CN214626355U - Iron core-based hybrid high-temperature superconducting direct-current fault current limiter - Google Patents
Iron core-based hybrid high-temperature superconducting direct-current fault current limiter Download PDFInfo
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- CN214626355U CN214626355U CN202022662812.6U CN202022662812U CN214626355U CN 214626355 U CN214626355 U CN 214626355U CN 202022662812 U CN202022662812 U CN 202022662812U CN 214626355 U CN214626355 U CN 214626355U
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Abstract
The utility model discloses a mixed type high temperature superconducting direct current fault current limiter based on iron core, including the conductor frame, the left frame and the right frame of conductor frame twine respectively and have winding one and winding two, winding one and winding two establish ties respectively to direct current electric wire netting and DC power supply, just the magnetomotive force opposite direction that winding one and winding two produced. The device can rapidly and effectively present a resistor and an inductor to limit fault current in a direct current power grid, and is matched with a direct current breaker to cut off the fault current.
Description
Technical Field
The utility model relates to a superconductive electric power application, concretely relates to mixed type high temperature superconductive direct current fault current limiter based on iron core.
Background
In recent years, China has made a rapid achievement in the fields of direct current transmission, multi-terminal flexible direct current power grid technology and engineering application. When a direct current power grid fails, the system damping is relatively small, and therefore the fault current can reach dozens of times of rated current within a few milliseconds. In addition, the dc fault current is difficult to cut off due to the absence of zero crossings, which presents a significant challenge to dc circuit breakers. Therefore, how to efficiently and quickly limit and cut off the direct current fault current is a critical problem to be solved urgently by the direct current power grid.
The superconducting direct current fault current limiter has the working characteristics of presenting low impedance when the direct current power grid normally operates and presenting high impedance when the direct current power grid has a fault, so that the fault current of the direct current power grid can be effectively limited, and the stable operation of the direct current power grid is not interfered. Superconducting dc fault current limiters can be broadly divided into two categories according to their current limiting characteristics: 1. the resistive superconducting fault current limiter limits fault current by utilizing the characteristic that the fault current of a direct current power grid exceeds the critical current of a superconducting material, so that the superconducting material loses a superconducting state and presents resistance; 2. the inductance type superconductive fault current limiter limits fault current by utilizing the electromagnetic coupling relation between a superconductive winding and a ferromagnetic material. The two types of current limiters have different effects on limiting the short-circuit current, the inductive superconducting direct current limiter can effectively limit the rise rate of the short-circuit current, and the resistive superconducting direct current limiter can limit the maximum short-circuit current value.
Therefore, if a superconducting current limiter is provided to provide both resistance and reactance when a fault occurs, it is important that the dc network limit the fault current and shut it off.
SUMMERY OF THE UTILITY MODEL
To the demand of direct current electric wire netting to the current-limiting, the utility model provides a have mixed type superconductive direct current fault current limiter of resistance type and inductance type current limiter advantage concurrently. The device can rapidly and effectively present a resistor and an inductor to limit fault current in a direct current power grid, and is matched with a direct current breaker to cut off the fault current.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a mixed type high-temperature superconducting direct-current fault current limiter based on an iron core comprises a conductor frame, wherein a first winding and a second winding are wound on the left frame and the right frame of the conductor frame respectively, the first winding and the second winding are connected to a direct-current power grid and a direct-current power supply in series respectively, and magnetomotive force generated by the first winding and the second winding are opposite in direction.
As an optimized technical scheme of the utility model, winding one and winding two are superconducting coil.
As an optimized technical solution of the utility model, the conductor frame is the iron core.
As an optimized technical scheme of the utility model, the winding one still establishes ties there is direct current breaker.
As a preferred technical solution of the present invention, the number of turns of the first winding is smaller than the number of turns of the second winding.
As a preferred technical scheme of the utility model, the electric current flow direction in winding one and the winding two is the same.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model discloses utilized superconducting current limiter low impedance characteristic under normal operating condition, avoided the too big poor problem of interference immunity ability of bringing of direct current network system of conventional current-limiting reactor, improved direct current system's operating stability.
