Hybrid converter and converter valve hall

Abstract

The invention discloses a hybrid converter and a converter valve hall. The hybrid converter comprises a first controllable turn-off bridge arm, a second three-end hybrid bridge arm, a fourth three-end hybrid bridge arm and a sixth three-end hybrid bridge arm, the first controllable turn-off bridge arm, the second three-end hybrid bridge arm, the fourth three-end hybrid bridge arm and the sixth three-end hybrid bridge arm are connected to form a first direct current output end and a first auxiliary direct current output end; a first controllable turn-off bridge arm, a second controllable turn-off bridge arm, a first three-end hybrid bridge arm, a third three-end hybrid bridge arm and a fifth three-end hybrid bridge arm; and the second controllable turn-off bridge arm, the first three-end hybrid bridge arm, the third three-end hybrid bridge arm and the fifth three-end hybrid bridge arm are connected to form a second direct current output end and an auxiliary direct current output second end. According to the hybrid converter, the full-control type converter bridge arms are shared, the usage amount of full-control type semiconductor devices is reduced to the greatest extent on the premise that the problem of commutation failure is solved, the overall cost of the converter is reduced, the reliability is improved, and the operation and maintenance workload is reduced.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology, and specifically relates to a hybrid converter and a converter valve hall. Background Art

[0002] Conventional high-voltage direct current transmission has been increasingly widely used at home and abroad due to its long transmission distance, large transmission energy, high reliability and low cost. The high-voltage direct current converter valve is the key equipment to achieve energy conversion. The conventional high-voltage direct current transmission converter valve is based on a semi-controlled thyristor. Although direct current technology is becoming more and more mature, there are still some problems. When the receiving end of direct current technology is connected to a weak alternating current system, it is easy to have a commutation failure problem when the alternating current system voltage is disturbed, especially in the current situation where a large amount of direct current is fed into the receiving end in a short distance, which seriously affects the stability of the receiving end power grid. To solve these problems, it is necessary to introduce fully-controlled semiconductor devices in DC converters. However, fully-controlled semiconductor devices currently have three disadvantages compared to semi-controlled devices: First, the power capacity of a single fully-controlled semiconductor device is lower than that of a semi-controlled device, and more semiconductor devices are needed to construct a converter of the same capacity; Second, fully-controlled semiconductor devices are more expensive than semi-controlled devices. The more fully-controlled semiconductor devices are used, the more the overall cost of the converter increases; Third, the failure rate of a single fully-controlled semiconductor device is higher than that of a semi-controlled device. The fewer fully-controlled semiconductor devices are used, the higher the overall reliability of the converter will be, and the smaller the workload of operation and maintenance will be. Summary of the invention

[0003] Purpose of the invention: The present application provides a hybrid converter and a converter valve hall, which are used to solve the problems of poor stability of the receiving-end power grid of DC technology and the more disadvantages of fully controlled semiconductor devices compared to semi-controlled devices.

[0004] Technical solution: The present application provides a hybrid converter, comprising: a first controllable off-bridge arm V 10 , the second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 ; The first controllable off bridge arm V 10 The second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 The first DC output terminal P and the first auxiliary DC output terminal P are connected to form a first DC output terminal P 10 ; The second controllable off bridge arm V 20 、The first three-terminal hybrid bridge arm V 11 、The third three-terminal hybrid bridge arm V 33 And the fifth three-terminal hybrid bridge arm V 55 ; The second controllable off bridge arm V 20, the first three-terminal hybrid bridge arm V 11 , the third three-terminal hybrid bridge arm V 33 , the fifth three-terminal hybrid bridge arm V 55 The second DC output terminal N and the second auxiliary DC output terminal N are connected to form a second DC output terminal N 10 .

[0005] In some embodiments, the fourth three-terminal hybrid bridge arm V 44 , the first three-terminal hybrid bridge arm V 11 connected to form a first AC output terminal A; the sixth three-terminal hybrid bridge arm V 66 The third three-terminal hybrid bridge arm V 33 connected to form a second AC output terminal B; the second three-terminal hybrid bridge arm V 22 With the fifth three-terminal hybrid bridge arm V 55 The third AC output terminal C is formed by connection.

[0006] In some embodiments, the second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 Any one of them includes: the third controllable off bridge arm V 100 , the third controllable shutdown bridge arm V 100 It includes a first DC output terminal P; a non-controllable off bridge arm V 120 , the uncontrollable off bridge arm V 120 Including a third terminal T, the third controllable shutoff bridge arm V 100 With the uncontrolled off bridge arm V 120 The two terminals are connected to form a second DC output terminal N.

