CN211981511U - Current conversion device based on bipolar direct current transmission system - Google Patents
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- CN211981511U CN211981511U CN202021068368.9U CN202021068368U CN211981511U CN 211981511 U CN211981511 U CN 211981511U CN 202021068368 U CN202021068368 U CN 202021068368U CN 211981511 U CN211981511 U CN 211981511U
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Abstract
The application discloses current conversion device based on bipolar direct current transmission system includes: the system comprises a first high-voltage isolating switch, a first converter, a second converter, a first transformer and a second transformer; the positive polarity high-voltage end of the first converter is connected with the positive polarity high-voltage end of the second converter through a first high-voltage isolating switch, or the negative polarity high-voltage end of the first converter is connected with the negative polarity high-voltage end of the second converter through a first high-voltage isolating switch; the low-voltage end of the first converter is connected with the low-voltage end of the second converter; the first transformer and the second transformer are respectively connected with the first converter and the second converter, so that the technical problems that the function debugging work of the converter station can be carried out only by connecting a direct-current line and an opposite converter station to form a power transmission loop and a complete power transmission loop cannot be formed through a single converter station in the converter station of the conventional bipolar direct-current power transmission system are solved.
Description
Technical Field
The application relates to the technical field of direct current transmission, in particular to a current conversion device based on a bipolar direct current transmission system.
Background
The direct current transmission systems are both two-end or multi-end systems, each end converter station and a direct current line need to be connected to form a direct current loop and debug before production, for some direct current transmission systems, at the initial stage of building a converter station, problems that the direct current line and the converter station cannot be built simultaneously, other converter stations in the direct current transmission system and the converter station cannot be built simultaneously and the like may exist, and the problems affect the development of function debugging work of the converter station in the direct current transmission system. Therefore, it is ensured that the converter station and the dc line are built and can be connected to form a loop so as to meet the conditions for the development of the function debugging work of the converter station in the dc transmission system.
As shown in fig. 1, for a bipolar normal transmission mode of an existing converter station, a converter station of an existing bipolar dc transmission system needs to form a transmission loop by connecting a dc line and an opposite converter station to perform function debugging work of the converter station, and cannot form a complete transmission loop through a single converter station.
SUMMERY OF THE UTILITY MODEL
The application provides a current conversion device based on a bipolar direct-current transmission system, which is used for solving the technical problems that the current conversion station of the existing bipolar direct-current transmission system needs to form a power transmission loop by connecting a direct-current line and an opposite current conversion station, the function debugging work of the current conversion station can be carried out, and a complete power transmission loop cannot be formed through a single current conversion station.
The application provides a current conversion device based on bipolar direct current transmission system includes: the system comprises a first high-voltage isolating switch, a first converter, a second converter, a first transformer and a second transformer;
the positive polarity high-voltage end of the first converter is connected with the positive polarity high-voltage end of the second converter through the first high-voltage isolating switch, or the negative polarity high-voltage end of the first converter is connected with the negative polarity high-voltage end of the second converter through the first high-voltage isolating switch;
the low-voltage end of the first converter is connected with the low-voltage end of the second converter;
the first end of the first transformer is connected with the first converter, and the second end of the first transformer is connected with an alternating current system;
and the first end of the second transformer is connected with the second converter, and the second end of the second transformer is connected with the alternating current system.
Optionally, a second high-voltage isolating switch is further included;
the second high-voltage isolating switch is arranged at the high-voltage end of the first converter or the high-voltage end of the second converter.
Optionally, the first converter is a half-bridge type modular multilevel converter or a full-bridge type modular multilevel converter.
Optionally, the second converter is a half-bridge type modular multilevel converter or a full-bridge type modular multilevel converter.
Optionally, the number of the first converters is multiple;
the first converters are connected in series in sequence.
Optionally, the number of the second converters is multiple;
the second converters are connected in series in sequence.
