CN101834431A - Method for preventing grid-connected island effect of distributed power source - Google Patents

Method for preventing grid-connected island effect of distributed power source Download PDF

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Publication number
CN101834431A
CN101834431A CN201010186684A CN201010186684A CN101834431A CN 101834431 A CN101834431 A CN 101834431A CN 201010186684 A CN201010186684 A CN 201010186684A CN 201010186684 A CN201010186684 A CN 201010186684A CN 101834431 A CN101834431 A CN 101834431A
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China
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distribution network
power source
distributed power
incorporated
voltage
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CN201010186684A
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Chinese (zh)
Inventor
崔丰曦
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深圳市科陆电子科技股份有限公司
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Priority to CN201010186684A priority Critical patent/CN101834431A/en
Publication of CN101834431A publication Critical patent/CN101834431A/en

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Abstract

The invention discloses a method for preventing a grid-connected island effect of a distributed power source. A distribution network terminal is arranged at a distribution network terminal and is respectively connected with a distribution network and a distributed power source through feeder wires. The method for preventing the grid-connected island effect of the distributed power source comprises the following steps of: (a) acquiring the running state quantity of a distribution feeder wire and a distributed power source grid-connected feeder wire by using the distribution network terminal; (b) processing the acquired state quantity in the distribution network terminal to obtain the running conditions of the distribution network and the distributed power source; and (c) processing the grid-connected state of the distributed power source according to the running conditions of the distribution network and the distributed power source. The invention solves the problem of the detection of the side island effect of a grid-connected inverter in the grid-connected running process of the distributed power source and effectively prevents the island effect of the distributed power source caused by grid connection.

