CN203522599U - Iron core reactance regulator having power flow control function and short circuit current limiting function - Google Patents
Iron core reactance regulator having power flow control function and short circuit current limiting function Download PDFInfo
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- CN203522599U CN203522599U CN201320564723.5U CN201320564723U CN203522599U CN 203522599 U CN203522599 U CN 203522599U CN 201320564723 U CN201320564723 U CN 201320564723U CN 203522599 U CN203522599 U CN 203522599U
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Abstract
The utility model discloses an iron core reactance regulator having a power flow control function and a short circuit current limiting function. The iron core reactance regulator includes six square iron cores, a DC coil and AC coils. Each square iron core includes a middle post, a side post, an upper magnetic yoke and a lower magnetic yoke. A central post is formed by combining the six middle posts together. Distances between each two side posts are the same. The DC coil is coiled on the combined central post and is connected with an adjustable bias DC source. The AC coils are coiled on the side posts and dotted terminals of each two AC coils on the side posts that are opposite to each other are connected with each other and then connected to a power grid. The square iron cores are provided with air gaps. The iron core reactance regulator provided by the utility model is simple in structure, easy to realize, low in cost and high in reliability.
Description
Technical field
The utility model relates to flexible power transmission and transformation device, especially a kind of iron core reactance regulator.
Background technology
It is problem of greatest concern in power system operation that the trend of modern power network is controlled always, for large electrical network, if its trend can not get effective control, will produce significant impact to electric power netting safe running.But comprehensively trend is controlled the device that needs large amount of complex costliness, this rises operation of power networks cost.Simultaneously, increase due to electric power system capacity, short circuit current is also increasing, not only cause circuit breaker to disconnect, also to electrical network, bring huge transient short-circuit current to impact, existing solution is included in and reactor, fault current limiter, increasing transformer reactance is set on electrical network or changes transmission line operational mode etc.
In modern power network, series reactor can be by regulating the reactance of self to adjust the trend on power transmission network; Some special occasions also carry out regulating system trend with the dry reactor with constant reactance value; The series compensation equipment that simultaneously electronic power switch device forms is also usually used for flexible system impedance.Also have a kind of saturable core that uses as the reactor of primary structure, utilize superconducting line to form control circuit, saturable core and superconducting coil are combined to realize fault current limitation function, often claim this class device to be called saturable core type superconductive current limiter.Yet dry reactor often lacks flexibility in trend is controlled; The series compensation device that power electronic device forms has complicated control mode and a large amount of expensive switching device conventionally, causes cost increase and usage policy complicated; Saturable core flow restricter often only has failure current limit function, and cannot when electrical network normally moves, arrange flexibly direct impedance to adapt to the requirement of electric power system tide.This saturable core superconductive current limiter only has two-value output: while showing low reactance and electric network fault when electrical network is normal, show high reactance, thereby do not have trend control ability.Saturable core flow restricter seals in reactance minimum when forcing electrical network normally to move, need great DC excitation system to control iron core in degree of depth saturation condition, in this class saturable core flow restricter, the normal superconductor that adopts is as DC coil loop, also must the come into operation normal work of guarantee superconductor of corresponding refrigeration plant, therefore device volume and the equipment investment of saturable core superconductive current limiter are all huge, and economy is relatively low.
Utility model content
Utility model object a: object of the present utility model is that a kind of iron core reactance regulator with trend control and short-circuit current-limiting function will be provided, though there is damp flow control function and but do not there is failure current limit function in order to solve dry reactor and power electronics series compensation device, though and saturable core superconductive current limiter has the technical problem that failure current limit function does not have damp flow control function.
Technical scheme: a kind of iron core reactance regulator with trend control and short-circuit current-limiting function, comprises 6 port type iron cores, DC coil and AC coil; Each port type iron core comprises intermediolateral column, side column, upper magnet yoke and lower yoke, and 6 intermediolateral columns are combined and form combination intermediolateral column, and the distance of adjacent side column all equates; DC coil is wound on described combination intermediolateral column and with adjustable bias DC source and is connected, and described AC coil is wound on side column, and the Same Name of Ends of two AC coil on side column is connected on electrical network after being connected relatively; Described port type iron core is provided with air gap.
Described in the turn ratio of described AC coil coiling, the number of turn of DC coil is few.Described air gap is arranged on side column, upper magnet yoke or lower yoke.
