CN217238953U - Direct current transmission test prototype based on uncontrolled rectification - Google Patents

Direct current transmission test prototype based on uncontrolled rectification Download PDF

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Publication number
CN217238953U
CN217238953U CN202123446050.7U CN202123446050U CN217238953U CN 217238953 U CN217238953 U CN 217238953U CN 202123446050 U CN202123446050 U CN 202123446050U CN 217238953 U CN217238953 U CN 217238953U
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unit
converter
rectification
mmc
direct current
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张�浩
彭国平
史奔
王红占
白代兵
刘会民
李立冬
宋海军
周治国
王博
袁小波
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Guangdong Anpu Electric Power Technology Co ltd
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Guangdong Anpu Electric Power Technology Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

A direct current transmission test prototype based on uncontrolled rectification comprises: the wind power simulation system comprises a first converter and a second converter; the first converter and the second converter are connected back to back; a back-to-back connection structure formed by the first converter and the second converter is connected between the alternating current power grid and the diode valve rectifying unit; the input end of the diode valve rectifying unit is connected with the output end of the wind power simulation system; the input end of the MMC current conversion unit is connected with the output end of the diode valve rectification unit, and the output end of the MMC current conversion unit is used for connecting an alternating current power grid; and the control system is respectively connected with the first converter, the second converter, the diode valve rectifying unit and the MMC current converting unit. The utility model discloses a wind-powered electricity generation analog system can accomplish the running state simulation to marine transmission system under experimental environment to finally reach the purpose that utilizes experimental data auxiliary construction actual marine transmission system.

Description

Direct current transmission test prototype based on uncontrolled rectification
Technical Field
The utility model belongs to marine transmission of electricity is experimental, concretely relates to experimental model machine of direct current transmission of electricity based on uncontrollable rectification.
Background
Offshore wind power development has gained wide attention as a novel clean energy, and global energy transformation provides a wide market space for the development of the offshore wind power. In order to better utilize offshore wind energy resources, offshore wind power projects in China are gradually developed towards deep sea and far sea, but offshore wind power generation with the more distant sites needs higher and higher technical conditions, and the cost is also increased continuously. The traditional alternating current scheme cannot meet the requirement of large-scale offshore wind power transmission in deep open sea, so that large-scale development of offshore wind power is limited, and the direct current transmission technology becomes the only alternative for the deep open sea wind power transmission by referring to the experience of European regions with the fastest global development. The MMC converter-based flexible direct current transmission has more and more widely applied to the aspects of onshore direct current transmission and the like due to the advantages of independent active and reactive decoupling control, capability of accessing a weak power grid, fast dynamic response, excellent harmonic characteristics and the like. The wind power station can meet the requirements of a wind power station sending-out system of a far-sea shore, but has the severe problems of overhigh construction cost, large size of an offshore platform, long construction period, high later maintenance cost and the like, and the large-scale development of deep and far-sea wind power is seriously hindered. Moreover, the distributed direct-current transmission of the offshore wind power based on uncontrolled rectification is used as a novel direct-current transmission scheme of the offshore wind power, so that the system cost and the operation loss are greatly reduced, the system reliability is improved, and the development requirements of deep and open sea wind power are greatly met. However, the scheme is still in the theoretical research stage, so more theoretical verifications are needed to reduce the risk in the actual building process.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides an experimental model machine of direct current transmission based on uncontrollable rectification, the experimental model machine of direct current transmission based on uncontrollable rectification can provide theoretical verification basis for buildding based on the distributed direct current transmission system of marine wind power of uncontrollable rectification.
According to the utility model discloses experimental model machine of direct current transmission based on uncontrollable rectification, include:
the wind power simulation system comprises a first converter and a second converter; the first converter and the second converter are connected back to back; the input end of a back-to-back connection structure formed by the first converter and the second converter is connected with the alternating current power grid, and the output end of the back-to-back connection structure is connected with the input end of the diode valve rectifying unit;
the input end of the diode valve rectifying unit is connected with the output end of the wind power simulation system and used for converting alternating current output by the wind power simulation system into direct current;
the input end of the MMC current conversion unit is connected with the output end of the diode valve rectifying unit, and the output end of the MMC current conversion unit is used for being connected with the alternating current power grid and converting direct current output by the diode valve rectifying unit into alternating current and inputting the alternating current power grid;
and the control system is respectively connected with the first converter, the second converter, the diode valve rectifying unit and the MMC current converting unit.
