CN109586307A - A kind of load shedding control method of offshore wind farm access system - Google Patents
A kind of load shedding control method of offshore wind farm access system Download PDFInfo
- Publication number
- CN109586307A CN109586307A CN201811508477.5A CN201811508477A CN109586307A CN 109586307 A CN109586307 A CN 109586307A CN 201811508477 A CN201811508477 A CN 201811508477A CN 109586307 A CN109586307 A CN 109586307A
- Authority
- CN
- China
- Prior art keywords
- node
- control
- voltage
- voltage stability
- sensitivity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000035945 sensitivity Effects 0.000 claims abstract description 22
- 230000010354 integration Effects 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 2
- 240000002853 Nelumbo nucifera Species 0.000 claims 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 2
- 238000004364 calculation method Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
-
- H02J3/386—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of load shedding control methods of offshore wind farm access system.The fluctuation of meter and offshore wind farm access system, according to network structure and real-time system information, it sets out to obtain load shedding control method to improve the voltage stability of system, calculates the unstable index of each node voltage in known wind power integration system including step S1, by multiport Thevenin's equivalence；Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and calculates voltage stability key node control target；Step S3, for the given node that can carry out cutting load control, its control sensitivity to voltage stability key place is calculated, n with higher sensitivity control nodes is chosen and is controlled；Step S4, using the corresponding control amount of control each control node of Calculation of Sensitivity, implement control to improve voltage stability.The present invention can be to prevent wind power integration system voltage unstability from carrying out cutting load control as target.
Description
Technical field
The invention belongs to technical field of power systems, and in particular to a kind of cutting load controlling party of offshore wind farm access system
Method.
Background technique
In the electric system of current wind power integration, the method for mainly taking time-domain-simulation obtains cutting load control strategy, so
And the validity of off-line simulation control effect depends on the accuracy and Trouble Match degree of model.And for wind power integration system
System, since wind electricity volatility is changing its operation conditions and its parameter constantly, offline decision-premaking can not be adapted to.Cutting load conduct
Anti- Voltage Instability last-resort, it is necessary to have the ability that energy accurate and effective promotes voltage stability.Therefore, it is necessary to design one kind
The load shedding control method of offshore wind farm access system, Lai Gaishan wind power integration system voltage stability, prevents Voltage Instability, this
The electric system that wind-powered electricity generation permeability is continuously improved is of great significance.
The present invention principle equivalent using multiport Dai Weinan, surveys the network information and voltage magnitude according to system, calculates
The sensitivity index R of reflecting voltage stability key node and control node close relation degreeji, select to control by sensitivity
Place simultaneously calculates control amount, obtains the load shedding control method of anti-Voltage Instability.
Summary of the invention
The purpose of the present invention is to provide a kind of load shedding control methods of offshore wind farm access system, and this method is according to net
Network structure and real-time system information, to prevent wind power integration system voltage unstability from carrying out cutting load control as target.
To achieve the above object, the technical scheme is that a kind of cutting load controlling party of offshore wind farm access system
Method, the fluctuation of meter and offshore wind farm access system are steady with the voltage for improving system according to network structure and real-time system information
It is qualitative to set out to obtain load shedding control method, include the following steps:
Step S1, the unstable finger of each node voltage in known wind power integration system is calculated by multiport Thevenin's equivalence
Mark Ivsi；
Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and
It calculates voltage stability key node and controls target；
Step S3, for the given node that can carry out cutting load control, its control to voltage stability key place is calculated
Sensitivity processed is chosen with higher sensitivity control node and is controlled；
Step S4, the corresponding control amount of control node is calculated, implements control to improve voltage stability.
In an embodiment of the present invention, the step S1, specifically: known wind power integration system utilizes multiport Dai Weinan
Equivalence, multinode power grid is equivalent at two impedance of node i, two node power grid, it is regarded as when wherein wind-electricity integration point has regulating power
Power supply node loses regulating power and is then considered as load bus, calculates spread of voltage index Ivsi with this.
In an embodiment of the present invention, the step S3, specifically: for the given node j that can carry out cutting load control,
It calculates and reflects its control sensitivity index between voltage stability key node i:
Wherein, ZeqiFor node i system side equivalent impedance；ZLL(ij)For the mutual impedance of node j and node i；For node i fortune
Voltage phasor when row,Voltage phasor when being run for node j；
To control sensitivity as foundation, select the biggish node of sensitivity as control place.