An iron core reactance regulator with trend control and short-circuit current-limiting function, comprises 2 port type iron cores, DC coil and AC coil; Each port type iron core comprises intermediolateral column, side column, upper magnet yoke and lower yoke, and described intermediolateral column is combined and forms combination intermediolateral column; Described DC coil is also connected with adjustable bias DC source on combination intermediolateral column, and AC coil is wound on described side column, and the Same Name of Ends of AC coil is connected on electrical network after being connected, and described upper magnet yoke is provided with air gap.Described in the turn ratio of described AC coil coiling, the number of turn of DC coil is few.
Beneficial effect: the utility model does not need to use superconductor, simple in structure, is easy to realize, and cost is low, and reliability is high.
Accompanying drawing explanation
Fig. 1 is the utility model three-phase structure end view;
Fig. 2 a is that the utility model often intersects the mode of connection of DC coil and the schematic diagram that air gap is arranged on upper magnet yoke;
Fig. 2 b is that the utility model often intersects the mode of connection of DC coil and the schematic diagram that air gap is arranged on lower yoke;
Fig. 2 c is that the utility model often intersects the mode of connection of DC coil and the schematic diagram that air gap is arranged on upper and lower yoke;
Fig. 2 d is that the utility model often intersects the mode of connection schematic diagram of DC coil and the schematic diagram that air gap is arranged on other post;
The schematic diagram of Fig. 2 e the utility model air gap;
Fig. 3 is the vertical view of the utility model three-phase structure and the schematic diagram of opening gap position thereof;
Fig. 4 is vertical view of the present utility model;
Fig. 5 is upward view of the present utility model;
Fig. 6 is the magnetization curve control principle drawing of the utility model when trend is controlled;
Fig. 7 is the magnetization curve control principle drawing of the utility model when failure current limit;
Fig. 8 is the situation of change that fundamental reactance is exported in the adjustment of the utility model direct current afterwards, is to take the emulation experiment figure that alternating current 220V grade model machine does as example;
Emulation experiment figure when Fig. 9 is the utility model current limliting, and be that short circuit current contrasts with not connecing iron core reactance regulator is to take the emulation experiment figure that alternating current 220V grade model machine does as example.
Embodiment
Below in conjunction with accompanying drawing, illustrate embodiment of the present utility model:
Iron core reactance regulator of the present utility model comprises 2 kinds: for phase structure, 2 port type iron cores are set, each port type iron core has a middle iron core column, side column, upper magnet yoke and a lower yoke, and top yoke has been opened the air gap of specific size.In phase structure, the intermediolateral column of two port type iron cores is combined and forms combination intermediolateral column, DC coil is also connected with adjustable bias DC source on combination intermediolateral column, and adjustable bias DC source can change the output fundamental reactance of the saturation change iron core reactance adjusting device of iron core as required.On the side column of two port type iron cores, be all wound with AC coil, after two AC coil Same Name of Ends are connected, be serially connected on electrical network again.
For three-phase structure, 6 port type iron cores are set, three-phase structure is comprised of 6 port type iron cores, 6 port type iron cores form 360 ° of circle configurations around combination intermediolateral column, every two around combination center pillar, to be the hollow structure of 180 ° be a phase, on these two port type iron core side columns, be wound with respectively the coil that belongs to same phase, and the correspondence that is connected on electrical network after two coil Same Name of Ends series connection is gone up mutually.DC coil is wound on combination center pillar and is connected with adjustable bias DC source.The number of turn of DC coil is more, conventionally can be set to hundreds of circle; On every phase side column, the AC coil number of turn is less, conventionally can be set to tens circles, and on every phase side column, the AC coil number of turn is identical.
In the utility model, adjustable bias DC source is generally comprised of power electronic device, during stable state, by the conducting of accurate control switch device, turn-offs to regulate DC coil electric current to command value, and then changes the output fundamental reactance of iron core reactance regulator.And because core structure has air gap, make the linearity of magnetization curve good, the adjustable range of output reactance is wide, the harmonic wave that whole device is introduced electrical network is little.After fault occurs, adjustable bias DC source can reduce to zero by output DC current values rapidly, and the output reactance of iron core reactance regulator is increased rapidly, and while realizing grid short circuit, quick feeding device enters limited current state.
In conjunction with Fig. 1 to Fig. 5, the utility model is described.Fig. 1 is end view of the present utility model, and centre is wound with DC coil, and the AC coil on the adjustable bias DC source that DC coil connects and 6 side columns does not draw.A cross streams coil winding is on iron core column 1-1 and iron core column 1-2; B cross streams coil winding is on iron core column 1-3 and iron core column 1-4; C cross streams coil winding, on iron core column 1-5 and iron core column 1-6, is connected on electrical network after two AC coil Same Name of Ends of every phase join.
