CN111628665B - 一种基于串联数字化稳压器的中高压电力电子变压器 - Google Patents

一种基于串联数字化稳压器的中高压电力电子变压器 Download PDF

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CN111628665B
CN111628665B CN202010480717.6A CN202010480717A CN111628665B CN 111628665 B CN111628665 B CN 111628665B CN 202010480717 A CN202010480717 A CN 202010480717A CN 111628665 B CN111628665 B CN 111628665B
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voltage stabilizer
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CN111628665A (zh
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王建华
范建华
徐鹏飞
李健勋
王嘉伟
王庆园
李鸿儒
张建
李伟
吴雪梅
卢峰
林志超
程艳艳
叶齐
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Qingdao Dingxin Communication Power Engineering Co ltd
Qingdao Topscomm Communication Co Ltd
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Shenyang Keyuan State Grid Power Engineering Survey And Design Co ltd
Qingdao Topscomm Communication Co 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
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/219Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
    • 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
    • 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
    • H02M1/14Arrangements for reducing ripples from dc input or output
    • 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584Bidirectional converters
    • 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
    • H02M7/53Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875Conversion 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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output

Abstract

本发明公开了一种基于串联数字化稳压器的中高压电力电子变压器,属于电力电子变压器技术领域。其系统结构包括电网侧L滤波器一端与电网相连,另一端接入CHB交流侧,CHB相级联后与由直流侧电压不同的H桥结构串联构成的数字化稳压器交流侧一端相连,最后三相的数字化稳压器交流侧剩余端连接到一点,CHB高压直流侧和数字化稳压器的直流侧分别与DAB的高压直流侧相接,各模组DAB低压直流侧相并联,与输出级DC/AC直流侧相接。本发明通过增加数字化稳压器来减少高压模组数量和开关频率,减少系统成本和提升系统效率,而且还可以增加调制的电平数量,来减少电流中的纹波,可大大降低滤波电感的感值,减少滤波成本,提升系统性能。

