CN108962534B

CN108962534B - Ultra-high power converter with adjustable integrated combination parameter

Info

Publication number: CN108962534B
Application number: CN201810972380.3A
Authority: CN
Inventors: 宋执权; 仝玮; 傅鹏; 王琨; 汪舒生; 张秀青; 李华; 王重马; 王振尚
Original assignee: Hefei Institutes of Physical Science of CAS
Current assignee: Hefei Institutes of Physical Science of CAS
Priority date: 2018-08-24
Filing date: 2018-08-24
Publication date: 2023-06-27
Anticipated expiration: 2038-08-24
Also published as: CN108962534A

Abstract

The invention discloses an integrated combination parameter adjustable ultrahigh power converter device, which comprises three layers of trusses, an auxiliary switch block, an inductor reactor block and a capacitor block, wherein the auxiliary switch block, the inductor reactor block and the capacitor block are sequentially arranged on the three layers of trusses from top to bottom; the inductance reactor block is formed by connecting a plurality of inductance matrix blocks in series or in parallel, and an insulating plate I is arranged between the adjacent inductance matrix blocks. According to the invention, all modules required in the current conversion loop are longitudinally arranged in the fixed truss support, and all the connections are ensured to be in the same horizontal plane so as to facilitate serial-parallel connection among all the sub-modules, so that the design is quick and efficient, and unnecessary cost caused by parameter change is saved.

Description

Ultra-high power converter with adjustable integrated combination parameter

Technical Field

The invention relates to the technical field of quench protection systems of superconducting magnet devices, in particular to an integrated combination parameter adjustable ultrahigh power converter device which mainly has the effects of providing directional pulse current for a main loop when a superconducting magnet is quenched, manufacturing a current artificial zero crossing point, enabling a main loop switch to be quickly turned off by zero crossing, and quickly transferring energy in the superconducting magnet to an energy discharging resistor for energy consumption, thereby ensuring that the superconducting magnet is not irreversibly damaged due to a quench state for a long time.

Background

1. The quench protection switch system has the function that when a quench event occurs to the superconducting magnet, the energy in the magnet is rapidly transferred to the energy discharging resistor by means of the high-power direct current switch, so that the reliable protection of the superconducting magnet is realized, and the damage to the superconducting magnet is effectively avoided.

2. The high frequency pulsed current in the commutation loop is generated by the oscillation of a pre-charged pulsed capacitor and an inductive reactor.

3. The direct current has no natural zero crossing point, and the turn-off under the condition of large current is a great difficulty. Therefore, the pulse current released by the current conversion circuit counteracts the large current of the main circuit, so that a current zero-crossing point is artificially created.

At present, the design of a current conversion loop based on the artificial zero crossing technology is also limited to respectively designing a capacitor, an inductive reactor and an auxiliary switch and then conducting wire connection. The design of the scheme makes the use environment extremely single, and the design of one set of scheme can only meet one main loop parameter. When the parameters of the main loop change, the whole current conversion loop needs to be manufactured into a complete current conversion loop again according to the changed parameters. This will lead to an increase in experimental costs and waste of resources.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an integrated parameter-adjustable ultrahigh-power converter.

The invention is realized by the following technical scheme:

the utility model provides an ultra-high power current conversion device with adjustable integration combination parameter, includes three-layer truss and installs auxiliary switch module, inductor assembly and the condenser assembly on three-layer truss from top to bottom in proper order, adopts flange joint between the adjacent two-layer truss, installs the resin bucket support in the below of bottom truss, auxiliary switch module include a plurality of thyristor subassembly, a plurality of thyristor subassemblies form cage symmetrical distribution's matrix piece through a plurality of connection rows, be equipped with the lead-out wire in connection row upper end; the inductor reactor block is formed by connecting a plurality of inductor matrix blocks in series or in parallel, and an insulating plate I is arranged between the adjacent inductor matrix blocks; the capacitor block comprises a plurality of self-healing capacitors which are connected in parallel or in series, and an insulating plate II is arranged between the adjacent self-healing capacitors.

The thyristor assembly comprises a thyristor, crimping input busbar arranged at the upper and lower parts of the thyristor, the two input busbar are fixedly connected through bolts and nuts, a control wire is further arranged on the thyristor, crimping backing plates are arranged between the thyristor and one crimping input busbar, and one crimping input busbar is connected with the lead-out wire.

The inductance matrix block comprises a solenoid coil positioned in a fixed plate, lead terminals are led out upwards from leads at two ends of the solenoid coil, resin insulating plates are respectively arranged between the left end and the right end of the solenoid coil and the fixed plate, the upper ends and the lower ends of the two resin insulating plates are respectively connected through bolts, the left end and the right end of the bolts are respectively fixed on the fixed plate, and the outer sides of the solenoid coil are cast through insulating resin.