As Fig. 2 a～Fig. 2 d is depicted as a phase structure of iron core reactance regulator, the air gap of iron core reactance regulator can be arranged on upper magnet yoke (as Fig. 2 a), on lower yoke (as Fig. 2 b), upper lower yoke (as Fig. 2 c) or other post (as Fig. 2 d).Fig. 2 e is the structure chart of air gap, and in manufacturing by reasonable adjustment iron core c, the width L of air gap, as Fig. 2 e, can make the iron core reactance regulator shown in Fig. 2 a～Fig. 2 d obtain identical operating characteristic.
As shown in Fig. 2 a～Fig. 2 d, the Same Name of Ends of the AC coil 2-1 of every phase and AC coil 2-2 is connected with electrical network 2-5 after being connected again.Note in three-phase structure, it is upper that DC coil is wound on combination intermediolateral column 1-7, is serially connected with equally adjustable DC source 2-4 on DC coil 2-3.Air gap setting position in one phase reactance regulator model is with reference to Fig. 2 a～Fig. 2 d.As shown in Figure 4, the concrete arrangement mode of alternating current-direct current coil is as follows: A phase coil is composed in series by coil 4-1 and coil 4-2 Same Name of Ends, B phase coil is composed in series by coil 4-3 and coil 4-4 Same Name of Ends, C phase coil is composed in series by coil 4-5 and coil 4-6 Same Name of Ends, is also shown in the figure DC coil 4-7.
From Fig. 1 and 3, can find out: Ben Teding three-phase installation is comprised of six port type iron cores, and each port type iron core upper magnet yoke has air gap, for example air gap 3-7,3-8,3-9,3-10,3-11 and 3-12.Port type iron core lower yoke, intermediolateral column and side column all do not open air gap (similarly this three-phase installation also can choose reasonable lower yoke, on lower yoke or side column open air gap, by width of air gap L is rationally set, can make each tri-phase iron core adjuster of different air gap position present same working effect).
The control method of tri-phase iron core reactance regulator is consistent with single-phase iron core reactance regulator, below in conjunction with magnetization curve operation principle Fig. 6 and Fig. 7, tri-phase iron core reactance regulator operating characteristic is analyzed.
When electrical network can, according to the needs of electric network swim, regulate the adjustable bias DC source 2-4 electric current at DC coil 2-3 place to arrive command value idc during in steady operation state.The amplitude of each phase running current while moving due to power system stability (comprises negative sense alternating current amplitude i
m-with forward alternating current amplitude i
m+) I
mchange less, in the particular range of the magnetization curve of reactance regulator in arc AB place.Fig. 6 has described magnetization curve operation principle when trend is controlled: because iron core has air gap, the magnetization curve linearity is better, can be the approximate straightway of regarding as between arc AB location
.The outputting inductance of iron core reactance regulator (other post coil inductance) exists
in interval, can think constant, L=tan α, now has output reactance X
out=ω L is constant.By controlling the DC control electric current I of adjustable bias DC source 2-4
dccan control the working point of iron core, iron core magnetic permeability is changed, and then the output reactance X of adjusting device
out, to reach the object that changes as required power network line electric current.
Fig. 8 is under alternating current 220V grade, the analogous diagram of the three-phase installation A phase output reactance that the Fig. 1 of take is model and the current relationship of adjustable bias DC source 2-4.Device B phase is mutually identical with A with the current relationship situation of adjustable bias DC source 2-4 with the output reactance of C phase, does not draw here.Because this iron core reactance regulator iron core has air gap, the linearity of magnetization curve is good, therefore very little to the harmonic pollution of electrical network, has practical value.Under adjustable bias DC source 2-4 output direct current and alternating current 220V electrical network, the relation of line current and harmonic constant can see the following form, and this table is that the iron core reactance regulator of 220V grade is connected on to the simulation experiment result on alternating current 220V electrical network.(internal resistance of source is disregarded for every phase load 20 Ω of electrical network, every phase system reactance 0.6 Ω)
Can find out that this device harmonic pollution to electrical network in steady-state load flow adjustment process is very little.Along with the increase of DC control electric current, power network current can improve thereupon, and device output reactance decreases, and electric power system tide can obtain corresponding change as required.
During failure current limit, the iron core magnetization curve operation principle of iron core reactance regulator is as Fig. 7: when circuit is short-circuited fault, amplitude of short circuit is If
m.If
mmore much larger than steady operation electric current, the output current of at this moment controlling adjustable bias DC source 2-4 is dropped rapidly to zero, and iron core magnetization curve working point becomes initial point O at once, and iron core reactance adjuster enters current limliting operating state.Because iron core has air gap, even if amplitude of short circuit is very large, also can guarantee that the iron core most of the time is operated in the OA section of the range of linearity, this timer is exported average reactance and can be thought
, L2 is other post coil equivalent inductance.
