CN113014133A - Pulse current fast-falling magnetic field coil power supply for spheromak device - Google Patents
Pulse current fast-falling magnetic field coil power supply for spheromak device Download PDFInfo
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- CN113014133A CN113014133A CN202110423970.2A CN202110423970A CN113014133A CN 113014133 A CN113014133 A CN 113014133A CN 202110423970 A CN202110423970 A CN 202110423970A CN 113014133 A CN113014133 A CN 113014133A
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- magnetic field
- power supply
- field coil
- capacitor
- spherical tokamak
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M11/00—Power conversion systems not covered by the preceding groups
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a pulse current rapid-reduction magnetic field coil power supply for a spherical mark device, which is a power supply acting on a spherical tokamak device and providing a ring voltage for the magnetic field coil, and can ensure that the pulse current reduction speed of the spherical tokamak device reaches the order of MA/s; the magnetic field coil power supply comprises a capacitor C, an anti-parallel diode D1, a fully-controlled switch device S and an inductance follow current circuit, wherein the inductance follow current circuit comprises a follow current diode D2 and a follow current resistor R, and a coil inductance Load is a magnetic field coil of the spherical Tokamak device. The invention increases the power supply topology of the pulse current reduction speed, so that the pulse current is reduced rapidly, and the problem that the high loop voltage cannot be provided due to the slow reduction of the pulse current of the spherical Tokamak device is solved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a pulse current rapid-descent magnetic field coil power supply for a spheromak device.
Background
If the spherical Tokamak device adopts a compression fusion starting mode, the center solenoid can be replaced by a pole-to-field coil providing ring voltage breakdown plasma. The power supply is used for the first compression fusion starting device built in China, and related power supply technologies are not available in China.
In order to achieve pre-ionization of the gas in the spherical tokamak device, the pulse current waveform reduction rate needs to be increased. The actually measured waveform of the prior art is shown in fig. 3(a), and it can be seen from fig. 3(a) that the falling speed of the pulse current waveform is slow, but the falling speed of the pulse current waveform is too small to facilitate plasma breakdown.
Disclosure of Invention
The invention aims to solve the technical problem that the current reduction rate of the existing pulse power supply of the spherical Tokamak device is too small, and aims to provide a pulse current fast-reduction magnetic field coil power supply for the spherical Tokamak device, increase the pulse current reduction speed and solve the problem that the pulse current of the spherical Tokamak device is fast reduced. Wherein, the ball mark device is a ball-shaped tokamak device.
The invention is realized by the following technical scheme:
a magnetic field coil power supply for rapid reduction of pulse current of a spherical Tokamak device is a power supply for providing breakdown ring voltage for the magnetic field coil of the spherical Tokamak device, and can enable the reduction speed of the pulse current of the spherical Tokamak device to reach the order of MA/s.
As a further preferable scheme, the magnetic field coil power supply comprises a capacitor C, an anti-parallel diode D1, a fully-controlled switching device S, and an inductive freewheeling circuit, the inductive freewheeling circuit comprises a freewheeling diode D2 and a freewheeling resistor R, and the coil inductor Load is a magnetic field coil of the spherical tokamak apparatus;
the capacitor C is used for providing pulse current for the coil inductor Load; the anti-parallel diode D1 of the capacitor C is used to prevent the polarity capacitor C from being charged in reverse; the full-control type switching device S is used for forced commutation; the freewheeling diode D2 and the freewheeling resistor R form a freewheeling loop for freewheeling after pulse current forced commutation, and the resistor R in the loop is a key device for changing the falling rate of the pulse current.
The connection relationship of the respective devices is as follows:
one end of the capacitor C is connected with a fully-controlled switch device S, the fully-controlled switch device S is connected with one end of a coil inductor Load, and the other end of the coil inductor Load is connected with the other end of the capacitor C;
the anti-parallel diode D1 and the inductance follow current circuit are both connected with a capacitor C in parallel, the anode of the anti-parallel diode D1 is connected with the other end of the capacitor C, and the cathode of the anti-parallel diode D1 is connected with one end of a fully-controlled switching device S; the other end of the full-control type switching device S is connected with one end of an inductance follow current circuit, and the other end of the inductance follow current circuit is connected with the other end of a capacitor C;
and one end of the follow current resistor R is connected with the other end of the capacitor, the other end of the follow current resistor R is connected with the anode of a follow current diode D2, and the cathode of the follow current diode D2 is connected with the other end of the fully-controlled switching device S.
Preferably, the free-wheeling resistor R consumes energy remaining in the magnetic field coil of the spherical tokamak device, so as to increase a pulse current reduction rate of the tokamak device and provide a high ring voltage to the tokamak device. The type of the follow current resistor R can adopt a common resistor or a piezoresistor, (1) when the follow current resistor R adopts the common resistor, the dropping speed can be improved, but the linearity is not good; (2) the follow current resistor R is a piezoresistor, so that the pulse current of the Tokamak device is reduced more quickly and the linearity is improved; the comparison of the current drop waveform is shown in fig. 4, and the effect of the piezoresistor is better than that of the common resistor as a whole.
