CN101656144B - Device for inhibiting harmonic amplification on third winding side of ultrahigh voltage transformer - Google Patents
Device for inhibiting harmonic amplification on third winding side of ultrahigh voltage transformer Download PDFInfo
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- CN101656144B CN101656144B CN2009101682524A CN200910168252A CN101656144B CN 101656144 B CN101656144 B CN 101656144B CN 2009101682524 A CN2009101682524 A CN 2009101682524A CN 200910168252 A CN200910168252 A CN 200910168252A CN 101656144 B CN101656144 B CN 101656144B
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- 238000003199 nucleic acid amplification method Methods 0.000 title abstract description 7
- 230000002401 inhibitory effect Effects 0.000 title abstract description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0014—Capacitor filters, i.e. capacitors whose parasitic inductance is of relevance to consider it as filter
Abstract
The invention provides a device for inhibiting harmonic amplification on third winding side of an ultrahigh voltage transformer, comprising four groups of parallel capacitors, wherein each group comprises three capacitors and three reactors; each capacitor is in series connection with the reactor; three capacitors in each group have identical capacity; and three reactors in each group have identical capacity; the capacity of all capacitors in four parallel capacitors have identical capacity; for four parallel capacitors, each reactor in two groups is the first capacity, while the reactors in the other groups are the second capacity, namely reactors with two capacities are used for mixed arrangement. Compared with the prior art of using reactors with one capacity on the third winding side of the ultrahigh voltage transformer, the invention can inhibit harmonic amplification on the third winding side of the ultrahigh voltage transformer.
Description
Technical field
The present invention relates to the extra-high voltage electric transmission and transformation technical field, particularly a kind of device that suppresses the amplification of extra-high voltage transformer tertiary winding side harmonic wave.
Background technology
China has successfully built up 1000kV extra-high-voltage alternating current experiment and demonstration engineering.1000kV extra-high-voltage alternating current experiment and demonstration engineering comprises 2 transformer stations in the southeast, Shanxi and Jingmen and Nanyang switchyard.Three groups of rated voltages of the main transformer of transformer station are respectively 1000kV, 500kV and 110kV.
At present, in the extra-high voltage transmission of China 330kV, 500kV and 750kV, the rated voltage of the low-pressure side of the main transformer of transformer station generally is no more than 66kV, and all adopts earth-free mode.In order to satisfy the requirement of transmission system voltage control and reactive power, need shunt capacitor be installed at the tertiary winding of main transformer.But shunt capacitor can cause the problem that the transmission system harmonic wave amplifies.Therefore, the reactor of the general constant volume of connecting on shunt capacitor is used for suppressing the harmonic wave amplification that shunt capacitor causes.
In the low-pressure side of China 500kV transforming plant main transformer depressor, the capacity of the reactor of connecting with shunt capacitor is generally all elected 5% of condenser capacity as at present.But the situation of only 5 times and above harmonic wave not being amplified after the reactor of this capacity and the capacitors in series is effective.According to actual measured results, 3 subharmonic content are still more serious in the transmission system.
And for the system for ultra-high voltage transmission of 1000kV, how the capacitor of the tertiary winding side of main transformer and reactor capacity choose at present also not research both at home and abroad.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of device that extra-high voltage transformer tertiary winding side harmonic wave amplifies that suppresses, and can suppress the harmonic wave amplification that extra-high voltage transformer tertiary winding side shunt capacitor causes well.
The invention provides a kind of device that extra-high voltage transformer tertiary winding side harmonic wave amplifies that suppresses, described device comprises four groups of Shunt Capacitor Unit;
Every group of Shunt Capacitor Unit comprises: three capacitors and three reactors; Each capacitor is connected with a reactor; Three condenser capacities in every group are identical, and the capacity of three reactors is identical;
All capacitor volume in four groups of Shunt Capacitor Unit are all identical;
In described four groups of Shunt Capacitor Unit, wherein each reactor in two groups is all selected first capacity; Each reactor in other two groups is all selected second capacity.
Preferably, described first capacity is specially: the percentage range that the capacity of each reactor accounts for the condenser capacity of series connection with it is 11%-13%; Described second capacity is specially: the percentage range that the capacity of each reactor accounts for the condenser capacity of series connection with it is 4%-6%.
Preferably, described first capacity is specially: the percentage that the capacity of each reactor accounts for the condenser capacity of series connection with it is 12%; Described second capacity is specially: the percentage that the capacity of each reactor accounts for the condenser capacity of series connection with it is 5%.
