CN102778634B - Distribution network voltage fluctuation positioning method and device - Google Patents
Distribution network voltage fluctuation positioning method and device Download PDFInfo
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- CN102778634B CN102778634B CN201210239509.2A CN201210239509A CN102778634B CN 102778634 B CN102778634 B CN 102778634B CN 201210239509 A CN201210239509 A CN 201210239509A CN 102778634 B CN102778634 B CN 102778634B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Measuring Phase Differences (AREA)
Abstract
The invention discloses a distribution network voltage fluctuation positioning method and a distribution network voltage fluctuation positioning device. A voltage fluctuation generating direction positioning algorithm is adopted, and the voltage fluctuation direction indicator variable is calculated from voltage and current waveform sampling values of the head end of the distribution network circuit, wherein the direction indicator variable fx is +1, 0 or -1; when fx is equal to +1, the voltage fluctuation comes from the lower part of the circuit; when fx is equal to -1, the voltage fluctuation comes from the upper part of the circuit; and when fx is equal to 0, effective information of voltage fluctuation positioning cannot be obtained. According to the distribution network voltage fluctuation positioning device and the distribution network voltage fluctuation positioning method, the voltage fluctuation source direction can be judged according to the voltage and current waveform sampling values of the head end of the distribution network circuit, the fluctuation types are indicated, and the voltage fluctuation generating position is deduced according to directional signals of all the monitoring points.
Description
Technical field
The present invention relates to a kind of voltage fluctuation localization method, particularly a kind of distribution voltage fluctuation localization method and locating device.
Background technology
Along with the deep development of electricity market, power quality problem more and more receives Utilities Electric Co. and user's concern.In numerous electrical energy power quality disturbances, distribution voltage fluctuation be incidence higher, cause damage one of distribution network electric energy quality problem more serious.Can accurately monitor distribution voltage wave phenomenon at present, for analysis disturbing cause, assessment disturbance harm provide substantially first section.But detect merely voltage characteristic amount and can not determine voltage fluctuation interference source, cannot determine which bar circuit voltage fluctuation source is positioned at, and this just causes electric network fault accurately to locate, and cannot overhaul in time and definite responsibility.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, and a kind of distribution voltage fluctuation localization method that can accurately locate distribution voltage fluctuation source is provided.
The present invention is also to provide a kind of distribution voltage fluctuation locating device that can accurately locate distribution voltage fluctuation source.
A distribution voltage fluctuation localization method, is characterized in that: (1) obtains voltage, current waveform sampled value from distribution line head end, constructing virtual three-phase values, and it is specially, and establish line voltage waveform and meet function suc as formula shown in (1),
When three-phase voltage is symmetrical, have
Thereby can be from residue two phase signals b (t) and the c (t) of single voltage or current signal a (t) constructing virtual,
(2) get respectively each phase voltage, electric current structure three-phase composite signal, obtain following 6 groups of combinations: { u
a(t), u
b-a(t), u
c-a(t) }, { u
a-b(t), u
b(t), u
c-b(t) }, { u
a-c(t), u
b-c(t), u
c(t) }, { i
a(t), i
b-a(t), i
c-a(t) }, { i
a-b(t), i
b(t), i
c-b(t) }, { i
a-c(t), i
b-c(t), i
c(t) }, add original three-phase signal { u
a(t), u
b(t), u
c(t) }, { i
a(t), i
b(t), i
c(t) }, totally 8 groups of three-phase electric quantity signals carry out xy0 coordinate conversion;
(3), in each sampling instant, from 8 groups of three-phase electric quantity signals, by formula (4) to (6), calculate respectively 8 phasors
wherein N is every cycle sampling number, and k is sampled point sequence number,
Represent one of 8 groups of three-phase electric quantity signals,
(4) calculating of voltage fluctuation direction signal fx: calculate 8 phasors
after, respectively to each phasor
note
as △ D (k) >0.1U
b, meter is just changing 1 time, during and if only if continuous counter 3 times, and output waveform judgment variable lt=1; As △ D (k) <-0.1U
b, the negative change of meter 1 time, during and if only if continuous counter 3 times, output waveform judgment variable lt=-1.Thereby calculate 8 signal waveform judgment variable lt
1to lt
8.Number corresponding electric quantity signal type as follows: 1 actual three-phase voltage signal, the three-phase virtual voltage signal that 2A phase voltage generates, the three-phase virtual voltage signal that 3B phase voltage generates, the three-phase virtual voltage signal that 4C phase voltage generates, the three-phase virtual current signal that the three-phase virtual current signal 8C phase current that the three-phase virtual current signal 7B phase current that 5 actual three-phase current signal 6A phase currents generate generates generates.
