CN107732910B - Method for rapidly recovering power supply - Google Patents
Method for rapidly recovering power supply Download PDFInfo
- Publication number
- CN107732910B CN107732910B CN201711173016.2A CN201711173016A CN107732910B CN 107732910 B CN107732910 B CN 107732910B CN 201711173016 A CN201711173016 A CN 201711173016A CN 107732910 B CN107732910 B CN 107732910B
- Authority
- CN
- China
- Prior art keywords
- power
- local
- node
- transfer
- grid
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012546 transfer Methods 0.000 claims abstract description 38
- 238000013178 mathematical model Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 6
- 238000012216 screening Methods 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
- 238000013075 data extraction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Images
Classifications
-
- H02J3/005—
-
- 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]
Abstract
The invention discloses a method for rapidly recovering power supply, which adopts a simple and reliable simplified power flow model by setting a power recovery method considering conditions, so that the screening of recovery paths is realized by adopting less data and a simplified equation under the condition that a local power grid is relatively simple in structure and operation, and the rapidity of a transfer process is improved. The method comprises the following steps: judging whether the running state of the local power grid meets two conditions before power failure; establishing a transfer path selection set and a simplified power flow model of the power system; obtaining a real-time transfer path selection set and a corresponding simplified power flow and outputting a transfer path meeting the requirements; when a transfer demand exists, the electric power is transferred according to the output transfer path.
Description
Technical Field
The invention relates to the technical field of intelligent power grids, in particular to a method for obviously shortening power supply recovery time under the condition that the operation structure of a fault part power grid is simpler.
Background
Power system failures are inevitable due to harsh environmental factors such as heavy rain, heavy snow, high winds, and congestion of older power equipment, communication channels, and the like. For uncontrollable power system faults, the best countermeasure is to quickly disconnect the fault part from the large power grid when the fault occurs and supply power to the load of the fault part by using other parts, namely, the power supply is recovered by adopting a cut-and-transfer mode.
The existing method for recovering power supply needs to perform real-time stability analysis, such as implementing complex load flow calculation and section analysis, according to the real-time topological result, load condition and the like of the power system. Although the calculation has high accuracy, the real-time performance is weak due to the excessively complicated calculation mode and the data extraction process. While the poor real-time performance reduces the reliability of the power supply and increases the likelihood of further system failure.
Disclosure of Invention
Therefore, in order to solve the above problems, the present invention provides a method for rapidly recovering power supply, which has a simple determination method with accuracy not reduced when conditions are satisfied, so that a recovery path to be taken can be rapidly determined when a fault occurs, and timeliness and reliability of power transfer are improved.
In order to achieve the above object, the present invention provides a method for rapidly recovering power supply, comprising the following steps:
a. judging whether the running state of the local power grid meets the condition before power failure;
b. establishing a mathematical model;
c. solving the mathematical model;
d. when a transfer demand exists, the electric power is transferred according to the output transfer path.
The method for rapidly recovering power supply also meets the following conditions: the step a comprises the following steps:
the conditions include:
1. for all nodes in the local power grid, the following conditions are satisfied:
2. a voltage compensation device is arranged in the local power grid so that the voltage amplitude fluctuation of each node is small, and the voltage amplitude per unit value of each node can be considered to be 1;
when the local power grid simultaneously meets the 2 conditions, executing the step b; and when the local power grid can not meet the 2 conditions, ending the method.
The method for rapidly recovering power supply also meets the following conditions: the step b comprises the following steps:
setting a switching path selection set S:
S={s1,s2,……，spp is the total number of alternative paths, siRepresents an alternative handover path;
establishing a simplified power flow model of the power system:
wherein, PiIs the active power of the node i and,
to estimate the voltage phase angle at node i in the local grid,
for the estimated phase angle of the voltage at node j in the local network, BijIs the imaginary part of the admittance between nodes i, j.