Preferably, the total capacity of three capacitors is 210Mvar in every group of Shunt Capacitor Unit.
Compared with prior art, the present invention has the following advantages:
The device that inhibition extra-high voltage transformer tertiary winding side harmonic wave provided by the invention amplifies by in extra-high voltage transformer tertiary winding side four group capacitor groups in parallel, comprises three capacitors and three reactors in each capacitor group; Reactor of each capacitors in series.And in the four group capacitor groups, choose two kinds of reactor capacity altogether, wherein all reactors in the two group capacitor groups are got first capacity; All reactors in the other two group capacitor groups are chosen second capacity.Promptly adopt the reactor of two kinds of capacity to load in mixture.Only take a kind of reactor of capacity to compare with EHV transformer tertiary winding side in the prior art, the harmonic wave that the present invention can fine inhibition extra-high voltage transformer tertiary winding side amplifies.
Description of drawings
Fig. 1 is apparatus of the present invention first example structure figure;
Fig. 2 is Shunt Capacitor Unit schematic diagram of the embodiment of the invention.
Embodiment
For those skilled in the art being understood better and implementing the present invention, below at first in conjunction with derivation of the present invention under the actual engineering introduction.
According to the analysis of extra-high voltage grid harmonic source, the 500kV electrical network is main harmonic source.But the controllable parallel reactors of 1000kV side installing becomes potential harmonic source owing to there are a large amount of power electronic device.Therefore need the further harmonic characterisitic of research controllable parallel reactors.The inventor has carried out simulation calculation to the harmonic wave generating capacity of capacity from 0～100% change procedure of controllable parallel reactors.For the harmonic wave situation of truer reflection controllable parallel reactors itself, rectification becomes the primary side filter all less than dropping in the emulation, and simultaneously, rectifier is got energy from controllable parallel reactors control winding.
Following mask body step-by-step instructions harmonic analysis process.
The first step: system equivalent research
Be subjected to the restriction of simulation scale, when carrying out harmonic analysis, need carry out equivalence the data of the whole network.Equivalent principle reservation 1000kV system for ultra-high voltage transmission and the southeast, Shanxi power plant, station, 500kV Jincheng, Shanxi, 500kV bamboo hat station, Hubei.And North China network equivalence machine is hung over Jincheng, the equivalent machine of Central China Power Grid is hung over bamboo hat.
Second step: ultra high voltage 500kV, 220kV side background harmonics testing research
Background harmonics to ultra-high voltage transformer station Jingmen and station, the southeast, Shanxi 500kV side predicts, and consider the direct current that puts into operation, controlled height is anti-and the influence of harmonic source such as electric railway.At present, station, Jingmen is a switchyard, can directly measure.In addition, after building up, station, the southeast, Shanxi will between Yushe switchyard and Jincheng transformer station, insert the southeast, Shanxi electrical network, should select the nearest transformer station in ultra high voltage access point both sides to carry out the electric energy quality test analysis, but, therefore select Linfen transformer station and Yushe switchyard as measuring point because Jincheng 500kV does not build up yet at present.
The 3rd step: stable state harmonic wave research
According to the background harmonics estimated value, consider the harmonic wave that extra-high voltage transformer produces when load factor is low, whether the harmonic wave that produces in harmonic wave that produces during shunt reactor generation magnetic saturation and the shunt reactor running when studying different series reactor capacity, the harmonic wave scale-up problem can take place.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, this figure is apparatus of the present invention first example structure figure.
Present embodiment provides the device that suppresses the amplification of extra-high voltage transformer tertiary winding side harmonic wave to comprise four groups of Shunt Capacitor Unit; Be respectively the first Shunt Capacitor Unit 101a, the second Shunt Capacitor Unit 101b, the 3rd Shunt Capacitor Unit 101c and the 4th Shunt Capacitor Unit 101d.
Every group of Shunt Capacitor Unit comprises: three capacitors and three reactors; Each capacitor is connected with a reactor; Three condenser capacities in every group are identical, and the capacity of three reactors is identical.
With first group of Shunt Capacitor Unit 101a is example, and the capacity of three capacitor Xc1 capacity identical, three reactor XL1 is identical.Each capacitor Xc1 and a reactor XL1 series connection, series connection is parallel on the phase power transmission line of transmission line later.Capacitor and reactor after three phase transmission line three series connection in parallel respectively.