Description

A kind of method that prevents grid-connected island effect of distributed power source
Technical field
The present invention relates to the power supply and distribution of electric power technical field, especially relate to a kind of distribution network terminal and distributed power source interconnection technology,
Background technology
Power industry standard DL/T721-2000 " distribution automation system terminal unit " is defined as the distribution automation system terminal unit: the distribution automation system terminal unit is the general designation of various distribution terminal units, distribution transformer terminal unit and the pressure monitoring unit equipment such as (power distribution automation and management system substations) that is used for the power distribution network distribution loop.Adopt communication port to finish functions such as data acquisition and distant place control.
Distributed power generation (Distributed Generation, be called for short DG) be meant utilize be distributed near the Blast Furnace Top Gas Recovery Turbine Unit (TRT) economy load, middle and small scale, efficiently, generating reliably.The energy crisis of global range and environmental crisis make the development and utilization of emerging energy become a kind of urgent demand.Distributed power generation technology based on utilization of new energy resources also more and more is subject to people's attention.Many countries have put into effect preferential policy, encourage to use distributed power generation, simultaneously, along with developing rapidly of science and technology, the advantage of distributed power generation also manifests gradually, cause the operation that is connected to the grid of increasing distributed power source, and that distributed power generation is incorporated into the power networks is also more and more serious to the influence of power distribution network operation.
Because the Capacity Ratio of DG unit is less, the influence of receiving load variations easily.And distributed power generation belong to emerging technology, some control and operation measure are also not too perfect, also further developing, so the DG set grid-connection may bring some factors of instability to electric power system.When DG unit and electric power system were incorporated into the power networks, unit provided electric energy and all should be controlled to the quality that electrical network sends electric energy to local AC load, is satisfying practicality and conformance with standard aspect voltage, fluctuation, frequency, harmonic wave and the power factor.When the out-of-limit situation that standard (voltage sag, hit etc.) occur departing from, the DG system should be separated with electrical network.
The combining inverter of each distributed power generation user side phenomenon of independent operating still when island effect is meant and causes the electrical network interruption of power supply owing to reasons such as electric fault, misoperation or natural causes.In general, island effect may cause adverse influence to whole power distribution system equipment and user's equipment, comprises the safety that jeopardizes maintenance personal on the grid power transmission circuit; Influence the operation program of the protection switch on the distribution system, impact the electric network protection device; Influence the electric energy transmitting quality, the supply power voltage in electric power isolated island zone and frequency are with instability; After recovering, mains supply can cause phase place asynchronous; Single-phase distributed generation system can cause system's threephase load to owe to power mutually.Therefore must be able to carry out island effect for a grid-connected system detects.
The island effect detection technique mainly can be divided into the detection of active detection and passive type in the combining inverter side at present.The parameters that isolated island forms moment DG output spike can occur usually; passive mode is mainly utilized this transient fluctuation; detect the formation of isolated island by calculating total percent harmonic distortion (THD) or Voltage unbalance degree (VU); during near the big load switching of this detection method DG; can produce misoperation; when DG output and the basic coupling of zone load, can not effectively distinguish the formation of isolated island simultaneously.
Active method is in DG output, artificially introduces a little voltage or a frequency disturbance, and under the isolated island condition, this class disturbance meeting causes the instability of voltage or frequency, thereby finally causes DG to disconnect.The defective of these class methods is: on the one hand under the situation of regional power grid heavy load, and misoperation easily.On the other hand, when a large amount of DG connecting system, these artificial positive feedbacks of introducing bring bigger influence will for the quality of power supply of public network.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that prevents grid-connected island effect of distributed power source, overcome the existing distributed power source problem that combining inverter side island effect detects in the process that is incorporated into the power networks, effectively prevent the distributed power source generation island effect that is incorporated into the power networks.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind ofly prevent that distributed power source is incorporated into the power networks and produce the method for island effect that be provided with distribution network terminal at the power distribution network line end, described distribution network terminal is connected with distributed power source with distribution network respectively by feedback line; It prevents that the distributed power source method that produces island effect that is incorporated into the power networks from comprising the steps:
(a) utilize distribution network terminal to gather the be incorporated into the power networks running status amount of feeder line of distribution feeder and distributed power source;
(b) in distribution network terminal, handle, obtain distribution network and distributed power source operation conditions gathering the quantity of state of returning;
(c) according to distribution network and distributed power source operation conditions distributed power source and net state are handled.
As improvement, described step (a) specifically comprises:
(a1) change the primary side high-voltage variable that distribution feeder and distributed power source are incorporated into the power networks on the feeder line into the secondary side low-voltage by voltage transformer TV summation current transformer TA; The big electrorheological of primary side changes the little electric current of secondary side into;
(a2) in the distribution network terminal telemetry module, the little current conversion of secondary side low-voltage and secondary side is become to be fit to the analog quantity that the A/D change-over circuit is imported with TV and TA;
(a3) the A/D change-over circuit converts analog quantity to digital quantity, sends into the main process chip of distribution network terminal telemetry module.
As improvement, described step (b) specifically comprises:
(b1) calculate the data that sampling is returned in distribution network terminal, obtain parameters such as voltage, electric current, phase place;
