CN101582586A - Digital automatic harmonic elimination device - Google Patents
Digital automatic harmonic elimination device Download PDFInfo
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- CN101582586A CN101582586A CN 200810011439 CN200810011439A CN101582586A CN 101582586 A CN101582586 A CN 101582586A CN 200810011439 CN200810011439 CN 200810011439 CN 200810011439 A CN200810011439 A CN 200810011439A CN 101582586 A CN101582586 A CN 101582586A
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Abstract
The invention discloses a digital automatic harmonic elimination device which comprises a residual voltage input unit, a harmonic elimination unit, a singlechip and a display setting unit. Data collected by the residual voltage input unit collects is converted by an A/D and sent to the singlechip which calculates and obtains data larger than a fixed value given by the display setting unit and triggers a bidirectional thyristor to switch on by controlling an optocoupler; the harmonic elimination unit is switched in a PT open triangle, a voltage collecting unit for collecting the three-phase voltages of a bus is also switched in the A/D connected with a data interface of the singlechip which calculates the data collected by the voltage collecting unit, obtains a residual voltage by and compares the residual voltage with a residual voltage obtained by the open triangle; single-phase grounding occurs if a difference value is smaller than the setting value, and power frequency resonance occurs if the difference value is larger than or equal to the setting value. The invention can accurately distinguish the defaults, such as the power frequency resonance, the single-phase grounding, and the like, accurately eliminates the system resonance in time and has the functions of over-voltage protection, low-voltage protection and PT break judgment.
Description
Technical field
The invention belongs to power distribution network control resist technology field, a kind of high reliability digital automatic harmonic elimination device with overvoltage protection and under-voltage protection particularly is provided.
Background technology
Neutral point in China, in the low voltage power distribution network is normally earth-free.In order to monitor insulation, be connected to the electromagnetic potential transformer of band open delta on the bus of power plant, electric substation usually.The three-phase degree of saturation of electromagnetic potential transformer is in a basic balance during normal operation, and the electromagnetic potential transformer equivalent inductance much larger than line mutual-ground capacitor so can not form resonant tank, at this moment, the displacement voltage of neutral point is very little.But after some handover operation or earth fault disappearance, electromagnetic potential transformer three-phase degree of saturation difference is very big, it and line mutual-ground capacitor form special single-phase or three-phase resonant tank, cause that bigger displacement voltage appears in neutral point, in system, excited the overvoltage of the higher magnitude that continues, Here it is ferro-resonance over-voltage.Protective tube owing to the secondary side loop in system might be burnt when overvoltage, or on high-tension side air switch is because at this moment superpotential influence tripping for protection can cause a certain voltage between phases of low-pressure side to reduce and the generation low-voltage.
Operating experience shows, the ferro-resonance over-voltage that generation electromagnetic potential transformer core sataration causes in the electric power system is the most common and maximum a kind of internal overvoltage that causes the accident in the isolated neutral system, the resonance overvoltage of planting ferro resonance thus and producing, the safe operation of serious harm insulation of electrical installation and electric power system, can cause the blast of voltage transformer when serious, cause a serious accident, must eliminate as early as possible.
In order to eliminate the ferro resonance in the electric power system, traditional solution is at voltage transformer open delta two ends and connects a resistance or bulb absorbs resonant energy.Because resonance is with the different frequency composition, though can eliminate partial resonance sometimes, in most cases unsatisfactory, must rely on drawing voltage transformer or cut-out load, eliminate ferro resonance to change system structure parameter, waste time and energy and interrupt the user and power.Adopt machine controllable silicon to eliminate the device of resonance although also occurred some at present, this device just carries out resonance by the residual voltage of gathering bus PT open delta and differentiates, and eliminate resonance by the control controllable silicon, when the residual voltage of 50Hz appears in open delta, these harmonic elimination apparatus are merely able to come failure judgement by comparing residual voltage with a threshold value of device internal preset, judgement sensitivity to grounding through resistance is not high, and the fault of resistance grounded may be judged as industrial frequency resonance by mistake.
Summary of the invention
The object of the present invention is to provide a kind of can the correct decision industrial frequency resonance and the high reliability digital automatic harmonic elimination device of single phase ground fault.
