型另一实施例提供的光伏逆变系统的结构图；
图4是本实用新型另一实施例提供的光伏逆变系统的另一结构图；
图5是现有技术提供的集散式光伏逆变系统的结构图；
图6是本实用新型另一实施例提供的壳体内部的布局示意图。
具体实施方式
为使本实用新型的上述目的、特征和优点能够更加明显易懂，下面结合附图对本实用新型的具体实施方式做详细的说明。
本实用新型提供一种光伏逆变系统，以解决现有技术中MPPT控制数量少的问题。
具体的，所述光伏逆变系统，参见图2，包括：变压器101、交流汇流装置102、通讯设备103、多台独立的逆变单元104及多路直流汇流装置105；其中：
多路直流汇流装置105的输入端分别与多路光伏组串一一对应相连；
参见图3，多台独立的逆变单元104集中设置于壳体100内；
多台独立的逆变单元104的输入端分别与多路直流汇流装置105的输出端一一对应相连；
多台独立的逆变单元104的输出端均与交流汇流装置102的输入端相连；
交流汇流装置102的输出端与变压器101的低压侧相连；
通讯设备103的一端为所述光伏逆变系统的通讯端，另一端与多台独立的逆变单元104的控制端相连。
在具体的实际应用中，通讯设备103可以以通讯柜的形式设置于壳体100附近，交流汇流装置102也可以设置于壳体100外侧，此处不做具体限定，仅为一种示例，均在本申请的保护范围内。
具体的工作原理为：
各个光伏组串的输出经过各自直流汇流装置105汇流，然后通过两根直流电(+/-)传输到壳体100内。
壳体100内对外设置有直流接口，即多台独立的逆变单元104各自的输入端，分别与直流汇流装置105的输出端一一对应相连；
多台独立的逆变单元104分别在各自的MPPT控制下进行逆变，然后通过交流汇流装置102进行汇流，输出至变压器101(比如箱式变压器)的低压侧。
通讯设备103的一端为所述光伏逆变系统的通讯端，与电站后台相连。
在具体的实际应用中，以1MW系统为例，一个独立的逆变单元104的功率为50KW，一个独立的逆变单元104包括三个MPPT，则1MW系统具有的MPPT数量为20×3＝60个MPPT，能较好的应用在山丘电站等复杂场景。
因此，本实施例提供的所述光伏逆变系统，具有多路MPPT控制，在山丘等复杂场景下，面对部分遮挡及朝向不一致的现象，能够实现各个光伏组串的最大功率发电，保证系统发电量。
另外，将各个独立的逆变单元104统一放置在壳体100内部，在壳体100内部进行预装后，对外通过直流接口，与直流汇流装置105对接，不仅整体系统简单，能够实现现场快速接入；同时，壳体100内核心设备集中放置，方便统一管理运维；在具体的应用中，独立的逆变单元104重量为50Kg左右，可做到无需专业人员的情况下快速更换。相比现有技术中另外存在的组串式逆变方案、各个独立的逆变单元分散在电站阵列中间，特别是在山丘电站，本实施例所述的光伏逆变系统，运维及时性大大提高，难度大大减小。
值得说明的是，现有技术中的光伏逆变系统，还存在图5所示的集散式逆变方案，电池板组串输出后，就近接入DC/DC智能汇流箱，DC/DC智能汇流箱通过走线将直流组串汇总到箱式逆变器，由箱式逆变器的输出端直接通过箱式变压器并网。DC/DC智能汇流箱虽然具有MPPT功能，但是由于DC/DC智能汇流箱通过很长的传输线与后端箱式逆变器连接，而DC/DC智能汇流箱输出的高频直流电压，经过长时间传输后，传输线存在较大的对地寄生电容，导致系统存在较大的高频漏电流，进而降低了系统效率及可靠性，现场出现大量的DC/DC智能汇流箱损坏的情况。同时，DC/DC汇流箱与箱式逆变器之间没有快速协调机制，仅仅通过通讯线来协调系统的工作，系统的响应速度跟不上，容易出现故障，如交流电网低电压穿越时，DC/DC汇流箱由于通讯延时滞后动作，导致直流母线电压迅速抬升导致故障，目前很难通过低电压穿越等电网强制试验，成为限制集散式逆变器发展的重要原因。
