CN105403770A - Power transmission line main harmonic source direction indicating instrument - Google Patents
Power transmission line main harmonic source direction indicating instrument Download PDFInfo
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- CN105403770A CN105403770A CN201510756599.6A CN201510756599A CN105403770A CN 105403770 A CN105403770 A CN 105403770A CN 201510756599 A CN201510756599 A CN 201510756599A CN 105403770 A CN105403770 A CN 105403770A
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Abstract
The invention provides a power transmission line main harmonic source direction indicating instrument, and relates to the technical field of electric power system harmonic analysis. The power transmission line main harmonic source direction indicating instrument comprises a host machine which is used for measuring harmonic active power and reactive power of the power supply side of a power transmission line and an auxiliary machine which is used for measuring harmonic active power and reactive power of the user side of the power transmission line. The host machine and the auxiliary machine are connected via data communication. The power transmission line main harmonic source direction indicating instrument has a real-time online power transmission line main harmonic source direction indicating function. The main harmonic source direction is determined according to a total of four power values of harmonic active power and reactive power of the two ends of the power transmission line so that the result is accurate and the existing technical defects are overcome.
Description
Technical field
The present invention relates to harmonic analysis in power system technical field.
Background technology
Along with science and technology and the fast development of national economy, a large amount of nonlinear load and generation of electricity by new energy equipment access electrical network, the quality of power supply situation of electric system is more and more severeer, this wherein, harmonic pollution is one of distinct issues the most.
For this reason, electric system has adopted the modern means such as Harmonic Detecting Device, harmonic treating apparatus to improve the quality of power supply more and more, but harmonic source is accurately located and remained an international difficult problem.Inaccurate location harmonic source---liability for polution just can not correctly divide, and inaccurate location harmonic source---resolution is just difficult to shoot the arrow at the target.
Determine in power engineering that the most frequently used method of main harmonic source is ' harmonic wave active power direction method ', WilsunXu in 2003
,with famous paper " AnInvestigationontheValidityofPower-DirectionMethodforHa the rmonicSourceDetermination " (IEEETRANSACTIONSONPOWERDELIVERY of XianLiu at them, VOL.18, NO.1, JANUARY2003) in demonstrate: harmonic wave active power direction can not represent the direction of main harmonic source.
Because harmonic wave active power can not represent the direction of main harmonic source, the present invention proposes a kind of power transmission line main harmonic source direction indicator, is specifically designed to the direction of the online power transmission line of instruction in real time main harmonic.Traditional harmonic wave active power direction method is only by the harmonic wave active power determination main harmonic source direction of points of common connection (PCC), power transmission line main harmonic source direction indicator according to power transmission line two ends harmonic wave active power and reactive power---totally 4 performance number determination main harmonic source directions, power transmission line main harmonic source direction indicator is very useful undoubtedly to the frequency analysis of electric system.
Summary of the invention
The present invention proposes a kind of power transmission line main harmonic source direction indicator that can overcome prior art defect.
The present invention includes a main frame for the diligent power of harmonic wave of measuring power transmission line supply side and reactive power and one subsidiary engine for the diligent power of harmonic wave and reactive power of measuring power transmission line user side, connected by data communication between main and auxiliaries.
Described main frame comprises supply side voltage transformer (VT), supply side current transformer, supply side analog-to-digital conversion module, supply side harmonic power measurement module, supply side harmonic wave equiva lent impedance measurement module, harmonic propagation direction discernment module, harmonic direction indicator and the first data interface module; The analog voltage of power transmission line supply side and analog current are connected to the input end of supply side analog-to-digital conversion module respectively by supply side voltage transformer (VT) and supply side current transformer; An output terminal of supply side analog-to-digital conversion module is connected to an input end of supply side harmonic propagation direction discernment module by the harmonic wave equiva lent impedance measurement module of supply side; Supply side harmonic power measurement module one end connects supply side analog-to-digital conversion module, the other end is by signal input part, described first data interface module and the harmonic propagation direction discernment model calling of harmonic propagation direction discernment model calling at harmonic direction indicator.
