CN103151919B - 直流中继电路 - Google Patents
直流中继电路 Download PDFInfo
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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
- 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
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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
- H02M3/1563—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 without using an external clock
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
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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
- 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
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- 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
本申请公开了一种直流中继电路。其中,一种用于将电力从DC电力的漂浮源转换到双直流(DC)输出端的设备包括:可连接到DC电力的漂浮源的正输入端子和负输入端子;以及可连接到双DC输出端的可馈送给逆变器的正输出端子、负输出端子和接地端子。逆变器可以是二级逆变器或者三级逆变器中的任意一个。电荷存储器件可以与正输入端子和负输入端子并联连接,且从所述正输入端子和负输入端子充电。谐振电路还可以被连接在电荷存储器件和双DC输出端之间。谐振电路可以包括与电容器串联连接的电感器。电荷存储器件可以通过切换至负输出端子或者正输出端子中的任意一个来经由谐振电路放电。
Description
技术领域
本公开内容的方面涉及到分布式电力系统,尤其涉及到光伏电力采集系统,并且更具体地涉及到连接在光伏阵列和3相逆变器电路之间的直流中继电路。
背景
在常规光伏电力采集系统中(其被配置为馈送单相或者三相交流(AC)电网),可以首先从太阳能电池板产生双(正和负)直流(DC)电力。由双(正和负)DC电力提供电力的三相逆变器在三相逆变器的输出端生成三相AC电力。照惯例,通过将太阳能电池板串联,可以将足够高的DC电压提供到三相逆变器的输入端。然而,为了增加整体的功率转换效率,逆变器所需的正和负的DC线路的总和可能超过600伏特。
在北美,在安全机构认证规则UL1741下,电压超过600伏特的输入端可能产生问题。避免该安全问题的方法可以包括对升压电路或者变压器隔离电路输入小于600伏特的电压以在内部产生用于逆变器输入端的双DC线路。额外的升压电路或者变压器隔离电路增大了成本和复杂度,尤其是因为额外的电力转换器模块通常需要专用的控制和保护特征。此外,升压电路或者变压器隔离电路还可能产生电磁干扰(EMI),并且可能导致DC电力到三相AC电力转换的整体效率降低。
因此需要具有低压输入的DC中继电路,并且其将是有利的,其不导致DC电力到三相AC电力转换的整体效率明显降低,并且其为AC逆变器提供足够高的DC输入电压以产生所需大小的逆变器的AC输出。
概述
