CN113178855A - Medium-voltage radiation type bipolar direct-current power distribution system and method - Google Patents
Medium-voltage radiation type bipolar direct-current power distribution system and method Download PDFInfo
- Publication number
- CN113178855A CN113178855A CN202110396284.0A CN202110396284A CN113178855A CN 113178855 A CN113178855 A CN 113178855A CN 202110396284 A CN202110396284 A CN 202110396284A CN 113178855 A CN113178855 A CN 113178855A
- Authority
- CN
- China
- Prior art keywords
- pole double
- isolating switch
- direct current
- throw isolating
- breaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
- H02J1/082—Plural DC voltage, e.g. DC supply voltage with at least two different DC voltage levels
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/08—Three-wire systems; Systems having more than three wires
- H02J1/084—Three-wire systems; Systems having more than three wires for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J1/086—Three-wire systems; Systems having more than three wires for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load or loads and source or sources when the main path fails
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a medium-voltage radiation type bipolar direct-current power distribution system and a power distribution method, which comprise the following steps: the system comprises a bipolar direct current distribution network, a first direct current breaker, a second direct current breaker and four single-pole double-throw isolating switches; one end of the first direct current breaker is connected with a first direct current distribution line of the bipolar direct current distribution network, and the other end of the first direct current breaker is connected with a first fixed end of the first single-pole double-throw isolating switch and a first fixed end of the third single-pole double-throw isolating switch; one end of the second direct current breaker is connected with a second direct current distribution line of the bipolar direct current distribution network, and the other end of the second direct current breaker is connected with a second immobile end of the second single-pole double-throw isolating switch and a second immobile end of the fourth single-pole double-throw isolating switch. The medium-voltage radiation type bipolar direct-current power distribution system provided by the invention is based on the existing advantages of bipolar direct-current power distribution, realizes medium-voltage direct-current power distribution by additionally arranging four single-pole double-throw isolating switches, and has higher reliability and elasticity than an alternating-current power distribution structure.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a medium-voltage radiation type bipolar direct-current power distribution system and a power distribution method.
Background
The reliability is always an important basis for planning and designing the power distribution network, the power distribution network can be guaranteed to quickly and reasonably cope with common faults, and the planning and designing of the power distribution network simultaneously considers the reliability and the elasticity of the system. Scholars at home and abroad have a great deal of research on reliability, but research on elasticity only stays in defining concepts and is not unified. The british energy research center, the american electrical power systems engineering research center and some scholars have defined the flexibility of the system, including the concept of "4 Rs" flexibility, the concept of short-term and long-term flexibility and the concept of a flexible curve combining the course of events, etc.
With the wide application of the power electronic technology in the power distribution and utilization system, in order to solve the problems of the existing alternating current power distribution and utilization system, the research of the direct current power distribution technology has great significance for the construction and development of the power distribution network. The direct-current power distribution system can simplify a large number of alternating-current and direct-current conversion links in the existing power distribution and utilization equipment, reduce the loss of energy in the transmission process and improve the utilization efficiency of the energy. Studies have shown that direct current power distribution is feasible both technically and economically.
From the perspective of technical economy and full utilization of stock assets of an original alternating current power distribution system, alternating current and direct current hybrid power distribution is more likely to become a feasible transition technical mode. The bipolar direct-current power distribution system is bipolar power distribution, the operation of the other pole cannot be influenced when any one pole breaks down, the alternating-current power distribution system is three-phase power distribution, the system is powered off when any one phase breaks down, and therefore the elasticity of the whole power system can be increased to a certain extent by the bipolar direct-current power distribution system relatively.
At present, the elasticity of the system can be improved in three aspects of original components, structures and operation modes of the power distribution network. For example, the robustness of the system is improved by reinforcing and upgrading the original elements of the power system, the redundancy of the system is improved by adding a spare line or changing the structure of the line, the flexibility of the system is improved by adopting a faster protection control system, and the like. However, the above measures for improving the flexibility of the power distribution network are all based on the ac power distribution method, and all of them are to exchange the method of increasing the hardware investment for obtaining higher flexibility, and how to improve the flexibility of the whole power system is not considered from the viewpoint of the power distribution method.
Disclosure of Invention
To solve the problems in the prior art, embodiments of the present invention provide a medium-voltage radiation type bipolar dc power distribution system and a power distribution method.
