CN108521137B - Hybrid layered direct-current power transmission system and method - Google Patents
Hybrid layered direct-current power transmission system and method Download PDFInfo
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- CN108521137B CN108521137B CN201810385220.9A CN201810385220A CN108521137B CN 108521137 B CN108521137 B CN 108521137B CN 201810385220 A CN201810385220 A CN 201810385220A CN 108521137 B CN108521137 B CN 108521137B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention relates to a hybrid layered direct current transmission system and a method, which comprises a rectifying side and an inverting side, wherein the inverting side is connected with the rectifying side through a direct current line with at least two voltage levels; the rectifying side comprises N converter station units, the converter station units are connected in series to form a converter station unit group, and the converter station unit group comprises a 1 st converter station unit, a 2 nd converter station unit connected in series with the 1 st converter station unit, and a 3 rd converter station unit connected in series with the 2 nd converter station unit till the Nth converter station unit; a plurality of converter station unit groups are arranged in the inversion side; and the N converter station units at the rectification side respectively correspond to the M inversion sides through the M direct-current lines. The invention can increase the delivery efficiency of the high-capacity delivery end, is beneficial to saving the capital investment and effectively utilizing the converter station unit.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution of a power system, in particular to a hybrid layered direct-current power transmission system and a method.
Background
According to the concept of the overall planning of three networking projects of Mongolia-middle, middle-Korean and Korean-day, in order to reduce the influence on a transit power grid as much as possible, a multi-terminal mixed direct current mode is adopted to realize a sending terminal (Mongolia) and three receiving terminals.
At present, the access mode of direct current transmission adopts a conventional mode of transmitting electric energy to another station through a transmission line according to the highest level of line voltage, and electric energy is not led out and transmitted to another station through the transmission line between converter components.
However, such conventional wiring may result in duplication of the converter station or inefficient utilization of the converter station units.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a hybrid layered dc transmission system and method that not only reduces the duplication of converter stations, but also improves the effective utilization of converter components.
In order to achieve the purpose, the invention adopts the following technical scheme: a hybrid stratified dc power transmission system, comprising: the system comprises a rectifying side and an inverter side, wherein the inverter side is connected with the rectifying side through a direct current line with at least two voltage levels; the rectifying side comprises N converter station units, and the converter station units are sequentially connected in series to form a converter station unit group; a plurality of converter station unit groups are arranged in the inversion side; the N converter station units on the rectifying side respectively correspond to the M inverter sides through M direct-current lines; wherein N > -2 and N > -M > -2.
Further, the voltage grades of the direct current lines are M.
Furthermore, the converter station units respectively comprise a converter bus, a converter transformer and a converter which are sequentially connected in series; each converter is connected with one converter transformer.
Further, the converter station units are connected in parallel in one or more.
Further, the converter adopts a power grid commutation converter LCC or a voltage source converter VSC.
Further, the system is a single-pole structure hybrid layered direct current transmission system or a double-pole structure hybrid layered direct current transmission system.
Further, the hybrid layered direct-current transmission system is a hybrid layered direct-current transmission system with a single-pole structure, and 1 rectifying side of the system comprises R converter station units, S inversion sides and S direct-current lines with voltage levels; one end of the 1 st converter station unit on the rectifying side is grounded or connected with a metal return wire, the other end of the 1 st converter station unit on the rectifying side is connected with one end of the 2 nd converter station unit on the rectifying side, and is connected or not connected with one end of the 1 st converter station unit group in the inverting side through the direct current line, if so, the other end of the 1 st converter station unit group in the inverting side is grounded or connected with a metal return wire; the x-th converter station unit on the rectifying side is connected with one end of the x + 1-th converter station unit on the rectifying side, the other end of the x-th converter station unit on the rectifying side is connected or not connected with one end of the y-th converter station unit group in the inverting side through the direct current line, and if the x-th converter station unit on the rectifying side is connected with the y-th converter station unit group in the inverting side, the other end of the y-th converter station unit group in the inverting side is grounded or connected with a metal return wire; the other end of the R-th converter station unit on the rectifying side is connected with one end of the S-th inner converter station unit group on the inverting side through the direct current line, and the other end of the S-th inner converter station unit group on the inverting side is grounded or connected with a metal return wire; wherein, R-1 ═ x ═ 2, and S-1 ═ y ═ 1.
