CN110517869A - The circuit topology and control method of flexible adjustable transformer neutral point ground connection - Google Patents
The circuit topology and control method of flexible adjustable transformer neutral point ground connection Download PDFInfo
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- CN110517869A CN110517869A CN201910627085.9A CN201910627085A CN110517869A CN 110517869 A CN110517869 A CN 110517869A CN 201910627085 A CN201910627085 A CN 201910627085A CN 110517869 A CN110517869 A CN 110517869A
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2895—Windings disposed upon ring cores
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
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Abstract
Disclose the circuit topology and control method of flexible adjustable transformer neutral point ground connection, in circuit topology, positive winding is connected with reversed windings in series, reversed winding is in parallel with control switch, by adjusting the different angles of flow of the control switch in power frequency period, when all phase turns off control switch in power frequency period, positive winding is to closed magnetic core forward direction excitation, and reversely for winding to the reversed excitation of closed magnetic core, the impedance of inductor is approximately zero；When control switch in power frequency period open by all phase, only positive winding is to closed magnetic core forward direction excitation, and reversed winding is not put into, at this point, the impedance of inductor is very big；When conduction phase of the control switch in power frequency period continuously adjusts, that is, it can control reversed winding to the degree of the reversed excitation of closed magnetic core, to realize that the flexibility of inductor impedance is continuously adjustable.
Description
Technical field
The present invention relates to transformer technology field, the circuit of especially a kind of adjustable transformer neutral point ground connection of flexibility is opened up
It flutters and control method.
Background technique
Grounding mode of transformer neutral-point has direct influence to the security reliability of power grid and economy, meanwhile, also can
Directly affect selection, overvoltage level, the means of relay protection, the communication interference etc. of power system device dielectric level.Currently, becoming
Depressor neutral grounding mode is broadly divided into two major classes, i.e. direct grounding way (heavy current grounding system) and through impedance earth side
Formula (small current neutral grounding system).Under direct grounding way, internal overvoltage is low, localization of fault is easy, but its failure removal
Line discontinuities are caused to be powered, power supply reliability is low, and earth current is big, big to the interference of control system.Through impedance earth mode
Under, the electric current of singlephase earth fault is small, and partial fault can be removed automatically, and without tripping, still, overvoltage is higher, insulation
Pressure is big, and fault location is more difficult.
It can be seen that the impedance ground of transformer neutral point directly determines that fault current, overvoltage level, fault point are fixed
Position accuracy etc..A kind of adjustable impedance of flexibility is needed, for transformer earth neutral system passes through the quick of different impedances
It adjusts and switching is realized big to realize various balances such as fault current, overvoltage level, localization of fault accuracy
Current grounding system and small current neutral grounding system advantage are taken into account.
Above- mentioned information disclosed in background technology part are used only for enhancing the understanding to background of the present invention, it is thus possible to wrap
Containing the information for not constituting the prior art known to a person of ordinary skill in the art.
Summary of the invention
In view of the above problems, it is provided a kind of soft the purpose of the invention is to overcome the problems of the above-mentioned prior art
Property adjustable transformer neutral point ground connection circuit topology and control method, realize that the flexibility of inductor impedance is continuously adjustable.
The purpose of the present invention is be achieved by the following technical programs.
A kind of circuit topology of the adjustable transformer neutral point ground connection of flexibility comprising be located at transformer neutral point and ground
Between inductor, the inductor includes,
Closed magnetic core,
Positive winding is wound on the side of the closed magnetic core,
Reversed winding is wound on the other side of the closed magnetic core, wherein positive winding is connected with reversed winding parallel
And equal turn numbers around on the contrary,
The reversed winding is connected in series, when conduction phase of the control switch in power frequency period is continuous in control switch
When adjusting, controls reversed winding and the degree of the reversed excitation of closed magnetic core is continuously adjusted with the flexibility for realizing inductor impedance,
Wherein, when control switch in power frequency period open by all phase, positive winding is to closed magnetic core forward direction excitation, and reversed winding
To the reversed excitation of closed magnetic core, so that the impedance of inductor is approximately zero；When all phase turns off control switch in power frequency period
When, only positive winding is to closed magnetic core forward direction excitation, and reversed winding is not put into reach the impedance maximum value of inductor.
