A power distribution equipment layout system for substation expansion

Abstract

This invention provides a power distribution layout system for the expansion of a substation, comprising: an existing substation power distribution layout system including two sets of target voltage busbars, wherein the existing substation power distribution layout system adopts a fully outdoor open-type power distribution device; and a circuit breaker string connected to the two sets of target voltage busbars in the existing substation power distribution layout system, wherein the circuit breaker string includes both a fully outdoor open-type power distribution device and a gas-insulated switchgear power distribution device; the circuit breaker string is located between the two strings in the existing substation power distribution layout system. The solution of this invention can maintain the same main electrical wiring configuration between the expanded wind farm collection station and the original substation, and ensure the reliability of power supply after the expansion.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a power distribution equipment layout system for the expansion of a booster station. Background Technology

[0002] A certain project requires the expansion of a wind farm collection station into the existing 500kV substation of a thermal power plant.

[0003] The thermal power plant has a step-up substation with a voltage level of 500kV, connected to the main transformer incoming lines of four thermal power generating units (main transformers #1 to #4) and two 500kV system outgoing lines (outgoing line #1 and outgoing line #2). The main electrical wiring of the 500kV system uses a one-and-a-half-circuit breaker connection, with the #1 main transformer incoming line and #2 outgoing line, the #2 main transformer incoming line and #1 outgoing line, and the #3 main transformer incoming line and #4 main transformer incoming line each forming a complete wiring string. The 500kV switchgear adopts a fully outdoor open-type switchgear (AIS) with a double-row circuit breaker arrangement.

[0004] The expansion of the 500kV substation requires the placement of two main transformers, 500kV distribution equipment, 220kV distribution equipment, 66kV distribution equipment, reactive power compensation capacitors (reactors), etc., within the expansion site reserved for the original power plant's step-up substation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a power distribution equipment layout system for the expansion of a booster station, which can maintain the same electrical main wiring form between the expanded wind farm collection station and the original booster station, and ensure the reliability of power supply after the expansion.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A power distribution equipment layout system for substation expansion includes: The original substation power distribution equipment layout system includes two sets of target voltage busbars, and the original substation power distribution equipment layout system adopts a fully outdoor open-type power distribution equipment. The circuit breaker string is connected to the busbars of two target voltages in the existing substation power distribution system. The circuit breaker string includes an all-outdoor open-type power distribution device and a gas-insulated switchgear power distribution device. The circuit breaker string is located between the two strings in the existing substation power distribution system.

[0007] Optionally, the circuit breaker wiring string includes: A first gas-insulated switchgear distribution unit connected to the busbar of the first target voltage group; A first fully outdoor open-type power distribution unit connected to the first gas-insulated switchgear power distribution unit; The first transformer connected to the first fully outdoor open-type power distribution unit; The second gas-insulated switchgear distribution unit is connected to the busbar of the second target voltage; A second fully outdoor open-type power distribution unit connected to the second gas-insulated switchgear power distribution unit; A second transformer connected to the second fully outdoor open-type power distribution unit; The third gas-insulated switchgear power distribution unit.

[0008] Optionally, the first end of the third gas-insulated switchgear distribution device is connected to the connecting wire between the first gas-insulated switchgear distribution device and the first fully outdoor open-type distribution device; the second end of the third gas-insulated switchgear distribution device is connected to the connecting wire between the second gas-insulated switchgear distribution device and the second fully outdoor open-type distribution device.

[0009] Optionally, any one of the first gas-insulated switchgear power distribution device, the second gas-insulated switchgear power distribution device, and the third gas-insulated switchgear power distribution device includes: The first disconnecting switch, the first grounding switch, the first current transformer, the circuit breaker, the second current transformer, the second grounding switch, and the second disconnecting switch are connected in sequence.

[0010] Optionally, the first disconnecting switch in the first gas-insulated switchgear distribution device is connected to the busbar of the first group of target voltages, and the second disconnecting switch in the first gas-insulated switchgear distribution device is connected to the first fully outdoor open-type distribution device.