2. When direct current electric wire netting breaks down, the utility model discloses can enough provide reactance and restrain direct current fault current's rising speed, can provide resistance restriction short-circuit current again, and then reduced direct current electric wire netting and to the requirement of circuit breaker break-make current capacity.
Drawings
Fig. 1 shows a topology structure of a hybrid superconducting dc current limiter based on an iron core according to the present invention.
Fig. 2 shows the working states of a hybrid superconducting dc current limiter based on an iron core according to the present invention, wherein (a) shows the normal state and (b) shows the current limiting state.
Fig. 3 illustrates the current limiting principle of the hybrid superconducting dc current limiter based on an iron core according to the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following description of the preferred embodiments of the present invention is given with reference to the accompanying examples, but it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The utility model provides a be applicable to the flexible direct current transmission system of multiterminal, the superconductive fault current limiting device of mixed type of the restriction fault current that can be reliable and fast. The topological structure of the hybrid superconducting direct current limiter is shown in fig. 1 and mainly comprises an iron core, two groups of windings and a direct current power supply. Winding I (namely a superconducting coil 1) is wound on a core column on the left side of the iron core and is connected into a direct current power grid; a second winding (namely a superconducting coil 2) is wound on the core column at the right side of the iron core and is connected with a direct current power supply of the current limiter in series; the dc power supply continuously supplies dc current to the superconducting coil 2.
The main working states of the hybrid superconducting direct current limiter are shown in fig. 2, N1Representing the number of turns, N, of the superconducting coil 12Representing the number of turns of the superconducting coil 2. i.e. idc1For the current flowing through the superconducting coil 1 (current in the DC network), idc2Is the current (current supplied by a dc power supply) flowing through the superconducting coil 2. F1Is a magnetomotive force, F, generated by the superconducting coil 12Is the magnetomotive force generated by the superconducting coil 2, the magnetomotive force F1、F2All the time in opposite directions, F1、F2Are determined by the currents flowing through superconducting coils 1 and 2, respectively.
Fig. 3 is a basic magnetization curve (B-H curve) of a core of a superconducting dc current limiter, and the operating region of the superconducting dc current limiter is divided into three sections, i.e., a saturation region, a linear operating region, and a reverse saturation region, according to the difference in slope of the curve. In a linear working area close to the origin, the slope of the B-H curve is larger, the magnetic permeability is larger, and the inductive reactance presented by the current limiter is larger. In the saturation region far from the origin, following the magnetomotive force F1、F2The vector sum of the magnetic field intensity H of the iron core is larger, the slope of a B-H curve is smaller, the magnetic conductivity is reduced along with the increase of the magnetic field intensity H, and the inductive reactance presented by the current limiter is smaller. Therefore, the superconducting fault current limiter can automatically present different inductances according to the current magnitude of the direct current network. With reference to fig. 2 and 3, the operation states of the inductive superconducting dc current limiter can be mainly divided into two types:
(1) zero impedance state
When the direct current system normally operates, magnetomotive force is generated in the iron core of both the superconducting coil 1 and the superconducting coil 2. The magnetomotive force F generated by the superconducting coil 1 is relatively small due to the rated current of the direct current power grid1Much less than the magnetomotive force F generated by the superconducting coil 22This places the core in the saturation region. At the moment, the magnetic conductivity in the iron core is extremely low, so that the current-limiting winding is hardly coupled with the iron core, the inductance of the superconducting current-limiting current to a direct-current power grid is basically zero, and the superconducting direct-current limiter is in a zero inductance state; the rated current of the direct current power grid is far smaller than the critical current of the superconducting coil 1, so that the superconducting direct current limiter is in a zero resistance state. The superconducting direct current limiter does not influence the stability and dynamic response of a direct current system.
