CN104021926A - Novel power transformer with functions of direct current magnetic bias and reactive compensation - Google Patents
Novel power transformer with functions of direct current magnetic bias and reactive compensation Download PDFInfo
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- CN104021926A CN104021926A CN201410280535.9A CN201410280535A CN104021926A CN 104021926 A CN104021926 A CN 104021926A CN 201410280535 A CN201410280535 A CN 201410280535A CN 104021926 A CN104021926 A CN 104021926A
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Abstract
The invention relates to a novel power transformer with functions of direct current magnetic bias and reactive compensation. The novel power transformer comprises electric reactors and a transformer body, wherein the electric reactors wind transformer side masts, the transformer body comprises an iron core and windings, and the iron core comprises a first side mast, a second side mast, a main core mast and a two-phase magnetic material. By virtue of the special arrangement of the windings, the magnet integration of the electric reactors and the transformer body is realized, and the inductance can be invoked to perform reactive compensation; a current sensor is established to detect bias magnet flux, and the intelligent conversion of a magnetic conduction function and a direct current excitation function of the two-phase magnetic material can be realized through a control device so as to detect, control and eliminate the direct current magnetic bias of the transformer.
Description
Technical field
The present invention relates to electrical engineering field, specifically refer to a kind of integrated controlled reactor, can realize the power transformer with intelligent characteristic of D.C. magnetic biasing compensation and no-power compensation function.
Background technology
Since twentieth century the seventies and eighties, along with the development of superhigh pressure remote conveying electric system and the aggravation of power system load variable effect, reactive power consumption in electrical network increases day by day, and reactive power deficiency is to cause the key factor that China's quality of power supply is not high and waste.Controlled reactor and capacitor group are also moved mutual coordination and can be regulated idle.So at ultra high voltage or superhigh pressure, in jumbo electrical network, certain reactive power compensator is installed and is controlled reactive power flow, stablize the working voltage of electrical network.A large amount of theoretical research and facts have proved, regulate reactance to have significant effect for the runnability that improves electric power system, the particularly application of controlled reactor, its capacity can change automatically along with the size of through-put power, too high power frequency switching overvoltage and corresponding transient state concussion overvoltage that circuit one side switch produces while suiting are prevented, also can reduce grid loss, improve the quality of power supply, brought huge economic benefit and social benefit simultaneously.So the research of controlled reactor more and more becomes countries nowadays Power decision and Electric Design personnel's common objective.
Nineteen sixty-five, General Electric Co. Limited of Britain manufactured First controlled reactor in the world, 1977 ~ 1978 years, GE company of the U.S., Westinghouse Electric and BBC company successively develop the static compensation device, superhigh pressure TCT type static compensation device, the thyristor-controlled reactor (TCR) that adopt thyristor control.1986, the former Soviet Union proposed novel controlled reactor structure, thereby makes saturated controllable reactor have breakthrough, and reactor performance has had greatly to be improved.The researcher of Japan has proposed the controlled reactor based on controlling magnetic flux principle orthocore subsequently; More American-European countries also start controlled reactor to study.In the last few years, the research to controllable electrical appliance of Chinese scholars and scientific research institution, all obtain in many aspects achievement, as controlled reactor, the transformer type controlled reactor based on controllable load principle, orthocore formula controlled reactor, the ultra-high/extra-high voltage controlled reactor etc. based on flux-gate principle controlled based on PWM.
Domestic the research of controlled reactor is mainly concentrated in direct-current controllable reactor and Controllable Reactor.Aspect direct-current controllable reactor, Wuhan University, Shanghai Communications University and North China Electric Power University conduct in-depth research.Aspect AC reactor, Zhejiang University, the Central China University of Science and Technology have launched the research of this aspect.The former Wuhan Water Conservancy and Electric Power Univ of China started novel controlled reactor to study in nineteen ninety, and had obtained a series of achievement in research.Within 1977, succeed in developing the automatic tuning arc depression coil based on magnetic valve type controllable reactor, within 1988, develop the controlled reactor of 27.5KV electric railroad dynamic passive compensation, be just devoted to more theory and the application study of voltage levels, more jumbo controlled reactor at present.The research of ultra high voltage controlled reactor is also had to the institution of higher learning such as Hunan University, Xi'an Communications University, Zhejiang University, the Central China University of Science and Technology, and the business unit such as Hengyang Transformer Co., Ltd., Tebian Electric Co., special power transformation work Shenyang transformer Co., Ltd and Xi'an transformer Co., Ltd.
