Converter valve half-bridge device based on IGCT device

Abstract

The invention belongs to the technical field of extra-high voltage flexible direct current transmission, and provides a converter valve half-bridge device based on an IGCT device. A half-bridge valve string unit is arranged in the middle of a half-bridge device mechanism; the lower end, the two sides of the left end and the upper end of the half-bridge valve string unit are frame units which are fixedly connected with the two supporting capacitors to form an integral outer frame structure of the half-bridge device; the power supply unit is arranged at the upper end of the middle of the half-bridge valve string unit, and the air-cooled anode reactor is arranged at the lower end of the half-bridge valve string unit and arranged in the frame unit. Therefore, according to the embodiment of the invention, the problems that the cost of a core device is high and the core device is irreplaceable can be solved, and the economical efficiency of the converter valve is improved; the air-cooled anode reactor capable of withstanding the impact of the instantaneous large current is developed, and the problem of withstanding the impact of the instantaneous large current can be effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultra-high voltage flexible direct current transmission, and in particular relates to a converter valve half-bridge device based on an IGCT device. Background Art

[0002] The core power devices used in the existing traditional flexible DC transmission converter valve field are mostly IGBT, IEGT and other devices, and the half-bridge device is mainly composed of IGBT and IEGT valve strings;

[0003] The half-bridge device formed by IGBT and IEGT valve string as the main structure has high cost in engineering applications and cannot be replaced by domestic products to reduce costs. At the same time, when a high-power half-bridge device fails, it is difficult to resist the impact of direct short-circuit current. Summary of the invention

[0004] In view of the high cost of the above-mentioned existence, the inability to reduce the cost by domestic substitution, and the difficulty in resisting the impact of the direct short-circuit current when a high-power half-bridge device fails, the present disclosure proposes a converter valve half-bridge device based on IGCT devices. It can effectively solve the problem of withstanding instantaneous high current impact, reduce engineering application costs and improve the operating safety of the half-bridge device submodule.

[0005] The embodiment of the present disclosure provides a converter valve half-bridge device based on an IGCT device, the half-bridge device comprising:

[0006] Half-bridge valve string unit, frame unit, air-cooled anode reactance;

[0007] The half-bridge valve string unit is connected to two supporting capacitors, and the two supporting capacitors are respectively: a first capacitor and a second capacitor;

[0008] The half-bridge valve string unit is also connected to a DC busbar, the frame unit is arranged on both sides of the half-bridge valve string unit, and the control unit is arranged in the frame unit;

[0009] The frame unit is fixedly connected to the first capacitor and the second capacitor, and the first capacitor and the second capacitor are alternately arranged to form an overall outer frame structure of the half-bridge device;

[0010] The half-bridge valve string unit is connected to a power supply unit arranged on the frame unit;

[0011] An air-cooled anode reactance is arranged at the bottom of the frame unit and the air-cooled anode reactance is electrically connected to the half-bridge valve string unit.

[0012] In some embodiments, the frame unit includes: a unit bottom plate, a unit vertical beam, a valve string unit frame and a unit top plate.

[0013] In some embodiments, a first surface of the half-bridge valve string unit is fixedly connected to the valve string unit frame, and a second surface is fixedly connected to the unit top plate.

[0014] In some embodiments, the valve string unit frame includes: a clamping device, a heat sink group, a clamping resistor and a clamping diode;

[0015] The clamping resistor and the clamping diode are mounted on two heat dissipation surfaces of the first heat sink respectively.

[0016] In some embodiments, the radiator group is provided with unit water inlet and outlet pipes respectively;

[0017] A first fast recovery diode is sandwiched between two heat sinks in the heat sink group.

[0018] In some embodiments, output copper bars are installed on the heat dissipation surfaces at the right ends of the two heat sinks; and an IGCT device is also sandwiched between the two heat sinks.

[0019] In some embodiments, a protective baffle is provided on the clamping device.

[0020] In some embodiments, one end of the DC busbar is connected to a terminal of the supporting capacitor, and the negative busbar is connected to a third heat sink in the half-bridge valve string unit;

[0021] The negative electrode row and the positive electrode row are connected to the output row of the air-cooled anode reactor.

