CN102577007B - 电功率转换系统和方法 - Google Patents

电功率转换系统和方法 Download PDF

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CN102577007B
CN102577007B CN201080043233.XA CN201080043233A CN102577007B CN 102577007 B CN102577007 B CN 102577007B CN 201080043233 A CN201080043233 A CN 201080043233A CN 102577007 B CN102577007 B CN 102577007B
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power
synchronous machine
type inverter
input
thyristor bridge
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CN102577007A (zh
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E·斯普纳
D·塔弗
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Openhydro IP Ltd
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    • 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
    • H02M7/54Conversion of dc power input into ac power output without possibility of reversal by dynamic 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
    • H02J3/36Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L8/00Electric propulsion with power supply from forces of nature, e.g. sun or wind
    • 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
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product
    • 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
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

本发明描述了用于电功率转换的系统(20)和方法。该系统(20)预期用于将来自涡轮发动机的高压DC功率输出转换成适合于连接到AC电网的AC功率信号。该系统(20)利用驱动同步发电机(28)的同步电机(26)之间的机械耦合(27)以便提供隔离,以及允许通过该系统控制实际功率输出。

Description

电功率转换系统和方法
发明领域
本发明涉及功率转换系统和方法,尤其是用于连接到AC电网的潮汐发电装置的功率转换系统。
发明背景
很多采用可再生能量的发电形式使用发电机,并使发电机以根据当时的情况而改变的速度来被驱动。例如,风力涡轮机以依赖于风速的速度驱动其发电机,潮流涡轮机以依赖于水流的当时速度的速度驱动其发电机,而波能转换器可包括以按循环方式变化的速度来驱动的发电机。在这样的情况下,来自发电机的电输出的电压和频率不断地变化。然而,电网以固定的电压和频率操作,且以电网代码体现的严格规章应用于将连接到电网的发电系统。