In the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, positive winding and reversed winding are series connection
Structure, when the current amplitude in positive winding and reversed winding is equal, the excitation of the two is cancelled out each other；When in positive winding
Electric current is flowed through when electric current is zero in reversed winding, and the sum of impedance of the two is in maximum value；When flowing through electric current in positive winding
When for I+, electric current is I- in reversed winding, reversed winding, which exists, to be shunted, I+ is greater than I-, and the sum of impedance of the two is between maximum
Between value and 0.
In the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, described the number of turns and closed magnetic core sectional area
Matching is not so that closed magnetic core generates magnetic saturation under maximum current.
In the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, control switch and reversed winding parallel connect
It connects to control reversed winding shunts.
In the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the control switch includes two-way controllable
Silicon device, the angle of flow by adjusting bidirectional triode thyristor device change the duty ratio of time of reversed winding circulating current to realize just
It is continuously adjustable to the flexibility of winding and reversed winding total impedance.
In the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the control switch includes cascade double
To silicon-controlled device, the highest overvoltage of transformer neutral point is Umax, and the highest withstanding voltage of bidirectional triode thyristor device is
Us, the quantity N of bidirectional triode thyristor device are as follows:
Wherein, η is safety coefficient, takes 0.5-0.7；N round numbers.
In the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, as the quantity N of bidirectional triode thyristor device
When more than 3, the quantity by changing bidirectional triode thyristor investment changes the number of turns of reversed winding investment to obtain positive winding and anti-
Classification to winding total impedance is adjustable.
In the circuit topology of the described adjustable transformer neutral point ground connection of flexibility, the inductor include based on balance around
The flexible REgulatable reactor of group.
In the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the neutral point highest overvoltage of transformer
For 15kV, closed magnetic core material is non-crystalline material, and core cross section product is 50cm2, bidirectional triode thyristor device is 8.5kV-1000A brilliant
Brake tube, the quantity of bidirectional triode thyristor are preferably 4, and the number of turns of positive winding is 40 circles, and reversed winding is divided into 4 sections, every section of 10 circles and
Every section in parallel with a bidirectional triode thyristor device.
According to another aspect of the present invention, the control of the circuit topology of the adjustable transformer neutral point ground connection of a kind of flexibility
Method processed includes the following steps,
First step, inductor arrangement between transformer neutral point and ground,
Second step, positive winding to closed magnetic core forward direction excitation, reversed winding to the reversed excitation of closed magnetic core,
Third step, conduction phase of the control switch in power frequency period continuously adjust, and control reversed winding to closed magnetic
The degree of the reversed excitation of core is continuously adjustable with the flexibility for realizing inductor impedance, wherein when control switch is in power frequency period
When all phase is opened, positive winding is to closed magnetic core forward direction excitation, and reversely winding is to the reversed excitation of closed magnetic core, so that inductance
The impedance of device is approximately zero；When all phase turns off control switch in power frequency period, only positive winding to closed magnetic core just
To excitation, and reversed winding is not put into reach the impedance maximum value of inductor.
Compared with prior art, the beneficial effects of the present invention are:
A set of inductor is arranged in the present invention between transformer neutral point and ground, and inductor is using the technical side for balancing winding
Case, including closed magnetic core, positive winding, reversed winding and control switch, change winding to closed magnetic core by control switch
Excitation situation realizes the flexible modulation of transformer neutral point impedance ground to realize that the continuous flexible of inductor impedance is adjustable.
The above description is only an overview of the technical scheme of the present invention, in order to make technological means of the invention clearer
Understand, reach the degree that those skilled in the art can be implemented in accordance with the contents of the specification, and in order to allow the present invention
Above and other objects, features and advantages can be more clearly understood, illustrated below with a specific embodiment of the invention
Explanation.