[0007] In some embodiments, the first three-terminal hybrid bridge arm V 11 , the third three-terminal hybrid bridge arm V 33 and the fifth three-terminal hybrid bridge arm V 55 Any one of them includes: the third controllable off bridge arm V 100 , the third controllable shutdown bridge arm V 100 Including a second DC output terminal N; a non-controllable shut-off bridge arm V 120 , the uncontrollable off bridge arm V 120 Including a third terminal T, the non-controllable off bridge arm V 120 The third controllable off bridge arm V 100 The first DC output terminal P is connected.

[0008] In some embodiments, the first controllable off bridge arm V 10 , the second controllable off bridge arm V 20 and the third controllable off bridge arm V100 Any one of them includes: at least one level of power semiconductor device with controllable shutdown capability; or, at least one level of power semiconductor device with controllable shutdown capability and at least one level of uncontrollable shutdown power semiconductor connected.

[0009] In some embodiments, the power semiconductor device with controllable shutdown capability includes an IGBT and / or an IGCT; and / or, the uncontrollable shutdown power semiconductor includes an uncontrollable shutdown power semiconductor thyristor and / or an uncontrollable shutdown power semiconductor diode.

[0010] In some embodiments, the first controllable off bridge arm V 10 , the second controllable off bridge arm V 20 and the third controllable off bridge arm V 100 Any one of the above includes: an overvoltage energy limiting device, which is connected in parallel with the power semiconductor device with controllable shutdown capability; wherein the overvoltage energy limiting device is a metal zinc oxide lightning arrester.

[0011] In some embodiments, the uncontrollable off bridge arm V 120 It includes: at least one diode with uncontrolled turn-off capability, at least one diode with uncontrolled turn-off capability connected in series and / or in parallel; or, at least one thyristor with uncontrolled turn-off capability, at least one thyristor with uncontrolled turn-off capability connected in series and / or in parallel; or, at least one thyristor with uncontrolled turn-off capability and at least one uncontrolled turn-off power semiconductor diode connected in series.

[0012] The present application also provides a converter valve hall, comprising the hybrid converter as described above, and further comprising: a normal converter valve tower, the second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 The second valves are respectively arranged on the normal converter valve tower, the first three-terminal hybrid bridge arm V 11 , the third three-terminal hybrid bridge arm V 33 and the fifth three-terminal hybrid bridge arm V 55 The first valves are respectively arranged on the normal converter valve tower; the first controllable shut-off bridge arm V of the special converter valve tower 10 The first valve arranged on the special converter valve tower, the second controllable shut-off bridge arm V 20 A second valve is arranged on the special converter valve tower.

[0013] In some embodiments, the first valve and the second valve of the normal converter valve tower each include multiple valve layers, the valve layers include controllable shut-off valve sections and uncontrollable shut-off valve sections, the controllable shut-off valve sections in different valve layers are connected in series end to end, and the uncontrollable shut-off valve sections in different valve layers are connected in series end to end.

[0014] Beneficial effect: Compared with the prior art, in the hybrid converter of the present invention, the first DC output and the first auxiliary DC output terminal are formed by connecting the first controllable shutdown bridge arm, the second three-terminal hybrid bridge arm, the fourth three-terminal hybrid bridge arm, and the sixth three-terminal hybrid bridge arm; the second DC output terminal and the auxiliary DC output second terminal are formed by connecting the second controllable shutdown bridge arm, the first three-terminal hybrid bridge arm, the third three-terminal hybrid bridge arm, and the fifth three-terminal hybrid bridge arm. The hybrid converter of the present invention realizes the sharing of the fully controlled commutation bridge arm, and on the premise of ensuring the solution of the commutation failure problem, the use of fully controlled semiconductor devices is minimized, the overall cost of the converter is reduced, the reliability is improved, and the operation and maintenance workload is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of a hybrid converter according to an embodiment of the present application;

[0017] Figure 2 This is a schematic diagram of the structure of the upper bridge arm group composed of a three-terminal hybrid bridge arm in an embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the structure of a lower bridge arm group composed of a three-terminal hybrid bridge arm in an embodiment of the present application;

[0019] Figure 4a to Figure 4l They are schematic diagrams of the structures of the controllable shutdown bridge arms in various embodiments of the present application;

[0020] Figure 5a to Figure 5c They are schematic diagrams of the structures of the non-controllable shutdown bridge arms in various embodiments of the present application;

[0021] Figure 6 This is a schematic structural diagram of a converter valve hall according to the first embodiment of the present application;

