CN104767227B - A kind of intelligent distribution network transformation device busbar flow controller - Google Patents
A kind of intelligent distribution network transformation device busbar flow controller Download PDFInfo
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- 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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Abstract
本发明涉及一种智能配电网变电装置母线潮流控制器，所述母线潮流控制器包括基于LCL‑MMC的H‑VSC变换器及L‑VSC变换器和基于MMC及中频隔离的多相型直流变压器；所述H‑VSC换流器交流侧接入高压交流母线，直流侧并联接入高压直流母线；所述L‑VSC换流器交流侧接入高压交流母线，直流侧并联接入高压直流母线；所述直流变压器包括高压侧H‑VSC换流器、低压侧L‑VSC换流器和中频交流变压器组；所述高压侧H‑VSC换流器、交流侧串联中频交流变压器，直流侧串联接高压直流母线。本发明的母线潮流控制器所提供的新型结构，便于不同电压等级交直流混合型电网的互联，并且实现不同额定电压等级交直流母线间有功功率混合协调变换，同时具备高低压交流侧无功解耦控制功能。
The invention relates to a bus flow controller for a substation device of an intelligent distribution network. The bus flow controller includes an LCL-MMC-based H-VSC converter and an L-VSC converter, and a multi-phase type based on MMC and intermediate frequency isolation DC transformer; the AC side of the H-VSC converter is connected to the high-voltage AC bus, and the DC side is connected to the high-voltage DC bus in parallel; the AC side of the L-VSC converter is connected to the high-voltage AC bus, and the DC side is connected to the high-voltage bus in parallel DC busbar; the DC transformer includes a high-voltage side H-VSC converter, a low-voltage side L-VSC converter and an intermediate frequency AC transformer group; the high-voltage side H-VSC converter, the AC side series intermediate frequency AC transformer, DC The high-voltage DC bus is connected in series on the side. The new structure provided by the bus flow controller of the present invention facilitates the interconnection of AC-DC hybrid power grids of different voltage levels, and realizes the mixed and coordinated conversion of active power between AC-DC buses of different rated voltage levels, and at the same time has high and low voltage AC side reactive power solutions. coupling control function.
Description
技术领域technical field
本发明涉及大功率柔性VSC变换和直流变压技术，是一种智能配电网变电装置“母线潮流控制器”。The invention relates to high-power flexible VSC conversion and DC voltage transformation technology, and is a "bus current controller" of an intelligent power distribution network transformation device.
背景技术Background technique
未来配电网将是广泛互联、高度智能、开放互动的“能源互联网”的主要载体，可以实现在广域范围内能源生产、传输、配送、转换、消耗的优化。除了承担电能的配送任务之外，未来配电网还需要实现区域内能源的交换和分配，并满足分布式电源接入及消纳的需求。The future distribution network will be the main carrier of the widely interconnected, highly intelligent, open and interactive "Energy Internet", which can realize the optimization of energy production, transmission, distribution, conversion, and consumption in a wide area. In addition to undertaking the distribution task of electric energy, the future distribution network also needs to realize the exchange and distribution of energy in the region, and meet the needs of distributed power access and consumption.
现有的配电网结构还是依赖于传统上级交流电网进行电力相互传输与调节，而交流电网传输能力取决于系统运行方式，特别是含有高渗透率风电、太阳能发电以及大量电动汽车的局部配电网将很难实现功率柔性调节。相比之下，直流配电网可有效地提高供电容量与电能质量，快速独立地控制有功功率，接入可再生能源灵活、便捷等。因此，未来配电网广泛互联将实现交流配电网、直流配电网及交直流混合配电网的不同电压等级互联，以传统交流为网络支撑通过直流来实现功率柔性调节，来协调大电网与分布式电源之间的矛盾。The existing distribution network structure still relies on the traditional upper-level AC grid for mutual transmission and regulation of power, and the transmission capacity of the AC grid depends on the operation mode of the system, especially the local power distribution with high penetration rate wind power, solar power generation and a large number of electric vehicles Network will be difficult to achieve power flexible regulation. In contrast, DC distribution network can effectively improve power supply capacity and power quality, quickly and independently control active power, and access renewable energy flexibly and conveniently. Therefore, the extensive interconnection of the distribution network in the future will realize the interconnection of different voltage levels of the AC distribution network, the DC distribution network and the AC-DC hybrid distribution network, and use the traditional AC as the network support to realize power flexible regulation through DC to coordinate the large power grid. Contradictions with distributed power.