According to the technical scheme, the method has the following advantages:
the application discloses current conversion device based on bipolar direct current transmission system includes: the system comprises a first high-voltage isolating switch, a first converter, a second converter, a first transformer and a second transformer; the positive polarity high-voltage end of the first converter is connected with the positive polarity high-voltage end of the second converter through a first high-voltage isolating switch, or the negative polarity high-voltage end of the first converter is connected with the negative polarity high-voltage end of the second converter through a first high-voltage isolating switch; the low-voltage end of the first converter is connected with the low-voltage end of the second converter; the first end of the first transformer is connected with the first current converter, and the second end of the first transformer is connected with the alternating current system; the first end of the second transformer is connected with the second converter, and the second end of the second transformer is connected with the alternating current system.
The application provides electric energy to a first converter and a second converter through a first transformer and a second transformer, connects positive polarity high-voltage ends of the first converter and the second converter or connects negative polarity high-voltage ends of the two converters, and the low-voltage end of the first converter is connected with the low-voltage end of the second converter, so that two poles of the two converters in the converter device run at the same polarity and the same pressure, a single converter station of a bipolar direct-current transmission system runs back-to-back, when a direct current line is not built or an opposite converter station is not built, a complete power transmission loop is formed only through a single converter station, and the technical problems that function debugging work of the converter station can be carried out only by connecting the direct current line and the opposite converter station to form the power transmission loop and a complete power transmission loop cannot be formed through the single converter station in the converter station of the existing bipolar direct current power transmission system are solved.
Drawings
Fig. 1 is a schematic diagram of bipolar operation of a converter station according to the present embodiment;
fig. 2 is a schematic diagram of a converter device based on a bipolar direct-current transmission system according to an embodiment of the present application.
Detailed Description
Fig. 1 shows a normal power transmission mode for bipolar operation of a converter station, in the case of bipolar operation of a converter station in a conventional bipolar dc power transmission system, the polarity of a bipolar converter is opposite, the high-voltage end and the low-voltage end of the converter of the bipolar 1 are respectively a positive high-voltage end and a low-voltage end, the high-voltage end and the low-voltage end of the converter of the bipolar 2 are respectively a negative high-voltage end and a low-voltage end, the bipolar converter is of a reverse polarity, the directions of currents of bipolar valve sets are the same, the directions of voltages are the same, currents flow out/flow in positive and negative polar lines through dc. By adopting the operation mode, a single converter station needs to form a power transmission loop by connecting a direct current line with the opposite converter station. If the direct-current line and the opposite converter station are unavailable, and a single converter station can only be electrified, namely, the voltage and the current are available, a complete power transmission loop cannot be formed through the single converter station. The single-pole earth return operation mode and the single-pole metal operation mode also need to form a power transmission loop by connecting a direct-current line and an opposite converter station, and a complete power transmission loop cannot be formed by a single converter station.
In view of this, an embodiment of the present application provides a converter device based on a bipolar direct current transmission system, which is used to solve the technical problem that a converter station of an existing bipolar direct current transmission system can only perform function debugging work of the converter station by connecting a direct current line and an opposite side converter station to form a transmission loop, and a complete transmission loop cannot be formed through a single converter station.
In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 2, an embodiment of the present application provides a converter apparatus based on a bipolar dc power transmission system, including: the system comprises a first high-voltage isolating switch, a first converter, a second converter, a first transformer and a second transformer;
the positive polarity high-voltage end of the first converter is connected with the positive polarity high-voltage end of the second converter through a first high-voltage isolating switch, or the negative polarity high-voltage end of the first converter is connected with the negative polarity high-voltage end of the second converter through a first high-voltage isolating switch; the low-voltage end of the first converter is connected with the low-voltage end of the second converter; the first end of the first transformer is connected with the first current converter, and the second end of the first transformer is connected with the alternating current system; the first end of the second transformer is connected with the second converter, and the second end of the second transformer is connected with the alternating current system.
The first converter and the second converter may be modular multilevel converters, but in the present application, a converter having a current reversing function may be used, and is not limited to the above-mentioned modular multilevel converters.
It should be noted that, the inverter device in the embodiment of the present application may have other wiring operation modes besides the wiring operation mode expressed above, for example, during non-system commissioning.
