CN102290830A - Large-scale wind farm step-up transformer design method and system - Google Patents
Large-scale wind farm step-up transformer design method and system Download PDFInfo
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Abstract
The invention relates to a large-scale wind farm step-up transformer design method and a system. The method comprises that: the voltage of wind power generated by a wind turbine is increased to 35kV through a box-type step-up transformer and the 35kV voltage is directly increased to 330kV through a 35kV/330kV step-up transformer to feed into a main grid. The method specifically comprises the following steps of: A) determining that the installed capacity of the single wind farm of a large-scale wind farm is 200MW approximately and the installed capacities of every three wind farms are bundled and sent out, i.e. the bundled and sent-out installed capacity of every three wind farms are totally 600MW approximately; B) determining that the installed capacity of the wind farm is 200MW and the capacity of the step-up transformer is 240MVA, and transmitting the wind power of each single large-scale wind farm to the 35kV collection bus of the step-up transformer through a twelve-loop to fourteen-loop 35kV box-type transformer collection bus; and C) adopting a 35/330kV one-step voltage increasing method for the large-scale wind farms within the same area and directly feeding the power in the 330kV main grid. Since wind power paralleling is realized through one-step voltage transformation, the voltage transformation loss is decreased and the power generation benefit is increased.
Description
Technical field
The present invention relates to wind power generation and technology of transmission of electricity field, belong 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 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 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.
Summary of the invention:
The technical problem to be solved in the present invention one is to provide a kind of large-scale wind electricity field step-up transformer method for designing, and it two 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 present invention solves above-mentioned first technical problem, by the following technical solutions: a kind of large-scale wind electricity field step-up transformer method for designing, comprise that the wind-powered electricity generation that blower fan sends rises to the 35kV electric pressure through the box change of boosting, and is characterized in that by 35kV/330kV step-up transformer voltage directly being risen to 330kV by 35kV sends into main electrical network; Specifically comprise the steps:
A. determine installed capacity of large-scale wind electricity field and bundling principle
The single wind energy turbine set installed capacity of determining the large-scale wind electricity field is about 200MW, and per three wind energy turbine set bundlings are sent, and promptly per three wind energy turbine set installation bundling is sent capacity and amounted to about 600MW;
Because the characteristics that each blower fan of wind energy turbine set disperses access, blower fan platform number is many more, the probability of blower fan off-grid is big more, being defined as single wind energy turbine set installed capacity for the installed capacity of large-scale wind electricity field is about 200MW, three wind energy turbine set bundlings are sent installed capacity and are amounted to about 600MW, have reduced the impact of single wind energy turbine set off-grid to Northwest Grid; Reduce the probability of bundling wind-powered electricity generation group off-grid simultaneously, to the impact of electrical network, also reduced the probability that chain off-grid takes place in each large-scale wind electricity field when further having reduced bundling wind-powered electricity generation group off-grid.
B. select large-scale wind electricity field step-up transformer capacity
Determine that installed capacity is the wind energy turbine set of 200MW, the capacity of its step-up transformer is 240MVA;
Installed capacity according to each large-scale wind electricity field is 200MW, considers the conversion efficiency of step-up transformer, and the reactive requirement of coupling system, and the capacity that is defined as single 200MW wind energy turbine set step-up transformer is 240MVA.
The wind-powered electricity generation of single large-scale wind electricity field is compiled the 35kV collection bus that circuit is transported to step-up transformer through 12 to 14 times 35kV casees changes;
C. select large-scale wind electricity field step-up transformer electric pressure
Boosting mode of 35/330kV is adopted in the same area large-scale wind electricity field, directly imports the 330kV master network;
Because the distributed power sources that adopt are concentrated the online scheme more, it is shorter relatively that the interior 35kV of same wind energy turbine set compiles total line length, therefore determines to adopt boosting mode of 35/330kV for the same area large-scale wind electricity field, directly imports the 330kV master network; This scheme has been cancelled the primary voltage transform part, thereby can reduce the power transformation investment, increases power benefit.