The invention provides a medium-voltage radiation type bipolar direct-current power distribution system, which mainly comprises: the system comprises a bipolar direct current distribution network, a first direct current breaker, a second direct current breaker and four single-pole double-throw isolating switches; one end of the first direct current breaker is connected with a first direct current distribution line of the bipolar direct current distribution network, and the other end of the first direct current breaker is connected with a first fixed end of the first single-pole double-throw isolating switch and a first fixed end of the third single-pole double-throw isolating switch; the movable end of the first single-pole double-throw isolating switch is connected with the movable end of the second single-pole double-throw isolating switch and a first load; the movable end of the third single-pole double-throw isolating switch is connected with the movable end of the fourth single-pole double-throw isolating switch and the second load; one end of the second direct-current circuit breaker is connected with a second direct-current distribution line of the bipolar direct-current distribution network, and the other end of the second direct-current circuit breaker is connected with a second immobile end of the second single-pole double-throw isolating switch and a second immobile end of the fourth single-pole double-throw isolating switch; the second fixed end of the first single-pole double-throw isolating switch, the first fixed end of the second single-pole double-throw isolating switch, the second fixed end of the third single-pole double-throw isolating switch and the first fixed end of the fourth single-pole double-throw isolating switch are mutually connected and grounded.
According to the present invention, there is provided a medium voltage radiation type bipolar dc distribution system, the bipolar dc distribution network comprising:
the system comprises a first alternating current circuit breaker, a second alternating current circuit breaker, a first voltage source converter and a second voltage source converter; the alternating current main bus is connected to a first voltage source converter through a first alternating current breaker, and the first direct current distribution circuit is output from the first voltage source converter; the alternating current main bus is also connected to a second voltage source converter through a second alternating current breaker, and a second direct current distribution circuit is output from the second voltage source converter.
According to the present invention, there is provided a medium-voltage radiation type bipolar dc distribution system, further comprising: a third dc breaker and a fourth dc breaker; the third direct current breaker is positioned between the first voltage source converter and the first direct current power distribution line and used for controlling the on-off of the first direct current power distribution line; and the fourth direct current breaker is positioned between the second voltage source converter and the second direct current distribution line and used for controlling the on-off of the second direct current distribution line.
According to the medium-voltage radiation type bipolar direct-current distribution system provided by the invention, the first load and the second load are equal in size.
According to the present invention, there is provided a medium-voltage radiation type bipolar dc distribution system, further comprising: a fifth dc breaker and a sixth dc breaker; one end of a fifth direct current circuit breaker is connected with a zero line of the first direct current power distribution line, and the other end of the fifth direct current circuit breaker is grounded; one end of the sixth direct current breaker is connected with a zero line of the second direct current distribution line, and the other end of the sixth direct current breaker is grounded.
According to the medium-voltage radiation type bipolar direct-current power distribution system provided by the invention, the voltage of the alternating-current main bus is 10 KV; the voltage of the first direct current power distribution line is +7.5 KV; and the voltage of the second direct current distribution line is-7.5 KV.
The invention also provides a power distribution method based on any medium-voltage radiation type bipolar direct-current power distribution system, which comprises the following steps: under the condition of normal power supply, closing the first direct current breaker and the second direct current breaker; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
According to the power distribution method provided by the invention, under the condition that a first direct current power distribution line has a fault, a first direct current circuit breaker is opened and a second direct current circuit breaker is closed; connecting the movable end of the first single-pole double-throw isolating switch with the second fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the second fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
According to the power distribution method provided by the invention, under the condition that the second direct current distribution line has a fault, the second direct current circuit breaker is opened and the first direct current circuit breaker is closed; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the first fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the first fixed end of the fourth single-pole double-throw isolating switch.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the power distribution method as described in any one of the above.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the power distribution method as described in any of the above.
The medium-voltage radiation type bipolar direct-current power distribution system and the method provided by the invention are based on the existing advantages of bipolar direct-current power distribution, realize medium-voltage direct-current power distribution by additionally arranging four single-pole double-throw isolating switches, and have higher reliability and elasticity than an alternating-current power distribution structure.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for 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 some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a medium voltage radiation type bipolar dc distribution system provided by the present invention;
fig. 2 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
It should be noted that in the description of the embodiments of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element. The terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention 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. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
A medium voltage radiation type bipolar dc distribution system provided by an embodiment of the present invention will be described below with reference to fig. 1 to 2.
