CN104617579A - Harmonic suppression method in alternating-current and direct-current hybrid power transmission mode - Google Patents
Harmonic suppression method in alternating-current and direct-current hybrid power transmission mode Download PDFInfo
- Publication number
- CN104617579A CN104617579A CN201410734432.5A CN201410734432A CN104617579A CN 104617579 A CN104617579 A CN 104617579A CN 201410734432 A CN201410734432 A CN 201410734432A CN 104617579 A CN104617579 A CN 104617579A
- Authority
- CN
- China
- Prior art keywords
- filter
- current
- transformer
- winding
- power transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000001629 suppression Effects 0.000 title abstract 2
- 230000006698 induction Effects 0.000 claims abstract description 38
- 238000004804 winding Methods 0.000 claims abstract description 35
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000009466 transformation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- 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
-
- H02J3/382—
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a harmonic suppression method in an alternating-current and direct-current hybrid power transmission mode, and belongs to the technical field of power transmission and transformation. The method comprises the following steps of: SS1, injecting a direct current generated by distributed generation in a power distribution network to an alternating current network by using an alternating current system transformer neutral point to form a direct-current hybrid power transmission mode; SS2 with AC and DC power transmission system using inductive filtering transformer, the three winding transformer induction filter structure, the induction of three taps of the transformer windings structure of the filter is connected to the filter means, respectively, to provide a short circuit path for the system harmonic current; SS3 filtering parameters of the device according to the load current harmonic Wave, harmonic characteristics generated by the core magnetic saturation tuning configured such harmonics are fully compensated. The invention is applied to the sensor filter AC-DC transformer mode hybrid transmission, which can effectively shield the harmonic currents, reduce noise and loss of the transformer.
Description
Technical field
The present invention relates to the harmonic suppressing method under a kind of alternating current-direct current mixing power transmission mode, belong to T & D Technology field.
Background technology
Along with the lifting day by day that fast development and the power supply reliability of economy require, the access way of Distributed Generation in Distribution System receives increasing concern.Distributed power source huge number, comprises wind power generation, photovoltaic generation, fuel cell, tidal power generation etc., according to the character of power supply, can be divided into AC power and DC power supply two class.The connect-in strategy of AC power is relatively simple, and the synchronizing mode of DC power supply is comparatively complicated, is connected to the grid after usually through commutation inversion device DC power supply being converted into AC power again.For DC power supply, by the neutral point of its incoming transport system transformer, the transmission of electric energy can be realized by alternating current circuit, i.e. alternating current-direct current mixing transmission of electricity.
DC power supply is added in AC power by alternating current-direct current mixing power transmission mode, allows direct current and alternating current transmit simultaneously.When direct current flows through AC transformer neutral point, transformer core easily occurs saturated, forms D.C. magnetic biasing, and now appearance distorts by system power waveform, produces a large amount of harmonic wave, and transformer noise, vibration aggravation, loss increases.
Summary of the invention
For solving the problems of the technologies described above, overcoming defect and the deficiency of prior art existence, the invention provides the harmonic suppressing method under a kind of alternating current-direct current mixing power transmission mode.The present invention adopts following technical scheme: the harmonic suppressing method under a kind of alternating current-direct current mixing power transmission mode, is characterized in that, comprise the steps:
The direct current that distributed power source in power distribution network produces by SS1 injects AC network by AC system transformer neutral point, forms alternating current-direct current mixing power transmission mode;
SS2 hybrid AC/DC power transmission systems transformer adopts induction filter transformer, described induction filter transformer is three winding structure, three taps of the three winding structure of described induction filter transformer are connected with filter respectively, for system harmonics electric current provides short-channel;
The parameter of filter described in SS3 carries out tuning configuration according to the harmonic characterisitic of load current, the harmonic characterisitic of the saturated generation of iron core magnetic, and harmonic wave is it often fully compensated.
Preferably, in step SS3, the tuning layoutprocedure of the parameter of filter is as follows:
Can obtain according to Kirchhoff's law:
Wherein, U
sfor voltage source, U
lfor load voltage, I
sfor transmission line electric current, I
lfor load-side electric current, I
mfor exciting current, I
ffor the electric current in filter; Z
1, Z
2, Z
3, Z
4be respectively induction filter transformer winding equiva lent impedance, secondary winding equiva lent impedance, induction Filter Winding equiva lent impedance, filter equiva lent impedance;
Conversion is carried out to formula (1) known:
When load-side electric current I
l, exciting current I
mand supply voltage U
sone timing, I
smainly with a winding equivalent impedance Z
1, Filter Winding equivalent impedance Z
3and the equiva lent impedance Z of filter
4relevant; By adjustment induction filter transformer winding arrangement, make induction Filter Winding impedance Z
3≈ 0, induction filter produces tunning effect by the harmonic wave of characteristic frequency; As the equivalent impedance Z of filter
4during ≈ 0, now I
swith I
m, I
lirrelevant, I
mwith I
lin be divided on the branch road of filter place, thus shielding to transmission line electric current I
simpact;
Conversion is carried out to formula (1) known:
Work as Z
3+ Z
4during ≈ 0, transformer load side electric current I
lonly with load voltage U
lrelevant with winding impedance, the harmonic wave produced due to transformer magnetic saturation is almost nil on its impact.
