CN101277014A - Method for selecting wind power generation access system plan - Google Patents

Method for selecting wind power generation access system plan Download PDF

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Publication number
CN101277014A
CN101277014A CNA2008100247225A CN200810024722A CN101277014A CN 101277014 A CN101277014 A CN 101277014A CN A2008100247225 A CNA2008100247225 A CN A2008100247225A CN 200810024722 A CN200810024722 A CN 200810024722A CN 101277014 A CN101277014 A CN 101277014A
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voltage
wind
point
power
delta
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胡煜
陶冶
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JIANGSU KENENG ELECTRIC ENGINEERING CONSULTATION Co Ltd
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JIANGSU KENENG ELECTRIC ENGINEERING CONSULTATION Co Ltd
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Abstract

A method for selecting the plan of the wind power generation access system comprises the following procedures: 1) selecting an area electric network which is suitable to be accessed; 2) selecting the voltage grade which is suitable to be accessed; 3) selecting and confirming an accessing point which is provided with the accessing condition in the confirmed electric network area; 4) presenting a plan for accessing the system; 5) respectively calculating two typical currents for comparing the arrangement rationality and network attrition of each current of plan; 6) executing short-circuit current calculation to each plan; 7) executing an economy and technique comparison to the plan; 8) determining whether the range of the adjustable power factor of the electric motor selected by the wind electric field satisfies the requirement for phase modulation and pressure modulation of the system; and 9) comprehensively comparing and presenting a recommendation plan. A procedure of checking the voltage drop and voltage fluctuation generated by the common connection point of the wind electric field access system is also included between the procedure 6) and the procedure 7). The selecting for the plan of the wind power generation access system according to the method of the invention is accurate and reliable.

Description

Method for selecting wind power generation access system plan
Technical field
The invention belongs to the Electric Design technical field, specifically is a kind of new design wind power generation connecting system method for designing.
Background technology
Wind energy is a kind of cleaning, and is pollution-free, reproducible novel energy.Inexhaustible, nexhaustible; good vast potential for future development is arranged, and the development and use wind power generation reduces environmental pollution, saves fossil energy the protection ecological balance; alleviate power supply contradiction and solve the electrical problem of remote mountain areas, support that economic construction all has important social benefit.Simultaneously wind power generation itself also have advantage that many other generation modes can't compare as: the construction period is short, and the installation scale is flexible, and consume fuel is not free from environmental pollution, does not flood soil etc.Wind power generation is the trend and the trend of world today's electric power development.Progressively increasing along with the production domesticization degree brings objective economic benefit thereby the construction of wind turbine generator and operation cost reduce significantly to wind power generation, and global wind power generation is increasing fast with the speed in every year average 35%.
The wind energy resources of China is only second to the U.S. and the former Soviet Union, occupies the third place in the world.The theoretical reserves of explored wind energy are 32.26 hundred million kW, can utilize to be developed as 2.53 hundred million kW.In the power generation energy resource of China, firepower accounts for 80% at present, and waterpower accounts for 16%, and nuclear energy accounts for 3%, and wind energy only accounts for 0.2%.If still keep this energy resource structure, only power one, to the year two thousand twenty, it is 4,000,000,000 t that China's year needs coal consumption.The explored coal reserves of China is 1,145 hundred million t now, only can keep 30 years.Energy situation is very severe, and obviously, actively developing wind energy energetically is a very important choice alleviating severe situation, and huge development space is also arranged.
Jiangsu is early to utilize one of area of wind energy, and wind energy resources is abundanter.According to various places meteorological observatory (station) long-term observation data, the whole province's annual mean wind speed is 3.5m/s, and (V 〉=3m/s) is 3900 hours to number during year effective wind speed, year effective wind speed frequency 44.6%, year wind energy concentration 122.7W/m2, year available wind energy 495kWh/m2.The research data of China Meterological Science Research Institute shows that the wind energy resources in Jiangsu has 2,380,000 kW approximately, is listed as the 10th in China.The wind energy resources in Jiangsu mainly be distributed in the east coastal, riverine, along the river, along the lake and mountain area, hills.According to preliminary prospecting, the coastal wind resource in east is the most concentrated.From south to north, the coastal wind resource in east, Jiangsu mainly is distributed in areas such as Qidong, Ru Dong, Da Feng, the shining sun, strand, Lianyun Harbour and Ganyu.
