CN109962478A - A kind of low-pass filtering device - Google Patents
A kind of low-pass filtering device Download PDFInfo
- Publication number
- CN109962478A CN109962478A CN201910205403.2A CN201910205403A CN109962478A CN 109962478 A CN109962478 A CN 109962478A CN 201910205403 A CN201910205403 A CN 201910205403A CN 109962478 A CN109962478 A CN 109962478A
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- China
- Prior art keywords
- reactor
- low
- pass filtering
- capacitor
- input terminal
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a kind of low-pass filtering devices, including input terminal, capacitor, output terminal, metal shell, the first reactor, the second reactor and third reactor；Output terminal is located at the side of metal shell, and input terminal is connected by conducting wire secondary circuit is connected to current transformer；Capacitor and the first reactor, the second reactor, third reactor are constituted low-pass filtering circuit in series-parallel mode；Output terminal is located at the other side of metal shell, is connected with receiving module by conducting wire.The present apparatus filters out higher harmonic current by hardware mode by the filtering performance of low-pass filter, influence of the Eliminate highter harmonic electric current to sampling, it is ensured that protection sampling is not influenced by higher harmonic current；The size of fundamental current is not had an impact, it is ensured that the precision of sampling.
Description
Technical field
The present invention relates to high-voltage flexible AC transmission system technical fields, more particularly to one kind to be used for tandem type flexible AC
The low-pass filtering device of transmission system sampling circuit.
Background technique
With the development of economy, electric load constantly increases, and to the conveying capacity of power grid, more stringent requirements are proposed.Especially
It is that demand to electric power system tide control, voltage control and short circuit current control is more and more, therefore flexible AC transmission
(Flexible AC Transmission Systems, FACTS) device in the power system using more and more.
FACTS can be divided into tandem arrangement, shunting means and series-parallel connection device according to the mode connecting with power grid.
The tandem type flexible AC transmission equipment applied at present includes: series compensation device and series resonance-type fault current
Limits device, schematic diagram are as shown in Figure 1.In figure, 31 be the bus of transmission line of electricity side；36 be the mother of the transmission line of electricity other side
Line, 32 be the line switching of transmission line of electricity side；35 be the line switching of the transmission line of electricity other side, and 33 be transmission line of electricity, and 34 are
The tandem type device installed.In the line due to device series connection, therefore the insulation of its insulating requirements and line-to-ground over the ground is wanted
It asks consistent, to reduce project cost, tandem arrangement is mounted on the insulated platform of steel construction, insulated platform is again by post insulator
Son, oblique pull insulator are fixed.Therefore electrical link is just not present in tandem arrangement and ground, insulating requirements are by support insulator and oblique pull
Insulator meets, and device only needs to consider the insulating requirements to insulated platform, greatly reduce the insulation of tandem arrangement itself
It is horizontal.
In the line in view of the series connection of tandem type flexible AC transmission equipment, it to ensure that main equipment operates normally, needs to match
Overvoltage protective device is set, also needs to configure corresponding second protection for these main equipment, and then need to acquire insulation flat
Corresponding electrical quantity on platform, and these electrical quantity are passed to the protective device on ground, logic judgment is carried out as protective device
Foundation.
For series compensation device, matched second protection includes capacitance unbalance protection, and domestic a certain series connection is mended
It repays device and capacitance unbalance protection movement has occurred in the operational process after perimeter systems increase direct current, SVG, so that string
Connection compensation device exits.When consequent malfunction is analyzed, do not find that the capacitor unit of series compensation device has abnormal phenomenon,
But capacitor unbalance electric current power frequency component very little is found when to analysis, and there is very big content in higher hamonic wave.Due to
Algorithm used by the secondary control protective device that the series compensation device is matched is root mean square algorithm, quicker to higher hamonic wave
Sense, therefore cause protection misoperation.It, can not be by upgrading software in view of the producer is at home without after-sale technical support
Influence of the Eliminate highter harmonic electric current to protection, and the filter used in the power system in the past is usually to believe voltage
It number is filtered.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned the deficiencies in the prior art, a kind of low-pass filtering device is provided.
The present invention is achieved through the following technical solutions: a kind of low-pass filtering device, including input terminal, capacitor,
Output terminal, metal shell, the first reactor, the second reactor and third reactor；The input terminal is located at the metal
The side of shell, the input terminal is connected by conducting wire secondary circuit has the electric current for acquiring the primary circuit magnitude of current mutual
Sensor；The output terminal is located at the other side of the metal shell, is connected with receiving module by conducting wire；First reactance
Device one end connects with side input terminal, and the other end connects with one end of second reactor, second reactor
The other end connects with the output terminal of the side；The capacitor is respectively connected to other side input terminal by conducting wire and the other side exports
Terminal, the capacitor are connect with one end of the third reactor, the other end access of the third reactor first electricity
On anti-device and the second reactor connecting line；The capacitor and first reactor, the second reactor, third reactor
Constitute low-pass filtering circuit.
First reactor constitutes the first branch, and the second reactor constitutes second branch, and third reactor is connected in series to the capacitor structure
At third branch, reactor and capacitor constitute series-parallel system and constitute low-pass filtering circuit.
The low-pass filtering circuit uses the low-pass network of elliptic function, cutoff frequency 400Hz.
The low-pass filtering circuit is using in series system access sampling circuit.Low-pass filtering circuit is connect using series system
Enter, higher harmonic current can be filtered out.
The current transformer uses straight-through current transformer.
It is compared with the prior art, the present invention has the advantages that filtering performance of the present apparatus by low-pass filter, is eliminated high
Influence of the subharmonic current to sampling, the current sampling circuit suitable for electric system；It is humorous that high order is filtered out by hardware mode
Wave electric current, it is ensured that protection sampling is not influenced by higher harmonic current；The size of fundamental current is not had an impact, it is ensured that adopt
The precision of sample.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that existing tandem type flexible AC transmission equipment accesses electric system；
Fig. 2 is the structural schematic diagram of low-pass filter of the present invention；
Fig. 3 is the structural schematic diagram that low-pass filter of the present invention accesses in sampling circuit.
Appended drawing reference meaning in figure: 1, low-pass filter；11, the first reactor；12, the second reactor；13, third reactance
Device；14, capacitor；15, input terminal；16, output terminal；17, metal shell；21, first capacitor device group of branches；22, the second electricity
Container group of branches；23, the first straight-through current transformer；24, the second straight-through current transformer；25, sampling apparatus；31, defeated
The bus of electric line side；32, the line switching of transmission line of electricity side；33, transmission line of electricity；34, the tandem type device installed；
35, the line switching of the transmission line of electricity other side；36, the bus of the transmission line of electricity other side.
Specific embodiment
The contents of the present invention are described in further details with reference to the accompanying drawings and detailed description.
Embodiment
It is a kind of low-pass filtering device, including input terminal 15, capacitor 14, output terminal 16, metal shell referring to Fig. 2
17, the first reactor 11, the second reactor 12 and third reactor 13；Input terminal 15 is located at the side of metal shell 17, defeated
Enter terminal 15 to be connected the current transformer having for acquiring the primary circuit magnitude of current by conducting wire secondary circuit；Output terminal 16
Positioned at the other side of metal shell 17, receiving module is connected with by conducting wire；First reactor, 11 one end and side input terminal
15 connect, and the other end connects with one end of the second reactor 12, the other end of the second reactor 12 and the output terminal of the side
16 connect；Capacitor 14 is respectively connected to other side input terminal 15 and other side output terminal 16, capacitor 14 and third by conducting wire
One end of reactor 13 is coupled in series, and the other end of third reactor 13 accesses the first reactor 11 and the second reactor
On 12 connecting lines；Capacitor 14 is constituted with the first reactor 11, the second reactor 12, third reactor 13 in series-parallel mode
Low-pass filtering circuit.
First reactor 11 constitutes the first branch, and the second reactor 12 constitutes second branch, third reactor 13 and capacitor
14 third branches in series, reactor and capacitor 14 constitute series-parallel system and constitute low-pass filtering circuit.
Low-pass filtering circuit uses the low-pass network of elliptic function, cutoff frequency 400Hz.
Low-pass filtering circuit is using in series system access sampling circuit.Low-pass filtering circuit is accessed using series system,
Higher harmonic current can be filtered out.
The current transformer uses straight-through current transformer.
In the present embodiment, receiving module is existing general technology, does not do deployment analysis.
Refering to Fig. 3, in use, the series connection of low-pass filter 1 is connected to the first straight-through current transformer 23, the second punching
The secondary terminals of current transformer 24, formation that first capacitor device group of branches 21 is connected with the first straight-through current transformer 23
Second capacitor group of branches 22 is connected with the second straight-through current transformer 24 and forms the second branch, the first branch by one branch
It is in parallel with the second branch；The other end of low-pass filter 1 is connected on the sampling circuit of sampling apparatus 25.When 14 device of capacitor is uneven
When there are higher harmonic components in weighing apparatus electric current, higher harmonic current can be filtered out by the low-pass filter 1.This application example
The cutoff frequency of middle selection is 400Hz, can meet the filtering requirements of higher harmonic current in this example.If having to cutoff frequency
Other are required, and can be realized by reactor, the capacitor 14 of modification filter circuit.
The device that this device provides, can effectively filter out the higher harmonic current component generated in capacitor group, it is ensured that protect
The preparation of sampling is protected, so that series compensation device keeps operating normally.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment is not to limit this hair
Bright the scope of the patents, all equivalence enforcements or change without departing from carried out by the present invention, is intended to be limited solely by the scope of the patents of this case.
Claims (4)
1. a kind of low-pass filtering device, it is characterised in that: including input terminal, capacitor, output terminal, metal shell, the first electricity
Anti- device, the second reactor and third reactor；The input terminal is located at the side of the metal shell, and the input terminal is logical
Conducting wire secondary circuit is crossed to be connected the current transformer having for acquiring the primary circuit magnitude of current；The output terminal is located at described
The other side of metal shell is connected with receiving module by conducting wire；First reactor one end connects with side input terminal,
Its other end connects with one end of second reactor, the other end and the output terminal phase of the side of second reactor
It connects；The capacitor is respectively connected to other side input terminal and other side output terminal, the capacitor and the third by conducting wire
One end of reactor connects, and the other end of the third reactor accesses first reactor and connect with second reactor
On line；The capacitor and first reactor, the second reactor, third reactor constitute low-pass filtering circuit.
2. low-pass filtering device according to claim 1, it is characterised in that: the low-pass filtering circuit uses elliptic function
Low-pass network, cutoff frequency 400Hz.
3. low-pass filtering device according to claim 1, it is characterised in that: the low-pass filtering circuit uses series system
It accesses in sampling circuit.
4. low-pass filtering device according to claim 1, it is characterised in that: the current transformer uses centre path current
Mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910205403.2A CN109962478A (en) | 2019-03-18 | 2019-03-18 | A kind of low-pass filtering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910205403.2A CN109962478A (en) | 2019-03-18 | 2019-03-18 | A kind of low-pass filtering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109962478A true CN109962478A (en) | 2019-07-02 |
Family
ID=67024346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910205403.2A Pending CN109962478A (en) | 2019-03-18 | 2019-03-18 | A kind of low-pass filtering device |
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| CN (1) | CN109962478A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111447727A (en) * | 2020-04-01 | 2020-07-24 | 南京国电南自维美德自动化有限公司 | Secondary circuit anti-interference circuit board device |
-
2019
- 2019-03-18 CN CN201910205403.2A patent/CN109962478A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111447727A (en) * | 2020-04-01 | 2020-07-24 | 南京国电南自维美德自动化有限公司 | Secondary circuit anti-interference circuit board device |
| CN111447727B (en) * | 2020-04-01 | 2021-04-27 | 南京国电南自维美德自动化有限公司 | Secondary circuit anti-interference circuit board device |
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| PB01 | Publication | ||
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| TA01 | Transfer of patent application right |
Effective date of registration: 20211105 Address after: 533000 Baise Bureau of UHV company, No. 69 Yinglong Road, Youjiang District, Baise City, Guangxi Zhuang Autonomous Region (next to Zhuzhou bridge) Applicant after: CSG EHV TRANSMISSION COMPANY BOSE BUREAU Address before: 533000 Baise Bureau of UHV company, No. 69 Yinglong Road, Youjiang District, Baise City, Guangxi Zhuang Autonomous Region (next to Zhuzhou bridge) Applicant before: CSG EHV TRANSMISSION COMPANY BOSE BUREAU Applicant before: NR ENGINEERING Co.,Ltd. |