In described four groups of Shunt Capacitor Unit, wherein each the reactor capacity in two groups is identical, is designated as first capacity; Each reactor capacity in other two groups is identical, is designated as second capacity.
Among the first Shunt Capacitor Unit 101a, the second Shunt Capacitor Unit 101b, the 3rd Shunt Capacitor Unit 101c and the 4th Shunt Capacitor Unit 101d, wherein the reactor XL2 among the reactor XL1 among the first Shunt Capacitor Unit 101a and the second Shunt Capacitor Unit 101b adopts identical capacity, is designated as first capacity.Reactor XL4 among reactor XL3 among the 3rd Shunt Capacitor Unit 101c and the 4th Shunt Capacitor Unit 101d adopts identical capacity, is designated as second capacity.
All capacitor volume in four groups of shunt capacitors are all identical; Promptly the reactor Xc3 among the capacitor Xc1 among the first Shunt Capacitor Unit 101a, the reactor Xc2 among the second Shunt Capacitor Unit 101b, the reactor Xc2 among the 3rd Shunt Capacitor Unit 101c and the 4th Shunt Capacitor Unit 101d adopts identical capacity.
The present invention has carried out harmonic analysis to the Shunt Capacitor Unit of the reactor of tertiary winding side (being the 110kV side) the series connection different capabilities of the extra-high voltage transformer at the southeast, Shanxi and station, Jingmen.Specifically study reactance Rate and be respectively 1.5%, 5%, 12% and various reactance Rate situation about loading in mixture.
First kind: the series reactance rate is 1.5% o'clock system's bus harmonic voltage at different levels
Studies have shown that and exist tangible harmonic wave to amplify when adopting 1.5% reactance Rate.
Because the parallel resonance near 5 work frequencies has appearred in the 110kV side, therefore the aberration rate of 5 subharmonic voltages is up to 16.8%.Make harmonic voltage resultant distortion rate also reach 17.0%.System harmonics changes not quite when dropping into two groups of Shunt Capacitor Unit, but 110kV side bus harmonic voltage will raise, and will influence the normal operation of capacitor.
Second kind: the series reactance rate is 5% o'clock system's bus harmonic voltage at different levels
Studies have shown that and exist tangible harmonic wave to amplify when adopting 5% reactance Rate.
System harmonics changes not quite when dropping into one group of Shunt Capacitor Unit, but 110kV side bus harmonic voltage will slightly raise.But when dropping into 2 groups of Shunt Capacitor Unit, because the parallel resonance frequency of 110kV system is between 3 power frequencies and 4 power frequencies, and in 500kV side background harmonics, 3 order harmonic components are bigger, therefore in the 110kV busbar voltage aberration rate of 3 subharmonic than higher.
The third: the series reactance rate is 12% o'clock system's bus harmonic voltage at different levels
Very little to the system harmonics influence when dropping into one group or two groups of Shunt Capacitor Unit, capacitor also can normally move.Because string 12% reactance Rate will reduce the capacitor utilance, cause the waste of condenser capacity.
The 4th kind: system's bus harmonic voltages at different levels when series connection 12% and 5% reactance Rate loads in mixture
Better when system harmonics is suppressed effect than two group of 12% reactance Rate, and can improve the capacitor utilance.
Therefore, the embodiment of the invention preferably adopts two kinds of reactance Rate to load in mixture, and promptly 12% and 5%, the first capacity is that 12%, the second capacity is 5%.Percentage herein is that the capacitance of series connection with it is a benchmark.For example, the capacity of XL1 is 12% of an Xc1 capacity, the capacity of XL3 be Xc3 capacity 5%.
Need to prove that first capacity and second capacity are not changeless values, can select according to actual needs that the span of preferred first capacity of the embodiment of the invention and second capacity is respectively: 11%-13% and 4%-6%.
In the embodiment of the invention in every group of Shunt Capacitor Unit of the extra-high voltage transformer tertiary winding side total capacity of three capacitors be 210Mvar.One of them capacitor volume is 70Mvar just.Be that 12 capacitor volume among Fig. 1 are 70Mvar.
Referring to Fig. 2, this figure is Shunt Capacitor Unit schematic diagram of the embodiment of the invention.
A Shunt Capacitor Unit comprises three capacitors and three reactors, and each capacitor is connected with a reactor.Whole Shunt Capacitor Unit is connected in parallel on the three-phase bus of transmission line.