对于大的发电系统例如潮流涡轮机的风力农场和组,电网代码一般包括下面的主要需求:
1.发电系统应能够通过具有独立于当时的风速、潮汐速度等而修改其实际功率输出的能力来促进电网频率的控制。
2.发电系统应能够通过具有提供高达所供应的实际电流的某个限定的部分的无功功率的能力来促进电网电压的控制。
3.发电系统应能够产生具有正弦波形的电流。该电流应没有DC分量,且所有谐波和子谐波分量应小于规定的上限。
4.发电系统应能够在电网上的整个低电压瞬时故障期间保持连接到电网,所以当故障被清除时准备继续供应功率。
为了遵守这些规章中的第一个,大部分大的风力涡轮机包括节距控制机构以调节由桨叶产生的高达相应于当时风速的最大值的机械功率。
为了遵守第二和第三个规章,来自发电机的功率通常使用脉冲宽度调制(PWM)逆变器通过功率系统转换成50或60Hz固定频率三相ac。
为了遵守最后一个规章,逆变器被控制以限制输出电流而不是简单地断开,以保护逆变器免受短路。
具有高达690Vrm线-线的输出电压额定值的适当逆变器是可用的,该电压是优选标准电压之一。较高的电压是可能的,但它们以增加的成本、较低的效率和较低的调制频率为代价实现,导致被发送到电网的较高的谐波电流和因而对辅助滤波器的需要。使用经由变压器连接到电网的690V逆变器因此是正常的,该变压器将电压逐步增加到连接点处的电网电压。
对于基于陆地的风力涡轮机,这个装置是令人满意的。然而,对于所提出的潮流涡轮机,这个装置呈现几个困难。
首先,位于海床上的潮流涡轮机将需要非常大和昂贵的海底外壳来容纳所述形式的转换设备。在设备中的任何故障将需要昂贵的海上操作来取回并更换该设备,且工作可能在长时期内被当时天气情况延迟。通常,将尽可能多的设备定位在电缆的接收端处因此是合乎需要的,该电缆将来自涡轮机的功率带到海岸用于连接到电网或连接到容纳从一组这样的涡轮机接收功率的特殊变电站的离岸平台。
由于传输距离,使用适度地高的传输电压以减小传输损失是优选的。例如,经由具有250mm2导体横截面的双芯电缆在5km的距离上以4%的传输损失传输5MW需要大约10KV的操作电压。这个幅值的电压可由发电机产生,所以存在在涡轮机处不需要电功率转换设备的系统的可能性。
由于海底电缆及其安装的高成本,所以有共享公共电缆的尽可能多的涡轮机是合乎需要的。如果每个涡轮机的电输出是AC,则其输出必须被同步,如果它们连接在一起。然而,如果涡轮机输出是DC,则它们可安全地并联连接,假定它们可在相同的电压处操作。
由于节距控制机构在海底环境中的高成本和故障风险,所以使用具有固定节距桨叶的涡轮机是优选的。由于简单性和效率,使用由没有中间变速箱的涡轮机直接驱动的发电机并使用发电机磁场的永久磁铁励磁是进一步优选的。AC输出通过二极管容易并有效地转换成DC,二极管可嵌在发电机绕组或接线盒中。涡轮机和发电机的旋转速度以及相关的输出功率于是依赖于当时的流量和涡轮机-发电机-二极管所馈送的DC系统的电压。
对一组潮汐涡轮机的优选功率布置因此如图1所示,图1示出了产生直流输出(经由整流二极管12)的一系列涡轮发电机10。发电机10由一组短电缆14和一个较长的电缆16并联连接到接收台18。接收台18可以在岸上,或可以设置在用于维修设备的通路是可能的离岸平台上。接收台18的输出连接到AD电网。
用于将HVDC连接到AC功率的已知方法是通过使用晶闸管逆变器电路。图2示出了具有晶闸管100的阵列的三相电流源晶闸管逆变器。在操作期间,DC电压施加在端子A两端。控制晶闸管100的点弧角的信号的相位交错,以便在端子X、Y和Z处提供三相AC信号。晶闸管逆变器提供效率和可靠性的组合以及相对廉价的优点。