The beneficial effect that the present invention reaches: induction filter transformer is applied to alternating current-direct current mixing power transmission mode, effectively can shields harmonic current, reduces noise and the loss of transformer.
Accompanying drawing explanation
Fig. 1 is traditional hybrid AC/DC power transmission systems circuit principle structure figure.
Fig. 2 is iron core
-i linear relationship chart.
Fig. 3 is the hybrid AC/DC power transmission systems circuit principle structure figure of application of the present invention induction filter transformer.
Fig. 4 is induction filter transformer winding switching schematic diagram of the present invention.
Fig. 5 is induction filter transformer equivalent circuit diagram of the present invention.
Fig. 6 is traditional hybrid AC/DC power transmission systems network side current waveform figure.
Fig. 7 is traditional AC/DC Power System current on line side harmonic wave distribution map.
Fig. 8 is the AC/DC Power System current waveform figure that the present invention applies induction filter transformer.
Fig. 9 is the AC/DC Power System current harmonics distribution map that the present invention applies induction filter transformer.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1 be traditional hybrid AC/DC power transmission systems circuit principle structure figure, when direct current inflow transformer winding, transformer core will occur saturated, and iron core is operated in the saturation region of magnetization curve, as Fig. 2 iron core
b point shown in-i linear relationship chart, now system will produce a large amount of harmonic wave.
As shown in Figure 3 be application of the present invention induction filter transformer hybrid AC/DC power transmission systems circuit principle structure figure, the invention provides harmonic suppressing method under a kind of alternating current-direct current mixing power transmission mode to suppress system harmonics, the direct current adopting following steps: SS1 to be produced by the distributed power source in power distribution network injects AC network by AC system transformer neutral point, forms alternating current-direct current mixing power transmission mode; SS2 hybrid AC/DC power transmission systems transformer adopts induction filter transformer, induction filter transformer is three winding structure, shown in Fig. 4 is induction filter transformer winding switching schematic diagram of the present invention, three taps of the three winding structure of induction filter transformer (a, b, c) to be connected with filter, for system harmonics electric current provides short-channel respectively; The parameter of SS3 filter carries out tuning configuration according to the harmonic characterisitic of load current, the harmonic characterisitic of the saturated generation of iron core magnetic, and harmonic wave is it often fully compensated.
Operation principle of the present invention is as follows: as shown in Figure 5 be induction filter transformer equivalent circuit diagram of the present invention, can be obtained by Kirchhoff's law:
Wherein, U
sfor voltage source, U
lfor load voltage, I
sfor transmission line electric current, I
lfor load-side electric current, I
mfor exciting current, I
ffor the electric current in filter.Z
1, Z
2, Z
3, Z
4be respectively induction filter transformer winding equiva lent impedance, secondary winding equiva lent impedance, induction Filter Winding equiva lent impedance, filter equiva lent impedance.
Conversion is carried out to formula (1) known:
When load-side electric current I
l, exciting current I
mand supply voltage U
sone timing, I
smainly with a winding equivalent impedance Z
1, Filter Winding equivalent impedance Z
3and the equiva lent impedance Z of filter
4relevant.By adjustment induction filter transformer winding arrangement, make induction Filter Winding impedance Z
3≈ 0, induction filter produces tunning effect by the harmonic wave of characteristic frequency.As the equivalent impedance Z of filter
4during ≈ 0, now I
swith I
m, I
lirrelevant, I
mwith I
lin be divided on the branch road of filter place, thus shielding to transmission line electric current I
simpact.
Conversion is carried out to formula (1) known:
Work as Z
3+ Z
4during ≈ 0, transformer load side electric current I
lonly with load voltage U
lrelevant with winding impedance, the harmonic wave produced due to transformer magnetic saturation is almost nil on its impact.
