CN101847939A - 用于控制单相dc/ac转换器的方法和转换器装置 - Google Patents

用于控制单相dc/ac转换器的方法和转换器装置 Download PDF

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CN101847939A
CN101847939A CN201010141935A CN201010141935A CN101847939A CN 101847939 A CN101847939 A CN 101847939A CN 201010141935 A CN201010141935 A CN 201010141935A CN 201010141935 A CN201010141935 A CN 201010141935A CN 101847939 A CN101847939 A CN 101847939A
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CN101847939B (zh
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安东尼奥·科恰
弗朗西斯科·卡纳莱斯
莱昂纳多-奥古斯托·塞尔帕
米科·帕基宁
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ABB Schweiz AG
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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
    • 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
    • H02M7/4807—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 having a high frequency intermediate AC stage
    • 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
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • 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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/49—Combination of the output voltage waveforms of a plurality of converters
    • 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
    • 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

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

Abstract

本发明公开了一种用于控制单相DC/AC转换器的方法和转换器装置，其中所述转换器装置包括：至少两个单相DC/AC转换器(11，12，1N)；控制装置(60)，配置为控制至少两个单相DC/AC转换器；以及隔离变压器(T)，其中所述至少两个单相DC/AC转换器(11，12，1N)的输出与彼此以及与隔离变压器(T)的输入级联连接，并且控制装置(60)配置为控制至少两个单相DC/AC转换器(11，12，1N)，以轮流将电力从它们的输入传递到它们的输出。

Description

用于控制单相DC/AC转换器的方法和转换器装置
技术领域
本发明涉及控制单相DC/AC转换器和转换器装置。
背景技术
