CN102664407A - Method and system for designing boosting transformer of new energy electric field - Google Patents
Method and system for designing boosting transformer of new energy electric field Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention belongs to a design scheme of a boosting transformer which is provided aiming at a concentrated grid-connected electric field of a large-scale wind power station, a large-scale photovoltaic power station and the like, and particularly relates to a method and a system for designing a boosting transformer of a new energy electric field. The method comprises the following steps of: boosting voltage of an outlet of a draught fan or a photovoltaic power generation unit to 35 kV or 35 kV or 10 kV by a box type boosting transformer; and then, boosting the voltage of the outlet of the box type boosting transformer from 35 kV or 10 kV to 330 kV or 220 kV or 110 kV voltage grade matched with a power grid through a three-winding main boosting transformer, and conveying into a main power grid. A 35-kV side of the main boosting transformer is changed into a Y-type wiring; an arc suppression coil or a grounding resistor can be directly connected with a 35-kV side neutral point to cancel a grounding transformer needing by a two-winding boosting scheme, the investment is saved and the occupied area is saved; a 10-kV angular wiring winding is additionally arranged to improve the stability of the system; one voltage grade is added to provide the possibility of mixing and collecting two voltage grades of 35 kV and 10 kV for the new energy electric field; and the scheme is optimized and collected according to an actual configuration condition of the new energy electric field.
Description
Technical field
The present invention relates to generation of electricity by new energy and technology of transmission of electricity field, belong to the design of the step-up transformer that proposes to the concentrated electric field that is incorporated into the power networks such as large-scale wind electricity field, large-sized photovoltaic power station; Particularly a kind of new forms of energy electric field step-up transformer method for designing and system.
Background technology
The energy and environmental problem receive much concern current, generation of electricity by new energy technology such as wind power generation, photovoltaic generation have obtained fast development as a kind of regenerative resource of cleaning in many countries.Along with progressively putting into operation of grid type wind-powered electricity generation, photovoltaic base concentrated in China each department; Select suitable grid type step-up transformer for improving fail safe, the reliability that the new forms of energy electric field is incorporated into the power networks; Practice thrift investment, reduce the wind energy turbine set internal loss, increase power benefit, have very important realistic meaning.
Summary of the invention
The technical problem one of which that the present invention will solve is to provide a kind of large-scale new forms of energy electric field master step-up transformer method for designing, and it two is to provide a kind of large-scale new forms of energy electric field booster system; To improve the security and stability of large-scale new forms of energy electric field operation, realize practicing thrift the purpose that conveying was invested, reduced the power transformation loss, increases power benefit.
The present invention solves above-mentioned first technical problem; Adopt following technical scheme: a kind of large-scale new forms of energy electric field master step-up transformer method for designing; Comprise blower fan or photovoltaic generation unit outlet voltage after box step-up transformer rises to 35kV or 35kV and 10 kV, through one three winding master step-up transformer box step-up transformer is exported again and send into main electrical network after voltage rises to the 330kV that is complementary with electrical network or 220kV or 110kV electric pressure by 35kV or 10kV; Specifically comprise the steps:
A. select large-scale new forms of energy electric field master step-up transformer electric pressure and connection type
A.1 the large-scale new forms of energy electric field of the same area adopts three winding master step-up transformers; Its electric pressure is 330/35/10kV; Wind energy turbine set or photovoltaic plant electric energy import three winding master step-up transformers 35kV or according to the electric field installed capacity and compile the distance import 35kV and 10kV side respectively, after three winding master step-up transformers boost to 330kV, incorporate the 330kV electrical network into; Main step-up transformer connection type adopts YN/yn0/d11;
A.2 the large-scale new forms of energy electric field of the same area adopts three winding master step-up transformers; Its electric pressure is 220/35/10kV; Wind energy turbine set or photovoltaic plant electric energy import three winding master step-up transformers 35kV or according to the electric field installed capacity and compile the distance import 35kV and 10kV side respectively, after three winding master step-up transformers boost to 220kV, incorporate the 220kV electrical network into; Main step-up transformer connection type adopts YN/yn0/d11;