[0022] Figure 7 This is a schematic structural diagram of a converter valve hall according to a second embodiment of the present application; DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0025] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0026] See also Figure 1 , Figure 1 The hybrid converter valve provided in the present application includes: a first DC output terminal P, a second DC output terminal N, a first auxiliary DC output terminal P 10 , the second auxiliary DC output terminal N 10 , the first AC output terminal A, the second AC output terminal B, the third AC output terminal C, the first controllable shutdown bridge arm V 10 , the second controllable shutdown bridge arm V 20 , a first bridge arm group and a second bridge arm group, the first bridge arm group including a second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 The second bridge arm group includes a first three-terminal hybrid bridge arm V 11 、The third three-terminal hybrid bridge arm V 33 And the fifth three-terminal hybrid bridge arm V 55 ; Among them, the second three-terminal hybrid bridge arm V 22, the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 Connect to form the first bridge arm group, the first three-terminal hybrid bridge arm V 11 、The third three-terminal hybrid bridge arm V 33 And the fifth three-terminal hybrid bridge arm V 55 The two bridge arms are connected to form a second bridge arm group.

[0027] like Figure 1 As shown, the first controllable off-bridge arm V 10 One end, the second three-end hybrid bridge arm V 22 The first end, the fourth end and the third end of the hybrid bridge arm V 44 The first end, the sixth three-end hybrid bridge arm V 66 The first end of the first controllable off bridge arm V is connected to form a first DC output terminal P; 10 The other end of the second three-terminal hybrid bridge arm V 22 The second end, the fourth end and the third end of the hybrid bridge arm V 44 The second end and the sixth three-end mixed bridge arm V 66 The second end of the first auxiliary DC output terminal P 10 ; The fourth three-terminal hybrid bridge arm V 44 The third end of the first three-terminal hybrid bridge arm V 11 The first end of the sixth three-terminal hybrid bridge arm V 66 The third end and the third three-terminal mixed bridge arm V 33 The first end of the hybrid bridge arm V 22 The third end and the fifth three-end mixed bridge arm V 55 The first end is connected to form a third AC output terminal C;

[0028] The second controllable off bridge arm V 20 The first end, the first three-terminal hybrid bridge arm V 11 The second and third ends of the hybrid bridge arm V 33 The second end, the fifth three-end hybrid bridge arm V 55 The second end of the auxiliary DC output terminal N 10 ; The second controllable off bridge arm V 20 The second end of the first three-terminal hybrid bridge arm V 11 The third end, the third three-end mixed bridge arm V 33 The third end and the fifth three-end mixed bridge arm V 55 The third end of is connected to form a second DC output terminal N.

[0029] See also Figure 2 , Figure 2is a schematic diagram of the structure of the first bridge arm group in the embodiment of the present application as a three-terminal hybrid bridge arm. In some embodiments of the present application, the second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 Any of the following includes: Uncontrolled shutdown bridge arm V 120 and the third controllable off-bridge arm V 100 ; The third controllable off bridge arm V 100 One end is the first DC output terminal P of the three-terminal hybrid bridge arm, and the non-controllable shutdown bridge arm V 120 One end of the three-terminal hybrid bridge arm is the third end T, and the third controllable shutoff bridge arm V 100 The other end is connected to the uncontrolled off bridge arm V 120 The other end is connected to the second DC output terminal N forming a three-terminal hybrid bridge arm.

[0030] See also Figure 3 , Figure 3 1 is a schematic diagram of the structure of the second bridge arm group as a three-terminal hybrid bridge arm in the embodiment of the present application. 11 、The third three-terminal hybrid bridge arm V 33 With the fifth three-terminal hybrid bridge arm V 55 Any of the following includes: Uncontrolled shutdown bridge arm V 120 and the third controllable off bridge arm V 100 , the third controllable shutdown bridge arm V 100 One end of the bridge arm V 120 One end of the bridge arm is connected to form the first DC output terminal P of the three-terminal hybrid bridge arm, and the non-controllable off-bridge arm V 120 The other end is the third end T of the three-terminal hybrid bridge arm, and the third controllable shutoff bridge arm V 100 The other end is the second DC output end N of the three-terminal hybrid bridge arm.