Further, the hybrid layered direct-current power transmission system is a bipolar structure hybrid layered direct-current power transmission system, and 1 rectifying side of the system comprises 2K converter station units, L inverting sides and L direct-current lines with positive and negative symmetrical voltage levels; the K-th converter station unit on the rectifying side is grounded with a neutral point of the K + 1-th converter station unit on the rectifying side, the other end of the K-th converter station unit on the rectifying side is connected with one end of the K-1-th converter station unit on the rectifying side, and is connected with one end of the 1 st internal converter station unit group on the inverting side through the direct current line, the other end of the K + 1-th converter station unit on the rectifying side is connected with one end of the K + 2-th converter station unit on the rectifying side, and is connected with the other end of the 1 st internal converter station unit group on the inverting side through the direct current line, both ends of the 1 st internal converter station unit group on the inverting side are connected with the direct current line, and then the neutral point of the 1 st internal converter station unit group on the inverting side is grounded; the other end of the xth converter station unit on the rectifying side is connected with one end of the xth-1 converter station unit on the rectifying side, and is connected with one end of the unit group of the converter stations in the inversion side through the direct current line, the other end of the 2K + 1-xth converter station unit on the rectifying side is connected with one end of the 2K + 2-xth converter station unit on the rectifying side, and is connected with the other end of the unit group of the converter stations in the inversion side through the direct current line, and both ends of the unit group of the converter stations in the inversion side are connected with the direct current line, so that the neutral point of the unit group of the converter stations in the inversion side is grounded; the other end of the 1 st converter station unit on the rectifying side is connected with one end of the L-th inversion side inner converter station unit group through the direct current line, the other end of the 2K-th converter station unit on the rectifying side is connected with the other end of the L-th inversion side inner converter station unit group through the direct current line, and the other end of the L-th inversion side inner converter station unit group is grounded or connected with a metal return wire; wherein, K-1 ═ x > -2, and L-1 ═ y ═ 1.
A method for realizing a hybrid layered direct current transmission system is characterized by comprising the following steps:
a step of setting a rectification side and a step of setting an inversion side connected with the rectification side through a direct current line with no less than two voltage levels;
the rectifying side setting step comprises the step of setting N converter station units, wherein the converter station units are sequentially connected in series to form a converter station unit group;
arranging a plurality of converter station unit groups in an inversion side;
the N converter station units on the rectifying side respectively correspond to the M inverter sides through M direct-current lines; wherein N > -2 and N > -M > -2.
Further, a step of sequentially connecting a converter bus, a converter transformer and a converter in series to form the converter station unit is provided; each converter is connected with one converter transformer.
Due to the adoption of the technical scheme, the invention has the following advantages: the invention provides a hybrid layered direct current transmission system which can increase the delivery efficiency of a high-capacity delivery end on one hand, and is beneficial to saving capital investment and effectively utilizing converter station units on the other hand.
Drawings
Fig. 1 is a schematic view of a converter station unit structure according to the invention; wherein, fig. 1a is a power grid commutation converter LCC, and fig. 1b is a voltage source converter VSC;
fig. 2 is a schematic structural diagram of a monopole structure hybrid layered dc power transmission system in an embodiment of the present invention, where R is 2 and S is 2;
fig. 3 is a schematic structural diagram of a bipolar-structured hybrid-layered dc power transmission system in an embodiment of the present invention, where K is 2 and L is 2.
Detailed Description
In describing the present invention, it should be understood that the terms "system" and "network" are often used interchangeably herein. The terms "upper", "lower", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In the present invention, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship.
Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The invention provides a hybrid layered direct current transmission system which comprises a rectifying side and an inverting side, wherein the inverting side is connected with the rectifying side through a direct current line with at least two voltage levels. The rectifying side comprises N converter station units (N > -2), the converter station units form a converter station unit group through serial connection, and the converter station unit group comprises a 1 st converter station unit, a 2 nd converter station unit connected with the 1 st converter station unit in series, a 3 rd converter station unit connected with the 2 nd converter station unit in series, and an Nth converter station unit connected with the N-1 st converter station unit in series. A plurality of converter station unit groups are arranged in the inversion side, and the number of converter station units in the converter station unit groups is not limited; theoretically, N converter station units on the rectifying side can respectively correspond to M inverting sides (N > -M > -2) through M direct current lines; the voltage class of the direct current line is M. The converter station units comprise a power grid commutation converter LCC or a voltage source converter VSC, converter transformers and alternating current buses, the converter transformers and the converters are sequentially connected in series, and each converter is connected with one converter transformer. The converter station units are connected in parallel by one or more.