Another object of the present invention is to provide a kind of to be had overvoltage protection, under-voltage protection and PT broken string simultaneously and differentiates and prevent that electric weight from losing the high reliability digital automatic harmonic elimination device of function.
The object of the present invention is achieved like this, a kind of digital automatic harmonic elimination device comprises residual voltage input unit, harmonic elimination unit, single-chip microcomputer and the demonstration unit of adjusting, the harmonic elimination unit mainly is composed in series by high-power harmonic elimination resistance and bidirectional triode thyristor, control end at bidirectional triode thyristor adopts the zero cross fired optocoupler to control, and the control end of optocoupler is connected to the control delivery outlet of single-chip microcomputer; The data that the residual voltage input unit collects are sent into single-chip microcomputer after changing through A/D, single-chip microcomputer through the data that calculate greater than the demonstration given definite value in unit of adjusting, single-chip microcomputer then triggers the bidirectional triode thyristor conducting by the control optocoupler, the harmonic elimination unit is inserted the PT open delta, it is characterized in that: with also insert the voltage acquisition unit of gathering the bus three-phase voltage on the A/D converter that the data port of single-chip microcomputer is connected.
In order to realize the phylogenetic fault of correct decision industrial frequency resonance and single phase ground fault, a kind of digital automatic harmonic elimination device of the present invention, its single-chip microcomputer carries out three-phase voltage phasor and calculating by the data to the voltage acquisition unit collection, compare calculating the residual voltage that residual voltage and open delta collect, if differ less than the demonstration given definite value in unit of adjusting, be the generation single-phase earthing, if differ by more than or equal to show that the given definite value in unit of adjusting is the generation industrial frequency resonance.
Differentiate in order to realize that overvoltage protection, under-voltage protection and PT break, a kind of digital automatic harmonic elimination device of the present invention, its residual voltage input unit and voltage acquisition unit are formed by several voltage transformers.Single-chip microcomputer is gathered the three-phase voltage of bus in real time by voltage transformer, go out three line voltages by the phase voltage calculation that collects, this line voltage and the liquid crystal display definite value that the unit sets of adjusting compares, when being higher than superpotential setting value, arbitrary line voltage promptly sends the overvoltage alarm signal, the setting value that all is lower than low-voltage when three line voltages promptly sends the low-voltage alarm signal, and PT broken string alarm signal takes place when any line voltage is lower than setting value.
The present invention can accurately distinguish faults such as industrial frequency resonance and single-phase earthing owing to increased voltage acquisition unit, promptly and accurately eliminates system resonance, has overvoltage protection, under-voltage protection and PT broken string simultaneously and differentiates and prevent that electric weight from losing.
Description of drawings
Fig. 1 is the schematic diagram of digital automatic harmonic elimination device of the present invention.
Embodiment
As shown in Figure 1, a kind of digital automatic harmonic elimination device of the present invention comprises residual voltage input unit 5, harmonic elimination unit 4, single-chip microcomputer 2 and the demonstration unit 3 of adjusting, harmonic elimination unit 4 mainly is composed in series by high-power harmonic elimination resistance and bidirectional triode thyristor, control end at bidirectional triode thyristor adopts the zero cross fired optocoupler to control, the control end of optocoupler is connected to the control delivery outlet of single-chip microcomputer, the data that residual voltage input unit 5 collects are sent into single-chip microcomputer after changing through A/D, single-chip microcomputer through the data that calculate greater than the demonstration given definite value in unit of adjusting, single-chip microcomputer then triggers the bidirectional triode thyristor conducting by the control optocoupler, the harmonic elimination unit is inserted the PT open delta, it is characterized in that: with also insert the voltage acquisition unit 1 of gathering the bus three-phase voltage on the A/D converter that the data port of single-chip microcomputer is connected.
As shown in Figure 1, residual voltage input unit 5 and voltage acquisition unit 1 are formed by voltage transformer, and model is DIS-PT200/3.53.Harmonic elimination unit 4 by the optocoupler MOC3061 with zero cross fired conducting, great power bidirectional controllable silicon BT136, piezo-resistance MYG681K, filter inductance MISKH, etc. element form.Single-chip microcomputer 2 adopts technical grade high reliability single-chip microcomputer MR32173.Show that the unit 3 of adjusting is made up of very color liquid crystal of large color screen TFT and keyboard.
