CN104601003A - 一种基于模块化多电平变换器的电力电子变压器 - Google Patents

一种基于模块化多电平变换器的电力电子变压器 Download PDF

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CN104601003A
CN104601003A CN201510005623.2A CN201510005623A CN104601003A CN 104601003 A CN104601003 A CN 104601003A CN 201510005623 A CN201510005623 A CN 201510005623A CN 104601003 A CN104601003 A CN 104601003A
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transformer
voltage
low
mmc
modular multilevel
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梅军
郑建勇
吉宇
杜晓舟
马天
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Southeast University
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Southeast University
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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
    • 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
    • H02M3/3353Conversion 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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements

Abstract

本发明公开了一种基于模块化多电平变换器的电力电子变压器,主要包括模块化多电平拓扑(MMC)整流电路、DC/DC变压器、低压逆变电路。高压交流电网通过模块化多电平拓扑或混合式模块化多电平拓扑整流电路从而得到高压直流母线,再经过DC/DC变压器得到低压直流母线,最后经过低压逆变电路得到低压工频交流电。同理,系统也可以实现低压交流电源向高压交流电网供电的过程,可以灵活地实现潮流的双向流动。本发明实现了将一种电力特征的电能转变为另一种电力特征的电能的新型智能变压器。整个电力电子变压器具有体积小、重量轻、环境污染小、控制灵活、可靠性高等优点。

Description

—种基于模块化多电平变换器的电力电子变压器
技术领域
[0001] 本发明属于电力电子在电力系统中应用的技术领域,具体涉及一种基于模块化多电平变换器的电力电子变压器。
背景技术
[0002] 电子电力变压器(Electronic Power Transformer, EPT)又被称为电力电子变压器(Power Electronic Transformer, PET)或固态变压器(Solid State Transformer,SST),其是一种将电力电子变换技术和基于电磁感应原理的电能变换技术相结合,实现将一种电力特征的电能转变为另一种电力特征的电能的新型智能变压器。相对于传统变压器而言,电力电子变压器具有如下优点:(I)体积小,重量轻,环境污染小;(2)运行时二次侧输出电压幅值恒定,不随负载变化,且平滑可调;(3) —次、二次侧电压为正弦波形,功率因数可调;(4) 一次、二次侧电压、电流和功率均高度可控;(5)本身具有断路器的功能,无需传统的变压器继电保护装置。电力电子变压器是集电力电子、电力系统、计算机、数字信号处理以及自动控制理论等领域为一体的电力系统前沿研究课题,也是解决电能质量问题,建设“绿色电网”、“数字电网”的可行途径之一。目前在国内外,关于电力电子变压器有很多相关的研究和开发。
[0003] 模块化多电平变换器(Modular Multilevel Converter, MMC)是一种适用于中高压应用场合的新型变换器。这种结构具有很大的优势,与目前主要的二极管钳位型、飞跨电容型多电平拓扑相比,MMC具有损耗小、冗余性好、开关频率低、输出谐波少等特点。与级联H桥多电平拓扑相比,MMC具有公用直流母线以及良好的四象限工作性能等特点。MMC的每个子模块结构相对简单,控制容易,可以无限扩展,特别适用于高压大容量领域。将MMC取代级联H桥作为PET的高压侧变换器得到高压直流母线。中间的DC-DC变换器则实现高压侧和低压侧隔离功能。这种基于MMC的PET具有如下的特点和优势:1)为三相结构,可提高直流输出电压质量。2)可以显著减少高频变压器的用量。3)可以减少电力电子开关器件的用量。
发明内容
[0004] 本发明的目的是克服目前电力电子变压器的不足,采用MMC拓扑取代传统的VSC拓扑作为高电压电网的接口,有效地增强了系统的可靠性。由于MMC的四象限运行特点,该电力电子变压器可以实现双向潮流流动,且控制简单、鲁棒性强。
[0005] 本发明的技术方案:在高压交流电网的电能传输中采用背靠背的MMC拓扑结构,其中MMC整流电路采用的是工频调制,而DC/DC变压器中的MMC逆变电路则采用中频调制,这样产生了高压中频交流电,有效地降低了变压器的体积和重量。当然,为了减少系统THD,这两块电路的主拓扑也可以采用全半桥混合的新型MMC拓扑。
[0006] 低压工频整流电路具有不控整流、VSC全桥整流这两种拓扑结构,前者的潮流是单向的,即从高压侧到电压侧。后者的潮流则是双向的,可以满足新能源接入等要求。
[0007] 本发明的优点在于:1)基于MMC的电力电子变压器为三相结构,可提高直流输出电压质量、显著减少中频变压器的体积和重量、减少电力电子开关器件的用量。
[0008] 2)基于MMC的电力电子变压器中存在高低压直流母线、高低压交流母线,为交直流新能源的接入提供了接口。
附图说明
[0009] 图1是本发明的系统连接原理框图。
[0010] 图2(a)是本发明中基于MMC的高压整流电路原理图。
[0011] 图2(b)是本发明中基于全半桥混合式MMC的高压整流电路原理图。
[0012] 图3(a)是本发明中基于MMC逆变电路和不控整流电路的DC/DC变压器原理图。
[0013] 图3(b)是本发明中基于MMC逆变电路和可控整流电路的DC/DC变压器原理图。
[0014] 图3(c)是本发明中基于全半桥混合式MMC逆变电路和不控整流电路的DC/DC变压器原理图。
[0015] 图3(d)是本发明中基于全半桥混合式MMC逆变电路和可控整流电路的DC/DC变压器原理图。
[0016] 图4是本发明的低压逆变器电路原理图。
具体实施方式
[0017] 下面结合附图与实施例对本发明的技术方案作进一步的具体说明。
[0018] 如图1所示,本发明电力电子变压器由换流变压器高压MMC整流电路(I)、DC/DC变压器(2)、低压逆变电路(3)组成;3部分电路依次连接,有效地构成了基于MMC的电力电子变压器。
[0019] 如图2(a) ,2(b)所示,本发明采用MMC或全桥半桥混合式MMC的高压整流电路,可以有效地将高压交流电转变为高压直流电。
[0020] 如图3(a)、3(b)、3(c)、3(d)所示,本发明中的DC/DC变压器中的中频逆变电路可以采用MMC逆变电路或全桥半桥混合式MMC,从而将高压直流电转变为高压中频交流电。高压中频交流电通过中频变压器连接低压中频交流电。低压整流电路可以采用不控整流电路或可控整流电路,从而将低压中频交流电转变为低压直流电。
[0021] 其中,低压整流电路采用可控整流电路时,潮流可以反向流动,适用于新能源接入。
[0022] 如图4所示,低压逆变电路采用VSC的拓扑结构,有效地降低了开关管数量,其输出直接并入配电网或接交流负载。
[0023] 上述实例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人是能够了解本发明的内容并据以实施,并不能以此限制本发明的保护范围。凡根据本发明精神实质所做的等效变换或修饰,都应涵盖在本发明的保护范围之内。