In an embodiment of the present invention, the step S4, specifically: the corresponding control amount of control node j is calculated, then controls section
The cutting load percentage B of point j are as follows:
Wherein:
B=2Pt,jiPr,ji+2Qt,jiQr,ji
In formula: St,jiIt is node j to the transfer load of node i；Pt,ji、Qt,jiFor the active and reactive power of transfer load；
Sr,jiTo remove S in duty valuet,jiPart；Pr,ji、Qr,jiFor Sr,jiActive and reactive power；SLeqiExpression node i etc.
Duty value；IVSI,i,tar、IVSI,i,preIndicate the spread of voltage index of voltage stability key node i control front and back.
Compared to the prior art, the invention has the following advantages: present invention only requires the impedances for knowing partial electric grid
Information and node voltage amplitude can obtain the load shedding control method of offshore wind farm access system；Compared to existing method, i.e.,
It is simple and quick, in real time effectively, and can sufficiently count and wind electricity volatility, to improve wind power integration system voltage stability.
Detailed description of the invention
Fig. 1 is sample calculation IEEE14 node diagram.
Fig. 2 is two impedance of node i, two node power grid.
Fig. 3 is the load shedding control method flow chart of offshore wind farm access system.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of load shedding control method of offshore wind farm access system, meter and offshore wind farm access system
Fluctuation set out to obtain cutting load to improve the voltage stability of system according to network structure and real-time system information
Control method includes the following steps:
Step S1, the unstable finger of each node voltage in known wind power integration system is calculated by multiport Thevenin's equivalence
Mark Ivsi；
Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and
It calculates voltage stability key node and controls target；
Step S3, for the given node that can carry out cutting load control, its control to voltage stability key place is calculated
Sensitivity processed is chosen with higher sensitivity control node and is controlled；
Step S4, using the corresponding control amount of control each control node of Calculation of Sensitivity, implement control to improve voltage stabilization
Property.
The step S1, specifically: known wind power integration system utilizes multiport Thevenin's equivalence, by multinode power grid etc.
Two impedance of node i, two node power grid is imitated into, power supply node is regarded as when wherein wind-electricity integration point has regulating power, loses adjusting energy
Power is then considered as load bus, calculates spread of voltage index Ivsi with this.
The step S3, specifically: for the given node j that can carry out cutting load control, calculating reflection, it is steady with voltage
Control sensitivity index between qualitative key node i:
Wherein, ZeqiFor node i system side equivalent impedance；ZLL(ij)For the mutual impedance of node j and node i；For node i fortune
Voltage phasor when row,Voltage phasor when being run for node j；
To control sensitivity as foundation, select the biggish node of sensitivity as control place.
The step S4, specifically: the corresponding control amount of control node j is calculated, then the cutting load percentage B of control node j
Are as follows:
Wherein:
B=2Pt,jiPr,ji+2Qt,jiQr,ji
In formula: St,jiIt is node j to the transfer load of node i；Pt,ji、Qt,jiFor the active and reactive power of transfer load；
Sr,jiTo remove S in duty valuet,jiPart；Pr,ji、Qr,jiFor Sr,jiActive and reactive power；SLeqiExpression node i etc.
Duty value；IVSI,i,tar、IVSI,i,preIndicate the spread of voltage index of voltage stability key node i control front and back.
The following are specific implementation processes of the invention.
The method of the present invention calculated examples select IEEE14 node system (as shown in Figure 1).Node 8 is wind power integration node,
Under a certain operating status, calculating spread of voltage index and can obtaining node 14 is system voltage stability key node, works as progress
When cutting load controls, it is considered as cutting load place to the control effect of voltage stability key node, it is steady to reach system voltage
Qualitative requirement.
Step 1: complex electric network is equivalent at two impedance of node i, two node power grid, and result is such as by Thevenin's equivalence
Shown in Fig. 2, it is as shown in table 1 to calculate the unstable index of each node voltage:
The 1 unstable index of each node voltage of table
Step 2: using 0.5 as spread of voltage index limits and target value, then the spread of voltage index of node 14
IVSIIt is out-of-limit, it need to control it.
Step 3: calculating the control of reflecting voltage stability key node and each cutting load control place place substantial connection
Sensitivity Rji, the results are shown in Table 2.