According to the utility model discloses experimental model machine of direct current transmission based on uncontrollable rectification has following technological effect at least: the wind power simulation system can simulate the running state of a fan on the sea, the alternating current output by the wind power simulation system can be converted from alternating current to direct current and from direct current to alternating current by the diode valve rectification unit and the MMC current conversion unit under the control of the control system, the effect of simulating the transmission of the electricity generated by the fan on the sea is achieved, the running state simulation of the offshore power transmission system can be completed under the experimental environment, and the aim of utilizing experimental data to assist in building the actual offshore power transmission system is finally achieved.
According to some embodiments of the utility model, above-mentioned experimental model machine of direct current transmission based on uncontrollable rectification still includes distribution system, distribution system has first generating line, second generating line, third generating line, first generating line with between the second generating line with all be connected with bus cross-over connection switch unit between the third generating line, first generating line, second generating line, third generating line all are connected with a plurality of distribution switch units, back to back connection structure's output passes through distribution switch unit with first generating line is connected, diode valve rectifier unit's input passes through distribution switch unit with the second generating line is connected, MMC current conversion unit's output with alternating current network is through different distribution switch unit with the third generating line is connected.
According to the utility model discloses a some embodiments, above-mentioned experimental model machine of direct current transmission based on uncontrollable rectification still includes auxiliary power supply unit, auxiliary power supply unit's input passes through distribution switch unit with the third generating line is connected, auxiliary power supply unit's output all passes through distribution switch unit with the second generating line is connected.
According to some embodiments of the invention, the diode valve rectifying unit comprises:
the input end of the rectifier transformer is connected with the output end of the back-to-back connection structure;
and the input end of the diode rectifier valve is connected with the output end of the rectifier transformer, and the output end of the diode rectifier valve is connected with the input end of the MMC commutation unit.
According to some embodiments of the invention, the diode valve rectification unit further comprises a smoothing reactor connected between the output of the diode rectification valve and the input of the MMC converter unit.
According to some embodiments of the invention, the diode valve rectification unit further comprises a passive filter connected at the rectifier transformer input.
According to the utility model discloses a some embodiments, MMC current conversion unit includes 6 bridge arms, 6 the bridge arm all includes a plurality of power module of establishing ties in proper order, and is a plurality of power module all is used for the alternating current of direct current to pass through the galvanic current.
According to some embodiments of the present invention, the output of the MMC current conversion unit and the ac power grid have connected gradually a soft start unit, a connection transformer therebetween.
According to some embodiments of the utility model, above-mentioned experimental model machine of direct current transmission based on uncontrollable rectification still including being connected the output of diode valve rectification unit with power consumption device between the input of MMC current conversion unit.
According to the utility model discloses a some embodiments, above-mentioned experimental model machine of direct current transmission based on do not control the rectification still includes:
one end of the short-circuit reactor is used for grounding;
and one end of the short-circuit switch unit is connected with the other end of the short-circuit reactor, and the other end of the short-circuit switch unit is connected with the output end of the back-to-back connection structure or the output end of the MMC current conversion unit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a system diagram of a dc transmission test prototype based on uncontrolled rectification according to an embodiment of the present invention;
fig. 2 is a system diagram of a diode valve rectification unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a passive filter according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a diode rectifier valve according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an MMC converter cell according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a power module of an embodiment of the invention;
fig. 7 is a schematic diagram of an auxiliary power supply unit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a wind power simulation system according to an embodiment of the present invention.
Reference numerals are as follows:
wind power simulation system 100, first converter 110, second converter 120,
A diode valve rectifying unit 200, a rectifier transformer 210, a diode rectifying valve 220, a smoothing reactor 230, a passive filter 240, a shunt reactor 250,
MMC converter cell 300, power module 310, soft start unit 320, coupling transformer 330,
Power distribution system 400, bus bar jumper switch unit 410, power distribution switch unit 420,
An auxiliary power supply unit 500,
Short-circuit reactor 610, short-circuit switch unit 620.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.