As shown in Figure 2, capacitor Xc1 be connected in parallel on three-phase bus A, the B and C of transmission line after reactor XL1 connects.
Shunt capacitor can be used for the reactive power of balance sysmte on transmission line, but capacitor can bring the problem that harmonic wave increases simultaneously, therefore need be on shunt capacitor series reactor, suppress the increase of harmonic wave.But the capacity of series reactor is chosen very crucial.If it is big that the capacity of series reactor selects, can reduce the idle of capacitor and exert oneself, offset capacitor volume, cause the waste of condenser capacity, and then strengthen system cost.If it is little that the capacity of series reactor is chosen, can low-order harmonic not had inhibitory action again.Therefore, the present invention is through the practical study analytical proof, and in the tertiary winding side of extra-high voltage transformer, promptly the 110kV side is installed four groups of Shunt Capacitor Unit, and wherein two groups of capacity of choosing series reactor are 5% of condenser capacity; Other two groups of capacity of choosing series reactor are 12% of condenser capacity.It is fine like this system harmonics to be suppressed effect, simultaneously capacitor volume is played one's part to the full, and does not cause waste.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (3)
1. one kind is suppressed the device that extra-high voltage transformer tertiary winding side harmonic wave amplifies, and it is characterized in that described device comprises four groups of Shunt Capacitor Unit;
Every group of Shunt Capacitor Unit comprises: three capacitors and three reactors; Each capacitor is connected with a reactor; Three condenser capacities in every group are identical, and the capacity of three reactors is identical;
All capacitor volume in four groups of Shunt Capacitor Unit are all identical;
In described four groups of Shunt Capacitor Unit, wherein each reactor in two groups is all selected first capacity; Each reactor in other two groups is all selected second capacity.
Described first capacity is specially: the percentage range that the capacity of each reactor accounts for the condenser capacity of series connection with it is 11%-13%; Described second capacity is specially: the percentage range that the capacity of each reactor accounts for the condenser capacity of series connection with it is 4%-6%.
2. the device that inhibition extra-high voltage transformer tertiary winding side harmonic wave according to claim 1 amplifies, it is characterized in that described first capacity is specially: the percentage that the capacity of each reactor accounts for the condenser capacity of series connection with it is 12%; Described second capacity is specially: the percentage that the capacity of each reactor accounts for the condenser capacity of series connection with it is 5%.
3. the device that amplifies according to each described inhibition extra-high voltage transformer tertiary winding side harmonic wave of claim 1-2 is characterized in that, the total capacity of three capacitors is 210Mvar in every group of Shunt Capacitor Unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101682524A CN101656144B (en) | 2009-08-20 | 2009-08-20 | Device for inhibiting harmonic amplification on third winding side of ultrahigh voltage transformer |
| PCT/CN2010/001257 WO2011020302A1 (en) | 2009-08-20 | 2010-08-19 | Device for inhibiting harmonic amplification on the third winding side of extra-high voltage /ultra-high voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101682524A CN101656144B (en) | 2009-08-20 | 2009-08-20 | Device for inhibiting harmonic amplification on third winding side of ultrahigh voltage transformer |
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| CN101656144A CN101656144A (en) | 2010-02-24 |
| CN101656144B true CN101656144B (en) | 2011-01-12 |
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| CN101656144B (en) * | 2009-08-20 | 2011-01-12 | 中国电力科学研究院 | Device for inhibiting harmonic amplification on third winding side of ultrahigh voltage transformer |
| CN103344853A (en) * | 2013-06-24 | 2013-10-09 | 国家电网公司 | Method for judging faults of parallel capacitors by means of natural vibration frequency |
| CN107465199A (en) * | 2017-09-21 | 2017-12-12 | 合容电气股份有限公司 | A kind of extra-high-voltage alternating current engineering assembling shunt capacitor equipment |
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| TR200600371A2 (en) * | 2006-01-30 | 2007-10-22 | Global Enerji̇ Yatirimlari A.Ş. | Harmonic absorber. |
| CN201174598Y (en) * | 2008-04-10 | 2008-12-31 | 延边国大节能技术设备有限公司 | Transient anti-harmonic type reactive power auto-compensation apparatus |
| CN101656144B (en) * | 2009-08-20 | 2011-01-12 | 中国电力科学研究院 | Device for inhibiting harmonic amplification on third winding side of ultrahigh voltage transformer |
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| CN101656144A (en) | 2010-02-24 |
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