A.3 the large-scale new forms of energy electric field of the same area adopts three winding master step-up transformers; Its electric pressure is 110/35/10kV; Wind energy turbine set or photovoltaic plant electric energy import three winding master step-up transformers 35kV or according to the electric field installed capacity and compile the distance import 35kV and 10kV side respectively, after main step-up transformer boosts to 110 kV, incorporate the 110kV electrical network into; Main step-up transformer connection type adopts YN/yn0/d11;
B. design large-scale wind electricity field step-up transformer main tapping rated voltage
B.1 corresponding with steps A .1, large-scale centralized grid type new forms of energy electric field master step-up transformer main tapping rated voltage is chosen as 345 kV ± 8 * 1.25%/35 kV/10.5kV;
B.2 corresponding with steps A .2, large-scale centralized grid type new forms of energy electric field master step-up transformer main tapping rated voltage is chosen as 230 kV ± 8 * 1.25%/35 kV/10.5kV;
B.3 corresponding with steps A .3, large-scale centralized grid type new forms of energy electric field master step-up transformer main tapping rated voltage is chosen as 121 kV ± 8 * 1.25%/35 kV/10.5kV;
Consider that existing power supply characteristic has part throttle characteristics again in the running of new forms of energy electric field, therefore recommending large-scale new forms of energy electric field step-up transformer main tapping rated voltage is 345kV ± 8 * 1.25%/35 kV/10.5kV or 230 kV ± 8 * 1.25%/35 kV/10.5kV or 121 ± 8 * 1.25%/35 kV/10.5kV; Both guaranteed the power supply characteristic when new forms of energy electric field safety economy is incorporated into the power networks, the power demands in the time of also can reasonably solving fan starting simultaneously.
C. the box step-up transformer connection type of large-scale new forms of energy electric field
It is that to compile the box step-up transformer connection type of the 10kV of system be D/yn11 for YN/d11 or new forms of energy electric field 10kV that new forms of energy electric field 35kV compiles the box step-up transformer connection type of the 35kV of system.
Because single large-scale new forms of energy electric field adopts the main step-up transformer of three windings, the YN/yn0/d11 mode of connection, then corresponding 35kV or the box step-up transformer connection type of 10 kV need be adjusted so that main step-up transformer matches.
Method provided by the invention is with the beneficial effect that traditional two windings, 330 kV/35kV, the main step-up transformer of YN/d11 wiring are compared:
1, main step-up transformer 35kV side changes the wiring of Y type into, advantage is that arc suppression coil or earth resistance can directly be connected on the 35kV side neutral point, has cancelled two grounding transformers that need adopt around the scheme of boosting, and practices thrift investment and floor space;
2, increase 10kV angle scheme winding, advantage is: the first, for zero sequence and harmonic current provide circulation channel, reduced blower fan, the large-scale current transformer in photovoltaic generation unit harmonic pollution to public network, and improved the stability of a system; The second, can select dynamic reactive compensation device is installed in the 10kV side, cancellation 35/10kV system interconnection transformer has been offset the additional investment of three-winding transformer on cost; The 3rd, increased an electric pressure, for providing two kinds of electric pressures of a kind of 35kV, 10kV, the new forms of energy electric field mixes the possibility of compiling, compile scheme according to the actual arrangement situation optimization of new forms of energy electric field, practice thrift and compile track investment.
For 330kV or 220kV or the 110kV electric pressure that wind-powered electricity generation or the integrated and main electrical network of photovoltaic remittance are complementary; The present invention solves above-mentioned second technical problem, adopts following three kinds of technical schemes arranged side by side:
One of which, a kind of large-scale new forms of energy electric field booster system comprises main step-up transformer; Dynamic reactive compensation device; Arc suppression coil or earth resistance, 330kV sees circuit off, the 330kV collection bus; Several 35kV compile circuit; Every 35kV compiles circuit and meets many 35kV and compiles cable, and every 35kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 35kV compiles circuit and is connected to the 35kV collection bus; It is characterized in that: main step-up transformer is three winding 330/35/10kV master step-up transformers; The 35kV collection bus is connected with the 35kV winding of three winding 330/35/10kV master step-up transformers; Dynamic reactive compensation device is connected through the 10kV winding of 10kV bus with three winding 330/35/10kV master step-up transformers, and arc suppression coil or earth resistance are connected with the 35kV neutral point of three winding 330/35/10kV master step-up transformers; Main step-up transformer high-pressure side is connected to 330 kV collection bus.
