CN105305630A - Automatic safety control system for island detection - Google Patents
Automatic safety control system for island detection Download PDFInfo
- Publication number
- CN105305630A CN105305630A CN201510719732.0A CN201510719732A CN105305630A CN 105305630 A CN105305630 A CN 105305630A CN 201510719732 A CN201510719732 A CN 201510719732A CN 105305630 A CN105305630 A CN 105305630A
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- China
- Prior art keywords
- frequency difference
- electrical source
- control terminal
- distributed electrical
- frequency
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- 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.)
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention relates to an automatic safety control system for island detection. The automatic safety control system comprises a control terminal mounted on a distributed power supply side and used for performing synchronous frequency measurement on the distributed power supply, marking a time scale on the distributed power supply and sending synchronous frequency measurement data to a public grid side through a 3G network, and a control terminal mounted on the public grid side and used for performing synchronous frequency measurement on the public grid, marking a time scale on the public grid and receiving the synchronous frequency measurement data sent from the distributed power supply side. The control terminal mounted on the public grid side calculates the frequency difference between the public grid side and the distributed power supply side according to the time scales; if the frequency difference exceeds a set action value, namely, 0.5Hz, a tripping command is sent to the distributed power supply side after a given time delay; if the frequency difference exceeds a set start value but does not exceed the set action value, the frequency difference energy integral value K(df) is calculated; and if K(df) exceeds a frequency difference energy integral set value, a tripping command is sent to the distributed power supply side.
Description
the application is application number: 201210515888.3, and invention and created name is " automated security control system for the islanding detect of distributed energy ", and the applying date is: the divisional application of the application for a patent for invention on December 5th, 2012.
Technical field
The present invention relates to technical field of electric power, particularly a kind of automated security control system of the islanding detect for distributed energy 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 impulse 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 automated security control system being suitable for anti-island protect function.
For solving the problems of the technologies described above, the automated security control system provided of the present invention, comprising:
Be installed in the control terminal of distributed electrical source, for carrying out synchro measure frequency to this distributed power source, and stamp markers, synchro measure frequency data are sent to utility network side by 3G network;
Being installed in the control terminal of utility network side, for carrying out synchro measure frequency to utility network, and stamping markers, receive 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), 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 utility network side and distributed electrical source;
If K
dfmore than a frequency difference energy integral set point, then send trip signal to distributed electrical source.
Be installed in the control terminal of distributed electrical source, after the trip signal of control terminal receiving utility network side, the grid-connected circuit breaker of tripping, eliminates island operation state.
The method of work of described automated security control system, comprising:
Be installed in the control terminal of distributed electrical source, for carrying out synchro measure frequency to this distributed power source, and stamp markers, synchro measure frequency data are sent to utility network side by 3G network;
Being installed in the control terminal of utility network side, for carrying out synchro measure frequency to utility network, and stamping markers, receive 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 after 150 millisecond time-delay, send trip signal to 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 utility network side and distributed electrical source;
If K
dfmore than a frequency difference energy integral set point, then send trip signal to distributed electrical source.
Be installed in the control terminal of distributed electrical source, after the trip signal of control terminal receiving utility network side, the grid-connected circuit breaker of tripping, eliminates island operation state.
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 circuit breaker 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 utility network lateral terminal calculates utility network side and distributed electrical source difference on the frequency; Fsys: for utility 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 equipment layout plan thereof.
Embodiment
The automated security control system of the present embodiment, comprising:
Be installed in the control terminal of distributed electrical source, for carrying out synchro measure frequency to this distributed power source, and stamp markers, synchro measure frequency data are sent to utility network side by 3G network;
Being installed in the control terminal of utility network side, for carrying out synchro measure frequency to utility network, and stamping markers, receive 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 utility network side and distributed electrical source;
If K
dfmore than a frequency difference energy integral set point, then send trip signal to distributed electrical source.