[0031] See also Figure 4a to Figure 4l , Figure 4l 12 schematic diagrams of controllable off bridge arms in the embodiment of the present application. In the embodiment of the present application, the first controllable off bridge arm V 10 , the second controllable shutdown bridge arm V 20 and the third controllable off bridge arm V 100 Any one of which includes: at least one power semiconductor device with controllable shutoff capability; or a first controllable shutoff bridge arm V 10 , the second controllable shutdown bridge arm V 20 and the third controllable off bridge arm V 100Any one of the above includes: at least one level of power semiconductor device with controllable shutdown capability, at least one level of uncontrollable shutdown power semiconductor, at least one level of power semiconductor device with controllable shutdown capability is connected to at least one level of uncontrollable shutdown power semiconductor; the power semiconductor device with controllable shutdown capability can be connected in parallel with the overvoltage energy limiting device; and the power semiconductor device with controllable shutdown capability includes at least one of IGBT and IGCT; and / or the uncontrollable shutdown power semiconductor includes at least one of uncontrollable shutdown power semiconductor thyristor and uncontrollable shutdown power semiconductor diode.

[0032] Furthermore, the first controllable off-bridge arm V 10 , the second controllable shutdown bridge arm V 20 and the third controllable off bridge arm V 100 Any one of them also includes an overvoltage energy limiting device, which is connected in parallel with a power semiconductor device with a controllable shutdown capability; the overvoltage energy limiting device is a metal zinc oxide lightning arrester.

[0033] The following are respectively Figure 4a to Figure 4l The structure of the controllable shutdown bridge arm is described in detail.

[0034] like Figure 4a As shown, the controllable shutdown bridge arm includes: at least one level of IGBT with controllable shutdown capability; the IGBTs are connected in series and parallel.

[0035] like Figure 4b As shown, the controllable shutdown bridge arm includes: at least one level of IGCT with controllable shutdown capability; the IGCTs are connected in series and parallel.

[0036] like Figure 4c As shown, the controllable shutdown bridge arm includes: at least one IGBT with controllable shutdown capability and at least one non-controllable shutdown power semiconductor diode, which are connected in series; and then at least one group of IGBTs and diode components are connected in parallel.

[0037] like Figure 4d As shown, the controllable shutdown bridge arm includes: at least one IGCT with controllable shutdown capability and at least one non-controllable shutdown power semiconductor diode, which are connected in series; and then at least one group of IGCTs is connected in parallel with the diode assembly.

[0038] like Figure 4e As shown, the controllable shutdown bridge arm includes: at least one level of IGBT with controllable shutdown capability and at least one level of uncontrollable shutdown power semiconductor thyristor, which are connected in series; and then at least one group of IGBT and thyristor components are connected in parallel.

[0039] like Figure 4fAs shown, the controllable shutdown bridge arm includes: at least one level of IGCT with controllable shutdown capability and at least one level of uncontrollable shutdown power semiconductor thyristor, which are connected in series; and then at least one group of IGCT is connected in parallel with the thyristor assembly.

[0040] like Figure 4g As shown, the controllable shutdown bridge arm includes: at least one IGBT with controllable shutdown capability, at least one uncontrollable shutdown power semiconductor thyristor, and at least one uncontrollable shutdown power semiconductor diode, which are connected in series; and then at least one group of IGBT, thyristor and diode components are connected in parallel.

[0041] like Figure 4h As shown, the controllable shutdown bridge arm has a first output end and a second output end, and the controllable shutdown bridge arm includes: at least one level of non-controllable shutdown power semiconductor thyristor, at least one level of IGBT with controllable shutdown capability, and at least one level of non-controllable shutdown power semiconductor diode; wherein, one end of at least one level of non-controllable shutdown power semiconductor thyristor is the first output end; the other end of at least one level of non-controllable shutdown power semiconductor thyristor, one end of at least one level of IGBT with controllable shutdown capability, and one end of at least one level of non-controllable shutdown power semiconductor thyristor are connected, the other end of at least one level of IGBT with controllable shutdown capability is connected to one end of at least one level of non-controllable shutdown power semiconductor diode, and the other end of at least one level of non-controllable shutdown power semiconductor diode is connected to the other end of at least one level of non-controllable shutdown power semiconductor thyristor to form the second output end.

[0042] like Figure 4i As shown, the controllable shutdown bridge arm of the present application has a first output end and a second output end, and the controllable shutdown bridge arm includes: at least one level of non-controllable shutdown power semiconductor thyristor, IGCT, at least one level of non-controllable shutdown power semiconductor diode, and at least one other level of non-controllable shutdown power semiconductor thyristor; wherein, one end of at least one level of non-controllable shutdown power semiconductor thyristor serves as the first output end; and, the other end of at least one level of non-controllable shutdown power semiconductor thyristor, one end of at least one level of IGCT with controllable shutdown capability, and one end of at least one other level of non-controllable shutdown power semiconductor thyristor are connected; and, the other end of at least one level of IGCT with controllable shutdown capability and one end of at least one level of non-controllable shutdown power semiconductor diode are connected; and, the other end of at least one level of non-controllable shutdown power semiconductor diode is connected to the other end of at least one other level of non-controllable shutdown power semiconductor thyristor to form a second output end.

