Hybrid converter and converter valve hall

Abstract

This invention discloses a hybrid converter and a converter valve hall. The hybrid converter includes: a first controllable shut-off bridge arm, a second three-terminal hybrid bridge arm, a fourth three-terminal hybrid bridge arm, and a sixth three-terminal hybrid bridge arm; the first controllable shut-off bridge arm, the second three-terminal hybrid bridge arm, the fourth three-terminal hybrid bridge arm, and the sixth three-terminal hybrid bridge arm are connected to form a first DC output terminal and a first auxiliary DC output terminal; the second controllable shut-off bridge arm, the first three-terminal hybrid bridge arm, the third three-terminal hybrid bridge arm, and the fifth three-terminal hybrid bridge arm are connected to form a second DC output terminal and a second auxiliary DC output terminal. This hybrid converter achieves shared use of fully controllable converter bridge arms, ensuring that the commutation failure problem is solved, while minimizing the use of fully controllable semiconductor devices, reducing the overall cost of the converter, improving reliability, and reducing the workload of operation and maintenance.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, specifically relating to a hybrid converter and a converter valve chamber. Background Technology

[0002] Conventional high-voltage direct current (HVDC) transmission is increasingly widely used both domestically and internationally due to its long transmission distance, large energy capacity, high reliability, and low cost. HVDC converter valves are key equipment for energy conversion, and conventional HVDC converter valves are based on semi-controlled thyristors. Although DC technology is becoming increasingly mature, some problems still exist. When the receiving end of a DC system is connected to a weak AC system, commutation failures are prone to occur during AC system voltage disturbances. This is particularly problematic given the current situation of large-scale short-distance DC feeds into the receiving end's vicinity, severely impacting the stability of the receiving end's power grid. To address these issues, fully controlled semiconductor devices need to be introduced into 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, requiring more semiconductor devices to construct a converter of the same capacity; second, fully controlled semiconductor devices are more expensive than semi-controlled devices, and the more fully controlled semiconductor devices used, the greater the increase in the overall cost of the converter; third, the failure rate of a single fully controlled semiconductor device is higher than that of a semi-controlled device, and the fewer fully controlled semiconductor devices used, the higher the overall reliability of the converter and the less workload required for operation and maintenance. Summary of the Invention

[0003] Purpose of the invention: This application provides a hybrid converter and converter valve chamber to solve the problems of poor grid stability at the receiving end of DC technology and the many drawbacks of fully controlled semiconductor devices compared to semi-controlled devices.

[0004] Technical solution: This application provides a hybrid converter, including: a first controllable turn-off arm V 10 Second and third end hybrid bridge arm V 22 Fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The first controllable shut-off bridge arm V 10 The second and third-terminal hybrid bridge arm V 22 The fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The connection forms a first DC output terminal P and a first auxiliary DC output terminal P. 10 Second controllable shut-off bridge arm V 20 First three-terminal hybrid bridge arm V 11 The third three-terminal hybrid bridge arm V 33 and the fifth three-end hybrid bridge arm V 55 The second controllable shut-off bridge arm V 20The 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 connection forms a second DC output terminal N and a second auxiliary 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 The connection forms the first AC output terminal A; the sixth three-terminal hybrid bridge arm V 66 With the third three-terminal hybrid bridge arm V 33 The connection forms the second AC output terminal B; the second three-terminal hybrid bridge arm V 22 With the fifth three-end hybrid bridge arm V 55 Connect to form the third AC output terminal C.

[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-end hybrid bridge arm V 66 Any of the following includes: the third controllable shut-off arm V 100 The third controllable shut-off bridge arm V 100 Includes the first DC output terminal P; and the non-controllable turn-off bridge arm V. 120 The uncontrollable shut-off bridge arm V 120 Including the third terminal T, the third controllable shut-off bridge arm V 100 With the uncontrollable shut-off bridge arm V 120 Connect to form the 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 of the following includes: the third controllable shut-off arm V 100 The third controllable shut-off bridge arm V 100 Includes the second DC output terminal N; and the non-controllable turn-off bridge arm V. 120 The uncontrollable shut-off bridge arm V 120 Including the third terminal T, the uncontrollable shut-off bridge arm V 120 With the third controllable shut-off bridge arm V 100 The connection forms the first DC output terminal P.

