CN112542839A

CN112542839A - Electric power system structure

Info

Publication number: CN112542839A
Application number: CN202011443206.3A
Authority: CN
Inventors: 张安龙
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-03-23

Abstract

The invention proposes a power system structure including a first substation and a second substation; the first substation includes a first three-winding transformer, a second three-winding transformer, a third three-winding transformer, a 220kV bus, a first 110kV bus, The second 110kV busbar, the first 10kV busbar, the second 10kV busbar, and the third 10kV busbar; the second substation includes the first double-winding transformer, the second double-winding transformer, the third double-winding transformer, the third 110kV bus, the third The fourth 110kV busbar, the fourth 10kV busbar, the fifth 10kV busbar, the sixth 10kV busbar, the seventh 10kV busbar, and the eighth 10kV busbar; use traditional transmission lines to achieve 110kV voltage level transmission, and use superconducting cable lines to achieve 10kV voltage level Power transmission, effectively solve the problem of urban power grid expansion and capacity expansion.

Description

Electric power system structure

Technical Field

The invention relates to the technical field of electric power, in particular to an electric power system structure.

Background

With the continuous acceleration of the urbanization process in China, the power consumption is increased rapidly, and the pressure of network expansion and capacity expansion is increasingly prominent. The urban underground pipe network is numerous, the cable laying space is extremely limited, under the condition that the construction land is increasingly tense, the traditional expansion mode of increasing loops is adopted, the construction cost is extremely expensive, and even the implementation is difficult. In order to meet the requirement of urban high-density power supply, the Shenzhen Fu field region is connected with a superconducting cable. The high-temperature superconducting cable has the advantages of low line loss, large transmission capacity, small corridor occupation area, environmental friendliness and the like, provides an efficient, compact, reliable and green electric energy transmission mode for a power grid, and provides an effective way for solving the problem of network expansion and capacity increase of an urban power grid.

Disclosure of Invention

The invention aims to provide a power system structure, which combines superconducting cable power transmission and traditional power transmission to realize power transmission between multiple main transformers of two transformer substations and solve the problem of network expansion and capacity increase of an urban power grid.

In order to achieve the above object, an embodiment of the present invention provides an electrical power system structure, including a first substation and a second substation; the first transformer substation comprises a first three-winding transformer, a second three-winding transformer, a third three-winding transformer, a 220kV bus, a first 110kV bus, a second 110kV bus, a first 10kV bus, a second 10kV bus and a third 10kV bus; the second transformer substation comprises a first double-winding transformer, a second double-winding transformer, a third 110kV bus, a fourth 10kV bus, a fifth 10kV bus, a sixth 10kV bus, a seventh 10kV bus and an eighth 10kV bus;

the high-voltage sides of the first three-winding transformer, the second three-winding transformer and the third three-winding transformer are connected with a 220kV bus; the medium-voltage side of the second three-winding transformer is connected with a first 110kV bus; the medium voltage sides of the first three-winding transformer and the third three-winding transformer are connected with a second 110kV bus; the low-voltage side of the first three-winding transformer is connected with a first 10kV bus; the low-voltage side of the second three-winding transformer is connected with a second 10kV bus; the low-voltage side of the third winding transformer is connected with a third 10kV bus; the third 10kV bus is connected to a corresponding load through a 10kV feeder;

the first 110kV bus is connected with a third 110kV bus through a first power transmission line; the second 110kV bus is connected with a fourth 110kV bus through a second power transmission line; the third 10kV bus is connected with an eighth 10kV bus through a superconducting cable; the eighth 10kV bus is connected to a corresponding load through a 10kV feeder;

the high-voltage side of the first double-winding transformer is connected with a third 110kV bus, and the low-voltage side of the first double-winding transformer is connected with a fourth 10kV bus; the high-voltage side of the second double-winding transformer is connected with a fourth 110kV bus, and the low-voltage side of the second double-winding transformer is respectively connected with a fifth 10kV bus and a sixth 10kV bus; and the high-voltage side of the third double-winding transformer is connected with a fourth 110kV bus, and the low-voltage side of the third double-winding transformer is connected with a fifth 10kV bus.

