A 50MW 110kV new energy step-up substation system

Abstract

The present invention discloses a 50MW 110kV new energy step-up substation system, which includes a 110kV distribution device, a main transformer, an outdoor GIS, an SVG step-down transformer / reactance, a high-voltage lightning arrester, a line PT, and a prefabricated cabin; the prefabricated cabin includes an SVG cabin, a grounding transformer cabin, a station service transformer and a 400V cabin, a 35kV cabin and a secondary equipment cabin; a 35kV distribution device is arranged in the 35kV cabin; a 400V distribution device and a station service transformer are arranged in the station service transformer and 400V cabin; a grounding transformer and a resistor complete set device are arranged in the grounding transformer cabin, SVG power and control equipment are arranged in the SVG cabin, and system protection equipment, system communication equipment, system dispatching automation equipment, an integrated automation system and component protection equipment are arranged in the secondary equipment cabin; the 110kV distribution device is connected to the main transformer, the main transformer is connected to the 35kV distribution device, the 35kV distribution device is connected to a reactive power compensation device, a grounding transformer and a resistor complete set device and a station service transformer, and this system realizes the standardization of the 50MW 110kV new energy step-up substation and has a small floor area at the same time.

Description

Technical Field

[0001] The invention belongs to the field of new energy wind power and photovoltaic power generation, and relates to a 50MW 110kV new energy booster station system. Background Art

[0002] Renewable energy power generation projects such as wind power and photovoltaic power generation usually consist of two parts: wind power / photovoltaic field and substation / boosting station. The electric energy generated by the new energy power generation device (wind turbine or photovoltaic module and inverter combination) in the field is boosted by the box transformer, and then connected to the supporting substation / boosting station through multiple 35kV collection lines for collection / boosting before being uniformly sent to the nearby power grid company substation to achieve grid connection of new energy electric energy.

[0003] 50MW 110kV new energy booster station is a relatively common booster station configuration for wind power, photovoltaic and other new energy power generation projects. The differences in the selection and layout design of the main equipment of each design unit have caused the specific forms of the current 50MW 110kV new energy booster station to be different, and standardized design cannot be achieved. The space occupied is large, which is not conducive to improving the efficiency of the owner's early station construction, and also brings inconvenience to the unified and intensive operation and maintenance management in the later stage. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a 50MW 110kV new energy booster station system, which effectively improves the construction efficiency of the 50MW 110kV new energy booster station.

[0005] To achieve the above-mentioned purpose, the 50MW 110kV new energy booster station system of the present invention includes a 110kV power distribution device, a main transformer, an outdoor GIS, an SVG step-down transformer, a high-voltage lightning arrester, a line PT and a prefabricated cabin; the prefabricated cabin includes an SVG cabin, a grounding transformer cabin, a station transformer and a 400V cabin, a 35kV cabin and a secondary equipment cabin;

[0006] The 35kV compartment is equipped with a 35kV power distribution device; the station transformer and 400V compartment are equipped with a 400V power distribution device and station transformer; the grounding transformer compartment is equipped with a grounding transformer and a resistor set, the SVG compartment is equipped with SVG power and control equipment, and the secondary equipment compartment is equipped with system protection equipment, system communication equipment, system dispatching automation equipment, integrated automation system and component protection equipment;

[0007] The 110kV distribution device is connected to the main transformer, the main transformer is connected to the 35kV distribution device, and the 35kV distribution device is connected to the reactive power compensation device, the grounding transformer and the resistance complete set and the station transformer.

[0008] Steel core aluminum stranded wire is used to connect the 110kV distribution device and the main transformer.

[0009] The main transformer is connected to the 35 kV distribution device by a fully insulated pipe bus.

[0010] The 35 kV distribution device is connected to the reactive power compensation device, grounding transformer and resistor complete set device, and station service transformer by cables.

[0011] The main transformer adopts an SZ11-50MVA / 110kV three-phase oil-immersed self-cooled on-load tap-changer transformer;

[0012] The 35 kV distribution device adopts indoor armored metal withdrawable air-insulated switchgear;

[0013] The reactive power compensation device adopts a ±12 MVar water-cooled step-down type SVG;

[0014] The grounding transformer adopts a 37 kV 630 kVA three-phase dry-type DKSC type;

[0015] The station service transformer adopts one 37±2x2.5% / 0.4 kV 250 kVA three-phase dry-type SCB11 type;

[0016] The 400 V compartment adopts 5 MNS type switchgear.

