CN103730892B - It is a kind of to count and the fair electricity net safety stable control method of wind power plant benefit - Google Patents
It is a kind of to count and the fair electricity net safety stable control method of wind power plant benefit Download PDFInfo
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- CN103730892B CN103730892B CN201310647008.2A CN201310647008A CN103730892B CN 103730892 B CN103730892 B CN 103730892B CN 201310647008 A CN201310647008 A CN 201310647008A CN 103730892 B CN103730892 B CN 103730892B
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- 230000005611 electricity Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000035945 sensitivity Effects 0.000 claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 230000006641 stabilisation Effects 0.000 claims abstract description 20
- 238000011105 stabilization Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000005684 electric field Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 238000012163 sequencing technique Methods 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
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Abstract
Counted and the fair electricity net safety stable control method of wind power plant benefit the invention discloses a kind of, belong to technical field of power system operation control.The present invention organically combines safety on line stabilization early warning system, safety stabilization control system, operation of power networks operating mode is analyzed in line computation and refresh key transmission cross-section and its transmission of electricity limit and controllable wind power plant set and its sensitivity to key transmission cross-section, then determined to cut machine control range in real time according to sensitivity sequence, machine controlled quentity controlled variable is cut according to the contribution degree mean allocation to safety and stability problem in the control range of selection.The present invention can meet demand of the wind power plant to equitable benefit in emergent control while wind power base safe and stable operation requirement is met, and improve the level that becomes more meticulous of wind-powered electricity generation emergent control.
Description
Technical field
The invention belongs to technical field of power system operation control, more precisely the present invention relates to one kind meter and wind power plant
The formulation of the fair electricity net safety stable control strategy of interests and implementation.
Background technology
" scale development, concentration are grid-connected " has turned into one of Main Patterns that China's Wind Power Generation is utilized.Adapting to large-scale wind
The electricity net safety stable control technology aspect in electric base, domestic framework to wind power base safety stabilization control system, optimization are matched somebody with somebody
Principle is put to be explored, but large-scale wind electricity base control model how to determine, control framework adaptability how, coordination strategy
How to adapt to regenerative resource it is uncertain the problems such as also without it is ripe, can be directly used for the achievement in research of engineering practice.When
The security and stability control strategy applied in preceding wind power plant is mostly based on the principle of " offline budget, real-time matching ", to presetting
Wind power plant implement control or cut off, this does not obviously meet fair principle.
Each wind power plant owner participates in power network and concludes the business as the main body of equality, and the management and running not required nothing more than under normality are observed
" three is public " principle, also in the urgent need to embodying the fairness doctrine in safety and stability emergent control, i.e., when implementing promptly to cut machine control,
Consider contribution degree of the wind power plant to safety and stability problem and the enabling capabilities to power network, machine object and fair point are cut in selection
With cutting machine amount.Based on the tradition peace control strategy that " offline budget, real-time matching " principle is formulated, wind power plant set in advance is implemented
Control cuts off, it is clear that do not met fair principle, it is impossible to meet demand of each wind power plant owner to interests fairness.Wind
The selection of electric field owner's cutting machine object and the distribution of controlled quentity controlled variable all propose requirements at the higher level from fairness angle.
The content of the invention
The purpose of the present invention is：In order to meet the requirement of the fairness in wind-powered electricity generation security and stability control, a kind of meter and wind are proposed
The fair electricity net safety stable control method of electric field interests.The method analyzes operation of power networks operating mode and refreshes crucial defeated in line computation
Electric section and its transmission of electricity limit and controllable wind power plant set and its sensitivity to key transmission cross-section, then according to sensitivity
Sequence determines to cut machine control range in real time, according to the contribution degree mean allocation to safety and stability problem in the control range of selection
Machine controlled quentity controlled variable is cut, while wind power base safe and stable operation requirement is met, wind power plant is met to a certain extent to urgent
The demand of equitable benefit in control, improves the level that becomes more meticulous of wind-powered electricity generation emergent control.