[0043] like Figure 4jAs shown, the controllable shutdown bridge arm of the present application has a first output end and a second output end; the controllable shutdown bridge arm includes: at least one level of non-controllable shutdown power semiconductor thyristor, an overvoltage energy limiting unit, at least one level of IGBT with controllable shutdown capability, another at least one level of non-controllable shutdown power semiconductor thyristor, and at least one level of non-controllable shutdown power semiconductor diode; wherein, one end of the at least one level of non-controllable shutdown power semiconductor thyristor is the first output end; and, the other end of the at least one level of non-controllable shutdown power semiconductor thyristor, one end of the overvoltage energy limiting unit, one end of the at least one level of IGBT with controllable shutdown capability, and one end of the at least one level of non-controllable shutdown power semiconductor thyristor are connected; and, the other end of the at least one level of IGBT with controllable shutdown capability, the other end of the overvoltage energy limiting unit, and one end of the at least one level of non-controllable shutdown power semiconductor diode are connected; and, the other end of the at least one level of non-controllable shutdown power semiconductor diode and the other end of the at least one level of non-controllable shutdown power semiconductor thyristor are connected to form the second output end.

[0044] See also Figure 4k The controllable shutdown bridge arm in the embodiment of the present application has a first output end and a second output end, and the controllable shutdown bridge arm includes: at least one level of non-controllable shutdown power semiconductor thyristor, an overvoltage energy limiting unit, at least one level of IGCT with controllable shutdown capability, another at least one level of non-controllable shutdown power semiconductor thyristor, and at least one level of non-controllable shutdown power semiconductor diode; wherein, one end of the at least one level of non-controllable shutdown power semiconductor thyristor is the first output end; and, the other end of the at least one level of non-controllable shutdown power semiconductor thyristor, one end of the overvoltage energy limiting unit, one end of the at least one level of IGCT with controllable shutdown capability, and one end of the at least one level of non-controllable shutdown power semiconductor thyristor are connected; and, the other end of the at least one level of IGCT with controllable shutdown capability, the other end of the overvoltage energy limiting unit, and one end of the at least one level of non-controllable shutdown power semiconductor diode are connected; and, the other end of the at least one level of non-controllable shutdown power semiconductor diode and the other end of the at least one level of non-controllable shutdown power semiconductor thyristor are connected to form the second output end.

[0045] See also Figure 4l The controllable shutdown bridge arm in the embodiment of the present application has a first output end and a second output end, and the controllable shutdown bridge arm includes: at least one IGBT with controllable shutdown capability, at least one other IGBT with controllable shutdown capability, and a capacitor; wherein, one end of at least one IGBT with controllable shutdown capability is connected to one end of the capacitor, and the other end of at least one IGBT with controllable shutdown capability is connected to one end of another at least one IGBT with controllable shutdown capability to form a first output end; the other end of another at least one IGBT with controllable shutdown capability is connected to the other end of the capacitor to form a second output end.

[0046] See also Figure 5a to Figure 5c , Figure 5a This is a schematic diagram of the structure of a non-controllable shutdown bridge arm in an embodiment of the present application; Figure 5b This is a schematic diagram of the structure of the non-controllable shutdown bridge arm in another embodiment of the present application; Figure 5c 1 is a schematic diagram of the structure of an uncontrolled turn-off bridge arm in another embodiment of the present application. In the embodiment of the present application, the uncontrolled turn-off bridge arm includes an uncontrolled turn-off power semiconductor, and the uncontrolled turn-off power semiconductor includes: a diode with at least one level of uncontrolled turn-off capability, and / or, a thyristor with at least one level of uncontrolled turn-off capability.

[0047] like Figure 5a In the embodiment, the uncontrollable turn-off bridge arm is formed by connecting diodes with at least one level of uncontrollable turn-off capability in series and in parallel.

[0048] like Figure 5b In the embodiment, the uncontrollable turn-off bridge arm is formed by connecting thyristors in series and in parallel with at least one level of uncontrollable turn-off capability.

[0049] like Figure 5c In the embodiment, the uncontrollable shutdown bridge arm includes: at least one level of thyristor with uncontrollable shutdown capability, at least one level of uncontrollable shutdown power semiconductor diode, the two are connected in series; and then at least one group of thyristor with uncontrollable shutdown capability is connected in parallel with the diode component.