Along with the electric power development general policy of China's " transferring electricity from the west to the east; north and south supplies mutually; national network ", HVDC Transmission Technology will become the interconnected main solution route of nationwide integrated power grid, and therefore DC transmission system stable operation has important function for the safety and stability of whole electrical network.But along with large capacity, the long application apart from direct current transportation, the grounding electrode electric current of the DC transmission system of moving with the earth echo plex mode can flow through Transformer Winding by transformer neutral point, causes transformer DC magnetic bias phenomenon.The direct current that transformer neutral point is introduced is in the inner D.C. magnetic biasing that forms of transformer, can make magnetic flux unshakable in one's determination seriously saturated, exciting current high distortion, produce a large amount of harmonic waves, noise obviously increases, and hardware loss increases, reactive loss increases, when serious, may cause local overheating phenomenon, destroy insulation, so that damage transformer or reduce the life-span.
On March 13rd, 1989; DC magnetic bias phenomena causes Quebec, CAN hydroelectric power generation interruption; the large-sized booster transformer in power station, east coast of the united states is ruined; the copper connector lug that wherein connects two low pressure winding conducting wires burns; the protective relaying maloperation of electrical network SVC device is done, and a large amount of capacitors are out of service, system voltage collapse; finally lose 9500MW load, grid disconnection nearly 9 hours.
1992; US Experts is taking hydroelectric station, Quebec Radisson/LG2 association as object; the scheme of several inhibition direct currents has been proposed; its method is by the neutral line less capacitor of power frequency impedance of connecting; with gap, can triggered gap and MOV etc. realize the quick overvoltage protection of neutral point capacitor, scheme is also equipped with mechanical by-pass switch.4 cover transformers at the beginning of DEI company of the U.S. 1996, are developed every straight device; The parameter development providing according to SIEMENS company again for 2003 10 cover transformers every straight device, and for the transformer near a HVDC terminal station of India.This installs by 1 4000uF(50Hz) form every straight/logical alternating current container and 2 groups of antiparallel large current bypass passages and mechanical switch bypass.
There is D.C. magnetic biasing problem in China's power network.In two groups of 500kVA main transformers of Changzhou Wu Nan transformer station in the upper river of Jiangsu 500kV main transformer, the flat 500kV DC transmission system of Three Gorges dragon's fountain one Jiangsu political affairs, expensive wide DC line, spring city station owner's transformer is all subject to the impact of D.C. magnetic biasing.Applicant carried out the research about D.C. magnetic biasing problem since 1996, had once analyzed the D.C. magnetic biasing problem (2-11 ampere bias current detected, cause the noise up to 90 decibels) of 220,000 volts of 180,000 kilovolt-amperes of power transformers appearance of Fushun power office triumph primary station in 2007.D.C. magnetic biasing problem more and more obtains the extensive concern of Chinese scholar, and many scholars also conduct a research and develop compensation arrangement D.C. magnetic biasing problem for many years.Tsing-Hua University has proposed the inhibition of a kind of small resistor device for transformer neutral point DC magnetic biasing.This device is mainly made up of a noninductive resistance and gap, and has carried out at the scene installation and checkout in 2005, has positive effect to suppressing Transformer's Neutral Line Direct Current.Have scholar to introduce the method for transformer neutral point injection reverse dc, its cardinal principle is that power supply injects reverse dc through the auxiliary earth utmost point and transformer neutral point loop to transformer neutral point through silicon rectifier again after voltage regulator.Within 2007, there is scholar to propose a kind of new method of the inspection of the school based on potential compensation principle transformer neutral point DC current, its principle is a small resistor of series connection in the middle of the transformer neutral line, on this resistance, form a dc point position by external power source, regulate the dc point position of transformer neutral point to reach the object that reduces inflow transformer winding direct current with this.Domesticly also carry out the research and development work of electric capacity every straight device.The colleges and universities such as North China Electric Power University, Xi'an Communications University, Zhejiang University also all do a lot of work, and have effectively suppressed the impact of transformer DC magnetic bias.