而本实施例所述的光伏逆变系统，参见图3，通讯设备103可以以通讯柜的形式设置于壳体100附近，通过通讯设备103与各独立的逆变单元104在短距离内高速通讯，能快速响应电网的有功及无功调度，特别是后期充分发挥其无功能力，使其在大型电站中能够具备替代SVG的能力。
综上，本实施例所述的光伏逆变系统，通过将独立的逆变单元104集中预装在壳体100内部，通过通讯设备103与各独立的逆变单元104高速通讯，实现了多路MPPT控制、集中管理、统一接入箱式变压器101及运维简单便捷的多优势结合。
在具体的实际应用中，壳体100可以为一体式平台；所述一体式平台包括：
设置有多台独立的逆变单元104的底座；
或者设置有多台独立的逆变单元104的底座，及设置于多台独立的逆变单元104上方的上盖。
或者，壳体100为图3所示的：包裹多台独立的逆变单元104的箱式外壳、房或者集装箱。
当壳体100为图3所示的包裹多台独立的逆变单元104的箱式逆变器外壳、逆变器房或者集装箱时，优选的，所述光伏逆变系统还包括：设置于壳体100内的风道及烟雾传感器。
整个壳体100及其内部结构，根据安装场景需求，此处不做具体限定，均在本申请的保护范围内。
当壳体100为一体式平台时，其内部的逆变单元104可以选择防护等级稍高的器件；而当壳体100图3所示的包裹多台独立的逆变单元104的箱式逆变器外壳、逆变器房或者集装箱时，由于箱式逆变器外壳、逆变器房或者集装箱本身具有一定的防护等级(比如IP54)，因此，各独立的逆变单元104的防护等级可以是IP65(比如目前通用的组串式逆变器)，也可以更低，如IP21(升压单元与独立的逆变单元够成的功率单元或纯独立的逆变单元)。
因此，本实用新型另一实施例还提供了另外一种光伏逆变系统，图2中独立的逆变单元104可以为：DC/AC变换器，或者，多台逆变单元104中至少一台逆变单元还包括：DC/DC变换器；所述DC/DC变换器的输出端与所述DC/AC变换器的输入端相连。
再或者，独立的逆变单元104为：组串式逆变器。
多个具有MPPT功能的独立的逆变单元集中放置在一起(集装箱或其他)，形成多路MPPT控制。
另外，参见图2，通讯设备103包括：单元控制器301及交换机302；
单元控制器301的一端与多台独立的逆变单元104的控制端相连；
单元控制器301的另一端与交换机302的一端相连；
交换机302的另一端为所述光伏逆变系统的通讯端。
单元控制器301负责管理壳体100内各个独立的逆变单元104，与各个独立的逆变单元104高速通讯，使系统能够快速响应电网的有功及无功调度。
本实施例给出了逆变单元104与通讯设备103的具体实现形式，但是仅为一种示例，并不一定限定于此，可以视其具体的应用环境而定，均在本申请的保护范围内。
本实用新型另一实施例还提供了另外一种光伏逆变系统，在图2的基础之上，优选的，参见图4，交流汇流装置102与通讯设备103均设置于壳体100内，使得壳体100对外设置有：
输入端，作为壳体100的直流接口，与直流汇流装置105的输出端相连；
输出端，作为壳体100的交流接口，与变压器101的低压侧相连；
通讯端，作为壳体100的通讯接口，与电站后台相连。
壳体100的对外接口少，对内将各个独立的逆变单元104进行交流预装后，对外通过交流接口，与变压器101的低压侧对接，不仅整体系统简单，能够实现现场快速接入；同时，壳体100内核心设备集中放置，方便统一管理运维，可做到无需专业人员的情况下快速更换，运维及时。