Magnetization curve working condition when Fig. 7 has only shown short circuit current positive half wave, the situation of the negative half-wave of short circuit current, with symmetrical, repeats no more.Fig. 9 has described take the tri-phase iron core reactance regulator that Fig. 1 is model and is connected under alternating current 220V electrical network, and the current limliting situation (every phase load 20 Ω of electrical network, every phase system reactance 0.6 Ω) after single-phase short circuit occurs A when 0.022s.Can find out by iron core reactance regulator by the short-circuit current limitation after fault 60% left and right before being unkitted this device, visible the utility model iron core reactance regulator has good failure current limit effect.
As can be seen from the above analysis, the utility model has good power system mesomeric state tide flow control function and short-circuit fault of power system current-limiting function concurrently simultaneously.
Above content shows and has described basic principle of the present utility model and principal character and advantage.The technical staff of the industry should understand the utility model and not be restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. an iron core reactance regulator with trend control and short-circuit current-limiting function, is characterized in that, comprises 6 port type iron cores, DC coil and AC coil; Each port type iron core comprises intermediolateral column, side column, upper magnet yoke and lower yoke, and 6 intermediolateral columns are combined and form combination intermediolateral column, and the distance of adjacent side column all equates; DC coil is wound on described combination intermediolateral column and with adjustable bias DC source and is connected, and described AC coil is wound on side column, and the Same Name of Ends of two AC coil on side column is connected on electrical network after being connected relatively; Described port type iron core is provided with air gap.
2. as claimed in claim 1 have that trend is controlled and the iron core reactance regulator of short-circuit current-limiting function, it is characterized in that, the number of turn of DC coil is few described in the turn ratio of described AC coil coiling.
3. the iron core reactance regulator with trend control and short-circuit current-limiting function as claimed in claim 1, is characterized in that, described air gap is arranged in side column, upper magnet yoke or lower yoke.
4. an iron core reactance regulator with trend control and short-circuit current-limiting function, is characterized in that, comprises 2 port type iron cores, DC coil and AC coil; Each port type iron core comprises intermediolateral column, side column, upper magnet yoke and lower yoke, and described intermediolateral column is combined and forms combination intermediolateral column; Described DC coil is also connected with adjustable bias DC source on combination intermediolateral column, and AC coil is wound on described side column, and the Same Name of Ends of AC coil is connected on electrical network after being connected, and described upper magnet yoke is provided with air gap.
5. as claimed in claim 4 have that trend is controlled and the iron core reactance regulator of short-circuit current-limiting function, it is characterized in that, the number of turn of DC coil is few described in the turn ratio of described AC coil coiling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320564723.5U CN203522599U (en) | 2013-09-11 | 2013-09-11 | Iron core reactance regulator having power flow control function and short circuit current limiting function |
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| CN201320564723.5U CN203522599U (en) | 2013-09-11 | 2013-09-11 | Iron core reactance regulator having power flow control function and short circuit current limiting function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475293A (en) * | 2013-09-11 | 2013-12-25 | 东南大学 | Iron core reactance regulator with current control and short-circuit current-limiting functions and control method thereof |
| CN109655677A (en) * | 2017-10-10 | 2019-04-19 | 特变电工衡阳变压器有限公司 | Current-limiting reactor multifunction test device, test method and manufacturing method |
| CN110364332A (en) * | 2018-04-09 | 2019-10-22 | 发那科株式会社 | Polyphase transformer |
-
2013
- 2013-09-11 CN CN201320564723.5U patent/CN203522599U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475293A (en) * | 2013-09-11 | 2013-12-25 | 东南大学 | Iron core reactance regulator with current control and short-circuit current-limiting functions and control method thereof |
| CN109655677A (en) * | 2017-10-10 | 2019-04-19 | 特变电工衡阳变压器有限公司 | Current-limiting reactor multifunction test device, test method and manufacturing method |
| CN109655677B (en) * | 2017-10-10 | 2021-09-03 | 特变电工衡阳变压器有限公司 | Multifunctional test device, test method and manufacturing method of current-limiting reactor |
| CN110364332A (en) * | 2018-04-09 | 2019-10-22 | 发那科株式会社 | Polyphase transformer |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20180911 |
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| CF01 | Termination of patent right due to non-payment of annual fee |