It should be noted that, in a single converter station in a bipolar direct current transmission system, in a normal case, when a pole 1 converter operates in a positive polarity, a pole 2 converter operates in a negative polarity, and when a bipolar converter operates in an inverse polarity, in the embodiment of the present application, in order to enable two pole converters of a single converter device in the bipolar direct current transmission system to operate back to back, so as to form a transmission loop, the two pole converters need to operate in a same-polarity isobaric mode. I.e. to operate one of the converters in current reversal and to operate the first and second converters homopolar and isobaric. In the case of the positive polarity operation of the first converter, i.e., the pole 1 converter, the pole 2 converter, i.e., the second converter, needs to operate in positive polarity, and thus the low voltage end of the pole 2 converter of the original bipolar dc transmission system needs to be changed to a positive polarity high voltage end, and the negative polarity high voltage end of the pole 2 converter of the original bipolar dc transmission system needs to be changed to a low voltage end, and of course, if the pole 2 converter operates in negative polarity, the low voltage end of the pole 1 converter of the original bipolar dc transmission system needs to be changed to a negative polarity high voltage end, and the positive polarity high voltage end of the pole 1 converter of the original bipolar dc transmission system needs to be. When the pole 1 converter and the pole 2 converter operate in the same-polarity isobaric mode, a first high-voltage isolating switch Kp is arranged between a point P1 and a point P2, the first high-voltage isolating switch Kp is closed, the high-voltage end of the first converter is connected with the high-voltage end of the second converter in the same polarity, the low-voltage end of the first converter is connected with the low-voltage end of the second converter by controlling other switches of the converter, so that a single converter in a bipolar direct-current transmission system operates in a bipolar back-to-back mode, when a side converter station and a direct-current line are built, namely a single converter does not need to form a loop, the first high-voltage isolating switch Kp needs to be disconnected, so that the pole 1 converter and the pole 2 converter operate in the opposite polarities, namely the pole 1 converter operates in the positive polarity, the pole 2 operates in the negative polarity, so that the converter forms a transmission loop with the side converter station through the direct-current line, normal bipolar dc transmission system operation is resumed.
In the embodiment of the application, when the first converter and the second converter are in homopolar isobaric operation, the first high-voltage isolating switch is closed, so that the high-voltage end of the first converter is connected with the high-voltage end of the second converter in a homopolar manner, the low-voltage end of the first converter is connected with the low-voltage end of the second converter, and the first converter or the second converter is operated in a current reverse direction to form a bipolar back-to-back operation transmission loop, so that the two converters are in homopolar isobaric back-to-back operation, a back-to-back operation mode of a single converter station in a bipolar direct current transmission system is realized, a system function debugging result of the converter station is obtained by acquiring debugging operation information of the converter station, when a direct current line is not built or an opposite converter station is not built, a complete loop can be formed only through the single converter station, debugging is carried out, and the converter station of the existing bipolar direct current transmission system is solved, the technical problem that a complete power transmission loop cannot be formed through a single converter station can be solved by connecting a direct current line and an opposite converter station to form a power transmission loop and carrying out function debugging work of the converter station.
The above is a first embodiment of a commutation device based on a bipolar dc power transmission system provided in the present application, and the following is a second embodiment of a commutation device based on a bipolar dc power transmission system provided in the present application, and refer to fig. 2 specifically.
The embodiment of the application provides a current conversion device based on bipolar direct current transmission system, includes: the system comprises a first high-voltage isolating switch, a first converter, a second converter, a first transformer and a second transformer; the positive polarity high-voltage end of the first converter is connected with the positive polarity high-voltage end of the second converter through a first high-voltage isolating switch, or the negative polarity high-voltage end of the first converter is connected with the negative polarity high-voltage end of the second converter through a first high-voltage isolating switch; the low-voltage end of the first converter is connected with the low-voltage end of the second converter; the first end of the first transformer is connected with the first current converter, and the second end of the first transformer is connected with the alternating current system; the first end of the second transformer is connected with the second converter, and the second end of the second transformer is connected with the alternating current system.
The first converter and the second converter may be modular multilevel converters, but in the present application, a converter having a current reversing function may be used, and is not limited to the above-mentioned modular multilevel converters.
