CN109672208B - Flexible direct current converter device and system - Google Patents
Flexible direct current converter device and system Download PDFInfo
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- CN109672208B CN109672208B CN201910117756.7A CN201910117756A CN109672208B CN 109672208 B CN109672208 B CN 109672208B CN 201910117756 A CN201910117756 A CN 201910117756A CN 109672208 B CN109672208 B CN 109672208B
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- 238000009499 grossing Methods 0.000 claims description 16
- 230000008901 benefit Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention provides a flexible direct current converter device and a system, wherein the device comprises: three commutation modules; the converter module is connected with a bus bar of the alternating current end and used for converting the alternating current of the alternating current end to output direct current; wherein, each conversion module includes: a bridge arm split reactor, a positive bridge arm converter valve and a negative bridge arm converter valve; a bus bar at the alternating current end is connected with the bridge arm split reactor; the positive pole of the bridge arm split reactor is connected with the positive bridge arm converter valve, and the negative pole of the bridge arm split reactor is connected with the negative bridge arm converter valve. The invention provides a flexible direct current converter device and a system, which are characterized in that split reactors are directly connected to a bus bar at an alternating current end, one split reactor replaces the original two bridge arm reactors, the wiring mode of a current conversion area of a flexible direct current converter station is simplified on the premise that the existing function of the flexible direct current converter station is not affected, the number of reactor equipment is reduced, the engineering investment is saved, the occupied area of a direct current field of the converter station is saved, and the comprehensive benefit is obvious.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation engineering design construction, in particular to a flexible direct current converter device and a system.
Background
The flexible direct current transmission is a high-voltage direct current transmission technology based on a voltage source converter and consists of fully-controlled power electronic devices. The flexible direct current transmission has strong technical advantages in the aspects of island power supply, capacity-increasing transformation of an urban power distribution network, interconnection of an alternating current system, large-scale wind power plant grid connection and the like, and is a strategic choice for changing the power grid development pattern. The flexible direct current converter station is an important component in a flexible direct current transmission system and plays a role in connecting the flexible direct current system and an alternating current system. The flexible DC converter station consists of AC field, connecting area, valve hall, DC field and other areas.
Bridge arm reactors (valve reactors) are arranged in bridge arms of the converter valves and mainly act to inhibit circulation among the bridge arm converter valves. In a conventional flexible direct current converter station main wiring system, bridge arm reactors (valve reactors) are arranged on the alternating current side of a converter valve, and each bridge arm has six bridge arm reactors. The wiring of a conventional flexible direct current converter station as shown in fig. 4, and the converter valve is shown by reference numeral (1) in fig. 4. Each converter station has 6 bridge arm reactors (valve reactors) arranged on the alternating current side of the converter valve, and the bridge arm reactors are shown as reference numeral (2) in fig. 2.
Therefore, how to reduce bridge arm reactor equipment resources as much as possible on the premise of not affecting the existing functions of the flexible direct current converter station becomes a problem to be solved in the prior art.
Disclosure of Invention
The invention provides a flexible direct current converter device and a system, which are used for simplifying the wiring mode of a flexible direct current converter station on the premise of not affecting the existing functions of the flexible direct current converter station.
In a first aspect, the present invention provides a flexible dc converter device comprising: three commutation modules; the converter module is connected with a bus bar at the alternating current end and used for converting alternating current at the alternating current end to output direct current; wherein, each conversion module includes: a bridge arm split reactor, a positive bridge arm converter valve and a negative bridge arm converter valve;
a bus bar at the alternating current end is connected with the bridge arm split reactor;
and the positive pole of the bridge arm split reactor is connected with the positive bridge arm converter valve, and the negative pole of the bridge arm split reactor is connected with the negative bridge arm converter valve.
Further, connecting the negative electrode of the positive bridge arm converter valve in each converter module to the negative electrode of the direct current output end;
and connecting the positive electrode of the negative bridge arm converter valve in each converter module to the positive electrode of the direct current output end.
Further, smoothing reactors are respectively arranged on the negative electrode and the positive electrode of the direct current output end.
In a second aspect, the present invention provides a flexible dc converter system comprising: a transformer and a flexible DC converter;
wherein the transformer is connected with the flexible direct current converter device;
the flexible direct current converter device comprises: three commutation modules; the converter module is connected with a bus bar at the alternating-current end of the transformer, and converts alternating current at the alternating-current end to output direct current; wherein, each conversion module includes: a bridge arm split reactor, a positive bridge arm converter valve and a negative bridge arm converter valve;
a bus bar at the alternating current end is connected with the bridge arm split reactor;
and the positive pole of the bridge arm split reactor is connected with the positive bridge arm converter valve, and the negative pole of the bridge arm split reactor is connected with the negative bridge arm converter valve.