Its two, a kind of large-scale new forms of energy electric field booster system comprises main step-up transformer; Dynamic reactive compensation device; Arc suppression coil or earth resistance, 220kV sees circuit off, the 220kV collection bus; Several 35kV compile circuit; Every 35kV compiles circuit and meets many 35kV and compiles cable, and every 35kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 35kV compiles circuit and is connected to the 35kV collection bus; It is characterized in that: main step-up transformer is three winding 220/35/10kV master step-up transformers; The 35kV collection bus is connected with the 35kV winding of three winding 220/35/10kV master step-up transformers; Dynamic reactive compensation device is connected through the 10kV winding of 10kV bus with three winding 220/35/10kV master step-up transformers, and arc suppression coil or earth resistance are connected with the 35kV neutral point of three winding 220/35/10kV master step-up transformers; Main step-up transformer high-pressure side is connected to the 220kV collection bus.
Its three, a kind of large-scale new forms of energy electric field booster system comprises main step-up transformer; Dynamic reactive compensation device; Arc suppression coil or earth resistance, 110kV sees circuit off, the 110kV collection bus; Several 35kV compile circuit; Every 35kV compiles circuit and meets many 35kV and compiles cable, and every 35kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 35kV compiles circuit and is connected to the 35kV collection bus; It is characterized in that: main step-up transformer is three winding 110/35/10kV master step-up transformers; The 35kV collection bus is connected with the 35kV winding of three winding 110/35/10kV master step-up transformers; Dynamic reactive compensation device is connected through the 10kV winding of 10kV bus with three winding 110/35/10kV master step-up transformers, and arc suppression coil or earth resistance are connected with the 35kV neutral point of three winding 110/35/10kV master step-up transformers; Main step-up transformer high-pressure side is connected to the 110kV collection bus.
For the different wind energy turbine set or photovoltaic electric field of installed capacity; With 330kV master's electrical network is example; Large-scale new forms of energy electric field booster system of the present invention also has: several 10kV compile circuit; Every 10kV compiles circuit and meets many 10kV and compiles cable; Every 10kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 10kV compiles circuit and connects the 10kV collection bus, and the 10kV collection bus is connected with the 10kV winding of three winding 330/35/10kV master step-up transformers.
Traditional scheme of boosting be the electric energy that sends of blower fan or photovoltaic generation unit after box step-up transformer rises to 35kV, insert corresponding electrical network after boosting to 330kV or 220 kV or 110kV by two winding master step-up transformers again.
Electrical network with 330kV is an example, and booster system provided by the invention is characterised in that adopting connection type is that YN/yn0/d11, electric pressure are the three winding step-up transformers of 330/35/10kV.Compare with traditional boosting mode, advantage is:
First; Main step-up transformer 35kV side adopts the wiring of Y type, and 35kV compiles 1/ √ 3 that system's phase voltage is reduced to the angle scheme phase voltage, effectively reduces and compiles system's overvoltage level; Extinguishing arc capacity when having reduced to compile system's single-phase earthing has improved the security and stability of system's operation;
Second; Main step-up transformer increases the 10kV winding of angle scheme, and the one, kept original booster system advantage, for zero sequence and harmonic current provide circulation channel; Reduced blower fan, solar cell large-scale current transformer harmonic pollution, guaranteed the stability of a system public network; The 2nd, the new forms of energy electric field can with 35 and two kinds of electric pressures of 10kV be collected in the main step-up transformer, low-pressure side, can optimize the new forms of energy electric field and compile scheme, practice thrift the investment of new forms of energy electric field self; The 3rd, reactive power compensator is installed in the 10kV side; Realized compiling the isolation of system with 35kV; The capacitance current that reactive-load compensation equipment provides does not take the extinguishing arc capacity, has improved the arc extinguishing success rate when 35kV compiles system's generation single-phase fault, has increased the operational reliability of new forms of energy electric fields.
The present invention provides a kind of reliable economic again new departure for large-scale new forms of energy electric field connecting system; The construction of cycle project of transmitting and converting electricity life-cycle is had great significance; China's large-scale from now on new forms of energy electricity base development is had the demonstration meaning, be particularly useful for the large-scale new forms of energy electric field in west area.
Description of drawings
Fig. 1 is large-scale new forms of energy electric field tradition step-up transformer system construction drawing,
Fig. 2 is a step-up transformer system construction drawing of the present invention under each large-scale new forms of energy electric field installed capacity same case,
Fig. 3 is a step-up transformer system construction drawing of the present invention under each large-scale new forms of energy electric field installed capacity different situations.