Detailed description of the invention
By reading the detailed description in hereafter preferred embodiment, various other advantages and benefits of the present invention
It will become apparent to those of ordinary skill in the art.Figure of description only for the purpose of illustrating preferred embodiments,
And it is not to be construed as limiting the invention.It should be evident that drawings discussed below is only some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.And throughout the drawings, identical component is presented with like reference characters.
In the accompanying drawings:
Fig. 1 is the structure of the circuit topology of the adjustable transformer neutral point ground connection of flexibility according to an embodiment of the invention
Schematic diagram；
Fig. 2 is the step schematic diagram of control method according to an embodiment of the invention.
Below in conjunction with drawings and examples, the present invention will be further explained.
Specific embodiment
The specific embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although being shown in attached drawing of the invention
Specific embodiment, it being understood, however, that may be realized in various forms the present invention without that should be limited by embodiments set forth here
System.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be complete by the scope of the present invention
Be communicated to those skilled in the art.
It should be noted that having used some vocabulary in the specification and claims to censure specific components.Ability
Field technique personnel it would be appreciated that, technical staff may call the same component with different nouns.This specification and right
It is required that not in such a way that the difference of noun is as component is distinguished, but with the difference of component functionally as differentiation
Criterion."comprising" or " comprising " as mentioned throughout the specification and claims are an open language, therefore should be solved
It is interpreted into " including but not limited to ".Specification subsequent descriptions are to implement better embodiment of the invention, so the description be with
For the purpose of the rule of specification, the range that is not intended to limit the invention.Protection scope of the present invention is when the appended right of view
It is required that subject to institute's defender.
In order to facilitate understanding of embodiments of the present invention, further by taking specific embodiment as an example below in conjunction with attached drawing to be solved
Explanation is released, and each attached drawing does not constitute the restriction to the embodiment of the present invention.
In order to better understand, as shown in Figure 1, a kind of circuit topology of flexibility adjustable transformer neutral point ground connection,
Including the inductor being located between transformer neutral point and ground, the inductor includes,
Closed magnetic core 1,
Positive winding 2 is wound on the side of the closed magnetic core 1,
Reversed winding 3, is wound on the other side of the closed magnetic core 1, wherein positive winding 2 and reversed winding 3 are in parallel
Connection and equal turn numbers around on the contrary,
The reversed winding 3 is connected in series in control switch 4, when conduction phase of the control switch 4 in power frequency period connects
When continuous adjusting, controls reversed winding 3 and continuously may be used to the degree of the reversed excitation of closed magnetic core 1 with the flexibility for realizing inductor impedance
It adjusts, wherein when control switch 4 in power frequency period open by all phase, positive winding 2 is and anti-to the positive excitation of closed magnetic core 1
To winding 3 to the reversed excitation of closed magnetic core 1, so that the impedance of inductor is approximately zero；When control switch 4 is complete in power frequency period
When phase turns off, only positive winding 2 is to the positive excitation of closed magnetic core 1, and reversed winding 3 is not put into reach the resistance of inductor
Anti- maximum value.
For a further understanding of the present invention, in one embodiment, it is assumed that the neutral point of certain distribution transformer is likely to occur
Highest overvoltage be 15kV.1 material of closed magnetic core is preferably non-crystalline material, and core cross section product is preferably 50cm2.It is two-way controllable
Silicon device is preferably 8.5kV-1000A thyristor.According to the highest overvoltage of neutral point, the quantity of bidirectional triode thyristor is preferably 4.
The number of turns of positive winding 2 is preferably 40 circles, and it is 4 sections that reversed winding 3, which divides, every section of 10 circles and every section and a bidirectional triode thyristor device
It is in parallel.