[0008] In some embodiments, the first controllable shut-off arm V 10 The second controllable shut-off bridge arm V 20 and the third controllable shut-off bridge arm V100 Any one of them includes: at least one power semiconductor device with controllable turn-off capability; or, at least one power semiconductor device with controllable turn-off capability and at least one power semiconductor device without controllable turn-off capability connected together.

[0009] In some embodiments, the power semiconductor device with controllable turn-off capability includes IGBTs and / or IGCTs; and / or, the uncontrollable turn-off power semiconductor includes uncontrollable turn-off power semiconductor thyristors and / or uncontrollable turn-off power semiconductor diodes.

[0010] In some embodiments, the first controllable shut-off arm V 10 The second controllable shut-off bridge arm V 20 and the third controllable shut-off bridge arm V 100 Any one of them includes: an overvoltage energy limiting device, wherein the overvoltage energy limiting device is connected in parallel with the power semiconductor device having controllable turn-off capability; wherein the overvoltage energy limiting device is a zinc oxide surge arrester.

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

[0012] This application also provides a converter valve hall, including the mixing converter as described above, and further including: a normal converter valve tower, and a second and third-terminal mixing bridge arm V. 22 The fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The second valves respectively arranged in the normal converter valve tower, and the first three-terminal mixing 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 in the normal converter valve tower; in the special converter valve tower, the first controllable shut-off bridge arm V 10 The first valve arranged in the special converter valve tower, the second controllable shut-off bridge arm V 20 The second valve is located in the special converter valve tower.

[0013] In some embodiments, the first valve and the second valve of the normal converter valve tower both include multiple valve layers. Each valve layer includes a controllable shut-off valve section and an uncontrollable shut-off valve section. The controllable shut-off valve sections in different valve layers are connected in series, and the uncontrollable shut-off valve sections in different valve layers are connected in series.

[0014] Beneficial Effects: Compared with the prior art, in the hybrid converter of the present invention, a first DC output and a first auxiliary DC output terminal are formed by connecting a first controllable turn-off bridge arm, a second three-terminal hybrid bridge arm, a fourth three-terminal hybrid bridge arm, and a sixth three-terminal hybrid bridge arm; a second DC output terminal and a second auxiliary DC output terminal are formed by connecting a second controllable turn-off bridge arm, a first three-terminal hybrid bridge arm, a third three-terminal hybrid bridge arm, and a fifth three-terminal hybrid bridge arm. The hybrid converter of the present invention achieves shared use of fully controllable converter bridge arms, ensuring that the commutation failure problem is solved, while minimizing the use of fully controllable semiconductor devices, reducing the overall cost of the converter, improving reliability, and reducing the workload of operation and maintenance. Attached Figure Description

[0015] The technical solution and other beneficial effects of the present invention will become apparent from the following detailed description of specific embodiments of the 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 this application;

[0017] Figure 2 This is a schematic diagram of the structure of the upper bridge arm assembly consisting of the three-end hybrid bridge arm in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the structure of the lower bridge arm assembly consisting of the three-end hybrid bridge arm in an embodiment of this application;

[0019] Figures 4a to 4l These are schematic diagrams of the controllable shut-off bridge arms in various embodiments of this application;

[0020] Figures 5a-5c These are schematic diagrams of the non-controllable shut-off bridge arms in various embodiments of this application;

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

[0022] Figure 7 This is a schematic diagram of the converter valve chamber according to the second embodiment of this application; Detailed Implementation

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

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0025] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention.