Described subsidiary engine comprises user side voltage transformer (VT), user side current transformer, user side analog-to-digital conversion module, user-side harmonic power measurement module, user-side harmonic equiva lent impedance measurement module and the second data interface module; The analog voltage of power transmission line user side and analog current are connected to the input end of user side analog-to-digital conversion module respectively by user side voltage transformer (VT) and user side current transformer; An output terminal of user side analog-to-digital conversion module is connected with the second data interface module by the harmonic wave equiva lent impedance measurement module of user side; User-side harmonic power measurement module one end connects user side analog-to-digital conversion module, and the other end is connected with the second data interface module; Connected by data communication between described second data interface module and the first data interface module.
Main frame of the present invention is for measuring the diligent power of harmonic wave and the reactive power of power transmission line supply side (i.e. near-end), subsidiary engine then for measuring the diligent power of harmonic wave and the reactive power of power transmission line user side (i.e. far-end), can adopt wireless (GPRS) or Ethernet to carry out data communication between main and auxiliaries.
The input signal of main frame is the analog voltage of near-end
u 1and analog current
i 1,
u 1with
i 1respectively through voltage transformer (VT)
pT1 summation current transformer
cT1 input end delivering to analog-to-digital conversion module ADC1, simulating signal is converted into digital signal by ADC1.Harmonic power measurement module HPQ1 is delivered in the output of ADC1, HPQ1 utilizes digital voltage signal and digital current signal to calculate each harmonic active power and the reactive power of near-end, harmonic propagation direction discernment module HDI is delivered in the output of HPQ1, and each harmonic equiva lent impedance that also has simultaneously delivering to harmonic propagation direction discernment module HDI is measured.
The input signal of subsidiary engine is the analog voltage of far-end
u 2and analog current
i 2,
u 2with
i 2respectively through voltage transformer (VT)
pT2 summation current transformers
cT2 input ends delivering to analog-to-digital conversion module ADC2, analog voltage signal is converted into digital signal by ADC2.Harmonic power measurement module HPQ2 is delivered in the output of ADC2, HPQ2 utilizes digital voltage signal and digital current signal to calculate each harmonic active power and the reactive power of far-end, data communication module CM2 is delivered in the output of HPQ2, and each harmonic active power of far-end, harmonic wave reactive power and harmonic wave equiva lent impedance are delivered to the data communication module CM1 of main frame by CM2.
The harmonic propagation direction discernment module HDI of main frame of the present invention presses ad hoc approach identification harmonic propagation direction according to each harmonic active power of each harmonic active power of near-end and reactive power, far-end and reactive power, near-end each harmonic equiva lent impedance, far-end each harmonic equiva lent impedance, and harmonic propagation direction is shown in real time by harmonic direction indicator.Harmonic propagation direction discernment module HDI identifies that the method for harmonic direction is as follows:
Proximally to supply side see be one active (
hsubharmonic source) singly-terminal pair, if its
hsubharmonic equiva lent impedance is
, proximally see to user side be also one active (
hsubharmonic source) singly-terminal pair, if its
hsubharmonic equiva lent impedance is
.
Distally to supply side see be one active (
hsubharmonic source) singly-terminal pair, if its
hsubharmonic equiva lent impedance is
, proximally see to user side be also one active (
hsubharmonic source) singly-terminal pair, if its
hsubharmonic equiva lent impedance is
.
These harmonic impedance values can precalculate out by the conventional method of electric system---and store in memory, also can be obtained by on-line identification (concrete grammar can see relevant technical literature, and this place does not repeat again).
If near-end records
hsubharmonic power is
, far-end records
hsubharmonic power is
, calculate main harmonic source direction index.