[0017] The 110 kV distribution device includes 1 outdoor GIS interval for line-transformer unit outgoing line, 1 set of external three-phase PTs and 2 sets of external lightning arresters.

[0018] The system protection equipment includes 1 line protection cabinet, 1 fault recorder cabinet, 1 protection and fault information management sub-station cabinet and 1 power grid security automatic device cabinet.

[0019] The system dispatching automation equipment includes 1 electric energy metering cabinet, 1 power quality on-line monitoring cabinet, 1 synchronized phasor measurement cabinet, 2 dispatching data network access equipment cabinets, 1 management information network cabinet, 1 wind / solar power prediction system cabinet, 1 secondary security equipment cabinet, 1 AGC / AVC control cabinet and 1 primary frequency regulation cabinet.

[0020] The system protection equipment includes 1 line protection cabinet, 1 fault recorder cabinet, 1 protection and fault information management sub-station cabinet and 1 power grid security automatic device cabinet.

[0021] The integrated automation system and component protection equipment include 2 sets of main computers and operator stations / engineer stations, 1 set of microcomputer five-prevention system, 1 remote control workstation cabinet, 1 network communication cabinet, 1 time synchronization cabinet, 1 110 kV line-transformer unit measurement and control cabinet, 1 common measurement and control cabinet, 1 PT transfer cabinet, 3 collector line protection and measurement and control devices, 2 station transformer / earthing transformer protection and measurement and control devices, 1 SVG outgoing line protection and measurement and control device, 1 35 kV bus measurement and control device, 2 interval layer industrial Ethernet switches, 7 35 kV energy meters, 1 set of audible alarm device, 2 printers, 1 main transformer protection cabinet, 1 35 kV bus protection cabinet and 1 relay protection test power supply panel;

[0022] The DC and UPS equipment includes a DC system and a UPS. Among them, the DC system is configured with 2 chargers and 2 batteries, and the UPS is configured with dual-machine redundancy.

[0023] The present invention has the following beneficial effects:

[0024] When the 50 MW 110 kV new energy step-up substation system of the present invention is specifically operated, a prefabricated cabin method is adopted to achieve standard design. Among them, it includes 110 kV distribution equipment, main transformer, outdoor GIS, SVG step-down transformer / reactors, high-voltage lightning arresters and line PTs, as well as prefabricated cabins; the prefabricated cabins include SVG cabins, earthing transformer cabins, station transformers and 400 V cabins, 35 kV cabins and secondary equipment cabins, so as to improve space utilization rate, and at the same time significantly improve the construction efficiency of the 50 MW 110 kV new energy step-up substation, and facilitate the owner unit to carry out intensive operation and maintenance management for all power stations of the same type within the group. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the schematic diagram of the present invention.

[0026] Among them, 1 is the SVG cabin, 2 is the SVG step-down transformer, 3 is the outdoor GIS, 4 is the main transformer, 5 is the earthing transformer cabin, 6 is the fully insulated pipe bus, 7 is the 35 kV cabin, 8 is the station transformer and 400 V cabin, 9 is the secondary equipment cabin. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present invention disclosed. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessarily confusing the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present invention.

[0028] The structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are only exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] Referring to Figure 1 , the 50MW 110kV new energy step-up substation system described in the present invention includes a 110kV distribution device, a main transformer 4, an outdoor GIS 3, an SVG step-down transformer / reactance 2, a high-voltage arrester, a line PT 10, and a prefabricated cabin; the prefabricated cabin includes an SVG cabin 1, a grounding transformer cabin 5, a station service transformer and 400V cabin 8, a 35kV cabin 7, and a secondary equipment cabin 9;

[0030] A 35kV distribution device is arranged in the 35kV cabin 7; a 400V distribution device and a station service transformer are arranged in the station service transformer and 400V cabin 8; a grounding transformer and a resistor complete set device are arranged in the grounding transformer cabin 5; SVG power and control equipment are arranged in the SVG cabin 1; system protection equipment, system communication equipment, system dispatching automation equipment, an integrated automation system, and component protection equipment are arranged in the secondary equipment cabin 9;

[0031] The second-layer cabin includes a 35kV cabin 7, a station service transformer and 400V cabin 8, and a secondary equipment cabin 9;

[0032] The 110kV distribution device is connected to the main transformer 4 by a steel-core aluminum stranded wire, the main transformer 4 is connected to the 35kV distribution device by a fully insulated pipe bus 6, and the 35kV distribution device is connected to the reactive power compensation device, the grounding transformer, and the station service transformer by cables.