隔离转换器可以用于在转换器的输入和输出之间提供电流隔离。例如，在由光电板产生的DC电压被转换为AC电压并被给送到AC供电网络的光电(PV)应用中，这种电流隔离可能是必须的。非隔离转换器的使用会引起由于光电模块的寄生电容导致的漏电流，这可能引起特别是在薄膜光电模块中的劣化。此外，缺少隔离会危害设备的安全。实际上，某些国家的国家规定要求光电板和AC供电网络之间的电流隔离。
电流隔离可以通过使用与转换器连接的隔离变压器来实现。低频变压器通常庞大并且笨重，因此将优选地使用高频变压器，以便使得系统更加紧凑并且潜在地更便宜。转换器中高频变压器的使用要求为变压器供电的转换器的开关频率也较高。换言之，一般慢的开关速度要求较大的部件值，而较快的开关速度使得能够在转换器中使用更小更便宜的无源部件(例如，变压器、电感器和电容器)。
然而，尽管较高的开关频率将是所期望的，但是开关部件(诸如IGBT(绝缘栅双极型晶体管)和FET(场效应晶体管))的特性会给可以使用的开关频率设置限制。当开关频率增加时，开关损耗通常也增加。结果，转换器的开关频率的增加可能是不可行的或者甚至不可能超过特定限值。
发明内容
因此，本发明的目的是提供一种方法以及用于实现该方法的设备，以便解决或者至少缓解以上问题。使用其特征在于独立权利要求中所声明内容的装置、方法和计算机程序产品实现本发明的目的。在从属权利要求中描述了本发明的优选实施例。
本发明基于如下思想：将两个或者更多个单相DC/AC转换器的输出与彼此以及与隔离变压器的输入级联，并且控制单相DC/AC转换器，以轮流将电力从它们的输入传递到它们的输出，即，使得单相DC/AC转换器按照连续的次序一个接一个地将电力传递到变压器。
本发明的优点在于隔离变压器的等效频率被增加到在单相DC/AC转换器中使用的开关频率的多倍。换言之，可以在不增加单独DC/AC转换器中使用的开关频率的情况下，增加变压器中的频率。所得到的频率的增加使得能够减小变压器和其它这种无源部件的大小，因此，也降低了它们的成本。另外，可以减小并且有效改进整体转换器的体积。本发明可以与利用DC/AC转换器和隔离变压器的任何应用结合使用。
附图说明
在下文中，将参照附图，结合优选实施例更详细地描述本发明，其中
图1示出根据本发明实施例的框图；
图2示出根据本发明实施例的电路图；
图3示出根据本发明实施例的框图；
图4示出根据本发明实施例的框图；
图5示出根据本发明实施例的电路图；
图6示出根据本发明实施例的转换器控制脉冲的图；
图7示出根据本发明实施例的转换器开关控制脉冲的图；
图8示出根据本发明实施例的电压和电流图；以及
图9示出根据本发明实施例的电压和电流图。
具体实施方式
本发明的应用不限于任何特定系统，而是可以与各种电气系统结合使用。另外，本发明的使用不限于采用任何特定基频或者任何特定电压水平的系统。根据本发明实施例，两个或者更多个单相DC/AC转换器的输出与彼此以及与隔离变压器的输入级联连接。图1示出根据某些可能实施例的转换器装置的简化框图。该图仅示出了对理解本发明必要的部件。图1的示例性装置示出了三个连接的DC/AC转换器11、12和1N。DC/AC转换器11、12和1N的输出与彼此以及与隔离变压器T的输入10级联，即串联连接。如图1中的示例所示，隔离变压器T可以进一步例如经由AC/AC转换器(即，在该示例中，通过具有DC链电容器C2的DC链连接在一起的AC/DC转换器30和DC/AC转换器40的组合)连接到AC网络50。尽管在该图中仅示出了两相连接，但是这种到AC网络50的连接可以是两相或者三相连接。到单相DC/AC转换器11、12和1N的供电可来自任何适当的电源。在图1的示例性装置中，每个单相DC/AC转换器通过一个或更多个光电池PV1、PV2和PV3供电。光电池PV1、PV2和PV3优选地经由DC/DC转换器21、22和2N连接到单相DC/AC转换器11、12和1N，其中DC/DC转换器21、22和2N通过具有DC链电容器C11、C12和C1N的DC链连接到单相DC/AC转换器。此外，优选地在光电池PV1、PV2和PV3与DC/DC转换器21、22和2N之间使用输入滤波器FI1、FI2和FIN。