The hybrid layered direct-current power transmission system is a monopole structure hybrid layered direct-current power transmission system or a bipolar structure hybrid layered direct-current power transmission system.
If the hybrid hierarchical direct current transmission system is a single-pole structure hybrid hierarchical direct current transmission system, 1 rectification side of the hybrid hierarchical direct current transmission system comprises R converter station units, S inversion sides and S voltage-level direct current lines. One end of the 1 st converter station unit at the rectifying side is grounded or connected with a metal return wire, and the other end of the 1 st converter station unit at the rectifying side is connected with one end of the 2 nd converter station unit at the rectifying side and is connected or not connected with one end of a converter station unit group in the 1 st inversion side through a direct current line; and if the inversion side is connected, the other end of the 1 st inversion side inner converter station unit group is grounded or connected with a metal return wire. The x-th converter station unit (R-1> ═ x > ═ 2) on the rectifying side is connected with one end of the x + 1-th converter station unit on the rectifying side, the other end of the x-th converter station unit on the rectifying side is connected or not connected with one end of the y-th inversion side (S-1> ═ y > ═ 1) inner converter station unit group through a direct current line, and if the connection is carried out, the other end of the y-th inversion side inner converter station unit group is grounded or connected with a metal return wire. The other end of the R-th converter station unit on the rectifying side is connected with one end of the S-th inversion side inner converter station unit group through a direct current line, and the other end of the S-th inversion side inner converter station unit group is grounded or connected with a metal return wire.
If the hybrid hierarchical direct-current transmission system is a bipolar structure hybrid hierarchical direct-current transmission system, 1 rectification side of the hybrid hierarchical direct-current transmission system comprises 2K converter station units, L inversion sides and L direct-current lines with positive and negative symmetrical voltage levels. The neutral point of the Kth converter station unit at the rectification side and the neutral point of the Kth +1 th converter station unit at the rectification side are grounded or connected with a metal return wire, and the other end of the Kth converter station unit at the rectification side is connected with one end of the Kth-1 th converter station unit at the rectification side and is connected or not connected with one end of the converter station unit group in the 1 st inversion side through a direct current line. The other end of the (K + 1) th converter station unit on the rectifying side is connected with one end of the (K + 2) th converter station unit on the rectifying side, and is connected or not connected with the other end of the (1) th inversion side inner converter station unit group through a direct current line, if the two ends of the (1) th inversion side inner converter station unit group are connected with the direct current line, the neutral point of the (1) th inversion side inner converter station unit group is grounded or connected with a metal return wire. The other end of the x-th converter station unit on the rectifying side is connected with one end of the x-1-th converter station unit (K-1> ═ x > ═ 2) on the rectifying side, and is connected or not connected with one end of the y-th inversion side inner converter station unit group through a direct current line, the other end of the 2K + 1-x-th converter station unit on the rectifying side is connected with one end of the 2K + 2-x-th converter station unit on the rectifying side, and is connected or not connected with the other end of the y-th inversion side inner converter station unit group through a direct current line, and if both ends of the y-th inversion side inner converter station unit group are connected with the direct current line, the neutral point of the y-th inversion side inner (L-1> ═ y > -1) converter station unit group is grounded or connected with a metal return wire. The other end of the 1 st converter station unit on the rectifying side is connected with one end of the converter station unit group in the L-th inversion side through a direct current line, the other end of the 2K-th converter station unit on the rectifying side is connected with the other end of the converter station unit group in the L-th inversion side through a direct current line, and the other end of the converter station unit group in the L-th inversion side is grounded or connected with a metal return wire.
The invention also provides a method for realizing the hybrid layered direct-current power transmission system, which comprises the following steps:
a step of setting a rectification side and a step of setting an inversion side connected with the rectification side through a direct current line with no less than two voltage levels;
the rectification side setting step comprises the steps of setting N converter station units, and sequentially connecting the converter station units in series to form a converter station unit group;
arranging a plurality of converter station unit groups in the inversion side;
respectively corresponding the N converter station units on the rectifying side to M inverter sides through M direct current lines; wherein N > -2 and N > -M > -2.
In the above embodiment, the method further includes the step of setting a converter station unit formed by sequentially connecting a converter bus, a converter transformer and a converter in series; each converter is connected with a converter transformer.
Example (b):
as shown in fig. 1 to 3, the hybrid stratified dc power transmission system of the present invention includes a rectifying side 211, an inverting side 311, and a dc line 41 connecting the rectifying side 211 and the inverting side 311.