It is positive dirction that the electric current of take during calculated direction signal fx flows into circuit, and fx=1 represents that voltage fluctuation is positioned at circuit positive dirction, and fx=-1 represents that voltage fluctuation is positioned at circuit in the other direction, and fx=0 represents not monitor obvious voltage fluctuation.Direction signal fx=-lt
1* lt
5.
(5) judgement of voltage fluctuation position: and if only if when there is fx=1 circuit both sides, and judgement voltage fluctuation occurs on this circuit.
(6) calculating of voltage fluctuation type signal lx: Rule of judgment is lt when lx is 1
1≠ 0, lt
1=1: illustrate that three-phase voltage rises sharply, lt
1=-1: three-phase voltage rapid drawdown is described; When lx is 2, Rule of judgment is lt
1=lt
3=lt
4=0, lt
2≠ 0, lt
2=1:A phase voltage rises sharply, lt
2the rapid drawdown of=-1:A phase voltage; When lx is 3, Rule of judgment is lt
1=lt
2=lt
4=0, lt
3≠ 0, lt
3=1:A phase voltage rises sharply, lt
3the rapid drawdown of=-1:A phase voltage; When lx is 4, Rule of judgment is lt
1=lt
2=lt
3=0, lt
4≠ 0, lt
4=1:A phase voltage rises sharply, lt
4the rapid drawdown of=-1:A phase voltage.
A kind of distribution voltage fluctuation locating device, its structural feature is: comprise filtering and signal acquisition module, with 1. virtual three-phase electricity signal configuration algorithm, 2. wave form varies evaluation algorithm, 3. the calculating of direction signal fx and type signal lx, 4. the dsp processor of distribution voltage fluctuation type and location algorithm function, with system parameter setting, system equipment monitoring running state, and realize man-machine interaction, the arm processor of report upload function, ethernet communication module, display device, described filtering and signal acquisition module are based on digital signal processing unit, filtering and signal acquisition module are connected to obtain voltage from distribution line head end with distribution line head end, current waveform sampled value, the output terminal of filtering and signal acquisition module is connected with dsp processor, dsp processor output terminal is connected with arm processor, arm processor is connected with ethernet communication module and display device respectively, ethernet communication module realizes uploading of system data.
Filtering and signal acquisition module are based on digital signal processing unit, to realize the high speed acquisition of online 12 channel voltages, current signal, the main algorithm of dsp processor completion system, arm processor is mainly responsible for the functions such as system management, demonstration, communication, comprise system parameter setting, system equipment monitoring running state, and realize man-machine interaction, report upload.
In sum, the present invention's following advantage compared to existing technology:
Distribution voltage fluctuation localization method of the present invention and locating device, can be from distribution line head end voltage, current waveform sampled value judgement voltage fluctuation source direction, point out the type of fluctuation, and according to the generation position of the direction signal derivation voltage fluctuation of whole monitoring points.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of distribution voltage fluctuation localization method of the present invention.
Fig. 2 is the theory diagram of distribution voltage fluctuation locating device of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in more detail.
