CN110601273A - Three-terminal flexible direct-current power distribution network topology system - Google Patents
Three-terminal flexible direct-current power distribution network topology system Download PDFInfo
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- CN110601273A CN110601273A CN201910785933.9A CN201910785933A CN110601273A CN 110601273 A CN110601273 A CN 110601273A CN 201910785933 A CN201910785933 A CN 201910785933A CN 110601273 A CN110601273 A CN 110601273A
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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Abstract
The invention discloses a three-end flexible direct-current power distribution network topological system which comprises a three-end alternating-current power distribution system, three direct-current lines and four public direct-current buses, wherein a first alternating-current power distribution system in the three-end alternating-current power distribution system is connected with a first direct-current line in the three direct-current lines through a first public direct-current bus in the four public direct-current buses; a second alternating current distribution system in the three-terminal alternating current distribution system is connected with a second direct current line in the three direct current lines through a second common direct current bus in the four common direct current buses; and a third alternating current distribution system in the three-terminal alternating current distribution system is connected with a third direct current line in the three direct current lines through a third common direct current bus in the four common direct current buses. By adopting the system, the reliability and the universality of the power distribution network are improved through multi-point medium-voltage access, wider range and larger capacity access supporting new energy, energy storage and load.
Description
Technical Field
The invention belongs to the technical field of power electronic control, and particularly relates to a three-terminal flexible direct-current power distribution network topology system.
Background
The DC power distribution system exchanges energy with the AC system through the current converters, so that the voltage source current converters at all ends can supply power to the DC system, and the rest voltage source current converters can maintain the normal operation of the system when one (or two) of the voltage source current converters quit operation. Meanwhile, the change of the operation mode can be caused by the disconnection of a line and the exit of part of controllable equipment in the direct current power distribution system. Therefore, in order to ensure the power supply reliability of the load in the distribution network, the system needs to perform quick and smooth switching on the control modes of each controllable end to meet the current operation state when the grid structure or the operation condition changes.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a three-terminal flexible direct-current power distribution network topology system, wherein three power distribution network systems in the power distribution network topology system mutually provide support, and the reliability of the system is improved.
In view of this, the present invention provides a three-terminal flexible dc power distribution grid topology system, which adopts the following technical solutions:
a three-terminal flexible DC distribution network topology system comprises a three-terminal AC distribution system, three DC lines and four public DC buses, wherein,
a first alternating current distribution system in the three-terminal alternating current distribution system is connected with a first direct current line in the three direct current lines through a first common direct current bus in the four common direct current buses;
a second alternating current distribution system in the three-terminal alternating current distribution system is connected with a second direct current line in the three direct current lines through a second common direct current bus in the four common direct current buses;
a third alternating current distribution system in the three-terminal alternating current distribution system is connected with a third direct current line in the three direct current lines through a third common direct current bus in the four common direct current buses;
the three direct current lines are connected with the fourth common direct current bus in a ring network shape.
Further, the first alternating current distribution system, the second alternating current distribution system and the third alternating current distribution system comprise an alternating current distribution network, an alternating current switch and a voltage source type converter, and the alternating current switch is connected between the alternating current distribution network and the voltage source type converter.
Further, the first common direct current bus, the second common direct current bus and the third common direct current bus can be connected with one or more low-voltage direct current lines.
Further, the three direct current lines, the voltage source type converter and the one or more low-voltage direct current lines are all connected to the common direct current bus through direct current breakers.
Further, the first direct current line, the second direct current line and the third direct current line are all medium-voltage direct current lines with the voltage of +/-10 kv.
Further, the low-voltage direct-current line is a 400V low-voltage direct-current line.
Further, the low voltage dc line has an interface to connect one or more of a photovoltaic device, an energy storage device, and a dc charging post, a load device.
Furthermore, the one or more low-voltage direct-current lines and the corresponding alternating-current power distribution system are connected to the corresponding public direct-current bus in a ring network shape.