[0022] In some embodiments, the lower end of the air-cooled anode reactor is mounted on the unit bottom plate through a fixing plate, and the front output row is connected to the first radiator in the half-bridge valve string unit.

[0023] In some embodiments, the control unit and the power supply unit are respectively fixedly disposed on a unit frame.

[0024] Beneficial effects of the present disclosure:

[0025] The present disclosure includes a half-bridge valve string unit disposed in the middle of the half-bridge device mechanism; the lower end, both sides of the left end and the upper end of the half-bridge valve string unit are frame units, and the frame unit is fixedly connected to two supporting capacitors to form an overall outer frame structure of the half-bridge device; the middle upper end of the half-bridge valve string unit is a power supply unit, and the lower end of the half-bridge valve string unit is provided with an air-cooled anode reactance, and the air-cooled anode reactance is arranged in the frame unit. It can be seen that the embodiments of the present disclosure can solve the problems of high cost of core components and irreplaceable core components, and improve the economy of the converter valve. In the prior art, the ability to resist current shocks is weak when a fault short-circuit current occurs during operation of a high-power unit, and the degree of module damage is relatively large. This structure develops an air-cooled anode reactor that can withstand instantaneous large current shocks to address this defect, and can effectively solve the problem of withstanding instantaneous large current shocks.

[0026] The new unit structure with IGCT as the core device is disclosed in this disclosure, which has obvious advantages over the unit structure volume of the same power level composed of other devices, greatly reducing the engineering application cost and improving the operation safety of the half-bridge device submodule. The structural design is integrated, and all valve string units and devices are reasonably arranged in a half-bridge device, which has a more compact structure and improves the space utilization while ensuring heat dissipation and safe operation.

[0027] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of a converter valve half-bridge device based on an IGCT device in an embodiment of the present application is shown;

[0030] Figure 2 A schematic diagram of the valve string unit frame structure in an embodiment of the present application is shown;

[0031] Figure 3 The support capacitor arrangement diagram in the embodiment of the present application is shown;

[0032] Figure 4 A schematic diagram of the converter valve structure of the IGCT device in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0034] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In the present application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the orientation or positional relationship shown in the accompanying drawings.

[0035] In order to solve the problems of high cost of core components of flexible DC transmission equipment, inability to replace domestic products, and weak fault resistance to short-circuit current impact, the present invention adopts IGCT devices to replace IGBT and IEGT core components to develop an anode reactor that can resist 600KA instantaneous short-circuit current impact. A new electrical topology is applied, and a new IGCT half-bridge structure is completed according to the new scheme, new structure, and new component layout.

[0036] It has a more compact structure and more comprehensive functions. It is more stable and reliable in explosion-proof than the first-generation IGCT half-bridge device and can effectively resist the impact of 600KA instantaneous short-circuit current caused by direct conduction under fault operation.

[0037] The embodiment of the present disclosure provides a converter valve half-bridge device based on an IGCT device, the half-bridge device comprising:

[0038] Half-bridge valve string unit 1, frame unit 4, air-cooled anode reactance 7;

[0039] The half-bridge valve string unit 1 is connected to two supporting capacitors 2, and the two supporting capacitors 2 are respectively: a first capacitor 21 and a second capacitor 22;

[0040] The half-bridge valve string unit 1 is also connected to a DC busbar 3. The frame unit 4 is arranged on both sides of the half-bridge valve string unit 1. A control unit 5 is arranged inside the frame unit.

[0041] The frame unit 4 is fixedly connected to the first capacitor 21 and the second capacitor 22, and the first capacitor 21 and the second capacitor 22 are staggered to form an overall outer frame structure of the half-bridge device;

[0042] The half-bridge valve string unit 1 is connected to a power supply unit 6 arranged on the frame unit;

[0043] An air-cooled anode reactance 7 is provided at the bottom of the frame unit 4 , and the air-cooled anode reactance 7 is electrically connected to the half-bridge valve string unit 1 .