Among the figure: 1-330kV sees circuit off, or 220kV sees circuit off, or 110kV sees circuit off; 2-330kV collection bus, or 220kV collection bus, or 110kV collection bus; 3-35kV/330kV master step-up transformer, or 35kV/220kV master's step-up transformer, or 35kV/110kV master's step-up transformer; 4-35kV collection bus; The box step-up transformer of 5-0.69/35kV, or the box step-up transformer of 0.27/35kV; 6-blower fan, or photovoltaic generation unit; 7-35kV grounding transformer, 8-35/10kV system interconnection transformer, 9-dynamic reactive compensation device, 10-arc suppression coil or earth resistance, 11-three winding master step-up transformers, 12-10kV collection bus, 13-35kV compiles circuit, and 14-10kV compiles circuit.
Embodiment
Shown in Figure 1 is the new forms of energy electric field tradition scheme of boosting, and inserting the 330kV electrical network with the new forms of energy electric field is example:
The electric energy that wind-powered electricity generation unit 6 sends; Voltage is 0.69kV, or the electric energy that sends of photovoltaic generation unit 6, and voltage is 0.27kV; Be connected to box step-up transformer 5 of 0.69/35kV or the box step-up transformer 5 of 0.27/35kV through low-voltage cable; Boost to 35kV after some times 35kV compile circuit 13 and are connected to 35kV collection bus 4 in the booster stations, after 330/35kV master's step-up transformer 3 boosts, receive 330kV collection bus 2, see circuit 1 off through 330kV again and import the 330kV electrical network.The 35kV side of 330/35kV master's step-up transformer 3 of new forms of energy electric field is drawn neutral point after arc suppression coil or earth resistance 10 ground connection through grounding transformer 7 conversion connection types; When the new forms of energy electric field adopts 10kV dynamic reactive compensation device 9; Adopt 35/10kV system interconnection transformer 8 to obtain the 10kV electric pressures, with dynamic reactive compensation device 9 and be connected to 35/10kV system interconnection transformer 10kV side.
Inserting the 220kV electrical network with the new forms of energy electric field is example: the voltage that wind-powered electricity generation unit 6 sends is the 0.69kV electric energy; Or the voltage that photovoltaic generation unit 6 sends is the electric energy of 0.27kV; Be connected to box step-up transformer 5 of 0.69/35kV or the box step-up transformer 5 of 0.27/35kV through low-voltage cable; Boost to 35kV after some times 35kV compile circuit 13 and are connected to 35kV collection bus 4 in the booster stations; After 220/35kV master's step-up transformer 3 boosts, receive 220kV collection bus 2, see circuit 1 off through 220kV again and import the 220kV electrical network.
Equally; Inserting the 110kV electrical network with the new forms of energy electric field is example: wind-powered electricity generation unit 6 sends the electric energy that voltage is 0.69kV; Or the voltage that photovoltaic generation unit 6 sends is the electric energy of 0.27kV; Be connected to box step-up transformer 5 of 0.69/35kV or the box step-up transformer 5 of 0.27/35kV through low-voltage cable; Boost to 35kV after some times 35kV compile circuit 13 and are connected to 35kV collection bus 4 in the booster stations, after 110/35kV master's step-up transformer 3 boosts, receive 110kV collection bus 2, see circuit 1 off through 110kV again and import the 110kV electrical network.
The common ground of above-mentioned three embodiment is that arc suppression coil or earth resistance 10 directly are connected on the main step-up transformer 11 medium voltage side neutral points, and dynamic reactive compensation device 9 directly and connect the 10kV side of main step-up transformer 11.Cancel new forms of energy electric field tradition boost employed grounding transformer of scheme 7 and reactive power compensation system interconnection transformer 8, saved the operation and maintenance cost of equipment.In addition, it is Y type wiring system that 35kV compiles system, has reduced system's phase voltage, has reduced system's overvoltage level, and lectotype selection all can be selected according to phase voltage, has reduced simultaneously and has compiled system failure probability.
