CN110417043A - High-voltage direct-current main wiring structure and method suitable for connection of overhead line and submarine cable - Google Patents
High-voltage direct-current main wiring structure and method suitable for connection of overhead line and submarine cable Download PDFInfo
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- CN110417043A CN110417043A CN201910764746.2A CN201910764746A CN110417043A CN 110417043 A CN110417043 A CN 110417043A CN 201910764746 A CN201910764746 A CN 201910764746A CN 110417043 A CN110417043 A CN 110417043A
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- 238000002955 isolation Methods 0.000 claims abstract description 5
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- 230000015556 catabolic process Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
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Classifications
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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]
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Abstract
The invention discloses a high-voltage direct-current main wiring structure and a high-voltage direct-current main wiring method suitable for connecting an overhead line and a submarine cable, wherein the high-voltage direct-current main wiring structure comprises a rectification side and an inversion side which is connected with the rectification side through a direct-current line; a, B and N buses are respectively arranged on the rectifying side and the inverting side; a rectifying side converter is respectively connected between the bus A and the bus N corresponding to the rectifying side and between the bus B and the bus N; an inversion side converter is respectively connected between the A bus and the N bus corresponding to the inversion side and between the B bus and the N bus; polar line isolating switches L1, L2, L3 and L4 are respectively connected between the A bus and the B bus corresponding to the rectification side and the A bus and the B bus corresponding to the inversion side and the positive electrode of the direct current line; polar line isolation switches L5 and L6, L7 and L8 are respectively connected between the A bus and the B bus corresponding to the rectification side and the A bus and the B bus corresponding to the inversion side and the negative pole of the direct current line. The polarity inversion of the DC system can be completed, and the voltage polarity of the DC line is not changed, so that the adverse effect caused by the breakdown of the submarine cable is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of high-voltage direct-current transmission, in particular to a high-voltage direct-current main wiring structure and a high-voltage direct-current main wiring method suitable for connecting an overhead line and a submarine cable.
Background
The high-voltage direct current transmission technology is a transmission technology which realizes remote transmission of electric energy by rectifying three-phase alternating current at an alternating current side into direct current through a rectifier side converter, transmitting the direct current to an inverter side converter through a direct current circuit, and inverting the direct current into three-phase alternating current through the inverter side converter. The inverter can realize polarity reversal by changing the trigger angle.
The polarity inversion is to realize the reverse flow of power by changing the trigger angles of the converters on the rectifying side and the inverting side. The specific explanation is as follows:
Ud＝Udi0cosα；
ud is the dc voltage and Udi0 is the dc no-load voltage, which can be assumed to be constant, and α is the firing angle of the converter, so that when the firing angle is <90 °, the converter operates in the rectifying state and the dc voltage Ud >0, and when the firing angle is >90 °, the converter operates in the inverting state and the dc voltage Ud < 0.
When the trigger angle of the original rectifier side converter is changed from below 90 degrees to above 90 degrees, the rectifier side converter operates in an inversion state, and the polarity of the output direct-current voltage of the converter is changed from plus to minus; meanwhile, the trigger angle of the original inverter side converter is changed from more than 90 degrees to less than 90 degrees, the inverter side converter operates in a rectification state, and the polarity of the output direct-current voltage of the inverter is changed from minus to plus; because of the unidirectional conductivity of the thyristor, the direction of the direct current on the direct current line is not changed, so the power direction of the direct current line is reversed. By changing the polarity of the voltage of the direct current line, the direction of the direct current is unchanged, thereby realizing the reversal of the power flow direction.
The main wiring mode of the existing direct current transmission system is mainly adopted as shown in figure 1, and two ends of a direct current positive and negative direct current circuit are respectively connected to the tops of a converter on a rectification side and a converter on an inversion side. The direct current lines are usually formed by overhead lines. However, this connection method is only suitable for the scenario where the dc line is composed of an overhead line, and when the overhead line is connected to the submarine cable, as shown in fig. 2, since the overhead line is a bare conductor, the exterior of the overhead line is not covered by an insulating layer, and the submarine cable is buried in the seabed, the exterior of the conductor is covered by an insulating layer, when the cable is subjected to a voltage of plus polarity, if the voltage polarity is suddenly changed from plus to minus, the insulating layer of the submarine cable may be broken down by a large rate, thereby causing a great damage to the system, causing a dc shutdown, and affecting the stability of the system. Therefore, when the submarine cable exists in the direct current line, the polarity of the voltage on the direct current polar line cannot be changed when the polar line is reversed, so that the adverse effect caused by the breakdown of the submarine cable can be avoided, but the traditional wiring mode cannot be realized.