[0011] Optionally, the first disconnecting switch in the second gas-insulated switchgear distribution device is connected to the busbar of the second group of target voltages, and the second disconnecting switch in the second gas-insulated switchgear distribution device is connected to the second fully outdoor open-type distribution device.

[0012] Optionally, the first disconnecting switch in the third gas-insulated switchgear distribution device is connected to the connecting wire between the first gas-insulated switchgear distribution device and the first fully outdoor open-type distribution device, and the second disconnecting switch in the third gas-insulated switchgear distribution device is connected to the connecting wire between the second gas-insulated switchgear distribution device and the second fully outdoor open-type distribution device.

[0013] Optionally, either the first fully outdoor open-type power distribution unit or the second fully outdoor open-type power distribution unit includes: The third current transformer, the third grounding switch, the third disconnecting switch, the fast grounding switch, the live indicator, and the voltage transformer are connected in sequence.

[0014] Optionally, the third current transformer in the first fully outdoor open-type power distribution device is connected to the second disconnecting switch in the first gas-insulated switchgear power distribution device via a connecting wire, and the voltage transformer in the first fully outdoor open-type power distribution device is connected to the first transformer via a connecting wire.

[0015] Optionally, the third current transformer in the second fully outdoor open-type power distribution device is connected to the second disconnecting switch in the second gas-insulated switchgear power distribution device via a connecting wire, and the voltage transformer in the second fully outdoor open-type power distribution device is connected to the second transformer via a connecting wire.

[0016] The above-described solution of the present invention has at least the following beneficial effects: The above-described solution of the present invention utilizes an existing substation power distribution system, which includes two sets of target voltage busbars and employs a fully outdoor open-type power distribution system. A circuit breaker string is connected to the two target voltage busbars in the existing substation power distribution system. This circuit breaker string includes both a fully outdoor open-type power distribution system and a gas-insulated switchgear power distribution system. The circuit breaker string is located between two strings in the existing substation power distribution system. This ensures that the electrical main wiring configuration of the expanded wind farm collection station is the same as that of the original substation, and guarantees the reliability of power supply after the expansion. Attached Figure Description

[0017] Figure 1 This is the electrical main wiring diagram of the power distribution equipment layout system for the expansion of the substation according to an embodiment of the present invention; Figure 2 This is a plan view of the layout system of the power distribution equipment for the expansion of the substation according to an embodiment of the present invention; Figure 3 This is a first cross-sectional view of the layout system of the power distribution equipment for the expansion of the substation according to an embodiment of the present invention; Figure 4 This is a second cross-sectional view of the layout system of the power distribution equipment for the expansion of the substation according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 11. Busbar for the first group of target voltages; 12. Busbar for the second group of target voltages; 21. First gas-insulated switchgear distribution unit; 22. Second gas-insulated switchgear distribution unit; 23. Third gas-insulated switchgear distribution unit; 31. First fully outdoor open-type distribution unit; 32. Second fully outdoor open-type distribution unit; 41. First transformer; 42. Second transformer; 51. First disconnecting switch; 52. First grounding switch; 53. First current transformer; 54. Circuit breaker; 55. Second current transformer; 56. Second grounding switch; 57. Second disconnecting switch; 61. Third current transformer; 62. Third grounding switch; 63. Third disconnecting switch; 64. Fast grounding switch; 65. Live indicator; 66. Voltage meter. Detailed Implementation

[0018] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0019] like Figure 1 As shown, an embodiment of the present invention proposes a power distribution equipment layout system for the expansion of a substation, comprising: The original substation power distribution equipment layout system includes two sets of target voltage busbars, and the original substation power distribution equipment layout system adopts a fully outdoor open-type power distribution equipment. The circuit breaker string is connected to the busbars of two target voltages in the existing substation power distribution system. The circuit breaker string includes an all-outdoor open-type power distribution device and a gas-insulated switchgear power distribution device. The circuit breaker string is located between the two strings in the existing substation power distribution system.