[0033] The 110kV distribution device uses overhead outgoing lines.

[0034] The main transformer 4 is a 50MVA 110 / 35kV on-load tap-changing step-up main transformer;

[0035] The 110kV distribution device includes 1 outdoor GIS interval for line-transformer unit outgoing line, 1 group of external three-phase PTs, and 2 groups of external arresters.

[0036] The main transformer 4 adopts an SZ11-50MVA / 110kV three-phase oil-immersed self-cooled on-load tap-changing transformer, with a voltage ratio of 115±8x1.25% / 37kV, a wiring group of YN,d11, and an impedance voltage of 10.5%.

[0037] The 110 kV power distribution device includes 1 outdoor GIS bay for line-transformer unit outgoing line, 1 set of external three-phase PTs, and 2 sets of external lightning arresters. The rated voltage of the 110 kV power distribution device is 126 kV, the rated current is 2000 A, the thermal stability current is 40 kA (3 s), and the dynamic stability current is 100 kA.

[0038] The 35 kV power distribution device uses indoor armored metal withdrawable air-insulated switchgear. The rated voltage of the 35 kV power distribution device is 40.5 kV, the rated current is 2000 A, the thermal stability current is 31.5 kA (4 s), and the dynamic stability current is 80 kA.

[0039] The reactive power compensation device uses a ±12 MVar water-cooled step-down type SVG;

[0040] The grounding transformer uses a 37 kV 630 kVA three-phase dry-type DKSC type, and the supporting grounding resistance value is 71.2 ohms;

[0041] The station service transformer uses 1 three-phase dry-type SCB11 type of 37 ± 2x2.5% / 0.4 kV 250 kVA;

[0042] The construction and standby transformer selects 1 three-phase oil-immersed S11 type of 10 ± 2x2.5% / 0.4 kV 250 kVA;

[0043] The 400 V compartment uses 5 MNS type switchgear cabinets.

[0044] The system protection equipment includes 1 line protection cabinet, 1 fault recorder cabinet, 1 protection and fault information management sub-station cabinet, and 1 grid security automatic device cabinet.

[0045] The system dispatching automation equipment includes 1 electric energy metering cabinet, 1 power quality on-line monitoring cabinet, 1 synchronous phasor measurement cabinet, 2 dispatching data network access equipment cabinets, 1 management information network cabinet, 1 wind / solar power prediction system cabinet, 1 secondary security equipment cabinet, 1 AGC / AVC control cabinet, and 1 primary frequency modulation cabinet configuration.

[0046] The system protection equipment includes 1 line protection cabinet, 1 fault recorder cabinet, 1 protection and fault information management sub-station cabinet, and 1 grid security automatic device cabinet configuration.

[0047] The integrated automation system and component protection equipment include 2 sets of main computers and operator stations / engineer stations, 1 set of microcomputer five-prevention system, 1 remote control workstation cabinet, 1 network communication cabinet, 1 time synchronization cabinet, 1 110 kV line-transformer unit measurement and control cabinet, 1 common measurement and control cabinet, 1 PT transfer cabinet, 3 collector line protection and measurement and control devices, 2 station transformer / earthing transformer protection and measurement and control devices, 1 SVG outgoing line protection and measurement and control device, 1 35 kV busbar measurement and control device, 2 industrial Ethernet switches at the interval layer, 7 35 kV energy meters, 1 set of audible alarm device, 2 printers, 1 main transformer protection cabinet, 1 35 kV busbar protection cabinet and 1 relay protection test power supply panel configuration.

[0048] In the DC system of the DC and UPS equipment, it is configured with 2 chargers and 2 batteries, adopting a single-bus sectionalized wiring. The capacity of each battery group is 250 Ah. The communication power is taken from the station DC system. The UPS in the DC and UPS equipment is configured with dual-machine redundancy, with a capacity of 2 x 10 kVA.

[0049] The design schemes of the electrical main connection and equipment selection in the step-up substation are shown in Table 1 below.