The following describes a dc transmission test prototype based on uncontrolled rectification according to an embodiment of the present invention with reference to fig. 1 to 8. The direct current transmission test prototype based on uncontrolled rectification comprises: the system comprises a wind power simulation system 100, a diode valve rectification unit 200, an MMC commutation unit 300 and a control system.
The wind power simulation system 100 comprises a first converter 110 and a second converter 120; the first converter 110 and the second converter 120 are connected back to back; the input end of the back-to-back connection structure formed by the first converter 110 and the second converter 120 is connected with an alternating current power grid, and the output end is connected with the input end of the diode valve rectifying unit 200;
the input end of the diode valve rectifying unit 200 is connected with the output end of the wind power simulation system 100, and is used for converting the alternating current output by the wind power simulation system 100 into direct current;
the input end of the MMC current conversion unit 300 is connected with the output end of the diode valve rectification unit 200, and the output end of the MMC current conversion unit is used for connecting an alternating current power grid and converting direct current output by the diode valve rectification unit 200 into alternating current power and inputting the alternating current power grid;
and the control system is respectively connected with the first converter 110, the second converter 120, the diode valve rectifying unit 200 and the MMC commutation unit 300.
Referring to fig. 1 to 8, the wind power simulation system 100 may simulate the power generation condition of an offshore wind turbine. One end of a back-to-back connection structure formed by the first converter 110 and the second converter 120 is connected with an alternating current power grid, so that external alternating current can be introduced, the structural characteristics of the back-to-back connection structure are recycled, and therefore common power frequency alternating current can be simulated into offshore wind power generated by an offshore wind turbine under the control of a control system, and the purpose of simulating power generation of the offshore wind turbine is achieved. It should be noted that, during actual operation, the actual wind power generator can be directly utilized to generate wind power, and wind power can be directly output, and the purpose of outputting offshore wind power can also be achieved, but the cost is higher than that of the first converter 110 and the second converter 120, the occupied space is larger, and the requirement on the experimental environment is higher. In some embodiments, the back-to-back connection structure may be multiple, forming multiple feeders, to simulate the effect of multiple fans operating.
The diode valve rectifying unit 200 can simulate an offshore converter platform, rectify the offshore wind power output by the back-to-back connection structure into direct current, and then output the direct current to the MMC converter unit 300 through a high-voltage cable. This process simulates the offshore remote dc transmission process.
The MMC current conversion unit 300 serves as an onshore current conversion platform, converts the direct current output by the offshore current conversion platform simulated by the diode valve rectification unit 200 into alternating current, and is connected to an alternating current power grid, so that the whole simulation process is completed. It should be noted that, because of the analog platform, the ac power input to the ac grid can be re-transmitted back to the ac analog system 100 to be circulated.
According to the utility model discloses experimental model machine of direct current transmission based on uncontrollable rectification, can simulate the fan at the state of marine operation through wind-powered electricity generation analog system 100, diode valve rectification unit 200 and MMC commutation unit 300 can exchange the alternating current of wind-powered electricity generation analog system 100 output under control system's control to the conversion of direct current and direct current to exchanging, reach the effect that the electricity that the simulation fan sent out carries out the transmission at sea, thereby can accomplish the running state simulation to marine transmission system under experimental environment, and finally reach the purpose that utilizes experimental data auxiliary construction actual marine transmission system.
In some embodiments of the present invention, the above-mentioned experimental prototype of direct current transmission based on uncontrolled rectification still includes distribution system 400, refer to fig. 1, distribution system 400 has first generating line, the second generating line, the third generating line, between first generating line and the second generating line, all be connected with bus cross-over connection switch unit 410 between second generating line and the third generating line, first generating line, the second generating line, the third generating line all is connected with a plurality of distribution switch units 420, wind-powered electricity generation analog system 100's output passes through distribution switch unit 420 and is connected with first generating line, diode valve rectifier unit 200's input passes through distribution switch unit 420 and is connected with the second generating line, MMC current conversion unit 300's output and alternating current network are connected with the third generating line through different distribution switch units 420.
