CN104764961A - Island detection method for distributed energy resources of automatic safety control system - Google Patents
Island detection method for distributed energy resources of automatic safety control system Download PDFInfo
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- CN104764961A CN104764961A CN201510179630.4A CN201510179630A CN104764961A CN 104764961 A CN104764961 A CN 104764961A CN 201510179630 A CN201510179630 A CN 201510179630A CN 104764961 A CN104764961 A CN 104764961A
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- 238000001514 detection method Methods 0.000 title claims abstract description 8
- 230000001360 synchronised effect Effects 0.000 claims abstract description 8
- 230000000977 initiatory effect Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to an island detection method for distributed energy resources of an automatic safety control system. The method includes the steps that a control terminal arranged on a distributed power supply side conducts synchronous frequency measurement on a distributed power supply and prints a time mark on the distributed power supply, and synchronous frequency measurement data are sent to a public power grid side through a 3G network; a control terminal arranged on the public power grid side conducts synchronous frequency measurement on a public power grid, prints a time mark on the public power grid and receives the synchronous frequency measurement data sent by the distributed power supply side; the control terminal arranged on the public power grid side calculates the difference between frequency of the public power grid side and frequency of the distributed power supply side according to the time marks, and if the frequency difference exceeds a set operating value, it is judged that an islanding phenomenon occurs; if the frequency difference exceeds a set starting value but does not exceed the set operating value, a frequency difference energy integral value Kdf is calculated; if Kdf exceeds a frequency difference energy integral set value, it is judged that the islanding phenomenon occurs.
Description
The application is application number: 201210516878.1, and invention and created name is " islanding detect of the distributed energy of automated security control system, control method ", and the applying date is: the divisional application of the application for a patent for invention on Dec 05th, 2012.
Technical field
The present invention relates to technical field of electric power, particularly a kind of islanding detect, control method of distributed energy of the automated security control system based on 3G network.
Background technology
So-called island phenomenon, refer in distributed generation system, when mains supply because failure accident or have a power failure maintenance and after tripping, the distributed grid-connected electricity generation system of each user side fails detect power down mode in time thus self is cut off electricity network, the final isolated island electricity generation system forming the self-energizing be made up of distributed power station grid-connected system and its connected load.The generation of island effect can bring serious potential safety hazard to system equipment and related personnel, comprise: (1) island effect make voltage and frequency out of hand, will be there is larger fluctuation in the voltage in islanded system and frequency, thus cause damage to electrical network and subscriber equipment; (2) when islanded system is accessed electrical network again, because the distributed power generation unit in system during reclosing may be asynchronous and make release unit be damaged with electrical network, and very high dash current may be produced, thus the distributed power generation unit in infringement islanded system, even cause electrical network again to trip; (3) island effect may can not be removed by causing trouble, thus causes the infringement of grid equipment, and disturbs the automatic or manual of electrical network normal power supply system to recover; (4) the island effect circuit that makes some be considered to disconnect with all power supplys is charged, and this can bring the danger of electric shock to related personnel.Therefore, in distributed generation system, if can quick obtaining isolated island information carry out emergency control in utility network side, personnel and equipment breakdown can be avoided to occur.
The island protect of distributed generation system has two kinds, based on by the local electrical quantities that collects of monitoring grid-connecting apparatus with based on the anti-islanding protection communicated.Island protect based on communication is divided into intertripping island protect and carrier wave island protect etc.Traditional intertripping island protect wiring is complicated, needs to connect a large amount of control cables.Island protect based on local measurement comprises passive type and active alone island protection, and passive type island protect also exists check frequency, and active alone island protection needs to add disturbing signal to system, and can only install at distributed electrical source.
Summary of the invention
The technical problem to be solved in the present invention proposes a kind of island detection method being suitable for the distributed energy of the automated security control system of anti-island protect function.
For solving the problems of the technologies described above, the island detection method of the distributed energy of the automated security control system provided of the present invention, comprises the steps:
The control terminal being installed in distributed electrical source carries out synchro measure frequency to this distributed power source, and stamps markers, and synchro measure frequency data are sent to utility network side by 3G network;
The control terminal being installed in utility network side carries out synchro measure frequency to utility network, and stamps markers, receives the synchro measure frequency data that distributed electrical source send simultaneously;
Be installed in the control terminal of utility network side according to markers, calculate the frequency difference of utility network side and distributed electrical source, if this frequency difference is more than a set action value, (this set action value is generally ± 0.5Hz, concrete numeric reference State Grid Corporation of China company standard Q/GDW617-2011: photovoltaic plant access electric power network technique regulation), then judge island phenomenon occurs; If described frequency difference exceeds a setting initiation value (be generally 0.1Hz, this setting initiation value requires to be greater than terminal acquisition precision), but does not exceed described set action value, then following formula (1) is adopted to calculate frequency difference energy product score value K
df:
…（1）
In formula, Df: the frequency difference of public network side and distributed electrical source;
If K
dfmore than a frequency difference energy integral setting value, then judge island phenomenon occurs.