[0020] In this embodiment, the original substation power distribution equipment layout system is as follows: Figure 1 As shown outside the Chinese border, the expanded circuit breaker wiring string is as follows: Figure 1The content within the Chinese box is shown. The target voltage busbar can be of various voltage levels such as 110kV, 220kV, 330kV, and 500kV. The substation expansion distribution equipment layout system of this invention is applicable to various voltage levels such as 110kV, 220kV, 330kV, and 500kV. Taking 500kV as an example, this invention is for the subsequent expansion of a substation that has already adopted a 500kV fully outdoor open-type distribution device (AIS) layout into an electrical system using a 500kV gas-insulated switchgear distribution device (GIS). The existing substation power distribution system is connected to four main transformer incoming lines of thermal power generating units (main transformer incoming lines #1 to #4) and two 500kV system outgoing lines (outgoing line #1 and outgoing line #2). The main electrical wiring of the 500kV system adopts a one-and-a-half circuit breaker connection, wherein the main transformer incoming line #1 and outgoing line #2, the main transformer incoming line #2 and outgoing line #1, and the main transformer incoming line #3 and outgoing line #4 each form a complete string.

[0021] The expanded 500kV distribution equipment adopts a fully outdoor open-type distribution system (AIS) with a double-row circuit breaker arrangement. The expanded 500kV wind farm substation will have two newly built main transformers with a rated capacity of 1000MVA. The transformer turns ratio is 525 / 230±2x2.5% / 66kV. The two main transformers will form a complete circuit breaker string using a one-and-a-half-circuit breaker connection, connecting to the two 500kV busbars of the existing step-up substation distribution system, thus connecting the wind farm substation to the power grid system.

[0022] like Figure 1 As shown, the area outside the box is the existing layout of the substation, which uses a 500kV fully outdoor open-type switchgear (AIS) and includes the #3 and #4 main transformer incoming line bays. The area inside the box is reserved space with an axial dimension of approximately 60m × 194m, which will be used for the layout of the two newly built 1000MVA main transformers and 500kV switchgear at the 500kV wind farm collection station.

[0023] In an optional embodiment of the present invention, the circuit breaker wiring string includes: The first gas-insulated switchgear distribution unit 21 is connected to the bus 11 of the first target voltage; A first fully outdoor open-type power distribution unit 31 connected to the first gas-insulated switchgear power distribution unit 21; The first transformer 41 is connected to the first fully outdoor open-type power distribution unit 31; The second gas-insulated switchgear distribution unit 22 is connected to the busbar 12 of the second target voltage; The second fully outdoor open-type power distribution unit 32 is connected to the second gas-insulated switchgear power distribution unit 22; The second transformer 42 is connected to the second fully outdoor open-type power distribution unit 32; The third gas-insulated switchgear distribution device 23.

[0024] The first end of the third gas-insulated switchgear distribution device 23 is connected to the connecting wire between the first gas-insulated switchgear distribution device 21 and the first fully outdoor open-type distribution device 31; the second end of the third gas-insulated switchgear distribution device 23 is connected to the connecting wire between the second gas-insulated switchgear distribution device 22 and the second fully outdoor open-type distribution device 32.

[0025] Any one of the first gas-insulated switchgear distribution device 21, the second gas-insulated switchgear distribution device 22, and the third gas-insulated switchgear distribution device 23 includes: The first disconnecting switch 51, the first grounding switch 52, the first current transformer 53, the circuit breaker 54, the second current transformer 55, the second grounding switch 56, and the second disconnecting switch 57 are connected in sequence.

[0026] The first disconnecting switch 51 in the first gas-insulated switchgear distribution device 21 is connected to the bus 11 of the first group of target voltages, and the second disconnecting switch 57 in the first gas-insulated switchgear distribution device 21 is connected to the first fully outdoor open-type distribution device 31.

[0027] The first disconnecting switch 51 in the second gas-insulated switchgear distribution device 22 is connected to the bus 12 of the second group of target voltages, and the second disconnecting switch 57 in the second gas-insulated switchgear distribution device 22 is connected to the second fully outdoor open-type distribution device 32.