The rectifying side 211 and the inverting side 311 of the hybrid layered dc transmission system each comprise an LCC13 or a VSC14, a converter transformer 12 and an ac busbar 11, wherein each LCC and each VSC is connected to one converter transformer 12. The inverter side 311 and the dc line 41 each include a plurality of them.
The converter station unit on the rectifying side can be connected with the inverter-side converter through a direct-current line, or a certain converter station unit on the rectifying side is not externally connected with the rectifying side.
Specifically, the hybrid hierarchical dc power transmission system is a single-pole hybrid hierarchical dc power transmission system or a double-pole hybrid hierarchical dc power transmission system, and the hybrid hierarchical dc power transmission system shown in fig. 2 is a single-pole hybrid hierarchical dc power transmission system.
It should be noted that, a hybrid laminated dc power transmission system generally includes 1 rectifying side and a plurality of inverting sides. Therefore, if the hybrid hierarchical dc transmission system is a single-pole hybrid hierarchical dc transmission system, 1 rectifying side of the hybrid hierarchical dc transmission system includes the converter station unit group 211 (including the converter station unit 21 and the converter station unit 22 shown on the left side of fig. 2), and the number of inverting sides is 2, where the first rectifying side includes the converter station unit group 311 (including the converter station unit 31 shown in the middle of fig. 2), the second rectifying side includes the converter station unit group 311 (including the two converter station units 31 shown on the right side of fig. 2 in series), and the inverting sides are connected to the rectifying side by a plurality of dc lines (e.g. two dc lines 41 in fig. 2).
One end of the 2 nd converter station unit at the lower end of the rectification side is grounded or connected with a metal return wire, the other end of the 2 nd converter station unit is connected with one end of the 1 st converter station unit at the rectification side and is connected with one end of the 1 st inversion side inner converter station unit group through a direct current line, and the other end of the 1 st inversion side inner converter station unit group is grounded or connected with a metal return wire; the other end of the 1 st converter station unit on the rectifying side is connected with one end of the 2 nd inversion side inner converter station unit group through a direct current line, and the other end of the 2 nd inversion side inner converter station unit group is grounded or connected with a metal return wire.
It should be further noted that the rectification side 211 of one 2 LCC converter station units, the two inversion sides 311 respectively including 1 and 2 LCC converter station units, and the two dc lines 41 with different voltage levels included in the hybrid hierarchical dc transmission system shown in fig. 2 are only one implementation manner of the present invention, and the structure of the hybrid hierarchical dc transmission system including other numbers of converters and dc lines also belongs to the protection scope of the present invention, and the present invention is not particularly limited.
Illustratively, as shown in fig. 3, if the hybrid hierarchical dc transmission system is a bipolar hybrid hierarchical dc transmission system, 1 rectifying side of the hybrid hierarchical dc transmission system includes 2 converter station unit groups 211, the upper one is an anode, the lower one is a cathode, the two converter station unit groups are completely symmetrical in structure (e.g., the converter station unit 21 and the converter station unit 22 shown on the left side of fig. 3, and there are 4 converter station units, as shown in the figure, the 1 st, the 2 nd, the 3 rd and the 4 th converter station units are sequentially arranged from top to bottom), the number of inverting sides is 2, the first one includes two converter station unit groups 311, the upper one is an anode, the lower one is a cathode, the two converter station unit groups are completely symmetrical in structure (e.g., the converter station unit 31 shown in the middle of fig. 3), the second one includes two converter stations 311, the upper one is an anode, the next one is used as a negative electrode, the two converter station unit group structures are completely symmetrical (the two converter station units 31 are connected in series as shown in the right side of fig. 3), and the inversion side is connected with the rectification side by 4 direct current lines (4 direct current lines 41 in fig. 3).
The second converter station unit at the rectification side is grounded or connected with a metal return wire at a neutral point of the third converter station unit at the rectification side, the other end of the third converter station unit at the rectification side is connected with one end of the first converter station unit at the rectification side, and is connected with one end of a converter station unit group in the first inversion side through a direct current line, the other end of the third converter station unit at the rectification side is connected with one end of a converter station unit group in the second inversion side through a direct current line, and is connected with the other end of the converter station unit group in the first inversion side through a direct current line, and both ends of the converter station unit group in the first inversion side are connected with the direct current line, so that the neutral point of the converter station unit group in the first inversion side is grounded or connected with the metal return wire; the other end of the 1 st converter station unit on the rectifying side is connected with one end of the converter station unit group in the 2 nd inversion side through a direct current line, the other end of the 4 th converter station unit on the rectifying side is connected with the other end of the converter station unit group in the 2 nd inversion side through a direct current line, and the other end of the converter station unit group in the 2 nd inversion side is grounded or connected with a metal return wire.