针对现有技术的不足，本发明提供一种基于多电压等级交直流混合型配电网互联应用的母线潮流控制器(BPFC)。该母线潮流控制器将作为交直流混合型柔性电网互联的关键支撑设备，突破目前传统交流配电网结构，满足了未来交直流混合型智能配电网互联发展需求，同时与通信技术结合起来构造一种全新的多层次交直流混合型配电网架构，实现区域内多层次分布式新能源互联互通。Aiming at the deficiencies of the prior art, the present invention provides a bus flow controller (BPFC) based on multi-voltage level AC-DC hybrid distribution network interconnection application. The bus flow controller will be used as the key supporting equipment for the interconnection of the AC-DC hybrid flexible grid, breaking through the current structure of the traditional AC distribution network, meeting the development needs of the future AC-DC hybrid intelligent distribution network interconnection, and combining with communication technology to construct A new multi-level AC-DC hybrid distribution network architecture realizes the interconnection and intercommunication of multi-level distributed new energy sources in the region.
发明内容Contents of the invention
本发明涉及一种智能配电网变电装置母线潮流控制器。包括基于LCL-MMC的H-VSC变换器及L-VSC变换器和基于MMC及中频隔离的多相型直流变压器；The invention relates to a bus current controller of an intelligent distribution network substation device. Including H-VSC converter and L-VSC converter based on LCL-MMC and multi-phase DC transformer based on MMC and intermediate frequency isolation;
所述H-VSC变换器包括高压侧LCL电路和高压侧VSC变换电路；The H-VSC converter includes a high-voltage side LCL circuit and a high-voltage side VSC conversion circuit;
所述L-VSC变换器包括低压侧LCL电路和低压侧VSC变换电路；The L-VSC converter includes a low-voltage side LCL circuit and a low-voltage side VSC conversion circuit;
所述直流变压器包括高压侧H-VSC变换电路、低压侧L-VSC变换电路和中频交流变压器组；The DC transformer includes a high-voltage side H-VSC conversion circuit, a low-voltage side L-VSC conversion circuit and an intermediate frequency AC transformer group;
所述高压侧VSC变换电路交流侧通过串联高压侧LCL电路后，并联接入高压侧交流母线；所述高压侧VSC变换电路直流侧并联接入高压侧直流母线；The AC side of the high-voltage side VSC conversion circuit is connected in parallel to the high-voltage side AC bus bar after being connected in series with the high-voltage side LCL circuit; the DC side of the high-voltage side VSC conversion circuit is connected in parallel to the high-voltage side DC bus bar;
所述低压侧VSC变换电路交流侧通过串联低压侧LCL电路后，并联接入低压侧交流母线；所述低压侧VSC变换电路直流侧并联接入低压侧直流母线；The AC side of the low-voltage side VSC conversion circuit is connected in parallel to the low-voltage side AC busbar after being connected in series with the low-voltage side LCL circuit; the DC side of the low-voltage side VSC conversion circuit is connected in parallel to the low-voltage side DC busbar;
所述高压侧H-VSC变换电路交流侧串联中频交流变压器组，直流侧串联接高压侧直流母线；The AC side of the high-voltage side H-VSC conversion circuit is connected in series with an intermediate frequency AC transformer group, and the DC side is connected in series with the high-voltage side DC bus;
所述低压侧L-VSC变换电路交流侧串联中频交流变压器组，直流侧串联接低压侧直流母线。The AC side of the low-voltage side L-VSC conversion circuit is connected in series with an intermediate frequency AC transformer group, and the DC side is connected in series with the low-voltage side DC bus.
进一步地，高压侧LCL电路由三相六个电感和三个电容构成，每相由两个电感和一个电容；每相中的两个电感串联，在两个电感中间并联一个电容，三个电容星型连接；每相中两个电感中的一个与高压交流母线三相连接，另一个与高压侧VSC变换电路三相换流装置的上下桥臂中点连接。Furthermore, the high-voltage side LCL circuit is composed of three phases, six inductors and three capacitors, each phase consists of two inductors and one capacitor; two inductors in each phase are connected in series, a capacitor is connected in parallel between the two inductors, and three capacitors Star connection; one of the two inductors in each phase is connected to the three-phase high-voltage AC bus, and the other is connected to the midpoint of the upper and lower bridge arms of the three-phase converter device of the high-voltage side VSC conversion circuit.
