Compact flexible direct current converter valve and power assembly thereof

Abstract

The invention provides a compact flexible direct-current converter valve and a power assembly thereof. The compact flexible direct-current converter valve comprises a plurality of power units, a plurality of control units and a plurality of direct-current capacitors which are connected in a one-to-one correspondence manner, wherein each power unit at least comprises a plurality of water-cooled radiators, a plurality of IGBTs (Insulated Gate Bipolar Translator), a plurality of thyristors and a plurality of first insulators. The plurality of IGBTs, the thyristors and the first insulators are sequentially arranged at intervals, the plurality of water-cooled radiators are sequentially arranged between the adjacent IGBTs, between the adjacent IGBTs and the thyristors and between the adjacent thyristors and the first insulators at intervals, and the adjacent IGBTs and the adjacent IGBTs and the thyristors are electrically connected, so that the spatial distance between power units is greatly reduced, and the power unit power is improved. The power assembly has the advantages of being high in operation reliability, compact in space size and light in weight.

Description

Technical Field

[0001] The present application relates to the technical field of flexible direct current power transmission, and in particular to a compact flexible direct current converter valve and a power component thereof. Background Art

[0002] Flexible high-voltage direct current transmission technology is a new type of transmission technology based on voltage source converters, self-shutoff devices (usually IGBTs) and pulse width modulation (PWM) technology. This transmission technology has the advantages of being able to supply power to passive networks, no commutation failure, no need for communication between converter stations, and easy to form a multi-terminal DC system.

[0003] The converter valve is the core equipment in the field of flexible high-voltage direct current transmission. Its function is to obtain the desired DC voltage by connecting the three-phase AC voltage to the DC end in sequence and to achieve power control. With the continuous improvement of the voltage level and capacity of flexible direct current transmission, the number of converter valves has also increased, and the size and weight of the converter valves have also increased. However, for power generation platforms with special environments such as offshore, the limited platform footprint makes it possible to provide a compact and highly reliable flexible direct current transmission converter valve and its power components, which has become a key technology for the application of flexible direct current transmission technology in offshore wind power grid connection and transmission. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the first purpose of the present application is to propose a compact flexible DC converter valve and a power component thereof, which can reduce the spatial distance between small power units and save the amount of structural parts of the power component.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a compact converter valve power component, including an integrated switch component, a plurality of control units and a plurality of DC capacitors; the integrated switch component includes a plurality of power units, and the plurality of power units are connected one-to-one with the plurality of control units and the plurality of DC capacitors; wherein,

[0007] Each of the power units at least includes a water-cooled radiator, an IGBT switch tube, a thyristor and a first insulator; the number of the water-cooled radiator and the IGBT switch tube includes multiple, and the multiple IGBT switch tubes, the thyristors and the first insulator are arranged in sequence at intervals, and the multiple water-cooled radiators are arranged in sequence at intervals between adjacent IGBT switch tubes, adjacent IGBT switch tubes and the thyristors, and adjacent thyristors and the first insulator, electrically connecting adjacent IGBT switch tubes and adjacent IGBT switch tubes and the thyristors.

[0008] Optionally, the multiple water-cooled radiators include a first water-cooled radiator, a second water-cooled radiator, a third water-cooled radiator and a fourth water-cooled radiator which are arranged in sequence at intervals; the multiple IGBT switching tubes include at least a first IGBT and a second IGBT, and the collector of the first IGBT is electrically connected to the first side of the first water-cooled radiator, the emitter of the first IGBT is electrically connected to the second side of the second water-cooled radiator, the collector of the second IGBT is electrically connected to the first side of the second water-cooled radiator, the emitter of the second IGBT is electrically connected to the second side of the third water-cooled radiator, the anode of the thyristor is electrically connected to the first side of the third water-cooled radiator, the cathode of the thyristor is electrically connected to the second side of the fourth water-cooled radiator, and the first insulator is connected to the first side of the fourth water-cooled radiator.

[0009] Optionally, the power unit further includes a first AC output connection bar and a second AC output connection bar, the first AC output connection bar is crimped and fixed to the third side of the second water-cooled radiator, and the second AC output connection bar is crimped and fixed to the third side of the third water-cooled radiator.

[0010] Optionally, the power unit also includes a first composite busbar and a bypass switch tube, and the first composite busbar is respectively crimped and fixed and electrically connected to the first water-cooled radiator, the second water-cooled radiator, the third water-cooled radiator, the fourth side of the fourth water-cooled radiator, and the fourth side of the bypass switch tube, and the bypass switch tube, the thyristor and the second IGBT are connected in parallel with each other.