The method for rapidly recovering power supply also meets the following conditions: the step c comprises the following steps:
obtaining a real-time switch-over path selection set S0The power monitoring system determines the switching path selection set according to power output, load power, line connection condition, line capacity parameter and switch state, and when one of the power output, the load power, the line connection condition, the line capacity parameter and the switch state changes, the switching path selection set is recalculated to replace the original switching path selection set, so that the switching path selection set can track the specific condition of the power system in real time;
set S of handover routing for real time0And (3) adopting a power system simulation program to solve the simplified power flow after the power transfer is implemented according to the power transfer path, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in the local power grid after the power transfer is implemented according to the power transfer path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the power transfer path.
The method for rapidly recovering power supply also meets the following conditions: the step d comprises the following steps:
when a transfer demand exists, carrying out power transfer according to the output transfer path; the supply and demand conversion requirement comprises the permanent fault of a certain line of the power system and the power loss of a certain generator; the permanent fault refers to a fault which still cannot be self-healed after two reclosings.
According to the method for rapidly recovering the power supply, the condition that the permanent fault comprises a circuit metal grounding short circuit is also met; reclosing includes single phase reclosing and three phase reclosing.
According to the method, the power recovery method considering conditions is set, a simple and reliable simplified power flow model is adopted, so that the recovery path screening is realized by adopting less data and a simplified equation under the condition that the local power grid is relatively simple in structure and operation, and the rapidity of the transfer process is improved.
Drawings
Fig. 1 is a flow chart of a method for rapidly restoring power.
Detailed Description
Referring to fig. 1, a method for rapidly recovering power includes the following steps:
a. judging whether the running state of the local power grid meets the condition before power failure;
the conditions include:
1. for all nodes in the local power grid, the following conditions are satisfied:
2. a voltage compensation device is arranged in the local power grid so that the voltage amplitude fluctuation of each node is small, and the voltage amplitude per unit value of each node can be considered to be 1;
when the local power grid simultaneously meets the 2 conditions, executing the step b; when the local power grid can not meet the 2 conditions, ending the method;
b. establishing a mathematical model:
setting a switching path selection set S:
S={s1,s2,……，spp is the total number of alternative paths, siRepresents an alternative handover path;
establishing a simplified power flow model of the power system:
wherein, PiIs the active power of the node i and,
to estimate the voltage phase angle at node i in the local grid,
for the estimated phase angle of the voltage at node j in the local network, BijIs the imaginary part of the admittance between nodes i, j;
c. solving a mathematical model:
obtaining a real-time switch-over path selection set S0The power monitoring system determines the switching path selection set according to power output, load power, line connection condition, line capacity parameter and switch state, and when one of the power output, the load power, the line connection condition, the line capacity parameter and the switch state changes, the switching path selection set is recalculated to replace the original switching path selection set, so that the switching path selection set can track the specific condition of the power system in real time;
set S of handover routing for real time0In the method, each transfer path for selection is adopted to solve the simplified power flow after transfer is implemented according to the transfer path by adopting a power system simulation program, namely, the voltage phase angle of a voltage phase angle reference node is set to be 0 according to the active power of all nodes in the local power grid after transfer is implemented according to the transfer path, the estimated voltage phase angles of other n-1 nodes in the local power grid are solved through a simplified power flow model, and the estimated voltage phase angles of the n-1 nodes are judgedWhether the voltage phase angles are all within a preset safety range or not, and if so, outputting the switching path;
d. when a transfer demand exists, carrying out power transfer according to the output transfer path; the supply and demand conversion requirement comprises the permanent fault of a certain line of the power system and the power loss of a certain generator; the permanent fault refers to a fault which still cannot be self-healed after two reclosings.
Permanent faults include metallic ground shorts of the line; reclosing includes single phase reclosing and three phase reclosing.
It should be noted that the above-mentioned embodiments are provided for further detailed description of the present invention, and the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the present invention.