Specifically, the present invention is realized using following technical scheme, is comprised the following steps：
1）Powernet security stabilization early warning system is periodically run every Δ T time, is analyzed by in-circuit emulation and brushed
The forecast failure collection being concerned about under new current time sectionN represents the sum of forecast failure, and calculates
Meter and transient stability send out key sections transmission of electricity limiting value P with the wind-powered electricity generation of thermally-stabilised constraint after each fault clearancemax:{Pmax1,
Pmax2,…,Pmaxn, and choose this area and may participate in N number of wind power plant of control and form initial inspectable space Ω0, calculate Ω0Middle institute
There is output of wind electric field that the sensitivity S of power is conveyed relative to key transmission cross-section:{S1,S2,…,SN, wherein Si=δPKey sections/δ
PWind power plant i, δ PWind power plant iRepresent the power variation of wind power plant i, δ PKey sectionsRepresent wind power plant i changed power δ PWind power plant iAfter cause key
The corresponding power variation of transmission cross-section, and will be including forecast failure collection ψ, key sections transmission of electricity limiting value Pmax, initial controllable sky
Between Ω0, sensitivity sequencing table be input into safety stabilization control system in interior time section information；
2）After safety stabilization control system periodically obtains time section information from on-line early warning system, real-time monitoring electricity
Force system element fault or fault-free trip state；Forecast failure element of set under monitoring to actually occur failure and current section
ElementWhen matching, judge that key sections currently convey power P0With transmission of electricity limit PmaxiDifference Δ P=P0-PmaxiWhether it is more than
Zero：If Δ P>0, using Δ P as the minimum controlled quentity controlled variable for meeting safety and stability requirement, and it is transferred to step 3）；Otherwise continue real-time
Monitoring, and fault message is fed back into safety on line stabilization early warning system；
3）After failure triggering, whether actual the exerting oneself of all wind power plants meets following formula clearly in control space first：
Wherein, Pi0Represent that i-th wind power plant is actual to exert oneself；
If can not meet, coordinate excision conventional power unit or take other emergent control measures, be transferred to step 5）；
If disclosure satisfy that, control object is screened by setting sensitivity threshold value Sth, select Ω0Medium sensitivity
Control object composition control scope Ω more than Sth, ensures that effective controlled quentity controlled variable of the control object chosen meets in screening process
The minimum control quantity constraint that following formula determines：
Sensitivity threshold initial value Sth0If setting the too high minimum control quantity constraint for leading to not meet above formula determination,
According to step-length step iteration reduction sensitivity threshold Sth=Sth- step, expands and implements control range, until meeting above formula determination
Untill minimum control quantity constraint；Last output control scope Ω；
4）Implement the controlled quentity controlled variable mean allocation based on effective output in control range Ω, the effective output refers to i-th
The actual P that exerts oneself of individual wind power planti0The power on key transmission cross-section is diverted to based on sensitivity, numerically equal to its sensitivity and its
The product actually exerted oneself, i-th dispensing controlled quantities Δ P of wind power plantiSolve according to the following formula：
Wherein, SjRepresent that j-th wind power plant conveys the sensitivity of power, P relative to key transmission cross-sectionj0Represent j-th
Wind power plant is actual to exert oneself；
5）By step 3）Or step 4）What is determined cuts machine control object and its controlled quentity controlled variable formation control command by coordination control
Main website issues control sub-station execution, and because minimum control object is Wind turbines or wind power plant feeder line, therefore control sub-station need to
Control command forwarding is performed into station to perform；After control measure are implemented, in the upward feedback scheduling of control information that execution station will confirm that
One of center station, the data source analyzed as next periodic on-line.
Above-mentioned technical proposal is further characterized by, the step 3）Middle step >=Sth0/5。
Beneficial effects of the present invention are as follows：The present invention has safety on line stabilization early warning system, safety stabilization control system
Machine is combined, and is analyzed operation of power networks operating mode in line computation and is refreshed key transmission cross-section and its transmission of electricity limit, and controllable wind power plant
Set and its sensitivity to key transmission cross-section；Then determined to cut machine control range in real time according to sensitivity sequence, in selection
Control range in cut machine controlled quentity controlled variable according to the contribution degree mean allocation to safety and stability problem, meeting, wind power base safety is steady
While determining service requirement, demand of the wind power plant to equitable benefit in emergent control is met to a certain extent, improve wind-powered electricity generation
The level that becomes more meticulous of emergent control.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is safety stabilization control system architectural schematic in the inventive method.
Fig. 3 is the implementation schematic diagram of the inventive method.
Fig. 4 is embodiment of the present invention topology schematic diagram.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and with reference to example.