[0011] Optionally, the first composite busbar is further provided with a plurality of connection terminals, and the DC capacitor is electrically connected to the corresponding power unit through the connection terminals of the first composite busbar.

[0012] Optionally, a plurality of the power units are cascaded in sequence, and the first insulator of the power unit of the previous stage is crimped and fixed to the second side surface of the first water-cooling radiator of the power unit of the next stage.

[0013] Optionally, the integrated switch assembly also includes a fixed frame, which includes a first clamping end plate and a second clamping end plate, and a plurality of connecting rods connecting the first clamping end plate and the second clamping end plate; the plurality of connecting rods are detachably connected to the first clamping end plate and the second clamping end plate to adjust the spacing between the first clamping end plate and the second clamping end plate, and to confine the plurality of power units cascaded in sequence between the first clamping end plate and the second clamping end plate.

[0014] Optionally, the multiple connecting rods include at least four rod-shaped members with threads at both ends, and the two ends of each connecting rod are threadedly connected to the first clamping end plate and the second clamping end plate respectively, and the four connecting rods and the first clamping end plate and the second clamping end plate together form the rectangular fixed frame.

[0015] Optionally, the power component also includes a second insulator and a butterfly spring, the second insulator is arranged between the first clamping end plate and the first water-cooled radiator of the first-level power unit, and the butterfly spring is arranged between the second clamping end plate and the first insulator of the last-level power unit.

[0016] To achieve the above objectives, a first aspect of the present application provides a compact flexible DC converter valve, wherein the converter valve includes the compact converter valve power component described in any of the above embodiments.

[0017] The compact flexible DC converter valve and its power components provided by the present application have at least the following beneficial effects:

[0018] The present application provides a compact flexible DC converter valve and its power assembly, including a plurality of power units, a plurality of control units and a plurality of DC capacitors connected in a one-to-one correspondence; wherein each power unit at least includes a water-cooled radiator, an IGBT switch tube, a thyristor and a first insulator, and the number of the water-cooled radiator and the IGBT switch tube includes a plurality. By sequentially arranging a plurality of IGBT switch tubes, a thyristor and a first insulator at intervals, and sequentially arranging a plurality of water-cooled radiators at intervals between adjacent IGBT switch tubes, adjacent IGBT switch tubes and thyristors, and adjacent thyristors and first insulators, and electrically connecting adjacent IGBT switch tubes and adjacent IGBT switch tubes and thyristors, the spatial distance between the power units is greatly reduced, and the amount of structural parts of the power assembly is also saved, and the valve has the characteristics of high operating reliability, compact space volume and light weight.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is a schematic diagram of an electrical circuit of a power component according to an embodiment of the present application.

[0022] Figure 2 It is a schematic diagram of the structure of a power component according to an embodiment of the present application.

[0023] Figure 3 It is a schematic diagram of the front-view structure of a power unit according to an embodiment of the present application.

[0024] Figure 4 It is a schematic diagram of the rear view structure of a power unit according to an embodiment of the present application.

[0025] Figure 5 It is a schematic diagram of the structure of an integrated switch assembly from a front perspective according to an embodiment of the present application.

[0026] Figure 6 It is a schematic diagram of the structure of an integrated switch assembly from a rear perspective according to an embodiment of the present application.

[0027] 10 power assembly; 100 integrated switch assembly; 110 power unit; 111 water cooling radiator; 112 IGBT switch tube; 113 thyristor; 114 first insulator; 115 first AC output connection bar; 116 second AC output connection bar; 117 bypass open tube; 118 first composite busbar; 1181 connecting terminal; 119 second insulator; 120 butterfly spring; 130 fixing frame; 131 first clamping end plate; 132 second clamping end plate; 133 connecting rod; 200 control unit; 300 DC capacitor; 310 second composite busbar DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] According to one aspect of the present application, a compact converter valve power component is provided, such as Figure 1 and Figure 2 As shown, the power component 10 includes an integrated switch component 100, and a plurality of control units 200 and a plurality of DC capacitors 300 electrically connected to the integrated switch component 100. The integrated switch component 100 includes a plurality of power units 110, and the plurality of power units 110 are connected to the plurality of control units 200 and the plurality of DC capacitors 300 in a one-to-one correspondence.