It should be noted that, when a single converter device of the bipolar direct current transmission system forms a transmission loop, the debugging operation information of the primary equipment of the converter device may be obtained, and the debugging result of the primary equipment of the converter device may be obtained through the debugging operation information. The debugging operation information comprises: the method comprises the steps of normal starting, power transmission, power lifting, protection actions during shutdown and faults of the converter station and the through-current condition of primary equipment.
In general, in a single converter station in a bipolar direct-current transmission system, when a converter of a pole 1 operates in a positive polarity, a converter of a pole 2 operates in a negative polarity, and when a converter of a bipolar converter operates in a reverse polarity, in order to enable the converters of the two poles of a single converter device in the bipolar direct-current transmission system to operate back to back, so as to form a transmission loop, the converters of the two poles need to operate in a same polarity and equal pressure. I.e. to operate one of the converters in current reversal and to operate the first and second converters homopolar and isobaric.
Further, when the first converter and the second converter both run in positive polarity and isobaric mode, the first high-voltage isolating switch is closed, so that the positive polarity high-voltage end of the first converter is connected with the positive polarity high-voltage end of the second converter, and a bipolar back-to-back running power transmission loop is formed. In the case of the positive polarity operation of the first converter, i.e., the pole 1 converter, and the positive polarity operation of the second converter, i.e., the pole 2 converter, it is necessary to change the low voltage terminal of the pole 2 converter of the original bipolar dc transmission system to the positive polarity high voltage terminal, and the negative polarity high voltage terminal of the pole 2 converter of the original bipolar dc transmission system to the low voltage terminal. The pole 2 converter is operated in reverse current flow so that both the first and second converters are operated with positive polarity and equal voltage.
Further, when the first converter and the second converter both run with negative polarity at the same voltage, the first high-voltage isolating switch is closed, so that the negative polarity high-voltage end of the first converter is connected with the negative polarity high-voltage end of the second converter, and a bipolar back-to-back running power transmission loop is formed. In the example of the second converter, i.e., the pole 2 converter, operating with a negative polarity, the pole 1 converter also needs to operate with a negative polarity, and thus the low-voltage end of the pole 1 converter of the original bipolar dc transmission system needs to be changed to a negative-polarity high-voltage end, and the positive-polarity high-voltage end of the pole 1 converter of the original bipolar dc transmission system needs to be changed to a low-voltage end. The pole 1 converter is operated in reverse current flow so that both the first and second converters are operated with positive polarity and equal voltage.
When the pole 1 converter and the pole 2 converter operate in the same polarity and isobaric mode, a first high-voltage isolating switch Kp is arranged between a point P1 and a point P2, the first high-voltage isolating switch Kp is closed, the high-voltage end of the first converter is connected with the high-voltage end of the second converter in the same polarity, the low voltage side of the first converter is connected to the low voltage side of the second converter by controlling the other switches of the converter station, thereby leading a single converter device in the bipolar direct current transmission system to realize the bipolar back-to-back operation, when the converter station at the opposite side and the direct current line are built, i.e. when it is not necessary to loop a single converter station, it is necessary to open the first high voltage disconnector Kp, to operate the pole 1 converter and the pole 2 converter in reverse polarity, i.e. the pole 1 converter is operating in positive polarity, the pole 2 should be operating in negative polarity, so that the converter device forms a transmission loop with the opposite converter station via the dc link, and normal operation of the bipolar dc transmission system is resumed.
Circuit breakers such as KN1, KN2, KNM, KNG, KM2 and K21 are provided in converter stations of a bipolar dc transmission system, and in order to operate the bipolar converters of a single converter device in the bipolar dc transmission system back to back and form a transmission circuit, the bipolar converters are operated at the same polarity and the same voltage. For example, when the first converter, i.e., the pole 1 converter, is operated in a positive polarity, the pole 2 converter, i.e., the second converter, needs to be operated in a positive polarity, and the low voltage end of the pole 2 converter of the original bipolar dc transmission system needs to be changed to a positive polarity high voltage end, and the negative polarity high voltage end of the pole 2 converter of the original bipolar dc transmission system needs to be changed to a low voltage end, i.e., when the two pole converters are operated in a positive polarity, Kp, KN1, KNM, KM2 and K21 are in a closed state, and other circuit breakers are in an open state, so that the positive polarity high voltage end of the pole 1 converter is connected with the positive polarity high voltage end of the pole 2 converter, and the low voltage end of the pole 1 converter is connected with the low voltage end of the pole 2 converter, and the second current converter.