But all there is certain problem in the whole bag of tricks.Small resistor current limliting method cannot be eliminated neutral point direct current completely, sometimes has to adopt the resistance of larger resistance, likely affects main transformer neutral point insulation intensity; Although electric capacity can be eliminated neutral point direct current preferably every straight method, affects the effective grounding of transformer, higher to main transformer neutral point insulation requirement of strength, reply short circuit malfunction ability is poor; Neutral point injects reverse current lambda limiting process need to build the compensation of ground utmost point in addition, and choosing of compensation earth polar is extremely difficult.And at remote conveying electric system, the efficiency of offset current will reduce, and the power of DC generator will double, earth mat burden has also been increased the weight of in large electric inflow place, accelerates ground net corrosion, and application cost is high; Potential compensation method power consumption is large, install more expensive, compensation earth polar choose also more difficult.
Summary of the invention
Goal of the invention:
In order to address the above problem, the present invention proposes a kind of novel electric power transformer that has D.C. magnetic biasing and no-power compensation function concurrently, controlled reactor is integrated in to power transformer as reactance winding, form new transformer iron core structure, thereby reach the object that is realized D.C. magnetic biasing and reactive power compensation by power transformer self.
Technical scheme:
The present invention implements by the following technical programs:
A kind of novel electric power transformer that has D.C. magnetic biasing and no-power compensation function concurrently, comprise reactor and transformer, reactor is wound on the other post of transformer, it is characterized in that: reactor comprises left side reactor winding and right side reactor winding, left side reactor winding technique on the other post of transformer first, right side reactor winding technique on the other post of transformer second, and left side reactor winding and right side reactor winding are all made up of equal turn numbers opposite direction two sections windings in series; Transformer comprises iron core and winding; Iron core comprises the first other post, the second other post, main stem and two-phase magnetic material, and the first other post and the second other post are arranged on the both sides of main stem, and two-phase magnetic material is separately positioned on the outside of the first other post and the second other post; Winding comprises first side winding, secondary side winding and compensation control winding, and first side winding and secondary side winding are wound on the main stem of transformer; Compensation is controlled winding technique on two-phase magnetic material; Compensation is controlled winding and is connected with detection control system, and the first side winding lead-out wire of first side winding connects current sensor.
The top of right side two-phase magnetic material is provided with the first air gap, and the bottom of right side two-phase magnetic material is provided with interstice, and the middle part of the second other post is provided with the 3rd air gap; The top of left side two-phase magnetic material is provided with the 4th air gap, and the bottom of left side two-phase magnetic material is provided with the 5th air gap, and the middle part of the first other post is provided with the 6th air gap.
Compensation is controlled winding and is arranged on two-phase magnetic material both sides.
Advantage and effect:
The present invention utilizes the magnetic conduction of two phase materials, not magnetic conduction and the effectively conversion between characteristic of magnetizing.Realize transformer and there are several merit conversion of energies, as: regulative reactance, idle adjusting, D.C. magnetic biasing compensation.First, be integrated in transformer by the special arrangement of reactor winding, can reach with the full decoupled object of Transformer Winding and can realize again the adjustable effect of inductance; Secondly, for transformer self, the present invention is different, and conventional electric power transformer DC magnetic bias suppresses scheme, on the one hand, can not produce any impact to transformer neutral point, on the other hand, without selecting compensation earth polar, to earth mat, without any corrosion, in remote conveying electric system, compensation efficiency is higher especially.Therefore, the net safe operation hidden danger that can not increase electric power because of the compensation of bias current.Set up effective structural system in transformer inside, realize the effective ways that suppress transformer DC magnetic bias.The ability that suppresses D.C. magnetic biasing impact is provided on transformer electromagnetism operation mechanism, and does not change the connection of power transformer external circuit (particularly neutral point), only need very little direct current, just can produce stronger compensation magnetic flux.Fundamentally solve D.C. magnetic biasing problem, and can ensure transformer safe operation.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Description of reference numerals:
1, reactor, 2, transformer, 3, left side reactor winding, 4, right side reactor winding, 5, the first other post, 6, the second other post, 7, main stem, 8, two-phase magnetic material, 9, first side winding, 10, secondary side winding, 11, compensation controls winding, 12, detect control system, 13, current sensor, 14, first side winding lead-out wire, 15, the first air gap, 16, interstice, 17, the 3rd air gap, 18, the 4th air gap, 19, the 5th air gap, 20, the 6th air gap.