进一步地，高压侧VSC变换电路由三相六个桥臂构成，每个桥臂包括一个电抗器和n5个结构相同的子模块；所述n5个结构相同的子模块级联后一端通过电抗器与另一桥臂的电抗器以及所述LCL电路连接，另一端与高压侧直流母线连接；所述三相换流装置整体并联。Further, the high-voltage side VSC conversion circuit is composed of three-phase six bridge arms, each bridge arm includes a reactor and n 5 sub-modules with the same structure; after the n 5 sub-modules with the same structure are cascaded, one end passes through The reactor is connected to the reactor of the other bridge arm and the LCL circuit, and the other end is connected to the high-voltage side DC bus; the three-phase converter device is connected in parallel as a whole.
进一步地，高压侧H-VSC变换电路由n相2n个桥臂构成，每个桥臂包括一个电抗器和n8个结构相同的子模块，每两相4个桥臂为一组，共n/2组；所述n8个结构相同的子模块级联后一端通过电抗器与另一桥臂的电抗器连接以及中频交流变压器组中变压器相连，另一端与高压侧直流母线相连；其中，n为偶数。Furthermore, the H-VSC conversion circuit on the high-voltage side is composed of n-phase 2n bridge arms, each bridge arm includes a reactor and n 8 sub-modules with the same structure, and each two-phase 4 bridge arms form a group, a total of n /2 groups; after the n 8 sub-modules with the same structure are cascaded, one end is connected to the reactor of the other bridge arm through the reactor and the transformer in the intermediate frequency AC transformer group, and the other end is connected to the high-voltage side DC bus; wherein, n is an even number.
进一步地，中频交流变压器组由m个相同的变压器构成，m个变压器并联运行；所述中频交流变压器组中变压器一次侧连接高压侧H-VSC变换电路，二次侧连接低压侧L-VSC变换电路；其中，m＝n/2，n为高压侧H-VSC变换电路的相数。Further, the medium-frequency AC transformer group is composed of m identical transformers, and the m transformers operate in parallel; the primary side of the transformer in the medium-frequency AC transformer group is connected to the high-voltage side H-VSC conversion circuit, and the secondary side is connected to the low-voltage side L-VSC conversion circuit Circuit; wherein, m=n/2, n is the phase number of the high voltage side H-VSC conversion circuit.
进一步地，低压侧L-VSC变换电路，与所述高压侧H-VSC变换电路的结构相同，由n相2n个桥臂构成，每个桥臂包括一个电抗器和n9个结构相同的子模块，每两相4个桥臂为一组，共n/2组；所述n9个结构相同的子模块级联后一端通过电抗器与另一桥臂的电抗器以及与中频交流变压器组中变压器相连，另一端与低压侧直流母线相连；其中，n为偶数。Further, the L-VSC conversion circuit on the low-voltage side has the same structure as the H-VSC conversion circuit on the high-voltage side, and is composed of n-phase 2n bridge arms, and each bridge arm includes a reactor and n9 sub-structures with the same structure. Module, each two-phase 4 bridge arm is a group, a total of n/2 groups; after the n 9 sub-modules with the same structure are cascaded, one end passes through the reactor and the reactor of the other bridge arm and the intermediate frequency AC transformer group The middle transformer is connected, and the other end is connected with the DC bus bar of the low voltage side; wherein, n is an even number.
进一步地，低压侧VSC变换电路与高压侧VSC变换电路结构相同，由三相六个桥臂构成，每个桥臂包括一个电抗器和n7个结构相同的子模块；所述n7个结构相同的子模块级联后一端通过电抗器与另一桥臂的电抗器以及所述低压侧LCL电路连接，另一端与低压侧直流母线连接；所述三相换流装置整体并联。Further, the low-voltage side VSC conversion circuit has the same structure as the high-voltage side VSC conversion circuit, consisting of three-phase six bridge arms, and each bridge arm includes a reactor and n 7 sub-modules with the same structure; the n 7 structures After the same sub-modules are cascaded, one end is connected to the reactor of the other bridge arm and the LCL circuit on the low-voltage side through a reactor, and the other end is connected to the DC bus bar on the low-voltage side; the three-phase converter device is connected in parallel as a whole.