(b2) in distribution network terminal by the distribution network sampled data being handled parameters such as the voltage obtain distribution network, electric current, frequency, harmonic wave, whether out-of-limit and analysis of harmonic judge the distribution network operation conditions according to voltage, electric current, sees faults such as phase fault, broken string, single-phase earthing whether occur; In distribution network terminal, handle parameters such as the voltage obtain distributed power source and to be incorporated into the power networks, electric current, frequency, harmonic wave by feeder line sampled data that distributed power source is incorporated into the power networks, judge the stability of the voltage of distributed power source and frequency and judge the distributed power source situation that is incorporated into the power networks, whether separate with distribution network according to voltage, electric current.
As improvement, described step (c) specifically comprises:
(c1) in distribution network terminal, the distribution network operation conditions is passed through wireless network or fibre circuit distribution of notifications formula power supply grid-connected system;
(c2) when the unusual condition interruption of power supply appears in distribution network, distribution network terminal distribution of notifications formula power supply grid-connected system separates with distribution network, prevents island effect;
(c3) find distribution network when distribution network terminal and the unusual condition interruption of power supply occurs, and when detecting the distributed power source grid-connected system and failing to separate with distribution network, then separation distributions formula power supply is incorporated into the power networks, and eliminates island effect.
The beneficial effect that the present invention is compared with prior art brought is:
Overcome the existing distributed power source problem that combining inverter side island effect detects in the process that is incorporated into the power networks, effectively prevent the distributed power source generation island effect that is incorporated into the power networks.
Description of drawings
Fig. 1 is a distribution network terminal acquisition process feeder line parameter flow process of the present invention;
Fig. 2 is that distribution network terminal of the present invention is handled the grid-connected island effect of distributed power source flow chart;
Fig. 3 is a circuit connection diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with Figure of description.
As shown in Figures 1 to 3, be provided with distribution network terminal at the power distribution network line end, described distribution network terminal is connected with distributed power source with distribution network respectively by feedback line; It prevents that the distributed power source method that produces island effect that is incorporated into the power networks from comprising the steps:
Step 1 utilizes distribution network terminal to gather the be incorporated into the power networks quantity of state of operation of feeder line of distribution feeder and distributed power source, and concrete operations are as follows:
Change the primary side high-voltage variable that distribution feeder and distributed power source are incorporated into the power networks on the feeder line into secondary side low-voltage 220V/100V by voltage transformer TV summation current transformer TA, the big electrorheological of primary side changes the little electric current 5A/1A of secondary side into, and TV and TA have played the effect of isolating and reduce amplitude;
In the distribution network terminal telemetry module, the little current conversion of secondary side low-voltage and secondary side being become to be fit to the analog quantity that the A/D change-over circuit is imported, input signal is passed through filtering with TV and TA, level translation is processed into 0~+ voltage signal of 5V, be input on the A/D converter;
The A/D change-over circuit converts analog quantity to digital quantity, sends into the main process chip of distribution network terminal telemetry module.
Because secondary side low-voltage and the little electric current of secondary side can be linked in the distribution network terminal, and need do security protection to secondary circuit, the voltage input circuit adopts the air switch of protection fast, and the electric current input circuit adopts the special test terminal.
Step 2 is handled gathering the quantity of state of returning in distribution network terminal, obtains distribution network and distributed power source operation conditions, and its concrete operations are as follows:
Main process chip on the telemetry module is according to the power quality parameter needs, determines the sampling number in the ac cycle, as 64 of ripple samplings weekly to analyze harmonic wave;
The A/D change-over circuit converts analog quantity to digital quantity, sends into the main process chip of distribution network terminal telemetry module, controls ripple sampling number weekly by main process chip simultaneously;
The data that main process chip is come sampling utilize fourier algorithm to calculate parameters such as correspondent voltage, electric current;
Sampled data can obtain the be incorporated into the power networks operational factor of feeder line of distribution feeder and distributed power source after algorithm process, comprise voltage, electric current, frequency, harmonic wave and power factor etc.
Step 3 is handled distributed power source and net state according to distribution network and distributed power source operation conditions, and its concrete operations are as follows:
In distribution network terminal by the distribution network sampled data being handled parameters such as the voltage obtain distribution network, electric current, frequency, harmonic wave; Whether out-of-limit and analysis of harmonic judge the distribution network operation conditions according to voltage, electric current, sees faults such as phase fault, broken string, single-phase earthing whether occur; In distribution network terminal, handle parameters such as the voltage obtain distributed power source and to be incorporated into the power networks, electric current, frequency, harmonic wave by feeder line sampled data that distributed power source is incorporated into the power networks, judge the voltage of distributed power source and frequency stability and judge the distributed power source situation that is incorporated into the power networks, whether separate with distribution network according to voltage, electric current.
The present invention is by detecting the be incorporated into the power networks method of operational factor of feeder line of distribution feeder and distributed power source in distribution network terminal, come the monitoring distributed power supply system to be incorporated into the power networks and produce the problem of island effect, overcome existing distributed power source and be incorporated into the power networks in the process, combining inverter side island effect detects the problem of passive type and the existence of active method.Distribution network terminal is by gathering the be incorporated into the power networks parameter of feeder line of distribution feeder and distributed power source, draw distribution network and distributed power source grid-connected system operation conditions, can detect distribution network when unusual, distribution of notifications formula power supply grid-connected system separates with distribution network, prevents island effect.Simultaneously can monitor whether success separates with distribution network the distributed power source grid-connected system by detecting the distributed power source feeder line operation conditions that is incorporated into the power networks, as not separating then distribution network terminal the distributed power source grid-connected system is separated from distribution network, eliminate island effect.