Embodiment
Below in conjunction with accompanying drawing, the present invention is specifically described:
The present invention proposes a kind of novel electric power transformer that has D.C. magnetic biasing and no-power compensation function concurrently, by the combination of transformer, reactor and control system, form the energy-conserving intelligent power transformer with D.C. magnetic biasing compensation and reactive power compensation ability.This transformer by detecting, the real-time detection of grid of control system is idle state and transformer suffer the situation of D.C. magnetic biasing, need transformer to regulate electric network reactive-load and D.C. magnetic biasing is made to when compensation when system detects, control the conversion of two-phase magnetic material between magnetic conduction and DC excitation function, complete transformer " detect, control and eliminate " to reactive power compensation and D.C. magnetic biasing.The integrated controlled reactor of this novel transformer, in one, has the effect of transformer self transformation; And realize the function of D.C. magnetic biasing compensation by the self-control of self inherent magnetic state; Finally, the ability of controlled reactor in order to the reactive power distribution of adjusting circuit be can bring into play, reactive power compensation, harmonic filtration object well realized.This transformer has fully phased out D.C. magnetic biasing compensation and cancellation element that traditional transformer is introduced at external circuit, has avoided any change to power transformer neutral ground connected mode in addition, ensure the safety ground of transformer neutral point, and then can ensure the operation of transformer safety.
Operation principle of the present invention:
First, special arrangement by winding is integrated in power transformer using controlled reactor as reactance winding, can realize that reactor and transformer magnet are integrated, winding decoupling zero and reduce equipment and take up an area object, can reach and utilize controlled reactor to regulate idle object again.Secondly, adopt novel two-phase magnetic material, form new transformer iron core structure, by setting up detection system, control winding and realize the intelligent conversion of this two-phase magnetic material between magnetic conduction function and DC excitation function, complete " detect, control and elimination " of DC magnetic bias phenomena to transformer.Thereby reach the object that is realized the compensation of main flow magnetic bias by power transformer self.
In the time that electric power system needs reactive power compensation, idle component is sent into and detected control system 12, detect control system 12 and send direct current to compensation control winding, produce the idle component that electric power system needs, compensate.In the time there is DC magnetic bias phenomena in transformer 2, by current sensor 13, DC magnetic bias current signal is sent into and detected control system 12, then detect control system 12 and send direct current to compensation control winding 11, produce the compensation magnetic flux contrary with bias current and suppress D.C. magnetic biasing, due to the existence of interstice 16 and the 4th air gap 18, make to compensate magnetic flux and can not flow in the first other post 5 and the second other post 6, finally make compensation, process of inhibition complete in main stem 7; In the time of transformer 2 D.C. magnetic biasings disappearances or non DC bias phenomenon, by current sensor 13, detection signal to be sent into and detected control system 12, detection control system 12 produces single-phase sinusoidal voltage two-phase magnetic material 8 is demagnetized.Due to the existence of the 3rd air gap 17, the exchange flux producing while making transformer 2 normal work can not exert an influence to compensation magnetic.