Fig. 1 is a schematic structural diagram of a medium-voltage radiation type bipolar dc distribution system provided by the present invention, as shown in fig. 1, mainly including: the system comprises a bipolar direct current distribution network, a first direct current breaker F5, a second direct current breaker F6 and four single-pole double-throw isolating switches;
one end of the first direct current breaker F5 is connected with a first direct current distribution line L1 of a double-pole direct current distribution network, and the other end of the first direct current breaker F5 is connected with a first fixed end 1 of a first single-pole double-throw isolating switch and a first fixed end 5 of a third single-pole double-throw isolating switch; the movable end of the first single-pole double-throw isolating switch is connected with the movable end of the second single-pole double-throw isolating switch and a first load LP 1; the movable end of the third single-pole double-throw isolating switch is connected with the movable end of the fourth single-pole double-throw isolating switch and a second load LP 2; one end of a second direct current breaker F6 is connected with a second direct current distribution line L2 of the double-pole direct current distribution network, and the other end of the second direct current breaker F6 is connected with a second fixed end 4 of a second single-pole double-throw isolating switch and a second fixed end 8 of a fourth single-pole double-throw isolating switch; the second fixed end 2 of the first single-pole double-throw isolating switch, the first fixed end 3 of the second single-pole double-throw isolating switch, the second fixed end 6 of the third single-pole double-throw isolating switch and the first fixed end 7 of the fourth single-pole double-throw isolating switch are mutually connected and grounded.
As shown in fig. 1, the main line structure of the medium-voltage radiation type bipolar dc distribution system provided by the present invention mainly includes:
the bus is respectively connected to a voltage source converter VSC1 through an alternating current breaker for rectification, and then a direct current distribution line L1 is led out through a direct current breaker F3, and an isolating switch does not need to be arranged on the line. Correspondingly, as a symmetrical structure of the bipolar direct current distribution network, the buses are respectively connected to a voltage source converter VSC2 through an alternating current breaker for rectification, and then lead out a direct current distribution line L2 through a direct current breaker F4.
The branch line structure of the medium-voltage radiation type bipolar direct-current power distribution system mainly comprises: the first load LP1 is composed of a first direct current breaker F5, a second load LP2 is composed of a second direct current breaker F6, and four single-pole double-throw isolating switches.
According to the structure, the flexibility and the reliability of direct-current power distribution can be improved through the on-off matching of the first direct-current circuit breaker F5, the second direct-current circuit breaker F6 and the four single-pole double-throw isolating switches, and the selection of various operation modes is realized.
The medium-voltage radiation type bipolar direct-current power distribution system provided by the invention is based on the existing advantages of bipolar direct-current power distribution, realizes medium-voltage direct-current power distribution by additionally arranging four single-pole double-throw isolating switches, and has higher reliability and elasticity than an alternating-current power distribution structure.
Based on the content of the foregoing embodiments, as an alternative embodiment, the bipolar dc power distribution network mainly includes, but is not limited to: a first ac breaker F1, a second ac breaker F2, a first voltage source converter VSC1, a second voltage source converter VSC 2; the alternating current main bus is connected to the first voltage source converter through the first alternating current breaker F1, and a first direct current distribution line L1 is output from the first voltage source converter VSC 1; the ac main bus is also connected to a second voltage source converter VSC2 via a second ac breaker F2 and a second dc distribution line L2 is output from the second voltage source converter VSC 2.
It should be noted that the bipolar dc distribution network provided by the present invention may adopt a conventional bipolar dc distribution network in a target power system, wherein the first dc distribution line L1 and the second dc distribution line L2 respectively provide dc power for two different loads.
Optionally, the voltage of the ac main bus is 10 KV; the voltage of the first direct current power distribution line is +7.5 KV; the voltage of the second direct current distribution line is-7.5 KV.
Optionally, the first load LP1 and the second load are equal in size. In other words, in the process of constructing the whole power network system, the loads connected to the first dc distribution line L1 and the second dc distribution line L2 are ensured to be the same as much as possible by counting the sizes of all the loads, so that the first load LP1 and the second load LP2 are respectively supplied with power by positive and negative poles and share one ground pole under the condition that the two dc distribution lines normally operate. If the two loads are equal in size, the current to ground of the grounding electrode is 0, so that the corrosion of the power system can be reduced to the greatest extent, and the service life of the whole system is prolonged.