As shown in figure 1, the present invention is comprised the following steps：
1）Key transmission cross-section and its transmission of electricity limit, inspectable space and its sensitivity sequencing on-line refresh
Powernet security stabilization early warning system is periodically run every Δ T time, is analyzed by in-circuit emulation and refreshed
The forecast failure collection being concerned about under current time sectionN represents the sum of forecast failure, and calculates every
Meter and transient stability send out key sections transmission of electricity limiting value P with the wind-powered electricity generation of thermally-stabilised constraint after one fault clearancemax:{Pmax1,
Pmax2,…,Pmaxn}。
N number of wind power plant that selection this area may participate in control forms initial inspectable space Ω0.Calculate Ω0In all wind power plants
Exert oneself and the sensitivity S of power is conveyed relative to key transmission cross-section:{S1,S2,…,SN, wherein Si=δPKey sections/δPWind power plant i, δ
PWind power plant iRepresent the power variation of wind power plant i, δ PKey sectionsRepresent wind power plant i changed power δ PWind power plant iAfter cause key transmission cross-section
Corresponding power variation, both are MW at unit.By forecast failure collection ψ, key sections transmission of electricity limiting value Pmax, it is initial controllable
Space Ω0, the time section information such as sensitivity sequencing table input safety stabilization control system.
2）Malfunction monitoring is matched and controlled quentity controlled variable calculates triggering in real time
Safety stabilization control system is periodically from on-line early warning system read access time section information, and real-time monitoring electric power
System element failure or fault-free trip state.Forecast failure collection element under monitoring to actually occur failure and current sectionWhen matching, judge that key sections currently convey power P0With transmission of electricity limit PmaxiDifference Δ P=P0-PmaxiWhether zero is more than：
If Δ P>0, then using Δ P as the minimum controlled quentity controlled variable for meeting safety and stability requirement, and it is transferred to step 3）；Otherwise, continue real-time
Monitoring, and fault message is fed back into safety on line stabilization early warning system.
3）Selection control range
After failure triggering, whether actual the exerting oneself of all wind power plants meets formula clearly in control space first（1）：
Wherein, Pi0Represent that i-th wind power plant is actual to exert oneself.
If can not meet, need to coordinate excision conventional power unit or take other emergent control measures, be transferred to step 5）；
If it is satisfied, then being screened to control object by setting sensitivity threshold value Sth, Ω is selected0Control of the medium sensitivity more than Sth
Object composition control scope Ω, ensures that effective controlled quentity controlled variable of the control object chosen meets the minimum of following formula determination in screening process
Control quantity constraint：
Sensitivity threshold initial value Sth0If setting the too high minimum control quantity constraint for leading to not meet above formula determination,
According to step-length step iteration reduction sensitivity threshold Sth=Sth- step, expands and implements control range, until meeting above formula determination
Untill minimum control quantity constraint；Last output control scope Ω.
Sensitivity threshold value and its iteration step length should be formulated according to specific electrical network feature, and to improve calculating speed suggestion
Control is implemented to iterations control.Iteration control is for example required within 4 times, then can be not less than spirit by setting iteration step length
The 1/5 of sensitivity threshold initial value：step≥Sth0/ 5 realize.Usually, it is proposed that initial value is 0.75, step-length is 0.25, after so setting
Maximum iteration is 3 times, to meet requirement of the emergent control to rapidity.
4）Mean allocation controlled quentity controlled variable
Implement the foundation of controlled quentity controlled variable mean allocation in control range Ω based on sensitivity " effective output ".So-called base
It is i-th P that actually exerts oneself of wind power plant in " effective output " of sensitivityi0It is diverted to the power on key transmission cross-section, numerical value
It is upper to be equal to sensitivity SiWith the P that actually exerts oneselfi0Product Si×Pi0。
I-th dispensing controlled quantities Δ P of wind power plantiAccording to formula（2）Solve.
Wherein, Δ PiRepresent i-th controlled quentity controlled variable of wind power plant distribution（MW）, Δ P represent meet safety and stability requirement most
Small controlled quentity controlled variable（MW）, Pi0Represent that i-th wind power plant is currently exerted oneself（MW）, wherein, SjRepresent that j-th wind power plant is defeated relative to key
Electric section conveys the sensitivity of power, Pj0Represent that j-th wind power plant is actual to exert oneself, Ω represents the control range set of selection.
5）Control strategy is performed and control information feedback
By step 3）, step 4）What step determined cuts machine control object and its controlled quentity controlled variable formation control command by coordinating control master
Station issues control sub-station execution.Because minimum control object is Wind turbines or wind power plant feeder line, therefore, control sub-station need by
Control command forwarding performs station and performs.After control measure are implemented, the upward feedback scheduling center of control information that station will confirm that is performed
Stand, one of data source analyzed as next periodic on-line.