虽然已知电流源晶闸管逆变器用于HVDC到AC功率的转换,但是电流源晶闸管逆变器通常不适合于电网连接,因为它们产生大振幅谐波电流并从电网提取无功功率。此外,电流源晶闸管逆变器依赖于使电压在晶闸管的导电期结束时关断晶闸管的电网,所以它不能在低电压电网故障期间操作。
Michael Owen的“Homopolar Electro-mechanical Rotary PowerConverter(HERPC)”(IEEE Melecon 2004,2004年5月12-15日,Dubrovnik,Croatia)公开了用于将高压DC功率转换成AC电网电源的功率转换系统,该系统包括:用于接收高压DC功率输入的线电压输入;用于将所述高压DC功率输入转换成AC功率的转换器模块;同步电机,所述同步电机由所述转换器模块所提供的AC功率驱动;以及可操作来提供AC输出功率用于连接到电网电源的同步发电机,其中所述同步发电机由所述同步电机驱动。
本发明的目的是提供可在高DC电压处操作并满足电网代码的所有需要的DC到AC转换器。
发明概述
因此,提供了根据权利要求1的特征部分的功率转换系统。
因为同步发电机由同步电机驱动,因此存在机械隔离级,其防止来自原始DC输入信号或从所转换的AC信号的任何谐波的馈通。虽然本发明主要打算用在潮汐涡轮机的阵列上,但是应理解,它可在其它功率转换环境例如离岸风力涡轮机或波能转换器中使用。此外,可实现具有相对简单和经济的设计的基于陆地的风力涡轮机,以用在根据本发明的功率转换系统上。将理解,同步发电机的驱动直接连接到同步电机的轴,或可能有在电机和发电机之间耦合的任何适当的机械耦合。
优选地,所述转换器模块包括多相晶闸管桥式逆变器。
多相晶闸管桥式逆变器的相的数量可被选择为减小馈送到同步电机的谐波电流、和/或波纹电流和反馈回线电压输入的电压的效应。
优选地,所述转换器模块包括三相晶闸管桥式逆变器。
优选地,所述同步电机的相数量等于多相晶闸管桥式逆变器中的相的数量。
可选地,转换器模块还包括变压器,变压器用于将多相晶闸管桥式逆变器的输出转换成具有适合于驱动所述同步电机的电压的AC功率。
优选地,该系统还包括控制器,控制器可操作来通过调节晶闸管桥式逆变器的相角以改变DC线电压输入来控制所述AC输出功率的实际功率分量,以调节所述涡轮发电机的操作。
当晶闸管桥式逆变器操作被调节时,这允许相关的涡轮发电机的DC线电压的变化。线电压的调节影响涡轮机的操作条件,且相应地允许由转换系统提供到电网的实际功率的调节。
此外或可选地,所述同步电机是磁场绕组型同步电机,所述系统包括控制器,控制器可操作来通过调节同步电机的磁场绕组励磁以改变DC线电压输入来控制所述AC输出功率的实际功率分量,以调节所述涡轮发电机的操作。
类似地,当同步电机的激励磁场变化时,在电机端子处的AC电压且因此DC线电压改变,允许输出AC功率的实际功率分量通过相关涡轮机的操作条件的调整而被调节。
优选地,所述系统还包括与所述同步电机并联地设置的辅助负载电路,其中所述系统可操作来供应由所述转换器模块提供到所述辅助负载电路的AC功率的至少一部分。
辅助负载电路的提供意味着由相关的涡轮发电机产生的任何过剩的功率可被放电到负载电路中,允许转换系统满足所需的电网条件。
优选地,辅助负载电路包括存储来自所述转换器模块AC功率的储能设备,其中所述储能设备还可操作来选择性地向所述同步电机提供存储在设备中的AC功率。
因为辅助负载电路包括储能设备,例如电池、飞轮、电容器等,因此由相关的涡轮机产生的过剩的功率可被存储并提供到在后面的级处的能量转换系统。这可以是对潮汐涡轮发电机的情况,其中过剩的功率可在高潮流时期期间被存储,并在低潮流期期间和/或对电网的高需求期期间被释放回到转换系统(以及进而扩展到电网)中。
此外或可选地,辅助负载电路包括负载箱。
负载箱可用作放弃多余的功率并确保转换系统继续满足电网需求的有效方法。
还提供了根据权利要求11的特征部分的用于将来自涡轮发电机高压的DC功率转换成AC电网电源的方法。