The inductance reactor blocks are arranged in a 2*5 matrix mode, and a plurality of inductance matrix blocks are connected in series or in parallel through connecting wire terminals.

The upper end of the self-healing capacitor is sequentially provided with a sealing cover, an outgoing line sleeve and a wiring terminal, electrodes of the capacitor are connected with an outgoing line connecting piece and the outgoing line sleeve, and finally the self-healing capacitor is connected with other capacitors in series or in parallel through the wiring terminal.

The capacitor blocks are arranged in a 5 x 20 matrix mode.

The invention has the advantages that: according to the invention, all modules required in the current conversion loop are longitudinally arranged in the fixed truss support, and all the connections are ensured to be in the same horizontal plane so as to facilitate serial-parallel connection among all the sub-modules. Meanwhile, on the basis of ensuring the integration of the modules, the inductance reactor block, the capacitor block and the auxiliary switch block are respectively subjected to matrix design, so that parameter adjustment is completed by changing serial-parallel connection of all sub-modules under the condition that the basic structure of the current conversion device is not changed. Such a design is not only fast and efficient, but also saves some unnecessary costs due to parameter variations.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a block diagram of an auxiliary switch.

Fig. 3 is a top view of the auxiliary switch block.

Fig. 4 is a left side view of a single wafer cassette assembly.

Fig. 5 is a front view of a single thyristor assembly.

Fig. 6 is a diagram of a single inductor matrix block configuration.

Fig. 7 is a block diagram of an inductor reactor.

Fig. 8 is a block diagram of a single capacitor.

Fig. 9 is a block diagram of a capacitor bank.

Detailed Description

As shown in fig. 1, 2 and 3, an integrated combination parameter adjustable ultra-high power converter comprises three layers of trusses 1, an auxiliary switch block 2, an inductor reactor block 3 and a capacitor block 4 which are sequentially arranged on the three layers of trusses 1 from top to bottom, wherein two adjacent layers of trusses 1 are connected by adopting a flange 5, a resin barrel bracket 6 is arranged below the bottom layer of trusses 1, the auxiliary switch block 2 comprises a plurality of thyristor assemblies 7, the thyristor assemblies 7 form a matrix block in a cage-type symmetrical distribution form through a plurality of connecting rows 8, and lead-out wires 9 are arranged at the upper ends of the connecting rows 8; the inductor reactor block 3 is formed by connecting a plurality of inductor matrix blocks 10 in series or in parallel, and an insulating plate I11 is arranged between the adjacent inductor matrix blocks 10; the capacitor block 4 comprises a plurality of self-healing capacitors 12 connected in parallel or in series, and an insulating plate II 13 is arranged between the adjacent self-healing capacitors 12.

As shown in fig. 4 and 5, the thyristor assembly 7 includes a thyristor 14, crimping input busbar 15 is disposed above and below the thyristor 14, the two input busbar 15 are fixedly connected through bolt and nut 16, a control wire 17 is further disposed on the thyristor 14, crimping pad 18 is disposed between the thyristor 14 and one side crimping input busbar 15, and the one side input busbar 15 is connected with the lead-out wire 9.

As shown in fig. 6, the inductance matrix block 10 includes a solenoid 20 located in a fixing plate 19, lead terminals 21 are led out upward from leads at both ends of the solenoid 20, resin insulating plates 22 are respectively disposed between left and right ends of the solenoid 20 and the fixing plate 19, upper ends and lower ends of the two resin insulating plates 22 are respectively connected by bolts 23, left and right ends of the bolts 23 are respectively fixed on the fixing plate 19, and outer sides of the solenoid 20 are cast by insulating resin.

As shown in fig. 7, the inductor reactor blocks 3 are arranged in a 2*5 matrix, and a plurality of inductor matrix blocks 10 are connected in series or in parallel by connecting the lead terminals 21 through the connection rows 24.

As shown in fig. 8, the upper end of the self-healing capacitor 12 is provided with a sealing cover 25, an outlet sleeve 26 and a connecting terminal 27 in sequence, the electrodes of the capacitor are connected with the outlet connecting piece and the outlet sleeve 26, and finally the self-healing capacitor is connected with other capacitors in series or in parallel through the connecting terminal 27.

As shown in fig. 9, the capacitor blocks 4 are arranged in a 5×20 matrix.

