CN202614881U - Islanding detection device - Google Patents
Islanding detection device Download PDFInfo
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- CN202614881U CN202614881U CN 201220304778 CN201220304778U CN202614881U CN 202614881 U CN202614881 U CN 202614881U CN 201220304778 CN201220304778 CN 201220304778 CN 201220304778 U CN201220304778 U CN 201220304778U CN 202614881 U CN202614881 U CN 202614881U
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Abstract
The utility model provides an islanding detection device and belongs to the field of electric system detection. The islanding detection device solves the problem that when islanding is detected, an active detection method is adopted, harmonic wave cannot be stopped injecting in a power grid, quality of the power grid is damaged; and when a passive detection method is adopted, a large non-detection field exists, and detection time is uncertain. The islanding detection device based on wavelet analysis is used for detecting islanding of a power supply system, a power grid and a distributed grid-connected power generation system in the power supply system supply electricity to a power utilization load together, on-off states of the power grid is controlled by a first breaker, on-off states of the distributed grid-connected power generation system is controlled by a second breaker, the islanding detection device comprises a detector and an islanding detection unit, the detector detects voltage signals of a common connecting point of the power grid, the distributed grid-connected power generation system and the power utilization load, and a signal output end of the detector is connected with a signal input end of the islanding detection unit.
Description
Technical field
The utility model relates to a kind of island effect pick-up unit, belongs to the electric system detection range.
Background technology
When electrical network because of happening suddenly former thereby when breaking away from, distributed grid-connected system is failed in time to detect the disengaging of electrical network and self is cut off, and continuation and load keep the state that moves, is called island effect.Island effect has sizable harmfulness; Relevant criterion requirement according to IEEE; Distributed grid-connected system must have the island detection ability; The control strategy of island effect need detect the disengaging of electrical network apace, so that break off being connected of distributed grid-connected system and electrical network in time, harm is dropped to minimum.
At present, known island effect detection method mainly is divided into active detection and passive type detection two big classes.The active detecting method is sent disturbing signal disturbance electrical networks such as voltage, frequency, phase place or power on one's own initiative, detects the parameters such as voltage, frequency, phase place or harmonic wave of points of common connection (PCC) simultaneously, judges the isolated island situation through the variation of parameter; The passive type detection method detects parameters such as the voltage, frequency, phase place harmonic of the electrical network of points of common connection (PCC) in real time and judges island effect.But island effect commonly used is is now prevented and treated method and all can be run into the problem of some; According to active detection side's ratio juris; Any active detection method all can't can be injected harmonic wave with avoiding in electrical network; Destroy power grid quality, and general passive type detection method can exist the bigger time that can not detect territory and detection uncertain.
Summary of the invention
The utility model purpose is existing to adopt active detection method all can't understand when detecting island effect in electrical network, to inject harmonic wave in order to solve with avoiding; Destroy power grid quality; And adopt general passive type detection method can have bigger uncertain problem of the time that can not detect territory and detection, a kind of island effect pick-up unit is provided.
The said a kind of island effect pick-up unit of the utility model; This device detects the island effect of electric power system; Said electric power system comprises electrical network, distributed grid-connected system, with electric loading, first isolating switch and second road device gradually, electrical network and distributed grid-connected system are the electricity consumption electric jointly, electrical network is by the first isolating switch CS state; Distributed grid-connected system is by the second isolating switch CS state
Said island effect pick-up unit comprises detecting device and island effect detecting unit,
Detecting device detection of grid, distributed grid-connected system and with the voltage signal of electric loading three's points of common connection, the signal output part of detecting device links to each other with the signal input part of island effect detecting unit.
The advantage of the utility model: the described island effect detection technique of the utility model can not produce harmonic pollution to electrical network; Can reduce effectively to detect the generation that the territory also detects island effect accurately; What reduced the passive type detection method can not detect the territory; Can detect general passive type detection method the island effect that can't discern, and can promptly discern the characteristic of island effect, improve the detection speed that island effect is taken place significantly.
Description of drawings
Fig. 1 is the structural representation of the said island effect pick-up unit based on wavelet analysis of the utility model.
Embodiment
Embodiment one: this embodiment is described below in conjunction with Fig. 1; The said a kind of island effect pick-up unit of this embodiment; This device detects the island effect of electric power system; Said electric power system comprises electrical network 1, distributed grid-connected system 2, with electric loading 3, first isolating switch 4 and second isolating switch 5, electrical network 1 is common for supplying power with electric loading 3 with distributed grid-connected system 2, electrical network 1 is by first isolating switch, 4 CS states; Distributed grid-connected system 2 is by second isolating switch, 5 CS states
Said island effect pick-up unit comprises detecting device 6 and island effect detecting unit 7,
Detecting device 6 detection of grid 1, distributed grid-connected system 2 and with the voltage signal of electric loading 3 threes' points of common connection, the signal output part of detecting device 6 links to each other with the signal input part of island effect detecting unit 7.