Further, the method further comprises the following steps: a switch;
the transformer is connected with the flexible direct current converter through the switch.
Further, connecting the negative electrode of the positive bridge arm converter valve in each converter module to the negative electrode of the direct current output end;
and connecting the positive electrode of the negative bridge arm converter valve in each converter module to the positive electrode of the direct current output end.
Further, smoothing reactors are respectively arranged on the negative electrode and the positive electrode of the direct current output end.
According to the invention, the split reactors are directly connected to the bus bar of the alternating current end, one split reactor replaces the original two bridge arm reactors, the wiring mode of the current converting area of the flexible direct current converter station is simplified on the premise that the existing function of the flexible direct current converter station is not affected, the number of reactor equipment is reduced, the engineering investment is saved, the occupied area of the direct current field of the converter station is saved, and the comprehensive benefit is remarkable.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a converter module according to an embodiment of the present invention;
fig. 2 is a block diagram of a dc converter according to an embodiment of the present invention;
FIG. 3 is a diagram of a flexible DC converter system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the wiring of a conventional flexible dc converter station.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The flexible direct current transmission system can independently change the phase and amplitude of the output voltage, thereby conveniently and rapidly regulating the output active power and reactive power. The power transmission technology has the advantages of being capable of supplying power to a passive network, free of commutation failure, free of communication between converter stations, easy to form a multi-terminal direct current system and the like, and has the advantages of improving the stability of a power system, increasing dynamic reactive power reserve of the system, improving the quality of electric energy, solving the influence of nonlinear load and impact load on the system, guaranteeing the power supply of sensitive equipment and the like. A converter station is a station established in a high-voltage direct-current power transmission system to convert alternating current into direct current or to convert direct current into alternating current, thereby achieving a safe and stable power system. The existing flexible direct current converter station is an important component in a flexible direct current power transmission system and plays a role in connecting the flexible direct current system and an alternating current system. However, when the flexible direct current converter station transmits power, the system loss becomes large, and the engineering investment is increased due to the large number of reactor equipment.
The embodiment of the invention provides a flexible direct current converter device, which comprises a converter module, wherein the converter module is connected with a bus bar of an alternating current end and used for converting alternating current of the alternating current end to output direct current; wherein, the current conversion module includes: a bridge arm split reactor, a positive bridge arm converter valve and a negative bridge arm converter valve;
a bus bar at the alternating current end is connected with the bridge arm split reactor;
and the positive pole of the bridge arm split reactor is connected with the positive bridge arm converter valve, and the negative pole of the bridge arm split reactor is connected with the negative bridge arm converter valve.
Specifically, as shown in fig. 1, fig. 1 is a block diagram of a converter module provided by an embodiment of the present invention, in which a bridge arm split reactor is denoted by numeral 3, and a bus bar connected to the left side of the split reactor is an ac terminal. The positive bridge arm converter valve is represented by a numeral 1, the negative bridge arm converter valve is represented by a numeral 6, a diode is arranged in the positive bridge arm converter valve, and the anode and the cathode of the diode are respectively represented by letters a and b; as can be seen from the figure, where the split reactor 3 is connected to the positive pole of the positive leg converter valve 1 and the split reactor 3 is connected to the negative pole of the negative leg converter valve 6.
According to the embodiment of the invention, the split reactor is directly connected to the bus bar of the alternating current end, one split reactor replaces the original two bridge arm reactors, the wiring mode of the current converting area of the flexible direct current converter station is simplified on the premise that the existing function of the flexible direct current converter station is not affected, the number of reactor equipment is reduced, the engineering investment is saved, the occupied area of the direct current field of the converter station is saved, and the comprehensive benefit is obvious.
Based on the content of the above embodiment, as an alternative embodiment: the flexible direct current converter device comprises three converter modules, wherein the negative electrode of a positive bridge arm converter valve in each converter module is connected to the negative electrode of a direct current output end;
and connecting the positive electrode of the negative bridge arm converter valve in each converter module to the positive electrode of the direct current output end.