The first 10kV bus and the second 10kV bus are connected with the first interconnection breaker through a first interconnection line.

And the third 10kV bus is connected to the ground through a first reactor.

And the seventh 10kV bus is connected to the ground through a second reactor.

And the fourth 10kV bus and the fifth 10kV bus are connected with a second contact breaker through a second contact wire.

And the sixth 10kV bus and the seventh 10kV bus are connected with a third network breaker through a third network.

And the seventh 10kV bus and the eighth 10kV bus are connected with a fourth connecting circuit breaker through a fourth connecting line.

And the fourth 10kV bus and the eighth 10kV bus are connected with a fifth connecting circuit breaker through a fifth connecting line.

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, 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 the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electrical power system according to an embodiment of the present invention.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In addition, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means have not been described in detail so as not to obscure the present invention.

Referring to fig. 1, an embodiment of the present invention provides an electrical power system structure, including a first substation and a second substation; the first transformer substation comprises a first three-winding transformer #11, a second three-winding transformer #12, a third three-winding transformer #13, a 220kV bus, a first 110kV bus, a second 110kV bus, a first 10kV bus 1M, a second 10kV bus 2M and a third 10kV bus 3M; the second transformer substation comprises a first double-winding transformer #21, a second double-winding transformer #22, a third double-winding transformer #23, a third 110kV bus 3M, a fourth 110kV bus 4M, a fourth 10kV bus 4M, a fifth 10kV bus 5M, a sixth 10kV bus 6M, a seventh 10kV bus 7M and an eighth 10kV bus 8M;

the high-voltage sides of the first three-winding transformer #11, the second three-winding transformer #12 and the third three-winding transformer #13 are all connected with the same 220kV bus; the medium-voltage side of the first three-winding transformer is connected with a second 110kV bus through a circuit breaker B1 and a line; the medium-voltage side of the second three-winding transformer #12 is connected with a first 110kV bus through a circuit breaker B2 and a line; the medium-voltage side of the third winding transformer #13 is connected with a second 110kV bus through a circuit breaker B3 and a line; the low-voltage side of the first three-winding transformer #11 is connected with a first 10kV bus 1M through a circuit breaker B4 and a line; the low-voltage side of the second third winding transformer #12 is connected with a second 10kV bus 2M through a circuit breaker B5 and a line; the low-voltage side of the third winding transformer #13 is connected with a third 10kV bus 3M through a circuit breaker B6 and a line;

the first 110kV bus is connected with a third 110kV bus through a first power transmission line; the second 110kV bus is connected with a fourth 110kV bus through a second power transmission line; the third 10kV bus is connected with an eighth 10kV bus through a superconducting cable; the eighth 10kV bus is connected to a corresponding load through a 10kV feeder; circuit breakers B7 and B8 are arranged on two sides of the first line respectively; two sides of the second line are respectively provided with a breaker B9 and a breaker B10; two sides of the superconducting cable are respectively provided with a breaker B11 and a breaker B12;

the high-voltage side of the first double-winding transformer #21 is connected with a third 110kV bus through a circuit breaker B13 and a line, and the low-voltage side of the first double-winding transformer #21 is connected with a fourth 10kV bus through a circuit breaker B14 and a line;

the high-voltage side of the second double-winding transformer #22 is connected with a fourth 110kV bus through a circuit breaker B15 and a line, and the low-voltage side of the second double-winding transformer #22 is connected with a fifth 10kV bus 5M through a circuit breaker B16 and a line and connected with a sixth 10kV bus 6M through a circuit breaker B17 and a line;

the high-voltage side of the third double-winding transformer #23 is connected with a fourth 110kV bus through a circuit breaker B18 and a line, and the low-voltage side of the third double-winding transformer #23 is connected with a fifth 10kV bus 5M through a circuit breaker B19 and a line;

the first 10kV bus 1M and the second 10kV bus 2M are connected with a first interconnection breaker L1 through a first interconnection line.

The third 10kV bus 3M is connected to the ground through a first reactor D1.

The seventh 10kV bus 7M is connected to the ground through a second reactor D2.

The fourth 10kV bus 4M and the fifth 10kV bus 5M are connected with a second tie line and a second tie breaker L2.