实施方式包括用于将电力从DC电力的漂浮源转换到双直流(DC)输出端的方法。DC电力的漂浮源包括正输入端子和负输入端子。双DC输出端包括正输出端子、负输出端子和接地端子。所述方法包括为并联连接到正输入端子和负输入端子的电荷存储器件充电。该充电可以从DC电力的漂浮源提供。电荷存储器件的放电可以通过以下来执行:首先在谐振电路的前半个周期期间,第一切换负输入端子经由谐振电路放电到负输出端子;以及其次,在谐振电路的后半个周期期间,第二切换正输入端子经由谐振电路放电到正输出端子。在第一切换期间,可以从负输出端子到负输入端子提供负回流路径。在第二切换期间,可以从正输入端子到正输出端子提供正电流路径。在放电期间,可以从负输出端子到负输入端子提供负回流路径。负回流路径仅允许负电流从负输入端子流到负输出电压端子。在放电期间,可以阻止电流从正输出端子流到正输入端子。谐振电路可以包括与电容器串联连接的电感器。可以从正输入端子到正输出端子提供正电流路径。正电流路径仅允许正电流从正输入端子流到正输出电压端子。
其它的实施方式包括用于将电力从DC电力的漂浮源转换到双直流(DC)输出端的设备。所述设备包括可连接到DC电力的漂浮源的正输入端子和负输入端子,可连接到双DC输出端的正输出端子、负输出端子和接地端子。正输出端子、负输出端子和接地端子可以馈送给逆变器。逆变器可以是二级逆变器或者三级逆变器中的任意一个。电荷存储器件可以与正输入端子和负输入端子并联连接。电荷存储器件可以从正输入端子和负输入端子充电。谐振电路还可以被连接在电荷存储器件和双DC输出端之间。谐振电路可以包括与电容器串联连接的电感器。电荷存储器件可以通过切换至负输出端子或者正输出端子中的任意一个来经由谐振电路放电。电荷存储器件可以是电容器或电池。设备可以包括从直流DC电力的漂浮源的正输入端子到正输出端子的正电流路径。正电流路径可以包括负极连接到正输出端子而正极连接到正输入端子的二极管。设备还可以包括从直流DC电力的漂浮源的负输入端子到负输出端子的负回流路径。回流路径可以包括第二二极管,该第二二极管的正极连接到负输出端子而负极连接到负输入端子。
其它的实施方式可以包括用于将电力从DC电力的漂浮源转换到双直流(DC)输出端的设备,所述设备包括可连接到DC电力的漂浮源的正输入端子和负输入端子,可连接到双DC输出端的正输出端子、负输出端子和接地端子。电荷存储器件可以与正输入端子和负输入端子并联连接。电荷存储器件可以从正输入端子和负输入端子充电。谐振电路还可以被连接在电荷存储器件和双DC输出端之间。电荷存储器件可以通过将负输入端子切换到谐振电路来经由谐振电路放电。开关可以被连接到正输入端子和谐振电路之间,其中当开关闭合时,电荷存储器件经由谐振电路放电到负输出端子。开关可以包括负极连接到负输出端子而正极连接到谐振电路的与之集成的二极管。当开关断开时,电荷存储器件可以从正输入端子充电。电荷存储器件可以从正输入端子和负输入端子充电,且通过切换开关来经由谐振电路放电。第二开关连接在负输入端子和谐振电路之间。当第二开关闭合时,电荷存储器件经由谐振电路放电到正输出端子。当第二开关断开时,电荷存储器件可以从正输入端子充电。第二开关可以包括正极连接到负输入端子而负极连接到谐振电路的第二集成二极管。电荷存储器件可以从正输入端子和负输入端子充电,且通过切换第二开关来经由谐振电路放电。所述开关和第二开关可以包括可控硅整流器(SCR)、绝缘栅双极结型晶体管(IGBT)、双极结型晶体管(BJT)、场效应晶体管(FET)、结型场效应晶体管(JFET)、机械操作的单刀双掷开关(SPDT)、SPDT继电器、SPDT振簧继电器、SPDT固态继电器、绝缘栅场效应晶体管(IGFET)、交流二极管(DIAC)或者交流三极管(TRIAC)。
另外的实施方式包括用于将电力从DC电力的漂浮源转换到双直流(DC)输出端的设备,所述设备包括:可连接到DC电力的漂浮源的正输入端子和负输入端子,可连接到双DC输出端的正输出端子、负输出端子和接地端子。电荷存储器件可以与正输入端子和负输入端子并联连接。电荷存储器件可以从正输入端子和负输入端子充电。电荷存储器件通过将负输入端子切换到谐振电路来经由谐振电路放电。谐振电路可以被连接在电荷存储器件和双DC输出端之间。谐振电路可以包括第一绝缘栅双极型晶体管(IGBT)和第一二极管,所述第一IGBT具有第一发射极和附接在正输入端子的第一集电极,所述第一二极管包括第一正极和第一负极。第一负极可以被连接到第一集电极,而第一正极可以被连接到第一发射极。第一基极可以被附接在第一驱动电路。第二IGBT的第二集电极可以附接在第一发射极以提供第三节点。第二发射极可以被连接到负输入端子。第二二极管的第二负极可以连接到第二集电极,而第二正极可以连接到第二发射极。第二基极可以被附接在第二驱动电路。DC输出端可以包括正端子。第二电容器可以被连接在DC输出正端子和电气接地处之间。DC输出端可以包括负端子。第三电容器可以被连接在DC输出负端子和电气接地处之间,而电感器被连接在第三节点和电气接地处之间。