Description

一种基于串联数字化稳压器的中高压电力电子变压器
技术领域
本发明涉及中高压电力电子变压器技术领域,尤其涉及一种基于串联数字化稳压器的中高压电力电子变压器。
背景技术
在电力系统中,电能从发电厂发出,经由变压器变换后进入输电线路,输电线路中的电能由变压器变换后进入配电线路,配电线路中的电能再由变压器变换后分配给用户,可见,变压器在其中起着不可替代的作用,是其中非常重要的一环。而传统的变压器存在体积大、损耗大、磁芯饱和和易对环境造成污染等缺陷,已经越来越满足不了人们的需求。
因此,电力电子变压器应运而生,其不仅可以实现高压直流输电、静止无功补偿、有源电力滤波等功能,而且使电力系统输电方式更加灵活多变,同时对电网电能质量也有一定改善。其工作过程可大致描述为:电力电子变压器分为三级结构:输入级、隔离级、输出级。输入级AC/DC部分,将电网三相交流电变为高压直流电,进入隔离级,隔离级DC/DC部分实现电压等级变换和电气隔离功能,将高压直流电转变为低压直流电,低压直流电输入到输出级,输出级DC/AC部分将低压直流电变为220V交流电,供给用户使用。
由于电力电子变压器需要进行高等级的电压变换,对其中各部分器件的要求较高,尤其是输入级AC/DC部分,所以采用多模块级联的方式进行分压来减轻所承受的电压,但现有的电力电子变压器输入级AC/DC部分由于模块数较多,会产生控制难易程度较高、成本高、体积大等问题。而且输入级AC/DC部分对电压进行调制过程中产生的电平数量较少,会产生高频纹波,增加系统损耗,不利于电气设备的正常运行,虽然增加模块数量可以增加电平数量,但会带来成本问题。
发明内容
本发明针对上述缺陷及需求,提供了一种基于串联数字化稳压器的中高压电力电子变压器,该电力电子变压器通过加入一个数字化稳压器,来替代输入级AC/DC中的部分H桥结构,来减少模组的数目,减少系统的成本,同时提高调制过程中的电平数目,减少电流中的高频纹波,提高系统效率。
为了实现上述目的,本发明提供了如下技术方案:一种基于串联数字化稳压器的中高压电力电子变压器,包括电网侧的L滤波器、高压侧输入级AC/DC变换器CHB、数字化稳压器、中间隔离级DC/DC变换器DAB、输出级DC/AC变换器,电网侧的L滤波器一端与电网相连,另一端接入单模组CHB交流侧其中一端,该单模组CHB交流侧另一端与其他CHB模组相级联,最后一个CHB模组交流侧剩余一端与数字化稳压器交流侧一端相连,最后三相的数字化稳压器交流侧剩余端连接到一点,CHB高压直流侧和数字化稳压器的直流侧分别与DAB的高压直流侧相接,各模组DAB低压直流侧相并联,与输出级DC/AC直流侧相接,三相相同。
进一步地,高压侧输入级AC/DC变换器CHB由H桥模块构成,H桥分为左右两个桥臂,每个桥臂有两个串联的IGBT模块,每个IGBT模块包括一个IGBT和一个反并联二极管;L滤波器每相由一个电感构成,电感一端与电网相连,另一端接入CHB的H桥左桥臂中点,右桥臂中点与后一个模组CHB左桥臂中点相级联。
进一步地,中间隔离级DC/DC变换器DAB包括两个H桥结构和一个中频变压器,两个H桥分别位于中频变压器原边和副边,用于DC/AC变换器和AC/DC变换器,DAB高压直流侧与CHB直流侧相接,经过中频变压器后,DAB低压直流侧输出相并联,形成低压直流母线,连接到输出级DC/AC直流侧部分。
进一步地,数字化稳压器由直流侧电压Vdci(i=1,2,3…N)不同的N个H桥结构串联构成,H桥分为左右两个桥臂,每个桥臂有两个串联的IGBT模块,每个IGBT模块由一个IGBT和一个反并联二极管组成,数字化稳压器第一个H桥结构的左桥臂中点接CHB交流侧最后一个右桥臂中点,数字化稳压器内部每个H桥结构左桥臂中点接上个H桥结构右桥臂中点,最后三相的数字化稳压器所剩余的一个右桥臂中点汇总于一点,形成星型结构。
其中,数字化稳压器直流侧电压Vdci可由数字化稳压器的低压模组数N和CHB高压模组直流侧电压Udc计算得出,计算公式为:
Vdci=Udc/2i
进一步地,不串联数字化稳压器的CHB结构,在高压模组数为n的情况下,可调制出2*n+1种电平数量;串联数值化稳压器后的调制电平数m,可由数字化稳压器的低压模组N和每相的CHB的高压模组数n计算得出,计算公式为:
m=[(n+1)*2N-1]*2+1。
与现有电力电子变压器相比,本发明的优点和积极效果在于:通过加入数字化稳压器,来降低电力电子变压器的高压模组数量和高压模组的开关频率,减少系统成本和提升系统效率,而且可以通过数字化稳压器不同等级的直流侧电压来增加调制的电平数量,来减少电流中的纹波,可大大降低滤波电感的感值,减少滤波成本,提升系统性能。
附图说明
图1是电力电子变压器结构图;
图2是本发明实施例的数字化稳压器拓扑图;
图3是本发明实施例的基于串联数字化稳压器的电力电子变压器电路拓扑图;
图4是两个直流侧电压为Udc高压模组调制电压图;
图5是一个直流侧电压为Udc高压模组和一个直流侧电压为Udc/2的数字化稳压器调制电压图。
具体实施方式
以下,结合附图对本发明的具体实施方式进行进一步的描述。
本发明应用的电力电子变压器结构如图1所示,分为三级结构。输入级为AC/DC变换器,将10kV交流电转换为高压直流电;中间隔离级为DC/DC变换器,将高压直流电转换为低压直流电,并带有电气隔离的作用;输出级为DC/AC变换器,将直流电变换为交流电。
图2为数字化稳压器具体拓扑结构图,由直流侧电压不同的H桥拓扑结构构成。基于串联数字化稳压器的电力电子变压器电路拓扑结构如图3所示,包括电网侧的L滤波器、高压侧输入级AC/DC变换器CHB、数字化稳压器、中间隔离级DC/DC变换器DAB、输出级DC/AC变换器,网侧L滤波器一端与电网相连,另一端接入单模组CHB交流侧其中一端,该单模组CHB交流侧另一端与其他CHB模组相级联,最后一个CHB模组交流侧剩余一端与数字化稳压器交流侧一端相连,最后三相的数字化稳压器交流侧剩余端连接到一点,CHB高压直流侧和数字化稳压器的直流侧分别与DAB的高压直流侧相接,各模组DAB低压直流侧相并联,与输出级DC/AC直流侧相接,三相相同。
所述的高压侧输入级AC/DC变换器CHB由H桥模块构成,H桥分为左右两个桥臂,每个桥臂有两个串联的IGBT模块,每个IGBT模块由一个IGBT和一个反并联二极管组成,所述的L滤波器每相由一个电感构成,电感一端与电网相连,另一端接入CHB的H桥左桥臂中点,右桥臂中点与后一个模组CHB左桥臂中点相级联。
所述的中间隔离级DC/DC变换器DAB由两个H桥结构和一个中频变压器构成,两个H桥分别位于中频变压器原边和副边,起着DC/AC变换器和AC/DC变化器的作用,DAB高压直流侧与CHB直流侧相接,经过中频变压器后,DAB低压直流侧输出相并联,形成低压直流母线,连接到输出级DC/AC直流侧部分。
所述的数字化稳压器由直流侧电压Vdci(i=1,2,3…N)不同的N个H桥结构串联构成,H桥分为左右两个桥臂,每个桥臂有两个串联的IGBT模块,每个IGBT模块由一个IGBT和一个反并联二极管组成,数字化稳压器第一个H桥结构的左桥臂中点接CHB交流侧最后一个右桥臂中点,数字化稳压器内部每个H桥结构左桥臂中点接上个H桥结构右桥臂中点,最后三相的数字化稳压器所剩余的一个右桥臂中点汇总于一点,形成星型结构。数字化稳压器直流侧电压Vdci可由数字化稳压器的低压模组数N和CHB高压模组直流侧电压Udc计算得出,具体为Vdci=Udc/2i。基于串联数字化稳压器的电力电子变压器相比于传统的电力电子变压器每相多了一个数字化稳压器,利用数字化稳压器的低压模组来减少CHB高压模组的使用数量,同时可以增加AC/DC调制的电平数量,来降低系统成本和损耗,提高系统效率。
所述的基于串联数字化稳压器的中高压电力电子变压器相较于传统的电力电子变压器提高了调制的电平数。不串联数字化稳压器的CHB结构,在高压模组数为n的情况下,可调制出2*n+1种电平数量,串联数值化稳压器后的调制电平数m,可由数字化稳压器的低压模组N和每相的CHB的高压模组数n计算得出,具体为m=[(n+1)*2N-1]*2+1。图4为两个直流侧电压为Udc高压模组调制电压图,高压模组可产生+Udc、0、-Udc三种电平,最后输出电压由5种电平构成,分别为+2Udc、+Udc、0、-Udc、-2Udc。图5为一个直流侧电压为Udc高压模组和一个直流侧电压为Udc/2的数字化稳压器调制电压图,高压模组可产生+Udc、0、-Udc三种电平,数字化稳压器可产生+Udc/2、0、-Udc/2三种电平,因此输出总电压可达到7电平,分别为+3Udc/2、+Udc、+Udc/2、0、-3Udc/2、-Udc、-Udc/2,而两个高压模组的情况下只能产生5种电平,因此提高了调制电平数量。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。