优选地,该方法包括通过改变DC功率输入的线电压来控制同步发电机的实际功率输出以调节所述涡流发电机的操作的另一步骤。
优选地,所述转换步骤包括控制多相晶闸管桥式逆变器的相角,且其中所述控制步骤包括调节晶闸管桥式逆变器的相角以改变DC线电压输入。
此外或可选地,所述控制步骤包括调节同步电机的励磁以改变DC功率输入的线电压。
优选地,该方法还包括当同步发电机的输出超出所需水平时将所述转换的AC功率的至少一部分转移到辅助负载电路的步骤。
本发明的详细描述
现在将仅作为例子参考附图来描述本发明的实施方案,其中:
图1示出现有技术潮汐涡轮机的设置;
图2示出已知的晶闸管逆变器电路;
图3是根据本发明的功率转换系统的视图;
图4是图3的系统的第一增强的视图;
图5是图3的系统的第二增强的视图;
图6是样本涡轮机特征曲线的曲线图;
图7是在具有不同的潮汐速度的阵列中操作的一组五个涡轮机的涡轮机特征曲线的曲线图;
图8是还包括负载箱电路的图3的系统的视图;以及
图9是还包括储能设备电路的图3的系统的视图。
为了提供与适当的实际和无功功率控制结合的具有所需隔离的转换系统,功率由电机所驱动的同步发电机输送到AC电网。从接收自一个或多个涡轮机并转换成适合于馈送到电机的形式的高压直流电给电机供应功率。
参考图3,通常在20示出了根据本发明的功率转换系统。在输入端子22处提供高压DC(HVDC)功率。进入的HVDC通过电流源晶闸管逆变器24转换成AC。具有高达大约8kV的电压额定值的单独的晶闸管是可用的。因此,图3所示的电路将适合于具有高达大约5kV的DC电压的系统。
所转换的AC功率接着用于驱动同步电机26。因为进入的HVDC功率通常对于是电机类型的实际选择的DC电机在太高的电压处,相应地,图3的装置利用具有用于励磁的常规磁场绕组或永久磁铁的AC同步电机26。
同步电机26(轴27)的输出耦合到同步发电机28的输入。同步发电机28提供AC输出30,其可容易直接连接到AC电网。这样的同步发电机可以具有与可能在由化石燃料供燃料的常规发电站中找到的相同的类型。这样的发电机将满足电网代码的大部分要求,且在高达1GW的功率额定值的情况下是可用的。
如上所述,通常,电流源晶闸管逆变器不适合于电网连接。然而,在本发明的系统中,电流源晶闸管逆变器未连接到电网,而是连接到同步电机,其提供必要的无功功率和用于按需要关断晶闸管的电压。此外,同步电机在很多程度上不被谐波电流影响。
驱动同步发电机的同步电机的机械耦合提供了晶闸管逆变器与电网连接的不完整性的机械隔离。因此,图3的系统提供了用于将HVDC转换到AC电网电源的转换系统。
如上所述,图3的系统将适合于具有高达大约5kV的DC输入电压的系统。然而,如果最大DC输入电压高于这个值,例如高达10kV,则初始转换级可能改变。例如,如可在图4中看到的,晶闸管桥24使用串联的两个晶闸管来构建,允许较高的输入电压额定值。
可选地,关于图5的电路,两个或多个完整的晶闸管逆变器24可串联连接在其DC输入处,其AC输出如图5所示被组合为一对转换变压器32的输入。变压器32的AC输出接着被组合,并作为输入被提供到同步电机26。
图5所示的转换变压器32中的每个具有两个分离的输入绕组34,每个输入绕组由专用逆变器桥接逆变器供应,一个绕组34a是星形连接的,而另一绕组34b是三角形连接的。这两个桥供应在相位上相差30电度的电流,且在输出绕组处的电流遵循12脉冲模式。这具有比单个三相桥所产生的6脉冲模式小得多的谐波电流。用于减小整流器和晶闸管电路中的电流的谐波含量的这种布置避免与谐波电流相关的同步电机26中的一些损耗。
图3-5所示的系统使用三相逆变器,但按需要使用不同数量的相将是可能的。这可能是优选的,以便限制馈送到同步电机26的谐波电流或在DC系统上的波纹电流和电压。
将理解,虽然来自电流源晶闸管逆变器24的AC输出可通过适当连接的变压器32转换成三相,可选地,同步电机26可配置成具有与逆变器24使用的相同数量的相。