Harmonic propagation direction discernment module HDI arrives according to proximal measurement
hsubharmonic active power (
) and
hsubharmonic reactive power (
), far-end measuring arrives
hsubharmonic active power (
) and
hsubharmonic reactive power (
) calculate
hsubharmonic direction index
d h , method is:
,
Wherein,
one group of coefficient,
Circuit ultimate principle is used to prove: if
d h >0 then
hsecondary main harmonic source is positioned at supply side, if
d h <0 then
hsecondary main harmonic source is positioned at user side, if
d h =0 supply side and user side
hsubharmonic source difficulty point primary and secondary.Harmonic direction indicator is according to direction index
d h symbol instruction main harmonic source direction.
The outstanding advantages of the present invention's difference and existing like product:
1, existing like product only possesses Detecting Power Harmonics and off-line analysis function, do not possess real-time online power transmission line main harmonic source direction function, in other words, existing like product does not possess main harmonic source direction function, and the present invention has filled up this functional blank.
2, existing like product is only by the harmonic wave active power determination main harmonic source direction of points of common connection (PCC), correct result cannot be obtained, the present invention is according to the harmonic wave active power at power transmission line two ends and reactive power---totally four performance number determination main harmonic source directions, and result accurately and overcome prior art defect.
Accompanying drawing explanation
Fig. 1 is the scheme of installation of the present invention in electric system.
Fig. 2 is the structural representation of main frame of the present invention.
Fig. 3 is the structural representation of subsidiary engine of the present invention.
Embodiment
As shown in Figure 1, TV is the voltage transformer (VT) of system in the installation site of the present invention in electric system, and TA is the current transformer of system.Harmonic direction indicator comprises a main frame 1 and a subsidiary engine 2, main frame 1 measures the diligent power of harmonic wave and the reactive power of power transmission line " near-end ", subsidiary engine 2 measures the diligent power of harmonic wave and the reactive power of power transmission line " far-end ", carries out data communication between main frame 1 and subsidiary engine 2." near-end " is exactly power transmission line one end near supply side, and " far-end " is exactly power transmission line one end near user side.
As shown in Figure 2, main frame comprises supply side voltage transformer (VT) 11, supply side current transformer 12, supply side analog-to-digital conversion module 13, supply side harmonic power measurement module 14, supply side harmonic wave equiva lent impedance measurement module 15, harmonic propagation direction discernment module 16, harmonic direction indicator 17 and the first data interface module 18.The analog voltage of power transmission line supply side and analog current are connected to the input end of supply side analog-to-digital conversion module 13 respectively by supply side voltage transformer (VT) 11 and supply side current transformer 12; An output terminal of supply side analog-to-digital conversion module 13 is connected to an input end of supply side harmonic propagation direction discernment module 16 by the harmonic wave equiva lent impedance measurement module 15 of supply side; Supply side harmonic power measurement module 14 one end connects supply side analog-to-digital conversion module 13, and the other end is connected to the signal input part of harmonic direction indicator 17 by harmonic propagation direction discernment module 16.First data interface module 18 is connected with harmonic propagation direction discernment module 16.
As shown in Figure 3, subsidiary engine comprises user side voltage transformer (VT) 21, user side current transformer 22, user side analog-to-digital conversion module 23, user-side harmonic power measurement module 24, user-side harmonic equiva lent impedance measurement module 25 and the second data interface module 26.The analog voltage of power transmission line user side and analog current are connected to the input end of user side analog-to-digital conversion module 23 respectively by user side voltage transformer (VT) 21 and user side current transformer 22; An output terminal of user side analog-to-digital conversion module 23 is connected with the second data interface module 26 by the harmonic wave equiva lent impedance measurement module 25 of user side; User-side harmonic power measurement module 24 one end connects user side analog-to-digital conversion module 23, and the other end is connected with the second data interface module 26.
Main frame 1 and subsidiary engine 2 have voltage transformer (VT)
pT, current transformer
cT, analog-to-digital conversion module ADC, harmonic power measurement module HPQ, PT, CT can select minisize electromagnetic voltage, current transformer, and ADC can select 16 analog to digital converters, and HPQ can select 32 bit DSPs (digital signal processor) to realize.
The harmonic propagation direction discernment module HDI of main frame can be realized by 32 bit DSPs, and the data communication between main frame 1 and subsidiary engine 2 can be wireless (GPRS) also can be Ethernet.Harmonic direction indicator can be LCD display also can be two pilot lamp.
Claims (4)
1. a power transmission line main harmonic source direction indicator, it is characterized in that comprising a main frame for the diligent power of harmonic wave of measuring power transmission line supply side and reactive power and one subsidiary engine for the diligent power of harmonic wave and reactive power of measuring power transmission line user side, connected by data communication between main and auxiliaries.
2. power transmission line main harmonic source direction indicator according to claim 1, is characterized in that described main frame comprises supply side voltage transformer (VT), supply side current transformer, supply side analog-to-digital conversion module, supply side harmonic power measurement module, supply side harmonic wave equiva lent impedance measurement module, harmonic propagation direction discernment module, harmonic direction indicator and the first data interface module; The analog voltage of power transmission line supply side and analog current are connected to the input end of supply side analog-to-digital conversion module respectively by supply side voltage transformer (VT) and supply side current transformer; An output terminal of supply side analog-to-digital conversion module is connected to an input end of supply side harmonic propagation direction discernment module by the harmonic wave equiva lent impedance measurement module of supply side; Supply side harmonic power measurement module one end connects supply side analog-to-digital conversion module, the other end is by signal input part, described first data interface module and the harmonic propagation direction discernment model calling of harmonic propagation direction discernment model calling at harmonic direction indicator.
3. power transmission line main harmonic source direction indicator according to claim 2, is characterized in that described subsidiary engine comprises user side voltage transformer (VT), user side current transformer, user side analog-to-digital conversion module, user-side harmonic power measurement module, user-side harmonic equiva lent impedance measurement module and the second data interface module; The analog voltage of power transmission line user side and analog current are connected to the input end of user side analog-to-digital conversion module respectively by user side voltage transformer (VT) and user side current transformer; An output terminal of user side analog-to-digital conversion module is connected with the second data interface module by the harmonic wave equiva lent impedance measurement module of user side; User-side harmonic power measurement module one end connects user side analog-to-digital conversion module, and the other end is connected with the second data interface module; Connected by data communication between described second data interface module and the first data interface module.
4. power transmission line main harmonic source direction indicator according to claim 3, is characterized in that main frame is according to near-end
hsubharmonic active power
and reactive power
, far-end
hsubharmonic active power
and reactive power
calculate
hsubharmonic direction index
d h ,
;
Wherein
；
If
d h >0, then
hsecondary main harmonic source is at supply side;
If
d h <0, then
hsecondary main harmonic source is in user side;
If
d h =0, then supply side and user side
hsubharmonic source difficulty point primary and secondary.
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Cited By (4)
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| CN108169585A (en) * | 2017-11-28 | 2018-06-15 | 国电南瑞科技股份有限公司 | One kind prejudges other division of responsibiltiy engineering method based on harmonic source |
| CN108279363A (en) * | 2018-01-26 | 2018-07-13 | 四川大学 | Method and device is determined based on the main harmonic source for improving active power direction method |
| CN109066681A (en) * | 2018-09-05 | 2018-12-21 | 上海赛璞乐电力科技有限公司 | A kind of harmonic source location method and device of more feed-in AC/DC Power Systems |
| CN112014680A (en) * | 2020-07-13 | 2020-12-01 | 南方电网科学研究院有限责任公司 | Harmonic source positioning method and system for electric power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109066681A (en) * | 2018-09-05 | 2018-12-21 | 上海赛璞乐电力科技有限公司 | A kind of harmonic source location method and device of more feed-in AC/DC Power Systems |
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| CN112014680A (en) * | 2020-07-13 | 2020-12-01 | 南方电网科学研究院有限责任公司 | Harmonic source positioning method and system for electric power system |
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