Specifically, as shown in fig. 2, fig. 2 is a block diagram of a dc converter device according to an embodiment of the present invention, where the negative electrode of a positive bridge arm converter valve in each converter module is connected, and then connected to the negative electrode of a dc output end, as shown by numeral 8 in the figure: the cathodes of the positive bridge arm converter valves in the converter modules are connected through a connecting wire 8, and then the connecting wire 8 is connected to the cathode of the direct current output end; the positive poles of the negative bridge arm converter valves in the converter modules are connected, and then connected to the positive pole of the direct current output end, as shown by numeral 9 in the figure: the anodes of the negative bridge arm converter valves in the converter modules are connected through a connecting wire 9, and then the connecting wire 9 is connected to the anode of the direct current output end.
According to the embodiment of the invention, the negative electrode of the positive bridge arm converter valve and the positive electrode of the negative bridge arm converter valve in each converter module are respectively connected to the negative electrode and the positive electrode of the direct current output end, so that the effect of rapidly outputting the direct current by the alternating current is achieved.
Based on the content of the above embodiment, as an alternative embodiment: and smoothing reactors are respectively arranged on the negative electrode and the positive electrode of the direct current output end.
Specifically, as shown in fig. 2, numeral 7 indicates a smoothing reactor, and as can be seen from the figure, smoothing reactors are respectively provided on the negative electrode and the positive electrode of the dc power output terminal, and two smoothing reactors are provided in total. The smoothing reactor is used for a direct current transmission end, so that the output direct current is close to ideal direct current.
According to the embodiment of the invention, the smoothing reactor is arranged at the direct current output end, so that ripple waves in the output direct current voltage can be effectively restrained, the output direct current is close to ideal direct current, and instability caused by a direct current circuit is reduced.
According to another aspect of the present invention, an embodiment of the present invention further provides a flexible dc converter system, including: a transformer and a flexible DC converter;
the transformer is connected with the flexible direct current converter;
the flexible direct current converter device includes: three commutation modules; the converter module is connected with a bus bar at the alternating-current end of the transformer, and converts alternating current at the alternating-current end to output direct current; wherein, each conversion module includes: a bridge arm split reactor, a positive bridge arm converter valve and a negative bridge arm converter valve;
a bus bar at the alternating current end is connected with the bridge arm split reactor;
and the positive pole of the bridge arm split reactor is connected with the positive bridge arm converter valve, and the negative pole of the bridge arm split reactor is connected with the negative bridge arm converter valve.
Specifically, as shown in fig. 3, fig. 3 is a diagram of a flexible dc converter system according to an embodiment of the present invention, where the diagram includes a transformer and a flexible dc converter device, the transformer is denoted by numeral 11, the transformer is connected to the flexible dc converter device, the flexible dc converter device is denoted by numeral 10 in the diagram, and the flexible dc converter device 10 includes: three commutation modules, and each commutation module includes: the bridge arm split reactor, the positive bridge arm converter valve and the negative bridge arm converter valve. Wherein, a split reactor is represented by numeral 3, a positive bridge arm converter valve is represented by numeral 1, and a negative bridge arm converter valve is represented by numeral 6.
In the whole flexible direct current converter system, three split reactors, three groups of positive bridge arm converter valves and three groups of negative bridge arm converter valves are all arranged. In addition, in the system, the entire converter valve portion may also be represented by numeral 13, representing all of the converter valves in the system. In the figure, connected to the left of the split reactor is a bus bar of the ac end, the split reactor 3 is connected to the positive pole of the positive bridge arm converter valve 1, and the split reactor 3 is connected to the negative pole of the negative bridge arm converter valve 6.
According to the embodiment of the invention, the split reactors are directly connected to the bus bar of the alternating current end, one split reactor replaces the original two bridge arm reactors, the wiring mode of the current conversion area of the flexible direct current converter station is simplified on the premise that the existing function of the flexible direct current converter station is not affected, the number of reactor equipment is reduced, the engineering investment is saved, the occupied area of the direct current field of the converter station is saved, and the comprehensive benefit is remarkable.
Based on the content of the above embodiment, as an alternative embodiment: further comprises: a switch;
the transformer is connected with the flexible direct current converter through the switch.
In particular, as shown in fig. 3, the switch is denoted by numeral 12, and it can be seen that the transformer 11 is connected to the flexible dc converter device 10 via the switch 12.
The embodiment of the invention provides a power supply for starting the flexible direct current converter device, so that two bridge arms share one split reactor, the function of inhibiting the circulation between bridge arm converter valve groups is reserved, and the wiring mode of the flexible direct current converter station is simplified on the premise of not affecting the existing function of the flexible direct current converter station.
Based on the content of the above embodiment, as an alternative embodiment: connecting the negative electrode of a positive bridge arm converter valve in each converter module to the negative electrode of the direct current output end;
and connecting the positive electrode of the negative bridge arm converter valve in each converter module to the positive electrode of the direct current output end.