[0026] Please see Figure 1 , Figure 1 This is a schematic diagram of a hybrid converter according to an embodiment of this application; the hybrid converter valve provided in this application includes: a first DC output terminal P, a second DC output terminal N, and a first auxiliary DC output terminal P. 10 Second auxiliary DC output terminal N 10 First AC output terminal A, second AC output terminal B, third AC output terminal C, first controllable shut-off bridge arm V 10 Second controllable shut-off bridge arm V 20 The first bridge arm group and the second bridge arm group, the first bridge arm group including the second three-end hybrid bridge arm V 22 Fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The second bridge arm assembly includes the first three-end hybrid bridge arm V. 11 The third three-terminal hybrid bridge arm V 33 and the fifth three-end hybrid bridge arm V 55 Among them, the second and third end hybrid bridge arm V 22Fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The connection forms the first bridge arm group, the first three-end hybrid bridge arm V 11 The third three-terminal hybrid bridge arm V 33 and the fifth three-end hybrid bridge arm V 55 The connection forms the second bridge arm assembly.

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

[0028] Second controllable shut-off bridge arm V 20 First end, first three end hybrid bridge arm V 11 The second and third three-end hybrid bridge arm V 33 The second and fifth / third end hybrid bridge arms V 55 The second terminal is connected to form the second auxiliary DC output terminal N. 10 Second controllable shut-off bridge arm V 20 The second end and the first and third end hybrid bridge arm V 11 The third end, the third three-end hybrid bridge arm V 33 The third and fifth three-end hybrid bridge arms V 55 The third terminal is connected to form the second DC output terminal N.

[0029] Please see Figure 2 , Figure 2This is a schematic diagram of the structure of the first bridge arm group in an embodiment of this application, which is a three-terminal hybrid bridge arm. In some embodiments of this application, the second three-terminal hybrid bridge arm V... 22 Fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 Any of the following includes: uncontrollable shut-off bridge arm V 120 and the third controllable shut-off bridge arm V 100 The third controllable shut-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 turn-off bridge arm V. 120 One end is the third end T of the three-terminal hybrid bridge arm, and the third controllable shut-off bridge arm V. 100 The other end is connected to the uncontrollable shut-off bridge arm V 120 The other end is connected to the second DC output terminal N, which forms the three-terminal hybrid bridge arm.

[0030] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the second bridge arm group in this embodiment of the application, which is a three-terminal hybrid bridge arm. The first three-terminal hybrid bridge arm V 11 The third three-terminal hybrid bridge arm V 33 With the fifth three-end hybrid bridge arm V 55 Any of the following includes: uncontrollable shut-off bridge arm V 120 and the third controllable shut-off bridge arm V 100 The third controllable shut-off bridge arm V 100 One end is connected to the non-controllable shut-off bridge arm V 120 One end is connected to form the first DC output terminal P of the three-terminal hybrid bridge arm, and the non-controllable turn-off bridge arm V is connected to the other end. 120 The other end is the third end T of the three-terminal hybrid bridge arm, and the third controllable shut-off bridge arm V. 100 The other end is the second DC output terminal N of the three-terminal hybrid bridge arm.

[0031] Please see Figures 4a to 4l , Figure 4l These are schematic diagrams of 12 different structures for controllable shut-off bridge arms in embodiments of this application. In this embodiment, the first controllable shut-off bridge arm V... 10 Second controllable shut-off bridge arm V 20 and the third controllable shut-off bridge arm V 100 Either of the following includes: at least one power semiconductor device with controllable turn-off capability; or, the first controllable turn-off bridge arm V 10 Second controllable shut-off bridge arm V 20 and the third controllable shut-off bridge arm V 100Any one of the following includes: at least one power semiconductor device with controllable turn-off capability, at least one power semiconductor without controllable turn-off capability, wherein the power semiconductor device with controllable turn-off capability is connected to the power semiconductor without controllable turn-off capability; the power semiconductor device with controllable turn-off capability can be connected in parallel with an overvoltage energy limiting device; and the power semiconductor device with controllable turn-off capability includes at least one of IGBT and IGCT; and / or, the power semiconductor without controllable turn-off capability includes at least one of a power thyristor without controllable turn-off capability and a power diode without controllable turn-off capability.