The 28335 type digital signal processors that island effect detecting unit 7 adopts TI company to produce realize that island effect detecting unit 7 comprises low-pass filter circuit 7-1, quadravalence wavelet filter 7-2 and island effect decision circuitry 7-3,
The digital signal output end of the A/D convertor circuit 6-3 of detecting device 6 links to each other with the input end of low-pass filter circuit 7-1; The output terminal of low-pass filter circuit 7-1 links to each other with the input end of quadravalence wavelet filter 7-2; The quadravalence wavelet coefficient output terminal of quadravalence wavelet filter 7-2 links to each other with the input end of island effect decision circuitry 7-3, and the instruction output end of island effect decision circuitry 7-3 links to each other with the switch control end of distributed grid-connected system 2.
The island effect problem can be described to the up-down of PCC point voltage amplitude, the increase and decrease of PCC point voltage frequency, and the variation of PCC point voltage harmonic wave and saltus step of voltage-phase or the like, these all are the characteristics that is used for recognizing the island effect problem.When electrical network breaks away from; Common point PCC voltage will inevitably bring unexpected variation; This variation can be introduced a lot of high fdrequency components, and is to catch these high fdrequency components by the analysis of time domain, and the Fourier analysis method can't satisfy real-time requirement again; Therefore, this method is introduced wavelet analysis and is detected island effect through analyzing PCC place voltage signal.Island effect detection method based on wavelet analysis carries out wavelet analysis through the voltage signal that PCC is ordered, and differentiates island effect.Because when electrical network breaks away from, if need of load power and photovoltaic generating system provided does not match, the amplitude and the frequency of PCC place voltage will change this moment; Be that circuit can run on new steady state point, at new place, working point, photovoltaic generating system provides whole active power of load and reactive power; In this process, if degree of not matching is not high, general passive type detection algorithm will be malfunctioning; Because on time domain, see; Voltage or change of frequency little, but common point PCC voltage will inevitably bring unexpected variation when electrical network breaks away from, and this variation can be introduced a lot of high fdrequency components; And be to catch these high fdrequency components by the analysis of time domain, thereby wavelet analysis just can capture the generation that these information pick out island effect.
Fig. 1 is the structural representation of the utility model; Voltage signal through PCC is ordered detects in real time; The island effect detecting unit carries out the wavelet decomposition analysis to the voltage signal that the detecting device transmission comes then; When island effect takes place, thereby the generation that island effect is told in huge variation can take place down at the yardstick that we set in the wavelet coefficient that wavelet analysis obtains, and detects this device behind the result and to the control section transmission signal of distributed grid-connected system it is quit work.
The wavelet analysis of this method and device adopts the Daub4 small echo to carry out the analysis to signal; Use the quadravalence wavelet decomposition; Detecting device 6 detects the voltage of points of common connection PCC in real time, and converts voltage signal to digital signal transfers to island effect detecting unit 7 through processing of circuit, and digital voltage signal at first passes through low-pass filtering treatment; Eliminate the influence of noise to signal analysis; Then signal is carried out wavelet decomposition, selecting analysis module through scale coefficient, judge through the island effect judge module whether island effect takes place and produce to judge signal at last the conscientious analysis of signal after decomposing.
The island effect detecting unit 7 of this device is made up of digital signal processor system; Adopt TI company 28335 type digital signal processors, the function of processor mainly comprises four modules: low-pass filter circuit 7-1, quadravalence wavelet filter 7-2 and island effect decision circuitry 7-3.Three modules are coordinated to be integrated in the digital signal processing chip to realize through software.The test section is made up of Hall voltage sensor 6-1, operational amplification circuit 6-2 and A/D convertor circuit 6-3.
Claims (3)
1. island effect pick-up unit; This device detects the island effect of electric power system; Said electric power system comprises electrical network (1), distributed grid-connected system (2), with electric loading (3), first isolating switch (4) and second isolating switch (5), for supplying power with electric loading (3), electrical network (1) is by first isolating switch (4) CS state jointly for electrical network (1) and distributed grid-connected system (2); Distributed grid-connected system (2) is by second isolating switch (5) CS state
It is characterized in that said island effect pick-up unit comprises detecting device (6) and island effect detecting unit (7),
Detecting device (6) detection of grid (1), distributed grid-connected system (2) and with the voltage signal of electric loading (3) three's points of common connection, the signal output part of detecting device (6) links to each other with the signal input part of island effect detecting unit (7).
