CN103036250A - Island detection and control method of distributed energy resource of safety automatic control system - Google Patents

Island detection and control method of distributed energy resource of safety automatic control system Download PDF

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Publication number
CN103036250A
CN103036250A CN2012105168781A CN201210516878A CN103036250A CN 103036250 A CN103036250 A CN 103036250A CN 2012105168781 A CN2012105168781 A CN 2012105168781A CN 201210516878 A CN201210516878 A CN 201210516878A CN 103036250 A CN103036250 A CN 103036250A
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China
Prior art keywords
network
distributed
frequency difference
frequency
control
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CN2012105168781A
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CN103036250B (en
Inventor
曹良
何晓明
罗皎虹
奚汉江
王强强
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Changzhou Power Supply Co of Jiangsu Electric Power Co
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Changzhou Power Supply Co of Jiangsu Electric Power Co
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388Islanding, i.e. disconnection of local power supply from the network

Abstract

The invention relates to an island detection and control method of a distributed energy resource of a safety automatic control system. The island detection and control method of the distributed energy resource of the safety automatic control system comprises the following steps: synchronous measurement of frequency of a distributed power supply is carried out by a control terminal installed on the side of the distributed power supply, time scales are stamped, and synchronously measured frequency data are sent to the side of an utility grid through the 3rd-generation (3G) network; synchronous measurement of frequency of the utility grid is carried out by a control terminal installed on the side of the utility grid, time scales are stamped, and the synchronously measured frequency data sent from the side of the distributed power supply is received; the control terminal installed on the side of the utility grid calculates frequency difference between the side of the utility grid and the side of the distributed power supply according to the time scales; if the frequency difference exceeds a set operate value, a trip command is sent to the side of the distributed power supply after a delay of given time; if the frequency difference exceeds a set starting value and does not exceed the set operate value, a frequency difference energy integral value Kdf needs to be calculated; and if Kdf exceeds a set frequency difference energy integral value, a trip command is sent to the side of the distributed power supply.

Description

The isolated island of the distributed energy of automated security control system detects, control method
Technical field
The present invention relates to the power technology field, particularly a kind of isolated island of distributed energy of the automated security control system based on 3G network detect, control method.
Background technology
So-called isolated island phenomenon, refer in the distributed generation system, when for some reason barrier accident or the maintenance and after the tripping operation of having a power failure of mains supply, 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 link to each other 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 makes voltage and frequency out of hand, larger fluctuation will occur in the voltage in the 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 owing to reclosing in the 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 cause 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 of electrical network normal power supply system to recover; (4) island effect is so that some are 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.
Summary of the invention
The technical problem to be solved in the present invention is that the isolated island that proposes a kind of distributed energy of the automated security control system that is suitable for anti-island protect function detects, control method.
For solving the problems of the technologies described above, the isolated island of the distributed energy of the automated security control system that provides of the present invention detects, control method, comprises the steps:
The control terminal that is installed in the distributed electrical source carries out the synchro measure frequency to this distributed power source, and stamps markers, and the synchro measure frequency data are sent to the utility network side by 3G network;
The control terminal that is installed in the utility network side carries out the synchro measure frequency to utility network, and stamps markers, the synchro measure frequency data that send on the described reception distributed electrical source 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, (this setting operating value is generally if this frequency difference surpasses a setting operating value , the concrete company standard Q/GDW617-2011 of numeric reference 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, then adopt following formula (1) to calculate frequency difference energy product score value K Df:
??…(1)
In the formula, Df: the frequency difference of public network side and distributed electrical source;
If K DfSurpass a frequency difference energy integral set point, then send trip signal to the distributed electrical source.
Be installed in the control terminal of distributed electrical source, behind 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 the solution of the present invention has: (1) the present invention 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 invention 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 be crossed the 3G wireless network with the dynamic frequency data communication device of absolute time mark and send to the transformer substation side terminal.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 and derives.
Description of drawings
Fig. 1 is the isolated island testing process schematic diagram of the embodiment of the invention;
Among the 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 distributed power source connecting system automated security control system of the present invention and terminal equipment layout plan thereof.
 
Embodiment
The isolated island of the distributed energy of the automated security control system of present embodiment detects, control method, comprises the steps:
The control terminal that is installed in the distributed electrical source carries out the synchro measure frequency to this distributed power source, and stamps markers, and the synchro measure frequency data are sent to the utility network side by 3G network;
The control terminal that is installed in the utility network side carries out the synchro measure frequency to utility network, and stamps markers, the synchro measure frequency data that send on the described reception distributed electrical source 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, (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, then adopt following formula (1) to calculate frequency difference energy product score value K Df:
??…(1)
In the formula, Df: the frequency difference of public network side and distributed electrical source;
If K DfSurpass a frequency difference energy integral set point, then send trip signal to the distributed electrical source.
Be installed in the control terminal of distributed electrical source, behind 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 be crossed the 3G wireless network with the dynamic frequency data communication device of absolute time mark and send to the transformer substation side terminal.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 and derives.

Claims (1)

1. the isolated island of the distributed energy of automated security control system detection, control method is characterized in that comprising:
The control terminal that is installed in the distributed electrical source carries out the synchro measure frequency to this distributed power source, and stamps markers, and the synchro measure frequency data are sent to the utility network side by 3G network;
The control terminal that is installed in the utility network side carries out the synchro measure frequency to utility network, and stamps markers, the synchro measure frequency data that send on the described reception distributed electrical source 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, set operating value if this frequency difference surpasses one, send trip signal through the given backward distributed electrical source of time-delay; Set the startup value if described frequency difference exceeds one, but do not surpass described setting operating value, then adopt following formula (1) to calculate frequency difference energy product score value K Df:
??…(1)
In the formula, Df: the frequency difference of public network side and distributed electrical source;
If K DfSurpass a frequency difference energy integral set point, then send trip signal to the distributed electrical source;
Be installed in the control terminal of distributed electrical source, behind 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.
CN201210516878.1A 2012-12-05 2012-12-05 Island detection and control method of distributed energy resource of safety automatic control system Active CN103036250B (en)

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CN201510179759.5A CN104764962B (en) 2012-12-05 2012-12-05 The isolated island detection of distributed energy, control method
CN201510179773.5A CN104779641B (en) 2012-12-05 2012-12-05 The 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
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
CN201510178932.XA CN104764960B (en) 2012-12-05 2012-12-05 A kind of isolated island detection of distributed energy, control method
PCT/CN2013/079394 WO2014086147A1 (en) 2012-12-05 2013-07-15 Method for detecting and controlling island of distributed energy source of safety automatic control system

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CN201510179773.5A Division CN104779641B (en) 2012-12-05 2012-12-05 The island detection method of the distributed energy of automated security control system
CN201510178932.XA Division CN104764960B (en) 2012-12-05 2012-12-05 A kind of isolated island detection of distributed energy, control method
CN201510179630.4A Division 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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CN103944160A (en) * 2014-04-09 2014-07-23 国家电网公司 Distribution network protection and automatic device cooperating method based on DG characteristics
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WO2014086147A1 (en) 2014-06-12
CN103036250B (en) 2015-05-13
CN104764962B (en) 2017-11-21
CN104764960A (en) 2015-07-08
CN104764960B (en) 2017-11-21
CN104764962A (en) 2015-07-08
CN104764961A (en) 2015-07-08
CN104779641A (en) 2015-07-15
CN104764961B (en) 2017-11-21

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