CN104240899A - Novel three-phase separately excited magnetic control reactor - Google Patents
Novel three-phase separately excited magnetic control reactor Download PDFInfo
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- CN104240899A CN104240899A CN201310226715.4A CN201310226715A CN104240899A CN 104240899 A CN104240899 A CN 104240899A CN 201310226715 A CN201310226715 A CN 201310226715A CN 104240899 A CN104240899 A CN 104240899A
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a three-phase separately excited magnetic control reactor. A previous single-phase self-excited magnetic control reactor is modified. Compared with three single-phase magnetic control reactors, one three-phase magnetic control reactor only needs six core legs, raw materials are greatly saved, the size of the three-phase magnetic control reactor is decreased, and manufacturing and using economic benefits are improved. In addition, as the self-excited magnetic control reactor is low in excitation stability, the direct excitation current of a core is greatly affected once network voltage is unstable, and the reactive adjusting capacity of the reactor is affected. The three-phase magnetic control reactor is separately excited and specially provided with an independent excitation device, the direct current value of the magnetic control reactor is changed by controlling the excitation device, the capacity of the magnetic control reactor is further changed, the direct current value is less affected by external network states, and the excitation stability is greatly improved.
Description
Technical field
The present invention relates to a kind of three-phase separated exciting magnet controlled reactor of field of power, the single-phase self-excitation type magnet controlled reactor basis that original research is more is improved.
Background technology
According to the classification of reactor operating characteristic, reactor is divided into constant reactance device and controlled reactor.Constant reactance device be exactly in the course of the work its reactance value remain constant reactor, controlled reactor is then according to actual needs, can utilize the saturation characteristic of iron core, by change DC excitation change reactance value, the reactor of regulation output capacity.
Controlled reactor grows up on the basis of magnetic amplifier, proposes the concept of magnetic amplifier as far back as American in 1916, and in twentieth century fifties, scientific worker is incorporated into the operation principle of magnetic amplifier during power system reactive power controls automatically.Nineteen fifty-five in the world First controlled reactor manufacture successfully in Britain, rated capacity is 100MVA operating voltage is 6.6kV ~ 22kV, but this reactor governing speed is very slow, and active loss and material consumption are all very large, are not effectively promoted.
1986, the former Russian scholar proposed the concept of magnetic valve type controllable reactor, and the excitation by the DC control current of control loop changes the magnetic saturation of iron core, thus reaches the object of smooth adjustment reactance.In normal operation, only cored small cross-sectional area section (being referred to as magnet valve) is in saturation condition, and all the other iron leg cores are all in unsaturation linear condition.The capacity of reactor is changed by the core sataration degree changing magnet valve section, this Novel controllable electric reactor can be directly used in until the electrical network of any electric pressure of 1150kV is as continuously adjustable reactive power compensator, thus can directly be connected to super-high voltage trackside, play the effect of synchronous compensator and shunt reactor simultaneously.
Current controlled reactor application comparatively extensive, such as magnet controlled reactor is used as arc suppression coil, after solving single phase ground fault complete compensate and electrical network normally runs time resonance overvoltage between contradiction; The soft start-up scheme of saturable reactor is connected in series, the impact to electrical network when effectively reducing electric motor starting in motor stator sub-loop; In electric railway or community consumer unit become, replace the static var compensation system of saturable reactor with magnetic valve type controllable reactor, can effective compensating power, improve power factor, reduction network loss.
Summary of the invention
The present invention transforms magnet controlled reactor.Magnet controlled reactor is a kind of novel reactive-load compensation equipment, at present, and the magnet controlled reactor of the mainly single-phase self-excitation type that Application comparison is many.But, because self-excitation type magnet controlled reactor excitation stability is not high, once line voltage is unstable, DC excitation electric current unshakable in one's determination will be greatly affected, thus affect the Reactive-power control ability of device, so the excitation mode that present invention employs separated exciting is to improve the stability of excitation.That is, the present invention is that magnet controlled reactor is equipped with set of excitation device specially, by controlling excitation unit, just can change the DC current values in magnet controlled reactor, and then change the capacity of magnet controlled reactor, and this DC current values affects very little by extraneous electric network state, can be described as and provide stable DC excitation.