根据本发明的实施例，单相DC/AC转换器11、12和1N被控制成轮流将电力从它们的输入传递到它们的输出。DC/AC转换器11、12和1N的控制可由适当的控制装置60(诸如一个或更多个控制单元或器件)来实现。根据一个可能的实施例，至少两个单相DC/AC转换器11、12和1N中的每个被控制成在传递周期(delivery period)将电力从其输入传递到其输出，使得至少两个单相DC/AC转换器中的每个在预定开关周期期间具有一个传递周期，其中，当至少两个单相DC/AC转换器的数量是N时，一个这种传递周期的长度是预定开关周期的100％/2N，并且两个不同的单相DC/AC转换器的两个连续传递周期的起始时间间隔预定开关周期的100％/N。换言之，在给定的开关周期期间，至少两个单相DC/AC转换器中的每个在被轮到时在这样一个周期将电力从其输入传递到其输出：该周期的长度是开关周期的100％/2N，并且具有连续次序的不同单相DC/AC转换器的这种周期的起始时间间隔预定开关周期的100％/N。以上实施例具有这样的优点：即至少两个单相DC/AC转换器中的每个具有相等的占空比。然而，也可能单相DC/AC转换器11、12和1N具有不相等的占空比，例如，使得一个转换器在预定开关周期期间具有两个传递周期，而其它的仅具有一个传递周期。
图6例示了示出在包括两个单相DC/AC转换器11、12、1N的装置中的转换器控制脉冲的图。第一转换器的控制脉冲以粗线绘制，而第二转换器的控制脉冲以虚线绘制。根据上述实施例，当预定开关周期具有长度t1时，第一和第二转换器在开关周期t1期间均具有一个传递周期，使得传递周期t3的长度是开关周期的100％/2N，即，由于N＝2，所以为1/4＊t1。另外，传递周期间隔周期t2，周期t2是预定开关周期的100％/N，即，如所示那样为1/2＊t1。由于两个级联连接的转换器的这种交织调制，因此通过转换器的输出极并因而通过隔离变压器T的电流与其电压相比时具有N倍的频率(即当N＝2时为两倍)。例如，当在两个级联的转换器情况下的转换器均在15kHz运行时，所得到的隔离变压器T内的等效频率(equivalent frequency)是30kHz。以相似方式，在三个级联转换器的情况下，每个转换器均在15kHz的频率运行，所得到的隔离变压器T内的等效频率将是45kHz。然而，应注意的是，本发明不限于任何特定的频率，但是级联的转换器的运行频率取决于使用的特定构造。
图2示出根据本发明实施例的电路图。该电路图示出可如何实现图1的装置的示例。单相DC/AC转换器11、12和1N可被实现为半桥逆变器，每个半桥逆变器分别包括一对可控开关S11和S21、S12和S22以及S1N和S2N。开关可以是例如晶闸管或者晶体管(诸如IGBT或者FET)。开关优选地具有分别与开关S11、S21、S12、S22和S1N反并联连接的、所谓的无功反馈二极管D11、D21、D12、D22、D1N和D2N。因此该构造中的每个单相DC/AC转换器的输出极通过该转换器的负DC极和该转换器的两个可控开关的连接点形成。至少两个单相DC/AC转换器11、12和1N的控制可以通过控制各开关来执行。到开关S11、S21、S12、S22和S1N的控制信号优选地来自控制装置60。为了清楚起见，图2中没有示出控制装置60和开关之间的连接。当单相DC/AC转换器11、12和1N中的每个包括连接到转换器的正DC极的第一开关S11、S12、S1N以及连接到转换器的负DC极的第二开关S21、S22、S2N时，根据实施例，通过控制至少两个单相DC/AC转换器11、12和1N中每个的第一开关S11、S12、S1N在其所属的DC/AC转换器的传递周期导通，并且通过控制至少两个单相DC/AC转换器中每个的第二开关S21、S22、S2N在同一DC/AC转换器的第一开关S11、S12、S1N不导通时导通，执行开关控制。换言之，例如，当例如转换器11具有其传递周期时，通过向开关S11的控制输入(即，在IGBT或者FET的情况下为栅极)施加适当的控制脉冲来控制开关S11导通。在转换器11的传递周期之外，通过向开关S21的控制输入施加适当的控制脉冲来控制开关S21导通。因此，每个转换器11、12和1N的第二开关S21、S22、S2N相对于同一转换器的第一开关S11、S12、S1N互补整流。这在图7中被示出，图7以粗线示出了施加到第一开关的控制脉冲，并且以虚线示出了施加到转换器的相应第二开关的控制脉冲。在图7中，在每个给定的开关周期t1期间，第一开关被控制成在周期t3导通，并且第二开关被控制成在剩余的周期，即t1-t3＝t4导通。