Specifically, the cathodes of the positive bridge arm converter valves in the converter modules in the system are connected, and then connected to the cathodes of the direct current output ends, as shown by the numeral 8 in fig. 3, the cathodes of the positive bridge arm converter valves in the converter modules are connected through a connecting wire 8, and then the connecting wire 8 is connected to the cathodes of the direct current output ends; the anodes of the negative bridge arm converter valves in the converter modules are connected and then connected to the anode of the direct current output end, as shown by the numeral 9 in the figure, the anodes of the negative bridge arm converter valves in the converter modules are connected through a connecting wire 9, and then the connecting wire 9 is connected to the anode of the direct current output end.
According to the embodiment of the invention, the negative electrode of the positive bridge arm converter valve and the positive electrode of the negative bridge arm converter valve in each converter module are respectively connected to the negative electrode and the positive electrode of the direct current output end, so that the effect of rapidly outputting the direct current by the alternating current is achieved.
Based on the content of the above embodiment, as an alternative embodiment: and smoothing reactors are respectively arranged on the negative electrode and the positive electrode of the direct current output end.
Specifically, as shown in fig. 3, numeral 7 indicates a smoothing reactor, and as can be seen from the figure, smoothing reactors are provided on the negative electrode and the positive electrode of the dc output terminal, respectively, and two smoothing reactors are provided in total. The smoothing reactor is used for a direct current transmission end, so that the output direct current is close to ideal direct current.
According to the embodiment of the invention, the smoothing reactor is arranged at the direct current output end, so that ripple waves in the output direct current voltage can be effectively restrained, the output direct current is close to ideal direct current, and instability caused by a direct current circuit is reduced.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (5)
1. A flexible dc converter device, the device comprising: three commutation modules; the converter module is connected with a bus bar at the alternating current end and used for converting alternating current at the alternating current end to output direct current; wherein, each conversion module includes: a bridge arm split reactor, a positive bridge arm converter valve and a negative bridge arm converter valve;
a bus bar at the alternating current end is connected with the bridge arm split reactor;
the positive pole of the bridge arm split reactor is connected with the positive bridge arm converter valve, and the negative pole of the bridge arm split reactor is connected with the negative bridge arm converter valve; diodes are arranged in the positive bridge arm converter valve;
connecting the negative electrode of the positive bridge arm converter valve in each converter module to the negative electrode of the direct current output end;
and connecting the positive electrode of the negative bridge arm converter valve in each converter module to the positive electrode of the direct current output end.
2. The apparatus of claim 1, wherein smoothing reactors are provided on the negative and positive poles of the direct current output terminal, respectively.
3. A flexible dc converter system, the system comprising: a transformer and a flexible DC converter;
wherein the transformer is connected with the flexible direct current converter device;
the flexible direct current converter device comprises: three commutation modules; the converter module is connected with a bus bar at the alternating-current end of the transformer, and converts alternating current at the alternating-current end to output direct current; wherein, each conversion module includes: a bridge arm split reactor, a positive bridge arm converter valve and a negative bridge arm converter valve;
a bus bar at the alternating current end is connected with the bridge arm split reactor;
the positive pole of the bridge arm split reactor is connected with the positive bridge arm converter valve, and the negative pole of the bridge arm split reactor is connected with the negative bridge arm converter valve; diodes are arranged in the positive bridge arm converter valve;
connecting the negative electrode of the positive bridge arm converter valve in each converter module to the negative electrode of the direct current output end;
and connecting the positive electrode of the negative bridge arm converter valve in each converter module to the positive electrode of the direct current output end.
4. A system according to claim 3, further comprising: a switch;
the transformer is connected with the flexible direct current converter through the switch.
5. A system according to claim 3, wherein smoothing reactors are provided on the negative and positive poles of the dc output, respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910117756.7A CN109672208B (en) | 2019-02-15 | 2019-02-15 | Flexible direct current converter device and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910117756.7A CN109672208B (en) | 2019-02-15 | 2019-02-15 | Flexible direct current converter device and system |
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| CN109672208A CN109672208A (en) | 2019-04-23 |
| CN109672208B true CN109672208B (en) | 2024-03-26 |
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| CN201910117756.7A Active CN109672208B (en) | 2019-02-15 | 2019-02-15 | Flexible direct current converter device and system |
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| CN113054856B (en) * | 2019-12-27 | 2022-08-23 | 新疆金风科技股份有限公司 | Converter valve tower, converter system and wind generating set |
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| CN109672208A (en) | 2019-04-23 |
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