Claims (6)

1.一种基于模块化多电平变换器的电力电子变压器,其特征在于该电力电子变压器包括:高压MMC整流电路(I)、DC/DC变压器(2)、低压逆变电路(3);其中,高压交流电网通过高压MMC整流电路(I)得到高压直流母线,高压直流母线经过DC/DC变压器(2)得到低压直流母线,低压直流母线经过低压逆变电路(3 )得到低压交流母线,低压交流母线直接和配电网/负载相连,从而传输电能。
2.根据权利要求1所述的一种基于模块化多电平变换器的电力电子变压器,其特征在于高压MMC整流电路(I)和DC/DC变压器(2)中的高压逆变电路部分都采用了 MMC拓扑结构或全半桥混合式MMC结构,这些拓扑可以通过子模块的扩展达到高电压、大容量,其中,DC/DC变压器(2)中的变压器采用中频变压器。
3.根据权利要求1所述的一种基于模块化多电平变换器的电力电子变压器,其特征在于DC/DC变压器(2)中包括MMC逆变电路、中频变压器、低压整流电路。
4.根据权利要求3所述的一种基于模块化多电平变换器的电力电子变压器,其特征在于DC/DC变压器(2 )中的MMC逆变电路是单相的,且采用中频调制。
5.根据权利要求3所述的一种基于模块化多电平变换器的电力电子变压器,其特征在于DC/DC变压器(2)中的低压整流电路部分采用不控整流电路或全控VSC高频整流电路,当该整流电路为全控整流电路时,该电力电子变压器可以实现潮流的双向流动,能够将新能源并入高压电网。
6.根据权利要求1所述的一种基于模块化多电平变换器的电力电子变压器,其特征在于DC/DC变压器(2)中存在低压直流母线,同时低压逆变电路(3)中存在低压交流母线。
CN201510005623.2A 2015-01-06 2015-01-06 一种基于模块化多电平变换器的电力电子变压器 Pending CN104601003A (zh)

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Cited By (6)

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CN105207504A (zh) * 2015-10-09 2015-12-30 中国南方电网有限责任公司超高压输电公司检修试验中心 一种具有增强电压特性半桥全桥混合型的mmc拓扑
CN105515401A (zh) * 2015-11-30 2016-04-20 武汉大学 一种模块化多电平结构的固态变压器
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GB2557698A (en) * 2016-12-13 2018-06-27 Isotek Oil And Gas Ltd A subsea DC to DC voltage converter
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Cited By (7)

* Cited by examiner, † Cited by third party
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CN105207504A (zh) * 2015-10-09 2015-12-30 中国南方电网有限责任公司超高压输电公司检修试验中心 一种具有增强电压特性半桥全桥混合型的mmc拓扑
CN105207504B (zh) * 2015-10-09 2018-02-23 中国南方电网有限责任公司超高压输电公司检修试验中心 一种具有增强电压特性半桥全桥混合型的mmc拓扑
CN105515401A (zh) * 2015-11-30 2016-04-20 武汉大学 一种模块化多电平结构的固态变压器
CN106998152A (zh) * 2016-01-25 2017-08-01 华北电力大学 无需均压控制的电气隔离单向dc-dc变换器
GB2557698A (en) * 2016-12-13 2018-06-27 Isotek Oil And Gas Ltd A subsea DC to DC voltage converter
CN106602885B (zh) * 2017-03-03 2019-01-04 哈尔滨工业大学 模块化多电平换流器四象限变频器
US10797612B2 (en) 2017-08-01 2020-10-06 Ge Aviation Systems Llc Power distribution network

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Application publication date: 20150506