[0050] See also Figure 6 , Figure 6 The diagram is a schematic diagram of the structure of a converter valve hall provided in the present application. The converter valve hall includes: three normal converter valve towers, the hybrid converters are arranged in the converter valve hall through suspension insulators, and the six three-terminal hybrid bridge arms of the hybrid converter are arranged on the three normal converter valve towers; wherein the first three-terminal hybrid bridge arm V 11 、The third three-terminal hybrid bridge arm V 33 、The fifth three-terminal hybrid bridge arm V 55 The lower valves of the three normal converter valve towers are arranged respectively, and the second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 、The sixth three-terminal hybrid bridge arm V 66 The upper valves are arranged on the three normal converter valve towers respectively; the valve towers connected to the DC side and the auxiliary DC side are all special converter valve towers, and the first controllable shut-off bridge arm V 10 The upper valve arranged on the special converter valve tower, the second controllable shut-off bridge arm V 20The lower valve is arranged in a special converter valve tower; four valve towers are arranged horizontally, and different valve layers are arranged vertically in each valve tower, and the valve layers are connected and fixed by hanging insulators. Each valve layer in the three normal converter valve towers contains: controllable shut-off valve sections and uncontrollable shut-off valve sections, and the controllable shut-off valve sections and uncontrollable shut-off valve sections are arranged in parallel; the controllable shut-off valve sections in different layers of the upper bridge arm and the lower bridge arm are electrically connected end to end to form a series structure, and the uncontrollable shut-off valve sections in different layers of the upper bridge arm and the lower bridge arm are electrically connected end to end to form a series structure.

[0051] like Figure 6 As shown, the head end of the controllable shut-off valve section of the first layer of the lower valve of the converter valve, the controllable shut-off valve bottom shielding cover, one end of the arrester of the lower valve of the converter and the first DC output terminal N are connected; the end of the controllable shut-off valve section of the first layer of the lower valve of the converter valve and the head end of the controllable shut-off valve section of the second layer of the upper valve of the converter valve are connected; the end of the controllable shut-off valve section of the second layer of the upper valve of the converter valve and the head end of the controllable shut-off valve section of the third layer of the upper valve of the converter valve are connected until the end of the controllable shut-off valve section of the Nth layer of the upper valve of the converter valve is connected.

[0052] like Figure 6 As shown, the first end of the non-controllable shut-off valve section of the first layer of the lower valve of the converter valve, the bottom shielding cover of the non-controllable shut-off valve, the second auxiliary DC output terminal N 10 The end of the non-controlled shut-off valve section of the first layer of the lower valve of the converter valve and the beginning of the non-controlled shut-off valve section of the second layer of the upper valve of the converter valve are connected; the end of the non-controlled shut-off valve section of the second layer of the upper valve of the converter valve and the beginning of the non-controlled shut-off valve section of the third layer of the upper valve of the converter valve are connected until the end of the non-controlled shut-off valve section of the Nth layer of the upper valve of the converter valve is connected.

[0053] like Figure 6 As shown, the end of the controllable shut-off valve section of the Nth layer on the upper valve of the converter valve, the end of the uncontrollable shut-off valve section of the Nth layer on the upper valve of the converter valve, the other end of the arrester of the lower valve of the converter, one end of the arrester of the upper valve of the converter, the head end of the controllable shut-off valve section of the first layer on the upper valve of the converter valve, and the head end of the uncontrollable shut-off valve section of the first layer on the upper valve of the converter valve are connected to a single-phase AC side AC.

[0054] like Figure 6 As shown, the end of the controllable shut-off valve section of the first layer of the upper valve of the converter valve and the beginning of the controllable shut-off valve section of the second layer of the upper valve of the converter valve are connected; the end of the controllable shut-off valve section of the second layer of the upper valve of the converter valve and the beginning of the controllable shut-off valve section of the third layer of the upper valve of the converter valve are connected until the end of the controllable shut-off valve section of the Nth layer of the upper valve of the converter valve is connected; the end of the controllable shut-off valve section of the Nth layer of the upper valve of the converter valve, the controllable shut-off valve top shielding cover, the other end of the arrester of the upper valve of the converter, and the first DC output terminal P are connected.