The terminal of transformer substation side and the terminal of distributed electrical source unify beat by global clock synchro system, carry out strange land high-speed synchronous sampling, gather electric parameters calculated rate, form the frequency data of band absolute time mark, the dynamic frequency data of band absolute time mark are sent to transformer substation side terminal by 3G wireless network by distributed electrical source.
Relative to prior art, the technique effect that the solution of the present invention has: (1) the present invention is by gathering the frequency of utility network side and the frequency of distributed electrical source, method is simple and reliable, the mode of connection is simple, be convenient to engineering construction, realize the detection of isolated island within the scope of from grid-connected isolating switch to utility network side bus.When frequency difference exceed setting initiation value, do not exceed set action value time, adopt frequency difference method of energy integral to differentiate, effectively decrease check frequency, effectively ensured the islanding detect rate of distributed energy, expand islanding detect scope, improve safe operation of electric network.(2) alone island detection system for distributed energy of the present invention comprises: distributed electrical source, the synchro measure based on 3G network of transformer substation side and control terminal.The terminal of transformer substation side and the terminal of distributed electrical source unify beat by global clock synchro system, carry out strange land high-speed synchronous sampling, gather electric parameters calculated rate, form the frequency data of band absolute time mark, the dynamic frequency data of band absolute time mark are sent to transformer substation side terminal by 3G wireless network by distributed electrical source.Transformer station's terminal is according to distributed electrical source and transformer substation side frequency data, frequency difference energy integral principle is adopted to differentiate distributed power source running status, by 3G network, the corresponding command is sent to distributed electrical source side termination, solve the grid-connected derivative islanding problem of distributed power source.
Accompanying drawing explanation
Fig. 1 is the islanding detect schematic flow sheet of the embodiment of the present invention;
In figure: Df: for public network lateral terminal calculates public network side and distributed electrical source difference on the frequency; Fsys: for public network lateral terminal calculates public network frequency; Fdg: distributed electrical source frequency; The given time delay of Fset1: set action value, Tset1; Kdf: frequency difference energy product score value, Kset2 frequency difference energy set-point;
Fig. 2 is distributed power source connecting system automated security control system of the present invention and terminal device arrangenent diagram thereof.
Embodiment
The islanding detect of the distributed energy of the automated security control system of the present embodiment, control method, comprise the steps:
The control terminal being installed in distributed electrical source carries out synchro measure frequency to this distributed power source, and stamps markers, and synchro measure frequency data are sent to utility network side by 3G network;
The control terminal being installed in utility network side carries out synchro measure frequency to utility network, and stamps markers, receives the synchro measure frequency data that distributed electrical source send simultaneously;
Be installed in the control terminal of utility network side according to markers, calculate the frequency difference of utility network side and distributed electrical source, if this frequency difference is more than a set action value, (this set action value is generally ± 0.5Hz, concrete numerical value also can with reference to State Grid Corporation of China company standard Q/GDW617-2011: photovoltaic plant access electric power network technique regulation), send trip signal through given time delay (being generally less than 160 milliseconds) backward distributed electrical source; If described frequency difference exceeds a setting initiation value (be generally 0.1Hz, this setting initiation value requires to be greater than terminal acquisition precision), but does not exceed described set action value, then following formula (1) is adopted to calculate frequency difference energy product score value K
df:
…（1）
In formula, Df: the frequency difference of public network side and distributed electrical source;
If K
dfmore than a frequency difference energy integral setting value, then send trip signal to distributed electrical source.
Be installed in the control terminal of distributed electrical source, after the trip signal receiving utility network side, the grid-connected isolating switch of tripping, eliminates island operation state.
When frequency difference exceed setting initiation value, do not exceed set action value time, adopt frequency difference method of energy integral to differentiate, effectively decrease check frequency, effectively ensured the islanding detect rate of distributed energy, expand islanding detect scope, improve safe operation of electric network.
The terminal of transformer substation side and the terminal of distributed electrical source unify beat by global clock synchro system, carry out strange land high-speed synchronous sampling, gather electric parameters calculated rate, form the frequency data of band absolute time mark, the dynamic frequency data of band absolute time mark are sent to transformer substation side terminal by 3G wireless network by distributed electrical source.Transformer station's terminal is according to distributed electrical source and transformer substation side frequency data, frequency difference energy integral principle is adopted to differentiate distributed power source running status, by 3G network, the corresponding command is sent to distributed electrical source side termination, solve the grid-connected derivative islanding problem of distributed power source.