附图简述
某些实施方式作为例子而不是作为限制在附图中被示出,其中相似的引用数字始终指的是相似的元件,在附图中:
图1示出了根据常规技术的光伏电力采集系统。
图2示出了根据在此描述的一个或者多个实施方式的电力采集系统。
图3示出了根据在此描述的一个或者多个实施方式的用于图2中示出的电力采集系统的方法。
详细描述
现在将详细地提及本发明的特征、其实例在附图中示出。以下通过参考附图进行描述的特征是为了解释本发明。
在详细解释本发明的特征之前,将理解到本发明的应用并不局限于在以下描述中阐述的或者在附图中示出的设计细节和组件配置。本发明能够具有其它特征、或者以多种方式被实践或者实现。还将理解到在此使用的措辞和术语是出于描述的目的,且不应当被认为是限制。例如,在此使用的不定冠词“一个(a)”和“一个(an)”,例如在“一个开关”和“一个DC输出端”中,具有“一个或者多个”的意思,例如“一个或者多个开关”和“一个或者多个DC输出端”。
应当注意到,虽然在此的讨论主要涉及到光伏系统,通过非限制性实施例,本发明可以选择性地被配置为使用包括(但不局限于)风力涡轮机;水轮机;燃料电池;存储系统例如电池、超导飞轮和电容器;以及包括匀速和变速柴油机、斯特林发动机、燃气涡轮机和微型涡轮机的机械设备的其它分布式电力系统。
在此使用的术语“开关”指的是以下项中的任意一种:可控硅整流器(SCR)、绝缘栅双极结型晶体管(IGBT)、双极结型晶体管(BJT)、场效应晶体管(FET)、结型场效应晶体管(JFET)、机械操作的单刀双掷开关(SPDT)、SPDT继电器、SPDT振簧继电器、SPDT固态继电器、绝缘栅场效应晶体管(IGFET)、交流二极管(DIAC)以及交流三极管(TRIAC)。
在此使用的术语“正电流”指的是电流从电路中的较高电势点流动到电路中的较低势差点的方向。在此使用的术语“负电流”指的是从负DC输出端回流到负输入端子的流动。
在此使用的术语“零电流切换”(或者“ZCS”)是在开关被调至开或者关之前,通过开关的电流减小到大体为零安培时。
在此使用的术语“电力转换器”适用于DC到DC转换器、AC到DC转换器、DC到AC逆变器、降压转换器、升压转换器、降压-升压转换器、全桥转换器和半桥转换器、或者本领域中已知的任意其它类型的电功率转换/反相。
术语“电网”和“电力网(mains grid)”在此可交换使用,并且指的是由电力公司提供的交流(AC)电力的源和/或从分布式电力系统提供的AC电力的库。
术语“谐振电路的周期”指的是由谐振电路产生的实质上的周期波形的时间段。该时间段等于谐振电路的谐振频率的倒数。
在此使用的术语“低输入电压”指的是小于600伏特或者由安全规则所规定的其它电压的两个端子之间输入的漂浮(不参考地电位)DC电压。
术语“双DC”输入端或者输出端指的是可以参考第三端子,例如地面电势、电气接地处或者可以在一些点连接到电气接地处的交流(AC)电源的中性点的正端子和负端子。
在此使用的术语“二级逆变器”可以指其输出。二级逆变器的AC相输出具有相对于负端子的两个电压电平。负端子对于二级逆变器的AC相输出和直流(DC)输入是共用的。二级逆变器的交流(AC)相输出可以是单相输出、二相输出或者三相输出。因此,单相输出具有相对于负端子的两个电压电平。二相输出中,对于两个相中的每一相,具有相对于负端子的两个电压电平。三相输出中,对于三个相中的每一相,具有相对于负端子的两个电压电平。
类似地,在此使用的术语“三级逆变器”可以指三级逆变器的交流(AC)相输出。AC相输出具有相对于负端子的三个电压电平。负端子对于三级逆变器的AC相输出和直流(DC)输入是共用的。三级逆变器的交流(AC)相输出可以是单相输出、二相输出或者三相输出。因此,单相输出具有相对于负端子的三个电压电平。二相输出中,对于两个相中的每一相,具有相对于负端子的三个电压电平。三相输出中,对于三个相中的每一相,具有相对于负端子的三个电压电平。