This kind provided by the invention has the novel electric power transformer of D.C. magnetic biasing and no-power compensation function concurrently, as shown in fig. 1, described novel electric power transformer comprises reactor 1 and transformer 2 two parts, reactor 1 is wound on the other post of transformer 2, it is characterized in that: reactor 1 comprises left side reactor winding 3 and right side reactor winding 4, left side reactor winding 3 is wound on the other post 5 of transformer first, right side reactor winding 4 is wound on the other post 6 of transformer second, and left side reactor winding 3 and right side reactor winding 4 are all made up of equal turn numbers opposite direction two sections windings in series, arrange like this can make transformer and reactor full decoupled, inductance value is adjustable, and the occupying volume external space not, significantly reduce the wastage, transformer 2 comprises iron core and winding, iron core comprises that the first other post 5, the second other post 6, main stem 7 and the other post 5 of two-phase magnetic material 8, the first and the second other post 6 are arranged on the both sides of main stem 7, and two-phase magnetic material 8 is separately positioned on the outside of the first other post 5 and the second other post 6, winding comprises first side winding 9, secondary side winding 10 and compensation control winding 11, and first side winding 9 and secondary side winding 10 are wound on the main stem 7 of transformer, compensation is controlled winding 11 and is wound on two-phase magnetic material 8, compensation is controlled winding 11 and is connected with detection control system 12, and the first side winding lead-out wire 14 of first side winding 9 connects current sensor 13.
The top of right side two-phase magnetic material 8 is provided with the first air gap 15, and the middle part that the bottom of right side two-phase magnetic material 8 is provided with interstice 16, the second other posts 6 is provided with the 3rd air gap 17; The top of left side two-phase magnetic material 8 is provided with the 4th air gap 18, and the middle part that the bottom of left side two-phase magnetic material 8 is provided with the 5th air gap 19, the first other posts 5 is provided with the 6th air gap 20.
Compensation is controlled winding 11 and is arranged on two-phase magnetic material 8 both sides, detects control system 12 and is connected with compensation control winding 11; Transformer first side winding 9, secondary side winding 10 are normally worked.
This novel electric power transformer that has D.C. magnetic biasing and no-power compensation function concurrently of the present invention, arrange and realize the integrated of transformer and controlled reactor with reverse coiling by special winding, have that transformer and reactor are full decoupled, inductance value is adjustable, not the occupying volume external space and the distinguishing feature that reduces the wastage.For D.C. magnetic biasing compensation arrangement, set up current sensor and detect magnetic bias magnetic flux, then realize the intelligent conversion of this two-phase magnetic material between magnetic conduction function and DC excitation function by control device, complete " detect, control and eliminate " of the DC magnetic bias phenomena to transformer.There is the ability of transformer self-compensation situation D.C. magnetic biasing and idle adjusting, reduce transformer loss, energy-saving effect is obvious, obtains certain economic benefit, whole electric power system is had to great practical significance, for intelligent power network safe operation provides a kind of energy-saving type intelligent power equipment.
Claims (3)
1. one kind has the novel electric power transformer of D.C. magnetic biasing and no-power compensation function concurrently, comprise reactor (1) and transformer (2), reactor (1) is wound on the other post of transformer (2), it is characterized in that: reactor (1) comprises left side reactor winding (3) and right side reactor winding (4), left side reactor winding (3) is wound on transformer the first other post (5), right side reactor winding (4) is wound on transformer the second other post (6), and left side reactor winding (3) and right side reactor winding (4) are all made up of equal turn numbers opposite direction two sections windings in series, transformer (2) comprises iron core and winding, iron core comprises the first other post (5), the second other post (6), main stem (7) and two-phase magnetic material (8), the first other post (5) and the second other post (6) are arranged on the both sides of main stem (7), and two-phase magnetic material (8) is separately positioned on the outside of the first other post (5) and the second other post (6), winding comprises first side winding (9), secondary side winding (10) and compensation control winding (11), and first side winding (9) and secondary side winding (10) are wound on the main stem of transformer (7), compensation is controlled winding (11) and is wound on two-phase magnetic material (8), compensation is controlled winding (11) and is connected with detection control system (12), and the first side winding lead-out wire (14) of first side winding (9) connects current sensor (13).