When transformer neutral point needs high current to be grounded, four bidirectional triode thyristor devices all phase in power frequency period is closed
It is disconnected, at this point, the excitation direction of positive winding 2 and reversed winding 3 is on the contrary, its total impedance is microhenry magnitude；Work as transformer neutral point
When needing small current neutral grounding, four bidirectional triode thyristor devices all phase in power frequency period is closed, at this point, positive winding 2 is to closing
It closes magnetic core 1 and generates positive excitation, and reversed winding 3 is short-circuited, and does not generate reversed excitation, at this point, its total impedance is more than 10mH.
Compared with conventional grounding mode of transformer neutral-point, the adjustable transformer neutral point of flexibility proposed by the invention
A set of inductor is arranged in the circuit topology of earthing mode between transformer neutral point and ground, and inductor is using balance winding
Technical solution, including closed magnetic core 1, positive winding 2, reversed winding 3 and control switch 4, change winding pair by control switch 4
The excitation situation of closed magnetic core 1 realizes transformer neutral point impedance ground to realize that the continuous flexible of inductor impedance is adjustable
Flexible modulation from microhenry magnitude to 10mH.
In the circuit topology of the adjustable transformer neutral point ground connection of flexibility provided by the invention.In transformer neutral point and ground
Between a set of inductor is set, inductor using balance winding technical solution, including it is closed magnetic core 1, positive winding 2, reversed
Winding 3 and control switch 4.Wherein, positive winding 2 and reversed winding 3 are connected in parallel, the equal turn numbers of the two, but around to opposite.
Wherein, reversed winding 3 is connected with control switch 4, by adjusting the different angles of flow of the control switch 4 in power frequency period
Adjust the duty ratio of time that reversed winding 3 is put into.When control switch 4 in power frequency period open by all phase, positive winding 2 is right
The positive excitation of closed magnetic core 1, and reversely winding 3 is to the reversed excitation of closed magnetic core 1, at this point, the impedance of inductor is approximately zero；When
Control switch 4 is when all phase turns off in power frequency period, and only positive winding 2 is to the positive excitation of closed magnetic core 1, and reversed winding
3 do not put into, at this point, the impedance of inductor is very big；When conduction phase of the control switch 4 in power frequency period continuously adjusts, i.e.,
It can control reversed winding 3 to the degree of the reversed excitation of closed magnetic core 1, to realize that the flexibility of inductor impedance is continuously adjustable.
Further, positive winding 2 and reversed winding 3 are wound on the two sides of closed magnetic core 1, and positive winding 2 respectively
With the equal turn numbers of reversed winding 3, around to opposite.And umber of turn and 1 sectional area of closed magnetic core should ensure that magnetic under maximum current
There is not magnetic saturation phenomenon in core.
Further, positive winding 2 and reversed winding 3 use concatenated structure, and positive winding 2 produces closed magnetic core 1
Raw forward direction excitation, and reversed winding 3 generates reversed excitation to closed magnetic core 1.Electric current in positive winding 2 and reversed winding 3
When amplitude is equal, the excitation of the two is cancelled out each other, at this point, the sum of impedance of the two very little；When flowing through electric current in positive winding 2 and
When electric current is zero in reversed winding 3, only positive winding 2 generates excitation to closed magnetic core 1, at this point, the sum of impedance of the two is most
Greatly；It is I when flowing through electric current in positive winding 2+And electric current is I in reversed winding 3-When (reversed winding 3 has shunting, at this point, I+>
I-), the reversed excitation of the reversed comparison of winding 3 and magnetic core is only capable of offsetting a part of positive excitation, at this point, the sum of impedance of the two is situated between
Between maximum value and minimum value.
Further, reversed winding 3 is connected in parallel with control switch 4, adjusts reversed winding 3 by control switch 4
Tapping condition.
Further, control switch 4 uses bidirectional triode thyristor device, facilitates triggering, and can cascade and be used to ensure that
Enough withstanding voltage abilities.