因为可以使用更高效的较低电压的设备,与二级逆变器相比,三级逆变器可以具有更干净的AC输出波形、可以使用较小尺寸的磁性组件、并且可以在电力开关具有较低的损耗。三级逆变器电路可以具有双(正和负)直流(DC)输入端。
参考图1,其示出了根据常规技术的光伏电力采集系统10。光伏串109包括串联连接的光伏板101。光伏串109可以一起被并联连接在互连阵列111中,其在DC电力线路X和Y提供并行的直流(DC)电力输出。并行的DC电力输出在DC电力线路X和Y上为直流到交流(DC到AC)三相逆变器103提供电力输入。逆变器103的三相AC电力输出(相W、U和V)跨接AC负载105。实施例的AC负载105可以是三相AC电动机或者三相电网。
现在参考图2,其示出了根据本发明的特性的电力采集系统20。系统20包括互连的光伏阵列111,其可以在正输入端子A和负输入端子B上提供漂浮的直流电压(DC)。漂浮的DC电压还可以从其它分布式电力系统,例如DC电压发生器来提供。跨接到正输入端子A和负输入端子B的是电荷存储器件C1,该电荷存储器件C1可以是电容器。连接到正输入端子A的是绝缘栅双极型晶体管(IGBT)IGBT1的集电极。IGBT1的发射极连接到节点C。IGBT1可以包括正极连接到发射极而负极连接到集电极的与其集成的二极管。连接到负输入端子B的是绝缘栅双极型晶体管(IGBT)IGBT2的发射极。IGBT2的集电极连接到节点C。IGBT2可以包括正极连接到发射极而负极连接到集电极的与其集成的二极管。驱动电路G1和G2被分别连接到IGBT1和IGBT2的基极,并且可以以接地电势作为参考。电感器L1连接在节点C和D之间,其中节点D可以连接到地和逆变器103a的接地输入端。二极管CR1的正极连接到正输入端子A,而负极连接到节点V+。二极管CR1在节点V+和正输入端子A之间提供正电流路径。电容器C2连接在节点D和节点V+之间。节点V+将DC正电压提供到逆变器103a的输入端。二极管CR2的负极连接到负输入端子B,而正极连接到节点V-。二极管CR2在节点V-和节点B之间提供负回流路径。电容器C3连接在节点D和节点V-之间。节点V-将DC负电压提供到逆变器103a的输入端。电容器C2和C3可以具有大致相等的电容值。逆变器103a可以具有来自节点V+、V-和节点D的双DC输入的3级逆变器拓扑结构,该双DC输入可以被转换为单相或者3相AC电压输出,该AC电压输出供给可以是单相或者3相负载的负载105。
现在参考图3,其示出了根据本发明的特性的应用到图2中示出的电力采集系统20的方法301。在步骤303,通过将电容器C1在正输入端子A和负输入端子B直接连接到阵列111的两端,电容器C1可以通过阵列111的漂浮DC电压被充电。
IGBT1和IGBT2可以通过对应的驱动电路G1和G2被交替地选通,以致当IGBT1开启时IGBT2关闭,并且反过来也是一样的。IGBT1和IGBT2可以以小于50%的占空比被交替地选通,以便于避免IGBT1和IGBT2之间的交叉导通(即,避免IGBT1和IGBT2同时被开启)。从阵列111提供的漂浮电压实质上在节点V+提供相对于地的正电压且在节点V-上提供相对于地的负电压。节点V+和节点V-上的电压可以实质上等于漂浮电压的大小。步骤303中,在交替开关IGBT1和IGBT2期间,可以继续充电电容器C1。
当开关IGBT1开启(且IGBT2关闭)时,电流从阵列111流动,而放电电流从存储电容器C1流通过(步骤305a)IGBT1的集电极和发射极,通过电感器L1进入电容器C3和在地(节点D)和节点V-之间的逆变器103a输入负载中。电感器L1和电容器C3形成串联谐振电路。IGBT1两端的二极管相对于正输入端子A的电压被反向偏置。相对于地(节点D)和节点V-的到逆变器103a的输入电压可从电容器C3获取。通过等式1给出电感器L1和电容器C3的谐振频率,在等式2中给出了对应的谐振周期时间T。
fo=1/2π(L1×C3)1/2 等式1
T=1/fo 等式2
当IGBT1初始开启时,通过电感器L1以及通过IGBT1的集电极和发射极的电流可以均为零。在IGBT1初始开启后,通过L1的电流和通过IGBT1的集电极和发射极的电流可以增大并随后正弦曲线般下降。当IGBT1关闭时(开关的开启期间对应于谐振周期时间T的一半),通过电感器L1以及通过IGBT1的集电极和发射极的电流可以接近于零。