Connecting system design before generally only inserts electric pressure according to power plant's Capacity Selection, determines access point after the trend of being correlated with, short circuit, the stability Calculation.But because wind-powered electricity generation has very strong randomness, the influence that changed by wind speed, wind turbine generator can be intermittently, frequent start and stop; When the wind speed variation exceeded the excision wind speed, blower fan can be out of service automatically from the rated output state, if all blower fans of whole wind electric field move simultaneously, will produce variation in voltage and fall the electrical network electrical network, brings influence to operation of power networks; In addition, the variation that the tower shadow effect of change of wind velocity and wind-powered electricity generation machine also can cause the wind-powered electricity generation machine to be exerted oneself, can cause the fluctuation of line voltage equally, therefore except the engineering philosophy and standard of conventional power supply connecting system, cause that area power grid variation in voltage and the degree of falling are restrictions and influence the key factor that the wind energy turbine set access system plan is accepted or rejected, the access point quality of power supply of access system plan should satisfy the requirement of GB, and does not all consider in the design of connecting system before.May affect to electric power netting safe running after actual the operation.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, propose a kind of new wind power generation connecting system method for designing (method of check), for the selection of access system plan provides strong criterion.
Step 1: power balance, select the suitable regional power grid that inserts;
According to the result that power balance is analyzed, select to lack power supply usually and support, need be advanced the regional power grid of electric power as the suitable electrical network that inserts from electrical network.
Step 2: according to the suitable electric pressure that inserts of Capacity Selection;
The following wind energy turbine set of 100MW inserts the 110kV electrical network in principle, and the above wind energy turbine set of 100MW can consider to insert the 220kV electrical network.Because wind-powered electricity generation has very strong randomness, its intermittence, frequent start-stop can bring influence to the operation of the quality of power supply and electrical network, so the 100MW wind energy turbine set also can be considered with 220kV electric pressure connecting system.
Step 3: the access point of selecting to determine to possess in the electrical network zone access conditions;
At first, access point will have available 110kV or 220kV at interval; Secondly, because wind-powered electricity generation has very strong randomness, intermittently frequent start-stop is to the influence of electrical network generation in order to reduce wind-powered electricity generation, and the wind energy turbine set of a constant volume should be selected the relative closely electric substation of system of (the grid short circuit capacity is bigger) with interconnection.In addition, wind energy turbine set should not be too far away apart from the path distance of access point.
Step 4: the difference according to electric pressure, access point proposes access system plan;
Step 5: consider the randomness that wind-powered electricity generation is exerted oneself, respectively to access scheme on the electrical network peak, overfill two kinds of typical trends of power operation of low ebb load period wind energy turbine set calculate.Compare reasonability, via net loss that each scheme trend distributes;
Step 6: each scheme is carried out calculation of short-circuit current;
Computational methods are: set up the electric network composition of each scheme earlier, comprise line length, model, and each electric substation's sharing of load, power plant exerts oneself etc., and the point to the needs checking computations carries out the short circuit current analog computation then.
Step 7: voltage landing and voltage fluctuation that the common junction of wind energy turbine set connecting system produces are checked
According to " quality of power supply voltage fluctuation and flickering " national standard, the variation in voltage limit value that the common junction of wind energy turbine set connecting system produces and change frequency, electric pressure is relevant.