Further, the cascade quantity of bidirectional triode thyristor device is neutral according to its device withstanding voltage ability and transformer
The highest overvoltage that point is likely to occur codetermines.Assuming that the highest overvoltage that transformer neutral point is likely to occur is Umax, and it is double
It is U to the highest withstanding voltage of silicon-controlled devices, at this point, the quantity N choosing method of bidirectional triode thyristor device is as follows:
Wherein, η is safety coefficient, takes 0.5~0.7；N round numbers.
It further, can be by two kinds not in order to adjust the tapping condition of reversed winding 3 by bidirectional triode thyristor device
Same mode is adjusted.It is possible, firstly, to be flowed by the angle of flow for adjusting bidirectional triode thyristor device to change reversed winding 3
Alive duty ratio of time, to realize that the flexibility of 3 total impedance of positive winding 2 and reversed winding is continuously adjustable；Secondly, when double
When being more than 3 to the quantity N of silicon-controlled device, the quantity that can be put by changing bidirectional triode thyristor, to change reversed winding 3
The number of turns of investment obtains positive winding 2 and reversed to realize adjusting of the reversed winding 3 to the reversed excitation degree of closed magnetic core 1
The classification of 3 total impedance of winding is adjustable.
Further, the angle of flow for controlling bidirectional triode thyristor and the input quantity two ways for changing bidirectional triode thyristor can
To be used in combination, thus realize positive winding 2 and 3 total impedance of reversed winding (i.e. transformer neutral point connects Low ESR) it is flexible,
Flexibility is continuously adjustable.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, positive 2 He of winding
Reversed winding 3 is concatenated structure, and when positive winding 2 is equal with the current amplitude in reversed winding 3, the excitation of the two is mutual
It offsets；When flowing through electric current in positive winding 2 and electric current is zero in reversed winding 3, the sum of impedance of the two is in maximum value；When
Flowing through that electric current is I+ in positive winding 2 when electric current is 1- in reversed winding 3, reversed winding 3, which exists, to be shunted, I+ is greater than 1-, and two
The sum of impedance of person is between maximum value and 0.
In the preferred embodiment of the circuit topology of the described adjustable transformer neutral point ground connection of flexibility, described the number of turns and close
The matching of 1 sectional area of magnetic core is closed so that closed magnetic core 1 does not generate magnetic saturation under maximum current.
In the preferred embodiment of the circuit topology of the described adjustable transformer neutral point ground connection of flexibility, control switch 4 with
Reversed winding 3 is connected in parallel to control reversed winding 3 and shunt.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the control switch
4 include bidirectional triode thyristor device, and the angle of flow by adjusting bidirectional triode thyristor device changes the time of reversed 3 circulating current of winding
Duty ratio is continuously adjustable with the flexibility for realizing 3 total impedance of positive winding 2 and reversed winding.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the control switch
4 include cascade bidirectional triode thyristor device, and the highest overvoltage of transformer neutral point is Umax, and bidirectional triode thyristor device is most
High withstanding voltage is Us, the quantity N of bidirectional triode thyristor device are as follows:
Wherein, η is safety coefficient, takes 0.5-0.7；N round numbers.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, work as bidirectional triode thyristor
When the quantity N of device is more than 3, the quantity by changing bidirectional triode thyristor investment changes the number of turns of the reversed investment of winding 3 to obtain
The classification of 3 total impedance of positive winding 2 and reversed winding is adjustable.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the inductor packet
Include the flexible REgulatable reactor based on balance winding.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the neutrality of transformer
Point highest overvoltage is 15kV, and 1 material of closed magnetic core is non-crystalline material, and core cross section product is 50cm2, bidirectional triode thyristor device is
8.5kV-1000A thyristor, the quantity of bidirectional triode thyristor are preferably 4, and the number of turns of positive winding 2 is 40 circles, and reversed winding 3, which divides, is
4 sections, every section of 10 circles and every section it is in parallel with a bidirectional triode thyristor device.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the forward direction winding
2 include terminals 5, and terminals 5 are connected with transformer neutral point, and reversed winding 3 is grounded.
