CN102255330A - Device and method for detecting island of micro power grid system - Google Patents

Device and method for detecting island of micro power grid system Download PDF

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Publication number
CN102255330A
CN102255330A CN201110097401XA CN201110097401A CN102255330A CN 102255330 A CN102255330 A CN 102255330A CN 201110097401X A CN201110097401X A CN 201110097401XA CN 201110097401 A CN201110097401 A CN 201110097401A CN 102255330 A CN102255330 A CN 102255330A
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CN
China
Prior art keywords
grid
micro
control unit
isolated island
voltage
Prior art date
Application number
CN201110097401XA
Other languages
Chinese (zh)
Inventor
李朝晖
王璟
余晓鹏
杨海晶
王洋
刘巍
周逢权
马红伟
杨湛晔
Original Assignee
河南电力试验研究院
许继电气股份有限公司
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Priority to CN201110097401XA priority Critical patent/CN102255330A/en
Publication of CN102255330A publication Critical patent/CN102255330A/en

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Smart grids as climate change mitigation technology in the energy generation sector
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation

Abstract

The invention discloses a device for detecting island of a micro power grid system. The device comprises a micro power grid control system and an on-grid and off-grid controller, wherein the on-grid and off-grid controller comprises a protective control unit, an analogue quantity collecting module, a state quantity information collecting module, a trip outlet module and a power supply; the signal output ends of the analogue quantity collecting module and the state quantity information collecting module are connected with the signal input end of the protective control unit; the protective control unit is connected with the micro power grid control system or an energy storage device through the trip outlet module; and the on-grid and off-grid controller is also communicated with the micro power grid control system or the energy storage device through a communication management module. According to the invention, the voltage, current and switch state quantity information of the micro power grid is detected through the on-grid and off-grid controller, whether island occurs is determined, the micro power grid island detection is realized, and a basis for grid and off-grid detection is provided, thus the popularization and applications of the on-grid and off-grid are promoted.