And a first high-voltage isolating switch Kp is arranged between the point P1 and the point P2, namely between the high-voltage end of the pole 1 converter and the high-voltage end of the pole 2 converter, when the opposite side converter station and the direct-current line are built, and a loop does not need to be formed by back-to-back operation of a single converter device, the first high-voltage isolating switch Kp can be disconnected, the open and closed states of other circuit breakers and isolating switches are set, and the pole 1 converter and the pole 2 converter are operated in an inverse polarity mode, namely the pole 1 converter and the pole 2 converter are operated in a positive polarity mode, the pole 2 converter is operated in a negative polarity mode, so that the converter device and the opposite side converter station form a power transmission loop through the direct-current line, and normal operation of the.
Further, the embodiment of the present application further includes a second high voltage isolation switch KN22, where the second high voltage isolation switch is disposed at the high voltage end of the first converter or the high voltage end of the second converter. Namely a high-voltage end in a back-to-back operation mode and a low-voltage end in a normal operation mode of the original bipolar direct-current transmission system.
It should be noted that, when the pole 2 converter, i.e., the second converter, operates in a current reverse direction, and the pole 1 converter and the pole 2 converter both operate in a positive polarity and an equal voltage, the original low-voltage end operates as a high-voltage end, and the related equipment needs to be modified into high-voltage equipment. Because rated voltage and the insulation level of former 2 transverter low voltage terminal KN2 circuit breaker are lower, in order to reduce the cost of KN2 circuit breaker, can increase a high voltage isolator in the valve side of KN2 circuit breaker, second high voltage isolator KN22 promptly to avoid reforming KN2 circuit breaker into high voltage circuit breaker.
In order to enable the two-pole converter to operate in positive-polarity isobaric mode, the original-pole 1 converter keeps operating in positive polarity, the operation of negative polarity of the original-pole 2 converter is changed into operation in positive polarity, moreover, when a converter device based on a bipolar direct-current transmission system adopts bipolar back-to-back operation, buses and equipment between a point P1 and a point P2, namely between high-voltage ends of the two-pole converter, need to be configured according to high-voltage equipment, buses and equipment between a point P2 and a low-voltage end of the original-pole 2 converter need to be configured according to the high-voltage equipment, and buses and equipment at the low-voltage end of the original. For example, for a 500kV dc transmission system, the configuration of the high voltage equipment is generally: rated voltage 500kV, lightning impulse insulation level 1425kV, and operation impulse insulation level 1175 kV; the configuration of the low voltage devices is generally: rated voltage 75kV, lightning impulse insulation level 250kV and operation impulse insulation level 200 kV.
Further, the first converter in the embodiment of the present application is a half-bridge type modular multilevel converter or a full-bridge type modular multilevel converter, and is not limited to the above-mentioned converters, and all converters capable of operating in a reverse current direction are suitable for the present application, and those skilled in the art can apply the present application according to actual situations.
Further, the second converter in the embodiment of the present application is a half-bridge type modular multilevel converter or a full-bridge type modular multilevel converter, and is not limited to the above-mentioned converters, and all converters capable of operating in a reverse current direction are suitable for the present application, and those skilled in the art can apply the present application according to the actual situation.
