CN202210685U

CN202210685U - Large-scale wind power plant step-up transformer system

Info

Publication number: CN202210685U
Application number: CN201120303845XU
Authority: CN
Inventors: 郑海涛; 王辉君; 王利平; 程明
Original assignee: GANSU PROV ELECTRIC POWER DESIGN INST
Current assignee: Co Ltd Of Chinese Energy Construction Group Gansu Prov Electric Power Design Inst
Priority date: 2011-08-19
Filing date: 2011-08-19
Publication date: 2012-05-02
Anticipated expiration: 2021-08-19

Abstract

A large-scale wind power plant step-up transformer system is provided. The system comprises 35kV box type transformer influx lines, each 35kV box type transformer influx line is connected with 11 to 12 35kV influx cables in parallel, each 35kV influx cable is connected with a 0.69kV/35kV box type step-up transformer, and the low voltage side of each 0.69kV/35kV box type step-up transformer is connected with a blower fan with wind power voltage of 0.69kV through a low voltage cable, and each 35kV box type transformer influx line is connected with a 35kV influx bus. The system is characterized in that the number of the 35kV box type transformer influx lines is 12 to 14, the 35kV influx bus is connected with the low voltage side of the 35kV/330kV set-up transformer, and the high voltage side of the 35kV/330kV set-up transformer is connected with a 330kV sending-out line through the 330kV influx bus. By adopting the system, wind power networking of large-scale wind power plants in the same area is realized through first level voltage conversion, a 35/330kV one-off step-up method is adopted, voltage is directly fluxed into a 30kV main network, power transformation loss is reduced, and power generation effects are increased.

Description

Large-scale wind electricity field step-up transformer system

Technical field

The utility model relates to wind power generation and technology of transmission of electricity field, belongs to the design of the large-scale wind electricity field being concentrated the wind energy turbine set step-up transformer of online zone proposition; Particularly a kind of large-scale wind electricity field step-up transformer system.

Background technology

The energy and environmental problem receive much concern current, generation of electricity by new energy technology such as wind power generation have obtained fast development as a kind of regenerative resource of cleaning in many countries.Along with progressively putting into operation of China each department each " ten million multikilowatt wind-powered electricity generation base ", select suitable wind-powered electricity generation online step-up transformer to have very important realistic meaning for saving investment, minimizing wind energy turbine set internal loss, increase power benefit.

The utility model content

The technical problem that the utility model will solve is to provide a kind of large-scale wind electricity field step-up transformer system; Carry the purpose of investment, minimizing power transformation loss, increase power benefit to realize the saving of large-scale wind electricity field.

The utility model solves the problems of the technologies described above; Adopt following technical scheme: a kind of large-scale wind electricity field step-up transformer system; Comprise that 35kV box type transformer (becoming hereinafter to be referred as case) compiles circuit; Every time 35kV case becomes to compile circuit and meet 11 to 12 35kV and compiles cable, and every 35kV compiles cable and connects the box step-up transformer of 0.69kV/35kV, and it is the blower fan of 0.69kV that the box step-up transformer low-pressure side of each 0.69kV/35kV connects a typhoon piezoelectric voltage through low-voltage cable; Every time 35kV case change compiles circuit and inserts the 35kV collection bus, it is characterized in that: it is 12 to 14 times that the change of 35kV case compiles circuit; The 35kV collection bus is connected to 35kV/330kV step-up transformer low-pressure side, and 35kV/330kV step-up transformer high-pressure side is seen circuit through the 330kV collection bus off with 330kV and is connected.

Said large-scale wind electricity field step-up transformer system comprises three or four 35kV/330kV step-up transformers, and three or four 35kV/330kV step-up transformer high-pressure sides are connected to the 330kV collection bus, and the 330kV collection bus is seen circuit off with 330kV and is connected.

Traditional to compile scheme be the wind-powered electricity generation that sends of blower fan through box boost become rise to the 35kV electric pressure after, boost to the 110kV electric pressure by the 110kV step-up transformer again, and then send into main electrical network through the 330kV step-up transformer.The utility model adopts boosting mode of 330/35kV; Reduced by an electric pressure, just reduced the one time power transformation investment, thereby reduced the booster stations of a series of 35/110kV; The one-time investment and the later stage operation expense of engineering have been saved; The whole system conversion efficiency is higher, can effectively reduce the power transformation loss, increases power benefit; Realize the wind-powered electricity generation online through the one-level voltage transformation,, cycle project of transmitting and converting electricity life-cycle is built have great significance for large-scale wind electricity field connecting system provides a kind of reliable economic again mode.China's development of large-scale wind electricity is from now on had the demonstration meaning, be particularly useful for large-scale wind electricity field, west area.