Fig. 3 for the present invention in each large-scale new forms of energy electric field installed capacity with compile apart from the scheme of boosting under the different situations; Being collected to 330kV master's electrical network with wind-powered electricity generation or photovoltaic electricity is example; Referring to Fig. 3: large-scale new forms of energy electric field booster system of the present invention also has: several 10kV compile circuit 14; Every 10kV compiles circuit 14 and meets many 10kV and compiles cable; Every 10kV compiles cable and connects a 0.69/35kV or the box step-up transformer 5 of 0.27/35kV, and box step-up transformer 5 low-pressure sides of each 0.69/35kV or 0.27/35kV are through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 10kV compiles circuit and connects 10kV collection bus 12, and 10kV collection bus 12 is connected with the 10kV winding of three winding 330/35/10kV master step-up transformers.All the other are identical with embodiment 1.
Fig. 3 represented equally the present invention each large-scale new forms of energy electric field installed capacity and compile apart under the different situations, wind-powered electricity generation or photovoltaic electricity be collected to the scheme of boosting of 220kV master's electrical network; Large-scale new forms of energy electric field booster system also has: several 10kV compile circuit 14; Every 10kV compiles circuit 14 and meets many 10kV and compiles cable; Every 10kV compiles cable and connects a 0.69/35kV or the box step-up transformer 5 of 0.27/35kV, and box step-up transformer 5 low-pressure sides of each 0.69/35kV or 0.27/35kV are through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 10kV compiles circuit and connects 10kV collection bus 12, and 10kV collection bus 12 is connected with the 10kV winding of three winding 220/35/10kV master step-up transformers.All the other are identical with embodiment 2.
Fig. 3 represented equally the present invention each large-scale new forms of energy electric field installed capacity and compile apart under the different situations, wind-powered electricity generation or photovoltaic electricity be collected to the scheme of boosting of 110kV master's electrical network; Large-scale new forms of energy electric field booster system also has: several 10kV compile circuit 14; Every 10kV compiles circuit 14 and meets many 10kV and compiles cable; Every 10kV compiles cable and connects a 0.69/35kV or the box step-up transformer 5 of 0.27/35kV, and box step-up transformer 5 low-pressure sides of each 0.69/35kV or 0.27/35kV are through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 10kV compiles circuit and connects 10kV collection bus 12, and 10kV collection bus 12 is connected with the 10kV winding of three winding 110/35/10kV master step-up transformers.All the other are identical with embodiment 3.
Blower fan or the photovoltaic generation unit 6 that embodiment 4,5 and 6 common ground are the new forms of energy electric field inserts the 35kV collection bus 4 and the 10kV collection bus 12 of main step-up transformer 11 respectively after compiling system and boosting.This scheme of boosting is applicable to the new forms of energy electric field situation that installed capacity is different with compiling distance; Installed capacity is big or compile distance electric field far away and adopt the 35kV electric pressure to compile; Compile circuit and incorporate the 35kV collection bus 4 of the station owner's step-up transformer 11 that boosts into; Installed capacity electric field less or that compile close together adopts the 10kV electric pressure to compile, and compiles the 10kV collection bus 12 that circuit is incorporated booster stations step-up transformer 11 into.The process of boosting of this scheme wind energy turbine set or photovoltaic electric field is said consistent with Fig. 2, mainly be electric field to different installed capacitys in the same area carry out two kinds of electric pressures concentrate compile, situation that bundling is sent outside.
Be three engineering example of the present invention below; Its engineering background: send out in 2010 [29] numbers " General Office of the State Council is about some suggestions of further support Gansu socio-economic development " the 33 according to the file Office of the State Council of the General Office of the State Council---greatly develop west of a river new forms of energy: accelerate to build with wine (spring) good (passs, valley) be the wind-powered electricity generation at center, the solar power generation of attaching most importance to the Dunhuang base of demonstrating; Strive building up the above wind-powered electricity generation of ten million multikilowatt base, the above solar power generation of million kilowatt base to the year two thousand twenty, auxiliary construction is stablized the power supply project that wind-powered electricity generation is seen off.
After " ten million multikilowatt wind-powered electricity generation base, Jiuquan " project verification; Relevant departments such as National Energy Board, National Development and Reform Committee, Chinese DianKeYuan, Gansu Power Company and Gansu Prov. Electric Power Design Inst. fully study and prove; In conjunction with the Northwest Grid characteristics; Proposed the installed capacity principle and the local wind electric field bundling principle of single large-scale new forms of energy electric field: 200MW, the same area 600MW wind-powered electricity generation unit bundling online (not containing the royalty right project) are confirmed as in the single large-scale wind electricity field installed capacity of wind-powered electricity generation base, Jiuquan; Both can guarantee the safety and economic operation of electrical network, make the maximizing the benefits of electricity power enterprise again.