Claims (4)

1. one kind prevents that distributed power source is incorporated into the power networks and produces the method for island effect, and its spy is: be provided with distribution network terminal at the power distribution network line end, described distribution network terminal is connected with distributed power source with distribution network respectively by feedback line; It prevents that the distributed power source method that produces island effect that is incorporated into the power networks from comprising the steps:
(a) utilize distribution network terminal to gather the be incorporated into the power networks running status amount of feeder line of distribution feeder and distributed power source;
(b) in distribution network terminal, handle, obtain distribution network and distributed power source operation conditions gathering the quantity of state of returning;
(c) according to distribution network and distributed power source operation conditions distributed power source and net state are handled.
2. according to claim 1ly a kind ofly prevent that distributed power source is incorporated into the power networks and produce the method for island effect that it is characterized in that: described step (a) specifically comprises:
(a1) change the primary side high-voltage variable that distribution feeder and distributed power source are incorporated into the power networks on the feeder line into the secondary side low-voltage by voltage transformer TV summation current transformer TA; The big electrorheological of primary side changes the little electric current of secondary side into;
(a2) in the distribution network terminal telemetry module, the little current conversion of secondary side low-voltage and secondary side is become to be fit to the analog quantity that the A/D change-over circuit is imported with TV and TA;
(a3) the A/D change-over circuit converts analog quantity to digital quantity, sends into the main process chip of distribution network terminal telemetry module.
3. according to claim 1ly a kind ofly prevent that distributed power source is incorporated into the power networks and produce the method for island effect that it is characterized in that: described step (b) specifically comprises:
(b1) calculate the data that sampling is returned in distribution network terminal, obtain parameters such as voltage, electric current, phase place;
(b2) in distribution network terminal by the distribution network sampled data being handled parameters such as the voltage obtain distribution network, electric current, frequency, harmonic wave, whether out-of-limit and analysis of harmonic judge the distribution network operation conditions according to voltage, electric current, sees faults such as phase fault, broken string, single-phase earthing whether occur; In distribution network terminal, handle parameters such as the voltage obtain distributed power source and to be incorporated into the power networks, electric current, frequency, harmonic wave by feeder line sampled data that distributed power source is incorporated into the power networks, judge the stability of the voltage of distributed power source and frequency and judge the distributed power source situation that is incorporated into the power networks, whether separate with distribution network according to voltage, electric current.
4. according to claim 1ly a kind ofly prevent that distributed power source is incorporated into the power networks and produce the method for island effect that it is characterized in that: described step (c) specifically comprises:
(c1) in distribution network terminal, the distribution network operation conditions is passed through wireless network or fibre circuit distribution of notifications formula power supply grid-connected system;
(c2) when the unusual condition interruption of power supply appears in distribution network, distribution network terminal distribution of notifications formula power supply grid-connected system separates with distribution network, prevents island effect;
(c3) find distribution network when distribution network terminal and the unusual condition interruption of power supply occurs, and when detecting the distributed power source grid-connected system and failing to separate with distribution network, then separation distributions formula power supply is incorporated into the power networks, and eliminates island effect.
CN201010186684A 2010-05-21 2010-05-21 Method for preventing grid-connected island effect of distributed power source CN101834431A (en)

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
CN102044913A (en) * 2010-11-25 2011-05-04 深圳市科陆电子科技股份有限公司 Method for managing load management terminal in power distribution terminal
CN102074966A (en) * 2010-12-03 2011-05-25 深圳市科陆电子科技股份有限公司 System and method for combining distributed generation and distribution network in distribution network terminal
CN102255330A (en) * 2011-04-19 2011-11-23 河南电力试验研究院 Device and method for detecting island of micro power grid system
CN102255388A (en) * 2011-07-18 2011-11-23 航天科工深圳(集团)有限公司 Distributed distribution network terminal device
CN102270854A (en) * 2011-08-05 2011-12-07 华北电力大学 Island detecting method based on positive feedback of voltage harmonic distortion
CN102412591A (en) * 2011-08-19 2012-04-11 华北电力大学 Island detection method based on negative sequence power positive feedback
CN102684554A (en) * 2011-03-15 2012-09-19 沈阳西东控制技术有限公司 Method for detecting system transient characteristic waves for shared network control on photovoltaic micro-grid
CN103928919A (en) * 2014-05-05 2014-07-16 重庆大学 Calculation curved surface method for determining short circuit current when distribution type generators are connected to power grid
CN104321945A (en) * 2012-03-30 2015-01-28 Abb技术有限公司 Islanding detection in electricity distribution network
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
CN104682356A (en) * 2015-02-10 2015-06-03 南京能迪电气技术有限公司 Adaptive variable load anti-islanding method for distributed type photovoltaic power supply
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
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
CN108964124A (en) * 2018-07-19 2018-12-07 国网江苏省电力有限公司宿迁供电分公司 Increment power distribution network is fallen into a trap and the grid-connected Optimal Configuration Method of the distributed generation resource of Respondence to the Price of Electric Power