[0055] like Figure 6As shown, the end of the non-controlled shut-off valve section of the first layer of the upper valve of the converter valve and the head end of the non-controlled shut-off valve section of the second layer of the upper valve of the converter valve are connected; the end of the non-controlled shut-off valve section of the second layer of the upper valve of the converter valve and the head end of the non-controlled shut-off valve section of the third layer of the upper valve of the converter valve are connected until the end of the non-controlled shut-off valve section of the Nth layer of the upper valve of the converter valve is connected; the end of the non-controlled shut-off valve section of the Nth layer of the upper valve of the converter valve, the non-controlled shut-off valve top shielding cover, and the first auxiliary DC output terminal P 10 are connected.

[0056] like Figure 6 As shown, the first controllable shut-off bridge arm V in the special converter valve tower 10 With the second controllable off bridge arm V 20 It is composed of controllable shut-off valve sections electrically connected end to end.

[0057] like Figure 6 As shown, the head end of the controllable shut-off valve section of the first layer of the special converter valve tower lower valve, the bottom shielding cover, and the first DC output terminal N are connected; the end of the controllable shut-off valve section of the first layer of the special converter valve tower lower valve and the head end of the controllable shut-off valve section of the second layer of the special converter valve tower lower valve are connected; the end of the controllable shut-off valve section of the second layer of the special converter valve tower lower valve and the head end of the controllable shut-off valve section of the third layer of the special converter valve tower lower valve are connected until the end of the controllable shut-off valve section of the Nth layer of the special converter valve tower lower valve is connected; the end of the controllable shut-off valve section of the Nth layer of the special converter valve tower lower valve is connected to the second auxiliary DC output terminal N. 10 connected.

[0058] like Figure 6 As shown, the head end of the controllable shut-off valve section of the Nth layer of the special converter valve tower, the first auxiliary DC output terminal P 10 The controllable shut-off valve section of the first layer on the special converter valve tower is connected to the head end of the controllable shut-off valve section of the second layer on the special converter valve tower; the controllable shut-off valve section of the second layer on the special converter valve tower is connected to the head end of the controllable shut-off valve section of the third layer on the special converter valve tower, until the end of the controllable shut-off valve section of the Nth layer on the special converter valve tower is connected; the end of the controllable shut-off valve section of the Nth layer on the special converter valve tower is connected to the top shielding cover and the first DC output terminal P.

[0059] See also Figure 7 , Figure 7 : is a schematic diagram of a converter valve hall in another embodiment of the present application. The converter valve hall includes three normal converter valve towers and a special converter valve tower. The hybrid converter is arranged in phases in the converter valve hall through suspension insulators. The six three-terminal hybrid bridge arms of the hybrid converter are arranged in the three normal converter valve towers. The hybrid converter is arranged in phases in the converter valve hall through suspension insulators. The six three-terminal hybrid bridge arms are arranged in the three normal converter valve towers. The first three-terminal hybrid bridge arm V 11、The third three-terminal hybrid bridge arm V 33 、The fifth three-terminal hybrid bridge arm V 55 The first valve arranged on the three normal converter valve towers is denoted as the lower valve, and the second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 、The sixth three-terminal hybrid bridge arm V 66 The second valve arranged on the three normal converter valve towers is recorded as the upper valve, and the three normal converter valve towers are arranged horizontally; the valve tower connected to the DC side and the auxiliary DC side is a special converter valve tower, which is arranged on the ground through supporting insulators.

[0060] The hybrid converter and the converter valve hall of the present invention form a first DC output and a first auxiliary DC output terminal through the first controllable shutoff bridge arm, the second three-terminal hybrid bridge arm, the fourth three-terminal hybrid bridge arm, and the sixth three-terminal hybrid bridge arm; and form a second DC output terminal and an auxiliary DC output second terminal through the second controllable shutoff bridge arm, the first three-terminal hybrid bridge arm, the third three-terminal hybrid bridge arm, and the fifth three-terminal hybrid bridge arm. The hybrid converter of the present invention realizes the sharing of the fully controlled converter bridge arm, and on the premise of ensuring the solution of the commutation failure problem, the use of fully controlled semiconductor devices is minimized, the overall cost of the converter is reduced, the reliability is improved, and the operation and maintenance workload is reduced.

[0061] The hybrid converter valve and converter valve hall provided in the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the present invention are explained by using specific examples in the present invention. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid inverter, characterized in that: include: The first controllable off bridge arm V 10 , the second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 ; The first controllable off bridge arm V 10 The second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 The first DC output terminal P and the first auxiliary DC output terminal P are connected to form a first DC output terminal P 10 ; The second controllable off bridge arm V 20 、The first three-terminal hybrid bridge arm V 11 、The third three-terminal hybrid bridge arm V 33 And the fifth three-terminal hybrid bridge arm V 55 ; The second controllable off bridge arm V 20 , the first three-terminal hybrid bridge arm V 11 , the third three-terminal hybrid bridge arm V 33 , the fifth three-terminal hybrid bridge arm V 55 The second DC output terminal N and the second auxiliary DC output terminal N are connected to form a second DC output terminal N 10 .