" ten million multikilowatt wind-powered electricity generation base, Jiuquan " the second stage of the project comprises 15 200MW wind energy turbine set and adds up to installed capacity 3,000,000 kW; For at that time worldwide largest, insert the highest ultra-large type wind-powered electricity generation base of electric pressure, Gansu Prov. Electric Power Design Inst. has accomplished related works such as its relevant connecting system design, idle configuration demonstration, booster stations design.
" the 650000 kilowatts of Large-scale Wind Turbines demonstration projects in Jiuquan " engineering comprises 13 50MW wind energy turbine set; Add up to installed capacity 650,000 kW, Gansu Prov. Electric Power Design Inst. has accomplished related works such as its relevant connecting system design, idle configuration demonstration, booster stations design.
" the 1000000 kilowatts of photovoltaic generation demonstrative projects in Dunhuang " engineering comprises and adds up to installed capacity 1,000,000 kW, and Gansu Prov. Electric Power Design Inst. has accomplished related works such as its relevant connecting system design, idle configuration demonstration, booster stations design.
Engineering example 1
Peace north the 4th wind energy turbine set adds up to installation 600MW, divides A, B, three regional wind energy turbine set of C, every district's installed capacity 200MW.
According to method of the present invention, to pacify north the 4th A, B, three regional wind energy turbine set of C are carried out step-up transformer and are designed demonstration:
A) three wind energy turbine set North and South directions are vertically arranged, the about 25km of North and South direction width, the about 7km of east-west direction width.Wind energy turbine set adopts 35kV to compile scheme, and wind energy turbine set master's step-up transformer adopts three winding master step-up transformer forms, electric pressure 330/35/10kV, and wiring group YN/yn0/d11 adopts boosting mode of 35/330kV, directly imports the 330kV master network.
Blower fan showed as power supply characteristic when B) wind energy turbine set was normally moved, so step-up transformer main tapping rated voltage should be higher than 10% of each nominal voltage; Each blower fan of wind energy turbine set needs when putting into operation process system that power supply is provided by static being transformed into, and this moment, blower fan showed as part throttle characteristics, so step-up transformer main tapping rated voltage should equal each nominal voltage; Power supply characteristic and the part throttle characteristics recommendation wind energy turbine set step-up transformer main tapping of taking into account wind energy turbine set are 345 ± 8 * 1.25%/35/10kV.
C) according to the requirement of power system security economical operation; Recommend peace north the 4th wind energy turbine set step-up transformer all to adopt the YN/yn0/d11 mode of connection; Low-pressure side constitutes 3 subharmonic and zero-sequence current circulation channel, has reduced the harmonic pollution of the large-scale current transformer of blower fan to public network.The box step-up transformer of blower fan is recommended to adopt the YN/d11 mode of connection, and same electric pressure internal wiring mode is identical, is convenient to the configuration of various secondary devices.
Above booster stations step-up transformer allocation plan has passed through the evaluation of State Grid Corporation of China's tissue smoothly, is adopted by the owner.
Engineering example 2
In wide nuclear crossbeam wind energy turbine set by in wide nuclear group crossbeam east wind electric field, crossbeam north wind electric field constitute, the back bundling that boosts inserts red building 330kV transformer station with a 330kV transmission line.
Two wind energy turbine set installed capacitys are 50MW, add up to 100MW.Gansu Prov. Electric Power Design Inst. has accomplished its connecting system design report and booster stations application for developing and relevant construction drawing etc.According to engineering example 1 same steps as, proved the method for designing of three step-up transformers in detail.
Above booster stations step-up transformer allocation plan has passed through the evaluations at different levels of Gansu Province's grid company tissue smoothly.
Engineering example 3
Dunhuang gigawatt photovoltaic generation demonstrative project first phase installed capacity is 100MW; 6 of photo-voltaic power generation stations that comprise installed capacity 10MW; 1 of the photo-voltaic power generation station of installed capacity 40MW, first phase 100MW photovoltaic generation project employing bundling are sent scheme outside and are incorporated the change of 110kV Dunhuang into.This project adopts the scheme of boosting shown in Figure 3, and the power station of 40MW adopts 35kV to compile, and the power station of 10MW adopts 10kV to compile, and has significantly practiced thrift construction investment.Gansu Prov. Electric Power Design Inst. has accomplished its connecting system design report and booster stations application for developing and relevant construction drawing design etc.