Description

A kind of apparatus and method that detect micro-grid system generation isolated island
Technical field
The present invention relates to little electrical network field, relate in particular to a kind of apparatus and method that detect micro-grid system generation isolated island.
Background technology
At present, the generation time and again in big electrical network of energy shortage, environmental pollution and cascading failure has all become electrical production and safe and stable operation inevitable problem.Meanwhile, based on the rise of the distributing-supplying-energy technology of regenerative resource, power system security and flexibility provide new thinking in order to reduce investment outlay, to cut down the consumption of energy and to pollute, to improve.Little electric power network technique can be combined multiple inverse distributed power in addition unified energy control, and little electrical network and traditional electrical network combine also and to be thought power system development trend by domestic and international expert is consistent.Yet along with the fast development of distributed power generation technology, the protection of little electrical network and control technology have but become the bottleneck that limits its development.At present conventional little electrical network island detection method normally proposes at distributed power generation equipment or energy storage device, its prerequisite is that these equipment are generating equipments, these equipment are in the mode of operation that is incorporated into the power networks usually, thereby its detection method can't satisfy little electrical network from network operation and and the requirement of switching from net, how remove to discern isolated island and but rarely have and mention from the angle of a system.
Summary of the invention
The purpose of this invention is to provide a kind of apparatus and method that detect micro-grid system generation isolated island, solved the problem of little electrical network island detection, for and provide the foundation from net conversion.
The present invention adopts following technical proposals: a kind of device that detects micro-grid system generation isolated island, comprise little grid control system, also comprise and from net controller, described and comprise the protection control unit from net controller, analogue collection module, trip signal outlet module and power supply, analogue collection module is used to gather the alternating current of network system to micro-grid system output, information of voltage, the signal output part of analogue collection module is connected with the signal input part of protection control unit, and the protection control unit is connected with little grid control system or energy storage device by the tripping operation outlet module; The signal output part of described protection control unit also is connected with the communication management module, is used for carrying out communication with little grid control system, energy storage device.
Also include the quantity of state information acquisition module; the quantity of state information acquisition module is used for gathering position of the switch information, protection that micro-grid system and network system link and throws and move back information, GPS pulse signal, and the signal output part of quantity of state information acquisition module is connected with the signal input part of protecting control unit.
The signal input part of described protection control unit is connected with keyboard, and signal output part is connected with display.
A kind of method that detects micro-grid system generation isolated island may further comprise the steps: (1), the real-time detection of grid of protection control unit system are to alternating current, the information of voltage of micro-grid system output, the on off state amount information that little electrical network and network system link; (2), protecting control unit that the detection data are carried out computational analysis draws the amount that need judge, whether the judgement of isolated island takes place; (3), if isolated island takes place, then protect control unit to send the isolated island control command and give little grid control system or energy storage device, little grid control system or energy storage device are carried out corresponding actions.
The Rule of judgment of the isolated island in the described step (2) is: and determine always that from the inlet wire positive sequence component negative side of net controller by judging little electrical network little electrical network external system breaks down; And then each data are judged: if micro-grid system voltage during greater than the harmonic content definite value, then just can be judged little electrical network generation isolated island greater than frequency change rate definite value or micro-grid system voltage harmonic greater than voltage change ratio definite value or micro-grid system frequency change rate less than under-frequency definite value or micro-grid system voltage change ratio greater than overfrequency definite value or micro-grid system frequency less than under-voltage definite value or micro-grid system frequency less than overvoltage definite value or micro-grid system voltage.
The voltage harmonic of the micro-grid system in the described step (2) comprises second harmonic and triple-frequency harmonics.
The present invention is on the basis that present distributed generator islanding examination criteria is analyzed, proposition is applicable to the island detection technology of micro-grid system, by and from voltage, electric current and the on off state amount information of net controller detection of grid, judge whether to take place isolated island, solved the problem of little electrical network island detection, and for and provide the foundation from net conversion, with traditional island detection contrast at distributed power generation equipment or energy storage device proposition, the island detection that the method for the invention makes little electrical network more accurately and reliably, thereby promote applying of little electrical network.
Description of drawings
Fig. 1 among the present invention and from the circuit block diagram of net controller.
Embodiment
As shown in Figure 1; the device that the present invention detects micro-grid system generation isolated island comprises little electrical network and from net controller; and from net controller by the protection control unit; analogue collection module; the trip signal outlet module; quantity of state information acquisition module and power supply are formed; analogue collection module is used to gather the alternating current of network system to micro-grid system output; information of voltage; the quantity of state information acquisition module is used for gathering the position of the switch information that micro-grid system and network system link; the information of moving back is thrown in protection; GPS pulse signal, the signal output part of the signal output part of analogue collection module and quantity of state information acquisition module all are connected by the signal input part of bus with the protection control unit.The signal output part of protection control unit after logical operation is connected with little grid control system or energy storage device by the trip signal outlet module.The signal input part of protection control unit is connected with keyboard, and signal output part is connected with display; Its output also is connected with the communication management module, is used for and little grid control system or energy storage device communication, or/and printer is connected with the debugging PC.
When micro-grid system generation external fault, little electrical network is owing to lose the support of big electrical network, and its voltage and frequency can have greatly changed, and inner distributed power source can output short circuit current to big grid short circuit point simultaneously.For low-permeability, weak receiving end micro-grid system, voltage when isolated island takes place, frequency, very big variation will be arranged with the exchange power of big electrical network, therefore can determine the generation of little electrical network isolated island with this by the rate of change of voltage, frequency, exchange power etc. is judged.Simultaneously, when isolated island took place, inverter can inject harmonic current to load, and nonlinear load also can make voltage produce distortion, and the harmonic content that therefore detects voltage can judge whether to take place isolated island.
Comprise among the present invention and from the step that net controller detects micro-grid system generation isolated island: (1), protection control unit are gathered micro-grid system by the quantity of state information acquisition module and are moved back information, GPS pulse signal with position of the switch information, protection throwing that network system links by alternating current, the information of voltage of the real-time detection of grid of analogue collection module system to micro-grid system output; (2), the protection control unit carries out the amount that computational analysis draws needs judgement to detection information: voltage change ratio and frequency change rate, voltage harmonic; Whether the judgement of isolated island takes place then: at first and from net controller determine always that by judging inlet wire positive sequence component negative side little electrical network external system breaks down, then each data are judged: if micro-grid system voltage is less than the overvoltage definite value, or micro-grid system voltage is less than under-voltage definite value, or the micro-grid system frequency is greater than the overfrequency definite value, or the micro-grid system frequency is less than the under-frequency definite value, or the micro-grid system voltage change ratio is greater than the voltage change ratio definite value, or the micro-grid system frequency change rate is greater than the frequency change rate definite value, or micro-grid system voltage harmonic (comprising second harmonic and triple-frequency harmonics) then just can be judged little electrical network generation isolated island during greater than the harmonic content definite value; (3), if little electrical network generation isolated island; then protect control unit to send the isolated island control command and give little grid control system or energy storage device by the trip signal outlet module; little grid control system or energy storage device are carried out corresponding actions; excise getting in touch of little electrical network and extraneous electrical network rapidly, little electrical network enters from the network operation state.The overvoltage definite value of wherein said little electrical network, under-voltage definite value, overfrequency definite value, under-frequency definite value, overfrequency definite value, frequency change rate definite value, voltage change ratio definite value, harmonic content definite value and various actions time definite value are with reference to IEEE Std.929-2000/UL17410(normative reference), determine by Theoretical Calculation and operation test.Simultaneously little electrical network and have from net controller and to revise the function of setting definite value can be provided with different definite values according to the electrical network situation.