[0050] Table 1

[0051]

[0052]

[0053]

Claims

1. A 50MW 110kV new energy step-up substation system, characterized in that, It includes a 110 kV distribution device, a main transformer (4), an outdoor GIS (3), an SVG step-down transformer (2), a high-voltage lightning arrester and a line PT (10), and a prefabricated cabin; the prefabricated cabin includes an SVG cabin (1), a grounding transformer cabin (5), a station service transformer and 400 V cabin (8), a 35 kV cabin (7), and a secondary equipment cabin (9); A 35 kV distribution device is arranged in the 35 kV cabin (7); a 400 V distribution device and a station service transformer are arranged in the station service transformer and 400 V cabin (8); a grounding transformer and a resistor complete set device are arranged in the grounding transformer cabin (5), SVG power and control equipment are arranged in the SVG cabin (1), and system protection equipment, system communication equipment, system dispatching automation equipment, an integrated automation system, and component protection equipment are arranged in the secondary equipment cabin (9); The 110 kV distribution device is connected to the main transformer (4), the main transformer (4) is connected to the 35 kV distribution device, and the 35 kV distribution device is connected to a reactive power compensation device, a grounding transformer and a resistor complete set device, and a station service transformer; The 110 kV distribution device and the main transformer (4) are connected by a steel-core aluminum stranded wire; The main transformer (4) and the 35 kV distribution device are connected by a fully insulated pipe bus (6).

2. The 50MW 110kV new energy step-up substation system according to claim 1, characterized in that, The 35 kV distribution device and the reactive power compensation device, the grounding transformer and the resistor complete set device, and the station service transformer are connected by a cable.

3. The 50MW 110kV new energy step-up substation system according to claim 1, characterized in that, The main transformer (4) adopts an SZ11-50MVA / 110kV three-phase oil-immersed self-cooled on-load tap-changing transformer; The 35 kV distribution device adopts an indoor armored metal withdrawable air-insulated switchgear cabinet; The reactive power compensation device adopts a ±12 MVar water-cooled step-down type SVG; The grounding transformer adopts a 37 kV 630 kVA three-phase dry-type DKSC type; The station service transformer adopts 1 set of 37±2x2.5% / 0.4kV 250 kVA three-phase dry-type SCB11 type; The 400 V cabin adopts 5 MNS type switchgear cabinets.

4. The 50MW 110kV new energy step-up substation system according to claim 1, characterized in that, The 110 kV distribution device includes 1 outdoor GIS interval for line-transformer unit outgoing line, 1 set of external three-phase PTs, and 2 sets of external lightning arresters.

5. The 50MW 110kV new energy step-up substation system according to claim 1, characterized in that, The system protection equipment includes 1 line protection cabinet, 1 fault recorder cabinet, 1 protection and fault information management sub-station cabinet, and 1 grid security automatic device cabinet.

6. The 50MW 110kV new energy step-up substation system according to claim 1, characterized in that, The system dispatching automation equipment includes 1 electric energy metering cabinet, 1 power quality on-line monitoring cabinet, 1 synchronous phasor measurement cabinet, 2 dispatching data network access equipment cabinets, 1 management information network cabinet, 1 wind / solar power prediction system cabinet, 1 secondary security equipment cabinet, 1 AGC / AVC control cabinet, and 1 primary frequency modulation cabinet.

7. The 50MW 110kV new energy step-up substation system according to claim 1, wherein, The system protection equipment includes 1 line protection cabinet, 1 fault recorder cabinet, 1 protection and fault information management sub-station cabinet, and 1 grid security automatic device cabinet.

8. The 50MW 110kV new energy step-up substation system according to claim 1, characterized in that, The integrated automation system and component protection equipment include 2 sets of main computers and operator stations / engineer stations, 1 set of microcomputer five-prevention system, 1 remote control workstation cabinet, 1 network communication cabinet, 1 time synchronization cabinet, 1 110 kV line-transformer unit measurement and control cabinet, 1 common measurement and control cabinet, 1 PT transfer cabinet, 3 collector line protection and measurement and control devices, 2 station transformer / earthing transformer protection and measurement and control devices, 1 SVG outgoing line protection and measurement and control device, 1 35 kV bus measurement and control device, 2 industrial Ethernet switches at the interval layer, 7 35 kV watt-hour meters, 1 set of audio alarm device, 2 printers, 1 main transformer protection cabinet, 1 35 kV bus protection cabinet and 1 relay protection test power supply panel; The DC and UPS equipment includes the DC system and UPS. Among them, the DC system is configured with 2 chargers and 2 batteries, and the UPS is configured with dual-machine redundancy.

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