The power distribution system 400 actually comprises a plurality of power distribution switch units 420 and a bus jumper switch unit 410, wherein the plurality of power distribution switch units 420 are connected through a first bus, a second bus and a third bus, and referring to fig. 1, the first bus and the second bus, and the second bus and the third bus are also interconnected through the bus jumper switch unit 410. The first bus is mainly used for connecting a fault simulation system formed by the short-circuit reactor 610 and the short-circuit switch unit 620 with a fan simulation system (or an actual wind driven generator), the second bus is used for connecting the diode valve rectifying unit 200, so that offshore wind power output by the fan simulation system can be rectified into alternating current, the third bus is used for connecting the MMC converter unit 300 with an alternating current power grid, and therefore the MMC converter unit 300 can convert the direct current converted by the diode valve rectifying unit 200 into the alternating current. It should be noted that, after the fan simulation system is started, the bus cross-over switch unit 410 between the second bus and the third bus is disconnected, so as to prevent the ac power from being directly transmitted to the ac power grid through the bus cross-over switch unit 410, and thus the verification data cannot be obtained.
In some embodiments of the present invention, referring to fig. 1 and fig. 7, the above-mentioned dc transmission test prototype based on uncontrolled rectification further includes an auxiliary power supply unit 500, an input end of the auxiliary power supply unit 500 is connected to the third bus through the distribution switch unit 420, and an output end of the auxiliary power supply unit 500 is connected to the second bus through the distribution switch unit 420. The auxiliary power supply unit 500 is mainly used when the wind turbine simulation system or the actual wind turbine is normally started, to assist the wind turbine simulation system or the actual wind turbine to complete power supply of the peripheral system. Referring to fig. 7, the auxiliary power supply unit 500 may be configured to connect two converters back to back, one end of the two converters being connected to the ac power grid for supplying power, and the other end of the two converters being connected to the second bus. It should be noted that, after the fan simulation system or the actual wind turbine is started, the auxiliary power supply unit 500 is stopped. In addition, if the simulation of the black start condition is required, the auxiliary power supply unit 500 may be eliminated or the auxiliary power supply unit 500 may not be used. In some embodiments, the distribution switch unit 420 and the bus bar jumper switch unit 410 may be implemented using circuit breakers.
In some embodiments of the present invention, referring to fig. 1 to 4, the diode valve rectification unit 200 includes: rectifier transformer 210, diode rectifier valve 220. A rectifier transformer 210, the input end of which is connected with the output end of the back-to-back connection structure; and the input end of the diode rectifier valve 220 is connected with the output end of the rectifier transformer 210, and the output end of the diode rectifier valve is connected with the input end of the MMC commutation unit 300. As shown in fig. 2, the diode rectifier valve 220 is formed by cascading two 12-pulse rectifiers, and a rectifier transformer 210 (a three-winding rectifier transformer can be used, and a Y/Δ type can be configured) is disposed on the ac side of each 12-pulse rectifier. The fan simulation system side is Y type wiring type, but the earthing device is regarded as the ground point of wind-powered electricity generation field after the neutral point is drawn forth. Each group of 12-pulse rectifier is formed by cascading two 6-pulse rectifiers, the direct current sides are connected in series, and the alternating current sides are respectively connected with the Y winding and the delta winding of the three-winding rectifier transformer.
In some embodiments of the present invention, referring to fig. 2 and 4, the dc side of the 12-pulse rectifier is connected in parallel to a bypass switch, when a fault occurs, the bypass switch is closed, the fault loop bypass can be connected, and the matching function selection switch can play a better protection and troubleshooting role. In some embodiments, as shown in fig. 2 and 4, two 6-pulse rectifiers are cascaded through two switches QS2 and QS3, and a bypass switch is connected in parallel to the dc side of each of the two 6-pulse rectifiers. That is, the bypass switch can be selectively provided on the dc side of the 12-pulse rectifier or the 6-pulse rectifier according to experimental requirements.