进一步地，低压侧LCL电路结构与高压侧LCL电路结构相同，由三相六个电感和三个电容构成，每相由两个电感和一个电容；每相中的两个电感串联，在两个电感中间并联一个电容，三个电容星型连接；每相中的两个电感中的一个与低压侧交流母线三相连接，另一个与低压侧VSC变换电路三相变换装置的上下桥臂中点连接。Furthermore, the structure of the LCL circuit on the low-voltage side is the same as that of the LCL circuit on the high-voltage side, consisting of six inductors and three capacitors in three phases, and each phase consists of two inductors and one capacitor; A capacitor is connected in parallel in the middle of the inductor, and the three capacitors are connected in a star shape; one of the two inductors in each phase is connected to the three-phase AC bus on the low-voltage side, and the other is connected to the midpoint of the upper and lower bridge arms of the three-phase conversion device of the low-voltage side VSC conversion circuit connect.
进一步地，所述子模块包括半桥型和全桥型；所述半桥型子模块由1个桥臂和1个电容并联构成；所述全桥型子模块由2个桥臂和1个电容并联构成；所述桥臂包括2个串联IGBT模块，每个IGBT模块包括1个IGBT和1个反向并联的二极管。Further, the sub-module includes a half-bridge type and a full-bridge type; the half-bridge type sub-module is composed of 1 bridge arm and 1 capacitor in parallel; the full-bridge type sub-module is composed of 2 bridge arms and 1 Capacitors are connected in parallel; the bridge arm includes two series-connected IGBT modules, and each IGBT module includes one IGBT and one anti-parallel diode.
附图说明Description of drawings
图1是本发明提供的一种智能配电网变电装置母线潮流控制器的基本系统结构图；Fig. 1 is a basic system structure diagram of a smart distribution network substation device bus flow controller provided by the present invention;
图2是本发明提供的一种智能配电网变电装置母线潮流控制器的系统结构电路图；Fig. 2 is a system structure circuit diagram of a bus flow controller of a smart distribution network substation device provided by the present invention;
图3是本发明提供的一种智能配电网变电装置母线潮流控制器中MMC的半桥型子模块结构图；Fig. 3 is a half-bridge type sub-module structural diagram of the MMC in the bus flow controller of a smart distribution network substation device provided by the present invention;
图4是本发明提供的一种智能配电网变电装置母线潮流控制器中MMC的全桥型子模块结构图。Fig. 4 is a structural diagram of a full-bridge sub-module of an MMC in a bus flow controller of a smart distribution network substation device provided by the present invention.
具体实施方式Detailed ways
以下结合附图，对本发明上述的和另外的技术特征和优点作更详细的说明。The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.
参阅图1所示，其为本发明基本系统结构图。包括基于LCL-MMC的H-VSC变换器(1)及L-VSC变换器(2)和基于MMC及中频隔离的多相型直流变压器(3)；H-VSC变换器(1)交流侧接入高压侧交流母线，直流侧并联接入高压侧直流母线；L-VSC变换器(2)交流侧接入低压侧交流母线，直流侧并联接入低压侧直流母线；直流变压器(3)包括高压侧H-VSC变换电路(8)、低压侧L-VSC变换电路(9)和中频交流变压器组(10)；高压侧H-VSC变换电路(8)交流侧串联中频交流变压器组(10)，直流侧并联接高压侧直流母线；低压侧L-VSC变换电路(9)交流侧串联中频交流变压器组(10)，直流侧并联接低压侧直流母线。Referring to Fig. 1, it is a structural diagram of the basic system of the present invention. Including H-VSC converter (1) and L-VSC converter (2) based on LCL-MMC and multi-phase DC transformer (3) based on MMC and intermediate frequency isolation; H-VSC converter (1) AC side connection The AC side of the L-VSC converter (2) is connected to the AC bus of the low-voltage side, and the DC side is connected to the DC bus of the low-voltage side in parallel; the DC transformer (3) includes a high-voltage side H-VSC conversion circuit (8), low-voltage side L-VSC conversion circuit (9) and intermediate frequency AC transformer group (10); The DC side is connected in parallel with the high-voltage side DC busbar; the low-voltage side L-VSC conversion circuit (9) is connected in series with the medium-frequency AC transformer group (10) on the AC side, and the DC side is connected in parallel with the low-voltage side DC busbar.
参阅图2所示，其为本发明系统结构电路图。所述H-VSC变换器(1)、L-VSC变换器(2)、高压侧H-VSC变换电路(8)、低压侧L-VSC变换电路(9)均基于MMC子模块构建，MMC子模块包括半桥型和全桥型。Referring to Fig. 2, it is a circuit diagram of the system structure of the present invention. The H-VSC converter (1), the L-VSC converter (2), the high-voltage side H-VSC conversion circuit (8), and the low-voltage side L-VSC conversion circuit (9) are all constructed based on the MMC sub-module, and the MMC sub-module Modules include half-bridge and full-bridge types.