Claims (4)
1. A method of rapidly restoring power, comprising the steps of:
a. judging whether the running state of the local power grid meets the condition before power failure;
b. establishing a mathematical model;
c. solving the mathematical model;
d. when a transfer demand exists, carrying out power transfer according to the output transfer path; the step a comprises the following steps:
the conditions include:
1. for all nodes in the local power grid, the following conditions are satisfied:
cos(θi-θj)≈1,i∈[1,2,…,n],j∈[1,2,…,n]j is not equal to i; n is the total number of nodes in the local power grid, thetaiFor the phase angle of the voltage at node i, theta, in the local networkjThe voltage phase angle of a node j in the local power grid is shown, wherein j is a node adjacent to i;
2. a voltage compensation device is arranged in the local power grid so that the voltage amplitude fluctuation of each node is small, and the voltage amplitude per unit value of each node can be considered to be 1;
when the local power grid simultaneously meets the 2 conditions, executing the step b; when the local power grid can not meet the 2 conditions, ending the method; the step b comprises the following steps:
setting a switching path selection set S:
S＝{s1,s2,……，spp is the total number of alternative paths, siRepresents an alternative handover path;
establishing a simplified power flow model of the power system:
wherein, PiActive power of node i, θ'iIs an estimated voltage phase angle of node i in the local grid, theta'jFor the estimated phase angle of the voltage at node j in the local network, BijIs the imaginary part of the admittance between nodes i, j; the step c comprises the following steps:
obtaining a real-time switch-over path selection set S0The power monitoring system determines the switching path selection set according to power output, load power, line connection condition, line capacity parameter and switch state, and when one of the power output, the load power, the line connection condition, the line capacity parameter and the switch state changes, the switching path selection set is recalculated to replace the original switching path selection set, so that the switching path selection set can track the specific condition of the power system in real time;
set S of handover routing for real time0And (3) adopting a power system simulation program to solve the simplified power flow after the power transfer is implemented according to the power transfer path, namely setting the voltage phase angle of a voltage phase angle reference node to be 0 according to the active power of all nodes in the local power grid after the power transfer is implemented according to the power transfer path, solving the estimated voltage phase angles of other n-1 nodes in the local power grid through a simplified power flow model, judging whether the estimated voltage phase angles of the n-1 nodes are all in a preset safety range, and if so, outputting the power transfer path.
2. The method of claim 1, wherein step d comprises:
when a transfer demand exists, carrying out power transfer according to the output transfer path; the supply and demand conversion requirement comprises the permanent fault of a certain line of the power system and the power loss of a certain generator; the permanent fault refers to a fault which still cannot be self-healed after two reclosings.
3. A method of rapidly restoring power to a power supply as claimed in claim 2, wherein the permanent fault comprises a metallic ground short to the line.
4. A method of rapidly recovering power as claimed in claim 3, wherein the reclosure includes a single phase reclosure and a three phase reclosure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173016.2A CN107732910B (en) | 2017-11-22 | 2017-11-22 | Method for rapidly recovering power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173016.2A CN107732910B (en) | 2017-11-22 | 2017-11-22 | Method for rapidly recovering power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107732910A CN107732910A (en) | 2018-02-23 |
| CN107732910B true CN107732910B (en) | 2020-12-04 |
Family
ID=61217990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711173016.2A Active CN107732910B (en) | 2017-11-22 | 2017-11-22 | Method for rapidly recovering power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107732910B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934316B (en) * | 2020-08-10 | 2024-03-12 | 国网安徽省电力有限公司黄山供电公司 | Method for selecting recovery path of transformer substation after tripping of power grid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103426033A (en) * | 2013-07-31 | 2013-12-04 | 国电南瑞科技股份有限公司 | Power distribution network fault recovery optimization rebuilding algorithm based on critical path method |
| CN106026085A (en) * | 2016-06-27 | 2016-10-12 | 中国南方电网有限责任公司 | Power distribution network closed-loop power supply transferring path optimum decision method |