Claims (7)
1. one kind large-scale new forms of energy electric field master step-up transformer method for designing; Comprise blower fan or photovoltaic generation unit outlet voltage after box step-up transformer rises to 35kV or 35kV and 10 kV, through one three winding master step-up transformer box step-up transformer is exported again and send into main electrical network after voltage rises to the 330kV that is complementary with electrical network or 220kV or 110kV electric pressure by 35kV or 10kV; Specifically comprise the steps:
A. select large-scale new forms of energy electric field master step-up transformer electric pressure and connection type
A.1 the large-scale new forms of energy electric field of the same area adopts three winding master step-up transformers; Its electric pressure is 330/35/10kV; Wind energy turbine set or photovoltaic plant electric energy import three winding master step-up transformers 35kV or according to the electric field installed capacity and compile the distance import 35kV and 10kV side respectively, after three winding master step-up transformers boost to 330kV, incorporate the 330kV electrical network into; Main step-up transformer connection type adopts YN/yn0/d11;
A.2 the large-scale new forms of energy electric field of the same area adopts three winding master step-up transformers; Its electric pressure is 220/35/10kV; Wind energy turbine set or photovoltaic plant electric energy import three winding master step-up transformers 35kV or according to the electric field installed capacity and compile the distance import 35kV and 10kV side respectively, after three winding master step-up transformers boost to 220kV, incorporate the 220kV electrical network into; Main step-up transformer connection type adopts YN/yn0/d11;
A.3 the large-scale new forms of energy electric field of the same area adopts three winding master step-up transformers; Its electric pressure is 110/35/10kV; Wind energy turbine set or photovoltaic plant electric energy import three winding master step-up transformers 35kV or according to the electric field installed capacity and compile the distance import 35kV and 10kV side respectively, after main step-up transformer boosts to 110 kV, incorporate the 110kV electrical network into; Main step-up transformer connection type adopts YN/yn0/d11;
B. design large-scale wind electricity field step-up transformer main tapping rated voltage
B.1 corresponding with steps A .1, large-scale centralized grid type new forms of energy electric field master step-up transformer main tapping rated voltage is chosen as 345 kV ± 8 * 1.25%/35 kV/10.5kV;
B.2 corresponding with steps A .2, large-scale centralized grid type new forms of energy electric field master step-up transformer main tapping rated voltage is chosen as 230 kV ± 8 * 1.25%/35 kV/10.5kV;
B.3 corresponding with steps A .3, large-scale centralized grid type new forms of energy electric field master step-up transformer main tapping rated voltage is chosen as 121 kV ± 8 * 1.25%/35 kV/10.5kV;
C. the box step-up transformer connection type of large-scale new forms of energy electric field
It is that to compile the box step-up transformer connection type of the 10kV of system be D/yn11 for YN/d11 or new forms of energy electric field that the new forms of energy electric field compiles the box step-up transformer connection type of the 35kV of system.
2. one kind large-scale new forms of energy electric field booster system; Comprise main step-up transformer, dynamic reactive compensation device, arc suppression coil or earth resistance; 330kV sees circuit off; The 330kV collection bus, several 35kV compile circuit, and every 35kV compiles circuit and meets many 35kV and compiles cable; Every 35kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 35kV compiles circuit and is connected to the 35kV collection bus; It is characterized in that: main step-up transformer is three winding 330/35/10kV master step-up transformers; The mode of connection is YN/yn0/d11; The 35kV collection bus is connected with the 35kV winding of three winding 330/35/10kV master step-up transformers; Dynamic reactive compensation device is connected through the 10kV winding of 10kV bus with three winding 330/35/10kV master step-up transformers, and arc suppression coil or earth resistance are connected with the 35kV neutral point of three winding 330/35/10kV master step-up transformers; Main step-up transformer high-pressure side is connected to 330 kV collection bus.
3. a kind of large-scale new forms of energy electric field booster system as claimed in claim 2; It is characterized in that: this system comprises that also several 10kV compile circuit; Every 10kV compiles circuit and meets many 10kV and compiles cable; Every 10kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 10kV compiles circuit and connects the 10kV collection bus, and the 10kV collection bus is connected with the 10kV winding of three winding 330/35/10kV master step-up transformers.
