CN202940577U - Safe automatic control system for islanding detection of distributed energy - Google Patents
Safe automatic control system for islanding detection of distributed energy Download PDFInfo
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- CN202940577U CN202940577U CN 201220662923 CN201220662923U CN202940577U CN 202940577 U CN202940577 U CN 202940577U CN 201220662923 CN201220662923 CN 201220662923 CN 201220662923 U CN201220662923 U CN 201220662923U CN 202940577 U CN202940577 U CN 202940577U
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Abstract
The utility model relates to a safe automatic control system for islanding detection of distributed energy. The system comprises a first control terminal arranged at a distributed power supply side and a second control terminal arranged at a public power grid side, wherein data transmission between the first control terminal and the second control terminal is suitable to be carried out through a 3G network, and the first control terminal is connected with a grid-connected circuit breaker used for being connected with a distributed power supply and a public power grid. After the second control terminal sends a tripping command to the first control terminal, the first control terminal is suitable to control the grid-connected circuit breaker connected with the first control terminal to be tripped.
Description
Technical field
The utility model relates to the power technology field, particularly a kind of automated security control system that detects based on the isolated island that is used for distributed energy of 3G network.
Background technology
So-called isolated island phenomenon, refer in distributed generation system, when mains supply barrier accident or the maintenance and after tripping operation of having a power failure for some reason, thereby the distributed grid-connected electricity generation system of each user side is failed in time to detect power down mode self is cut off electricity network, final formation by be connected with it isolated island electricity generation system of the self-energizing that load forms of distributed power station grid-connected system.The generation meeting of island effect brings serious potential safety hazard to system equipment and related personnel, comprise: (1) island effect make voltage and frequency out of hand, larger fluctuation will occur in the voltage in islanded system and frequency, thereby electrical network and subscriber equipment are caused damage; When (2) islanded system is accessed electrical network again, distributed power generation device during due to reclosing in system may asynchronously with electrical network make release unit be damaged, and may produce very high impulse current, thereby the distributed power generation device in the infringement islanded system even causes electrical network again to trip; (3) island effect may cause fault not remove, thereby causes the infringement of grid equipment, and disturbs the automatic or manual recovery of electrical network normal power supply system; (4) island effect makes some be considered to charged with the circuit of all power supplys disconnections, the danger that this meeting brings electric shock to the related personnel.Therefore in distributed generation system, if can quick obtaining isolated island information and carry out emergency control in the utility network side, can avoid personnel and equipment breakdown 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-island protect of communicating by letter.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 the passive type island protect exists and detects the blind area, and the active alone island protection need to add disturbing signal to system, and can only install at the distributed electrical source.
The utility model content
The technical problems to be solved in the utility model is to propose a kind of automated security control system that is suitable for anti-island protect function.
For solving the problems of the technologies described above, the automated security control system that provides of the present utility model comprises: be installed in the first control terminal of distributed electrical source, be installed in the second control terminal of utility network side; First, second control terminal is suitable for carrying out transfer of data by 3G network; The first control terminal is connected with the circuit breaker that is incorporated into the power networks that is used for being connected distributed power source and utility network.
After the second control terminal sent trip signal to the first control terminal, the first control terminal was suitable for controlling the circuit breaker tripping of being incorporated into the power networks that is connected with this first control terminal.
Be installed in the first control terminal of distributed electrical source, be used for this distributed power source is carried out the synchro measure frequency, and stamp markers, the synchro measure frequency data are sent to the utility network side by 3G network;
Be installed in the second control terminal of utility network side, be used for utility network is carried out the synchro measure frequency, and stamp markers, the synchro measure frequency data that send on described reception distributed electrical source simultaneously;
Be installed in the second control terminal of utility network side according to markers, calculate the frequency difference of utility network side and distributed electrical source, (this setting operating value is generally if this frequency difference surpasses a setting operating value
, the concrete numeric reference company standard Q/GDW617-2011 of State Grid Corporation of China: photovoltaic plant access electric power network technique regulation), send trip signal through the given backward distributed electrical source of time-delay (being generally less than 160 milliseconds); Set startup value (be generally 0.1Hz, this is set the startup value and requires greater than the terminal acquisition precision) if described frequency difference exceeds one, but do not surpass described setting operating value, adopt following formula (1) 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
dfSurpass a frequency difference energy integral set point, send trip signal to the distributed electrical source.
Be installed in the first control terminal of distributed electrical source, after the trip signal that receives the utility network side, the tripping circuit breaker that is incorporated into the power networks is eliminated the islet operation state.