可选DC/DC转换器21、22和2N可被实现为DC/DC升压转换器，每个DC/DC升压转换器包括开关S31、S32、S3N、无功反馈二极管D31、D32、D3N以及二极管D81、D82、D8N。DC/AC转换器30可被实现为包括四个二极管D101、D102、D103和D104的单相桥整流器。而DC/AC转换器40从而可被实现为桥逆变器，在到AC网络50的两相输出的情况下，该桥逆变器包括四个开关S4、S5、S6和S7、以及优选地与所述开关反并联连接的无功反馈二极管D4、D5、D6和D7。另外，DC/AC转换器40优选地包括适当的输出滤波器FO。例如，在到AC网络50的三相输出的情况下，DC/AC转换器40可以被实现为在三个臂中包括六个开关的桥逆变器。
根据实施例，至少两个单相DC/AC转换器21、22和2N以及隔离变压器T以谐振模式运行。可以使用各种谐振拓扑，以便实现转换器器件的软开关条件以及由此的整流损耗的降低。特别地，由于ZVS(零电压开关)和ZCS(零电流开关)操作，软开关允许半导体开关损耗减小到几乎为零。谐振现象可以通过不同的构造来实现。典型的构造包括LC和LLC谐振回路(resonant tank)。LC和LLC谐振回路之间的选择取决于特定的转换器设计。也可以结合本发明利用谐振现象。根据实施例，如图1和图2所示，至少两个单相DC/AC转换器经由一个或者更多个电容器形式的谐振电容器Cr连接到隔离变压器T。另外，图1和图2的示例性构造包括电感器Lm和Lr，电感器Lm和Lr与电容器Cr一起形成“T”LLC电路，以实现谐振。应注意的是，电感器Lm和Lr可以是分离的部件，例如，一个或者更多个电感器，或者可被实现为集成在隔离变压器T的漏电感和励磁电感中。然而，这对本发明没有意义。谐振电容器Cr以及电感器Lm和Lr的值应该被选择为使得它们在一起谐振。谐振电路的详细设计(诸如要使用的特定的部件值)取决于特定的转换器设计，因此为了简洁起见，在此不更详细地说明。
图8示出如下装置中的开关S21和S12的电压(粗线)和电流(虚线)：该装置对应于图1和2的构造，但是仅包括两个单相DC/AC转换器11和12。当使用如上结合图6或图7所述的交织调制时，当与可以在图中看出的电压相比时，通过开关S21和S12以及由此通过隔离变压器T的电流具有双倍的频率。
在没有谐振电路从而没有谐振现象的情况下，也可以使用图1的构造。图3示出如下转换器装置的框图：该转换器装置对应于图1的装置，但是缺少谐振电容器Cr和电感器Lm，并且优选地包括在该装置的次级侧的附加电感器Ls，以便减小输出侧的电流纹波并且降低二极管反向恢复期间的系统的整流损耗。图3的装置另外可以以与图2的电路图所示的方式类似的方式来实现。在没有谐振电路的情况下，转换器以硬开关模式运行。要以图3的构造使用的调制技术可以与如上已经结合图1和图2的构造描述的交织调制相同。因此，本发明所提出的交织调制既可以与谐振也可以与非谐振转换器结合使用。因而，控制装置60对于谐振和非谐振转换器构造可以是相同的。图9示出如下装置中的开关S21和S12的电压(粗线)和电流(虚线)：该装置对应于图3的构造，但是仅包括两个单相DC/AC转换器11和12。如可以从图9看出的那样，硬开关模式中的操作导致与软开关模式中不同的电流形式，但是，当与电压相比时，通过转换器的输出极以及由此通过隔离变压器T的电流具有N倍的频率，即，当N＝2时为双倍。