Claims (6)

1. device that detects micro-grid system generation isolated island, comprise little grid control system, it is characterized in that: also comprise and from net controller, described and comprise protection control unit, analogue collection module, trip signal outlet module and power supply from net controller, analogue collection module is used to gather alternating current, the information of voltage of network system to micro-grid system output, the signal output part of analogue collection module is connected with the signal input part of protection control unit, and the protection control unit is connected with little grid control system or energy storage device by the tripping operation outlet module; The signal output part of described protection control unit also is connected with the communication management module, is used for carrying out communication with little grid control system, energy storage device.
2. the device of detection micro-grid system generation isolated island according to claim 1; it is characterized in that: also include the quantity of state information acquisition module; the quantity of state information acquisition module is used for gathering position of the switch information, protection that micro-grid system and network system link and throws and move back information, GPS pulse signal, and the signal output part of quantity of state information acquisition module is connected with the signal input part of protecting control unit.
3. the device of detection micro-grid system isolated island according to claim 2 is characterized in that: the signal input part of described protection control unit is connected with keyboard, and signal output part is connected with display.
4. method that detects micro-grid system generation isolated island, it is characterized in that: may further comprise the steps: (1), the real-time detection of grid of protection control unit system are to alternating current, the information of voltage of micro-grid system output, the on off state amount information that little electrical network and network system link; (2), protecting control unit that the detection data are carried out computational analysis draws the amount that need judge, whether the judgement of isolated island takes place; (3), if isolated island takes place, then protect control unit to send the isolated island control command and give little grid control system or energy storage device, little grid control system or energy storage device are carried out corresponding actions.
5. according to the method for the described detection micro-grid system of claim 5 generation isolated island, it is characterized in that: the Rule of judgment of the isolated island in the described step (2) is: and determine always that from the inlet wire positive sequence component negative side of net controller by judging little electrical network little electrical network external system breaks down; And then each data are judged: if micro-grid system voltage during greater than the harmonic content definite value, then just can be judged little electrical network generation isolated island greater than frequency change rate definite value or micro-grid system voltage harmonic greater than voltage change ratio definite value or micro-grid system frequency change rate less than under-frequency definite value or micro-grid system voltage change ratio greater than overfrequency definite value or micro-grid system frequency less than under-voltage definite value or micro-grid system frequency less than overvoltage definite value or micro-grid system voltage.
6. the method for detection micro-grid system generation isolated island according to claim 5 is characterized in that: the voltage harmonic of the micro-grid system in the described step (2) comprises second harmonic and triple-frequency harmonics.
CN201110097401XA 2011-04-19 2011-04-19 Device and method for detecting island of micro power grid system CN102255330A (en)

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Cited By (20)