It should be noted that, in the embodiment of the present application, by operating the current of one of the pole converters in the reverse direction and operating the first converter and the second converter in the same-polarity equal-voltage manner, that is, when the pole 1 converter operates in the positive polarity, the pole 2 converter, that is, the second converter also operates in the positive polarity, it is necessary to change the low-voltage end of the pole 2 converter of the original bipolar dc transmission system to the positive-polarity high-voltage end and change the negative-polarity high-voltage end of the pole 2 converter of the original bipolar dc transmission system to the low-voltage end, so that the first converter and the second converter are connected back to form a transmission loop. The modular multilevel converter whose current direction is changeable includes a full-bridge type modular multilevel converter and a half-bridge type modular multilevel converter. Therefore, the first converter and the second converter in the present application may be a half-bridge type modular multilevel converter or a full-bridge type modular multilevel converter, and certainly, not limited to the above-mentioned converters, the converters capable of operating in reverse current are all suitable for the present application, and those skilled in the art can apply the present invention according to the actual situation.
Further, in the embodiment of the present application, the number of the first converters is plural, and the plural first converters are sequentially connected in series.
Further, in the embodiment of the present application, the number of the second converters is multiple, and the multiple second converters are sequentially connected in series.
When the voltage ratio of the bipolar dc power transmission system is high, it is necessary to provide a plurality of inverters and connect the plurality of inverters in series in order.
In the embodiment of the application, when the first converter and the second converter are in homopolar isobaric operation, the first high-voltage isolating switch is closed, so that the high-voltage end of the first converter is connected with the high-voltage end of the second converter in a homopolar manner, the low-voltage end of the first converter is connected with the low-voltage end of the second converter, and the first converter or the second converter is operated in a current reverse direction to form a bipolar back-to-back operation transmission loop, so that the two converters are in homopolar isobaric back-to-back operation, a back-to-back operation mode of a single converter device in a bipolar direct current transmission system is realized, a system function debugging result of the converter device is obtained by acquiring debugging operation information of the converter device, when a direct current line is not built or an opposite side converter station is not built, a complete loop can be formed only through the single converter device, debugging is carried out, and the converter station of the existing bipolar direct current transmission system is solved, the technical problem that a complete power transmission loop cannot be formed through a single converter station can be solved by connecting a direct current line and an opposite converter station to form a power transmission loop and carrying out function debugging work of the converter station.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. A converter arrangement based on a bipolar direct current transmission system, comprising: the system comprises a first high-voltage isolating switch, a first converter, a second converter, a first transformer and a second transformer;
the positive polarity high-voltage end of the first converter is connected with the positive polarity high-voltage end of the second converter through the first high-voltage isolating switch, or the negative polarity high-voltage end of the first converter is connected with the negative polarity high-voltage end of the second converter through the first high-voltage isolating switch;
the low-voltage end of the first converter is connected with the low-voltage end of the second converter;
the first end of the first transformer is connected with the first converter, and the second end of the first transformer is connected with an alternating current system;
and the first end of the second transformer is connected with the second converter, and the second end of the second transformer is connected with the alternating current system.
2. The bipolar direct current transmission system based converter device according to claim 1, further comprising a second high voltage isolator;
the second high-voltage isolating switch is arranged at the high-voltage end of the first converter or the high-voltage end of the second converter.
3. A converter arrangement according to claim 1, characterized in that said first converter is a modular multilevel converter of the half-bridge type or a modular multilevel converter of the full-bridge type.
4. A converter arrangement according to claim 1, characterized in that said second converter is a modular multilevel converter of the half-bridge type or a modular multilevel converter of the full-bridge type.
5. The bipolar direct current transmission system based converter device according to claim 1, wherein the number of said first converters is plural;
the first converters are connected in series in sequence.
6. The bipolar direct current transmission system based converter device according to claim 1, wherein a plurality of second converters are provided;
the second converters are connected in series in sequence.
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| CN202021068368.9U CN211981511U (en) | 2020-06-11 | 2020-06-11 | Current conversion device based on bipolar direct current transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114567012A (en) * | 2022-03-17 | 2022-05-31 | 南京南瑞继保电气有限公司 | Wind power direct current sending system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114567012A (en) * | 2022-03-17 | 2022-05-31 | 南京南瑞继保电气有限公司 | Wind power direct current sending system and control method thereof |
| CN114567012B (en) * | 2022-03-17 | 2023-10-13 | 南京南瑞继保电气有限公司 | Wind power direct current sending-out system and control method thereof |
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