优选的，壳体100的通讯端通过光纤与电站后台相连。
光纤连接可以保证高速通讯的实现，利于所述光伏逆变系统的应用。
在具体的实际应用中，壳体100内部的各独立的逆变单元104的布局方式，可以根据需要进行灵活处理，比如壁挂、平躺安装，或者也可以根据需要层叠安装。图6是一种壳体100内部独立的逆变单元104的布局方式，此处不做具体限定，均在本申请的保护范围内。
具体的工作原理与上述实施例相同，此处不再一一赘述。
本实用新型中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对于实施例公开的装置而言，由于其与实施例公开的方法相对应，所以描述的比较简单，相关之处参见方法部分说明即可。
以上所述，仅是本实用新型的较佳实施例而已，并非对本实用新型作任何形式上的限制。虽然本实用新型已以较佳实施例揭露如上，然而并非用以限定本实用新型。任何熟悉本领域的技术人员，在不脱离本实用新型技术方案范围情况下，都可利用上述揭示的方法和技术内容对本实用新型技术方案做出许多可能的变动和修饰，或修改为等同变化的等效实施例。因此，凡是未脱离本实用新型技术方案的内容，依据本实用新型的技术实质对以上实施例所做的任何简单修改、等同变化及修饰，均仍属于本实用新型技术方案保护的范围内。

Claims (10)

1.一种光伏逆变系统，其特征在于，包括：变压器、交流汇流装置、通讯设备、多台独立的逆变单元及多路直流汇流装置；其中：
所述多路直流汇流装置的输入端分别与多路光伏组串一一对应相连；
所述多台独立的逆变单元集中设置于壳体内；
所述多台独立的逆变单元的输入端分别与所述多路直流汇流装置的输出端一一对应相连；
所述多台独立的逆变单元的输出端均与所述交流汇流装置的输入端相连；
所述交流汇流装置的输出端与所述变压器的低压侧相连；
所述通讯设备的一端为所述光伏逆变系统的通讯端，另一端与所述多台独立的逆变单元的控制端相连。
2.根据权利要求1所述的光伏逆变系统，其特征在于，所述壳体为：包裹所述多台独立的逆变单元的箱式外壳、房或者集装箱。
3.根据权利要求1所述的光伏逆变系统，其特征在于，所述壳体为一体式平台；所述一体式平台包括：
设置有所述多台独立的逆变单元的底座；
或者设置有所述多台独立的逆变单元的底座，及设置于所述多台独立的逆变单元上方的上盖。
4.根据权利要求1所述的光伏逆变系统，其特征在于，所述通讯设备包括：单元控制器及交换机；其中：
所述单元控制器的一端与所述多台独立的逆变单元的控制端相连；
所述单元控制器的另一端与所述交换机的一端相连；
所述交换机的另一端为所述光伏逆变系统的通讯端。
5.根据权利要求1所述的光伏逆变系统，其特征在于，所述多台独立的逆变单元均为：DC/AC变换器。
6.根据权利要求5所述的光伏逆变系统，其特征在于，所述多台独立的逆变单元中至少一台逆变单元还包括：DC/DC变换器；所述DC/DC变换器的输出端与所述DC/AC变换器的输入端相连。
7.根据权利要求1所述的光伏逆变系统，其特征在于，所述多台独立的逆变单元均为：组串式逆变器。
8.根据权利要求2所述的光伏逆变系统，其特征在于，还包括：设置于所述壳体内的风道及烟雾传感器。
9.根据权利要求1至8任一所述的光伏逆变系统，其特征在于，所述交流汇流装置与所述通讯设备均设置于所述壳体内。
10.根据权利要求1至8任一所述的光伏逆变系统，其特征在于，所述光伏逆变系统的通讯端通过光纤与电站后台相连。
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