Implement the inventive method, it is necessary to rely on the hierarchical control system of the safety stabilization control system shown in Fig. 2.Fig. 1
In algorithm flow implementation in fig. 2 as shown in figure 3, control centre station realize information taken, coordination optimization decision-making and
The functions such as data renewal, corresponding to the step 1 in Fig. 1）；Coordinate control main website and be typically placed in load-center substation, real-time monitoring
Operation of power networks state in region, and implement quick calculating and the renewal of control strategy, coordinated control function is realized, corresponding to Fig. 1
In step 2）, step 3）With step 4）；Control sub-station is typically individually positioned in booster stations with execution station and station is collected in station, real
The collection of existing information and upload, and security and stability control measurement perform function on the spot, corresponding to the step 5 in Fig. 1）.
In Fig. 4, node 1 has 8 wind power plant WF1~WF8 grid-connected, the arrangement for coordinate control main website, control sub-station, performing station
As shown in Figure 4.Below with power network in Fig. 4 in t0When discontinuity surface issue between tight knot point 1- nodes 3 that a loop line tripping is another to return
As a example by load problem, the process of the inventive method stability contorting with high safety is described in detail.
Step 1：In t0When discontinuity surface under, on line refreshable this area compare care forecast failure collection ψ be 1,2,3 groups of node
Into triangle looped network occur N-1 failures, key sections are the passway for transmitting electricity 1-3 of node 1- nodes 3.It is corresponding with the present embodiment, close
There is the transmission of electricity limit P after a loop line cut-offs in key sectionmax=680MW.Controlled wind electric field space Ω0It is 8 wind under node 1
Electric field WF1~WF8, sensitivity S of all wind power plants relative to key transmission cross-section 1-3 is 0.56.1 is gone back to after 5min automatically）
Into next online computation of Period.
Step 2：In t0When discontinuity surface under, coordinate control main website and monitor node 1- nodes occur 3 one times in area power grid
Line trips, the forecast failure collection ψ of discontinuity surface when this failure belongs to this, and the actual transmitted power P of key transmission cross-section after failure0
Be 701MW, then emergent control amount Δ P=P0-Pmax=21MW>0, there are problems that safety and stability, it is necessary to implement emergent control, it is transferred to
Step 3）.
Step 3：Wind-powered electricity generation whole controlled quentity controlled variables can reduce the power of key transmission cross-section and be：
ΣSi×Pi0=0.56×987MW=552.72MW>21MW, meets controlled quentity controlled variable demand, continues to implement control range choosing
Select the flow with controlled quentity controlled variable mean allocation.
Sensitivity threshold value S is setth=0.75, now control range Ω is empty set, continues iteration；
Sth=SthDuring-step=0.5, because all wind-powered electricity generation field sensitivities in control space Ω are all higher than 0.5, so this
When control range Ω=Ω0。
Step 4：Average mark dosage is calculated according to distribution formula, as shown in table 1.
The controlled quentity controlled variable mean allocation result of table 1 and actual control result
Wind power plant collects often more than one wind power plant benefit main body under station in table 1（Such as collect station 8 has 3 owners below
WF8-1、WF8-2、WF8-3）, now each Interest Main Body is as the object participation control allocation of equality.Finally, it is right to control
As and its dispensing controlled quantities formed control command issue control sub-station perform control strategy.
Step 5：After control sub-station at node 1 receives control command, forward each wind power plant to collect station and perform.Due to most
Small control object is Wind turbines or wind field feeder line, therefore actual controlled quentity controlled variable Δ PiIt is discrete magnitude.So actual controlled quentity controlled variable is past
It is past to be greater than formula（2）The certain combination of income value, this voluntarily distributes implementation by wind power plant centralized control system.Listed in table 1 and be based on
Minimum is crossed to cut principle and determines and actually cut board number and cut machine amount.
Sum it up, compared with traditional control method that is offline and taking no account of wind power plant benefit justice, the inventive method
Loss blower fan number of units is few and is evenly distributed in different wind power plants, beneficial for providing voltage and power support, and realizes minimum
Cross and cut.It can be seen that, the inventive method both embodies justice, and Precise control is realized again.
Although the present invention is disclosed as above with preferred embodiment, embodiment is not of the invention for limiting.Not
Depart from the spirit and scope of the present invention, any equivalence changes done or retouching also belong to the protection domain of the present invention.Cause
The content that this protection scope of the present invention should be defined with claims hereof is as standard.