Based on the content of the above embodiments, the medium-voltage radiation type bipolar dc distribution system provided by the present invention may further include: a third dc breaker F3 and a fourth dc breaker F4; a third dc breaker F3 is located between the first voltage source converter VSC1 and the first dc distribution line L1, and is configured to control the on/off of the first dc distribution line L1; a fourth dc breaker F4 is located between the second voltage source converter VSC2 and the second dc distribution line L2 for controlling the switching of the second dc distribution line L2.
For example, if an individual component fault occurs in the first dc distribution line L1, it is ensured that the faulty component is repaired or replaced after the first dc distribution line L1 is powered off by opening the third dc breaker F3 and switching the four single-pole double-throw disconnectors accordingly, without affecting the normal operation of the second dc distribution line L2 and the second load LP 2.
Meanwhile, the first load LP1 can be switched to be supplied by the second dc distribution line L2 by switching the states of the four single-pole double-throw isolating switches without affecting the normal operation of the first load LP 1.
According to the medium-voltage radiation type bipolar direct-current power distribution system, the direct-current circuit breaker is additionally arranged between each direct-current power distribution line and the corresponding voltage source converter, so that the normal operation of a load can be guaranteed to the greatest extent on the basis of ensuring the maintenance safety, and the elasticity of the whole power system is effectively improved.
Based on the content of the above embodiments, the medium-voltage radiation type bipolar dc distribution system provided by the present invention may further include: a fifth dc breaker F7 and a sixth dc breaker F8; one end of a fifth direct current breaker F7 is connected with a zero line of the first direct current distribution line L1, and the other end of the fifth direct current breaker F7 is grounded; one end of the sixth dc breaker F8 is connected to the neutral line of the second dc distribution line L2, and the other end of the sixth dc breaker is grounded.
In the medium-voltage radiation type bipolar direct-current power distribution system, a bipolar direct-current power distribution network is formed by transformation based on the existing three-phase four-wire alternating-current network, and three wires in the original three-phase four-wire are used as the inlet wires of a voltage source converter to be connected with an alternating-current main bus. The fourth line of the original three-phase four-line can be fully utilized to be used as the zero line of the voltage source converter.
The medium-voltage radiation type bipolar direct-current power distribution system provided by the invention fully utilizes the structure of the existing alternating-current power distribution network system, realizes the medium-voltage radiation type bipolar direct-current power distribution system on the basis of the structure, and effectively reduces the reconstruction cost.
On the basis of the medium-voltage radiation type bipolar direct-current power distribution system provided by the embodiment, the invention further provides a power distribution method, which is used for realizing selection of multiple operation modes based on different network operation states and specifically comprises the following steps:
on the one hand, in case of normal power supply, the first dc breaker F5 and the second dc breaker F6 are closed; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end 1 of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end 3 of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end 6 of the third single-pole double-throw isolating switch; the moving end of the fourth single-pole double-throw isolating switch is connected with the second fixed end 8 of the fourth single-pole double-throw isolating switch.
By adopting the operation mode, the two loads LP1 and LP2 are respectively supplied with power by a positive direct-current distribution line and a negative direct-current distribution line and share one grounding electrode; if the two loads LP1 and LP2 are equal in size, the ground current of the ground electrode is 0, so that the corrosion can be reduced and the service life can be prolonged.
On the other hand, in the case of a fault in the first dc power distribution line, the relevant fault circuit needs to be broken, so the first dc breaker F5 is opened and the second dc breaker F6 is closed; connecting the movable end of the first single-pole double-throw isolating switch with the second fixed end 2 of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with a second fixed end 4 of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end 6 of the third single-pole double-throw isolating switch; the moving end of the fourth single-pole double-throw isolating switch is connected with the second fixed end 8 of the fourth single-pole double-throw isolating switch.
By adopting the operation mode, when the first dc power distribution line LP1 fails, the first dc power distribution line LP1 can be disconnected from the whole power network system; meanwhile, through switching control of the four single-pole double-throw isolating switches, the first load born by the first direct-current power distribution line LP1 originally is supplied with power by the second direct-current power distribution line LP2, normal operation of the whole power system can be effectively guaranteed, and system elasticity is improved to the maximum extent.