Disclosure of Invention
The invention provides a high-voltage direct-current main wiring structure and a high-voltage direct-current main wiring method suitable for connecting an overhead line and a submarine cable, and aims to overcome the defects of the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a high-voltage direct-current main connection structure suitable for connecting an overhead line and a submarine cable, including a rectifying side and an inverting side, where the rectifying side and the inverting side are connected by a direct-current line; wherein,
three public buses, namely an A bus, a B bus and an N bus, are respectively established on the rectifying side and the inverting side; the bus A and the bus B are both connected with the direct current line, and the bus N is connected with the grounding electrode line;
a rectifying side converter is respectively connected between the bus A and the bus N corresponding to the rectifying side and between the bus B and the bus N;
an inversion side converter is respectively connected between the bus A and the bus N corresponding to the inversion side and between the bus B and the bus N;
polar line isolating switches L1 and L2 are connected between the A bus and the B bus corresponding to the rectifying side and the positive electrode of the direct current line respectively;
polar line isolating switches L3 and L4 are connected between the A bus and the B bus corresponding to the inversion side and the positive electrode of the direct current line respectively;
polar line isolating switches L5 and L6 are connected between the buses A and B corresponding to the rectifying side and the negative electrode of the direct current line respectively;
polar line isolating switches L7 and L8 are connected between the buses A and B corresponding to the inversion side and the negative electrode of the direct current line respectively.
Further, in the high-voltage direct-current main wiring structure suitable for connecting the overhead line and the submarine cable, the direct-current line is composed of the overhead line and the submarine cable.
Further, in the high-voltage direct-current main connection structure suitable for connecting an overhead line and a submarine cable, the positive pole of the direct-current line corresponds to the top of the rectification side converter and the bottom of the inversion side converter, and the negative pole of the direct-current line corresponds to the top of the inversion side converter and the bottom of the rectification side converter.
Further, in the high-voltage direct-current main wiring structure suitable for connecting the overhead line and the submarine cable, the rectification side converter and the inversion side converter are the same.
In a second aspect, an embodiment of the present invention provides a high-voltage direct current main connection method suitable for connecting an overhead line and a submarine cable, which is performed by using the high-voltage direct current main connection structure suitable for connecting an overhead line and a submarine cable described in the first aspect, and the method includes:
before polarity inversion, direct current power flows from the rectification side to the inversion side, the polar line isolation switches L1, L3, L5 and L7 are in a closed state, and the polar line isolation switches L2, L4, L6 and L8 are in an open state;
gradually reducing the power of the rectifying side and the inverting side until locking;
pole line disconnectors L1, L3, L5 and L7;
pole line disconnectors L2, L4, L6 and L8 are closed;
and unlocking the converter, changing the triggering angle of the rectification side converter to be more than 90 degrees, operating in an inversion state, changing the triggering angle of the inversion side converter to be less than 90 degrees, operating in a rectification state, and gradually increasing the direct current power to a normal level.