4. one kind large-scale new forms of energy electric field booster system; Comprise main step-up transformer, dynamic reactive compensation device, arc suppression coil or earth resistance; 220kV sees circuit off; The 220kV collection bus, several 35kV compile circuit, and every 35kV compiles circuit and meets many 35kV and compiles cable; Every 35kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 35kV compiles circuit and is connected to the 35kV collection bus; It is characterized in that: main step-up transformer is three winding 220/35/10kV master step-up transformers; The mode of connection is YN/yn0/d11; The 35kV collection bus is connected with the 35kV winding of three winding 220/35/10kV master step-up transformers; Dynamic reactive compensation device is connected through the 10kV winding of 10kV bus with three winding 220/35/10kV master step-up transformers, and arc suppression coil or earth resistance are connected with the 35kV neutral point of three winding 220/35/10kV master step-up transformers; Main step-up transformer high-pressure side is connected to the 220kV collection bus.
5. a kind of large-scale new forms of energy electric field booster system as claimed in claim 4; It is characterized in that: this system comprises that also several 10kV compile circuit; Every 10kV compiles circuit and meets many 10kV and compiles cable; Every 10kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 10kV compiles circuit and connects the 10kV collection bus, and the 10kV collection bus is connected with the 10kV winding of three winding 220/35/10kV master step-up transformers.
6. one kind large-scale new forms of energy electric field booster system; Comprise main step-up transformer, dynamic reactive compensation device, arc suppression coil or earth resistance; 110kV sees circuit off; The 110kV collection bus, several 35kV compile circuit, and every 35kV compiles circuit and meets many 35kV and compiles cable; Every 35kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 35kV compiles circuit and is connected to the 35kV collection bus; It is characterized in that: main step-up transformer is three winding 110/35/10kV master step-up transformers; The mode of connection is YN/yn0/d11; The 35kV collection bus is connected with the 35kV winding of three winding 110/35/10kV master step-up transformers; Dynamic reactive compensation device is connected through the 10kV winding of 10kV bus with three winding 110/35/10kV master step-up transformers, and arc suppression coil or earth resistance are connected with the 35kV neutral point of three winding 110/35/10kV master step-up transformers; Main step-up transformer high-pressure side is connected to the 110kV collection bus.
7. a kind of large-scale new forms of energy electric field booster system as claimed in claim 6; It is characterized in that: this system comprises that also several 10kV compile circuit; Every 10kV compiles circuit and meets many 10kV and compiles cable; Every 10kV compiles cable and connects a 0.69/35kV or the box step-up transformer of 0.27/35kV, and the box step-up transformer low-pressure side of each 0.69/35kV or 0.27/35kV is through photovoltaic generation unit that the low-voltage cable blower fan that to connect a voltage be 0.69kV or voltage are 0.27kV; Each bar 10kV compiles circuit and connects the 10kV collection bus, and the 10kV collection bus is connected with the 10kV winding of three winding 110/35/10kV master step-up transformers.
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| CN104868485A (en) * | 2015-06-03 | 2015-08-26 | 中国能源建设集团甘肃省电力设计院有限公司 | New energy power station dynamic reactive power compensation equipment application method and device |
| CN107221952A (en) * | 2017-06-14 | 2017-09-29 | 河北工业大学 | A kind of adjustable controllable wind farm group boosting collects station system |
| CN107272645A (en) * | 2017-06-28 | 2017-10-20 | 中国能源建设集团甘肃省电力设计院有限公司 | The photovoltaic electric station grid connection fault model and analysis method of Neutral Grounding through Resistance in Electrical |
| CN113495200A (en) * | 2020-04-03 | 2021-10-12 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104868485A (en) * | 2015-06-03 | 2015-08-26 | 中国能源建设集团甘肃省电力设计院有限公司 | New energy power station dynamic reactive power compensation equipment application method and device |
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| CN107272645A (en) * | 2017-06-28 | 2017-10-20 | 中国能源建设集团甘肃省电力设计院有限公司 | The photovoltaic electric station grid connection fault model and analysis method of Neutral Grounding through Resistance in Electrical |
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| CN113495200A (en) * | 2020-04-03 | 2021-10-12 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
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