[0032] Furthermore, the first controllable shut-off arm V 10 Second controllable shut-off bridge arm V 20 and the third controllable shut-off bridge arm V 100 Any of these includes an overvoltage energy limiting device, which is connected in parallel with a power semiconductor device having controllable shutdown capability; the overvoltage energy limiting device is a zinc oxide surge arrester.

[0033] The following are respectively for Figures 4a to 4l The structure of the controllable shut-off bridge arm in the process will be explained in detail.

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

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

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

[0037] like Figure 4d As shown, the controllable turn-off bridge arm includes: at least one IGCT with controllable turn-off capability, at least one uncontrollable turn-off power semiconductor diode, which are connected in series; and then at least one set of IGCTs and diode components are connected in parallel.

[0038] like Figure 4e As shown, the controllable turn-off bridge arm includes: at least one IGBT with controllable turn-off capability, at least one non-controllable turn-off power semiconductor thyristor, which are connected in series; and then at least one set of IGBTs and thyristor assemblies are connected in parallel.

[0039] like Figure 4fAs shown, the controllable turn-off bridge arm includes: at least one IGCT with controllable turn-off capability and at least one non-controllable turn-off power semiconductor thyristor, which are connected in series; and then at least one set of IGCTs and thyristor components are connected in parallel.

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

[0041] like Figure 4h As shown, the controllable turn-off bridge arm has a first output terminal and a second output terminal. The controllable turn-off bridge arm includes: at least one stage of uncontrollable turn-off power semiconductor thyristor, at least one stage of IGBT with controllable turn-off capability, and at least one stage of uncontrollable turn-off power semiconductor diode. One end of the at least one stage of uncontrollable turn-off power semiconductor thyristor is the first output terminal. The other end of the at least one stage of uncontrollable turn-off power semiconductor thyristor, one end of the at least one stage of IGBT with controllable turn-off capability, and one end of the at least one stage of uncontrollable turn-off power semiconductor thyristor are connected. The other end of the at least one stage of IGBT with controllable turn-off capability is connected to one end of the at least one stage of uncontrollable turn-off power semiconductor diode. The other end of the at least one stage of uncontrollable turn-off power semiconductor diode is connected to the other end of the at least one stage of uncontrollable turn-off power semiconductor thyristor to form the second output terminal.

[0042] like Figure 4i As shown, the controllable turn-off bridge arm of this application has a first output terminal and a second output terminal. The controllable turn-off bridge arm includes: at least one stage of uncontrollable turn-off power semiconductor thyristor, IGCT, at least one stage of uncontrollable turn-off power semiconductor diode, and another at least one stage of uncontrollable turn-off power semiconductor thyristor; wherein, one end of the at least one stage of uncontrollable turn-off power semiconductor thyristor serves as the first output terminal; and the other end of the at least one stage of uncontrollable turn-off power semiconductor thyristor, one end of the at least one stage of IGCT with controllable turn-off capability, and one end of the other at least one stage of uncontrollable turn-off power semiconductor thyristor are connected; and the other end of the at least one stage of IGCT with controllable turn-off capability and one end of the at least one stage of uncontrollable turn-off power semiconductor diode are connected to form the second output terminal.