高压侧LCL电路(4)由三相六个电感和三个电容构成，每相由两个电感和一个电容；每相中的两个电感串联，在两个电感中间并联一个电容，三个电容星型连接；高压侧LCL电路(4)中的电感1、2、3分别与高压交流母线三相连接，电路(4)中的电感4、5、6分别与高压侧MMC-VSC变换电路(5)三相换流装置的上下桥臂中点连接；The high-voltage side LCL circuit (4) is composed of three-phase six inductors and three capacitors, each phase consists of two inductors and one capacitor; two inductors in each phase are connected in series, a capacitor is connected in parallel between the two inductors, and three capacitors star connection; the inductors 1, 2, and 3 in the high-voltage side LCL circuit (4) are respectively connected to the high-voltage AC bus in three phases, and the inductors 4, 5, and 6 in the circuit (4) are respectively connected to the high-voltage side MMC-VSC conversion circuit ( 5) The middle points of the upper and lower bridge arms of the three-phase converter device are connected;
高压侧MMC-VSC变换电路(5)由三相六个桥臂构成，每个桥臂包括一个电抗器和n5个结构相同的子模块；所述n5个结构相同的子模块级联后一端通过电抗器与所述高压侧LCL电路(4)连接；具体的，n5个结构相同的子模块级联后引出端1和2，依次与前后的模块级联，再与一个电抗器串联构成一个桥臂，上下两个桥臂串联，构成1相换流电路，3相换流电路整体并联，并引出高压侧MMC-VSC变换电路(5)与高压侧H-VSC变换电路(8)引出的高压直流母线连接；上下桥臂中点接入高压侧LCL电路(4)中；The high-voltage side MMC-VSC conversion circuit (5) is composed of three-phase six bridge arms, each bridge arm includes a reactor and n 5 sub-modules with the same structure; the n 5 sub-modules with the same structure are cascaded One end is connected to the high-voltage-side LCL circuit (4) through a reactor; specifically, n 5 sub-modules with the same structure are cascaded, and the leads 1 and 2 are cascaded with the front and rear modules in turn, and then connected in series with a reactor A bridge arm is formed, and the upper and lower bridge arms are connected in series to form a 1-phase commutation circuit, and the 3-phase commutation circuit is connected in parallel as a whole, and leads to the high-voltage side MMC-VSC conversion circuit (5) and the high-voltage side H-VSC conversion circuit (8) The lead-out high-voltage DC bus bar is connected; the midpoint of the upper and lower bridge arms is connected to the high-voltage side LCL circuit (4);
高压侧H-VSC变换电路(8)由n(n为偶数)相2n个桥臂构成，每个桥臂包括一个电抗器和n8个结构相同的子模块；把n相电路分为n/2组，每组由两相且有4个桥臂构成，例如第1桥臂与第1’桥臂构成一相，第2桥臂与第2’桥臂构成一相，这两相换流电路并联，并联引出线作为高压侧直流母线，两相构成一组与中频交流变压器组(10)中的第1个变压器连接；高压侧H-VSC变换电路(8)中n/2组的电路连接方式都如上所述。具体的一组中两相，一相为第1桥臂子模块级联后一端通过电抗器与第1’桥臂子模块级联后的电抗器连接再与中频交流变压器组(10)中变压器1的1线相连，这一相另两端与高压侧直流母线相连；另一相为第2桥臂子模块级联后一端通过电抗器与第2’桥臂子模块级联后的电抗器连接再与中频交流变压器组(10)中变压器1中2线相连；这一相另两端与高压侧直流母线相连。n/2组电路连接相同，到第n/2组中两相连接时，一相为第n-1桥臂子模块级联后一端通过电抗器与第(n-1)’桥臂子模块级联后的电抗器连接再与中频交流变压器组(10)中变压器m中n-1线相连，这一相另两端与高压侧直流母线相连；另一相为第n桥臂子模块级联后一端通过电抗器与第n’桥臂子模块级联后的电抗器连接再与高压侧LCL电路(4)中变压器m中n线相连，这一相另两端与高压侧直流母线相连；The high-voltage side H-VSC conversion circuit (8) is composed of n (n is an even number) phase 2n bridge arms, each bridge arm includes a reactor and n 8 sub-modules with the same structure; the n-phase circuit is divided into n/ 2 groups, each group consists of two phases and 4 bridge arms, for example, the 1st bridge arm and the 1' bridge arm constitute a phase, the 2nd bridge arm and the 2' bridge arm constitute a phase, and the two phases commutate The circuits are connected in parallel, and the parallel leads are used as the high-voltage side DC bus, and the two phases form a group to be connected to the first transformer in the intermediate frequency AC transformer group (10); the circuit of n/2 groups in the high-voltage side H-VSC conversion circuit (8) The connections are as above. Specifically, there are two phases in one group, one phase is the first bridge arm sub-module cascaded, and the other