The 10kV power distribution network in the three-end flexible direct-current power distribution network topological system adopts a multi-source and multi-load netted structure, has outstanding demonstration significance and advancement, and is the development trend of a direct-current medium-voltage power distribution network; the 400V-level circuit in the system can realize high-efficiency access of source, storage and charging, and has high reliability; furthermore, the access capability can be accessed through multipoint medium-voltage access, new energy support, energy storage, larger range of load and larger capacity; in the aspect of power grid control, the power grid can coordinate and control sources, storage, charging and use, flexible multidirectional interaction of source load and storage can be supported, and finally high-end application can be realized, wherein scheduling of resources such as sources, storage, charging and use can be realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a three-terminal flexible dc distribution grid topology system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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.
The embodiment of the invention discloses a three-end flexible direct-current power distribution network topological system which comprises a three-end alternating-current power distribution system, three direct-current lines and four public direct-current buses, wherein a first alternating-current power distribution system in the three-end alternating-current power distribution system is connected with a first direct-current line in the three direct-current lines through a first public direct-current bus in the four public direct-current buses; a second alternating current distribution system in the three-terminal alternating current distribution system is connected with a second direct current line in the three direct current lines through a second common direct current bus in the four common direct current buses; and a third alternating current distribution system in the three-terminal alternating current distribution system is connected with a third direct current line in the three direct current lines through a third common direct current bus in the four common direct current buses. The three direct current lines are connected with the fourth common direct current bus in a ring network shape.
In the embodiment of the invention, the power distribution network of the startup building is taken as an example for illustration, but the invention is not limited to the power supply of the building, and other power distribution networks can all use the three-terminal flexible direct-current power distribution network topology system of the invention.
As shown in fig. 1, a first ac distribution system in the three-terminal flexible dc power distribution grid topology system includes a tang ac distribution network, an ac switch, and a first voltage source converter, wherein the ac switch is connected between the tang ac distribution network and the first voltage source converter, and the first voltage source converter is connected to a first dc line through a first common dc bus, wherein the first dc line has a length of 5km (kilometer). The second alternating current power distribution system comprises a chicken mountain station 1 bus alternating current distribution network, an alternating current switch and a second voltage source type current converter, wherein the alternating current switch is connected between the chicken mountain station 1 bus alternating current distribution network and the second voltage source type current converter, and the second voltage source type current converter is connected with a second direct current line through a second public direct current bus. Wherein the length of the second direct current line is less than 1km (kilometer). The third alternating current distribution system comprises a 2-bus alternating current distribution network of the chicken mountain station, an alternating current switch and a third voltage source type converter, wherein an alternating current line is further connected between the 2-bus alternating current distribution network of the chicken mountain station and the alternating current switch, the alternating current switch is connected between the 2-bus alternating current distribution network of the chicken mountain station and the third voltage source type converter, and the third voltage source type converter is connected with a third direct current line through a third common direct current bus; wherein the AC line is less than 500m (meters). The chicken mountain station 1 mother, the chicken mountain station 2 mother and the Tangjia communication distribution network in the embodiment of the invention are only exemplary illustrations, and other communication distribution networks are all suitable for the system of the invention.
In this embodiment, the first voltage source converter, the second voltage source converter and the third voltage source converter may have a capacity of 5MVA (mega volt ampere), but are not limited to the capacity of 5MVA (mega volt ampere), and other capacities may be configured according to the power distribution network. The three-terminal flexible direct current interconnection is realized by connecting the 3 converters with the common direct current bus, the three stations can provide power support mutually, and the reliability is high.
The first direct current line, the second direct current line and the third direct current line are all +/-10 kV (kilovolt) medium-voltage direct current lines, and the first direct current line, the second direct current line and the third direct current line are all connected to a fourth common direct current bus. The 10kV (kilovolt) medium-voltage direct-current line is connected in a star shape with three ends, a multi-source and multi-load net structure is presented, the demonstration significance and the advancement are prominent, and the development trend of a direct-current medium-voltage power grid is shown. And the outgoing line and the incoming line of the first public direct current bus, the second public direct current bus and the third public direct current bus are all connected with the direct current circuit breaker so as to ensure the safe operation of the distribution line.
