CN111293868B - 一种固态变压器及其控制方法 - Google Patents
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- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion 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
- H02M3/325—Conversion 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
- H02M3/335—Conversion 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
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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- H02M7/537—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 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
- H02M7/5387—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 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
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Abstract
本发明提供一种固态变压器及其控制方法,所述固态变压器包括功率交换通路、整流电路、三个DC/DC电路和DC/AC电路;在输入级(整流电路)之前设置了功率交换通路,由于功率交换通路对高频电压呈低阻抗特性,对基频电压呈高阻抗特性,整流电路的三个AC/DC电路可以通过功率交换通路进行能量交换,以达到平衡直流侧电容电压的目的。
Description
技术领域
本发明涉及直流输配电技术领域,特别是涉及一种固态变压器及其控制方法。
背景技术
近年来,交流输电的损耗越来越大,不易于电网互联等问题越来越突出。因此,直流输配电技术重新受到各国重视,世界各地加快了直流输电、配电网络的建设。而在直流电网中,固态变压器被广泛使用,其除了可以直接进行DC/DC变换外,还具有双向调节、高度可控和易模块化拓展等优点。但是在实际应用中,固态变压器的各相输入级直流侧电容电压受到不平衡负载和损耗功率不同等影响,导致其直流侧电容电压出现大范围波动现象,影响装置正常运行。
发明内容
本发明的目的是提供一种固态变压器及其控制方法,以实现输入级直流侧电压平衡控制,解决固态变压器输入级直流侧电容电压不稳定的问题。
为实现上述目的,本发明提供了如下方案:
一种固态变压器,所述固态变压器包括功率交换通路、整流电路、三个DC/DC电路和DC/AC电路;
所述整流电路的输入端与交流电源连接,所述功率交换通路并联在所述整流电路的输入端;所述整流电路包括三个AC/DC电路,三个所述AC/DC电路的输入端相互串联;三个AC/DC电路的输出端分别与三个所述DC/DC电路的输入端一一对应的连接;三个所述DC/DC电路的输出端并联后与所述DC/AC电路的输入端连接。
可选的,所述功率交换通路包括依次串联的电感L2、电容C2和电阻R2。
可选的,所述固态变压器还包括电容Ca1、电容Ca2和电容Ca3,电容Ca1、电容Ca2和电容Ca3分别并联在三个所述AC/DC电路的输出端。
可选的,所述DC/DC电路包括逆变器、变压器和整流器;
所述逆变器的输出端与所述变压器的输入端连接,所述变压器的输出端与所述整流器的输入端连接。
可选的,所述固态变压器还包括电容Cb1、电容Cb2和电容Cb3,电容Cb1、电容Cb2和电容Cb3分别并联在三个所述DC/DC电路的整流器的输出端。
可选的,所述固态变压器还包括电感L和输入端滤波电路;所述输入端滤波电路包括电容C1、电阻R1和电感L1;电容C1和电阻R1串联后并联在交流电源的两个输出端之间;