Description of drawings

Fig. 1 is a large-scale wind electricity field tradition step-up transformer system construction drawing,

Fig. 2 is the structure chart of the utility model under each large-scale wind electricity field installed capacity same case,

Fig. 3 is the structure chart of the utility model under each large-scale wind electricity field installed capacity different situations.

Among the figure: 1-large-scale wind electricity field 330kV sees circuit off, 2-330kV bus, 3-tradition scheme 110kV/330kV step-up transformer that boosts, 4-110kV collection bus; 5-35kV bus, the 6-tradition scheme 110kV that boosts compiles circuit, 7-tradition scheme 110kV bus that boosts, 8-tradition scheme 110kV step-up transformer that boosts; 9-35kV collection bus, the box step-up transformer of 10-0.69kV/35kV, 11-35kV case become compiles circuit; 12-35kV compiles cable, 13-low-voltage cable, 14-blower fan; 15-35kV/330kV step-up transformer, 1501-120MVA transformer, 1502-240MVA transformer.

Embodiment

Shown in Figure 1 is the wind energy turbine set tradition scheme of boosting; The wind energy turbine set group capacity is generally below 50,000 kW; It is the wind turbine generator of 1500kW that blower fan adopts single-machine capacity; The wind-powered electricity generation that every typhoon machine 14 sends, voltage are 0.69kV, after low-voltage cable 13 causes the box step-up transformer 10 of 35kV to boost to 35kV, compile cable 12 through 35kV and receive the 35kV case to become and compile on the circuit 11.Every time 35kV case change compiles circuit 11 and is with 11 ~ 12 typhoon machines; Each wind energy turbine set is compiled circuit 11 through 2 ~ 3 times 35kV case changes and is collected to 35kV collection bus 9 in the 110kV booster stations; Boost to 110kV through 110kV step-up transformer 8 and receive 110kV bus 7 in the 110kV booster stations; Compile the wind-powered electricity generation that circuit 6 sends out each wind-powered electricity generation place through 110kV afterwards and cause 330kV booster stations 110kV collection bus 4; After boosting to the 330kV electric pressure through 330kV step-up transformer 3, see circuit off through 330kV and import 330kV master's electrical network.

Fig. 2 is the boost scheme of the utility model under each large-scale wind electricity field installed capacity same case; A kind of large-scale wind electricity field step-up transformer system; Comprise that the 35kV box type transformer compiles circuit 11; Every time 35kV case becomes to compile circuit 11 and meet 11 to 12 35kV and compiles cable 12; Every 35kV compiles cable 12 and connects the box step-up transformer 10 of 0.69kV/35kV, and it is the blower fan 14 of 0.69kV that box step-up transformer 10 low-pressure sides of each 0.69kV/35kV connect a typhoon piezoelectric voltage through low-voltage cable 13; Every time 35kV case change compiles circuit 11 and inserts 35kV collection bus 9, it is characterized in that: it is 12 to 14 times that the change of 35kV case compiles circuit 11; 35kV collection bus 9 is connected to 35kV/330kV step-up transformer 15 low-pressure sides, and 35kV/330kV step-up transformer 15 high-pressure sides are seen circuit 1 through 330kV collection bus 2 off with 330kV and are connected.

See Fig. 2: this large-scale wind electricity field step-up transformer system, comprise that 15, three 35kV/330kV step-up transformer 15 high-pressure sides of three 35kV/330kV step-up transformers are connected to 330kV collection bus 2,330kV collection bus 2 is seen circuit 1 off with 330kV and is connected.The capacity of three 35kV/330kV step-up transformers 15 is identical, is 240MVA transformer 1502.