图4和5示出根据实施例的另一可替选构造的框图和电路图。在该可替选构造中，通过在单相DC/AC转换器11、12和1N中分别使用与谐振电感器Lr和变压器T一起谐振的两个电容器Cr11和Cr21、Cr12和Cr22、以及Cr1N和Cr2N来引起谐振现象。因此，谐振现象在DC链级已经被引入。在图5的构造中，至少两个单相DC/AC转换器中每个的输出极通过两个电容器的连接点以及转换器的两个可控开关的连接点而形成。要以图4和5的构造使用的调制技术优选地与如上已经结合图1和2的构造描述的交织调制相同。如下装置中的开关S21和S12的电压和电流对应于图8所示的电压和电流：该装置对应于图4和5的构造，但是仅包括两个单相DC/AC转换器11和12。
根据以上实施例中的任何一个或者其组合来控制单相DC/AC转换器11、12和1N的控制装置60，其可被实现为被配置成实现各个实施例的功能的一个单元或者两个或更多个分离的单元。这里术语“单元”一般指的是物理或者逻辑实体，诸如物理设备或者其部分或者软件例程。例如，根据任何一个实施例的控制装置60可至少部分借助于一个或者更多个计算机或者设置有适当软件的相应的数字信号处理(DSP)设备来实现。这种计算机或者数字信号处理设备优选地至少包括：提供用于数学运算的存储区域的工作存储器(RAM)，以及诸如通用数字信号处理器的中央处理单元(CPU)。CPU可包括寄存器集合、算术逻辑单元以及控制单元。CPU控制单元由从RAM传送到CPU的程序指令序列进行控制。CPU控制单元可包含多个用于基本操作的微指令。微指令的实现可取决于CPU设计而变化。程序指令可通过编程语言进行编码，编程语言可以是高级编程语言(诸如C、Java等)或者低级编程语言(诸如机器语言或者汇编程序)。计算机还可具有操作系统，操作系统可向写有程序指令的计算机程序提供系统服务。实现本发明的计算机或者其它设备或者其部分还可包括适当的用于接收例如测量和/或控制数据的输入装置以及用于输出例如控制数据的输出装置。也可以使用用于实现根据任何一个实施例的功能的特定集成电路或者分立电部件和器件。
如果本发明的功能的至少部分通过软件来实现，则这种软件可以被提供作为包括计算机程序代码的计算机程序产品，该计算机程序代码当在计算机上运行时，使计算机或者相应的装置执行如上所述的根据本发明的功能。这种计算机程序代码可被存储在或者一般被实施于计算机可读介质(诸如适当的存储器，例如快擦写存储器或者光存储器)上，其中该计算机程序代码可从该计算机可读介质被载入到执行该程序代码的单元。另外，例如，实现本发明的这种计算机程序代码可经由适当的数据网络被载入到执行该计算机程序代码的单元，并且其可替代或者更新可能现有的程序代码。
本领域的技术人员应当清楚，随着技术前进，可以以多种方式来实现本发明的基本思想。因此，本发明及其实施例不限于以上示例，而是可以在权利要求的范围内变化。

Claims (16)

1.一种转换器装置，包括：
至少两个单相DC/AC转换器(11，12，1N)；
控制装置(60)，配置为控制所述至少两个单相DC/AC转换器；以及
隔离变压器(T)，其中
所述至少两个单相DC/AC转换器(11，12，1N)的输出与彼此以及与所述隔离变压器(T)的输入级联连接；并且
所述控制装置(60)配置为控制所述至少两个单相DC/AC转换器(11，12，1N)，以轮流将电力从它们的输入传递到它们的输出。
2.根据权利要求1所述的装置，其中，所述控制装置(60)配置为控制所述至少两个单相DC/AC转换器(11，12，1N)中的每个，以在传递周期将电力从其输入传递到其输出，使得所述至少两个单相DC/AC转换器中的每个在预定开关周期期间具有一个传递周期，其中，当所述至少两个单相DC/AC转换器的数量是N时，一个这种传递周期的长度是所述预定开关周期的100％/2N，并且两个不同的单相DC/AC转换器的两个连续的传递周期的起始时间间隔所述预定开关周期的100％/N。
3.根据权利要求2所述的装置，其中，所述至少两个单相DC/AC转换器(11，12，1N)均包括具有两个可控开关(S11，S21，S12，S22，S1N，S2N)的半桥，并且所述控制装置(60)配置为通过控制所述开关来控制所述至少两个单相DC/AC转换器。