end is connected to the reactor in the first bridge arm sub-module cascaded through a reactor, and then connected to the transformer in the intermediate frequency AC transformer group (10) The other two ends of this phase are connected to the high-voltage side DC bus; the other phase is the reactor after the second bridge arm sub-module is cascaded, and one end is cascaded with the 2' bridge arm sub-module through a reactor The connection is connected with the second line of the transformer 1 in the intermediate frequency AC transformer group (10); the other two ends of this phase are connected with the high-voltage side DC bus. The n/2 groups of circuits are connected in the same way. When the two phases in the n/2th group are connected, one phase is cascaded with the n-1th bridge arm sub-module, and the other end is connected to the (n-1)'th bridge arm sub-module through a reactor. The cascaded reactors are connected to the n-1 line in the transformer m in the intermediate frequency AC transformer group (10), and the other two ends of this phase are connected to the high-voltage side DC bus; the other phase is the sub-module level of the nth bridge arm After the connection, one end is connected to the reactor after the cascaded reactor of the n'th bridge arm sub-module through the reactor, and then connected to the n line of the transformer m in the high-voltage side LCL circuit (4), and the other two ends of this phase are connected to the high-voltage side DC bus ;
中频交流变压器组(10)由m个相同的变压器构成，m个变压器并联运行(m＝n/2，n为高压侧H-VSC变换电路(8)的相数)。具体连接为变压器1左端第1条线与高压侧H-VSC变换电路(8)第1桥臂子模块级联后的电抗器和第1’桥臂子模块级联后的电抗器连接，变压器1左端第2条线与高压侧H-VSC变换电路(8)第2桥臂子模块级联后的电抗器和第2’桥臂子模块级联后的电抗器连接；变压器1右端第1’条线与低压侧L-VSC变换电路(9)第1桥臂子模块级联后的电抗器和第1’桥臂子模块级联后的电抗器连接，变压器1右端第2’条线与低压侧L-VSC变换电路(9)第2桥臂子模块级联后的电抗器和第2’桥臂子模块级联后的电抗器连接。M个变压器的连接方式如上所述，变压器m左端第n-1条线与高压侧H-VSC变换电路(8)第n-1桥臂子模块级联后的电抗器和第(n-1)’桥臂子模块级联后的电抗器连接；变压器m左端第n条线与高压侧H-VSC变换电路(8)第n桥臂子模块级联后的电抗器和第n’桥臂子模块级联后的电抗器连接；变压器m右端第(n-1)’条线与低压侧L-VSC变换电路(9)第n-1桥臂子模块级联后的电抗器和第(n-1)’桥臂子模块级联后的电抗器连接；变压器m右端第n条线与低压侧L-VSC变换电路(9)第n桥臂子模块级联后的电抗器和第n’桥臂子模块级联后的电抗器连接；The medium-frequency AC transformer group (10) is composed of m identical transformers, and the m transformers operate in parallel (m=n/2, n is the phase number of the high-voltage side H-VSC conversion circuit (8)). The specific connection is that the first line at the left end of the transformer 1 is connected to the reactor after cascading the first bridge arm sub-module of the high-voltage side H-VSC conversion circuit (8) and the reactor after cascading the first bridge arm sub-module, and the transformer The second line at the left end of 1 is connected to the reactor after the cascaded connection of the sub-modules of the second bridge arm of the high-voltage side H-VSC conversion circuit (8) and the reactor after the cascaded connection of the sub-modules of the second bridge arm; the first line at the right end of the transformer 1 Line 1 is connected to the reactor after the cascaded sub-module of the first bridge arm of the low-voltage side L-VSC conversion circuit (9) and the reactor after the cascaded sub-module of the first bridge arm is connected, and the 2nd line at the right end of transformer 1 The reactor connected in cascade with the sub-module of the second bridge arm of the low-voltage side L-VSC conversion circuit (9) is connected with the reactor connected in cascade of the sub-module of the second bridge arm. The connection method of M transformers is as above, the reactor and the (n-1 )' bridge arm sub-module cascaded reactor connection; the nth line at the left end of the transformer m and the high-voltage side H-VSC conversion circuit (8) the nth bridge arm sub-module cascaded reactor and n' bridge arm Reactor connection after cascading of sub-modules; reactor and ( n-1)' Reactor connection after cascading bridge arm sub-modules; the nth line at the right end of transformer m and the low-voltage side L-VSC conversion circuit (9) Reactor and nth bridge arm sub-module cascading 'The reactor connection after cascading bridge arm sub-modules;