[0030] like Figure 3 and Figure 4As shown, each power unit 110 includes at least a water-cooled radiator 111, an IGBT switch tube 112, a thyristor 113 and a first insulator 114. The number of the water-cooled radiator 111 and the IGBT switch tube 112 includes multiple, and the multiple IGBT switch tubes 112, the thyristor 113 and the first insulator 114 are arranged in sequence at intervals. The multiple water-cooled radiators 111 are arranged in sequence at intervals between adjacent IGBT switch tubes 112, adjacent IGBT switch tubes 112 and thyristors 113, and adjacent thyristors 113 and the first insulator 114, and the adjacent IGBT switch tubes 112 and adjacent IGBT switch tubes 112 and thyristors 113 are connected in series and electrically connected. That is to say, the number of water-cooled radiators 111 in each power unit 110 is equal to the sum of the number of IGBT switch tubes 112, thyristors 113 and first insulators 114, so that the IGBT switch tubes 112, thyristors 113 and first insulators 114 can be arranged in sequence between two adjacent water-cooled radiators 111.

[0031] The IGBT switch tube 112 is a press-fit IGBT device. Since the press-fit IGBT device is a double-sided conductive structure, and the two end surfaces of the press-fit IGBT device are the collector and the emitter respectively, it has both conductive and heat dissipation functions. Therefore, by connecting the collector and the emitter of the press-fit IGBT device to the two opposite sides of two adjacent water-cooled radiators 111 respectively, the heat generated by the operation of the press-fit IGBT device can be timely transferred to the water-cooled radiators 111 on both sides, thereby ensuring the switching stability of the IGBT.

[0032] The multiple water-cooled radiators 111 may specifically include a first water-cooled radiator, a second water-cooled radiator, a third water-cooled radiator and a fourth water-cooled radiator which are arranged in sequence at intervals, and each water-cooled radiator 111 includes a first side surface and a second side surface opposite to each other; the multiple IGBT switching tubes 112 include a first IGBT and a second IGBT, and the collector of the first IGBT is electrically connected to the first side surface of the first water-cooled radiator, the emitter of the first IGBT is electrically connected to the second side surface of the second water-cooled radiator, the collector of the second IGBT is electrically connected to the first side surface of the second water-cooled radiator, the emitter of the second IGBT is electrically connected to the second side surface of the third water-cooled radiator, the anode of the thyristor 113 is electrically connected to the first side surface of the third water-cooled radiator, the cathode of the thyristor 113 is electrically connected to the second side surface of the fourth water-cooled radiator, and the first insulator 114 is connected to the first side surface of the fourth water-cooled radiator.

[0033] like Figure 5 and Figure 6As shown, the multiple power units 110 of the integrated switch assembly 100 are cascaded in sequence, and the first insulator 114 of the upper power unit 110 is crimped and fixed to the second side of the first water-cooled radiator of the lower power unit 110, forming a group-type crimping installation structure. The group-type connection between the multiple power units 110 of the integrated switch assembly 100 greatly reduces the spatial distance between the power units 110, thereby greatly saving the amount of structural parts of the power assembly 10, and has the characteristics of high operational reliability, compact space volume, and light weight. Therefore, compared with the existing converter valve power assembly using a single power unit electrical circuit and a separately designed structure, the volume of the compact converter valve power assembly provided by the present application can be reduced by more than 10%, and the weight can be reduced by more than 10%.

[0034] In some embodiments, Figure 1 and Figure 2 As shown, each power unit 110 also includes a first AC output connecting bar 115, a second AC output connecting bar 116, a first composite busbar 118 and a bypass opening tube 117, and each water-cooled radiator also includes a third side and a fourth side relative to each other, and the third side and the fourth side are two sides adjacent to the first side and the second side.

[0035] The first AC output connection row 115 is crimped and fixed to the third side of the second water-cooled radiator, and the second AC output connection row 116 is crimped and fixed to the third side of the third water-cooled radiator, so that the second water-cooled radiator and the third water-cooled radiator can be electrically connected to other device structures through the corresponding AC output connection rows.

[0036] The first composite busbar 118 has an "L"-shaped structure, including a first connection portion and a second connection portion connected to each other, wherein the first connection portion of the first composite busbar 118 is respectively crimped and fixed to and electrically connected to the fourth side of the first water-cooled radiator, the second water-cooled radiator, the third water-cooled radiator, and the fourth water-cooled radiator, and the second connection portion of the first composite busbar 118 is crimped and fixed to and electrically connected to the bypass switch tube at one end away from the first connection portion, so that the bypass switch tube can be electrically connected to the first water-cooled radiator, the second water-cooled radiator, the third water-cooled radiator, and the fourth water-cooled radiator. The bypass switch tube is arranged below the water-cooled radiator 111, and the bypass switch tube is electrically connected to a side of the water-cooled radiator 111 in the same direction through the first composite busbar 118, thereby making the bypass switch tube, the thyristor, and the second IGBT mutually connected in parallel.