节点V-和负输入端子B之间的负电流路径在对应于谐振周期时间T的一半可以通过二极管CR2完成。
通过电容器C1在正输入端子A和负输入端子B直接连接到阵列111两端,电容器C1仍然过阵列111的漂浮DC电压被充电,步骤303继续。当IGBT2开启(且IGBT1关闭)时,电流从阵列111流动,而放电电流从存储电容器C1流过(步骤305b)二极管CR1、通过地(节点D)和节点V+之间的逆变器103a的输入负载、通过C2、通过电感器L1并通过IGBT2的集电极和发射极。电感器L1和电容器C2形成串联谐振电路。跨接于IGBT2的二极管相对于负输入端子B的电压可以被反向偏置。相对于地(节点D)和节点V+的到逆变器103a的输入电压从电容器C2的两端获得。电容器C2可以和电容器C3具有相同的值;因此,电感器L1和电容器C2的谐振频率以及对应的谐振周期时间T可以大体相同。当IGBT2初始开启时,通过电感器L1以及通过IGBT2的集电极和发射极的电流可以均为零,并且在IGBT2开启时功率损耗可以大体为零。在IGBT2初始开启后,通过L1的电流和通过IGBT2的集电极和发射极的电流可以增大并随后正弦曲线般下降。当IGBT2关闭时(开关的开启期间对应于谐振周期时间T的一半),电感器L1中的电流可以接近于零,并且通过IGBT2的集电极和发射极的电流可以接近于零。因此,在IGBT2关闭时功率损耗可以为零。节点V+和正输入端子A之间的正电流路径在对应于谐振周期时间T的一半通过二极管CR1完成。因此可以为开关IGBT1和IGBT2两者的打开和关闭提供零电流切换(ZCS)。
零电流切换(ZCS)可以允许对IGBT1和IGBT2使用和执行较慢的切换速率的晶体管,该晶体管在集电极和发射极之间可以具有较低的电压降。由此,切换损耗和导通损耗均可以减小。类似地,可以使用具有较低电压降的IGBT1和IGBT2的较慢的集成二极管。还可以使用较慢的二极管CR1和CR2。通过IGBT1和IGBT2的集电极和发射极的谐振电流波形还可以减小二极管CR1和CR2中的开启损耗以及产生的电磁干扰(EMI)。
尽管示出和描述了选定的本发明的特征,将理解到本发明并不局限于所描述的特征。反之,将理解到在不偏离本发明的原理和精神下,可以对这些特征进行改变,该范围通过权利要求及其等价物来被限定。
Claims (22)
1.一种用于将电力从直流(DC)电力的漂浮源转换到双直流(DC)输出端的方法,其中所述DC电力的漂浮源包括正输入端子和负输入端子,所述双DC输出端包括正输出端子、负输出端子和接地端子,所述方法包括:
为并联连接到所述正输入端子和所述负输入端子的电荷存储器件充电;以及
通过在切换循环的第一部分期间第一切换所述负输入端子使所述电荷存储器件经由谐振电路放电到所述负输出端子,其中所述切换循环的所述第一部分包括对应于所述谐振电路的谐振周期的一半的第一开启周期,以及通过在所述切换循环的第二部分期间第二切换所述正输入端子使所述电荷存储器件经由所述谐振电路放电到所述正输出端子,其中所述切换循环的所述第二部分包括对应于所述谐振电路的所述谐振周期的另一半的第二开启周期。
2.如权利要求1所述的方法,其中所述充电从所述DC电力的漂浮源来提供。
3.如权利要求1所述的方法,其中所述谐振电路包括与电容器串联连接的电感器。
4.如权利要求1所述的方法,所述方法还包括:
在所述第二切换期间,提供从所述正输入端子到所述正输出端子的正电流路径。
5.如权利要求1所述的方法,还包括:
在所述第一切换期间,提供从所述负输出端子到所述负输入端子的负回流路径。
6.如权利要求5所述的方法,其中所述负回流路径仅允许负电流从所述负输入端子流动到所述负输出端子。
7.如权利要求4所述的方法,还包括:
在所述放电期间,阻止电流从所述正输出端子流到所述正输入端子。
8.如权利要求4所述的方法,还包括:
在所述充电期间,阻止电流从所述正输出端子流到所述负输入端子。
9.如权利要求4所述的方法,其中所述正电流路径仅允许正电流从所述正输入端子流到所述正输出端子。