The sixth 10kV bus 6M and the seventh 10kV bus 7M are connected with a third network breaker L3 through a third tie line.

And the seventh 10kV bus 7M and the eighth 10kV bus 8M are connected with a fourth connecting breaker L4 through a fourth connecting line.

And the fourth 10kV bus 4M and the eighth 10kV bus 8M are connected with a fifth tie breaker L5 through a fifth tie line.

The first 10kV bus 1M, the second 10kV bus 2M, the third 10kV bus 3M, the fourth 110kV bus 4M, the fourth 10kV bus 4M, the fifth 10kV bus 5M, the sixth 10kV bus 6M, the seventh 10kV bus 7M and the eighth 10kV bus 8M can all supply power to corresponding 10kV loads through feeders.

Specifically, in this embodiment, the first substation and the second substation are both multiple main substations, 110kV voltage level power transmission is realized by using a conventional power transmission line, 10kV voltage level power transmission is realized by using a superconducting cable line, and the method is suitable for improvement and optimization on the basis of the conventional multiple main substation power transmission line, and effectively solves the problem of network expansion and capacity expansion of an urban power grid.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A power system structure, characterized in that it includes a first substation and a second substation; the first substation includes a first three-winding transformer, a second three-winding transformer, a third three-winding transformer, a 220kV bus, a first three-winding transformer, and a first three-winding transformer. 110kV busbar, second 110kV busbar, first 10kV busbar, second 10kV busbar, third 10kV busbar; the second substation includes a first double-winding transformer, a second double-winding transformer, a third double-winding transformer, and a third 110kV Busbar, fourth 110kV busbar, fourth 10kV busbar, fifth 10kV busbar, sixth 10kV busbar, seventh 10kV busbar, eighth 10kV busbar;

The high-voltage sides of the first three-winding transformer, the second three-winding transformer, and the third three-winding transformer are connected to the 220kV bus; the medium-voltage side of the second three-winding transformer is connected to the first 110kV bus; the first three-winding transformer The medium voltage side of the third three-winding transformer is connected to the second 110kV bus; the low-voltage side of the first three-winding transformer is connected to the first 10kV bus; the low-voltage side of the second three-winding transformer is connected to the second 10kV bus; the The low voltage side of the third winding transformer is connected to the third 10kV busbar; the third 10kV busbar is connected to the corresponding load through the 10kV feeder;

The first 110kV busbar is connected to the third 110kV busbar through the first transmission line; the second 110kV busbar is connected to the fourth 110kV busbar through the second transmission line; the third 10kV busbar is connected to the eighth 10kV busbar through a superconducting cable; The eighth 10kV busbar is connected to the corresponding load through the 10kV feeder;

The high-voltage side of the first double-winding transformer is connected to the third 110kV busbar, and the low-voltage side is connected to the fourth 10kV busbar; the high-voltage side of the second double-winding transformer is connected to the fourth 110kV busbar, and the low-voltage side is respectively connected to the fifth 10kV busbar and the fourth 10kV busbar. Six 10kV busbars; the high voltage side of the third dual-winding transformer is connected to the fourth 110kV busbar, and the low voltage side is connected to the fifth 10kV busbar.

2 . The power system structure according to claim 1 , wherein the first 10kV busbar and the second 10kV busbar are connected through a first tie line and a first tie breaker. 3 .

3. The power system structure of claim 2, wherein the third 10kV busbar is connected to ground through a first reactor.

4. The power system structure of claim 3, wherein the seventh 10kV busbar connection is grounded through a second reactor.

5 . The power system structure according to claim 4 , wherein the fourth 10kV busbar and the fifth 10kV busbar are connected through a second tie line and a second tie breaker. 6 .

6 . The power system structure according to claim 5 , wherein the sixth 10kV busbar and the seventh 10kV busbar are connected through a third tie line and a third tie breaker. 7 .

7 . The power system structure according to claim 6 , wherein the seventh 10kV busbar and the eighth 10kV busbar are connected through a fourth tie line and a fourth tie breaker. 8 .

8 . The power system structure according to claim 7 , wherein the fourth 10kV busbar and the eighth 10kV busbar are connected through a fifth tie line and a fifth tie breaker. 9 .