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

[0044] Please see Figure 4k The controllable turn-off bridge arm in this embodiment has a first output terminal and a second output terminal. The controllable turn-off bridge arm includes: at least one stage of uncontrollable turn-off power semiconductor thyristor, an overvoltage energy limiting unit, at least one stage of IGCT with controllable turn-off capability, another at least one stage of uncontrollable turn-off power semiconductor thyristor, and at least one stage of uncontrollable turn-off power semiconductor diode; wherein, one end of the at least one stage of uncontrollable turn-off power semiconductor thyristor is the first output terminal; and the other end of the at least one stage of uncontrollable turn-off power semiconductor thyristor, one end of the overvoltage energy limiting unit, one end of the at least one stage of IGCT with controllable turn-off capability, and one end of the other at least one stage of uncontrollable turn-off power semiconductor thyristor are connected; and the other end of the at least one stage of IGCT with controllable turn-off capability, the other end of the overvoltage energy limiting unit, and one end of the at least one stage of uncontrollable turn-off power semiconductor diode are connected; and the other end of the at least one stage of uncontrollable turn-off power semiconductor diode and the other end of the at least one stage of uncontrollable turn-off power semiconductor thyristor are connected to form the second output terminal.

[0045] Please see Figure 4l The controllable turn-off bridge arm in this embodiment has a first output terminal and a second output terminal. The controllable turn-off bridge arm includes: at least one IGBT with controllable turn-off capability, another at least one IGBT with controllable turn-off capability, and a capacitor. One end of the at least one IGBT with controllable turn-off capability is connected to one end of the capacitor, and the other end of the at least one IGBT with controllable turn-off capability is connected to one end of the other at least one IGBT with controllable turn-off capability to form the first output terminal. The other end of the other at least one IGBT with controllable turn-off capability is connected to the other end of the capacitor to form the second output terminal.

[0046] Please see Figures 5a-5c , Figure 5a This is a schematic diagram of the structure of a non-controllable shut-off bridge arm in one embodiment of this application; Figure 5b This is a schematic diagram of the structure of a non-controllable shut-off bridge arm in another embodiment of this application; Figure 5c This is a schematic diagram of the structure of a non-controllable turn-off bridge arm in another embodiment of this application. In this embodiment, the non-controllable turn-off bridge arm includes a non-controllable turn-off power semiconductor, which includes: at least one stage of diode with non-controllable turn-off capability, and / or, at least one stage of thyristor with non-controllable turn-off capability.

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

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

[0049] like Figure 5c In one embodiment, the uncontrollable turn-off bridge arm includes: at least one stage of thyristor with uncontrollable turn-off capability and at least one stage of uncontrollable turn-off power semiconductor diode, which are connected in series; and then at least one set of thyristor and diode components with uncontrollable turn-off capability are connected in parallel.

[0050] Please see Figure 6 , Figure 6 This is a structural schematic diagram of a converter valve hall provided in this application. The converter valve hall includes: three normal converter valve towers, with hybrid converters respectively arranged in the converter valve hall via suspension insulators, and six three-terminal hybrid bridge arms of the hybrid converters arranged in 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 Fifth three-end hybrid bridge arm V 55 The lower valves of the three normal converter valve towers, and the second and third end mixing bridge arms V are respectively arranged. 22 Fourth three-terminal hybrid bridge arm V 44 The sixth three-end hybrid bridge arm V 66 The valves are respectively arranged on the upper valves of the three normal converter valve towers; 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, located in the special converter valve tower, has a second controllable shut-off bridge arm V. 20The lower valves are located in special converter valve towers; four valve towers are arranged horizontally, and different valve layers are arranged vertically in each valve tower. The valve layers are connected and fixed by suspension insulators. Each valve layer in the three normal converter valve towers contains: a controllable shut-off valve section and an uncontrollable shut-off valve section, which are arranged in parallel; the controllable shut-off valve sections in different layers of the upper and lower bridge arms are electrically connected end to end to form a series structure, and the uncontrollable shut-off valve sections in different layers of the upper and lower bridge arms are electrically connected end to end to form a series structure.