[0037] Furthermore, a plurality of connection terminals 1181 are provided on the first composite busbar 118 , and the DC capacitor 300 is electrically connected to the power unit 110 in a one-to-one correspondence via the connection terminals 1181 of the first composite busbar 118 .

[0038] Furthermore, if Figure 2 As shown, a second composite busbar 310 is also included between the DC capacitor 300 and the connection terminal 1181, and each second composite busbar 310 corresponds one-to-one to each DC capacitor 300, so that the DC capacitor 300 can be electrically connected to the corresponding power unit 110 through the second composite busbar 310 and the first composite busbar 118 in sequence.

[0039] In some embodiments, Figure 5 and Figure 6 As shown, the integrated switch assembly 100 also includes a fixed frame 130, which includes a first clamping end plate 131 and a second clamping end plate 132, and a plurality of connecting rods 133 connecting the first clamping end plate 131 and the second clamping end plate 132; the plurality of connecting rods 133 are detachably connected to the first clamping end plate 131 and the second clamping end plate 132 to adjust the spacing between the first clamping end plate 131 and the second clamping end plate 132, and to confine the plurality of power units 110 cascaded in sequence between the first clamping end plate 131 and the second clamping end plate 132.

[0040] The multiple connecting rods 133 include at least four rod-shaped members, and both opposite ends of each connecting rod 133 are threaded. The first end of each connecting rod 133 is threadedly connected to the side of the first clamping end plate 131 close to the power unit 110, and the second end of the connecting rod 133 is threadedly connected to the second clamping end plate 132. In other words, the four connecting rods 133 are threadedly connected to the first clamping end plate 131 and the second clamping end plate 132 to form a fixed frame 130 with a rectangular structure.

[0041] Since the second end of the connecting rod 133 passes through the second clamping end plate 132, the second end of the connecting rod 133 needs to be tightened by a nut to adjust the tightening state between the connecting rods 133 and 133, and adjust the distance between the second clamping end plate 132 and the first clamping end plate 131.

[0042] Since the multiple power units 110 cascaded in sequence are located between the first clamping end plate 131 and the second clamping end plate 132, the distance between the second clamping end plate 132 and the first clamping end plate 131 can be adjusted, that is, the multiple power units 110 cascaded in sequence can be tightened and confined between the first clamping end plate 131 and the second clamping end plate 132.

[0043] As an example, the multiple power units 110 include a first power unit, a second power unit, a third power unit and a fourth power unit which are cascaded in sequence, and the first clamping end plate 131 is arranged at one end close to the first power unit, and the second clamping end plate 132 is arranged at one end close to the fourth power unit. Correspondingly, the multiple control units 200 include a first control unit, a second control unit, a third control unit and a fourth control unit, which are arranged on the first power unit, the second power unit, the third power unit and the fourth power unit in sequence, and are connected one by one, and are arranged opposite to the bypass switch tube of the corresponding power unit 110. The multiple DC capacitors 300 include a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, which are arranged on one side of the first power unit, the second power unit, the third power unit and the fourth power unit close to the first composite busbar 118 in sequence, and are connected one by one.

[0044] In some embodiments, the integrated switch assembly 100 also includes a second insulator 119 and a butterfly spring 120, the second insulator 119 is arranged between the first clamping end plate 131 and the first water-cooled radiator of the first-stage power unit 110, and the butterfly spring 120 is arranged between the second clamping end plate 132 and the first insulator 114 of the last-stage power unit 110.

[0045] By arranging the second insulator 119 between the first clamping end plate 131 and the first water-cooling radiator of the first-stage power unit 110, the multiple power units 110 cascaded in sequence can be electrically insulated from the fixed frame 130. By arranging the butterfly spring 120 between the second clamping end plate 132 and the first insulator 114 of the last-stage power unit 110, the butterfly spring 120 can adjust the pressure state of the multiple power units 110 between the first clamping end plate 131 and the second clamping end plate 132 during the process of adjusting the spacing between the second clamping end plate 132 and the first clamping end plate 131, and protect the power units 110.

[0046] According to a second aspect thereof, a compact flexible DC converter valve is provided, wherein the compact converter valve comprises the compact converter valve power component 10 described in any of the above embodiments.