And determining whether the magnetic field coil power supply is selected to provide ring voltage breakdown plasma according to the operation mode of the spherical Tokamak device. Compared with the prior art, the invention has the following advantages and beneficial effects:
the magnetic field coil power supply is a power supply which acts on the spherical Tokamak device and provides breakdown ring voltage for the magnetic field coil, and the maximum falling speed of pulse current of the spherical Tokamak device can reach at least-2.5 MA/s; the invention increases the power topology of the pulse current reduction speed, changes the current reduction slope by changing the resistance of the follow current loop, so that the pulse current is rapidly reduced, provides the loop voltage for the magnetic field coil, and solves the problem that the high loop voltage cannot be provided due to the slow rapid reduction of the pulse current of the spherical Tokamak device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a magnetic field coil power supply for a spherical tokamak apparatus according to the present invention, in which a pulse current rapidly decreases.
Fig. 2 is a schematic diagram of the circuit operation of a magnetic field coil power supply for a spherical tokamak apparatus with a rapid decrease in pulse current according to the present invention.
Fig. 3 is a diagram of a measured waveform of the present invention.
Fig. 4 is a comparison graph of current drop waveforms when the freewheel resistor is a non-inductive resistor and a varistor.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1 to 4, in order to solve the problem that the current drop rate of the pulse power supply of the spherical tokamak device is too small, the invention provides a power supply topology capable of increasing the current drop rate of the pulse power supply. The magnetic field coil power supply for the rapid pulse current reduction of the spherical Tokamak device is a power supply for providing a breakdown ring voltage for the magnetic field coil of the spherical Tokamak device, and can enable the pulse current reduction speed of the spherical Tokamak device to reach the order of MA/s. For example, the maximum falling speed of the pulse current of the spherical Tokamak device can reach at least-2.5 MA/s.
In the specific implementation: as shown in fig. 1, the magnetic field coil power supply includes a capacitor C, an anti-parallel diode D1, a fully-controlled switching device S, and an inductive freewheeling circuit, where the inductive freewheeling circuit includes a freewheeling diode D2 and a freewheeling resistor R, and the coil inductor Load is a magnetic field coil of a spherical tokamak apparatus;
the capacitor C is used for providing pulse current for the coil inductor Load; the anti-parallel diode D1 of the capacitor C is used to prevent the polarity capacitor C from being charged in reverse; the full-control type switching device S is used for forced commutation; the freewheeling diode D2 and the freewheeling resistor R form a freewheeling loop for freewheeling after pulse current forced commutation, and the resistor R in the loop is a key device for changing the falling rate of the pulse current.
The connection relationship of the respective devices is as follows:
one end of the capacitor C is connected with a fully-controlled switch device S, the fully-controlled switch device S is connected with one end of a coil inductor Load, and the other end of the coil inductor Load is connected with the other end of the capacitor C;
the anti-parallel diode D1 and the inductance follow current circuit are both connected with a capacitor C in parallel, the anode of the anti-parallel diode D1 is connected with the other end of the capacitor C, and the cathode of the anti-parallel diode D1 is connected with one end of a fully-controlled switching device S; the other end of the full-control type switching device S is connected with one end of an inductance follow current circuit, and the other end of the inductance follow current circuit is connected with the other end of a capacitor C;
and one end of the follow current resistor R is connected with the other end of the capacitor, the other end of the follow current resistor R is connected with the anode of a follow current diode D2, and the cathode of the follow current diode D2 is connected with the other end of the fully-controlled switching device S.
The function of the follow current resistor R is to consume the energy left in the coil of the spherical Tokamak device, so that the pulse current reduction speed of the Tokamak device is increased, and high ring voltage is provided for the Tokamak device. The type of the follow current resistor R can adopt a common resistor or a piezoresistor, (1) when the follow current resistor R adopts the common resistor, the dropping speed can be improved, but the linearity is not good; (2) the follow current resistor R is a piezoresistor, so that the pulse current of the Tokamak device is reduced more quickly and the linearity is improved; the comparison of the current drop waveform is shown in fig. 4, and the effect of the piezoresistor is better than that of the common resistor as a whole.
And determining whether the magnetic field coil power supply is selected to provide ring voltage breakdown plasma according to the operation mode of the spherical Tokamak device.