Matlab is adopted to set up simulation model, result of calculation as shown in Figures 6 to 9, shown in Fig. 6 is hybrid AC/DC power transmission systems network side current waveform figure, shown in Fig. 7 is AC/DC Power System current on line side harmonic wave distribution map, it is the AC/DC Power System current waveform figure that the present invention applies induction filter transformer shown in Fig. 8, it is the AC/DC Power System current harmonics distribution map that the present invention applies induction filter transformer shown in Fig. 9, under alternating current-direct current mixing power transmission mode, when adopting traditional transformer, because iron core magnetic is saturated, there is distortion in current on line side, obvious peaked wave is had in electric current, positive-negative half-cycle is asymmetric, containing a large amount of second harmonics, when adopting induction filter transformer, current on line side distortion degree reduces greatly.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (2)
1. the harmonic suppressing method under alternating current-direct current mixing power transmission mode, is characterized in that, comprise the steps:
The direct current that distributed power source in power distribution network produces by SS1 injects AC network by AC system transformer neutral point, forms alternating current-direct current mixing power transmission mode;
SS2 hybrid AC/DC power transmission systems transformer adopts induction filter transformer, and described induction filter transformer is three winding structure, and the three winding structure of described induction filter transformer is connected with filter, for system harmonics electric current provides short-channel;
The parameter of filter described in SS3 carries out tuning configuration according to the harmonic characterisitic of load current, the harmonic characterisitic of the saturated generation of iron core magnetic, and harmonic wave is it often fully compensated.
2. the harmonic suppressing method under a kind of alternating current-direct current mixing power transmission mode according to claim 1, it is characterized in that, in described step SS3, the tuning layoutprocedure of the parameter of filter is as follows:
Can obtain according to Kirchhoff's law:
Wherein, U
sfor voltage source, U
lfor load voltage, I
sfor transmission line electric current, I
lfor load-side electric current, I
mfor exciting current, I
ffor the electric current in filter; Z
1, Z
2, Z
3, Z
4be respectively induction filter transformer winding equiva lent impedance, secondary winding equiva lent impedance, induction Filter Winding equiva lent impedance, filter equiva lent impedance;
Conversion is carried out to formula (1) known:
When load-side electric current I
l, exciting current I
mand supply voltage U
sone timing, I
smainly with a winding equivalent impedance Z
1, Filter Winding equivalent impedance Z
3and the equiva lent impedance Z of filter
4relevant; By adjustment induction filter transformer winding arrangement, make induction Filter Winding impedance Z
3≈ 0, induction filter produces tunning effect by the harmonic wave of characteristic frequency; As the equivalent impedance Z of filter
4during ≈ 0, now I
swith I
m, I
lirrelevant, I
mwith I
lin be divided on the branch road of filter place, thus shielding to transmission line electric current I
simpact;
Conversion is carried out to formula (1) known:
Work as Z
3+ Z
4during ≈ 0, transformer load side electric current I
lonly with load voltage U
lrelevant with winding impedance, the harmonic wave produced due to transformer magnetic saturation is almost nil on its impact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410734432.5A CN104617579A (en) | 2014-12-04 | 2014-12-04 | Harmonic suppression method in alternating-current and direct-current hybrid power transmission mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410734432.5A CN104617579A (en) | 2014-12-04 | 2014-12-04 | Harmonic suppression method in alternating-current and direct-current hybrid power transmission mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104617579A true CN104617579A (en) | 2015-05-13 |
Family
ID=53151919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410734432.5A Pending CN104617579A (en) | 2014-12-04 | 2014-12-04 | Harmonic suppression method in alternating-current and direct-current hybrid power transmission mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104617579A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786588A (en) * | 2017-03-02 | 2017-05-31 | 贵州电网有限责任公司电力科学研究院 | The utility power quality control device that a kind of distributed energy is accessed |
| CN106786587A (en) * | 2017-02-14 | 2017-05-31 | 上海华虹宏力半导体制造有限公司 | The method for reducing resistance element network harmonic |
| CN108988375A (en) * | 2018-07-12 | 2018-12-11 | 南方电网科学研究院有限责任公司 | Harmonic instability analysis method considering bilateral influence |
| CN111077372A (en) * | 2019-12-24 | 2020-04-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for measuring harmonic impedance of alternating current-direct current power transmission system |