(2) Flow-limiting state
When a fault occurs in the direct current power grid, the instantaneously increased direct current fault current causes the magnetomotive force F generated in the superconducting coil 11The rapid increase causes the iron core originally in the saturation region to rapidly separate from the saturation state, and the working point moves from the saturation region to the linear working region along the B-H curve. In the process, the magnetic conductivity in the iron core is gradually increased, and the superconducting direct current limiter presents high inductance to a direct current network; the superconducting coil 1 loses the superconducting state when the short-circuit current of the direct current network exceeds the critical current of the superconducting coil 1, and the current is applied toExhibiting a high resistance. At this time, the superconducting dc current limiter exhibits a large impedance to the dc power network, thereby performing a current limiting function.
The invention also provides a direct current line fault processing method of the iron core-based hybrid high-temperature superconducting direct current fault current limiter, which comprises the following steps:
detecting the current of the direct current power grid line based on a current detection element connected in series with the direct current power grid line side, and transmitting the current to a protection device, wherein when the power grid normally works, the current i of the direct current power grid line is smaller than the critical current i2 of the superconducting coil I;
when a direct current power grid fluctuates, i detected by the current detection element is larger than a critical current i2 of the first superconducting coil, the first superconducting coil is in a high resistance state, or the current limiter is in a high inductance state, so that the current limiting effect is achieved, i is reduced, when i is smaller than i2, the power grid returns to normal, and the direct current breaker does not trip;
when a short-circuit fault occurs in a direct-current power grid, a current detection element detects that i is larger than a fault threshold current i1(i1 is larger than i2), the direct-current power grid fault is judged to occur, a protection device sends out a direct-current power grid line fault signal, at the moment, a first superconducting coil is in a high-resistance state or a current limiter is in a high-inductance state, the current limiting effect is achieved, and when the current detection element detects that the direct-current power grid line current is reduced to the value that i is not larger than i2, the protection device sends a tripping command to a direct-current circuit breaker to break a fault line.
According to the utility model discloses a description and attached drawing, the skilled person makes or uses very easily the utility model discloses a mixed type high temperature superconducting direct current fault current limiter based on iron core to can produce the positive effect that the utility model discloses record.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms such as "left side" and "right side" or the like, it is only for convenience of description and simplification of description, and it is not indicated or implied that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, so that the terms describing the orientation or positional relationship in the present invention are only used for exemplary illustration and are not to be construed as limitations of the present patent, and for those skilled in the art, specific meanings of the above terms can be understood according to specific situations by referring to the attached drawings.
Unless otherwise specifically stated or limited, the terms "wound" and "connected" in the present invention are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (6)
1. A mixed type high-temperature superconducting direct current fault current limiter based on an iron core is characterized in that: the magnetic power generation device comprises a conductor frame, wherein a first winding and a second winding are respectively wound on a left frame and a right frame of the conductor frame, the first winding and the second winding are respectively connected in series to a direct current power grid and a direct current power supply, and magnetomotive force generated by the first winding and the second winding are opposite in direction.
2. The iron core based hybrid high temperature superconducting direct current fault current limiter according to claim 1, wherein: the first winding and the second winding are both superconducting coils.
3. The iron core based hybrid high temperature superconducting direct current fault current limiter according to claim 1, wherein: the conductor frame is an iron core.
4. The iron core based hybrid high temperature superconducting direct current fault current limiter according to claim 1, wherein: and the first winding is also connected with a direct current breaker in series.
5. The iron core based hybrid high temperature superconducting direct current fault current limiter according to claim 1, wherein: the number of turns of the first winding is smaller than that of the second winding.
6. The iron core based hybrid high temperature superconducting direct current fault current limiter according to claim 1, wherein: and the current flow directions in the first winding and the second winding are the same.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022662812.6U CN214626355U (en) | 2020-11-17 | 2020-11-17 | Iron core-based hybrid high-temperature superconducting direct-current fault current limiter |
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| CN202022662812.6U CN214626355U (en) | 2020-11-17 | 2020-11-17 | Iron core-based hybrid high-temperature superconducting direct-current fault current limiter |
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