Variation in voltage limit value table in table 1 GB
Figure A20081002472200041
Go into operation a year network load peak, two kinds of modes of low-valley interval are got in analog computation, wind energy turbine set is from the power running status that overfills, the super excision of wind speed wind speed, the instantaneous all random cases of this most serious (but may take place) out of service of blower fan, each scheme access point (PCC point) variation in voltage value is analyzed comparison, thereby judgement is compared each scheme access point variation in voltage, is fallen value;
1., the calculating of voltage landing
The voltage landing of transmission line is meant that the phasor of circuit first and last end two point voltages is poor:
U · 1 - U · 2 = ( R + jX ) I · 2 = ( R + jX ) I · 1 - - - ( 1 )
In the formula, Be respectively circuit first and last end two point voltage phasors, R, X are respectively the resistance and the equivalent reactance of a phase,
Figure A20081002472200052
Be phase current.
With phasor
Figure A20081002472200053
Be reference axis, if
Figure A20081002472200054
With
Figure A20081002472200055
Known, can make phasor diagram as shown in Figure 1.Among the figure
Figure A20081002472200056
It is exactly the voltage drop phasor
Figure A20081002472200057
The voltage drop phasor is decomposed into and voltage phasor
Figure A20081002472200058
Two equidirectional and perpendicular components
Figure A20081002472200059
And
Figure A200810024722000510
The absolute value of remembering these two components is Δ U 2=AD and δ U 2=DB, can be write out by Fig. 1:
Figure A200810024722000511
So the landing of the voltage of transmission line can be expressed as:
U · 1 - U · 2 = ( R + jX ) I · 2 = Δ U · 2 + δ U · 2 - - - ( 3 )
In the formula With
Figure A200810024722000514
Be called the vertical component and the horizontal component of voltage landing.
In power network was analyzed, custom was carried out computing with power.With voltage U 2And electric current I 2A corresponding phase power is:
Figure A200810024722000515
Replace electric current with power, formula (2) can be rewritten as:
Δ U 2 = P 2 R + Q 2 X U 2 δ U 2 = P 2 X - Q 2 R U 2 - - - ( 5 )
Usually, we call voltage loss to the difference of point-to-point transmission absolute value of voltage, when phase angle difference δ is little between two point voltages, can think approx that voltage loss just equals the vertical component of voltage landing.
2, the calculating of voltage fluctuation
The requirement of the collateral security quality of power supply, we also must know the voltage fluctuation of some node in the network.So-called voltage fluctuation, the virtual voltage that is meant certain point in the network is poor with the rated voltage at this place of network, can represent with kilovolt, also can represent with the percentage of rated voltage.If the virtual voltage of certain point is U, the rated voltage at this place is U N, then the voltage fluctuation of representing with percentage is:
d = U - U N U N = ΔU U N × 100 % = RΔP + XΔQ U N 2 × 100 % - - - ( 6 )
Δ P and Δ Q are the active power and the reactive power variable quantity of load in the formula.
In high-voltage fence, general X>>R, then
d ≈ ΔQ S sc × 100 % - - - ( 7 )
S in the formula ScFor investigating the capacity of short circuit of point (being generally PCC).
For changing the variation in voltage that causes by a certain alternate single-phase load
d ≈ 3 ΔS S sc × 100 % - - - ( 8 )
Δ S is the variable quantity of load capacity in the formula.
Three-phase load for balance
d ≈ ΔS S sc × 100 % - - - ( 9 )
In formula (6)~(9), Δ S, Δ P and Δ Q will determine according to load variations character.
Step 8: scheme is done economic technology relatively;
Step 9: carry out phase modulation pressure regulation calculating according to the wind turbine generator data that the owner provides.Computational methods are: change idle the exerting oneself of blower fan outlet, carrying out trend then calculates, variation according to result of calculation observing system access point voltage, draw wind energy turbine set unit output situation to the each point voltage influence, thereby judge wind energy turbine set selects for use the Adjustable Power Factor Current scope of motor whether to satisfy the requirement of system's phase modulation pressure regulation;
Step 10: relatively comprehensive, suggested design is proposed.
Select wind power generation access system plan according to the inventive method, accurately, reliably.