It should be noted that the dc line level according to the present invention may be any voltage level, and is not limited herein.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention.
Claims (7)
1. A hybrid stratified dc power transmission system, comprising: the system comprises a rectifying side and an inverter side, wherein the inverter side is connected with the rectifying side through a direct current line with at least two voltage levels;
the rectifying side comprises N converter station units, and the converter station units are sequentially connected in series to form a converter station unit group; a plurality of converter station unit groups are arranged in the inversion side; the N converter station units on the rectifying side respectively correspond to the M inverter sides through M direct-current lines; wherein N > ═ 2, and N > ═ M > -2;
the system is a monopole structure hybrid layered direct-current power transmission system or a bipolar structure hybrid layered direct-current power transmission system;
the hybrid layered direct-current transmission system is a single-pole structure hybrid layered direct-current transmission system, and 1 rectifying side of the system comprises R converter station units, S inversion sides and S direct-current lines with voltage levels;
one end of the 1 st converter station unit on the rectifying side is grounded or connected with a metal return wire, the other end of the 1 st converter station unit on the rectifying side is connected with one end of the 2 nd converter station unit on the rectifying side, and is connected or not connected with one end of the 1 st converter station unit group in the inverting side through the direct current line, if so, the other end of the 1 st converter station unit group in the inverting side is grounded or connected with a metal return wire; the x-th converter station unit on the rectifying side is connected with one end of the x + 1-th converter station unit on the rectifying side, the other end of the x-th converter station unit on the rectifying side is connected or not connected with one end of the y-th converter station unit group in the inverting side through the direct current line, and if the x-th converter station unit on the rectifying side is connected with the y-th converter station unit group in the inverting side, the other end of the y-th converter station unit group in the inverting side is grounded or connected with a metal return wire; the other end of the R-th converter station unit on the rectifying side is connected with one end of the S-th inner converter station unit group on the inverting side through the direct current line, and the other end of the S-th inner converter station unit group on the inverting side is grounded or connected with a metal return wire; wherein, R-1 ═ x > ═ 2, S-1 ═ y ═ 1;
the hybrid layered direct-current power transmission system is a bipolar structure hybrid layered direct-current power transmission system, and 1 rectifying side of the system comprises 2K converter station units, L inversion sides and L direct-current lines with positive and negative symmetrical voltage levels;
the K-th converter station unit on the rectifying side is grounded with a neutral point of the K + 1-th converter station unit on the rectifying side, the other end of the K-th converter station unit on the rectifying side is connected with one end of the K-1-th converter station unit on the rectifying side, and is connected with one end of the 1 st internal converter station unit group on the inverting side through the direct current line, the other end of the K + 1-th converter station unit on the rectifying side is connected with one end of the K + 2-th converter station unit on the rectifying side, and is connected with the other end of the 1 st internal converter station unit group on the inverting side through the direct current line, both ends of the 1 st internal converter station unit group on the inverting side are connected with the direct current line, and then the neutral point of the 1 st internal converter station unit group on the inverting side is grounded; the other end of the xth converter station unit on the rectifying side is connected with one end of the xth-1 converter station unit on the rectifying side, and is connected with one end of the unit group of the converter stations in the inversion side through the direct current line, the other end of the 2K + 1-xth converter station unit on the rectifying side is connected with one end of the 2K + 2-xth converter station unit on the rectifying side, and is connected with the other end of the unit group of the converter stations in the inversion side through the direct current line, and both ends of the unit group of the converter stations in the inversion side are connected with the direct current line, so that the neutral point of the unit group of the converter stations in the inversion side is grounded; the other end of the 1 st converter station unit on the rectifying side is connected with one end of the L-th inversion side inner converter station unit group through the direct current line, the other end of the 2K-th converter station unit on the rectifying side is connected with the other end of the L-th inversion side inner converter station unit group through the direct current line, and the other end of the L-th inversion side inner converter station unit group is grounded or connected with a metal return wire; wherein, K-1 ═ x > -2, and L-1 ═ y ═ 1.
2. The system of claim 1, wherein: the voltage grades of the direct current lines are M.
3. The system of claim 1, wherein: the converter station units respectively comprise a converter bus, a converter transformer and a converter which are sequentially connected in series; each converter is connected with one converter transformer.