低压侧L-VSC变换电路(9)，与高压侧H-VSC变换电路(8)的结构相同，由n(n为偶数)相2n个桥臂构成，每个桥臂包括一个电抗器和n9个结构相同的子模块；把n相电路分为n/2组，每组为两相且有4个桥臂构成，如第1桥臂与第1’桥臂构成一相，第2桥臂与第2’桥臂构成一相，这两相换流电路并联，并联引出线作为低压侧直流母线，两相构成一组与中频交流变压器组(10)中的第1’个变压器连接；低压侧L-VSC变换电路(9)中n/2组的电路连接方式都如上所述。具体的一组中两相，一相为第1桥臂子模块级联后一端通过电抗器与第1’桥臂子模块级联后的电抗器连接再与中频交流变压器组(10)中变压器1的1’线相连，这一相另两端端与低压侧直流母线相连；另一相为第2桥臂子模块级联后一端通过电抗器与第2’桥臂子模块级联后的电抗器连接再与中频交流变压器组(10)中变压器1中2’线相连；这一相另两端与低压侧直流母线相连。n/2组电路连接相同，到第n/2组连接时，一相为第n-1桥臂子模块级联后一端通过电抗器与第(n-1)’桥臂子模块级联后的电抗器连接再与中频交流变压器组(10)中变压器m中n-1线相连，这一相另两端与低压侧直流母线相连；另一相为第n桥臂子模块级联后一端通过电抗器与第n’桥臂子模块级联后的电抗器连接再与中频交流变压器组(10)中变压器m中n’线相连，这一相另两端与低压侧直流母线相连；The L-VSC conversion circuit (9) on the low-voltage side has the same structure as the H-VSC conversion circuit (8) on the high-voltage side, and is composed of n (n is an even number) phase 2n bridge arms, and each bridge arm includes a reactor and n 9 sub-modules with the same structure; divide the n-phase circuit into n/2 groups, each group is two-phase and consists of 4 bridge arms, such as the first bridge arm and the 1' bridge arm form a phase, and the second bridge arm The arm and the 2' bridge arm form a phase, the two-phase commutation circuits are connected in parallel, and the parallel leads are used as the low-voltage side DC bus, and the two phases form a group to connect with the 1' transformer in the intermediate frequency AC transformer group (10); The circuit connection modes of the n/2 groups in the low-voltage side L-VSC conversion circuit (9) are all as above. Specifically, there are two phases in one group, one phase is the first bridge arm sub-module cascaded, and the other end is connected to the reactor in the first bridge arm sub-module cascaded through a reactor, and then connected to the transformer in the intermediate frequency AC transformer group (10) The other two ends of this phase are connected to the low-voltage side DC bus; the other phase is the cascaded end of the sub-module of the second bridge arm through a reactor and the sub-module of the second arm of the bridge. The reactor is connected to the line 2' of the transformer 1 in the intermediate frequency AC transformer group (10); the other two ends of this phase are connected to the low-voltage side DC bus. The n/2 groups of circuits are connected in the same way. When the n/2th group is connected, one phase is cascaded after the n-1th bridge arm sub-module is cascaded, and the other end is cascaded with the (n-1)'th bridge arm sub-module through a reactor. The reactor is connected to the n-1 line in the transformer m in the intermediate frequency AC transformer group (10), and the other two ends of this phase are connected to the low-voltage side DC bus; the other phase is the end after cascading of the nth bridge arm sub-modules The reactor is connected to the n' line of the transformer m in the intermediate frequency AC transformer group (10) through the reactor after the cascaded reactor of the n'th bridge arm sub-module is connected, and the other two ends of this phase are connected to the low-voltage side DC bus bar;