In the preferred embodiment of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility, the other side is
The opposite side of the side.
As shown in Fig. 2, a kind of control method of the circuit topology of the adjustable transformer neutral point ground connection of the flexibility includes
Following steps,
First step S1, inductor arrangement between transformer neutral point and ground,
Second step S2, positive winding 2 to the positive excitation of closed magnetic core 1, reversed winding 3 to the reversed excitation of closed magnetic core 1,
Third step S3, conduction phase of the control switch 4 in power frequency period continuously adjust, and control reversed winding 3 to closing
The degree of the reversed excitation of magnetic core 1 is closed to realize that the flexibility of inductor impedance is continuously adjustable, wherein when control switch 4 is in power frequency
When all phase is opened in period, positive winding 2 is to the positive excitation of closed magnetic core 1, and reversed winding 3 reversely encourages closed magnetic core 1
Magnetic, so that the impedance of inductor is approximately zero；When all phase turns off control switch 4 in power frequency period, only positive winding 2
To the positive excitation of closed magnetic core 1, and reversed winding 3 is not put into reach the impedance maximum value of inductor.
Industrial applicibility
The circuit topology and control method of the adjustable transformer neutral point ground connection of flexibility of the present invention can be in transformations
Device field manufactures and uses.
The basic principle of the application is described in conjunction with specific embodiments above, however, it is desirable to, it is noted that in this application
The advantages of referring to, advantage, effect etc. are only exemplary rather than limitation, must not believe that these advantages, advantage, effect etc. are the application
Each embodiment is prerequisite.In addition, detail disclosed above is merely to exemplary effect and the work being easy to understand
With, rather than limit, it is that must be realized using above-mentioned concrete details that above-mentioned details, which is not intended to limit the application,.
In order to which purpose of illustration and description has been presented for above description.In addition, this description is not intended to the reality of the application
It applies example and is restricted to form disclosed herein.Although already discussed above multiple exemplary aspects and embodiment, this field skill
Its certain modifications, modification, change, addition and sub-portfolio will be recognized in art personnel.
Claims (10)
1. a kind of circuit topology of the adjustable transformer neutral point ground connection of flexibility comprising be located between transformer neutral point and ground
Inductor, the inductor includes,
Closed magnetic core,
Positive winding is wound on the side of the closed magnetic core,
Reversed winding is wound on the other side of the closed magnetic core, wherein positive winding is connected with reversed winding parallel and circle
Number it is equal around on the contrary,
The reversed winding is connected in series, when conduction phase of the control switch in power frequency period continuously adjusts in control switch
When, reversed winding is controlled to the degree of the reversed excitation of closed magnetic core to realize that the flexibility of inductor impedance is continuously adjustable, wherein
When control switch in power frequency period open by all phase, positive winding is to closed magnetic core forward direction excitation, and reversed winding is to closing
The reversed excitation of magnetic core is closed, so that the impedance of inductor is approximately zero；When all phase turns off control switch in power frequency period, only
There is positive winding to closed magnetic core forward direction excitation, and reversed winding is not put into reach the impedance maximum value of inductor.
2. the circuit topology of flexible adjustable transformer neutral point ground connection as described in claim 1, wherein it is preferred, it is positive
Winding and reversed winding are concatenated structure, when the current amplitude in positive winding and reversed winding is equal, the excitation of the two
It cancels out each other；When flowing through electric current in positive winding and electric current is zero in reversed winding, the sum of impedance of the two is in maximum value；
When flowing through electric current in positive winding and being I+ and electric current is I- in reversed winding, reversed winding, which exists, to be shunted, I+ is greater than I-, and two
The sum of impedance of person is between maximum value and 0.
3. the circuit topology of adjustable transformer neutral point ground connection as described in claim 1 flexible, wherein described the number of turns and close
Core cross section product matching is closed so that closed magnetic core does not generate magnetic saturation under maximum current.