| CN106374453A (en) * | 2016-09-05 | 2017-02-01 | 中国电力科学研究院 | Electric power system reconstruction method |
| CN107196307A (en) * | 2017-07-18 | 2017-09-22 | 西安交通大学 | A kind of method that electric network active trend is quickly estimated after transformer fault |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810823B (en) * | 2014-01-24 | 2017-07-14 | 国际商业机器公司 | Produce method, equipment and the system of transformer station's load transfer control parameter |
-
2017
- 2017-11-22 CN CN201711173016.2A patent/CN107732910B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103426033A (en) * | 2013-07-31 | 2013-12-04 | 国电南瑞科技股份有限公司 | Power distribution network fault recovery optimization rebuilding algorithm based on critical path method |
| CN106026085A (en) * | 2016-06-27 | 2016-10-12 | 中国南方电网有限责任公司 | Power distribution network closed-loop power supply transferring path optimum decision method |
| CN106374453A (en) * | 2016-09-05 | 2017-02-01 | 中国电力科学研究院 | Electric power system reconstruction method |
| CN107196307A (en) * | 2017-07-18 | 2017-09-22 | 西安交通大学 | A kind of method that electric network active trend is quickly estimated after transformer fault |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107732910A (en) | 2018-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107394773B (en) | Distribution network information physical system reliability assessment method considering fault processing overall process | |
| CN107872058B (en) | Distribution network integrated protection method fusing self-healing of line | |
| CN103762591B (en) | A kind of power distribution network topology layout method | |
| CN109274095A (en) | Low-voltage distribution network users topology estimation method and system based on mutual information | |
| CN103871003A (en) | Power distribution network fault diagnosis method utilizing historical fault data | |
| CN103576048A (en) | Possible faulty line set extracting method for positioning voltage sag source | |
| CN103093276B (en) | Urban power grid risk assessment method | |
| CN108957243A (en) | A kind of method for locating single-phase ground fault and system applied to power distribution network | |
| CN108226713B (en) | Concentric relaxation depression domain analysis method for voltage sag | |
| CN109004631B (en) | Network-based power distribution network self-adaptive backup protection control method | |
| Mariotto et al. | Power systems transient stability indices: an algorithm based on equivalent clusters of coherent generators | |
| CN111697566A (en) | Reliability assessment method for active power distribution network information physical system considering information failure | |
| CN105119251A (en) | Method suitable for determining grounding resistance scheme of flexible direct-current power distribution system | |
| CN104215879B (en) | A kind of short circuit fault of power distribution network localization method and system | |
| CN105356430B (en) | Active closed loop power distribution network protection system and method | |
| CN106849023A (en) | Wide area backup protection association area recognition method based on traveling wave information | |
| CN107732910B (en) | Method for rapidly recovering power supply | |
| CN105391030A (en) | Planned island division method through load gradual loading and aggregation based on network topology structure | |
| CN116540029B (en) | Active power distribution network fault section positioning method and device based on node distortion correction | |
| CN104218668B (en) | The tracking defining method of the prepared auto restart of action is caused during device fails | |
| CN109038554B (en) | Intelligent power distribution terminal local topology generation method | |
| CN108564252B (en) | Power distribution network power supply reliability calculation method considering multifunctional power distribution automation | |
| CN105866630A (en) | Fault diagnosis method and system for handling whole-substation information loss | |
| CN114386222A (en) | Power distribution network cooperative fault recovery method and system based on information physical system | |
| CN112234610B (en) | Reliability analysis method for feeder automation system controlled by centralized FTU |
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 | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201112 Address after: Room w901a, Taiwan Science and technology enterprise development center, Xiamen Torch High tech Zone (Xiang'an) Industrial Zone, Xiamen, Fujian Province Applicant after: XIAMEN GREATER ELECTRIC AUTOMATION Co.,Ltd. Address before: 251800 Yangxin County, Binzhou, Shandong Province, a happy road Applicant before: Yanhaiping |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A method of quickly restoring power supply Effective date of registration: 20220713 Granted publication date: 20201204 Pledgee: Bank of China Limited by Share Ltd. Xiamen branch Pledgor: XIAMEN GREATER ELECTRIC AUTOMATION Co.,Ltd. Registration number: Y2022110000155 |