As shown in Figure 1, a kind of digital automatic harmonic elimination device of the present invention, its single-chip microcomputer 2 carries out three-phase voltage phasor and calculating by the data that voltage acquisition unit 1 is gathered, compare calculating the residual voltage that residual voltage and open delta collect, if differ less than the demonstration given definite value in unit 3 of adjusting, be the generation single-phase earthing, if differ by more than or equal to show that the given definite value in unit of adjusting is the generation industrial frequency resonance.Insert the bus three-phase voltage by voltage acquisition unit 1, three-phase voltage is pressed the three-phase four-wire system connection at the PT secondary side.Show that the given definite value in unit of adjusting is 5～10V.
As shown in Figure 1, a kind of digital automatic harmonic elimination device of the present invention, its single-chip microcomputer is gathered the three-phase voltage of bus in real time by voltage acquisition unit 1, go out three line voltages by the phase voltage calculation that collects, this line voltage compares with showing the definite value that the unit of adjusting is set, when being higher than superpotential setting value, arbitrary line voltage promptly sends the overvoltage alarm signal, the setting value that all is lower than low-voltage when three line voltages promptly sends the low-voltage alarm signal, and PT broken string alarm signal takes place when any line voltage is lower than setting value.Show that the overvoltage setting value that the unit of adjusting is set is 90～130V, the low-voltage setting value is 50～70V, and PT broken string setting value is 10～70V.
As shown in Figure 1, a kind of digital automatic harmonic elimination device of the present invention, its single-chip microcomputer is gathered the residual voltage of open delta in real time by residual voltage input unit 5, single-chip microcomputer is by calculating three frequency division, two divided-frequency, power frequency, secondary, three effective values to nine each harmonics that contain in the residual voltage, is sent to through the RS485 communication interface to show that the unit of adjusting shows.
Claims (4)
1, a kind of digital automatic harmonic elimination device, comprise residual voltage input unit (5), harmonic elimination unit (4), single-chip microcomputer (2) and the demonstration unit (3) of adjusting, harmonic elimination unit (4) mainly is composed in series by high-power harmonic elimination resistance and bidirectional triode thyristor, control end at bidirectional triode thyristor adopts the zero cross fired optocoupler to control, and the control end of optocoupler is connected to the control delivery outlet of single-chip microcomputer; The data that residual voltage input unit (5) collects are sent into single-chip microcomputer after changing through A/D, single-chip microcomputer through the data that calculate greater than the demonstration given definite value in unit of adjusting, single-chip microcomputer then triggers the bidirectional triode thyristor conducting by the control optocoupler, the harmonic elimination unit is inserted the PT open delta, it is characterized in that: with also insert the voltage acquisition unit (1) of gathering the bus three-phase voltage on the A/D converter that the data port of single-chip microcomputer is connected.
2, according to the described a kind of digital automatic harmonic elimination device of claim 1, it is characterized in that: single-chip microcomputer (2) carries out three-phase voltage phasor and calculating by the data that voltage acquisition unit (1) is gathered, compare calculating the residual voltage that residual voltage and open delta collect, if differ less than the demonstration given definite value in unit of adjusting, be the generation single-phase earthing, if differ by more than or equal to show that the given definite value in unit of adjusting is the generation industrial frequency resonance.
3, according to the described a kind of digital automatic harmonic elimination device of claim 1, it is characterized in that: single-chip microcomputer is gathered the three-phase voltage of bus in real time by voltage acquisition unit (1), go out three line voltages by the phase voltage calculation that collects, this line voltage compares with showing the definite value that the unit of adjusting is set, when being higher than superpotential setting value, arbitrary line voltage promptly sends the overvoltage alarm signal, the setting value that all is lower than low-voltage when three line voltages promptly sends the low-voltage alarm signal, and PT broken string alarm signal takes place when any line voltage is lower than setting value.