所述电感L串联在交流电源与电容C1和电阻R1串联电路之间的交流线路上,所述电感L1串联在电容C1和电阻R1串联电路与功率交换通路之间的交流线路上。
可选的,所述固态变压器还包括输出端滤波电路,所述输出端滤波电路连接在所述DC/AC电路的输出端;所述输出端滤波电路为由电感L2和电容Cc1组成的LC滤波电路。
一种固态变压器的控制方法,其特征在于,所述控制方法包括如下步骤:
对有功电压ud和无功电压uq进行dq/abc变换得到工频调制电压;
将工频调制电压与高频调制电压相加,根据相加得到的结果进行脉冲调制,得到整流电路的三个AC/DC电路的各开关管的触发脉冲。
根据本发明提供的具体实施例,本发明公开了以下技术效果:
本发明提供一种固态变压器及其控制方法,所述固态变压器包括功率交换通路、整流电路、三个DC/DC电路和DC/AC电路;在输入级(整流电路)之前设置了功率交换通路,由于功率交换通路对高频电压呈低阻抗特性,对基频电压呈高阻抗特性,整流电路的三个AC/DC电路可以通过功率交换通路进行能量交换,以达到平衡直流侧电容电压的目的。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。
图1为本发明提供的一种固态变压器的电路拓扑结构示意图;
图2为本发明提供的半桥整流逆变器的拓扑结构图;
图3为本发明提供的全桥整流逆变器的拓扑结构图;
图4为本发明提供的一种固态变压器的控制方法的原理示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明的目的是提供一种固态变压器及其控制方法,以实现输入级直流侧电压平衡控制,解决固态变压器输入级直流侧电容电压不稳定的问题。
为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合附图和具体实施方式对本发明作进一步详细的说明。
为实现上述目的,本发明提供了如下方案:
本发明提供一种固态变压器,如图1所示,所述固态变压器包括功率交换通路、整流电路、三个DC/DC电路和DC/AC电路;所述整流电路的输入端与交流电源连接,所述功率交换通路并联在所述整流电路的输入端;所述整流电路包括三个AC/DC电路,三个所述AC/DC电路的输入端相互串联;三个AC/DC电路的输出端分别与三个所述DC/DC电路的输入端一一对应的连接;三个所述DC/DC电路的输出端并联后与所述DC/AC电路的输入端连接。所述功率交换通路包括依次串联的电感L2、电容C2和电阻R2。本发明在输入级(整流电路)之前设置了功率交换通路,由于功率交换通路对高频电压呈低阻抗特性,对基频电压呈高阻抗特性,整流电路的三个AC/DC电路可以通过功率交换通路进行能量交换,以达到平衡直流侧电容电压的目的。
本发明的AC/DC电路为半桥整流逆变器或全桥整流逆变器,如图2所示为半桥整流逆变器。开关管S1的集电极与电容(Ca1、Ca2或Ca3)的正极连接;开关管S1的发射极与半桥模块的输入端的正极以及开关管S2的集电极连接;开关管S2的发射极与半桥模块的输入端的负极以及电容的负极连接。开关管S1和开关管S2为电力场效应管、电力晶体管或绝缘栅双极晶体管的半导体开关管。
如图3所示为全桥整流逆变器。开关管S1的集电极和开关管S3的集电极以及电容(Ca1、Ca2或Ca3)的正极连接;开关管S1的发射极和开关管S2的集电极以及全桥模块的输入端连接;开关管S2的发射极与开关管S4的发射极以及电容的负极相连;开关管S3的发射极与开关管S4的集电极以及全桥模块的输出端连接。开关管为电力场效应管、电力晶体管或绝缘栅双极晶体管的半导体开关管。
作为一种优选的实施方式但不限于此实施方式,所述固态变压器还包括电容Ca1、电容Ca2和电容Ca3,电容Ca1、电容Ca2和电容Ca3分别并联在三个所述AC/DC电路的输出端。所述DC/DC电路包括逆变器、变压器和整流器;所述逆变器的输出端与所述变压器的输入端连接,所述变压器的输出端与所述整流器的输入端连接。所述固态变压器还包括电容Cb1、电容Cb2和电容Cb3,电容Cb1、电容Cb2和电容Cb3分别并联在三个所述DC/DC电路的整流器的输出端。