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CN1893214A (en) * 2005-07-05 2007-01-10 沈阳网格电子信息技术有限公司 Low-voltage photovotaic parallel-in control device
CN2927443Y (en) * 2006-03-07 2007-07-25 卢一民 Protecting control system against islet for parallel network inverse generator

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CN102044913A (en) * 2010-11-25 2011-05-04 深圳市科陆电子科技股份有限公司 Method for managing load management terminal in power distribution terminal
CN102074966A (en) * 2010-12-03 2011-05-25 深圳市科陆电子科技股份有限公司 System and method for combining distributed generation and distribution network in distribution network terminal
CN102074966B (en) * 2010-12-03 2013-12-18 深圳市科陆电子科技股份有限公司 System and method for combining distributed generation and distribution network in distribution network terminal
CN102684554A (en) * 2011-03-15 2012-09-19 沈阳西东控制技术有限公司 Method for detecting system transient characteristic waves for shared network control on photovoltaic micro-grid
CN102684554B (en) * 2011-03-15 2015-09-30 沈阳西东控制技术有限公司 A kind of system transient modelling characteristic wave detection method controlled for photovoltaic micro-grid
CN102255330A (en) * 2011-04-19 2011-11-23 河南电力试验研究院 Device and method for detecting island of micro power grid system
CN102255388A (en) * 2011-07-18 2011-11-23 航天科工深圳(集团)有限公司 Distributed distribution network terminal device
CN102255388B (en) * 2011-07-18 2013-12-18 航天科工深圳(集团)有限公司 Distributed distribution network terminal device
CN102270854A (en) * 2011-08-05 2011-12-07 华北电力大学 Island detecting method based on positive feedback of voltage harmonic distortion
CN102270854B (en) * 2011-08-05 2013-07-31 华北电力大学 Island detecting method based on positive feedback of voltage harmonic distortion
CN102412591A (en) * 2011-08-19 2012-04-11 华北电力大学 Island detection method based on negative sequence power positive feedback
CN102412591B (en) * 2011-08-19 2013-07-31 华北电力大学 Island detection method based on negative sequence power positive feedback
CN104321945B (en) * 2012-03-30 2018-01-19 Abb 技术有限公司 The method and apparatus for detecting the isolated island situation in power distribution network
CN104321945A (en) * 2012-03-30 2015-01-28 Abb技术有限公司 Islanding detection in electricity distribution network
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
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
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
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
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
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
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
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
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
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
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
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
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
CN103928919B (en) * 2014-05-05 2016-09-14 重庆大学 A kind of computing Surface Method determining that distributed power generation accesses grid short circuit electric current
CN103928919A (en) * 2014-05-05 2014-07-16 重庆大学 Calculation curved surface method for determining short circuit current when distribution type generators are connected to power 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
CN104682356B (en) * 2015-02-10 2017-11-07 南京能迪电气技术有限公司 Self-adapting changeable for distributed photovoltaic power loads anti-island method
CN104682356A (en) * 2015-02-10 2015-06-03 南京能迪电气技术有限公司 Adaptive variable load anti-islanding method for distributed type photovoltaic power supply
CN108964124A (en) * 2018-07-19 2018-12-07 国网江苏省电力有限公司宿迁供电分公司 Increment power distribution network is fallen into a trap and the grid-connected Optimal Configuration Method of the distributed generation resource of Respondence to the Price of Electric Power

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Application publication date: 20100915