Correspondingly, in the case of a fault of the second direct current distribution line, the second direct current breaker F6 is opened and the first direct current breaker F5 is closed correspondingly; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end 1 of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end 3 of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the first fixed end 5 of the third single-pole double-throw isolating switch; the moving end of the fourth single-pole double-throw isolating switch is connected with the first fixed end 7 of the fourth single-pole double-throw isolating switch.
Furthermore, under the condition of large-range fault, only one pole with few fault line sections needs to be repaired preferentially, and power can be quickly restored for all loads.
The power distribution method provided by the invention is based on a medium-voltage radiation type bipolar direct-current power distribution system, can flexibly cope with individual element faults or large-area element faults, and has higher reliability and elasticity than an alternating-current power distribution structure.
It should be noted that, when being specifically executed, the power distribution method provided in the embodiment of the present invention may be implemented based on the medium-voltage radiation type bipolar dc power distribution system described in any of the above embodiments, and details of this embodiment are not described herein.
The power distribution method provided by the invention is based on the existing advantages of bipolar direct current power distribution, realizes medium-voltage direct current power distribution by additionally arranging four single-pole double-throw isolating switches, and has stronger reliability and elasticity than an alternating current power distribution structure.
Fig. 2 is a schematic structural diagram of an electronic device provided in the present invention, and as shown in fig. 2, the electronic device may include: a processor (processor)210, a communication interface (communication interface)220, a memory (memory)230 and a communication bus 240, wherein the processor 210, the communication interface 220 and the memory 230 are communicated with each other via the communication bus 240. Processor 210 may invoke logic instructions in memory 230 to perform a power distribution method that includes: under the condition of normal power supply, closing the first direct current breaker and the second direct current breaker; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
Under the condition of a fault of the first direct current power distribution line, opening the first direct current circuit breaker and closing the second direct current circuit breaker; connecting the movable end of the first single-pole double-throw isolating switch with the second fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the second fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
Under the condition that the second direct current distribution line has a fault, opening the second direct current breaker and closing the first direct current breaker; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the first fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the first fixed end of the fourth single-pole double-throw isolating switch.
In addition, the logic instructions in the memory 230 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps described in the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform each of the provided power distribution methods, the method comprising: under the condition of normal power supply, closing the first direct current breaker and the second direct current breaker; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
Under the condition of a fault of the first direct current power distribution line, opening the first direct current circuit breaker and closing the second direct current circuit breaker; connecting the movable end of the first single-pole double-throw isolating switch with the second fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the second fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
Under the condition that the second direct current distribution line has a fault, opening the second direct current breaker and closing the first direct current breaker; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the first fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the first fixed end of the fourth single-pole double-throw isolating switch.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the power distribution method provided by the above embodiments, and the method includes: under the condition of normal power supply, closing the first direct current breaker and the second direct current breaker; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
Under the condition of a fault of the first direct current power distribution line, opening the first direct current circuit breaker and closing the second direct current circuit breaker; connecting the movable end of the first single-pole double-throw isolating switch with the second fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the second fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
Under the condition that the second direct current distribution line has a fault, opening the second direct current breaker and closing the first direct current breaker; connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch; connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch; connecting the movable end of the third single-pole double-throw isolating switch with the first fixed end of the third single-pole double-throw isolating switch; and connecting the movable end of the fourth single-pole double-throw isolating switch with the first fixed end of the fourth single-pole double-throw isolating switch.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute various embodiments or some portions of embodiments described above.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A medium voltage radiant bipolar dc power distribution system comprising:
the system comprises a bipolar direct current distribution network, a first direct current breaker, a second direct current breaker and four single-pole double-throw isolating switches;
one end of the first direct current breaker is connected with a first direct current distribution line of the bipolar direct current distribution network, and the other end of the first direct current breaker is connected with a first fixed end of a first single-pole double-throw isolating switch and a first fixed end of a third single-pole double-throw isolating switch;
the movable end of the first single-pole double-throw isolating switch is connected with the movable end of the second single-pole double-throw isolating switch and a first load;
the movable end of the third single-pole double-throw isolating switch is connected with the movable end of the fourth single-pole double-throw isolating switch and a second load;
one end of the second direct current breaker is connected with a second direct current distribution line of the bipolar direct current distribution network, and the other end of the second direct current breaker is connected with a second fixed end of the second single-pole double-throw isolating switch and a second fixed end of the fourth single-pole double-throw isolating switch;
the second fixed end of the first single-pole double-throw isolating switch, the first fixed end of the second single-pole double-throw isolating switch, the second fixed end of the third single-pole double-throw isolating switch and the first fixed end of the fourth single-pole double-throw isolating switch are connected with each other and grounded.