D. design large-scale wind electricity field step-up transformer main tapping rated voltage
Large-scale wind electricity field step-up transformer main tapping rated voltage is 345 ± 8 * 1.25%/35kV;
Consider that existing power supply characteristic has part throttle characteristics again in the running of wind energy turbine set, therefore recommending large-scale wind electricity field step-up transformer main tapping rated voltage is 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.
E. the form of wind energy turbine set box type transformer
Single wind energy turbine set step-up transformer adopts the YN/d11 mode of connection; Each box step-up transformer wiring group adopts the D/yn11 mode of connection.
Consider the demand of power system security economical operation, single large-scale wind electricity field step-up transformer adopts the YN/d11 mode of connection, and 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.
According to the mode of connection of large-scale wind electricity field step-up transformer, each box step-up transformer wiring group adopts D/yn11 mode of connection, has realized that the perfection of Y/D, D/Y system transforms.
The present invention solves above-mentioned second technical problem, by the following technical solutions: 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, 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 sent circuit through the 330kV collection bus with 330kV and is connected.
Described 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 sent circuit 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 by the 330kV step-up transformer.The present invention adopts boosting mode of 330/35kV, reduced by an electric pressure, just reduced the one time power transformation investment, thereby the booster stations of a series of 35/110kV have been reduced, 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 by 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 a step-up transformer system construction drawing of the present invention under each large-scale wind electricity field installed capacity same case,
Fig. 3 is a step-up transformer system construction drawing of the present invention under each large-scale wind electricity field installed capacity different situations.
Among the figure: 1-large-scale wind electricity field 330kV sends circuit, 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 is 0.69kV, compiles cable 12 by 35kV and receive the 35kV case to become and compile on the circuit 11 after low-voltage cable 13 causes the box step-up transformer 10 of 35kV to boost to 35kV.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 by 110kV afterwards and cause 330kV booster stations 110kV collection bus 4, after boosting to the 330kV electric pressure by 330kV step-up transformer 3, send circuit through 330kV and import 330kV master's electrical network.
Fig. 2 is the boost scheme of the present invention 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 sent circuit 1 through 330kV collection bus 2 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 transformers of three 35kV/330kV step-up transformers high-pressure side 15 is connected to 330kV collection bus 2,330kV collection bus 2 is sent circuit 1 with 330kV and is connected.The capacity of three 35kV/330kV step-up transformers 15 is 240MVA transformer 1502.
Large-scale wind energy turbine set step-up transformer system regional wind-powered electricity generation first stage of the project application of the present invention in 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, import 330kV master electrical network to the 330kV electric pressure after 330kV sends circuit by 35kV/330kV step-up transformer first class boost of the present invention afterwards.
The scheme of boosting of the present invention has been cancelled boost power transformation link in the scheme of 35/110/330kV tradition, 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 present invention 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 present invention 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 sent circuit 1 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 described consistent with Fig. 2, only is the capacity at 330kV step-up transformer in the different corresponding adjustment 330kV booster stations of the capacity of wind energy turbine set.
Be three engineering example of the present invention below, its engineering background
:In recent years, along with the issuing and implementation of " regenerative resource method ", wind-powered electricity generation exploitation in Gansu Province's has obtained very fast development.Gansu Provincial Party committee, provincial government are according to national wind-powered electricity generation development plan, suit measures to local conditions, the strategic objective of " building wind-powered electricity generation corridor, the west of a river; reproduce western land Three Gorges " has been proposed, and area, Jiuquan abundant at wind energy resources, that have many-sided advantage again builds " ten million multikilowatt wind-powered electricity generation base ", and this also becomes, and country is defeated continue transfering natural gas from the west to the east, oil east, west, the another landmark project of development of the West Regions after transferring electricity from the west to the east and the Qinghai-Tibet Railway.