通常,晶闸管逆变器24需要具有超过输入DC电压的峰值的AC电压。转换变压器34因此在使晶闸管逆变器24的电压与匹配相关电机26的额定值的值匹配时具有另一目的。
同步发电机28的旋转速度耦合到AC电网的频率。例如,连接到50Hz电网的两极发电机必须以3000rpm旋转,四极机器以1500rpm旋转,六极机器以1000rpm旋转,等等。优选的机械布置是将电机26直接耦合到发电机28,在这种情况下,电机26以相同的速度旋转。电机26不必具有与发电机28相同数量的极。类似地,在电机26的AC端子处的AC电流和电压的频率关联到电机26的旋转速度。
如果电机26的极数和发电机28的极数相等,且这两个机器经由轴27直接耦合来以相同的旋转速度运转,则在电机26的输入处的电压和电流的频率等于ac电网的频率——该布置允许对电机26和发电机28使用相同的机器。
如果电机26具有比发电机28高的极数,则电机频率高于电网频率。可选地,如果在电机26和发电机28之间的耦合使电机26比发电机28旋转地更快(例如借助于变速箱),则电机频率将高于发电机频率。
相反,如果电机26的极数小于发电机28的极数,或如果电机26的旋转速度低于发电机28的旋转速度(由于在这两个机器之间使用的耦合),则电机频率低于电网频率。
例如,驱动连接到50Hz电网的四极发电机的六极电机将需要75Hz的供电频率。在以这种方式安排待升高的电机频率时的一个优点是,变压器的物理尺寸和效率部分地取决于操作频率。通过选择适当的操作频率,转换器变压器34相应地可被制造得更小和更有效。
图6示出了涡轮机特征曲线的例子。为了控制输送到电网30的实际功率,DC电压可被控制,这又影响相关涡轮机的操作条件和它们所输送的功率。例如,如果电压升高,则每个涡轮机的速度将增加,导致根据一般涡轮特征产生的功率的改变。
实际上,在一组涡轮机中,由于越过海床区域的流量的变化,每个涡轮机将受到与其它涡轮机不同的流量。因此,每个涡轮机具有功率相对于速度(且因而电压)的不同特征,但该组作为整体具有功率相对于DC电压的综合特征。图7示出一起操作但具有范围从1.8到2.6m/s的不同潮汐速度的五个涡轮机的例子。如果这些涡轮机并联连接使得它们都在比如5kV处操作,则总功率将为大约2100kW。具有最高流量的涡轮机将在比最佳值稍微更低的电压处操作,且具有最低流量的涡轮机将在比最佳值稍微更高的电压(且因而速度)处操作。如果电压升高到比如6kV,则总功率将减小到大约1900kW。将电压升高到8kV将总功率减小到小于1MW。电压控制因此是按需要调节功率的适当方式,用于与电网代码的兼容。
可通过馈送到所使用的晶闸管逆变器24的晶闸管栅极端子的转换信号的相控制来调节DC电压。可选地,如果同步电机26由常规磁场绕组激励,那么同步电机26的激励可被控制,使得在其端子处的AC电压以及依次对相关涡轮机呈现的DC线电压被按需要调节。
图8示出另一可选的实施方案,其中可通过将过剩的功率丢弃到与同步电机26并联的辅助负载例如电阻负载箱36中来影响输送到电网30的功率的控制。在图8中,电阻负载箱36由半控制的晶闸管桥式逆变器38控制,晶闸管桥式逆变器38是对被控制的整流所需的一切。半控制的桥38使用同步电机26的电压来关断桥38的晶闸管,并提供由桥38吸收的无功功率。
可选地,如图9所示,过剩的功率被提供到与电机26并联的储能设备例如电池40,电池40与适当的整流器电路耦合42。图9所示的系统不仅满足对功率控制的需要,而且还提供使用储能系统(电池40)来在高潮流期期间从涡轮机吸收能量并在以后的时间将这个多余的功率提供到电网30的可能性。
预期当涡轮机产生高功率时的高潮流期常常不与对电网30的高需求的时期重合。储能系统因此可增加所产生的能量的值,以及提供用于遵守电网代码的功率和频率规章方面的方式。此外,能量系统可通过操作在逆功率流配置中的同步电机26和发电机28在潮流低时从电网30提取能量,由此电机26作为发电机操作,反之亦然。在这种情况下,能量可在低需求时从电网30被吸收而在高需求时返回。这提供了图9的实施方案的另一额外的优点。