Description of drawings
Fig. 1 is a voltage landing phasor diagram
Fig. 2 is scheme 1 peak load-blower fan power mode cutter that overfills, and access point busbar voltage curve chart 3 is scheme 2 peak loads-blower fan power mode cutters that overfill, access point busbar voltage curve
Two figure are access point busbar voltage curve under the various computing mode of embodiment engineering simulation.By reading of curve real time data (calculated can generate when generating figure and is accurate to 10 -2The data form of S), calculate electric voltage dropping value under this operating mode according to the rules standard.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Connecting system of first wind energy turbine set (100MW) wind turbine generator with A ground is the specific implementation process of example explanation above-mentioned steps:
Step 1: power balance is the result show, A ground electrical network lacks power supply, and A ground only has 3 little machines of certain cogeneration power plant (27MW) to be connected on 110kVA ground transformer station at present, and the power load in A area is mainly advanced from location 220kV major network.After this engineering (first wind energy turbine set wind turbine generator) was all built up in 2007 and put into operation, A ground electrical network still needed to be advanced electric power from the location major network, so the supply district of first wind energy turbine set is an A ground electrical network.
Step 2: first wind energy turbine set installed capacity 100MW, year about 2.1 hundred million kwh quantities of electricity of electric weight can be dissolved by local electrical network, analyze in conjunction with the present situation and the wind energy turbine set installed capacity of A ground electrical network, and this engineering can the 110kV electric pressure insert local electrical network; Because wind-powered electricity generation has very strong randomness, its intermittence, frequent start-stop can bring influence to the operation of the quality of power supply and electrical network, so first wind energy turbine set (100MW) also can be considered with 220kV electric pressure connecting system.
Step 3: the access point of selecting to possess access conditions: 220kV transformer station 1,110kV transformer station 2.
Step 4:I class scheme: the first electric field inserts A ground electrical network with the 110kV electric pressure.
Scheme 1: the newly-built 110kV outlet of first wind energy turbine set inserts the 110kV bus of 220kV transformer station 1.
Scheme 2: the newly-built 110kV outlet of first wind energy turbine set inserts 110kV transformer station 2.
II class scheme: the first wind energy turbine set inserts A ground electrical network with the 220kV electric pressure.
Scheme 3: the newly-built 220kV outlet of first wind energy turbine set inserts the 220kV bus of 220kV transformer station 1.
Step 5:3 scheme peak hours all can satisfy sending of first wind energy turbine set (100MW) power, and system load flow is reasonable, does not have the problem and the contradiction of circuit overload.
A ground~transformer station 1 circuit is carried the meritorious 89MW that is in low ebb when load scheme 2, reaches the surely limit of LGJ-240 lead heat.In addition, because the uncertainty of load, transformer station's 2 low ebbs load may be littler than the analogue value, so need to increase transformer station 2~transformer station, 1 line conductor cross section or be replaced by heat-resisting wire.1-transformer station of transformer station 3 line conductor patterns are LGJ-240, and this circuit disconnects operation under the normal mode, but its important stand-by power supply inlet wire that is transformer station 1.
3 schemes are compared, scheme 3 network loss minimums, and scheme 1 is smaller than scheme 2.
Step 6: each scheme is carried out calculation of short-circuit current, because A ground electrical network is located in the terminal of location electrical network, the system short-circuit levels of current is lower, the access of first wind energy turbine set is smaller to the short circuit current level influence of electrical network, and 3 access schemes all can satisfy the requirement of the standard of access point and near system equipment short circuit current.