In addition, the body of magnet controlled reactor involved in the present invention adopts three-phase integratedization structure, is different from original phase structure.The magnet controlled reactor of this three-phase integratedization structure often has 2 to work unshakable in one's determination mutually, each work iron core is all wound with and exchanges main winding and DC control winding, electrical network is connected to, three-phase windings Y-connection, neutral-point solid ground after interchange main winding parallel connection on homophase 2 core limbs.Three-phase controlled winding is connected into double triangle, draws DC control end at vertex of a triangle place.The main core of magnet controlled reactor is all magnetic valve type structure.Owing to have employed limit magnetic saturation technology, within the scope of whole design capacity, heavy in section stack of lamination is in undersaturated condition all the time, only the iron core cutter of small bore section, and degree of saturation is very high, therefore can greatly reduce reactor harmonic wave and active loss.
Three-phase separated exciting magnet controlled reactor proposed by the invention is combined with the excitation system of separated exciting three-phase integratedization of magnet controlled reactor structure, a kind of novel magnet controlled reactor of proposition.
Three single-phase magnet controlled reactors are integrated into a three-phase magnetron reactor by the present invention.Existing single-phase magnet controlled reactor is single-phase three pillar type and single-phase four-column type two kinds mainly, and the three-phase magnetron reactor that the present invention proposes is three-phase six pillar, its role is to decrease return yoke branch road, decrease the use of core material, and then decrease floor space and manufacturing cost, thus practical more economically, application prospect is better.
Present invention employs the excitation mode of separated exciting.Relative to self-excitation type excitation system, separated exciting excitation system have employed independently excitation system, and principle is simple, and stability is high, and be easy to control, and high-low pressure is completely isolated, thyristor and circuits for triggering thereof are in electronegative potential, there is not breakdown danger.Separated exciting magnet controlled reactor is when grid collapses in addition, and the impact that the exciting current in iron core is subject to fault reduces greatly, can ensure the requirement to reactive power compensation when electric network fault.
Accompanying drawing explanation
Fig. 1 is single-phase separated exciting magnet controlled reactor structure.
Fig. 2 is the magnetic circuit figure of magnet controlled reactor.
Fig. 3 is the structure chart of three-phase separated exciting magnet controlled reactor.
Embodiment
According to circuit theory, the self-induction L of core type reactor is L=μ N
2a/ δ.Wherein, A is area of core section; μ is the magnetic permeability of ferromagnetic material; N is the number of turn of reactor winding; δ is the gas length of magnetic circuit.From above formula, the magnetic permeability of reactor inductance value and ferromagnetic material, umber of turn square and area of core section be directly proportional, be inversely proportional to the gas length of magnetic circuit.Change magnetic permeability μ unshakable in one's determination, namely change inductance value L, thus smooth adjustment System Reactive Power.
The magnetic permeability μ of ferromagnetic material is not constant, and when normally working, magnetic permeability reduces along with the degree of saturation increase of iron core, and the change of iron core cutter degree can realize by changing DC excitation electric current.Present invention employs the excitation mode of separated exciting, by special excitation unit, excitation is carried out to magnet controlled reactor exactly, single-phase separated exciting magnet controlled reactor structure as shown in Figure 1,220V AC power is connected with rectifying device by the thyristor of a pair reverse parallel connection and connection transformer, is obtained the DC excitation electric current needed by rectifying device.In a power frequency period, the thyristor conducting in turn of reverse parallel connection, by changing the size of the Trigger Angle of thyristor, just can change the size of alternating current in loop, and then changes the size of rectification side DC excitation electric current.