2. The hybrid inverter according to claim 1, characterized in that: The fourth three-terminal hybrid bridge arm V 44 , the first three-terminal hybrid bridge arm V 11 connected to form a first AC output terminal A; the sixth three-terminal hybrid bridge arm V 66 The third three-terminal hybrid bridge arm V 33 connected to form a second AC output terminal B; the second three-terminal hybrid bridge arm V 22 With the fifth three-terminal hybrid bridge arm V 55 The third AC output terminal C is formed by connection.

3. The hybrid inverter according to claim 1, characterized in that: The second three-terminal hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 Any of which includes: The third controllable off bridge arm V 100 , the third controllable off bridge arm V 100 comprising a first DC output terminal P; Uncontrolled shutdown bridge arm V 120 , the uncontrollable off bridge arm V 120 Including a third terminal T, the third controllable shutoff bridge arm V 100 With the uncontrolled off bridge arm V 120 The two terminals are connected to form a second DC output terminal N.

4. The hybrid inverter according to claim 1, characterized in that: The first three-terminal hybrid bridge arm V 11 , the third three-terminal hybrid bridge arm V 33 and the fifth three-terminal hybrid bridge arm V 55 Any of which includes: The third controllable off bridge arm V 100 , the third controllable off bridge arm V 100 comprising a second DC output terminal N; Uncontrolled shutdown bridge arm V 120 , the uncontrollable off bridge arm V 120 Including the third terminal T, the non-controllable off bridge arm V 120 The third controllable off bridge arm V 100 The first DC output terminal P is connected.

5. The hybrid inverter according to claim 3 or 4, characterized in that: The first controllable off bridge arm V 10 , the second controllable off bridge arm V 20 and the third controllable off bridge arm V 100 Any of which includes: At least one power semiconductor device with controllable shutdown capability; or, At least one level of power semiconductor device with controllable shutdown capability and at least one level of uncontrollable shutdown power semiconductor connected to each other.

6. The hybrid inverter according to claim 5, characterized in that: The power semiconductor device with controllable shutdown capability includes any one of IGBT and IGCT; and / or, The uncontrollably turned-off power semiconductor includes at least one of an uncontrollably turned-off power semiconductor thyristor and an uncontrollably turned-off power semiconductor diode.

7. The hybrid inverter according to claim 5, characterized in that: The first controllable off bridge arm V 10 , the second controllable off bridge arm V 20 and the third controllable off bridge arm V 100 Any of which includes: An overvoltage energy limiting device, the overvoltage energy limiting device being connected in parallel with the power semiconductor device having a controllable shutdown capability; Wherein, the overvoltage energy limiting device is a metal zinc oxide arrester.

8. The hybrid inverter according to claim 3 or 4, characterized in that: The uncontrollable off bridge arm V 120 include: At least one diode with uncontrolled turn-off capability, at least one diode with uncontrolled turn-off capability connected in series and / or in parallel; or, At least one thyristor with an uncontrolled turn-off capability, at least one thyristor with an uncontrolled turn-off capability connected in series and / or in parallel; or, At least one level of thyristor with uncontrollable turn-off capability and at least one level of uncontrollable turn-off power semiconductor diode are connected in series.

9. A converter valve hall, characterized in that: The hybrid converter according to any one of claims 1 to 8 further comprises: Normal converter valve tower, the second and third end hybrid bridge arm V 22 , the fourth three-terminal hybrid bridge arm V 44 and the sixth three-terminal hybrid bridge arm V 66 The second valves are respectively arranged on the normal converter valve tower, the first three-terminal hybrid bridge arm V 11 , the third three-terminal hybrid bridge arm V 33 and the fifth three-terminal hybrid bridge arm V 55 First valves respectively arranged on the normal converter valve towers; Special converter valve tower, the first controllable shut-off bridge arm V 10 The first valve arranged on the special converter valve tower, the second controllable shut-off bridge arm V 20 A second valve is arranged on the special converter valve tower.

10. The converter valve hall according to claim 9, characterized in that: The first valve and the second valve of the normal converter valve tower each include a plurality of valve layers, wherein the valve layers include controllable shut-off valve sections and uncontrollable shut-off valve sections, the controllable shut-off valve sections of adjacent valve layers are connected in series end to end, and the uncontrollable shut-off valve sections of adjacent valve layers are connected in series end to end.

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