低压侧VSC变换电路(7)与高压侧VSC变换电路(5)结构相同，由三相六个桥臂构成，每个桥臂包括一个电抗器和n7个结构相同的子模块；所述子模块级联后通过电抗器与所述低压侧LCL电路(6)连接；具体的，子模块的引出端1和2，依次与前后的模块级联，再与一个电抗器串联构成一个桥臂，上下两个桥臂串联，构成1相换流电路，3相换流电路整体并联，并引出低压侧VSC变换电路(7)与低压侧L-VSC变换电路(9)引出的低压直流母线连接。上下桥臂中点接入低压侧LCL电路(6)中；The low-voltage side VSC conversion circuit (7) has the same structure as the high-voltage side VSC conversion circuit (5), and is composed of three-phase six bridge arms, and each bridge arm includes a reactor and n 7 sub-modules with the same structure; After the modules are cascaded, they are connected to the low-voltage-side LCL circuit (6) through a reactor; specifically, the leads 1 and 2 of the sub-modules are sequentially connected to the front and rear modules, and then connected in series with a reactor to form a bridge arm. The upper and lower bridge arms are connected in series to form a 1-phase commutation circuit, and the 3-phase commutation circuit is connected in parallel as a whole, and the low-voltage side VSC conversion circuit (7) is connected to the low-voltage DC bus bar drawn from the low-voltage side L-VSC conversion circuit (9). The middle points of the upper and lower bridge arms are connected to the low-voltage side LCL circuit (6);
低压侧LCL电路(6)结构与高压侧LCL电路(4)结构相同，由三相六个电感和三个电容构成，每相由两个电感和一个电容；每相中的两个电感串联，在两个电感中间并联一个电容，三个电容星型连接；低压侧LCL电路(6)中的电感1、2、3分别与低压交流母线三相连接，低压侧LCL电路(6)中的电感4、5、6分别与换流器(7)三相换流电路的上下桥臂中点连接。The structure of the LCL circuit (6) on the low-voltage side is the same as that of the LCL circuit (4) on the high-voltage side. It is composed of six inductors and three capacitors in three phases, and each phase is composed of two inductors and one capacitor; two inductors in each phase are connected in series, A capacitor is connected in parallel between the two inductors, and the three capacitors are star-connected; the inductors 1, 2, and 3 in the low-voltage side LCL circuit (6) are respectively connected to the low-voltage AC bus in three phases, and the inductors in the low-voltage side LCL circuit (6) 4, 5, 6 are respectively connected to the middle points of the upper and lower bridge arms of the three-phase commutation circuit of the converter (7).
参阅图3所示，其为本发明MMC的半桥型子模块结构图。其中半桥型子模块由1个桥臂和1个电容并联构成；桥臂包括2个串联IGBT模块；每个IGBT模块包括1个IGBT和1个反向并联的二极管；桥臂中点引出端1，下IGBT发射极引出端2。Referring to FIG. 3 , it is a structural diagram of a half-bridge sub-module of the MMC of the present invention. The half-bridge sub-module is composed of a bridge arm and a capacitor connected in parallel; the bridge arm includes 2 series IGBT modules; each IGBT module includes 1 IGBT and 1 anti-parallel diode; the midpoint terminal of the bridge arm 1, the lower IGBT emitter terminal 2.
参阅图4所示，其为本发明MMC的全桥型子模块结构图。其中全桥型子模块由2个桥臂和1个电容并联构成；每个桥臂包括2个串联IGBT模块；每个IGBT模块包括1个IGBT和1个反向并联的二极管；两桥臂中点分别引出端1和端2。Referring to FIG. 4 , it is a structural diagram of a full-bridge sub-module of the MMC of the present invention. The full bridge sub-module is composed of 2 bridge arms and 1 capacitor connected in parallel; each bridge arm includes 2 series IGBT modules; each IGBT module includes 1 IGBT and 1 antiparallel diode; Points lead to terminal 1 and terminal 2 respectively.
以上所述仅为本发明的较佳实施例，对发明而言仅仅是说明性的，而非限制性的。本专业技术人员理解，在发明权利要求所限定的精神和范围内可对其进行许多改变，修改，甚至等效，但都将落入本发明的保护范围内。The above descriptions are only preferred embodiments of the present invention, and are only illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the invention, but all will fall within the protection scope of the present invention.
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