10.一种用于将电力从DC电力的漂浮源转换到双直流(DC)输出端的设备,所述设备包括:
可连接到所述DC电力的漂浮源的正输入端子和负输入端子;
可连接到所述双DC输出端的正输出端子、负输出端子和接地端子;
并联连接到所述正输入端子和所述负输入端子的电荷存储器件,其中所述电荷存储器件从所述正输入端子和所述负输入端子充电;
连接在所述电荷存储器件和所述双DC输出端之间的谐振电路,其中所述电荷存储器件适于通过切换至所述负输出端子或者所述正输出端子中的任意一个来经由所述谐振电路放电,其中,所述切换至所述负输出端子包括对应于所述谐振电路的谐振周期的一半的第一开启周期,并且其中切换至所述正输出端子包括对应于所述谐振电路的所述谐振周期的另一半的第二开启周期。
11.如权利要求10所述的设备,还包括:
从所述负输入端子到所述负输出端子的负回流路径。
12.如权利要求11所述的设备,其中所述负回流路径包括:
二极管,其包括连接到所述负输出端子的正极和连接到所述负输入端子的负极。
13.如权利要求10所述的设备,还包括:
连接在所述正输入端子和所述谐振电路之间的开关,其中当所述开关闭合时,所述电荷存储器件经由所述谐振电路放电到所述负输出端子,其中当所述开关断开时,所述电荷存储器件从所述正输入端子充电。
14.如权利要求13所述的设备,其中所述电荷存储器件从所述正输入端子和所述负输入端子充电,且通过切换所述开关来经由所述谐振电路放电。
15.如权利要求13所述的设备,其中所述开关包括:
集成二极管,其负极连接到所述正输入端子,且正极连接到所述谐振电路。
16.如权利要求10所述的设备,还包括:
连接在所述负输入端子和所述谐振电路之间的第二开关,其中当所述第二开关闭合时,所述电荷存储器件经由所述谐振电路放电到所述正输出端子,其中当所述第二开关断开时,所述电荷存储器件从所述正输入端子充电。
17.如权利要求16所述的设备,其中所述电荷存储器件从所述正输入端子和负输入端子充电,且通过切换所述第二开关来经由所述谐振电路放电。
18.如权利要求16所述的设备,其中所述第二开关包括:
第二集成二极管,其正极连接到所述负输入端子,且负极连接到所述谐振电路。
19.如权利要求10所述的设备,还包括:
从所述正输入端子到所述正输出端子的正电流路径。
20.如权利要求19所述的设备,其中所述正电流路径包括:
二极管,其负极连接到所述正输出端子,且正极连接到所述正输入端子。
21.如权利要求10所述的设备,其中所述正输出端子、所述负输出端子和所述接地端子馈送入逆变器,其中所述逆变器是二级逆变器和三级逆变器中的一个。
22.如权利要求10所述的设备,其中所述谐振电路包括:
第一绝缘栅双极型晶体管(IGBT),其包括:
第一集电极,其附接在所述正输入端子;
第一发射极;
第一二极管,其包括第一正极和第一负极,所述第一负极连接到所述第一集电极,而所述第一正极连接到所述第一发射极;
第一基极,其附接在第一驱动电路;
第二IGBT,其包括:
第二集电极,其附接到所述第一发射极以提供第三节点;
第二发射极,其连接到所述负输入端子;
第二二极管,其第二负极连接到所述第二集电极,而其第二正极连接到所述第二发射极;
第二基极,其附接到第二驱动电路;
DC输出正端子;
第二电容器,其连接在所述DC输出正端子和电气接地处之间;
DC输出负端子;
第三电容器,其连接在所述DC输出负端子和电气接地处之间;以及
电感器,其连接在所述第三节点和电气接地处之间。
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US8570005B2 (en) | 2013-10-29 |
EP2568562B1 (en) | 2020-06-24 |
US20130063119A1 (en) | 2013-03-14 |
CN103151919A (zh) | 2013-06-12 |
EP2568562A2 (en) | 2013-03-13 |
EP2568562A3 (en) | 2016-09-07 |
US10396662B2 (en) | 2019-08-27 |
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