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CN102707164A (en) * 2012-03-20 2012-10-03 广东电网公司电力科学研究院 Field experimental method for simulating isolated network
CN103323695A (en) * 2013-05-16 2013-09-25 国家电网公司 Device and method for automatically loading anti-islanding protection test system
CN103336205A (en) * 2013-06-27 2013-10-02 新疆希望电子有限公司 Island effect detection system and method during simultaneous injection of two harmonic current
CN103475023A (en) * 2013-09-09 2013-12-25 国家电网公司 On/off-grid control method for microgrid with a plurality of distributed power supplies
CN103728522A (en) * 2014-01-21 2014-04-16 武汉理工大学 Satellite timing and management network based micro power grid islanding detection method and system
CN104009453A (en) * 2014-06-12 2014-08-27 国网上海市电力公司 Method for detecting faults generated in off-network operating process of micro grid
CN104659809A (en) * 2015-01-26 2015-05-27 国网浙江海盐县供电公司 Anti-islanding grid-connection intelligent switch protection method for distributed type power supply system and grid-connection intelligent switch device
CN104764962A (en) * 2012-12-05 2015-07-08 江苏省电力公司常州供电公司 Island detection and control method of distributed energy
CN105245008A (en) * 2012-12-05 2016-01-13 江苏省电力公司常州供电公司 Safety automatic control system for island detection of distributed energy
CN105322516A (en) * 2015-03-17 2016-02-10 国家电网公司 Micro-grid protection method
CN105958430A (en) * 2016-04-27 2016-09-21 上海电气分布式能源科技有限公司 Load fixed value switching method and 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
CN106253336A (en) * 2016-08-19 2016-12-21 长园深瑞继保自动化有限公司 Distributed power source isolated island effect prevention relay protecting method
CN107976609A (en) * 2017-11-27 2018-05-01 王建安 A kind of isolated network identifying system and method
CN108008218A (en) * 2017-11-27 2018-05-08 王建安 A kind of micro-, minor scale power net running rate recognizing method
CN108051665A (en) * 2017-11-17 2018-05-18 国家电网公司 A kind of anti-isolated island alarm device of grid-connected system
CN108233423A (en) * 2018-02-27 2018-06-29 合肥工业大学 Grid-connected power generation system is incorporated to the adaptive island detection method of AC-DC hybrid power grid
CN109103855A (en) * 2018-09-28 2018-12-28 广东电网有限责任公司 A kind of isolated island micro-capacitance sensor line protection method, device and storage medium
CN111130134A (en) * 2019-10-18 2020-05-08 国网冀北电力有限公司承德供电公司 Island detection method based on system simulation
CN111245003A (en) * 2018-11-29 2020-06-05 北京金风科创风电设备有限公司 Island protection method and device for renewable energy source station

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CN101834431A (en) * 2010-05-21 2010-09-15 深圳市科陆电子科技股份有限公司 Method for preventing grid-connected island effect of distributed power source
CN202084950U (en) * 2011-04-19 2011-12-21 河南电力试验研究院 Device for detecting generation of island in micro power grid system

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CN1972059A (en) * 2006-12-06 2007-05-30 中国科学院电工研究所 A micro power network system
CN101834431A (en) * 2010-05-21 2010-09-15 深圳市科陆电子科技股份有限公司 Method for preventing grid-connected island effect of distributed power source
CN202084950U (en) * 2011-04-19 2011-12-21 河南电力试验研究院 Device for detecting generation of island in micro power grid system

Cited By (39)