2. The medium voltage radiating bipolar dc power distribution system of claim 1, wherein said bipolar dc power distribution network comprises:
the system comprises a first alternating current circuit breaker, a second alternating current circuit breaker, a first voltage source converter and a second voltage source converter;
an alternating current main bus is connected to the first voltage source converter through the first alternating current breaker, and the first direct current distribution circuit is output from the first voltage source converter;
the alternating current main bus is connected to the second voltage source converter through the second alternating current breaker, and the second direct current distribution circuit is output from the second voltage source converter.
3. The medium voltage radiating bipolar dc power distribution system of claim 2, further comprising: a third dc breaker and a fourth dc breaker;
the third direct current breaker is positioned between the first voltage source converter and the first direct current distribution line and used for controlling the connection and disconnection of the first direct current distribution line;
and the fourth direct current breaker is positioned between the second voltage source converter and the second direct current distribution line and is used for controlling the on-off of the second direct current distribution line.
4. The medium voltage radiant bipolar dc power distribution system as claimed in claim 1, wherein the first load and the second load are equal in magnitude.
5. The medium voltage radiating bipolar dc power distribution system of claim 2, further comprising: a fifth dc breaker and a sixth dc breaker;
one end of the fifth direct current circuit breaker is connected with a zero line of the first direct current distribution line, and the other end of the fifth direct current circuit breaker is grounded;
one end of the sixth direct current circuit breaker is connected with the zero line of the second direct current distribution line, and the other end of the sixth direct current circuit breaker is grounded.
6. The medium voltage radiant bipolar dc distribution system of claim 2 wherein the ac main bus is at a voltage of 10 KV; the voltage of the first direct current power distribution line is +7.5 KV; and the voltage of the second direct current distribution line is-7.5 KV.
7. A power distribution method based on the medium voltage radiating bipolar DC power distribution system of any of claims 1-6, characterized by comprising:
under the condition of normal power supply, closing the first direct current breaker and the second direct current breaker;
connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch;
connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch;
connecting the moving end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch;
and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
8. The method of distributing power of claim 7, comprising:
in case of a fault of the first direct current power distribution line, opening the first direct current breaker and closing the second direct current breaker;
connecting the movable end of the first single-pole double-throw isolating switch with the second fixed end of the first single-pole double-throw isolating switch;
connecting the movable end of the second single-pole double-throw isolating switch with the second fixed end of the second single-pole double-throw isolating switch;
connecting the moving end of the third single-pole double-throw isolating switch with the second fixed end of the third single-pole double-throw isolating switch;
and connecting the movable end of the fourth single-pole double-throw isolating switch with the second fixed end of the fourth single-pole double-throw isolating switch.
9. The method of distributing power of claim 7, comprising:
under the condition that the second direct current distribution line has a fault, opening the second direct current breaker and closing the first direct current breaker;
connecting the movable end of the first single-pole double-throw isolating switch with the first fixed end of the first single-pole double-throw isolating switch;
connecting the movable end of the second single-pole double-throw isolating switch with the first fixed end of the second single-pole double-throw isolating switch;
connecting the moving end of the third single-pole double-throw isolating switch with the first fixed end of the third single-pole double-throw isolating switch;
and connecting the movable end of the fourth single-pole double-throw isolating switch with the first fixed end of the fourth single-pole double-throw isolating switch.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the power distribution method according to any of claims 7 to 9 when executing the computer program.
11. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the power distribution method according to any of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110396284.0A CN113178855B (en) | 2021-04-13 | 2021-04-13 | Medium-voltage radiation type bipolar direct-current power distribution system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110396284.0A CN113178855B (en) | 2021-04-13 | 2021-04-13 | Medium-voltage radiation type bipolar direct-current power distribution system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113178855A true CN113178855A (en) | 2021-07-27 |
| CN113178855B CN113178855B (en) | 2022-08-30 |
Family
ID=76923370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110396284.0A Active CN113178855B (en) | 2021-04-13 | 2021-04-13 | Medium-voltage radiation type bipolar direct-current power distribution system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113178855B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050207082A1 (en) * | 2004-03-17 | 2005-09-22 | Bosch Martin S | Dual bus static tie switch |
| CN204732962U (en) * | 2015-07-10 | 2015-10-28 | 美登思电气（上海）有限公司 | Dual-power switching system |
| CN106059055A (en) * | 2016-07-01 | 2016-10-26 | 无锡韩光电器股份有限公司 | Control circuit of automatic changeover switch device |
| US9882425B1 (en) * | 2013-03-15 | 2018-01-30 | Reliance Controls Corporation | Multi-circuit switching device |
| CN110690694A (en) * | 2018-07-05 | 2020-01-14 | 株式会社村田制作所 | Input power supply selection circuit |
-
2021
- 2021-04-13 CN CN202110396284.0A patent/CN113178855B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050207082A1 (en) * | 2004-03-17 | 2005-09-22 | Bosch Martin S | Dual bus static tie switch |
| US9882425B1 (en) * | 2013-03-15 | 2018-01-30 | Reliance Controls Corporation | Multi-circuit switching device |
| CN204732962U (en) * | 2015-07-10 | 2015-10-28 | 美登思电气（上海）有限公司 | Dual-power switching system |
| CN106059055A (en) * | 2016-07-01 | 2016-10-26 | 无锡韩光电器股份有限公司 | Control circuit of automatic changeover switch device |
| CN110690694A (en) * | 2018-07-05 | 2020-01-14 | 株式会社村田制作所 | Input power supply selection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 罗艳等: "变电站直流系统的运行与维护", 《电气应用》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113178855B (en) | 2022-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102082432B (en) | Cascading convertor station and cascading multi-terminal high-voltage direct-current (MTHVDC) transmission system | |
| US9865410B2 (en) | Methods, systems, and computer readable media for topology control and switching loads or sources between phases of a multi-phase power distribution system | |
| CN111049270A (en) | Intelligent outdoor switch box and closed-loop I-shaped power distribution network thereof | |
| US5872707A (en) | SVC converter with an extra phase leg to replace a failed phase leg | |
| CN109347134B (en) | Bipolar flexible direct-current power grid polar line electric main wiring system and online maintenance method | |
| CN113178855B (en) | Medium-voltage radiation type bipolar direct-current power distribution system and method | |
| CN105391030A (en) | Planned island division method through load gradual loading and aggregation based on network topology structure | |
| CN109995016A (en) | A kind of DC distribution host's power configuration system and method for more power supplys | |
| CN113572189B (en) | Bipolar flexible direct current system for offshore wind power and transformer fault switching method thereof | |
| Larruskain et al. | Requirements for fault protection in HVDC grids | |
| CN104065156A (en) | Parallel cross input wiring device of 2N power supply system | |
| US11588327B2 (en) | Safe and resilient energy distribution for a highly efficient microgrid | |
| CN110504670B (en) | Power supply system and power supply method of direct-current power distribution network | |
| CN203800696U (en) | Parallel intersection input wiring apparatus for 2N power supply system | |
| CN108649561B (en) | Power supply system | |
| RU117732U1 (en) | HIGH VOLTAGE DISTRIBUTION DEVICE | |
| CN107069444B (en) | Low-voltage contact distribution box with bypass bus | |
| CN211127173U (en) | Distributed power supply system for ship | |
| CN212277685U (en) | Multi-port direct current power supply system | |
| CN216056301U (en) | Intelligent power distribution control device and intelligent power distribution box | |
| CN220711145U (en) | Parallel-to-off-grid switching circuit of energy storage inverter, energy storage inverter and photovoltaic energy storage system | |
| CN210404746U (en) | Bus-tie interval capable of realizing interconnection of three buses | |
| CN214255090U (en) | Power supply system of nuclear power station | |
| CN110768324B (en) | Distributed power supply system for ship, control method and storage medium | |
| CN212784383U (en) | 9 way output modularization aviation block terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |