CN202616777U - Phase-shifting zero-sequence harmonic filter and three-phase four-wire AC power supply system - Google Patents
Phase-shifting zero-sequence harmonic filter and three-phase four-wire AC power supply system Download PDFInfo
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- CN202616777U CN202616777U CN201220179055XU CN201220179055U CN202616777U CN 202616777 U CN202616777 U CN 202616777U CN 201220179055X U CN201220179055X U CN 201220179055XU CN 201220179055 U CN201220179055 U CN 201220179055U CN 202616777 U CN202616777 U CN 202616777U
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- 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
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The embodiment of the utility model discloses a phase-shifting zero-sequence harmonic filter and a three-phase four-wire AC power supply system. The phase-shifting zero-sequence harmonic filter is connected to a power supply and a load through a three-phase four-wire power line, and comprises a zero-sequence band-pass device which is parallelly connected with the load and a zero-sequence impedor which is serially connected in the power line and corresponds to a power supply side. By adopting the technical means of cooperative operation of the zero-sequence impedor which is serially connected in the power line and corresponds to the power supply side and the zero-sequence band-pass device which is parallelly connected with the load, the phase-shifting zero-sequence harmonic filter and the three-phase four-wire AC power supply system provided by the embodiment of the utility model have the advantages of a passive filter such as simple structure and low cost, and further have the strong adaptability feature of an active filter, thereby effectively solving the third harmonic interference problem in the power grid.
Description
Technical field
The utility model relates to the harmonic technical field of electric power system mesolow distribution/low voltage electrical equipment, relates in particular to a kind of phase shift type Zero-pharse harmonic filter and three-phase four-wire system ac power supply system.
Background technology
Existing harmonic technology is divided into two kinds of passive filter and active filters.
Passive filter is the main means of the present inhibition harmonic wave that extensively adopts, and its principle is to adopt the capacitor of LC type and reactor to form resonant tank, and is tuned at certain particular harmonic frequency.The filter loop is zero in its tuned frequency place impedance in theory, thereby harmonic component that can filtering bypasses and effective this subharmonic of filtering.Passive filter is simple in structure, easy to maintenance.
Active filter utilizes controlled power semiconductor, injects and the compensation harmonic electric current that original harmonic current amplitude equates, phase place is opposite to electrical network, to offset the harmonic current that load was produced, reaches the purpose of real-Time Compensation harmonic current.Compare with above-mentioned LC mode filter, the characteristics of active filter are: 1. have adaptation function, change also compensating the multiple harmonic electric current simultaneously from the motion tracking harmonic wave; 2. when the system harmonics electric current surpassed the device compensation ability, device still can be brought into play maximum compensation ability, can not transship; It is little influenced by system impedance, can not produce resonance with system.
Because the filtering characteristic of existing passive filter is determined by the impedance ratio of system and filter, receives influence on system parameters very big, occurs phenomenons such as off resonance, overload easily, filter effect is unstable and reliability is not high; Although the compensation performance of active filter is superior to passive filter, because its circuit structure is complicated, cost is high, defectives such as power consumption is relatively large, operation and maintenance cost height apply receiving certain limitation.
The utility model content
The utility model embodiment technical problem to be solved is; A kind of passive filter advantage simple in structure, with low cost that both possessed is provided; Have the strong characteristics of active filter adaptive capacity again concurrently, the phase shift type Zero-pharse harmonic filter and the three-phase four-wire system ac power supply system of long service life.
In order to solve the problems of the technologies described above; The utility model embodiment has proposed a kind of phase shift type Zero-pharse harmonic filter; It is connected in power supply and load through three-phase and four-line formula power line, and said phase shift type Zero-pharse harmonic filter comprises: logical device of the zero sequence band parallelly connected with load and the zero sequence impedance device that is series in the said power line corresponding to mains side.
Further, the logical device of zero sequence band comprises three stem stems, and two windings are arranged on each stem stem, the equal turn numbers of said two windings and around on the contrary, two winding interconnections successively on the different stem stems.
Further, the first mutually elementary winding on first stem stem is connected in the second phase secondary winding on second stem stem; The second mutually elementary winding on second stem stem is connected in the third phase secondary winding on the 3rd stem stem; The elementary winding of third phase on the 3rd stem stem is connected in the first phase secondary winding on first stem stem.
Further, the zero sequence impedance device comprises a stem stem, and three phase windings are wrapped on the said stem stem successively.
Further, logical device of said zero sequence band and zero sequence impedance device are integrated on the transformer.
Correspondingly, the utility model embodiment also provides a kind of three-phase four-wire system ac power supply system, and said electric power system comprises: power supply, load and be connected in said power supply and said load between aforesaid phase shift type Zero-pharse harmonic filter.
The phase shift type Zero-pharse harmonic filter of the utility model embodiment and the beneficial effect of three-phase four-wire system ac power supply system are: be series in the power line technological means corresponding to the zero sequence impedance device of mains side and the zero sequence band logical device cooperating parallelly connected with load through employing; Thereby both possessed passive filter advantage simple in structure, with low cost; Have the strong characteristics of active filter adaptive capacity again concurrently, efficiently solve the third harmonic interference problem in the electrical network.
Description of drawings
Fig. 1 is the phase shift type Zero-pharse harmonic Filter Structures sketch map of the utility model embodiment.
Fig. 2 is the logical device Z of the zero sequence band among Fig. 1
LStructural representation.
Fig. 3 is the zero sequence impedance device Z among Fig. 1
0Structural representation.
Fig. 4 is the sketch map of the corresponding test circuit of the phase shift type Zero-pharse harmonic filter of the utility model embodiment.
Embodiment
Please refer to Fig. 1 ~ Fig. 3, utility model embodiment provides a kind of phase shift type Zero-pharse harmonic filter and three-phase four-wire system ac power supply system.Said electric power system comprise power supply, the load of three-phase and be connected in said power supply and said load between phase shift type Zero-pharse harmonic filter.
Phase shift type Zero-pharse harmonic filter is connected in three-phase and four-line formula power line and is connected in load through said power line, comprises that the zero sequence band parallelly connected with load leads to device Z
LWith the zero sequence impedance device Z that is series in the said power line corresponding to mains side
0, also promptly, the zero sequence band leads to device Z
LWith load parallel connection and the zero sequence impedance device Z after being connected in series connection jointly
0
The zero sequence band leads to device Z
LComprise three stem stems, two windings are arranged on each stem stem, the equal turn numbers of said two windings and around on the contrary, two winding interconnections successively on the different stem stems.Thereby the induction level in the corresponding forward and reverse magnetic field that produces equates, and is in the opposite direction, cancels each other, and stem stem also is that each magnetic flux density in mutually is zero.Particularly, the first mutually elementary winding on first stem stem is connected in the second phase secondary winding on second stem stem; The second mutually elementary winding on second stem stem is connected in the third phase secondary winding on the 3rd stem stem; The elementary winding of third phase on the 3rd stem stem is connected in the first phase secondary winding on first stem stem.As shown in Figure 2, in this execution mode, stem stem adopts iron core; Three stem stems correspond respectively to A phase, B and reach the C phase mutually; The winding of each stem stem upper end is elementary winding, and the winding of lower end is a secondary winding, and the mutually elementary winding of A on the first stem stem Ta is connected in the B phase secondary winding on the second stem stem Tb; The mutually elementary winding of B on the second stem stem Tb is connected in the C phase secondary winding on the 3rd stem stem Tc; The mutually elementary winding of C on the 3rd stem stem Tc is connected in the A phase secondary winding on the first stem stem Ta.
The zero sequence band leads to device Z
LFundamental current is presented high impedance, and zero-sequence current is rendered as Low ESR.If when having the synchronous zero-sequence current of three-phase to flow through, and amplitude equates that also the zero sequence magnetic flux will be offset fully, realization zero sequence low impedance path between power supply and load.
Concrete principle does, in three-phase four-wire system, because three-phase zero-sequence current i
A0(t), i
B0(t) and i
C0(t) identical amplitude and phase place are arranged, and the winding ratio on the same stem stem is 1:1, so the magnetic flux that elementary winding produces on each stem stem equals the magnetic flux that secondary winding produces, in the opposite direction, corresponding formula is following:
Φa(t)=-ΦA(t)；
Φb(t)=-ΦB(t)；
Φc(t)=-ΦC(t)。
Above-mentioned formula shows, if the logical device Z of the zero sequence band of flowing through
LThree-phase Zero-pharse harmonic electric current equate; The magnetic flux of a coil generation will be wound on the magnetic flux counteracting that the another one coil on the same stem stem produces; Each series connection winding just presents Low ESR like this, zero-sequence current is flow through smoothly, thereby it can be by filter filtering from system.
As shown in Figure 3, zero sequence impedance device Z
0Comprise a stem stem, three phase windings are wrapped on the said stem stem successively.Zero sequence impedance device Z
0Zero-sequence current is presented high impedance; And fundamental current is rendered as Low ESR; Be by A phase, B reach mutually C mutually this three phase winding be wrapped in same stem stem in order and constitute, the size of zero sequence impedance determines that by the magnetic conduction ability of the number of turn of twining and iron core its mutual impedance equals its self-impedance.Its effect is just led to device Z with the zero sequence band
LOn the contrary, it presents high impedance to zero-sequence current, is Low ESR to positive sequence, negative phase-sequence.So just realized that the Zero-pharse harmonic electric current that load-side produces flows between load and zero sequence filter, and do not influenced whole system.Because zero sequence impedance device Z
0Existence, also limited the zero sequence excess current that flows between system and the filter that unbalance voltage causes.In this execution mode, zero sequence impedance device Z
0With the logical device Z of zero sequence band
LBe integrated on the transformer, help simplified structure, reduce volume.
Adopt circuit shown in Figure 4 that phase shift type Zero-pharse harmonic filter is tested, experiment parameter is: system power supply line voltage is 400V, 50Hz; Phase shift type Zero-pharse harmonic filter capacity is 30KVA, and this experiment uses harmonic source to be constant-current source, and experimental result is as shown in the table:
Can see from experimental result, the phase shift type Zero-pharse harmonic filter of the utility model embodiment can be under system's unbalance condition the filtering Zero-pharse harmonic, reduce neutral current greatly, improved the quality of power supply.
Nonlinear single-phase load load inserts mutually and between the neutral line and produces Zero-pharse harmonic (mainly being third harmonic), and on the neutral line, produces stack, and the harmonic current injected system that is produced seriously distorts voltage waveform and current waveform; The most serious problem of the quality of power supply is that third harmonic disturbs in the net of city, and the phase shift type Zero-pharse harmonic filter of the utility model embodiment adopts zero sequence impedance device Z
0With the logical device Z of zero sequence band
LCombining, obtained good filter effect, is to solve effective selection that third harmonic disturbs.
The above is the embodiment of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also are regarded as the protection range of the utility model.
Claims (6)
1. a phase shift type Zero-pharse harmonic filter is characterized in that, said phase shift type Zero-pharse harmonic filter is connected in power supply and load through three-phase and four-line formula power line, and said phase shift type Zero-pharse harmonic filter comprises:
Logical device of the zero sequence band parallelly connected and the zero sequence impedance device that is series in the said power line corresponding to mains side with load.
2. phase shift type Zero-pharse harmonic filter as claimed in claim 1; It is characterized in that the logical device of zero sequence band comprises three stem stems, and two windings are arranged on each stem stem; The equal turn numbers of said two windings and around on the contrary, two winding interconnections successively on the different stem stems.
3. phase shift type Zero-pharse harmonic filter as claimed in claim 2 is characterized in that the first mutually elementary winding on first stem stem is connected in the second phase secondary winding on second stem stem; The second mutually elementary winding on second stem stem is connected in the third phase secondary winding on the 3rd stem stem; The elementary winding of third phase on the 3rd stem stem is connected in the first phase secondary winding on first stem stem.
4. phase shift type Zero-pharse harmonic filter as claimed in claim 1 is characterized in that the zero sequence impedance device comprises a stem stem, and three phase windings are wrapped on the said stem stem successively.
5. phase shift type Zero-pharse harmonic filter as claimed in claim 1 is characterized in that, logical device of said zero sequence band and zero sequence impedance device are integrated on the transformer.
6. a three-phase four-wire system ac power supply system is characterized in that, said electric power system comprises:
Power supply, load and be connected in said power supply and said load between like each described phase shift type Zero-pharse harmonic filter in the claim 1～5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220179055XU CN202616777U (en) | 2012-04-24 | 2012-04-24 | Phase-shifting zero-sequence harmonic filter and three-phase four-wire AC power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220179055XU CN202616777U (en) | 2012-04-24 | 2012-04-24 | Phase-shifting zero-sequence harmonic filter and three-phase four-wire AC power supply system |
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| CN202616777U true CN202616777U (en) | 2012-12-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340880A (en) * | 2016-11-30 | 2017-01-18 | 广东电网有限责任公司茂名供电局 | Power distribution network neutral line zero sequence harmonic suppression device with changed iron core structure |
| CN106487018A (en) * | 2016-11-30 | 2017-03-08 | 广东电网有限责任公司茂名供电局 | The power distribution network neutral conductor Zero-pharse harmonic restraining device that winding technique mode changes |
-
2012
- 2012-04-24 CN CN201220179055XU patent/CN202616777U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340880A (en) * | 2016-11-30 | 2017-01-18 | 广东电网有限责任公司茂名供电局 | Power distribution network neutral line zero sequence harmonic suppression device with changed iron core structure |
| CN106487018A (en) * | 2016-11-30 | 2017-03-08 | 广东电网有限责任公司茂名供电局 | The power distribution network neutral conductor Zero-pharse harmonic restraining device that winding technique mode changes |
| CN106340880B (en) * | 2016-11-30 | 2018-01-05 | 广东电网有限责任公司茂名供电局 | The power distribution network neutral conductor Zero-pharse harmonic restraining device that core structure changes |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Phase-shifting zero-sequence harmonic filter and three-phase four-wire AC power supply system Effective date of registration: 20161107 Granted publication date: 20121219 Pledgee: Shenzhen SME financing Company limited by guarantee Pledgor: Shenzhen Great Energy Technology Co.,Ltd. Registration number: 2016990000949 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20171212 Granted publication date: 20121219 Pledgee: Shenzhen SME financing Company limited by guarantee Pledgor: Shenzhen Great Energy Technology Co.,Ltd. Registration number: 2016990000949 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20200424 |