[0044] In the present disclosure, the overall outer frame structure of the half-bridge device is formed by a stable connection with the right end support capacitor 2. The advantage of this structural arrangement is that the weight of each part is evenly arranged in the frame, which can effectively protect the safe operation of the core device, and the structure is compact, which can reduce the volume occupied by the half-bridge device.

[0045] Specifically, the frame unit 4 includes: a unit bottom plate 41 , a unit vertical beam 42 , a valve string unit frame 43 and a unit top plate 44 .

[0046] The first surface of the half-bridge valve string unit 1 is fixedly connected to the valve string unit frame 43 , and the second surface is fixedly connected to the unit top plate 44 .

[0047] Specifically, see Figure 2 , the valve string unit frame 43 includes: a clamping device 14, a heat sink group 18, a clamping resistor 15 and a clamping diode 16;

[0048] The clamp resistor 15 and the clamp diode 16 are mounted on two heat dissipation surfaces of the first heat sink 181 respectively.

[0049] The radiator group 18 is provided with unit water inlet and outlet pipes 13 respectively;

[0050] A first recovery diode 171 is sandwiched between two heat sinks in the heat sink group 18 .

[0051] Output copper bars 12 are mounted on the heat dissipation surfaces at the right ends of the two heat sinks; an IGCT device 111 is also sandwiched between the two heat sinks.

[0052] A protective baffle 19 is provided on the clamping device.

[0053] Specifically, the lower end of the half-bridge valve string unit 1 is fixed on the valve string unit frame 43, and the upper end is fixed on the unit top plate 44. The valve string unit frame 43 is composed of the following from bottom to top: a clamping device 14, which can provide a clamping force of 40KN at both ends; a first radiator 181, which is the bottom radiator of the five radiators in the radiator group 18; a clamping resistor 15 and a clamping diode 16 mounted on the two heat dissipation surfaces of the first radiator 181; unit inlet and outlet water pipes 13 are separately installed on the radiator group; a first fast recovery diode 171 is clamped between the two radiators; one end of the output copper busbar 12 is separately installed on the heat dissipation surface of the right end of the two radiators. The IGCT device 111 is clamped between the two radiators; and the protective baffle 19 is installed up and down on the clamping device to form an integral valve string structure.

[0054] In some embodiments, one end of the DC busbar 3 is connected to the wiring terminal of the support capacitor 2, and the negative electrode is connected to the third heat sink 183 in the half-bridge valve string unit 1;

[0055] The negative electrode row and the positive electrode row are connected to the output row 72 in the air-cooled anode reactor 7 .

[0056] In some embodiments, see Figure 1 , Figure 2 and Figure 4 The lower end of the air-cooled anode reactor 7 is mounted on the unit bottom plate 41 through a fixing plate 71, and the front output row 73 is connected to the first radiator 18-1 in the half-bridge valve string unit 1. The water pipe assembly is fixed on the single valve frame through a pipe clamp to eliminate the vibration generated when the water system is working.

[0057] The control unit 5 and the power supply unit 6 are respectively fixedly arranged on the unit frame 43. The requirements of wiring space and maintenance space are met, and the separation layout of high and low voltage areas is realized, thereby improving the safety of the module under operation.

[0058] See also Figure 3 The half-bridge device realizes the commutation function of the overall device by cascading with external modules through the external interfaces of the AC output copper bus 121 and the DC output bus 122.

[0059] The other end of the AC output copper busbar 121 is connected to the second radiator 182 , and the other end of the DC output busbar 122 is connected to the third radiator 183 .

[0060] Although the flexible DC transmission converter valve technology is relatively mature, it relies heavily on imported core components, which greatly limits the engineering. The disclosed embodiment reduces the high cost of core components and solves the problem that core components are irreplaceable, thereby improving the economy of the converter valve.

[0061] When a high-power unit is in operation and a short-circuit current occurs, its ability to resist current shock is weak and the module is severely damaged. To address this defect, this structure has developed an air-cooled anode reactor that can withstand instantaneous large current shocks, which can effectively solve the problem of withstanding instantaneous large current shocks.

[0062] The present disclosure is centered around a new unit structure with IGCT as the core device, which has obvious advantages in volume compared with unit structures of the same power level formed by other devices, greatly reducing engineering application costs and improving the operating safety of half-bridge device submodules.