Embodiment 1
A kind of distribution voltage fluctuation localization method as shown in Figure 1, (1) a kind of distribution voltage fluctuation localization method, it is characterized in that: (1) obtains voltage, current waveform sampled value from distribution line head end, constructing virtual three-phase values, it is specially, if line voltage waveform meets function suc as formula shown in (1)
When three-phase voltage is symmetrical, have
Thereby can be from single voltage or current signal u
a(t) the residue two phase signals u of constructing virtual
b-aand u (t)
c-a(t),
(2) get respectively each phase voltage, electric current structure three-phase composite signal, obtain following 6 groups of combinations: { u
a(t), u
b-a(t), u
c-a(t) }, { u
a-b(t), u
b(t), u
c-b(t) }, { u
a-c(t), u
b-c(t), u
c(t) }, { i
a(t), i
b-a(t), i
c-a(t) }, { i
a-b(t), i
b(t), i
c-b(t) }, { i
a-c(t), i
b-c(t), i
c(t) }, add original three-phase signal { u
a(t), u
b(t), u
c(t) }, { i
a(t), i
b(t), i
c(t) }, totally 8 groups of three-phase electric quantity signals carry out xy0 coordinate conversion;
(3), in each sampling instant, from 8 groups of three-phase electric quantity signals, by formula (4) to (6), calculate respectively 8 phasors
wherein N is every cycle sampling number, and k is sampled point sequence number,
Represent one of 8 groups of three-phase electric quantity signals,
(4) calculating of voltage fluctuation direction signal fx: calculate 8 phasors
after, respectively to each phasor
note
as △ D (k) >0.1U
b, meter is just changing 1 time, during and if only if continuous counter 3 times, and output waveform judgment variable lt=1; As △ D (k) <-0.1U
b, the negative change of meter 1 time, during and if only if continuous counter 3 times, output waveform judgment variable lt=-1, thereby calculate 8 signal waveform judgment variable lt
1to lt
8number corresponding electric quantity signal type as follows: 1 actual three-phase voltage signal, the three-phase virtual voltage signal that 2A phase voltage generates, the three-phase virtual voltage signal that 3B phase voltage generates, the three-phase virtual voltage signal that 4C phase voltage generates, the three-phase virtual current signal that the three-phase virtual current signal 8C phase current that the three-phase virtual current signal 7B phase current that 5 actual three-phase current signal 6A phase currents generate generates generates
It is positive dirction that the electric current of take during calculated direction signal fx flows into circuit, and fx=1 represents that voltage fluctuation is positioned at circuit positive dirction, and fx=-1 represents that voltage fluctuation is positioned at circuit in the other direction, and fx=0 represents not monitor obvious voltage fluctuation, direction signal fx=-lt
1* lt
5;
(5) judgement of voltage fluctuation position: and if only if when there is fx=1 circuit both sides, and judgement voltage fluctuation occurs on this circuit;
(6) calculating of voltage fluctuation type signal lx: Rule of judgment is lt when lx is 1
1≠ 0, lt
1=1: illustrate that three-phase voltage rises sharply, lt
1=-1: three-phase voltage rapid drawdown is described; When lx is 2, Rule of judgment is lt
1=lt
3=lt
4=0, lt
2≠ 0, lt
2=1:A phase voltage rises sharply, lt
2the rapid drawdown of=-1:A phase voltage; When lx is 3, Rule of judgment is lt
1=lt
2=lt
4=0, lt
3≠ 0, lt
3=1:A phase voltage rises sharply, lt
3the rapid drawdown of=-1:A phase voltage; When lx is 4, Rule of judgment is lt
1=lt
2=lt
3=0, lt
4≠ 0, lt
4=1:A phase voltage rises sharply, lt
4the rapid drawdown of=-1:A phase voltage.
It is same as the prior art that the present embodiment is not stated part.
Embodiment 2
A kind of distribution voltage fluctuation locating device, comprise filtering and signal acquisition module, with 1. virtual three-phase electricity signal configuration algorithm, 2. wave form varies evaluation algorithm, 3. the calculating of direction signal fx and type signal lx, 4. the dsp processor of distribution voltage fluctuation type and location algorithm function, with system parameter setting, system equipment monitoring running state, and realize man-machine interaction, the arm processor of report upload function, ethernet communication module, display device, described filtering and signal acquisition module are based on digital signal processing unit, filtering and signal acquisition module are connected to obtain voltage from distribution line head end with distribution line head end, current waveform sampled value, the output terminal of filtering and signal acquisition module is connected with dsp processor, dsp processor output terminal is connected with arm processor, arm processor is connected with ethernet communication module and display device respectively, ethernet communication module realizes uploading of system data.
It is identical with embodiment 1 that the present embodiment is not stated part.