本发明不限于本文所述的实施方案,而是可被修正或修改,而不偏离本发明的范围。

Claims (15)

1.一种用于将来自涡轮发电机(10)的高压DC功率转换成电网电源(30)的功率转换系统(20),所述系统包括:
线电压输入(22),其用于专有地从一个或多个涡轮发电机(10)接收高压DC功率输入;
转换器模块(24),其用于将所述高压DC功率输入转换成AC功率;
同步电机(26),所述同步电机由所述转换器模块所提供的所述AC功率驱动;以及
同步发电机(28),其可操作来提供AC输出功率用于连接到电网电源,其中所述同步发电机由所述同步电机驱动,
特征在于:
所述转换器模块(24)是晶闸管桥式逆变器。
2.如权利要求1所述的系统,其中所述晶闸管桥式逆变器是多相晶闸管桥式逆变器。
3.如权利要求1所述的系统,其中所述晶闸管桥式逆变器是三相晶闸管桥式逆变器。
4.如权利要求2所述的系统,其中所述同步电机(26)的相数量等于所述多相晶闸管桥式逆变器中的相的数量。
5.如权利要求2所述的系统,其中所述转换器模块(24)还包括变压器(32),所述变压器用于将所述多相晶闸管桥式逆变器的输出转换成具有适合于驱动所述同步电机(26)的相的AC功率。
6.如权利要求1所述的系统,其中所述系统(20)还包括控制器,所述控制器可操作来通过调节所述晶闸管桥式逆变器(24)的相角以改变DC线电压输入(22)来控制所述AC输出功率的实际功率分量,以调节所述一个或多个涡轮发电机(10)的操作。
7.如权利要求1所述的系统,其中所述同步电机(26)是磁场绕组型同步电机,所述系统(20)包括控制器,所述控制器可操作来通过调节所述同步电机(26)的磁场绕组励磁以改变DC线电压输入(22)来控制所述AC输出功率的实际功率分量,以调节所述一个或多个涡轮发电机(10)的操作。
8.如权利要求1所述的系统,其中所述系统(20)还包括与所述同步电机(26)并联地设置的辅助负载电路(36),其中所述系统可操作来供应由所述转换器模块(24)提供到所述辅助负载电路(36)的所述AC功率的至少一部分。
9.如权利要求8所述的系统,其中所述辅助负载电路(36)包括存储来自所述转换器模块(24)的AC功率的储能设备(40),其中所述储能设备还可操作来选择性地向所述同步电机(26)提供存储在所述设备中的AC功率。
10.如权利要求8所述的系统,其中所述辅助负载电路(36)包括负载箱。
11.一种用于将来自一个或多个涡轮发电机(10)的高压DC功率转换成电网电源(30)的方法,包括下列步骤:
将专有地从一个或多个涡轮发电机(10)接收的高压DC功率输入(22)提供到线电压输入(22);
将所述高压DC功率输入(22)转换成AC功率;
使用所述转换的AC功率来驱动同步电机(26);
使用所述同步电机(26)的输出来驱动同步发电机(28),其中所述同步发电机可操作来输出电网电源(30);
特征在于:
所述转换步骤包括控制晶闸管桥式逆变器(24)的相角。
12.如权利要求11所述的方法,其中所述方法还包括通过改变DC功率输入(22)的线电压来控制所述同步发电机(28)的实际功率输出以调节所述一个或多个涡流发电机的操作的步骤。
13.如权利要求12所述的方法,其中所述控制步骤包括调节所述晶闸管桥式逆变器的相角以改变DC线电压输入(22)。
14.如权利要求12所述的方法,其中所述控制步骤包括调节所述同步电机(26)的励磁以改变DC功率输入(22)的线电压。
15.如权利要求11所述的方法,其中所述方法还包括当所述同步发电机(28)的所述输出超出所需水平时将所述转换的AC功率的至少一部分转移到辅助负载电路(36)的步骤。
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