4, according to the described a kind of digital automatic harmonic elimination device of claim 1, it is characterized in that: single-chip microcomputer is gathered the residual voltage of open delta in real time by residual voltage input unit (5), single-chip microcomputer passes through to calculate the effective value of each harmonic in the residual voltage, is sent to through the RS485 communication interface to show that the unit of adjusting shows.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810011439 CN101582586A (en) | 2008-05-14 | 2008-05-14 | Digital automatic harmonic elimination device |
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| CN 200810011439 CN101582586A (en) | 2008-05-14 | 2008-05-14 | Digital automatic harmonic elimination device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199514A (en) * | 2013-02-25 | 2013-07-10 | 重庆大学 | Method of eliminating ferromagnetic resonances |
| CN104049558A (en) * | 2014-05-30 | 2014-09-17 | 安徽三和电力技术有限公司 | Novel microcomputer controller |
| CN104377676A (en) * | 2014-10-31 | 2015-02-25 | 国家电网公司 | PT intelligent resonance elimination device for power distribution network |
| CN104600688A (en) * | 2015-02-17 | 2015-05-06 | 安徽巨森电器有限公司 | Overvoltage suppression comprehensive device with GPRS (general packet radio service) wireless communication function |
| CN106328361A (en) * | 2016-08-30 | 2017-01-11 | 合肥智博电气有限公司 | Resonation elimination mechanism used in arc-resonation elimination device |
| CN106908649A (en) * | 2017-03-14 | 2017-06-30 | 南京保合太和电力科技有限公司 | Generator power pick-up device voltage sample system and method |
| CN106992779A (en) * | 2015-09-23 | 2017-07-28 | 赛灵思公司 | The IP blocks of distribution network |
| CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
| CN110146780A (en) * | 2019-04-24 | 2019-08-20 | 国网江苏省电力有限公司电力科学研究院 | Isolated neutral flexibility distribution network system ferromagnetic resonance method of discrimination |
| CN112485595A (en) * | 2020-11-30 | 2021-03-12 | 云南电网有限责任公司电力科学研究院 | Power distribution network ground fault line selection protection method and device |
-
2008
- 2008-05-14 CN CN 200810011439 patent/CN101582586A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199514B (en) * | 2013-02-25 | 2015-04-22 | 重庆大学 | Method of eliminating ferromagnetic resonances |
| CN103199514A (en) * | 2013-02-25 | 2013-07-10 | 重庆大学 | Method of eliminating ferromagnetic resonances |
| CN104049558A (en) * | 2014-05-30 | 2014-09-17 | 安徽三和电力技术有限公司 | Novel microcomputer controller |
| CN104377676A (en) * | 2014-10-31 | 2015-02-25 | 国家电网公司 | PT intelligent resonance elimination device for power distribution network |
| CN104600688A (en) * | 2015-02-17 | 2015-05-06 | 安徽巨森电器有限公司 | Overvoltage suppression comprehensive device with GPRS (general packet radio service) wireless communication function |
| CN106992779B (en) * | 2015-09-23 | 2021-08-13 | 赛灵思公司 | IP block of power distribution network |
| CN106992779A (en) * | 2015-09-23 | 2017-07-28 | 赛灵思公司 | The IP blocks of distribution network |
| CN106328361A (en) * | 2016-08-30 | 2017-01-11 | 合肥智博电气有限公司 | Resonation elimination mechanism used in arc-resonation elimination device |
| CN106908649A (en) * | 2017-03-14 | 2017-06-30 | 南京保合太和电力科技有限公司 | Generator power pick-up device voltage sample system and method |
| CN108767815A (en) * | 2018-07-17 | 2018-11-06 | 云南电网有限责任公司红河供电局 | Electromagnetic potential transformer auto by pass harmonic elimination apparatus |
| CN108767815B (en) * | 2018-07-17 | 2024-02-02 | 云南电网有限责任公司红河供电局 | Automatic bypass resonance elimination device of electromagnetic voltage transformer |
| CN110146780A (en) * | 2019-04-24 | 2019-08-20 | 国网江苏省电力有限公司电力科学研究院 | Isolated neutral flexibility distribution network system ferromagnetic resonance method of discrimination |
| CN110146780B (en) * | 2019-04-24 | 2021-06-08 | 国网江苏省电力有限公司电力科学研究院 | Ferromagnetic resonance distinguishing method for neutral point ungrounded flexible power distribution network system |
| CN112485595A (en) * | 2020-11-30 | 2021-03-12 | 云南电网有限责任公司电力科学研究院 | Power distribution network ground fault line selection protection method and device |
| CN112485595B (en) * | 2020-11-30 | 2024-04-09 | 云南电网有限责任公司电力科学研究院 | Power distribution network ground fault line selection protection method and device |
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Open date: 20091118 |