Claims (1)
1. a distribution voltage fluctuation localization method, is characterized in that: (1) obtains voltage, current waveform sampled value from distribution line head end, constructing virtual three-phase values, and it is specially, and establish line voltage waveform and meet function suc as formula shown in (1),
When three-phase voltage is symmetrical, have
Thereby can be from residue two phase signals b (t) and the c (t) of single voltage or current signal a (t) constructing virtual,
(2) get respectively each phase voltage, electric current structure three-phase composite signal, obtain following 6 groups of combinations: { u
a(t), u
b-a(t), u
c-a(t) }, { u
a-b(t), u
b(t), u
c-b(t) }, { u
a-c(t), u
b-c(t), u
c(t) }, { i
a(t), i
b-a(t), i
c-a(t) }, { i
a-b(t), i
b(t), i
c-b(t) }, { i
a-c(t), i
b-c(t), i
c(t) }, add original three-phase signal { u
a(t), u
b(t), u
c(t) }, { i
a(t), i
b(t), i
c(t) }, totally 8 groups of three-phase electric quantity signals carry out xy0 coordinate conversion;
(3), in each sampling instant, from 8 groups of three-phase electric quantity signals, by formula (4) to (6), calculate respectively 8 phasors
wherein N is every cycle sampling number, and k is sampled point sequence number,
represent one of 8 groups of three-phase electric quantity signals,
(4) calculating of voltage fluctuation direction signal fx: calculate 8 phasors
after, respectively to each phasor
note
as Δ D (k) > 0.1U
b, meter is just changing 1 time, during and if only if continuous counter 3 times, and output waveform judgment variable 1t=1; As Δ D (k) <-0.1U
b, the negative change of meter 1 time, during and if only if continuous counter 3 times, output waveform judgment variable 1t=-1, thereby calculate 8 signal waveform judgment variable 1t
1to 1t
8number corresponding electric quantity signal type as follows: 1 actual three-phase voltage signal, the three-phase virtual voltage signal that 2A phase voltage generates, the three-phase virtual voltage signal that 3B phase voltage generates, the three-phase virtual voltage signal that 4C phase voltage generates, the three-phase virtual current signal that the three-phase virtual current signal 8C phase current that the three-phase virtual current signal 7B phase current that 5 actual three-phase current signal 6A phase currents generate generates generates
It is positive dirction that the electric current of take during calculated direction signal fx flows into circuit, and fx=1 represents that voltage fluctuation is positioned at circuit positive dirction, and fx=-1 represents that voltage fluctuation is positioned at circuit in the other direction, and fx=0 represents not monitor obvious voltage fluctuation, direction signal fx=-1t
1* 1t
5;
(5) judgement of voltage fluctuation position: and if only if when there is fx=1 circuit both sides, and judgement voltage fluctuation occurs on this circuit;
(6) calculating of voltage fluctuation type signal 1x: Rule of judgment is 1t when 1x is 1
1≠ 0,1t
1=1: illustrate that three-phase voltage rises sharply, 1t
1=-1: three-phase voltage rapid drawdown is described; When 1x is 2, Rule of judgment is 1t
1=1t
3=1t
4=0,1t
2≠ 0,1t
2=1:A phase voltage rises sharply, 1t
2the rapid drawdown of=-1:A phase voltage; When 1x is 3, Rule of judgment is 1t
1=1t
2=1t
4=0,1t
3≠ 0,1t
3=1:A phase voltage rises sharply, 1t
3the rapid drawdown of=-1:A phase voltage; When 1x is 4, Rule of judgment is 1t
1=1t
2=1t
3=0,1t
4≠ 0,1t
4=1:A phase voltage rises sharply, 1t
4the rapid drawdown of=-1:A phase voltage.