Claims (2)
1. it is a kind of to count and the fair electricity net safety stable control method of wind power plant benefit, it is characterised in that to comprise the following steps：
1) powernet security stabilization early warning system is periodically run every Δ T time, analyzes to refresh by in-circuit emulation and work as
The forecast failure collection of discontinuity surface ShiShimonoseki heart when precedingN represents the sum of forecast failure, and calculates each
Meter and transient stability send out key sections transmission of electricity limiting value P with the wind-powered electricity generation of thermally-stabilised constraint after fault clearancemax:{Pmax1,
Pmax2,…,Pmaxn, and choose area and may participate in N number of wind power plant of control and form initial inspectable space Ω0, calculate Ω0In own
Output of wind electric field conveys the sensitivity S of power relative to key transmission cross-section:{S1,S2,…,SN, wherein Si=δ PKey sections/δ
PWind power plant i, δ PWind power plant iRepresent power variation, the δ P of wind power plant iKey sectionsRepresent wind power plant i changed power δ PWind power plant iAfter cause key
The corresponding power variation of transmission cross-section, and will be including forecast failure collection ψ, key sections transmission of electricity limiting value Pmax, initial controllable sky
Between Ω0, sensitivity sequencing table be input into safety stabilization control system in interior time section information；
2) after safety stabilization control system periodically obtains time section information from safety on line stabilization early warning system, supervise in real time
Survey power system component failure or fault-free trip state；Forecast failure under monitoring to actually occur failure and current section
Collection elementWhen matching, judge that key sections currently convey power P0With transmission of electricity limit PmaxiDifference Δ P=P0-PmaxiWhether
More than zero：If Δ P>0, using Δ P as meet safety and stability requirement minimum controlled quentity controlled variable, and be transferred to step 3)；Otherwise continue
Real-time monitoring, and fault message is fed back into safety on line stabilization early warning system；
3) after failure triggering, whether actual the exerting oneself of all wind power plants meets following formula clearly in control space first：
Wherein, Pi0Represent that i-th wind power plant is actual to exert oneself；
If can not meet, coordinate excision conventional power unit or take other emergent control measures, be transferred to step 5)；
If disclosure satisfy that, control object is screened by setting sensitivity threshold value Sth, select Ω0Medium sensitivity is more than
The control object composition control scope Ω of Sth, ensures that effective controlled quentity controlled variable of the control object chosen meets following formula in screening process
The minimum control quantity constraint for determining：
Sensitivity threshold initial value Sth0If setting the too high minimum control quantity constraint for leading to not meet above formula determination, according to
Step-length step iteration reduction sensitivity threshold Sth=Sth- step, expands and implements control range, determines most until meeting above formula
Untill small control quantity constraint；Last output control scope Ω；
4) the controlled quentity controlled variable mean allocation based on effective output is implemented in control range Ω, the effective output refers to i-th wind
The actual P that exerts oneself of electric fieldi0The power on key transmission cross-section is diverted to based on sensitivity, numerically equal to its sensitivity and its reality
The product exerted oneself, i-th dispensing controlled quantities Δ P of wind power plantiSolve according to the following formula：
Wherein, SjRepresent that j-th wind power plant conveys the sensitivity of power, P relative to key transmission cross-sectionj0Represent j-th wind-powered electricity generation
Actually exert oneself field；
5) by step 3) or step 4) cut machine control object and its controlled quentity controlled variable that determine form control command by coordinating control main website
Control sub-station execution is issued, because minimum control object is Wind turbines or wind power plant feeder line, therefore control sub-station will need to be controlled
System order forwarding performs station and performs；After control measure are implemented, the upward feedback scheduling central station of control information that station will confirm that is performed,
One of data source analyzed as next periodic on-line.
It is 2. according to claim 1 to count and the fair electricity net safety stable control method of wind power plant benefit, it is characterised in that
The step 3) in step >=Sth0/5。
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Owner name: STATE GRID GANSU ELECTRIC POWER COMPANY GANSU ELEC Free format text: FORMER OWNER: STATE GRID GANSU ELECTRIC POWER COMPANY GANSU ELECTRIC POWER CORPORATION, WIND POWER TECHNOLOGY CENTER Effective date: 20140919 |
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Effective date of registration: 20140919 Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Applicant after: NANJING NARI Group Corp. Applicant after: STATE GRID GANSU ELECTRIC POWER Co. Applicant after: GANSU ELECTRIC POWER CORPORATION WIND POWER TECHNOLOGY CENTER Applicant after: NARI TECHNOLOGY Co.,Ltd. Applicant after: State Grid Corporation of China Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Applicant before: NANJING NARI Group Corp. Applicant before: STATE GRID GANSU ELECTRIC POWER Co. Applicant before: GANSU ELECTRIC POWER CORPORATION WIND POWER TECHNOLOGY CENTER |
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