[0047] In summary, the present application provides a compact flexible DC converter valve and its power components, including multiple power units 110, multiple control units 200 and multiple DC capacitors 300 connected in one-to-one correspondence; wherein each power unit 110 includes at least a water-cooled radiator 111, an IGBT switch tube 112, a thyristor 113 and a first insulator 114, and the number of water-cooled radiators 111 and IGBT switch tubes 112 includes multiple. By arranging multiple IGBT switch tubes 112, thyristors 113 and first insulators 114 in sequence and at intervals, and arranging multiple water-cooled radiators 111 in sequence and at intervals between adjacent IGBT switch tubes 112, adjacent IGBT switch tubes 112 and thyristors 113, and adjacent thyristors 113 and first insulators 114, and electrically connecting adjacent IGBT switch tubes 112 and adjacent IGBT switch tubes 112 and thyristors 113, the spatial distance between power units 110 is greatly reduced, and the amount of structural parts of the compact converter valve power component is saved, which has the characteristics of high operating reliability, compact space volume and light weight.

[0048] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A compact converter valve power assembly, characterized in that: It includes an integrated switch assembly, a plurality of control units and a plurality of DC capacitors; the integrated switch assembly includes a plurality of power units, and the plurality of power units are connected one-to-one with the plurality of control units and the plurality of DC capacitors; wherein, Each of the power units at least includes a water-cooled radiator, an IGBT switch tube, a thyristor and a first insulator; the number of the water-cooled radiator and the IGBT switch tube includes multiple, and the multiple IGBT switch tubes, the thyristors and the first insulator are arranged in sequence at intervals, and the multiple water-cooled radiators are arranged in sequence at intervals between adjacent IGBT switch tubes, adjacent IGBT switch tubes and the thyristors, and adjacent thyristors and the first insulator, electrically connecting adjacent IGBT switch tubes and adjacent IGBT switch tubes and the thyristors.

2. The power component according to claim 1, characterized in that: The multiple water-cooled radiators include a first water-cooled radiator, a second water-cooled radiator, a third water-cooled radiator and a fourth water-cooled radiator which are arranged in sequence at intervals; the multiple IGBT switching tubes include a first IGBT and a second IGBT, and the collector of the first IGBT is electrically connected to the first side of the first water-cooled radiator, the emitter of the first IGBT is electrically connected to the second side of the second water-cooled radiator, the collector of the second IGBT is electrically connected to the first side of the second water-cooled radiator, the emitter of the second IGBT is electrically connected to the second side of the third water-cooled radiator, the anode of the thyristor is electrically connected to the first side of the third water-cooled radiator, the cathode of the thyristor is electrically connected to the second side of the fourth water-cooled radiator, and the first insulator is connected to the first side of the fourth water-cooled radiator.

3. The power assembly according to claim 2, characterized in that: The power unit also includes a first AC output connection bar and a second AC output connection bar, the first AC output connection bar is crimped and fixed to the third side of the second water-cooled radiator, and the second AC output connection bar is crimped and fixed to the third side of the third water-cooled radiator.

4. The power assembly according to claim 2, characterized in that: The power unit also includes a first composite busbar and a bypass switch tube. The first composite busbar is respectively crimped and fixed to the first water-cooled radiator, the second water-cooled radiator, the third water-cooled radiator, the fourth side of the fourth water-cooled radiator, and the fourth side of the bypass switch tube and is electrically connected to make the bypass switch tube, the thyristor and the second IGBT connected in parallel with each other.

5. The power assembly according to claim 4, characterized in that: The first composite busbar is also provided with a plurality of connection terminals, and the DC capacitor is electrically connected to the corresponding power unit through the connection terminals.

6. The power assembly according to claim 1, characterized in that: The plurality of power units are cascaded in sequence, and the first insulator of the power unit of the previous stage is crimped and fixed to the second side surface of the water-cooled radiator of the power unit of the next stage.

7. The power assembly according to claim 6, characterized in that: The integrated switch assembly also includes a fixed frame, which includes a first clamping end plate and a second clamping end plate, and a plurality of connecting rods connecting the first clamping end plate and the second clamping end plate; the plurality of connecting rods are detachably connected to the first clamping end plate and the second clamping end plate to adjust the spacing between the first clamping end plate and the second clamping end plate, and to confine the plurality of power units cascaded in sequence between the first clamping end plate and the second clamping end plate.

8. The power assembly according to claim 7, characterized in that: The multiple connecting rods include at least four rod-shaped members with threads at both ends, and the two ends of each connecting rod are respectively threadedly connected to the first clamping end plate and the second clamping end plate. The four connecting rods and the first clamping end plate and the second clamping end plate together form the rectangular fixed frame.

9. The power assembly according to claim 7, characterized in that: The power assembly also includes a second insulator and a butterfly spring. The second insulator is arranged between the first clamping end plate and the water-cooled radiator of the first-level power unit, and the butterfly spring is arranged between the second clamping end plate and the first insulator of the last-level power unit.

10. A compact flexible DC converter valve, characterized in that: The converter valve comprises the compact converter valve power component according to any one of claims 1 to 9.

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