Claims (5)

1.一种基于串联数字化稳压器的中高压电力电子变压器,其特征在于:包括电网侧的L滤波器、高压侧输入级AC/DC变换器CHB、数字化稳压器、中间隔离级DC/DC变换器DAB、输出级DC/AC变换器,电网侧的L滤波器一端与电网相连,另一端接入单模组CHB交流侧其中一端,该单模组CHB交流侧另一端与其他CHB模组相级联,最后一个CHB模组交流侧剩余一端与数字化稳压器交流侧一端相连,最后三相的数字化稳压器交流侧剩余端连接到一点,CHB高压直流侧和数字化稳压器的直流侧分别与DAB的高压直流侧相接,各模组DAB低压直流侧相并联,与输出级DC/AC直流侧相接,三相相同。
2.根据权利要求1所述的一种基于串联数字化稳压器的中高压电力电子变压器,其特征在于:高压侧输入级AC/DC变换器CHB由H桥模块构成,H桥分为左右两个桥臂,每个桥臂有两个串联的IGBT模块,每个IGBT模块包括一个IGBT和一个反并联二极管; L滤波器每相由一个电感构成,电感一端与电网相连,另一端接入CHB的H桥左桥臂中点,右桥臂中点与后一个模组CHB左桥臂中点相级联。
3.根据权利要求1所述的一种基于串联数字化稳压器的中高压电力电子变压器,其特征在于:中间隔离级DC/DC变换器DAB包括两个H桥结构和一个中频变压器,两个H桥分别位于中频变压器原边和副边,用于DC/AC变换器和AC/DC变换器,DAB高压直流侧与CHB直流侧相接,经过中频变压器后,DAB低压直流侧输出相并联,形成低压直流母线,连接到输出级DC/AC变换器直流侧部分。
4.根据权利要求1-3任一项所述的一种基于串联数字化稳压器的中高压电力电子变压器,其特征在于:数字化稳压器由直流侧电压Vdci(i=1,2,3…N)不同的N个H桥结构串联构成,H桥分为左右两个桥臂,每个桥臂有两个串联的IGBT模块,每个IGBT模块由一个IGBT和一个反并联二极管组成,数字化稳压器第一个H桥结构的左桥臂中点接CHB交流侧最后一个右桥臂中点,数字化稳压器内部每个H桥结构左桥臂中点接上个H桥结构右桥臂中点,最后三相的数字化稳压器所剩余的一个右桥臂中点汇总于一点,形成星型结构;
其中,数字化稳压器直流侧电压Vdci可由数字化稳压器的低压模组数N和CHB高压模组直流侧电压Udc计算得出,计算公式为: Vdci=Udc/2i
5.根据权利要求4所述的一种基于串联数字化稳压器的中高压电力电子变压器,其特征在于:不串联数字化稳压器的CHB结构,在高压模组数为n的情况下,可调制出2*n+1种电平数量;串联数字化稳压器后的调制电平数m,可由数字化稳压器的低压模组数N和每相的CHB的高压模组数n计算得出,计算公式为:
m=[(n+1)*2N-1]*2+1。
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