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Publication number Priority date Publication date Assignee Title
CN102707164A (en) * 2012-03-20 2012-10-03 广东电网公司电力科学研究院 Field experimental method for simulating isolated network
CN105305629A (en) * 2012-12-05 2016-02-03 江苏省电力公司常州供电公司 Working method of automatic safety control system for island detection of distributed energy sources
CN104764962B (en) * 2012-12-05 2017-11-21 国网江苏省电力公司常州供电公司 The isolated island detection of distributed energy, control method
CN105305630B (en) * 2012-12-05 2017-11-21 江苏省电力公司常州供电公司 One kind is used for Automatic safety control system for island detection
CN105245008B (en) * 2012-12-05 2017-11-21 江苏省电力公司常州供电公司 A kind of Automatic safety control system for island detection for distributed energy
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
CN105375531B (en) * 2012-12-05 2017-11-21 江苏省电力公司常州供电公司 Method of work for Automatic safety control system for island detection
CN105281437B (en) * 2012-12-05 2017-11-21 江苏省电力公司常州供电公司 For Automatic safety control system for island detection
CN104764962A (en) * 2012-12-05 2015-07-08 江苏省电力公司常州供电公司 Island detection and control method of distributed energy
CN104764960A (en) * 2012-12-05 2015-07-08 江苏省电力公司常州供电公司 Distributed energy island detection and control method
CN104764961A (en) * 2012-12-05 2015-07-08 江苏省电力公司常州供电公司 Island detection method for distributed energy resources of automatic safety control system
CN104779641A (en) * 2012-12-05 2015-07-15 江苏省电力公司常州供电公司 Distributed energy island detection method of automatic safety control system
CN105245008A (en) * 2012-12-05 2016-01-13 江苏省电力公司常州供电公司 Safety automatic control system for island detection of distributed energy
CN105375531A (en) * 2012-12-05 2016-03-02 江苏省电力公司常州供电公司 Work method of safe automatic control system for island detection
CN105305630A (en) * 2012-12-05 2016-02-03 江苏省电力公司常州供电公司 Automatic safety control system for island detection
CN105305629B (en) * 2012-12-05 2017-11-21 江苏省电力公司常州供电公司 Method of work for the Automatic safety control system for island detection of distributed energy
CN104764961B (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 island detection method of the distributed energy of automated security control system
CN103323695B (en) * 2013-05-16 2016-01-20 国家电网公司 Anti-island protect test macro automatic loading device and method thereof
CN103323695A (en) * 2013-05-16 2013-09-25 国家电网公司 Device and method for automatically loading anti-islanding protection test system
CN103336205A (en) * 2013-06-27 2013-10-02 新疆希望电子有限公司 Island effect detection system and method during simultaneous injection of two harmonic current
CN103475023B (en) * 2013-09-09 2014-09-03 国家电网公司 On/off-grid control method for microgrid with a plurality of distributed power supplies
CN103475023A (en) * 2013-09-09 2013-12-25 国家电网公司 On/off-grid control method for microgrid with a plurality of distributed power supplies
CN103728522B (en) * 2014-01-21 2016-03-09 武汉理工大学 Based on micro-grid island detection method and the system of satellite time transfer and supervising the network
CN103728522A (en) * 2014-01-21 2014-04-16 武汉理工大学 Satellite timing and management network based micro power grid islanding detection method and 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
CN104009453B (en) * 2014-06-12 2017-03-29 国网上海市电力公司 A kind of fault detection method for micro-capacitance sensor off-grid operation situation
CN104009453A (en) * 2014-06-12 2014-08-27 国网上海市电力公司 Method for detecting faults generated in off-network operating process of micro grid
CN104659809A (en) * 2015-01-26 2015-05-27 国网浙江海盐县供电公司 Anti-islanding grid-connection intelligent switch protection method for distributed type power supply system and grid-connection intelligent switch device
CN105322516A (en) * 2015-03-17 2016-02-10 国家电网公司 Micro-grid protection method
CN105958430A (en) * 2016-04-27 2016-09-21 上海电气分布式能源科技有限公司 Load fixed value switching method and method
CN106253336A (en) * 2016-08-19 2016-12-21 长园深瑞继保自动化有限公司 Distributed power source isolated island effect prevention relay protecting method
CN106253336B (en) * 2016-08-19 2018-11-13 长园深瑞继保自动化有限公司 Distributed generation resource isolated island effect prevention relay protecting method
CN108051665A (en) * 2017-11-17 2018-05-18 国家电网公司 A kind of anti-isolated island alarm device of grid-connected system
CN107976609A (en) * 2017-11-27 2018-05-01 王建安 A kind of isolated network identifying system and method
CN108008218A (en) * 2017-11-27 2018-05-08 王建安 A kind of micro-, minor scale power net running rate recognizing method
CN108233423A (en) * 2018-02-27 2018-06-29 合肥工业大学 Grid-connected power generation system is incorporated to the adaptive island detection method of AC-DC hybrid power grid
CN109103855A (en) * 2018-09-28 2018-12-28 广东电网有限责任公司 A kind of isolated island micro-capacitance sensor line protection method, device and storage medium
CN111245003A (en) * 2018-11-29 2020-06-05 北京金风科创风电设备有限公司 Island protection method and device for renewable energy source station
CN111130134A (en) * 2019-10-18 2020-05-08 国网冀北电力有限公司承德供电公司 Island detection method based on system simulation

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