作为一种优选的实施方式但不限于此实施方式,所述固态变压器还包括电感L和输入端滤波电路;所述输入端滤波电路包括电容C1、电阻R1和电感L1;电容C1和电阻R1串联后并联在交流电源的两个输出端之间;所述电感L串联在交流电源与电容C1和电阻R1串联电路之间的交流线路上,所述电感L1串联在电容C1和电阻R1串联电路与功率交换通路之间的交流线路上。所述固态变压器还包括输出端滤波电路,所述输出端滤波电路连接在所述DC/AC电路的输出端;所述输出端滤波电路为由电感L2和电容Cc1组成的LC滤波电路。
如图4所示,本发明还提供一种固态变压器的控制方法,所述控制方法包括如下步骤:
对有功电压ud和无功电压uq进行dq/abc变换得到工频调制电压ua、ub和uc;
将工频调制电压ua、ub和uc与高频调制电压uA、uB和uC相加,根据相加得到的结果进行脉冲调制,得到整流电路的三个AC/DC电路的各开关管的触发脉冲,使整流电路完成整流功能的同时能够稳定其直流侧电容电压。
根据本发明提供的具体实施例,本发明公开了以下技术效果:
本发明提供一种固态变压器及其控制方法,所述固态变压器包括功率交换通路、整流电路、三个DC/DC电路和DC/AC电路;在输入级(整流电路)之前设置了功率交换通路,由于功率交换通路对高频电压呈低阻抗特性,对基频电压呈高阻抗特性,整流电路的三个AC/DC电路可以通过功率交换通路进行能量交换,以达到平衡直流侧电容电压的目的。
本说明书中各个实施例采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似部分互相参见即可。
本文中应用了具体个例对本发明的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其核心思想;同时,对于本领域的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改变之处。综上所述,本说明书内容不应理解为对本发明的限制。
Claims (7)
1.一种固态变压器的控制方法,其特征在于,所述控制方法用于控制固态变压器,所述固态变压器包括功率交换通路、整流电路、三个DC/DC电路和DC/AC电路;所述整流电路的输入端与交流电源连接,所述功率交换通路并联在所述整流电路的输入端;所述整流电路包括三个AC/DC电路,三个所述AC/DC电路的输入端相互串联;三个AC/DC电路的输出端分别与三个所述DC/DC电路的输入端一一对应的连接;三个所述DC/DC电路的输出端并联后与所述DC/AC电路的输入端连接;
所述控制方法包括如下步骤:
对有功电压ud和无功电压uq进行dq/abc变换得到工频调制电压;
将工频调制电压与高频调制电压相加,根据相加得到的结果进行脉冲调制,得到整流电路的三个AC/DC电路的各开关管的触发脉冲。
2.根据权利要求1所述的固态变压器的控制方法,其特征在于,所述功率交换通路包括依次串联的电感L2、电容C2和电阻R2。
3.根据权利要求1所述的固态变压器的控制方法,其特征在于,所述固态变压器还包括电容Ca1、电容Ca2和电容Ca3,电容Ca1、电容Ca2和电容Ca3分别并联在三个所述AC/DC电路的输出端。
4.根据权利要求1所述的固态变压器的控制方法,其特征在于,所述DC/DC电路包括逆变器、变压器和整流器;
所述逆变器的输出端与所述变压器的输入端连接,所述变压器的输出端与所述整流器的输入端连接。
5.根据权利要求1或4所述的固态变压器的控制方法,其特征在于,所述固态变压器还包括电容Cb1、电容Cb2和电容Cb3,电容Cb1、电容Cb2和电容Cb3分别并联在三个所述DC/DC电路的整流器的输出端。
6.根据权利要求1所述的固态变压器的控制方法,其特征在于,所述固态变压器还包括电感L和输入端滤波电路;所述输入端滤波电路包括电容C1、电阻R1和电感L1;电容C1和电阻R1串联后并联在交流电源的两个输出端之间;
所述电感L串联在交流电源与电容C1和电阻R1串联电路之间的交流线路上,所述电感L1串联在电容C1和电阻R1串联电路与功率交换通路之间的交流线路上。
7.根据权利要求1所述的固态变压器的控制方法,其特征在于,所述固态变压器还包括输出端滤波电路,所述输出端滤波电路连接在所述DC/AC电路的输出端;所述输出端滤波电路为由电感L2和电容Cc1组成的LC滤波电路。
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