Large-scale wind energy turbine set step-up transformer system wind-powered electricity generation first stage of the project application of the utility model in area, Jiuquan.Being the 200MW level by the single large-scale wind electricity of Jiuquan local wind electricity first stage of the project field capacity considers.Wind-powered electricity generation compiles process and the wind energy turbine set tradition scheme basically identical that boosts by what wind turbine 14 was exported to 35kV collection bus 9; 12 ~ 14 times 35kV casees changes in each large-scale wind electricity field compile circuit 11 and are collected to 35kV collection bus 9 in the 330kV booster stations, and 35kV/330kV step-up transformer first class boost to the 330kV electric pressure through the utility model imports 330kV master's electrical network after 330kV sees circuit off afterwards.

The scheme of boosting of the utility model has been cancelled the 35/110/330kV tradition power transformation link in the scheme of boosting; Compare with the tradition scheme of boosting; Save a large amount of 110kV booster stations power transformation investment and 110kV and compiled track investment; Saved the operation and maintenance cost of equipment, for the traffic control of electric power system brings great convenience, 35kV/330kV two winding step-up transformers also can reduce the power transformation investment than the tradition scheme 330kV three winding self coupling step-up transformers that boost simultaneously.Compile line loss though the scheme of boosting of the utility model has increased part 35 kV, significantly reduced the one time power transformation loss, it is higher totally to compile efficient.

Fig. 3 is the boost scheme of the utility model under each large-scale wind electricity field installed capacity different situations; This large-scale wind electricity field step-up transformer system; Comprise four 35kV/330kV step-up transformers 15; Four 35kV/330kV step-up transformers 15 are connected to 330kV collection bus 2, and 330kV collection bus 2 is seen circuit 1 off with 330kV and is connected.The scheme of boosting of Fig. 3 is applicable to the situation that four tame owners undertake the construction of, and wherein has two tame owners to undertake the construction of 200MW level wind energy turbine set respectively, and other two tame owners have undertaken the construction of 100MW level wind energy turbine set respectively.Divide and operational management for the ease of assets, interior 2 the 120MVA step-up transformers 1501 of installing of 330kV booster stations and 1502,2 120MVA step-up transformers 1501 of 2 240MVA step-up transformers compile two 100MW level wind-powered electricity generation places respectively and send out wind-powered electricity generation.The process of boosting of this scheme wind energy turbine set is said consistent with Fig. 2, only is the capacity to 330kV step-up transformer in the different corresponding adjustment 330kV booster stations of the capacity of wind energy turbine set.Consider that existing power supply characteristic has part throttle characteristics again in the running of wind energy turbine set, so the main tapping rated voltage of 35kV/330kV step-up transformer 15 is designed to 345 ± 8 * 1.25%/35kV; Both guaranteed the power supply characteristic when the wind-powered electricity generation safety economy is incorporated into the power networks, the power demands in the time of also can reasonably solving fan starting simultaneously.

The 0.69Kv/35kV step-up transformer of single wind energy turbine set adopts the YN/d11 mode of connection; Each box step-up transformer wiring group adopts the D/yn11 mode of connection.

Claims

1. large-scale wind electricity field step-up transformer system; Comprise that the 35kV box type transformer compiles circuit; Every time 35kV case becomes to compile circuit and meet 11 to 12 35kV and compiles cable; Every 35kV compiles cable and connects the box step-up transformer of 0.69kV/35kV, and it is the blower fan of 0.69kV that the box step-up transformer low-pressure side of each 0.69kV/35kV connects a typhoon piezoelectric voltage through low-voltage cable; Every time 35kV case change compiles circuit and inserts the 35kV collection bus, it is characterized in that: it is 12 to 14 times that the change of 35kV case compiles circuit; The 35kV collection bus is connected to 35kV/330kV step-up transformer low-pressure side, and 35kV/330kV step-up transformer high-pressure side is seen circuit through the 330kV collection bus off with 330kV and is connected.

2. a kind of large-scale wind electricity as claimed in claim 2 field step-up transformer system; It is characterized in that: said large-scale wind electricity field step-up transformer system comprises three or four 35kV/330kV step-up transformers; Three or four 35kV/330kV step-up transformers are connected to the 330kV collection bus, and the 330kV collection bus is seen circuit off with 330kV and is connected.

3. according to claim 1 or claim 2 a kind of large-scale wind electricity field step-up transformer system, it is characterized in that: the main tapping rated voltage of 35kV/330kV step-up transformer is designed to 345 ± 8 * 1.25%/35kV.