Claims (1)
1. an island detection method for the distributed energy of automated security control system, is characterized in that comprising:
The control terminal being installed in distributed electrical source carries out synchro measure frequency to this distributed power source, and stamps markers, and synchro measure frequency data are sent to utility network side by 3G network;
The control terminal being installed in utility network side carries out synchro measure frequency to utility network, and stamps markers, receives the synchro measure frequency data that distributed electrical source send simultaneously;
Be installed in the control terminal of utility network side according to markers, calculate the frequency difference of utility network side and distributed electrical source, if this frequency difference is more than a set action value, then judge island phenomenon occurs; If described frequency difference exceeds a setting initiation value, but do not exceed described set action value, then adopt following formula (1) to calculate frequency difference energy product score value K
df:
…（1）
In formula, Df: the frequency difference of utility network side and distributed electrical source;
If K
dfmore than a frequency difference energy integral setting value, then judge island phenomenon occurs;
The terminal of transformer substation side and the terminal of distributed electrical source unify beat by global clock synchro system, carry out strange land high-speed synchronous sampling, gather electric parameters calculated rate, form the frequency data of band absolute time mark, the dynamic frequency data of band absolute time mark are sent to transformer substation side terminal by 3G wireless network by distributed electrical source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510179630.4A CN104764961B (en) | 2012-12-05 | 2012-12-05 | A kind of island detection method of the distributed energy of automated security control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510179630.4A CN104764961B (en) | 2012-12-05 | 2012-12-05 | A kind of island detection method of the distributed energy of automated security control system |
| CN201210516878.1A CN103036250B (en) | 2012-12-05 | 2012-12-05 | Island detection and control method of distributed energy resource of safety automatic control system |
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| CN201210516878.1A Division CN103036250B (en) | 2012-12-05 | 2012-12-05 | Island detection and control method of distributed energy resource of safety automatic control system |
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| CN201510178932.XA Active CN104764960B (en) | 2012-12-05 | 2012-12-05 | A kind of isolated island detection of distributed energy, control method |
| CN201510179630.4A Active CN104764961B (en) | 2012-12-05 | 2012-12-05 | A kind of island detection method of the distributed energy of automated security control system |
| CN201510179773.5A Active CN104779641B (en) | 2012-12-05 | 2012-12-05 | The island detection method of the distributed energy of automated security control system |
| CN201510179759.5A Active CN104764962B (en) | 2012-12-05 | 2012-12-05 | The isolated island detection of distributed energy, control method |
| CN201210516878.1A Active CN103036250B (en) | 2012-12-05 | 2012-12-05 | Island detection and control method of distributed energy resource of safety automatic control system |
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| CN201510179759.5A Active CN104764962B (en) | 2012-12-05 | 2012-12-05 | The isolated island detection of distributed energy, control method |
| CN201210516878.1A Active CN103036250B (en) | 2012-12-05 | 2012-12-05 | Island detection and control method of distributed energy resource of safety automatic control system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104764960B (en) * | 2012-12-05 | 2017-11-21 | 国网江苏省电力公司常州供电公司 | A kind of isolated island detection of distributed energy, control method |
| US9520819B2 (en) | 2014-02-28 | 2016-12-13 | General Electric Company | System and method for controlling a power generation system based on a detected islanding event |
| CN103944160B (en) * | 2014-04-09 | 2015-10-07 | 国家电网公司 | A kind of distribution network protection based on distributed power generation characteristic and automatics fitting method |
| CN105391033B (en) * | 2015-11-24 | 2018-06-26 | 国网甘肃省电力公司 | Layering for large-scale wind power generation divides domain anti-isolated island guard method |
| CN105372529B (en) * | 2015-11-24 | 2019-03-19 | 国网甘肃省电力公司 | For the power grid isolated island detection of large-scale wind power and anti-isolated island guard method |
| CN106684844B (en) * | 2017-02-21 | 2018-12-04 | 国网山东省电力公司电力科学研究院 | A kind of power distribution network isolated island recognition methods |
| CN111769560B (en) * | 2020-07-17 | 2022-01-25 | 国家电网公司西南分部 | Emergency drop risk control method for power system with photovoltaic power generation |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104764960B (en) | 2017-11-21 |
| CN104779641B (en) | 2017-11-21 |
| CN104779641A (en) | 2015-07-15 |
| CN103036250A (en) | 2013-04-10 |
| CN104764961B (en) | 2017-11-21 |
| CN103036250B (en) | 2015-05-13 |
| CN104764962A (en) | 2015-07-08 |
| CN104764962B (en) | 2017-11-21 |
| CN104764960A (en) | 2015-07-08 |
| WO2014086147A1 (en) | 2014-06-12 |
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Address after: 210024 No. 215 Shanghai Road, Nanjing City, Jiangsu Province Co-patentee after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. CHANGZHOU POWER SUPPLY BRANCH Patentee after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Co-patentee after: State Grid Corporation of China Address before: No. 27, front street, Changzhou Municipal Bureau, Jiangsu Province, Jiangsu Co-patentee before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Patentee before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. CHANGZHOU POWER SUPPLY BRANCH Co-patentee before: State Grid Corporation of China |
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