Step 7: variation in voltage result of calculation relatively
After setting up correct electric network composition, adopt software to carry out trend and calculate (prior art does not make too many restrictions at this), and on the basis of calculation of tidal current, undertaken, carry out transient stability and calculate the variation in voltage situation of observing by above-mentioned formula,
Table 2 variation in voltage result of calculation comparison sheet
Figure A20081002472200071
Step 8: more as can be known, scheme 3 adopts 220kV electric pressure connecting systems from the economy of scheme, and circuit, outlet are at interval, the change expense of boosting is the most expensive, the annual cost maximum, and economy is the poorest.Although scheme 2 access points are nearer apart from wind energy turbine set than scheme 1, it must be replaced by heat-resisting wire to 2~transformer station of transformer station, 1 circuit LGJ-240 lead, implements comparatively trouble, and this scheme operation network loss is big; Though better slightly on the economy than scheme 1, do not have remarkable advantages.
Step 9: carry out phase modulation pressure regulation calculating according to the wind turbine generator data that the owner provides, by result of calculation as can be known, the Adjustable Power Factor Current scope of the double feedback electric engine that the first wind energy turbine set is selected for use (rated power factor is 1, can set in perception 0.95~capacitive 0.95 scope) satisfies the requirement of service system phase modulation pressure regulation.
Step 10: from technology, economic analysis-by-synthesis, though the economy of scheme 2 will be better than scheme 1 slightly, it is big to the influence of variation in voltage of access point, and the enforcement of this scheme part circuit of need stopping transport is transformed.Therefore, by said method, the scheme 1 of the reasonable better economy of recommended technology.

Claims (1)

1, a kind of method for selecting wind power generation access system plan, step comprises:
1) power balance is selected the suitable regional power grid that inserts; 2) according to the suitable electric pressure that inserts of Capacity Selection;
3) selection determines to possess in the electrical network zone access point of access conditions;
4) difference according to electric pressure, access point proposes access system plan;
5) consider the randomness that wind-powered electricity generation is exerted oneself, respectively to access scheme on the electrical network peak, overfill two kinds of typical trends of power operation of low ebb load period wind energy turbine set calculate; Compare reasonability, via net loss that each scheme trend distributes;
6) each scheme is carried out calculation of short-circuit current;
7) scheme is done economic technology relatively;
8) the wind turbine generator data that provides according to the owner is carried out phase modulation pressure regulation calculating, draws wind energy turbine set unit output situation to the each point voltage influence, thereby judges wind energy turbine set selects for use the Adjustable Power Factor Current scope of motor whether to satisfy the requirement of system's phase modulation pressure regulation;
9) relatively comprehensive, suggested design is proposed;
It is characterized in that, in step 6) and 7) between also comprise step: voltage landing and voltage fluctuation that the common junction of wind energy turbine set connecting system produces are checked, and check method is as follows:
Go into operation a year network load peak, two kinds of modes of low-valley interval are got in analog computation, wind energy turbine set is from the power running status that overfills, the super excision of wind speed wind speed, the instantaneous all the most serious this random cases out of service of blower fan, each scheme access point variation in voltage value is analyzed comparison, thereby judge relatively each scheme access point variation in voltage amplitude, change value;
The variation in voltage amplitude, i.e. voltage landing:
The voltage landing of transmission line is meant that the phasor of circuit first and last end two point voltages is poor:
U · 1 - U · 2 = ( R + jX ) I · 2 = ( R + jX ) I · 1 , In the formula
Figure A20081002472200022
Be respectively circuit first and last end two point voltage phasors, R, X are respectively the resistance and the equivalent reactance of a phase,
Figure A20081002472200023
Be phase current;
Also can be expressed as: U · 1 - U · 2 = ( R + jX ) I · 2 = Δ U · 2 + δ U · 2 , In the formula
Figure A20081002472200025
With Be respectively the vertical component and the horizontal component of voltage landing; When phase angle difference δ is little between two point voltages, can think approx that the poor of point-to-point transmission absolute value of voltage, i.e. voltage loss just equal the vertical component of voltage landing, replace electric current with power, promptly Δ U 2 = P 2 R + Q 2 X U 2 , P and Q are to be respectively the active power and the reactive power of load in the formula;
Investigate the voltage fluctuation of point:
Voltage fluctuation is: d = U - U N U N = ΔU U N × 100 % = RΔP + XΔQ U N 2 × 100 % , Δ P and Δ Q are the active power and the reactive power variable quantity of load in the formula; The virtual voltage of test point is U, and rated voltage is U N
In high-voltage fence, general X>>R, then d ≈ ΔQ S sc × 100 % , S in the formula ScFor investigating the capacity of short circuit of point;
For changing the variation in voltage that causes by a certain alternate single-phase load d ≈ 3 ΔS S sc × 100 % , Δ S is the variable quantity of load capacity in the formula;
Three-phase load for balance d ≈ ΔS S sc × 100 % ;
In the above-mentioned formula, Δ S is that variable quantity, Δ P and the Δ Q of load capacity will determine according to load variations character.