4. the circuit topology of adjustable transformer neutral point ground connection as described in claim 1 flexible, wherein control switch and anti-
It connects to winding parallel to control reversed winding shunts.
5. the circuit topology of flexible adjustable transformer neutral point ground connection as described in claim 1, wherein the control switch
Including bidirectional triode thyristor device, the time that the angle of flow by adjusting bidirectional triode thyristor device changes reversed winding circulating current is accounted for
Sky is than to realize that the flexibility of positive winding and reversed winding total impedance is continuously adjustable.
6. the circuit topology of flexible adjustable transformer neutral point ground connection as claimed in claim 5, wherein the control switch
Including cascade bidirectional triode thyristor device, the highest overvoltage of transformer neutral point is Umax, and bidirectional triode thyristor device is most
High withstanding voltage is Us, the quantity N of bidirectional triode thyristor device are as follows:
Wherein, η is safety coefficient, takes 0.5-0.7；N round numbers.
7. the circuit topology of flexible adjustable transformer neutral point ground connection as claimed in claim 6, wherein work as bidirectional triode thyristor
When the quantity N of device is more than 3, the quantity by changing bidirectional triode thyristor investment changes the number of turns of reversed winding investment to obtain just
Classification to winding and reversed winding total impedance is adjustable.
8. the circuit topology of flexible adjustable transformer neutral point ground connection as described in claim 1, wherein the inductor packet
Include the flexible REgulatable reactor based on balance winding.
9. the circuit topology of flexible adjustable transformer neutral point ground connection as described in claim 1, wherein the neutrality of transformer
Point highest overvoltage is 15kV, and closed magnetic core material is non-crystalline material, and core cross section product is preferably 50cm2, bidirectional triode thyristor device
Part is 8.5kV-1000A thyristor, and the quantity of bidirectional triode thyristor is preferably 4, and the number of turns of positive winding is 40 circles, reversely around component
Be 4 sections, every section of 10 circles and every section it is in parallel with a bidirectional triode thyristor device.
10. the control of the circuit topology of the adjustable transformer neutral point ground connection of flexibility described in a kind of any one of claim 1-9
Method comprising following steps,
First step, inductor arrangement between transformer neutral point and ground,
Second step, positive winding to closed magnetic core forward direction excitation, reversed winding to the reversed excitation of closed magnetic core,
Third step, conduction phase of the control switch in power frequency period continuously adjust, and control reversed winding to closed magnetic core
The degree of reversed excitation is continuously adjustable with the flexibility for realizing inductor impedance, wherein when control switch in power frequency period full phase
Position is when opening, and positive winding is to closed magnetic core forward direction excitation, and reversed winding is to the reversed excitation of closed magnetic core, so that inductor
Impedance is approximately zero；When all phase turns off control switch in power frequency period, only positive winding encourages closed magnetic core forward direction
Magnetic, and reversed winding is not put into reach the impedance maximum value of inductor.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201364801Y (en) * | 2009-02-12 | 2009-12-16 | 张帆 | Flux cancellation reactor |
| CN102545171A (en) * | 2011-12-22 | 2012-07-04 | 江苏宏安变压器有限公司 | Multi-winding adjustable reactor and single phase grounding fault clearing method thereof |
| CN108767833A (en) * | 2018-07-27 | 2018-11-06 | 国电南瑞科技股份有限公司 | Single-phase magneto-restrictive fault current limiter |
-
2019
- 2019-07-11 CN CN201910627085.9A patent/CN110517869A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201364801Y (en) * | 2009-02-12 | 2009-12-16 | 张帆 | Flux cancellation reactor |
| CN102545171A (en) * | 2011-12-22 | 2012-07-04 | 江苏宏安变压器有限公司 | Multi-winding adjustable reactor and single phase grounding fault clearing method thereof |
| CN108767833A (en) * | 2018-07-27 | 2018-11-06 | 国电南瑞科技股份有限公司 | Single-phase magneto-restrictive fault current limiter |
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Application publication date: 20191129 |