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CN102778634B (en) * | 2012-07-11 | 2014-12-10 | 福建省电力有限公司电力科学研究院 | Distribution network voltage fluctuation positioning method and device |
CN104698417B (en) * | 2015-03-16 | 2017-12-19 | 国网山西省电力公司电力科学研究院 | A kind of analog input formula flicker tester discriminating method |
CN107907752B (en) * | 2017-09-22 | 2020-01-24 | 国网上海市电力公司 | Method for positioning regional direct current ground potential fluctuation source |
CN108919048A (en) * | 2018-05-23 | 2018-11-30 | 安徽国电京润电力科技有限公司 | A kind of voltage ripple of power network positioning system and localization method |
CN108693443A (en) * | 2018-05-23 | 2018-10-23 | 安徽国电京润电力科技有限公司 | A kind of distribution network voltage fluctuation precise positioning system and localization method |
CN113783750B (en) * | 2021-08-25 | 2023-05-26 | 南方电网数字平台科技(广东)有限公司 | Method and device for detecting fluctuation abnormality of power grid index |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101241163A (en) * | 2008-03-21 | 2008-08-13 | 华北电力大学 | Flicker source recognition method |
CN201440158U (en) * | 2009-07-21 | 2010-04-21 | 黑龙江大学 | Power quality monitoring and analyzing device |
CN202794432U (en) * | 2012-07-11 | 2013-03-13 | 福建省电力有限公司电力科学研究院 | Distribution network voltage fluctuation positioning device |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5050622B2 (en) * | 2007-04-17 | 2012-10-17 | 富士電機株式会社 | Voltage fluctuation compensator control method |
US7916643B2 (en) * | 2007-11-09 | 2011-03-29 | International Business Machines Corporation | Limiting extreme loads at session servers |
CN201196659Y (en) * | 2008-03-21 | 2009-02-18 | 浙江师范大学 | Portable electric power quality monitoring instrument |
CN201218822Y (en) * | 2008-07-01 | 2009-04-08 | 乐山一拉得电网自动化有限公司 | Electric energy quality on-line monitoring device |
JP5219203B2 (en) * | 2008-10-08 | 2013-06-26 | 関西電力株式会社 | Cable fault point measuring method and cable fault point measuring instrument |
CN101515015B (en) * | 2009-03-06 | 2010-12-08 | 深圳市双合电气股份有限公司 | Power quality monitoring and recording device of power system |
CN102269779A (en) * | 2011-06-22 | 2011-12-07 | 哈尔滨电工仪表研究所 | Voltage fluctuation recording device based on DLMS (distribution line message specification)/COSEM (companion specification for energy metering) |
CN102778634B (en) * | 2012-07-11 | 2014-12-10 | 福建省电力有限公司电力科学研究院 | Distribution network voltage fluctuation positioning method and device |
-
2012
- 2012-07-11 CN CN201210239509.2A patent/CN102778634B/en active Active
-
2013
- 2013-06-03 WO PCT/CN2013/076644 patent/WO2014008792A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101241163A (en) * | 2008-03-21 | 2008-08-13 | 华北电力大学 | Flicker source recognition method |
CN201440158U (en) * | 2009-07-21 | 2010-04-21 | 黑龙江大学 | Power quality monitoring and analyzing device |
CN202794432U (en) * | 2012-07-11 | 2013-03-13 | 福建省电力有限公司电力科学研究院 | Distribution network voltage fluctuation positioning device |
Non-Patent Citations (12)
Title |
---|
A.M.Dan.Identification of Flicker Sources.《Harmonics and Quality of Power Proceedings》.1998,第2卷第1179-1181页. * |
Fourier transform,wavelets,Prony analysis:tools for harmonics and quality of power;Michel MEUNIER 等;《Harmonics and Quality of Power Proceedings》;19981231;第1卷;第71-76页 * |
Identification of Flicker Sources;A.M.Dan;《Harmonics and Quality of Power Proceedings》;19981231;第2卷;第1179-1181页 * |
JP特开2008-271633A 2008.11.06 * |
Michel MEUNIER 等.Fourier transform,wavelets,Prony analysis:tools for harmonics and quality of power.《Harmonics and Quality of Power Proceedings》.1998,第1卷第71-76页. * |
一种基于小波变换的电能质量特征量提取及分类的方法;吴晓朝 等;《控制理论与应用》;20080430;第25卷(第2期);第325-328页 * |
中华人民共和国国家质量监督检验检疫总局.电能质量 电压波动和闪变.《中华人民共和国国家标准GB/T12326-2008》.2008,全文. * |
吴晓朝 等.一种基于小波变换的电能质量特征量提取及分类的方法.《控制理论与应用》.2008,第25卷(第2期),第325-328页. * |
基于小波变换和Prony算法的振荡瞬变和电压波动检测;林静 等;《华中电力》;20081231;第21卷(第6期);第1-5页以及第10页 * |
堵俊 等.多支路负荷闪变源识别研究.《电力***保护与控制》.2008,第36卷(第24期),第58-61页. * |
多支路负荷闪变源识别研究;堵俊 等;《电力***保护与控制》;20081216;第36卷(第24期);第58-61页 * |
林静 等.基于小波变换和Prony算法的振荡瞬变和电压波动检测.《华中电力》.2008,第21卷(第6期),第1-5页以及第10页. * |
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