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Cited By (9)

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CN101976845A (en) * 2010-09-01 2011-02-16 国网电力科学研究院 Wind-power reactive power automatic control method for monitor system of wind power station
CN102340148A (en) * 2010-07-22 2012-02-01 中国电力工程顾问集团华东电力设计院 System and method for selecting access manner of wind power plant
CN102790402A (en) * 2012-07-02 2012-11-21 清华大学 Fan selecting method for grid connection point voltage of wind power farm
CN102916425A (en) * 2012-09-14 2013-02-06 安徽省电力公司 Control method for improving system transient stability based on reactive power and voltage regulation
CN103891078A (en) * 2011-07-28 2014-06-25 原子能技术公司 System for producing and distributing electrical energy over an electrical network, and associated optimization method
CN104184169A (en) * 2014-09-11 2014-12-03 国家电网公司 Transient generator tripping control method considering wind power integration and wind-thermal coordination
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CN102340148A (en) * 2010-07-22 2012-02-01 中国电力工程顾问集团华东电力设计院 System and method for selecting access manner of wind power plant
CN101976845A (en) * 2010-09-01 2011-02-16 国网电力科学研究院 Wind-power reactive power automatic control method for monitor system of wind power station
CN103891078A (en) * 2011-07-28 2014-06-25 原子能技术公司 System for producing and distributing electrical energy over an electrical network, and associated optimization method
CN102790402A (en) * 2012-07-02 2012-11-21 清华大学 Fan selecting method for grid connection point voltage of wind power farm
CN102790402B (en) * 2012-07-02 2014-05-28 清华大学 Fan selecting method for grid connection point voltage of wind power farm
CN102916425A (en) * 2012-09-14 2013-02-06 安徽省电力公司 Control method for improving system transient stability based on reactive power and voltage regulation
CN104184169A (en) * 2014-09-11 2014-12-03 国家电网公司 Transient generator tripping control method considering wind power integration and wind-thermal coordination
CN104184169B (en) * 2014-09-11 2017-03-29 国家电网公司 The transient state that a kind of meter and wind-electricity integration wind-fire are coordinated cuts machine control method
CN106451527A (en) * 2016-07-15 2017-02-22 华北电力大学 Doubly-fed wind farm group aggregating method and doubly-fed wind farm group aggregating system based on dynamic characteristics of rotor current
CN106451527B (en) * 2016-07-15 2019-03-01 华北电力大学 Double-fed fan motor field group of planes polymerization and system based on rotor current dynamic characteristic
CN108075477A (en) * 2017-12-01 2018-05-25 国网辽宁省电力有限公司 A kind of electric system pressure regulation method based on electrical heat-storing device
CN108075477B (en) * 2017-12-01 2021-06-25 国网辽宁省电力有限公司 Electric power system voltage regulating method based on electric heat storage device
CN111009894A (en) * 2019-11-27 2020-04-14 国网山东省电力公司经济技术研究院 Comparison and selection method and system for access scheme of power transmission and distribution equipment detection center
CN111009894B (en) * 2019-11-27 2023-03-21 国网山东省电力公司经济技术研究院 Comparison and selection method and system for access scheme of power transmission and distribution equipment detection center

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