After " ten million multikilowatt wind-powered electricity generation base, Jiuquan " project verification, National Energy Board, National Development and Reform Committee, China's DianKeYuan, water power surveying and designing institute, northwest, northwest electricity designing institute, the Gansu Power Company, relevant departments such as 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 wind electricity field: the single large-scale wind electricity field installed capacity of wind-powered electricity generation base, Jiuquan is defined as 200MW, the same area 600MW wind-powered electricity generation unit bundling online (not containing the royalty right project), 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 " first stage of the project comprises 19 200MW wind energy turbine set and 300+200MW royalty right wind energy turbine set adds up to installed capacity 430MW, 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 finished related works such as its relevant connecting system design, idle configuration demonstration, booster stations design.Booster stations such as Beijing University's bridge west booster stations all put into operation.
Engineering example 1
The prosperous horse wind energy turbine set in Yumen is made of prosperous horse first wind energy turbine set of Datang group company, China National Offshore Oil Corporation's second wind energy turbine set, prosperous horse the 3rd wind energy turbine set of China Energy Conservation Investment Corp., and three wind energy turbine set add up to installation 600MW.
According to method of the present invention, Yumen three wind energy turbine set of prosperous horse are carried out step-up transformer design demonstration:
A) the prosperous horse first wind energy turbine set capacity 200MW of Datang group company, the second wind energy turbine set capacity 200MW of China National Offshore Oil Corporation, and prosperous horse the 3rd wind energy turbine set capacity 200MW of China Energy Conservation Investment Corp., three families build prosperous horse west 330kV booster stations jointly, and bundling is sent into Yumen town 330kV transformer station with a 330kV circuit.
B) three wind energy turbine set installed capacitys are 200MW, take into account optimum transformation efficiency of transformer and power system reactive power demand, reserve certain reactive capability space, and therefore design recommends three wind energy turbine set step-up transformer capacity to be 240MVA.
C) 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.Take all factors into consideration 10kV, 35kV, 110kV compiles formula investing and electrical loss factor, recommend to adopt 35kV to compile scheme, the wind energy turbine set step-up transformer adopts two volume deformation types, and cancellation 110kV electric pressure winding can significantly reduce investment cost in the maximum power transformation efficient of assurance system; Therefore each wind energy turbine set step-up transformer of design recommendation is boosting mode of 35kV/330kV, and each wind energy turbine set is directly sent into Yumen town 330kV and become after boosting.
Blower fan showed as power supply characteristic when D) 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%/35kV.
E) according to the requirement of power system security economical operation, recommend three wind energy turbine set step-up transformers of prosperous horse all to adopt the YN/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.Therefore the low pressure box type transformer is recommended to adopt the D/yn11 mode of connection, and same electric pressure internal wiring mode is identical, is convenient to the configuration of various secondary devices.
F) according to traditional power transformation mode, the low pressure of each each blower fan of wind energy turbine set of prosperous horse is compiled scheme and be should be 0.69/10/110kV, 0.69/35/110kV or 0.69/35kV, take all factors into consideration low pressure and compile Route Length simultaneously in conjunction with power transformation investments at different levels, each wind energy turbine set of prosperous horse 0.69/35/330kV two-stage boosting mode is recommended in design, can reduce by a power transformation link the guaranteed while at least in the transformer conversion efficiency, significantly reduced once investment, the integrated efficient of whole system slightly improves simultaneously.
G) in the wind-powered electricity generation project, great majority are that scale is in 200MW and above large-scale wind electricity field, if insert the mode of electrical network behind the employing two-stage voltage transformation again, each wind energy turbine set need be built at least two 110kV booster stations, twice 110kV circuits and 330kV booster stations, wind power generation could be delivered to electrical network, each booster stations adds that the gross investment of transmission line is very big.If the special-purpose step-up transformer of the novel wind power that adopts Gansu Prov. Electric Power Design Inst. to propose directly boosts to 330kV by 35kV, three wind energy turbine set only need be built 330kV booster stations, just can be with the more reliable electrical network of delivering to of wind power generation, and invest and significantly reduce.Realize the wind-powered electricity generation online by the one-level voltage transformation, for so that large-scale wind electricity field connecting system a kind of reliable economic again mode is provided.