The high-voltage direct-current main wiring structure and the high-voltage direct-current main wiring method suitable for connecting the overhead line and the submarine cable can complete polarity inversion of a direct-current system and simultaneously do not change the voltage polarity of a direct-current line, so that adverse effects caused by breakdown of the submarine cable are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a main connection mode of a conventional direct-current power transmission system provided by the prior art;
fig. 2 is a schematic structural diagram of a main connection mode of a conventional direct-current power transmission system provided by the prior art;
fig. 3 is a schematic structural diagram of a high-voltage direct-current main connection structure suitable for connecting an overhead line and a submarine cable according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a high-voltage direct-current main connection method suitable for connecting an overhead line and a submarine cable according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example one
Referring to fig. 3, an embodiment of the present invention provides a high-voltage direct-current main connection structure suitable for connecting an overhead line and a submarine cable, including a rectifying side and an inverting side, where the rectifying side and the inverting side are connected by a direct-current line; wherein,
three public buses, namely an A bus, a B bus and an N bus, are respectively established on the rectifying side and the inverting side; the bus A and the bus B are both connected with the direct current line, and the bus N is connected with the grounding electrode line;
a rectifying side converter is respectively connected between the bus A and the bus N corresponding to the rectifying side and between the bus B and the bus N;
an inversion side converter is respectively connected between the bus A and the bus N corresponding to the inversion side and between the bus B and the bus N;
polar line isolating switches L1 and L2 are connected between the A bus and the B bus corresponding to the rectifying side and the positive electrode of the direct current line respectively;
polar line isolating switches L3 and L4 are connected between the A bus and the B bus corresponding to the inversion side and the positive electrode of the direct current line respectively;
polar line isolating switches L5 and L6 are connected between the buses A and B corresponding to the rectifying side and the negative electrode of the direct current line respectively;
polar line isolating switches L7 and L8 are connected between the buses A and B corresponding to the inversion side and the negative electrode of the direct current line respectively.
Wherein, the direct current pipeline comprises overhead line and submarine cable.
Specifically, the positive pole of the dc line corresponds to the top of the rectifying side converter and the bottom of the inverting side converter, and the negative pole of the dc line corresponds to the top of the inverting side converter and the bottom of the rectifying side converter.
The rectification side converter and the inversion side converter are the same.
The high-voltage direct-current main wiring structure suitable for connecting the overhead line and the submarine cable provided by the embodiment of the invention can complete polarity inversion of a direct-current system without changing the voltage polarity of a direct-current line, so that adverse effects caused by breakdown of the submarine cable are avoided.
Example two
Referring to fig. 4, a second embodiment of the present invention provides a high-voltage direct current main connection method suitable for connecting an overhead line and a submarine cable, which is performed by using the high-voltage direct current main connection structure suitable for connecting an overhead line and a submarine cable according to the first embodiment, and the method includes:
s101, before polarity inversion, direct current power flows from the rectification side to the inversion side, the polar isolating switches L1, L3, L5 and L7 are in a closed state, and the polar isolating switches L2, L4, L6 and L8 are in an open state.
And S102, gradually reducing the power of the rectifying side and the inverting side until locking.
Specifically, in order to enable the pole line disconnecting switch to reliably act, the rectification side and the inversion side are gradually powered down until the pole line disconnecting switch is locked, and the meaning of locking is as follows: the direct current power is 0, the rectification side converter and the inversion side converter are not conducted, and the direct current is reduced to 0.
S103, pole line disconnecting switches L1, L3, L5 and L7 are turned off.
It should be noted that the disconnection sequence is not required here.
S104, pole line closing isolating switches L2, L4, L6 and L8.
It should be noted that the order of closing is not required here.
And S105, unlocking the converter, changing the trigger angle of the rectification side converter to be more than 90 degrees, operating in an inversion state, changing the trigger angle of the inversion side converter to be less than 90 degrees, operating in a rectification state, and gradually increasing the direct current power to a normal level.
In the above operation process, although the polarity of the output voltage of the rectifying side converter and the polarity of the output voltage of the inverting side converter are reversed, the polarity of the voltage on the direct current pole line is not changed due to the knife switch operation of the pole line disconnecting switch, so that the insulation of the submarine cable is not affected.
The high-voltage direct-current main wiring method suitable for connecting the overhead line and the submarine cable provided by the embodiment of the invention can complete polarity inversion of a direct-current system without changing the voltage polarity of the direct-current line, thereby avoiding adverse effects caused by breakdown of the submarine cable.
The foregoing description of the embodiments has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same elements or features may also vary in many respects. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and "comprising" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being "on" … … "," engaged with "… …", "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected to or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on … …," "directly engaged with … …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as "inner," "outer," "below," "… …," "lower," "above," "upper," and the like, may be used herein for ease of description to describe a relationship between one element or feature and one or more other elements or features as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below … …" can encompass both an orientation of facing upward and downward. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted.