2. a kind of island effect pick-up unit according to claim 1; It is characterized in that; Detecting device (6) comprises Hall voltage sensor (6-1), operational amplification circuit (6-2) and A/D convertor circuit (6-3); Hall voltage sensor (6-1) detection of grid (1), distributed grid-connected system (2) and with the voltage signal of electric loading (3) three's points of common connection; The voltage signal output end of Hall voltage sensor (6-1) links to each other with the input end of operational amplification circuit (6-2), and the output terminal of operational amplification circuit (6-2) links to each other with the input end of analog signal of A/D convertor circuit (6-3), A/D convertor circuit (6-3) output digital signal.
3. a kind of island effect pick-up unit according to claim 2; It is characterized in that; The 28335 type digital signal processors that island effect detecting unit (7) adopts TI company to produce are realized; Island effect detecting unit (7) comprises low-pass filter circuit (7-1), quadravalence wavelet filter (7-2) and island effect decision circuitry (7-3)
The digital signal output end of the A/D convertor circuit (6-3) of detecting device (6) links to each other with the input end of low-pass filter circuit (7-1); The output terminal of low-pass filter circuit (7-1) links to each other with the input end of quadravalence wavelet filter (7-2); The quadravalence wavelet coefficient output terminal of quadravalence wavelet filter (7-2) links to each other with the input end of island effect decision circuitry (7-3), and the instruction output end of island effect decision circuitry (7-3) links to each other with the switch control end of distributed grid-connected system (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220304778 CN202614881U (en) | 2012-06-27 | 2012-06-27 | Islanding detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201220304778 CN202614881U (en) | 2012-06-27 | 2012-06-27 | Islanding detection device |
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| CN202614881U true CN202614881U (en) | 2012-12-19 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995201A (en) * | 2014-05-23 | 2014-08-20 | 国家电网公司 | Wind power generation set islanding test device |
| CN105974272A (en) * | 2016-07-26 | 2016-09-28 | 上海电气分布式能源科技有限公司 | Passive island detection 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 |
| CN103983873B (en) * | 2014-05-19 | 2017-01-11 | 国网宁夏电力公司 | Island detection method suitable for multi-inverter parallel operation and based on impedance measurement |
| CN105738730B (en) * | 2016-02-03 | 2018-05-08 | 华北电力科学研究院有限责任公司 | The island detection method and device of photovoltaic DC-to-AC converter |
| CN111579932A (en) * | 2020-05-29 | 2020-08-25 | 海宁科茂微电网技术有限公司 | Island detection method for distributed power generation system |
-
2012
- 2012-06-27 CN CN 201220304778 patent/CN202614881U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103983873B (en) * | 2014-05-19 | 2017-01-11 | 国网宁夏电力公司 | Island detection method suitable for multi-inverter parallel operation and based on impedance measurement |
| CN103995201A (en) * | 2014-05-23 | 2014-08-20 | 国家电网公司 | Wind power generation set islanding test device |
| CN103995201B (en) * | 2014-05-23 | 2017-01-11 | 国家电网公司 | Wind power generation set islanding test device |
| CN105738730B (en) * | 2016-02-03 | 2018-05-08 | 华北电力科学研究院有限责任公司 | The island detection method and device of photovoltaic DC-to-AC converter |
| CN105974272A (en) * | 2016-07-26 | 2016-09-28 | 上海电气分布式能源科技有限公司 | Passive island detection method |
| CN105974272B (en) * | 2016-07-26 | 2019-10-08 | 上海电气分布式能源科技有限公司 | A kind of passive type island detection method |
| CN111579932A (en) * | 2020-05-29 | 2020-08-25 | 海宁科茂微电网技术有限公司 | Island detection method for distributed power generation system |
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Owner name: HEILONGJIANG ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20130424 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: HEILONGJIANG ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20130424 |
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Free format text: CORRECT: ADDRESS; FROM: 150030 HARBIN, HEILONGJIANG PROVINCE TO: 100761 XICHENG, BEIJING |
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Effective date of registration: 20130424 Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Patentee after: State Grid Corporation of China Patentee after: Heilongjiang Electric Power Research Institute Address before: 150030 Xiangjiang Road, Xiangfang District, Heilongjiang, No. 7, No. Patentee before: Heilongjiang Electric Power Research Institute |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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