More specifically, in fig. 1, the second common dc bus is a capital dc of a building, and the capital dc of the building is further connected with two 400V (volt) low-voltage dc lines, one of the low-voltage dc lines is connected with a load device with a capacity of 1MW (megawatt), and the other low-voltage dc line is connected with a photovoltaic device with a capacity of 2MW (megawatt). In addition, the third public direct current bus is an AB seat direct current main bus, the AB seat direct current main bus is further connected with three 400V (volt) low-voltage direct current lines, and the three low-voltage direct current lines are respectively connected with photovoltaic and energy storage equipment with the capacity of 1.5MW (megawatt), alternating current load equipment with the capacity of 2MW (megawatt) and charging station equipment with the capacity of 1MW (megawatt). The 400V (volt) low-voltage direct current lines are connected to the common direct current bus through direct current breakers. Preferably, a plurality of interfaces can be arranged on the low-voltage direct-current line to meet the power supply requirement, so that the low-voltage direct-current line adopts a ring network structure and is very high in reliability.
When the system is adopted for power supply, when any one line fails, the distribution network is split into radial distribution networks to operate, and the load is supplied by a single line, so that the coordinated control of power supply is ensured, and the normal power supply of a power distribution network system is ensured.
It should be noted that the term "connected" as used herein refers to a logical relationship for current transmission, and does not necessarily refer to a direct electrical connection unless otherwise specified. Meanwhile, "first", "second", and the like in the present invention do not indicate a sort of order but merely identify relevant units, devices, and the like.
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 (8)
1. A three-terminal flexible DC distribution network topology system is characterized in that the system comprises a three-terminal AC distribution system, three DC lines and four public DC buses, wherein,
a first alternating current distribution system in the three-terminal alternating current distribution system is connected with a first direct current line in the three direct current lines through a first common direct current bus in the four common direct current buses;
a second alternating current distribution system in the three-terminal alternating current distribution system is connected with a second direct current line in the three direct current lines through a second common direct current bus in the four common direct current buses;
a third alternating current distribution system in the three-terminal alternating current distribution system is connected with a third direct current line in the three direct current lines through a third common direct current bus in the four common direct current buses;
the three direct current lines are connected with the fourth common direct current bus in a ring network shape.
2. The three-terminal flexible dc power distribution grid topology system of claim 1, wherein said first ac power distribution system, said second ac power distribution system, and said third ac power distribution system each comprise an ac distribution network, an ac switch, and a voltage source converter, said ac switch being connected between said ac distribution network and said voltage source converter.
3. The three-terminal flexible dc power distribution grid topology system of claim 2, wherein said first, second, and third common dc buses are capable of connecting to one or more low voltage dc lines.
4. The three-terminal flexible dc power distribution grid topology system of claim 3, wherein said three dc lines, said voltage source converter, said one or more low voltage dc lines are all connected to said common dc bus by a dc breaker.
5. The three-terminal flexible dc power distribution grid topology system according to any of claims 1-4, wherein said first dc link, said second dc link, and said third dc link are all medium voltage dc links of ± 10 kv.
6. The three-terminal flexible dc distribution grid topology system of claim 2, wherein said low voltage dc link is a 400V low voltage dc link.
7. The three-terminal flexible dc power distribution grid topology system of claim 6, wherein said low voltage dc link has an interface to connect one or more of photovoltaic devices, energy storage devices, and dc charging piles, load devices.
8. The three-terminal flexible dc distribution grid topology system according to any of claims 1-4, 6-7, wherein said one or more low voltage dc lines are looped with their corresponding ac distribution system to said corresponding common dc bus.
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