By the larger section of area, (length is l-l to magnetic valve type controllable reactor magnetic structure
t) and the less section of area (length is l
t) be composed in series.From principle Analysis before, magnetic valve type controllable reactor is within whole working range, the section that area is larger is in the unsaturated linear zone of ferromagnetic material magnetic characteristic all the time, very little that iron leg core that its magnetic resistance is less relative to area, therefore after ignoring the magnetic resistance of the unsaturated iron leg heart, magnetic valve type controllable reactor magnetic circuit system can be reduced to the form in accompanying drawing 2 (a), and the magnetic circuit of magnetic valve type controllable reactor presents " magnet valve " structure of image as seen from the figure.In real work, when area is A
btsmall bore core packet complete saturated time, magnetic valve closing can be thought, now calculate magnetic conductance minimum.Now the magnetic line of force equivalence can think that through area be A
b, length is l
tair-gap, as shown in accompanying drawing 2 (b).When area is A
btsmall bore core packet when being in unsaturation linear zone, can think that magnet valve door is opened completely, the magnetic line of force is almost complete to be passed through from iron core, now calculates magnetic conductance maximum, as shown in accompanying drawing 2 (c).When operating state between above between the two time, some magnetic line of force is passed through air-gap, another part magnetic line of force is by small bore core packet, the former magnetic resistance is linear, the magnetic resistance of the latter is still rendered as non-linear because core portion is saturated, and now the magnetic circuit of magnetic valve type controllable reactor is composed in parallel by two magnetic resistance.
Claims (3)
1. three-phase separated exciting magnet controlled reactor, is characterized in that, three-phase integratedization of magnet controlled reactor structure is combined with the excitation system of separated exciting, proposes a kind of novel magnet controlled reactor.
2. three-phase separated exciting magnet controlled reactor according to claim 1, is characterized in that, three single-phase magnet controlled reactors are integrated into a three-phase magnetron reactor.Existing single-phase magnet controlled reactor is single-phase three pillar type and single-phase four-column type two kinds mainly, and the three-phase magnetron reactor that the present invention proposes is three-phase six pillar, its role is to decrease return yoke branch road, decrease the use of core material, and then decrease floor space and manufacturing cost, thus practical more economically, application prospect is better.
3. three-phase separated exciting magnet controlled reactor according to claim 1, is characterized in that, have employed the excitation mode of separated exciting.Relative to self-excitation type excitation system, separated exciting excitation system have employed independently excitation system, and principle is simple, and stability is high, and be easy to control, and high-low pressure is completely isolated, thyristor and circuits for triggering thereof are in electronegative potential, there is not breakdown danger.Separated exciting magnet controlled reactor is when grid collapses in addition, and the impact that the exciting current in iron core is subject to fault reduces greatly, can ensure the requirement to reactive power compensation when electric network fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310226715.4A CN104240899A (en) | 2013-06-08 | 2013-06-08 | Novel three-phase separately excited magnetic control reactor |
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| CN201310226715.4A CN104240899A (en) | 2013-06-08 | 2013-06-08 | Novel three-phase separately excited magnetic control reactor |
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| CN104240899A true CN104240899A (en) | 2014-12-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865127A (en) * | 2021-03-22 | 2021-05-28 | 赵忠臣 | Dynamic reactive power compensation device |
| CN112992510A (en) * | 2021-03-22 | 2021-06-18 | 赵忠臣 | Self-excitation type three-phase three-column type electrically-controlled reactor |
-
2013
- 2013-06-08 CN CN201310226715.4A patent/CN104240899A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865127A (en) * | 2021-03-22 | 2021-05-28 | 赵忠臣 | Dynamic reactive power compensation device |
| CN112992510A (en) * | 2021-03-22 | 2021-06-18 | 赵忠臣 | Self-excitation type three-phase three-column type electrically-controlled reactor |
| CN112992510B (en) * | 2021-03-22 | 2023-08-29 | 赵忠臣 | Self-excitation type three-phase three-column type electric-regulation magnetic-control reactor |
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Application publication date: 20141224 |