| CN112329286A (en) * | 2020-10-20 | 2021-02-05 | 中国矿业大学 | Novel induction filtering transformer structure applied to low-voltage power distribution network |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201036134Y (en) * | 2007-04-30 | 2008-03-12 | 刘福生 | Induction filtering commutator transformer |
| CN102185321A (en) * | 2011-04-15 | 2011-09-14 | 华中科技大学 | Integrated static compensator of distribution transformer |
| CN102934311A (en) * | 2010-06-01 | 2013-02-13 | Abb技术有限公司 | Interface arrangement between AC and DC systems including filter at transformer neutral point |
| CN104242307A (en) * | 2014-09-18 | 2014-12-24 | 国家电网公司 | Power transmission connecting structure |
-
2014
- 2014-12-04 CN CN201410734432.5A patent/CN104617579A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201036134Y (en) * | 2007-04-30 | 2008-03-12 | 刘福生 | Induction filtering commutator transformer |
| CN102934311A (en) * | 2010-06-01 | 2013-02-13 | Abb技术有限公司 | Interface arrangement between AC and DC systems including filter at transformer neutral point |
| CN102185321A (en) * | 2011-04-15 | 2011-09-14 | 华中科技大学 | Integrated static compensator of distribution transformer |
| CN104242307A (en) * | 2014-09-18 | 2014-12-24 | 国家电网公司 | Power transmission connecting structure |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786587A (en) * | 2017-02-14 | 2017-05-31 | 上海华虹宏力半导体制造有限公司 | The method for reducing resistance element network harmonic |
| CN106786587B (en) * | 2017-02-14 | 2019-05-03 | 上海华虹宏力半导体制造有限公司 | The method for reducing resistance element network harmonic |
| CN106786588A (en) * | 2017-03-02 | 2017-05-31 | 贵州电网有限责任公司电力科学研究院 | The utility power quality control device that a kind of distributed energy is accessed |
| CN108988375A (en) * | 2018-07-12 | 2018-12-11 | 南方电网科学研究院有限责任公司 | Harmonic instability analysis method considering bilateral influence |
| CN108988375B (en) * | 2018-07-12 | 2021-05-28 | 南方电网科学研究院有限责任公司 | Harmonic instability analysis method considering bilateral influence |
| CN111077372A (en) * | 2019-12-24 | 2020-04-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for measuring harmonic impedance of alternating current-direct current power transmission system |
| CN112329286A (en) * | 2020-10-20 | 2021-02-05 | 中国矿业大学 | Novel induction filtering transformer structure applied to low-voltage power distribution network |
| CN112329286B (en) * | 2020-10-20 | 2024-02-13 | 中国矿业大学 | Novel induction filtering transformer structure applied to low-voltage distribution network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wu et al. | A new $ LCL $-filter with in-series parallel resonant circuit for single-phase grid-tied inverter | |
| CN104617579A (en) | Harmonic suppression method in alternating-current and direct-current hybrid power transmission mode | |
| CN203800581U (en) | Transformer DC bias magnet restrain device with reverse current injection | |
| CN102290815A (en) | APF (active power filter) based on coupling inductance | |
| CN105470963A (en) | Active power filter and control method therefor | |
| Smolenski et al. | AC/DC/DC Interfaces for V2G Applications—EMC Issues | |
| Li et al. | Simulation of the electromagnetic response characteristic of an inductively filtered HVDC converter transformer using field-circuit coupling | |
| CN104113072B (en) | A kind of list returns the decision method of HVDC (High Voltage Direct Current) transmission system harmonic instability | |
| CN103138592A (en) | Improved alternative current-alternative current frequency converter system through utilization of phase-shifting transformer | |
| CN103956739A (en) | Method for achieving electric power filtering and reactive compensation of direct-current transmission converter station | |
| CN104617583B (en) | Hybrid railway power quality control system based on multifunctional balance transformer | |
| CN201878036U (en) | Inverter-type welding and cutting power supply with PFC function | |
| Wall et al. | High‐efficiency PV inverter with SiC technology | |
| CN103903840B (en) | Power transformer with magnetic bias compensating function | |
| CN104143830B (en) | A kind of double back walks abreast the decision method of HVDC (High Voltage Direct Current) transmission system harmonic instability | |
| CN103501005A (en) | Transformer induction filtering and reactive compensation integration device suitable for wind power | |
| CN203883472U (en) | Ship shore power device with novel smoothing function | |
| CN104242307B (en) | A kind of transmission of electricity attachment structure | |
| CN104092270A (en) | Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof | |
| CN103731015B (en) | Inhibit the current feedback active power filter of frequency conversion speed-adjusting system common-mode voltage | |
| CN205141696U (en) | Direct current transmission return circuit that can restrain HVDC system direct current side low order resonance | |
| CN203933483U (en) | Have the novel electric power transformer control system of D.C. magnetic biasing and no-power compensation function concurrently | |
| CN202910438U (en) | Square wave welding machine synchronization high voltage pulse pilot arc device | |
| CN203481841U (en) | Photovoltaic inverter system circuit structure based on auto transformer | |
| CN204089193U (en) | A kind of transmission of electricity syndeton |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150513 |
|
| RJ01 | Rejection of invention patent application after publication |