[0028] The first disconnecting switch 51 in the third gas-insulated switchgear distribution device 23 is connected to the connecting wire between the first gas-insulated switchgear distribution device 21 and the first fully outdoor open-type distribution device 31, and the second disconnecting switch 57 in the third gas-insulated switchgear distribution device 23 is connected to the connecting wire between the second gas-insulated switchgear distribution device 22 and the second fully outdoor open-type distribution device 32.

[0029] In this embodiment, the main wiring of the 500kV system of the expanded wind farm collection station project remains consistent with the main wiring of the original substation, still using a one-and-a-half-circuit breaker connection. The first transformer 41 and the second transformer 42 form a complete one-and-a-half-circuit breaker connection string connected to the first target voltage bus 11 and the second target voltage bus 12 of the original substation. Three circuit breakers are installed in the circuit breaker connection string. The circuit breakers 54 in the first gas-insulated switchgear distribution device 21 and the second gas-insulated switchgear distribution device 22 are connected to the two busbars, with an intermediate circuit breaker (i.e., the circuit breaker 54 in the third gas-insulated switchgear distribution device 23). The 500kV sides of the first transformer 41 and the second transformer 42 are electrically connected to the two circuit breakers 54 respectively, and the entire 500kV electrical system operates in a closed loop.

[0030] When any one of the circuit breakers 54 is under maintenance or malfunctions, the first transformer 41 and the second transformer 42 can still form an electrical path with at least one of the busbars without affecting normal operation.

[0031] When any one of the busbars is under maintenance or malfunctions, the first transformer 41 and the second transformer 42 can still form an electrical path with the other normal working busbar without affecting normal operation.

[0032] When any component (circuit breaker or busbar) in the electrical circuit is under maintenance or fails, the normal operation of the first transformer 41 and the second transformer 42 will not be affected, resulting in high operational reliability and a small power outage range.

[0033] In an optional embodiment of the present invention, either the first fully outdoor open-type power distribution device 31 or the second fully outdoor open-type power distribution device 32 includes: The third current transformer 61, the third grounding switch 62, the third disconnecting switch 63, the fast grounding switch 64, the live indicator 65, and the voltage transformer 66 are connected in sequence.

[0034] The third current transformer 61 in the first fully outdoor open-type power distribution device 31 is connected to the second disconnecting switch 57 in the first gas-insulated switchgear power distribution device 21 via a connecting wire, and the voltage transformer 66 in the first fully outdoor open-type power distribution device 31 is connected to the first transformer 41 via a connecting wire.

[0035] The third current transformer 61 in the second fully outdoor open-type power distribution device 32 is connected to the second disconnecting switch 57 in the second gas-insulated switchgear power distribution device 22 via a connecting wire, and the voltage transformer 66 in the second fully outdoor open-type power distribution device 32 is connected to the second transformer 42 via a connecting wire.

[0036] The above embodiments of the present invention employ a hybrid layout scheme of 500kV all-outdoor open-type switchgear (AIS) and gas-insulated metal-enclosed switchgear (GIS). The original layout of the AIS at the substation remains unchanged, and the main electrical wiring scheme of the expanded GIS remains consistent with the original substation. During expansion, the GIS for the wind farm collection station can be constructed while the original substation is normally energized. After installation, only a short-term alternating power outage of the two 500kV busbars (partial substation power outage) is required to complete the connection work for the two main transformers and the GIS. This reduces economic losses caused by power outage modifications while ensuring the reliability and flexibility of power supply after expansion. It is particularly suitable for the expansion (reconstruction) of existing thermal power plant substations into new energy collection stations, offering advantages such as flexible layout, land saving, reduced construction risks, and shorter construction periods.

[0037] The above embodiments of the present invention reduce the risk of electric shock during construction and installation operations, while realizing the function of the wind farm collection station and improving the flexibility and reliability of the collection station operation.

[0038] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power distribution equipment layout system for the expansion of a substation, characterized in that, include: The original substation power distribution equipment layout system includes two sets of target voltage busbars, and the original substation power distribution equipment layout system adopts a fully outdoor open-type power distribution equipment. The circuit breaker string is connected to the busbars of two target voltages in the existing substation power distribution system. The circuit breaker string includes an all-outdoor open-type power distribution device and a gas-insulated switchgear power distribution device. The circuit breaker string is located between the two strings in the existing substation power distribution system.