In some embodiments of the present invention, referring to fig. 1-4, the diode valve rectifying unit 200 further comprises a smoothing reactor 230 connected between the output of the diode rectifying valve 220 and the input of the MMC converter unit 300.
In some embodiments of the present invention, referring to fig. 1 to 3, the diode valve rectification unit 200 further includes a passive filter 240 connected to an input end of the rectifier transformer 210. The passive filter 240 can be configured with two groups of single-tuned filters, and the filtering frequency can be selected from 11 times and 13 times; meanwhile, the diode valve rectifying unit 200 is additionally provided with a set of shunt reactors 250, and reactive load of the passive filter 240 is offset at the initial time. In some embodiments of the present invention, the shunt reactor 250 and the two sets of single tuned filters are connected to the second bus through the distribution switch unit 420, so as to filter the input end of the rectifier transformer 210.
In some embodiments of the present invention, referring to fig. 1, 5 and 6, the MMC current converting unit 300 includes 6 bridge arms, each of the 6 bridge arms includes a plurality of power modules 310 connected in series in sequence, and each of the plurality of power modules 310 is used for alternating current to direct current. The power module 310 adopts a half-bridge structure and/or a full-bridge structure, and the specific structure is shown in fig. 6. Each bridge arm is connected with a bridge arm reactor in series.
It should be noted that, the MMC current converting unit 300 may adopt different structural types according to different voltage classes, the high voltage system may adopt a valve tower structure, the medium voltage system may adopt a container structure, and the low voltage system may adopt a cabinet structure.
In some embodiments of the present invention, referring to fig. 1 and 5, a soft start unit 320 and a coupling transformer 330 are sequentially connected between the output end of the MMC converter unit 300 and the ac power grid. The connection transformer 330 can be considered to be configured in a Y/delta connection mode, the valve side is in star connection, and the neutral point is connected with grounding equipment after being led out, so that the only grounding point of the direct current transmission scheme test prototype is realized. The soft start unit 320 may implement a soft start and stop after normal operation.
In some embodiments of the present invention, the above dc transmission test prototype based on uncontrolled rectification further includes an energy dissipation device connected between the output terminal of the diode valve rectification unit 200 and the input terminal of the MMC current conversion unit 300. The dc energy dissipation device is configured at the dc port of the MMC current converting unit 300, and the dc energy dissipation device may be composed of a sub-module valve set and a centralized resistor, so as to complete the energy consumption in the loop, and is used to assist the experiment requiring the participation of the load.
In some embodiments of the present invention, referring to fig. 1, the above dc power transmission test prototype based on uncontrolled rectification further includes: short-circuit reactor 610, short-circuit switch unit 620. The short-circuit reactor 610 and the short-circuit switch unit 620 constitute a fault simulation system. A short-circuit reactor 610 having one end for grounding; and a short-circuit switch unit 620 having one end connected to the other end of the short-circuit reactor 610 and the other end connected to the output terminal of the back-to-back connection structure or the output terminal of the MMC converter unit 300. The short circuit switching unit 620 may employ a three-phase circuit breaker, and different ac fault types, such as a three-phase short circuit fault, a single-phase ground fault, etc., may be manufactured by changing an open state of the three-phase circuit breaker. The fault simulation system can be connected to a single fan feeder line of a wind power plant, a wind power plant bus (which can be connected with a first bus or a second bus), an MMC side alternating current power grid (which can be connected with a third bus) and the like, and different fault types can be simulated.