Be installed in the control terminal of distributed electrical source, after the trip signal of control terminal receiving utility network side, the grid-connected circuit breaker 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., for an automated security control system for islanding detect, it is characterized in that comprising:
Be installed in the control terminal of distributed electrical source, for carrying out synchro measure frequency to this distributed power source, and stamp markers, synchro measure frequency data are sent to utility network side by 3G network;
Being installed in the control terminal of utility network side, for carrying out synchro measure frequency to utility network, and stamping markers, receive 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 exceedes set action value 0.5Hz, through given be less than the time delay of 160 milliseconds after send trip signal to distributed electrical source; 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 public network grid side and distributed electrical source;
If K
dfmore than a frequency difference energy integral set point, then send trip signal to distributed electrical source;
Be installed in the control terminal of distributed electrical source, after the trip signal of control terminal receiving utility network side, the grid-connected circuit breaker of tripping, eliminates island operation state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510719732.0A CN105305630B (en) | 2012-12-05 | 2012-12-05 | One kind is used for Automatic safety control system for island detection |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210515888.3A CN102969794B (en) | 2012-12-05 | 2012-12-05 | For the automated security control system of the islanding detect of distributed energy |
| CN201510719732.0A CN105305630B (en) | 2012-12-05 | 2012-12-05 | One kind is used for Automatic safety control system for island detection |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210515888.3A Division CN102969794B (en) | 2012-12-05 | 2012-12-05 | For the automated security control system of the islanding detect of distributed energy |
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| Publication Number | Publication Date |
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| CN105305630A true CN105305630A (en) | 2016-02-03 |
| CN105305630B CN105305630B (en) | 2017-11-21 |
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| CN201510719197.9A Active CN105375531B (en) | 2012-12-05 | 2012-12-05 | Method of work for Automatic safety control system for island detection |
| CN201510719147.0A Active CN105305629B (en) | 2012-12-05 | 2012-12-05 | Method of work for the Automatic safety control system for island detection of distributed energy |
| CN201510719732.0A Active CN105305630B (en) | 2012-12-05 | 2012-12-05 | One kind is used for Automatic safety control system for island detection |
| CN201510719486.9A Active CN105245008B (en) | 2012-12-05 | 2012-12-05 | A kind of Automatic safety control system for island detection for distributed energy |
| CN201510716859.7A Active CN105281437B (en) | 2012-12-05 | 2012-12-05 | For Automatic safety control system for island detection |
| CN201210515888.3A Active CN102969794B (en) | 2012-12-05 | 2012-12-05 | For the automated security control system of the islanding detect of distributed energy |
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| CN201510719147.0A Active CN105305629B (en) | 2012-12-05 | 2012-12-05 | Method of work for the Automatic safety control system for island detection of distributed energy |
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| CN201510716859.7A Active CN105281437B (en) | 2012-12-05 | 2012-12-05 | For Automatic safety control system for island detection |
| CN201210515888.3A Active CN102969794B (en) | 2012-12-05 | 2012-12-05 | For the automated security control system of the islanding detect of distributed energy |
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| CN104779641B (en) * | 2012-12-05 | 2017-11-21 | 国网江苏省电力公司常州供电公司 | The island detection method of the distributed energy of automated security control system |
| CN103296643B (en) * | 2013-03-19 | 2017-02-22 | 昆明理工大学 | Comparative isolated island detection and protection method based on wide range information phase difference |
| 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 |
| CN105262067B (en) * | 2015-10-08 | 2018-02-02 | 南京南瑞继保电气有限公司 | A kind of anti-isolated island protection system and method |
| CN106443501B (en) * | 2016-10-27 | 2017-10-20 | 广东电网有限责任公司茂名供电局 | Distributed generator islanding detection method and system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105375531B (en) | 2017-11-21 |
| CN105305630B (en) | 2017-11-21 |
| CN102969794A (en) | 2013-03-13 |
| CN105281437A (en) | 2016-01-27 |
| CN105375531A (en) | 2016-03-02 |
| CN105305629A (en) | 2016-02-03 |
| CN105305629B (en) | 2017-11-21 |
| CN105245008A (en) | 2016-01-13 |
| CN105245008B (en) | 2017-11-21 |
| CN105281437B (en) | 2017-11-21 |
| CN102969794B (en) | 2015-11-18 |
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Inventor after: Lu Zheng Inventor after: Zhu Haiyu Inventor after: Cao Liang Inventor before: Cao Liang |
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Address after: 213003 No. 27, West Front Street, Changzhou, Jiangsu Co-patentee after: STATE GRID JIANGSU ELECTRIC POWER COMPANY Patentee after: State Grid Jiangsu Electric Power Company, Changzhou Power Supply Company Co-patentee after: State Grid Corporation of China Address before: 213003 Jiangsu province Changzhou City Tianning District Bureau Street No. 27 Co-patentee before: Jiangsu Electric Power Company Patentee before: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. Co-patentee before: State Grid Corporation of China |