2. The substation expansion power distribution equipment layout system according to claim 1, characterized in that, The circuit breaker wiring string includes: The first gas-insulated switchgear distribution unit (21) is connected to the bus (11) of the first target voltage. A first fully outdoor open-type power distribution unit (31) connected to the first gas-insulated switchgear power distribution unit (21); The first transformer (41) is connected to the first fully outdoor open-type power distribution unit (31). The second gas-insulated switchgear distribution unit (22) is connected to the busbar (12) of the second target voltage. A second fully outdoor open-type power distribution unit (32) connected to the second gas-insulated switchgear power distribution unit (22); A second transformer (42) connected to the second fully outdoor open-type power distribution unit (32); The third gas-insulated switchgear distribution unit (23).

3. The substation expansion power distribution equipment layout system according to claim 2, characterized in that, The first end of the third gas-insulated switchgear distribution device (23) is connected to the connecting wire between the first gas-insulated switchgear distribution device (21) and the first fully outdoor open-type distribution device (31); the second end of the third gas-insulated switchgear distribution device (23) is connected to the connecting wire between the second gas-insulated switchgear distribution device (22) and the second fully outdoor open-type distribution device (32).

4. The substation expansion power distribution equipment layout system according to claim 2, characterized in that, Any one of the first gas-insulated switchgear distribution device (21), the second gas-insulated switchgear distribution device (22), and the third gas-insulated switchgear distribution device (23) includes: The first disconnecting switch (51), the first grounding switch (52), the first current transformer (53), the circuit breaker (54), the second current transformer (55), the second grounding switch (56), and the second disconnecting switch (57) are connected in sequence.

5. The substation expansion power distribution equipment layout system according to claim 4, characterized in that, The first disconnecting switch (51) in the first gas-insulated switchgear distribution device (21) is connected to the bus (11) of the first group of target voltages, and the second disconnecting switch (57) in the first gas-insulated switchgear distribution device (21) is connected to the first fully outdoor open-type distribution device (31).

6. The substation expansion power distribution equipment layout system according to claim 4, characterized in that, The first disconnecting switch (51) in the second gas-insulated switchgear distribution device (22) is connected to the bus (12) of the second group of target voltages, and the second disconnecting switch (57) in the second gas-insulated switchgear distribution device (22) is connected to the second fully outdoor open-type distribution device (32).

7. The substation expansion power distribution equipment layout system according to claim 4, characterized in that, The first disconnecting switch (51) in the third gas-insulated switchgear distribution device (23) is connected to the connecting wire between the first gas-insulated switchgear distribution device (21) and the first fully outdoor open-type distribution device (31), and the second disconnecting switch (57) in the third gas-insulated switchgear distribution device (23) is connected to the connecting wire between the second gas-insulated switchgear distribution device (22) and the second fully outdoor open-type distribution device (32).

8. The substation expansion power distribution equipment layout system according to claim 4, characterized in that, Either the first fully outdoor open-type power distribution unit (31) or the second fully outdoor open-type power distribution unit (32) includes: The third current transformer (61), the third grounding switch (62), the third disconnecting switch (63), the fast grounding switch (64), the live indicator (65), and the voltage transformer (66) are connected in sequence.

9. The substation expansion power distribution equipment layout system according to claim 8, characterized in that, The third current transformer (61) in the first fully outdoor open-type power distribution device (31) is connected to the second disconnector (57) in the first gas-insulated switchgear power distribution device (21) via a connecting wire, and the voltage transformer (66) in the first fully outdoor open-type power distribution device (31) is connected to the first transformer (41) via a connecting wire.

10. The substation expansion power distribution equipment layout system according to claim 8, characterized in that, The third current transformer (61) in the second fully outdoor open-type power distribution device (32) is connected to the second disconnecting switch (57) in the second gas-insulated switchgear power distribution device (22) via connecting wires, and the voltage transformer (66) in the second fully outdoor open-type power distribution device (32) is connected to the second transformer (42) via connecting wires.

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