S index of each cutting load control node of table 2 to node 14
Step 4: calculating each control node to the target of spread of voltage index using node 14 as cutting load node
Control amount:
Control amount is calculated with this and implements control, 29.07% load is cut off on node 14, to guarantee that system voltage is stablized
Property.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (4)
1. a kind of load shedding control method of offshore wind farm access system, which is characterized in that meter and offshore wind farm access system
Fluctuation sets out to obtain cutting load control according to network structure and real-time system information to improve the voltage stability of system
Method processed, includes the following steps:
Step S1, the unstable index of each node voltage in known wind power integration system is calculated by multiport Thevenin's equivalence
Ivsi；
Step S2, whether predicate node spread of voltage index is out-of-limit, and out-of-limit node is voltage stability key node, and is calculated
Voltage stability key node controls target；
Step S3, for the given node that can carry out cutting load control, its control spirit to voltage stability key place is calculated
Sensitivity is chosen with higher sensitivity control node and is controlled；
Step S4, the corresponding control amount of control node is calculated, implements control to improve voltage stability.
2. a kind of load shedding control method of offshore wind farm access system according to claim 1, which is characterized in that described
Step S1, specifically: known wind power integration system utilizes multiport Thevenin's equivalence, and multinode power grid is equivalent at node i two
Two node power grid of impedance, is regarded as power supply node when wherein wind-electricity integration point has regulating power, lose regulating power be then considered as it is negative
Lotus node calculates spread of voltage index Ivsi with this.
3. a kind of load shedding control method of offshore wind farm access system according to claim 1, which is characterized in that described
Step S3, specifically: for the given node j that can carry out cutting load control, calculates and reflect itself and voltage stability key node i
Between control sensitivity index:
Wherein, ZeqiFor node i system side equivalent impedance；ZLL(ij)For the mutual impedance of node j and node i；When being run for node i
Voltage phasor,Voltage phasor when being run for node j；
To control sensitivity as foundation, select the biggish node of sensitivity as control place.
4. a kind of load shedding control method of offshore wind farm access system according to claim 3, which is characterized in that described
Step S4, specifically: the corresponding control amount of control node j is calculated, then the cutting load percentage B of control node j are as follows:
Wherein:
B=2Pt,jiPr,ji+2Qt,jiQr,ji
In formula: St,jiIt is node j to the transfer load of node i；Pt,ji、Qt,jiFor the active and reactive power of transfer load；Sr,jiFor
S is removed in duty valuet,jiPart；Pr,ji、Qr,jiFor Sr,jiActive and reactive power；SLeqiIndicate that the equivalence of node i is negative
Lotus；IVSI,i,tar、IVSI,i,preIndicate the spread of voltage index of voltage stability key node i control front and back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508477.5A CN109586307A (en) | 2018-12-11 | 2018-12-11 | A kind of load shedding control method of offshore wind farm access system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508477.5A CN109586307A (en) | 2018-12-11 | 2018-12-11 | A kind of load shedding control method of offshore wind farm access system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109586307A true CN109586307A (en) | 2019-04-05 |
Family
ID=65929556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811508477.5A Pending CN109586307A (en) | 2018-12-11 | 2018-12-11 | A kind of load shedding control method of offshore wind farm access system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109586307A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912164A (en) * | 2019-12-13 | 2020-03-24 | 国网福建省电力有限公司 | Green energy island energy storage capacity configuration method considering voltage stability |
| CN111460753A (en) * | 2020-05-09 | 2020-07-28 | 国网湖南省电力有限公司 | Method for calculating influence of new energy machine group access on Thevenin equivalent parameters of power grid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199381A (en) * | 2018-01-18 | 2018-06-22 | 国网福建省电力有限公司 | A kind of cutting load place selection method for wind power integration system voltage stability |
| CN108923433A (en) * | 2018-07-10 | 2018-11-30 | 福州大学 | A kind of effective cutting load place on-line selection method improving voltage stability |