Claims (5)
1. A high-voltage direct-current main wiring structure suitable for connecting an overhead line and a submarine cable is characterized by comprising a rectifying side and an inverting side, wherein the rectifying side is connected with the inverting side through a direct-current line; wherein,
three public buses, namely an A bus, a B bus and an N bus, are respectively established on the rectifying side and the inverting side; the bus A and the bus B are both connected with the direct current line, and the bus N is connected with the grounding electrode line;
a rectifying side converter is respectively connected between the bus A and the bus N corresponding to the rectifying side and between the bus B and the bus N;
an inversion side converter is respectively connected between the bus A and the bus N corresponding to the inversion side and between the bus B and the bus N;
polar line isolating switches L1 and L2 are connected between the A bus and the B bus corresponding to the rectifying side and the positive electrode of the direct current line respectively;
polar line isolating switches L3 and L4 are connected between the A bus and the B bus corresponding to the inversion side and the positive electrode of the direct current line respectively;
polar line isolating switches L5 and L6 are connected between the buses A and B corresponding to the rectifying side and the negative electrode of the direct current line respectively;
polar line isolating switches L7 and L8 are connected between the buses A and B corresponding to the inversion side and the negative electrode of the direct current line respectively.
2. The high voltage direct current main connection structure suitable for overhead line to submarine cable connection according to claim 1, wherein said direct current line is constituted by overhead line and submarine cable.
3. The high-voltage direct-current main connection structure suitable for connecting an overhead line and a submarine cable according to claim 2, wherein a positive pole of the direct-current line corresponds to a top of the rectification side converter and a bottom of the inversion side converter, and a negative pole of the direct-current line corresponds to a top of the inversion side converter and a bottom of the rectification side converter.
4. The high voltage direct current main connection structure suitable for overhead line to submarine cable connection according to claim 1, wherein said rectifying side converter and said inverting side converter are identical.
5. A high-voltage direct current main connection method suitable for connecting an overhead line and a submarine cable is implemented by adopting the high-voltage direct current main connection structure suitable for connecting the overhead line and the submarine cable according to any one of claims 1-4, and is characterized by comprising the following steps:
before polarity inversion, direct current power flows from the rectification side to the inversion side, the polar line isolation switches L1, L3, L5 and L7 are in a closed state, and the polar line isolation switches L2, L4, L6 and L8 are in an open state;
gradually reducing the power of the rectifying side and the inverting side until locking;
pole line disconnectors L1, L3, L5 and L7;
pole line disconnectors L2, L4, L6 and L8 are closed;
and unlocking the converter, changing the triggering angle of the rectification side converter to be more than 90 degrees, operating in an inversion state, changing the triggering angle of the inversion side converter to be less than 90 degrees, operating in a rectification state, and gradually increasing the direct current power to a normal level.
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| CN201910764746.2A CN110417043A (en) | 2019-08-19 | 2019-08-19 | High-voltage direct-current main wiring structure and method suitable for connection of overhead line and submarine cable |
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| CN201910764746.2A CN110417043A (en) | 2019-08-19 | 2019-08-19 | High-voltage direct-current main wiring structure and method suitable for connection of overhead line and submarine cable |
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Cited By (1)
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| CN113054680A (en) * | 2021-03-17 | 2021-06-29 | 南方电网科学研究院有限责任公司 | Direct-current transmission power inversion method, device, equipment and storage medium |
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| CN107732894A (en) * | 2017-11-06 | 2018-02-23 | 许继电气股份有限公司 | A kind of control method of three end DC transmission system and its current conversion station |
| CN108808716A (en) * | 2018-06-19 | 2018-11-13 | 西安端怡科技有限公司 | A kind of extra-high voltage Hybrid HVDC system load flow inverts control method online |
| CN109120157A (en) * | 2018-10-09 | 2019-01-01 | 特变电工新疆新能源股份有限公司 | A kind of three-port DC electric power electric transformer |
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| CN107732894A (en) * | 2017-11-06 | 2018-02-23 | 许继电气股份有限公司 | A kind of control method of three end DC transmission system and its current conversion station |
| CN108808716A (en) * | 2018-06-19 | 2018-11-13 | 西安端怡科技有限公司 | A kind of extra-high voltage Hybrid HVDC system load flow inverts control method online |
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