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

[0052] like Figure 6 As shown, the first end of the uncontrollable shut-off valve section of the first layer of the converter valve, the bottom shield of the uncontrollable shut-off valve, and the second auxiliary DC output terminal N are shown. 10 The connection is made by connecting the end of the uncontrollable shut-off valve section of the first layer of the lower valve of the converter valve to the beginning of the uncontrollable shut-off valve section of the second layer of the upper valve of the converter valve; connecting the end of the uncontrollable shut-off valve section of the second layer of the upper valve of the converter valve to the beginning of the uncontrollable shut-off valve section of the third layer of the upper valve of the converter valve, until connecting to the end of the uncontrollable shut-off valve section of the Nth layer of the upper valve of the converter valve.

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

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

[0055] like Figure 6As shown, the end of the uncontrollable shut-off valve section of the first layer of the converter valve is connected to the beginning of the uncontrollable shut-off valve section of the second layer of the converter valve; the end of the uncontrollable shut-off valve section of the second layer of the converter valve is connected to the beginning of the uncontrollable shut-off valve section of the third layer of the converter valve, until it connects to the end of the uncontrollable shut-off valve section of the Nth layer of the converter valve; the end of the uncontrollable shut-off valve section of the Nth layer of the converter valve, the top shield of the uncontrollable shut-off valve, and the first auxiliary DC output terminal P 10 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 shut-off bridge arm V 20 It consists of controllable shut-off valve sections that are electrically connected end to end.

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

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

[0059] Please see Figure 7 , Figure 7 This is a schematic diagram of a converter valve hall in another embodiment of this application. The converter valve hall includes three normal converter valve towers and a special converter valve tower. The hybrid converter is arranged in the converter valve hall in phases via suspension insulators. The six three-terminal hybrid bridge arms of the hybrid converter are arranged in the three normal converter valve towers. Specifically, the hybrid converter is arranged in the converter valve hall in phases via suspension insulators, and the six three-terminal hybrid bridge arms are arranged in the three normal converter valve towers. The first three-terminal hybrid bridge arm V... 11The third three-terminal hybrid bridge arm V 33 Fifth three-end hybrid bridge arm V 55 The first valve in the three normal converter valve towers is designated as the lower valve, and the second and third end mixing bridge arms V 22 Fourth three-terminal hybrid bridge arm V 44 The sixth three-end hybrid bridge arm V 66 The second valve located on the three normal converter valve towers is referred to as the upper valve. The three normal converter valve towers are arranged horizontally. The valve towers connected to the DC side and the auxiliary DC side are special converter valve towers, which are arranged on the ground by supporting insulators.

[0060] The hybrid converter and converter valve hall of this invention are connected by a first controllable turn-off bridge arm, a second three-terminal hybrid bridge arm, a fourth three-terminal hybrid bridge arm, and a sixth three-terminal hybrid bridge arm to form a first DC output and a first auxiliary DC output terminal; and connected by a second controllable turn-off bridge arm, a first three-terminal hybrid bridge arm, a third three-terminal hybrid bridge arm, and a fifth three-terminal hybrid bridge arm to form a second DC output terminal and a second auxiliary DC output terminal. The hybrid converter of this invention achieves shared use of fully controllable converter bridge arms, ensuring that the commutation failure problem is solved while minimizing the use of fully controllable semiconductor devices, reducing the overall cost of the converter, improving reliability, and reducing operation and maintenance workload.

[0061] The above provides a detailed description of the mixing converter valve and converter valve chamber provided in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present invention. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid converter, characterized in that, include: First controllable shut-off bridge arm V 10 Second and third end hybrid bridge arm V 22 Fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The first controllable shut-off bridge arm V 10 The second and third-terminal hybrid bridge arm V 22 The fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The connection forms a first DC output terminal P and a first auxiliary DC output terminal P. 10 ; Second controllable shut-off bridge arm V 20 First three-terminal hybrid bridge arm V 11 The third three-terminal hybrid bridge arm V 33 and the fifth three-end hybrid bridge arm V 55 The second controllable shut-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 connection forms a second DC output terminal N and a second auxiliary DC output terminal N. 10 ; The second and third end hybrid bridge arm V 22 The fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 Any of the following includes: The third controllable shut-off bridge arm includes a first DC output terminal P; The first non-controllable turn-off bridge arm includes a third terminal, and the third terminal of the first non-controllable turn-off bridge arm is connected to the first auxiliary DC output terminal P. 10 The third controllable shut-off bridge arm is connected to the first uncontrollable shut-off bridge arm to form an AC output terminal.