With respect to prior art, the technique effect that scheme of the present utility model has: (1) the utility model is by the frequency of collection 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 from the detection of the circuit breaker isolated island in the utility network side bus scope that is incorporated into the power networks.Set the startup value when frequency difference exceeds, do not surpass when setting operating value, adopt the frequency difference method of energy integral to differentiate, effectively reduced the detection blind area, effectively ensured the isolated island verification and measurement ratio of distributed energy, enlarge the isolated island detection range, improved safe operation of electric network.(2) alone island detection system for distributed energy of the present utility model comprises: synchro measure and control terminal based on 3G network the distributed electrical source, transformer substation side.The terminal of the terminal of transformer substation side and distributed electrical source is unified beat by the global clock synchro system, carry out strange land high-speed synchronous sampling, gather electric parameters and calculate frequency, form the frequency data with absolute time mark, the distributed electrical source will send to the transformer substation side terminal by the 3G wireless network with the dynamic frequency data of absolute time mark.Transformer station's terminal is according to distributed electrical source and transformer substation side frequency data, adopt frequency difference energy integral principle to differentiate the distributed power source running status, by 3G network, the distributed power source lateral terminal is sent the corresponding command, solve the isolated island problem that distributed power source is incorporated into the power networks derivative.
Description of drawings
Fig. 1 is the isolated island testing process schematic diagram of the utility model embodiment;
In figure: Df: for the public network lateral terminal calculates public network side and distributed electrical source difference on the frequency; Fsys: for the public network lateral terminal calculates the public network frequency; Fdg: distributed electrical source frequency; Fset1: set operating value, the given time-delay of Tset1; Kdf: frequency difference energy product score value, Kset2 frequency difference energy set-point;
Fig. 2 is the layout of equipment of distributed power source connecting system automated security control system of the present utility model, and G is wind-force or device of solar generating, loads to be load equipment.
Embodiment
The automated security control system of the present embodiment comprises:
Be installed in the first control terminal of distributed electrical source, be used for this distributed power source is carried out the synchro measure frequency, and stamp markers, the synchro measure frequency data are sent to the utility network side by 3G network;
Be installed in the second control terminal of utility network side, be used for utility network is carried out the synchro measure frequency, and stamp markers, the synchro measure frequency data that send on described reception distributed electrical source simultaneously;
Be installed in the second control terminal of utility network side according to markers, calculate the frequency difference of utility network side and distributed electrical source, (this setting operating value is generally if this frequency difference surpasses a setting operating value
, concrete numerical value also can be with reference to the company standard Q/GDW617-2011 of State Grid Corporation of China: photovoltaic plant access electric power network technique regulation), send trip signal through the given backward distributed electrical source of time-delay (being generally less than 160 milliseconds); Set startup value (be generally 0.1Hz, this is set the startup value and requires greater than the terminal acquisition precision) if described frequency difference exceeds one, but do not surpass described setting operating value, adopt following formula (1) 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
dfSurpass a frequency difference energy integral set point, send trip signal to the distributed electrical source.
Be installed in the first control terminal of distributed electrical source, after the trip signal that receives the utility network side, the tripping circuit breaker that is incorporated into the power networks is eliminated the islet operation state.
Set the startup value when frequency difference exceeds, do not surpass when setting operating value, adopt the frequency difference method of energy integral to differentiate, effectively reduced the detection blind area, effectively ensured the isolated island verification and measurement ratio of distributed energy, enlarge the isolated island detection range, improved safe operation of electric network.
The terminal of the terminal of transformer substation side and distributed electrical source is unified beat by the global clock synchro system, carry out strange land high-speed synchronous sampling, gather electric parameters and calculate frequency, form the frequency data with absolute time mark, the distributed electrical source will send to the transformer substation side terminal by the 3G wireless network with the dynamic frequency data of absolute time mark.Transformer station's terminal is according to distributed electrical source and transformer substation side frequency data, adopt frequency difference energy integral principle to differentiate the distributed power source running status, by 3G network, the distributed power source lateral terminal is sent the corresponding command, solve the isolated island problem that distributed power source is incorporated into the power networks derivative.
Claims (1)
1. an automated security control system that is used for the isolated island detection of distributed energy, is characterized in that comprising: be installed in the first control terminal of distributed electrical source, be installed in the second control terminal of utility network side;
First, second control terminal is suitable for carrying out transfer of data by 3G network;
The first control terminal is connected with the circuit breaker that is incorporated into the power networks that is used for being connected distributed power source and utility network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220662923 CN202940577U (en) | 2012-12-05 | 2012-12-05 | Safe automatic control system for islanding detection of distributed energy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220662923 CN202940577U (en) | 2012-12-05 | 2012-12-05 | Safe automatic control system for islanding detection of distributed energy |
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| Publication Number | Publication Date |
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| CN202940577U true CN202940577U (en) | 2013-05-15 |
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| CN 201220662923 Expired - Fee Related CN202940577U (en) | 2012-12-05 | 2012-12-05 | Safe automatic control system for islanding detection of distributed energy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014086147A1 (en) * | 2012-12-05 | 2014-06-12 | 江苏省电力公司常州供电公司 | Method for detecting and controlling island of distributed energy source of safety automatic control system |
| 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 |
-
2012
- 2012-12-05 CN CN 201220662923 patent/CN202940577U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014086147A1 (en) * | 2012-12-05 | 2014-06-12 | 江苏省电力公司常州供电公司 | Method for detecting and controlling island of distributed energy source of safety automatic control system |
| 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 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130515 Termination date: 20171205 |
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| CF01 | Termination of patent right due to non-payment of annual fee |