4.根据权利要求3所述的装置，其中，所述两个可控开关(S11，S21，S12，S22，S1N，S2N)包括连接到所述转换器的正DC极的第一开关(S11，S12，S1N)以及连接到所述转换器的负DC极的第二开关(S21，S22，S2N)，所述控制装置(60)配置为控制所述至少两个单相DC/AC转换器中每个的所述第一开关在其所属的DC/AC转换器的传递周期导通，并且控制所述至少两个单相DC/AC转换器中每个的所述第二开关在同一DC/AC转换器的所述第一开关不导通时导通。
5.根据权利要求4所述的装置，其中，所述至少两个单相DC/AC转换器(11，12，1N)中每个的两个输出极由所述转换器的负DC极和所述两个可控开关(S11，S21，S12，S22，S1N，S2N)的连接点形成。
6.根据权利要求4所述的装置，其中，所述至少两个单相DC/AC转换器(11，12，1N)中每个的两个输出极由两个相互串联连接的电容器(Cr11，Cr21，Cr12，Cr22，Cr1N，Cr2N)的连接点以及所述两个可控开关的连接点形成，其中所述两个相互串联连接的电容器与所述两个可控开关(S11，S21，S12，S22，S1N，S2N)并联连接。
7.根据权利要求1到6中任一项所述的装置，其中，所述至少两个单相DC/AC转换器(11，12，1N)和所述隔离变压器(T)以谐振模式操作。
8.根据权利要求5和7所述的装置，其中，所述至少两个单相DC/AC转换器(11，12，1N)经由谐振电容器(Cr)连接到所述隔离变压器(T)。
9.根据权利要求6和7所述的装置，其中，所述两个相互串联连接的电容器(Cr11，Cr21，Cr12，Cr22，Cr1N，Cr2N)配置为作为谐振电容器操作。
10.根据权利要求1到9中任一项所述的装置，其中，所述装置还包括由所述隔离变压器(T)供电的AC/AC转换器(30)。
11.根据权利要求1到10中任一项所述的装置，其中，所述装置还包括用于通过一个或者更多个光电池(PV1，PV2，PVN)为所述单相DC/AC转换器(11，12，1N)中的每个供电的装置。
12.根据权利要求11所述的装置，其中，用于通过一个或者更多个光电池为所述单相DC/AC转换器(11，12，1N)供电的所述装置包括DC/DC转换器(21，22，2N)。
13.一种用于控制这样装置中的单相DC/AC转换器的方法，所述装置包括至少两个单相DC/AC转换器(21，22，2N)和隔离变压器(T)，其中，所述至少两个单相DC/AC转换器(21，22，2N)的输出与彼此以及与所述隔离变压器(T)的输入级联连接，所述方法包括：
轮流控制所述至少两个单相DC/AC转换器(21，22，2N)中的每个，以在传递周期中将电力从其输入传递到其输出，使得所述至少两个单相DC/AC转换器中的每个在预定开关周期期间具有一个传递周期，其中，当所述至少两个单相DC/AC转换器的数量是N时，一个这种传递周期的长度是所述预定开关周期的100％/2N，并且两个不同的单相DC/AC转换器的两个连续的传递周期的起始时间间隔所述预定开关周期的100％/N。
14.根据权利要求13所述的方法，其中，所述至少两个单相DC/AC转换器(21，22，2N)均包括具有两个可控开关(S11，S21，S12，S22，S1N，S2N)的半桥，其中通过控制所述开关来执行所述至少两个单相DC/AC转换器的控制。
15.根据权利要求14所述的方法，其中，所述两个可控开关包括连接到所述转换器的正DC极的第一开关(S11，S12，S1N)以及连接到所述转换器的负DC极的第二开关(S21，S22，S2N)，其中所述开关的控制包括：
控制所述至少两个单相DC/AC转换器(21，22，2N)中每个的所述第一开关在其所属的DC/AC转换器的传递周期导通；以及
控制所述至少两个单相DC/AC转换器(21，22，2N)中每个的所述第二开关在同一DC/AC转换器的所述第一开关不导通时导通。
16.一种包括计算机程序代码的计算机程序产品，其中，所述程序代码在计算机中的执行使所述计算机进行根据权利要求13到15中任一项所述的方法的步骤。
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