2. The hybrid converter 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 The connection forms the first AC output terminal A; the sixth three-terminal hybrid bridge arm V 66 With the third three-terminal hybrid bridge arm V 33 The connection forms the second AC output terminal B; the second three-terminal hybrid bridge arm V 22 With the fifth three-end hybrid bridge arm V 55 Connect to form the third AC output terminal C.

3. The hybrid converter 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 the following includes: The fourth controllable shutdown bridge arm includes a second DC output terminal N; The second uncontrollable turn-off bridge arm includes a third terminal, and the third terminal of the second uncontrollable turn-off bridge arm is connected to the second auxiliary DC output terminal N. 10 The second non-controllable shutdown bridge arm is connected to the fourth controllable shutdown bridge arm to form an AC output terminal.

4. The hybrid converter according to claim 3, characterized in that, First controllable shut-off arm V 10 The second controllable shut-off bridge arm V 20 Either the third controllable shut-off arm or the fourth controllable shut-off arm includes: At least one stage of a power semiconductor device with controllable turn-off capability; or, At least one power semiconductor device with controllable turn-off capability and at least one power semiconductor with uncontrollable turn-off capability are connected together.

5. The hybrid converter according to claim 4, characterized in that, The power semiconductor device with controllable turn-off capability includes any one of IGBT and IGCT; and / or, The uncontrollable power turn-off semiconductor includes at least one of the uncontrollable power turn-off semiconductor thyristors and uncontrollable power turn-off semiconductor diodes.

6. The hybrid converter according to claim 4, characterized in that, First controllable shut-off arm V 10 The second controllable shut-off bridge arm V 20 Either the third controllable shut-off arm or the fourth controllable shut-off arm includes: An overvoltage energy limiting device, wherein the overvoltage energy limiting device is connected in parallel with the power semiconductor device having controllable turn-off capability; The overvoltage energy limiting device is a zinc oxide surge arrester.

7. The hybrid converter according to claim 3, characterized in that, Either the first uncontrollable shut-off arm or the second uncontrollable shut-off arm includes: At least one diode with uncontrollable turn-off capability, or diodes with at least one uncontrollable turn-off capability connected in series and / or in parallel; or, At least one stage of thyristor with non-controllable turn-off capability, or thyristors with at least one stage of non-controllable turn-off capability connected in series and / or parallel; or, At least one thyristor with uncontrollable turn-off capability and at least one power semiconductor diode with uncontrollable turn-off capability are connected in series.

8. A converter valve chamber, characterized in that, The hybrid converter, as described in any one of claims 1 to 7, further includes: Normal converter valve tower, second and third end mixing bridge arm V 22 The fourth three-terminal hybrid bridge arm V 44 and the sixth three-end hybrid bridge arm V 66 The second valves respectively arranged in the normal converter valve tower, and the first three-terminal mixing 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 in the normal converter valve tower; Special converter valve tower, the first controllable shut-off bridge arm V 10 The first valve arranged in the special converter valve tower, the second controllable shut-off bridge arm V 20 The second valve is located in the special converter valve tower.

9. The converter valve chamber according to claim 8, characterized in that, The first and second valves of the normal converter valve tower each include multiple valve layers. Each valve layer includes a controllable shut-off valve section and an uncontrollable shut-off valve section. The controllable shut-off valve sections of adjacent valve layers are connected in series, and the uncontrollable shut-off valve sections of adjacent valve layers are connected in series.

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