In some embodiments of the present invention, the control system may adopt a plurality of controllers to perform cooperative control, for example: the fan simulation system, the diode valve rectification unit 200 and the MMC converter unit 300 all adopt separate controllers to respectively complete the control of respective normal operation, and meanwhile, the controllers need to be communicated with each other to complete the cooperation. The controller core may directly employ a PLC, such as the S7 series PLC of Siemens. It should be noted that, when the fan simulation system, the diode valve rectifying unit 200, and the MMC commutation unit 300 do not need to simulate a complex system, one controller may be used to complete the control of all devices to be controlled.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and those skilled in the art can understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A direct current transmission test prototype based on uncontrolled rectification is characterized by comprising:
the wind power simulation system (100) comprises a first converter (110) and a second converter (120); the first current transformer (110) and the second current transformer (120) are connected back to back; the input end of a back-to-back connection structure formed by the first converter (110) and the second converter (120) is connected with an alternating current power grid;
the input end of the diode valve rectifying unit (200) is connected with the output end of the back-to-back connection structure and is used for converting alternating current output by the wind power simulation system (100) into direct current;
the input end of the MMC commutation unit (300) is connected with the output end of the diode valve rectification unit (200), and the output end of the MMC commutation unit is used for being connected with the alternating current power grid and converting the direct current output by the diode valve rectification unit (200) into alternating current and inputting the alternating current power grid;
and the control system is respectively connected with the first converter (110), the second converter (120), the diode valve rectifying unit (200) and the MMC commutation unit (300).
2. The uncontrolled rectification based direct current transmission test prototype according to claim 1, characterized by further comprising a power distribution system (400), the power distribution system (400) is provided with a first bus bar, a second bus bar and a third bus bar, wherein a bus bar bridging switch unit (410) is connected between the first bus bar and the second bus bar and between the second bus bar and the third bus bar, the first bus, the second bus and the third bus are all connected with a plurality of distribution switch units (420), the output end of the back-to-back connection structure is connected with the first bus bar through the distribution switch unit (420), the input end of the diode valve rectifying unit (200) is connected with the second bus through the distribution switch unit (420), the output end of the MMC commutation unit (300) and the alternating current power grid are connected with the third bus through different distribution switch units (420).
3. The uncontrolled rectification based direct current transmission test prototype according to claim 2, characterized in that it further comprises an auxiliary power supply unit (500), wherein the input of the auxiliary power supply unit (500) is connected to the third bus through the distribution switch unit (420), and the output of the auxiliary power supply unit (500) is connected to the second bus through the distribution switch unit (420).
4. The uncontrolled rectification based direct current transmission test prototype according to claim 1, characterized in that the diode valve rectification unit (200) comprises:
a rectifier transformer (210) having an input connected to an output of the back-to-back connection;
and the input end of the diode rectifier valve (220) is connected with the output end of the rectifier transformer (210), and the output end of the diode rectifier valve is connected with the input end of the MMC commutation unit (300).
5. The uncontrolled rectification based direct current transmission test prototype according to claim 4, characterized in that the diode valve rectification unit (200) further comprises a smoothing reactor (230) connected between the output of the diode rectification valve (220) and the input of the MMC commutation unit (300).
6. The uncontrolled rectification based direct current transmission test prototype according to claim 4, characterized in that the diode valve rectification unit (200) further comprises a passive filter (240) connected to the input of the rectifier transformer (210).
7. The uncontrolled rectification based direct current transmission test prototype according to claim 1, characterized in that the MMC commutation cell (300) comprises 6 legs, each of the 6 legs comprises a plurality of power modules (310) connected in series in sequence, and each of the plurality of power modules (310) is used for alternating direct current to alternating current.
8. The direct current transmission test prototype based on uncontrolled rectification according to claim 1, characterized in that a soft start unit (320) and a coupling transformer (330) are connected between the output of the MMC converter unit (300) and the alternating current network in sequence.
9. The uncontrolled rectification based direct current transmission test prototype according to claim 1, characterized by further comprising energy consuming devices connected between the output of the diode valve rectification unit (200) and the input of the MMC commutation unit (300).
10. The direct-current transmission test prototype based on uncontrolled rectification according to claim 1, characterized by further comprising:
a short-circuit reactor (610) having one end for grounding;
and one end of the short-circuit switch unit (620) is connected with the other end of the short-circuit reactor (610), and the other end of the short-circuit switch unit is connected with the output end of the back-to-back connection structure or the output end of the MMC commutation unit (300).
CN202123446050.7U 2021-12-30 2021-12-30 Direct current transmission test prototype based on uncontrolled rectification Active CN217238953U (en)

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