-
2018
- 2018-12-11 CN CN201811508477.5A patent/CN109586307A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199381A (en) * | 2018-01-18 | 2018-06-22 | 国网福建省电力有限公司 | A kind of cutting load place selection method for wind power integration system voltage stability |
| CN108923433A (en) * | 2018-07-10 | 2018-11-30 | 福州大学 | A kind of effective cutting load place on-line selection method improving voltage stability |
Non-Patent Citations (6)
| Title |
|---|
| XIAOMING MOU等: "An Analytical Sensitivity Index for Load Shedding to A void Voltage Instability", 《2013 IEEE POWER & ENERGY SOCIETY GENERAL MEETING》 * |
| XIAOMING MOU等: "An Analytical Sensitivity Index for Load Shedding to A void Voltage Instability", 《2013 IEEE POWER & ENERGY SOCIETY GENERAL MEETING》, 25 November 2013 (2013-11-25), pages 1 - 5 * |
| 李鹏等: "一种防止电压失稳的切负荷控制方法", 《电网技术》 * |
| 李鹏等: "一种防止电压失稳的切负荷控制方法", 《电网技术》, vol. 35, no. 3, 31 March 2011 (2011-03-31), pages 32 - 37 * |
| 高飞翎等: "基于响应的电压稳定性评估和控制方法", 《电网与清洁能源》 * |
| 高飞翎等: "基于响应的电压稳定性评估和控制方法", 《电网与清洁能源》, vol. 34, no. 11, 25 November 2018 (2018-11-25), pages 8 - 14 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912164A (en) * | 2019-12-13 | 2020-03-24 | 国网福建省电力有限公司 | Green energy island energy storage capacity configuration method considering voltage stability |
| CN111460753A (en) * | 2020-05-09 | 2020-07-28 | 国网湖南省电力有限公司 | Method for calculating influence of new energy machine group access on Thevenin equivalent parameters of power grid |
| CN111460753B (en) * | 2020-05-09 | 2022-04-08 | 国网湖南省电力有限公司 | Method for calculating influence of new energy machine group access on Thevenin equivalent parameters of power grid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105322535B (en) | Power system two benches optimal load flow computational methods containing THE UPFC | |
| Chen et al. | Theoretical line loss calculation of distribution network based on the integrated electricity and line loss management system | |
| CN109586307A (en) | A kind of load shedding control method of offshore wind farm access system | |
| CN103986193B (en) | A kind of method that maximum wind grid connection capacity obtains | |
| CN104993525A (en) | Active power distribution network coordination optimization control method considering ZIP loads | |
| CN110543695B (en) | Electric-gas coupling comprehensive energy system feasible region calculation method | |
| CN106570774A (en) | Progressive learning grid regulation and control method based on learning theory | |
| CN113991856B (en) | Micro-energy network multi-adaptability mu PMU optimal point distribution method | |
| CN109858061B (en) | Power distribution network equivalence and simplification method for voltage power sensitivity estimation | |
| Chankaya et al. | Grid-interfaced photovoltaic–battery energy storage system with slime mold optimized adaptive seamless control | |
| CN110212541A (en) | A kind of direct current power spring control method based on prediction model | |
| CN105958535A (en) | Distributed power supply cluster control system and control method thereof | |
| Jereminov et al. | Impact of load models on power flow optimization | |
| CN105262148A (en) | Planned annual electric power balancing method taking wind power output characteristic into consideration | |
| TW201327404A (en) | Control method of photovoltaic inverter adaptive to solar cell array simulator | |
| CN115693687B (en) | Autonomous regulation and control method for distribution network of transformer area in consideration of comprehensive regulation cost | |
| Qin et al. | A modified data-driven regression model for power flow analysis | |
| Zhao et al. | Reactive power optimization considering dynamic reactive power reserves | |
| CN109599897A (en) | A kind of power-less compensation control method considering offshore wind farm fluctuation | |
| Gupta et al. | Coordinated load flow solution for coupled transmission-distribution system incorporating load modeling | |
| CN105470999B (en) | A kind of microgrid power distribution method based on distributed finite-time control device | |
| Khosravi et al. | Distribution of optimum reactive power in the presence of wind power plant and considering voltage stability margin using genetic algorithm and Monte Carlo methods | |
| CN107086603A (en) | A kind of Random-fuzzy Continuation power flow of power system containing DFIG | |
| Wang et al. | A voltage stability control based on impedance estimation for the independent microgrid | |
| CN108649596B (en) | Battery energy storage system dynamic model suitable for load modeling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190405 |
|
| RJ01 | Rejection of invention patent application after publication |