The working flow of the invention is shown in figure 2, and in figure 2, (a) the control waveform of the fully-controlled switch; (b) the voltage of the capacitor C; (c) current flowing through the fully controlled switch; (d) current flowing through the freewheel loop; (e) a load current; the following were used:
before the time t0, the fully-controlled switching device S is switched off, the voltage of the capacitor C is greater than zero and keeps unchanged, and the Load has no current;
from t0 to t1, the fully-controlled switching device S is turned on, the discharging voltage of the capacitor C to the Load is continuously and gradually reduced, as shown in fig. 2(b), the Load current is gradually increased, and the current slope is positive;
at time t1, when the capacitor C finishes discharging, the voltage is zero, and the current reaches the highest peak, as shown in fig. 2(e), but the slope is zero;
after time t1, the fully-controlled switching device S is turned off, forcing current to flow from the fully-controlled switch S to the freewheeling circuit, see fig. 2(c) and (d), at which time the load current drops rapidly from the highest point to zero and the current slope is negative.
Wherein, t 0: the conduction time of the full-control switch; t 1: and the turn-off time of the full-control switch.
The scheme can change the current reduction slope by changing the resistance of the follow current loop.
The invention has been applied to spherical tokamak devices: the circuit diagram of the main circuit is shown in fig. 1, and the circuit consists of a capacitor C, an anti-parallel diode D1, a fully-controlled switching device S, a freewheeling diode D2, a freewheeling resistor R and a coil inductor Load.
Fig. 3 shows actually measured waveforms, where fig. 3(a) shows a pulse current waveform with a slow falling rate, in which the time from the peak current 4kA to zero is longer than 60ms, fig. 3(b) shows a pulse current waveform with an increased falling rate, in which the time from the peak current 4kA to zero is shorter than 3ms, and the improvement in the falling rate of the waveform of fig. 3(b) is increased.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A magnetic field coil power supply for rapid pulse current reduction of a spherical Tokamak device is characterized in that the magnetic field coil power supply is a power supply for providing a breakdown ring voltage for the magnetic field coil of the spherical Tokamak device, and the pulse current reduction speed of the spherical Tokamak device can reach the order of MA/s.
2. A magnetic field coil power supply for rapid pulsed current drop of a spherical tokamak device according to claim 1, wherein the magnetic field coil power supply comprises a capacitor C, an anti-parallel diode D1, a fully controlled switching device S and an inductive freewheeling circuit, the coil inductor Load is the magnetic field coil of the spherical tokamak device;
one end of the capacitor C is connected with a fully-controlled switch device S, the fully-controlled switch device S is connected with one end of a coil inductor Load, and the other end of the coil inductor Load is connected with the other end of the capacitor C;
the anti-parallel diode D1 and the inductance follow current circuit are both connected with a capacitor C in parallel, the anode of the anti-parallel diode D1 is connected with the other end of the capacitor C, and the cathode of the anti-parallel diode D1 is connected with one end of a fully-controlled switching device S; the other end of the full-control type switch device S is connected with one end of an inductance follow current circuit, and the other end of the inductance follow current circuit is connected with the other end of a capacitor C.
3. A magnetic field coil power supply for rapid pulse current reduction of a spherical Tokamak device according to claim 2, characterized in that, the inductive freewheeling circuit comprises a freewheeling diode D2 and a freewheeling resistor R, one end of the freewheeling resistor R is connected to the other end of the capacitor, the other end of the freewheeling resistor R is connected to the anode of the freewheeling diode D2, and the cathode of the freewheeling diode D2 is connected to the other end of the fully-controlled switching device S.
4. A magnetic field coil power supply for a rapid decrease in pulsed current for a spherical tokamak apparatus according to claim 3, wherein said follow current resistor R is a common resistor.
5. A magnetic field coil power supply for rapid pulsed current drop for spherical tokamak apparatus according to claim 3, wherein said follow current resistor R is a varistor.
6. A magnetic field coil power supply for a rapid decrease in pulsed current for a spherical tokamak apparatus as recited in claim 2, wherein said capacitor C is a polar capacitor.
7. A magnetic field coil power supply for a spherical tokamak device in which pulsed current ramp down is used according to claim 1, wherein the magnetic field coil power supply is selected to provide a ring voltage breakdown plasma based on the operating mode of the spherical tokamak device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110423970.2A CN113014133A (en) | 2021-04-20 | 2021-04-20 | Pulse current fast-falling magnetic field coil power supply for spheromak device |
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| CN202110423970.2A CN113014133A (en) | 2021-04-20 | 2021-04-20 | Pulse current fast-falling magnetic field coil power supply for spheromak device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114094820A (en) * | 2021-11-22 | 2022-02-25 | 核工业西南物理研究院 | Capacitor energy storage type current reduction slope adjustable power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114094820A (en) * | 2021-11-22 | 2022-02-25 | 核工业西南物理研究院 | Capacitor energy storage type current reduction slope adjustable power supply |
| CN114094820B (en) * | 2021-11-22 | 2023-09-08 | 核工业西南物理研究院 | Capacitor energy storage type current falling slope adjustable power supply |
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Application publication date: 20210622 |