2. the novel electric power transformer that has D.C. magnetic biasing and no-power compensation function concurrently according to claim 1, its air gap is characterised in that: the top of right side two-phase magnetic material (8) is provided with the first air gap (15), the bottom of right side two-phase magnetic material (8) is provided with interstice (16), and the middle part of the second other post (6) is provided with the 3rd air gap (17); The top of left side two-phase magnetic material (8) is provided with the 4th air gap (18), and the bottom of left side two-phase magnetic material (8) is provided with the 5th air gap (19), and the middle part of the first other post (5) is provided with the 6th air gap (20).
3. the novel electric power transformer that has D.C. magnetic biasing and no-power compensation function concurrently according to claim 1, its compensation arrangement is characterised in that: compensation is controlled winding (11) and is arranged on two-phase magnetic material (8) both sides.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410280535.9A CN104021926B (en) | 2014-06-20 | 2014-06-20 | A kind of power transformer having D.C. magnetic biasing and no-power compensation function concurrently |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410280535.9A CN104021926B (en) | 2014-06-20 | 2014-06-20 | A kind of power transformer having D.C. magnetic biasing and no-power compensation function concurrently |
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| CN104021926A true CN104021926A (en) | 2014-09-03 |
| CN104021926B CN104021926B (en) | 2016-03-30 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184335A (en) * | 2014-09-11 | 2014-12-03 | 山东大学 | Multifunctional transformer with double transformer bodies connected in series |
| CN105226624A (en) * | 2015-11-11 | 2016-01-06 | 广州普瑞电力控制系统设备有限公司 | The method except direct current in alternating current system let out by employing superconduction earial drainage reactor |
| CN107066010A (en) * | 2017-06-05 | 2017-08-18 | 哈尔滨理工大学 | Quadrature field regulator and pressure regulation method |
| CN107342157A (en) * | 2017-08-08 | 2017-11-10 | 徐州鑫贝克电力设备有限公司 | A kind of power transformer based on nano material |
| CN113036765A (en) * | 2021-03-30 | 2021-06-25 | 国网河北省电力有限公司雄安新区供电公司 | Direct-current magnetic bias suppression device, method and control system |
| WO2022166228A1 (en) * | 2021-02-04 | 2022-08-11 | 中车株洲电力机车研究所有限公司 | Iron core magnetic circuit multiplexing method |
| CN117388780A (en) * | 2023-12-11 | 2024-01-12 | 国网江西省电力有限公司电力科学研究院 | Multi-element model-based transformer wide-area direct-current magnetic bias testing method and device |
| CN117388780B (en) * | 2023-12-11 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | Multi-element model-based transformer wide-area direct-current magnetic bias testing method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184335A (en) * | 2014-09-11 | 2014-12-03 | 山东大学 | Multifunctional transformer with double transformer bodies connected in series |
| CN105226624A (en) * | 2015-11-11 | 2016-01-06 | 广州普瑞电力控制系统设备有限公司 | The method except direct current in alternating current system let out by employing superconduction earial drainage reactor |
| CN107066010A (en) * | 2017-06-05 | 2017-08-18 | 哈尔滨理工大学 | Quadrature field regulator and pressure regulation method |
| CN107342157A (en) * | 2017-08-08 | 2017-11-10 | 徐州鑫贝克电力设备有限公司 | A kind of power transformer based on nano material |
| WO2022166228A1 (en) * | 2021-02-04 | 2022-08-11 | 中车株洲电力机车研究所有限公司 | Iron core magnetic circuit multiplexing method |
| CN113036765A (en) * | 2021-03-30 | 2021-06-25 | 国网河北省电力有限公司雄安新区供电公司 | Direct-current magnetic bias suppression device, method and control system |
| CN117388780A (en) * | 2023-12-11 | 2024-01-12 | 国网江西省电力有限公司电力科学研究院 | Multi-element model-based transformer wide-area direct-current magnetic bias testing method and device |
| CN117388780B (en) * | 2023-12-11 | 2024-05-14 | 国网江西省电力有限公司电力科学研究院 | Multi-element model-based transformer wide-area direct-current magnetic bias testing method and device |
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| CN104021926B (en) | 2016-03-30 |
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