4. The system of claim 3, wherein: the converter station units are connected in parallel.
5. The system of claim 3 or 4, wherein: the converter adopts a power grid commutation converter LCC or a voltage source converter VSC.
6. A method for realizing a hybrid layered direct current transmission system is characterized by comprising the following steps:
a step of setting a rectification side and a step of setting an inversion side connected with the rectification side through a direct current line with no less than two voltage levels;
the rectifying side setting step comprises the step of setting N converter station units, wherein the converter station units are sequentially connected in series to form a converter station unit group;
arranging a plurality of converter station unit groups in an inversion side;
the N converter station units on the rectifying side respectively correspond to the M inverter sides through M direct-current lines; wherein N > ═ 2, and N > ═ M > -2;
the hybrid layered direct-current power transmission system is a monopole structure hybrid layered direct-current power transmission system or a bipolar structure hybrid layered direct-current power transmission system;
the hybrid layered direct-current transmission system is a single-pole structure hybrid layered direct-current transmission system, and 1 rectifying side of the system comprises R converter station units, S inversion sides and S direct-current lines with voltage levels;
one end of the 1 st converter station unit on the rectifying side is grounded or connected with a metal return wire, the other end of the 1 st converter station unit on the rectifying side is connected with one end of the 2 nd converter station unit on the rectifying side, and is connected or not connected with one end of the 1 st converter station unit group in the inverting side through the direct current line, if so, the other end of the 1 st converter station unit group in the inverting side is grounded or connected with a metal return wire; the x-th converter station unit on the rectifying side is connected with one end of the x + 1-th converter station unit on the rectifying side, the other end of the x-th converter station unit on the rectifying side is connected or not connected with one end of the y-th converter station unit group in the inverting side through the direct current line, and if the x-th converter station unit on the rectifying side is connected with the y-th converter station unit group in the inverting side, the other end of the y-th converter station unit group in the inverting side is grounded or connected with a metal return wire; the other end of the R-th converter station unit on the rectifying side is connected with one end of the S-th inner converter station unit group on the inverting side through the direct current line, and the other end of the S-th inner converter station unit group on the inverting side is grounded or connected with a metal return wire; wherein, R-1 ═ x > ═ 2, S-1 ═ y ═ 1;
the hybrid layered direct-current power transmission system is a bipolar structure hybrid layered direct-current power transmission system, and 1 rectifying side of the system comprises 2K converter station units, L inversion sides and L direct-current lines with positive and negative symmetrical voltage levels;
the K-th converter station unit on the rectifying side is grounded with a neutral point of the K + 1-th converter station unit on the rectifying side, the other end of the K-th converter station unit on the rectifying side is connected with one end of the K-1-th converter station unit on the rectifying side, and is connected with one end of the 1 st internal converter station unit group on the inverting side through the direct current line, the other end of the K + 1-th converter station unit on the rectifying side is connected with one end of the K + 2-th converter station unit on the rectifying side, and is connected with the other end of the 1 st internal converter station unit group on the inverting side through the direct current line, both ends of the 1 st internal converter station unit group on the inverting side are connected with the direct current line, and then the neutral point of the 1 st internal converter station unit group on the inverting side is grounded; the other end of the xth converter station unit on the rectifying side is connected with one end of the xth-1 converter station unit on the rectifying side, and is connected with one end of the unit group of the converter stations in the inversion side through the direct current line, the other end of the 2K + 1-xth converter station unit on the rectifying side is connected with one end of the 2K + 2-xth converter station unit on the rectifying side, and is connected with the other end of the unit group of the converter stations in the inversion side through the direct current line, and both ends of the unit group of the converter stations in the inversion side are connected with the direct current line, so that the neutral point of the unit group of the converter stations in the inversion side is grounded; the other end of the 1 st converter station unit on the rectifying side is connected with one end of the L-th inversion side inner converter station unit group through the direct current line, the other end of the 2K-th converter station unit on the rectifying side is connected with the other end of the L-th inversion side inner converter station unit group through the direct current line, and the other end of the L-th inversion side inner converter station unit group is grounded or connected with a metal return wire; wherein, K-1 ═ x > -2, and L-1 ═ y ═ 1.
7. The method of claim 6, wherein: a step of arranging a converter station unit formed by sequentially connecting a converter bus, a converter transformer and a converter in series; each converter is connected with one converter transformer.
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