[0063] The structural design is integrated, and all valve string units and devices are rationally arranged in a half-bridge device. The structure is more compact, which improves space utilization while ensuring heat dissipation and safe operation.

[0064] The new structure provided by the present disclosure is more clearly divided by function, and all device units and individual electrical parts can be independently installed, disassembled and maintained. When the equipment fails, it is convenient to troubleshoot the problem; the parts related to each device and the valve string unit are integrated into one through the unit frame to form a half-bridge device. This not only allows the front inspection channel to check the problem and replace the parts, but also brings great convenience to maintenance and repair, and also saves a lot of time.

[0065] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A converter valve half-bridge device based on an IGCT device, characterized in that: The half-bridge device comprises: A half-bridge valve string unit (1), a frame unit (4), and an air-cooled anode reactance (7); The half-bridge valve series unit (1) is connected to two supporting capacitors (2), and the two supporting capacitors (2) are respectively: a first capacitor (21) and a second capacitor (22); The half-bridge valve string unit (1) is also connected to a DC busbar (3), the frame unit (4) is arranged on both sides of the half-bridge valve string unit (1), and a control unit (5) is arranged inside the frame unit; The frame unit (4) is fixedly connected to the first capacitor (21) and the second capacitor (22), and the first capacitor (21) and the second capacitor (22) are arranged alternately to form an overall outer frame structure of the half-bridge device; The half-bridge valve string unit (1) is connected to a power supply unit (6) arranged on the frame unit; An air-cooled anode reactance (7) is provided at the bottom of the frame unit (4), and the air-cooled anode reactance (7) is electrically connected to the half-bridge valve string unit (1).

2. The converter valve half-bridge device according to claim 1, characterized in that: The frame unit (4) comprises: a unit bottom plate (41), a unit vertical beam (42), a valve string unit frame (43) and a unit top plate (44).

3. The converter valve half-bridge device according to claim 2, characterized in that: The first surface of the half-bridge valve string unit (1) is fixedly connected to the valve string unit frame (43), and the second surface is fixedly connected to the unit top plate (44).

4. The converter valve half-bridge device according to claim 3, characterized in that: The valve string unit frame (43) comprises: a clamping device (14), a heat sink group (18), a clamping resistor (15) and a clamping diode (16); The clamping resistor (15) and the clamping diode (16) are respectively mounted on two heat dissipation surfaces of the first heat sink (181).

5. The converter valve half-bridge device according to claim 4, characterized in that: The radiator group (18) is respectively provided with unit water inlet and outlet pipes (13); A first fast recovery diode (171) is sandwiched between two heat sinks in the heat sink group (18).

6. The converter valve half-bridge device according to claim 5, characterized in that: Output copper bars (12) are installed on the heat dissipation surfaces at the right ends of the two heat sinks; and an IGCT device (111) is sandwiched between the two heat sinks.

7. The converter valve half-bridge device according to claim 6, characterized in that: The clamping device is provided with a protective baffle (19).

8. The converter valve half-bridge device according to claim 1, characterized in that: One end of the DC busbar (3) is connected to the connection terminal of the supporting capacitor (2), and the negative electrode is connected to the third heat sink (183) in the half-bridge valve string unit (1); The negative electrode row and the positive electrode row are connected to the output row (72) in the air-cooled anode reactor (7).

9. The converter valve half-bridge device according to claim 8, characterized in that: The lower end of the air-cooled anode reactor (7) is mounted on the unit bottom plate (41) via a fixing plate (71), and the front output row (73) is connected to the first radiator (181) in the half-bridge valve train unit (1).

10. The converter valve half-bridge device according to claim 1, characterized in that: The control unit (5) and the power supply unit (6) are respectively fixedly arranged on the unit frame (43).

11. The converter valve half-bridge device according to claim 10, characterized in that: The half-bridge device is cascaded with an external module to perform current conversion via an external interface of an AC output copper busbar (121) and a DC output busbar (122); The other end of the AC output copper busbar (121) is connected to the second heat sink (182), and the other end of the DC output busbar (122) is connected to the third heat sink (183).

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