Above booster stations step-up transformer allocation plan has passed through the evaluations at different levels of State Grid Corporation of China's tissue smoothly, and three tame owners all adopt, and various bidding works are finished, and put into operation at the beginning of 2011.
Engineering example 2
Beijing University's bridge west wind electric field by Beijing University of Chinese water power group bridge first wind energy turbine set, converging can Beijing University's bridge the 4th wind energy turbine set, China Power Beijing University bridge tendencies electric field constitutes, the back bundling that boosts inserts Dunhuang 750kV with a 330kV transmission line and becomes.
Three wind energy turbine set installed capacitys are 200MW, add up to 600MW.Gansu Prov. Electric Power Design Inst. has finished its connecting system design report and booster stations application for developing and relevant construction drawing etc.According to 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 State Grid Corporation of China's tissue smoothly, and all put into operation for the end of the year 2010.
Engineering example 3
Bridge gulf, wind energy turbine set China Resources, bridge gulf first wind energy turbine set, bridge gulf, Huaneng Group second wind energy turbine set, north associating and association's prosperous bridge gulf the 3rd wind energy turbine set formation, it is 600MW that three wind energy turbine set add up to installed capacity, and the back bundling that boosts inserts in single time 330kV circuit of 330kV change ~ Dunhuang, Yumen town 750kV change.
Gansu Prov. Electric Power Design Inst. has finished its connecting system design report and booster stations application for developing and relevant construction drawing design etc.Wherein, north associating is built jointly by two tame owners with assisting prosperous bridge gulf the 3rd wind energy turbine set, respectively undertakes the construction of 100MW; Divide for the ease of assets, select north associating and association's each newly-built 120MVA main transformer of prosperous bridge gulf according to same steps as; All the other 2 200MW wind energy turbine set are all selected the 240MVA main transformer.
All put into operation at the beginning of three wind energy turbine set 2011 in bridge gulf.
Claims (4)
1. a large-scale wind electricity field step-up transformer method for designing comprises that the wind-powered electricity generation that blower fan sends rises to the 35kV electric pressure through the box change of boosting, and is characterized in that by 35kV/330kV step-up transformer voltage directly being risen to 330kV by 35kV sends into main electrical network; Specifically comprise the steps:
A. determine installed capacity of large-scale wind electricity field and bundling principle
The single wind energy turbine set installed capacity of determining the large-scale wind electricity field is about 200MW, and per three wind energy turbine set bundlings are sent, and promptly per three wind energy turbine set installation bundling is sent capacity and amounted to about 600MW;
B. select large-scale wind electricity field step-up transformer capacity
Determine that installed capacity is the wind energy turbine set of 200MW, the capacity of the power transformation device that boosts is 240MVA;
The wind-powered electricity generation of single large-scale wind electricity field is compiled the 35kV collection bus that circuit is transported to step-up transformer through 11 to 12 times 35kV casees changes;
C. select large-scale wind electricity field step-up transformer electric pressure
Boosting mode of 35/330kV is adopted in the same area large-scale wind electricity field, directly imports the 330kV master network;
D. design large-scale wind electricity field step-up transformer main tapping rated voltage
Large-scale wind electricity field step-up transformer main tapping rated voltage is 345 ± 8 * 1.25%/35kV;
E. the form of wind energy turbine set box type transformer
Single wind energy turbine set step-up transformer adopts the YN/d11 mode of connection; Each box step-up transformer wiring group adopts the D/yn11 mode of connection.
2. 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 sent circuit through the 330kV collection bus with 330kV and is connected.
3. a kind of large-scale wind electricity as claimed in claim 2 field step-up transformer system, it is characterized in that: described 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 sent circuit with 330kV and is connected.
4. as claim 2 or 3 described a kind of large-scale wind electricity field step-up transformer systems, it is characterized in that: the main tapping rated voltage of 35kV/330kV step-up transformer is designed to 345 ± 8 * 1.25%/35kV.
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Application publication date: 20111221 |