The whole converter module adopts an integrated design and adopts a truss structure design. Each block is laid out from bottom to top. The auxiliary switch block, the inductor reactor block and the capacitor block are respectively arranged from top to bottom in consideration of the weight factors of the blocks in the module. The insulating resin plate is arranged at the bottom of the block, and electromagnetic interference among the blocks is prevented while the blocks are supported. The outer lead of each assembly is connected in series with a copper bar fixed on the truss by using bolts, and an insulating plate is added between the copper bar and the truss, so that the connection reliability is ensured, and meanwhile, the electromagnetic interference and current leakage are reduced.

Each matrix block in each block is placed on the insulating truss, and the upper side of each matrix is a lead outgoing surface. The series-parallel connection between the matrices is accomplished on this face. The flange connection mode adopted between the blocks not only can ensure reliable connection, but also is convenient for the disassembly, maintenance and expansion of each matrix.

In order to meet the different requirements of the main loop on-off current and resistance voltage, the auxiliary switch block is formed by connecting a plurality of thyristors in series and parallel. Thyristors in the block adopt a matrix type distribution structure. Considering that the reliability requirement of triggering and conducting can be met only by achieving the current-sharing and voltage-sharing characteristics when a plurality of thyristors are connected in series and parallel, the invention adopts a cage type symmetrical distribution mode to arrange matrix blocks. The cage structure ensures that stray parameters on each thyristor branch are as consistent as possible, and the symmetrical distribution greatly reduces mutual inductance among the branches. The current sharing characteristic of the switch block is greatly improved. Meanwhile, each thyristor branch is connected with a large-resistance resistor in parallel, so that the voltage equalizing characteristic of the thyristor is improved. The thyristors are fixed with the lead-out wires in a crimping way, and the two series branches are connected by copper bars.

The inductor reactor block consists of 2 x 4 solenoid type inductor matrix blocks with the length of 200mm and the bottom radius of 50 mm. The leads at the two ends of each inductor are led out upwards, two insulating resin plates are fixed at the two ends of each inductor, and four bolts are arranged for fixing the two insulating resin plates with the platform. In order to ensure electromagnetic shielding, the whole matrix block is externally cast by insulating resin except the outgoing lines; simultaneously, electromagnetic isolation is carried out by the resin insulation board between the matrix blocks, and glass resin is smeared at the gap between the insulation board and the platform.

The capacitor block consists of 5 x 20 pulse capacitor matrix blocks. The single capacitor is selected from self-healing capacitors, and the self-healing capacitors have the advantages of excellent self-healing performance, small dielectric loss, low temperature rise, long service life, small volume, light weight and the like. The self-healing capacitor adopts a polypropylene film as a solid medium, and a layer of very thin metal is evaporated on the surface of the self-healing capacitor to serve as a conductive electrode. The electrode is connected with the outgoing line connecting sheet and the outgoing line sleeve, and finally the serial-parallel connection is completed with other capacitors through the wiring terminals.

Claims

1. An ultra-high power current conversion device with adjustable integral combination parameter, which is characterized in that: the auxiliary switch assembly comprises a plurality of thyristor assemblies, a matrix block in a cage type symmetrical distribution form is formed by a plurality of connecting rows, and lead wires are arranged at the upper ends of the connecting rows; the inductor reactor block is formed by connecting a plurality of inductor matrix blocks in series or in parallel, and an insulating plate I is arranged between the adjacent inductor matrix blocks; the capacitor block comprises a plurality of self-healing capacitors which are connected in parallel or in series, and an insulating plate II is arranged between the adjacent self-healing capacitors;

the thyristor assembly comprises a thyristor, crimping input busbar arranged at the upper and lower parts of the thyristor, wherein the two input busbar are fixedly connected through bolts and nuts, a control wire is also arranged on the thyristor, a crimping backing plate is arranged between the thyristor and one crimping input busbar, and one crimping input busbar is connected with the lead-out wire;

the inductance matrix block comprises a solenoid coil positioned in the fixed plate, lead terminals are led out upwards from leads at two ends of the solenoid coil, resin insulating plates are respectively arranged between the left end and the right end of the solenoid coil and the fixed plate, the upper ends and the lower ends of the two resin insulating plates are respectively connected through bolts, the left end and the right end of the bolts are respectively fixed on the fixed plate, and the outer sides of the solenoid coil are cast through insulating resin;

the inductance reactor blocks are arranged in a 2*5 matrix mode, and a plurality of inductance matrix blocks are connected in series or in parallel through connecting wire terminals;

the upper end of the self-healing capacitor is sequentially provided with a sealing cover, an outgoing line sleeve and a wiring terminal, the electrode of the capacitor is connected with an outgoing line connecting piece and the outgoing line sleeve, and finally the self-healing capacitor is connected with other capacitors in series or in parallel through the wiring terminal;

the capacitor blocks are arranged in a 5 x 20 matrix mode.