CN209313433U - A kind of transmission system - Google Patents
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- CN209313433U CN209313433U CN201820946587.9U CN201820946587U CN209313433U CN 209313433 U CN209313433 U CN 209313433U CN 201820946587 U CN201820946587 U CN 201820946587U CN 209313433 U CN209313433 U CN 209313433U
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Abstract
The utility model provides a kind of transmission system, comprising: several first AC/AC converter plants are connect with AC network, and for the first frequency three-phase voltage of AC network to be converted to second frequency two-phase voltage, first frequency is greater than second frequency；Power transmission cable is connect with the first AC/AC converter plant and the second AC system, for AC network to be carried out networking.The first frequency three-phase voltage of AC network is converted to second frequency two-phase voltage by the first AC/AC converter plant by the transmission system, and first frequency is greater than second frequency；The second AC system is transmitted to by power transmission cable later, it is only necessary to which two ac transmission cables can realize low frequency power transmission, reduce the cost of transmission system.
Description
Technical field
The utility model relates to electric system field of power transmission, and in particular to a kind of transmission system.
Background technique
The energy is the important material base of socio-economic development, and Speed-up Establishment is safe and reliable, economical and efficient, clean and environmental protection
Modern energy supply system, it has also become the common strategic objective in countries in the world.In order to effectively solve lack of energy and environmental pollution
Problem develops new energy and has become reply energy security, environmental pollution, climate change three challenges, realizes that human society can be held
The only way of supervention exhibition.Wind-power electricity generation is most mature, on the largest scaleization exploit condition power generation side in new energy power generation technology
One of formula.Some regional wind power resources distributions and load center are in contrary distribution, are needed through large capacity long distance power transmission come real
Existing resource is distributed rationally.
Existing ac transmission be limited by the transmission power limit, system safety and stability, transmission of electricity corridor and cost of investment etc. because
The restriction of element, is difficult to be adapted to the requirement of long-distance and large-capacity power transmission；It is universal in the occasions such as wind-electricity integration, urban electricity supply at sea
Using cable power transmission, cable is there is apparent capacity effect, the Payload energy that can be greatly increased reactive loss, reduce cable
Power, while being difficult to carry out reactive compensation in cable run midway, transmission distance when relatively long distance cable run is using exchange transmission
From limited.It therefore, is the power Transmission under realization large capacity, remote and particular surroundings, low frequency power transmission (Low Frequency
AC Transmission System, abbreviation LFAC) as a kind of novel power transmission mode, by using lower than power frequency (such as 50/
Transmission frequency 3Hz) promotes the transmission capacity of route at double, reduces the electrical distance of alternating current circuit.Especially at sea wind-powered electricity generation
Application scenarios under, compared to flexible DC transmission, marine converter station can be saved using low frequency power transmission, substantially reduce investment at
This.
However, needing the construction of three ac cables and cable when low frequency power transmission is applied to large capacity long distance powedr transmission
Difficulty is big, therefore low frequency power transmission system is at high cost.
Utility model content
Therefore, the technical problem to be solved by the present invention is to overcome in the prior art low frequency power transmission system cost it is high
Defect.
For this purpose, the utility model provides the following technical solutions:
The utility model provides a kind of transmission system, comprising: and several first AC/AC converter plants are connect with AC network,
For the first frequency three-phase voltage of the AC network to be converted to second frequency two-phase voltage, the first frequency is greater than institute
State second frequency；Power transmission cable is connect with the first AC/AC converter plant and the second AC system, is used for the exchange
Power grid carries out networking.
Optionally, the first AC/AC converter plant includes the first AC/AC frequency converter and first switch group, wherein described
The input terminal of first AC/AC frequency converter is connect with the AC network, and the output end of the first AC/AC frequency converter passes through described
First switch group is connect with the power transmission cable.
Optionally, the first AC/AC frequency converter includes at least one set of frequency-variable module, and the frequency-variable module includes two changes
Frequency unit, the input terminal of the converter unit are connect with the AC network, the output end of the converter unit and described first
Switching group connection.
Optionally, the converter unit includes three frequency conversion bridge arms, each described frequency conversion bridge arm includes inductance and H
The first end of bridge, the inductance is connect with the first end of H bridge, input of the second end of the inductance as the frequency conversion bridge arm
End, output end of the second end of the H bridge as the frequency conversion bridge arm；The input terminal of three frequency conversion bridge arms respectively with it is described
A phase, the B phase of AC network are connected with C, and the output end of three frequency conversion bridge arms is connect with the first switch group.
Optionally, the H bridge includes at least one full-control type H bridge.
Optionally, the full-control type H bridge includes two groups of power electronic devices bridge arms and DC capacitor, two groups of electric power electricity
Sub- device bridge arm is connected in parallel, each described power electronic devices bridge arm includes concatenated two power electronic devices, institute
DC capacitor is stated to be connected in parallel with the power electronic devices bridge arm.
Optionally, the power electronic devices include insulated gate bipolar transistor and with the insulated gate bipolar crystal
The voltage rectifier that pipe is connected in parallel.
Optionally, the first switch group is breaker and the disconnecting switch for being set to the breaker both ends.
Optionally, the first frequency is 50Hz, and the second frequency is 50/3Hz.
Optionally, further includes: the 2nd AC/AC converter plant is connect with the power transmission cable and second AC system,
For the second frequency two-phase voltage of the AC network to be converted to third frequency three-phase voltage.
Optionally, further includes: several transformers are corresponded with the first AC/AC converter plant, the transformer point
It is not connect with the first AC/AC converter plant and the AC network, for adjusting the AC network output voltage.
Technical solutions of the utility model have the advantages that
A kind of transmission system provided by the utility model, comprising: several first AC/AC converter plants connect with AC network
It connects, for the first frequency three-phase voltage of the AC network to be converted to second frequency two-phase voltage, the first frequency is big
In the second frequency；Power transmission cable is connect with the first AC/AC converter plant and the second AC system, and being used for will be described
AC network carries out networking.The transmission system passes through the first AC/AC converter plant for the first frequency three-phase voltage of AC network
Second frequency two-phase voltage is converted to, first frequency is greater than second frequency；The second exchange system is transmitted to by power transmission cable later
System, it is only necessary to which two ac transmission cables can realize low frequency power transmission, reduce the cost of transmission system.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram of a specific example of transmission system in the utility model embodiment；
Fig. 2 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Fig. 3 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Fig. 4 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Fig. 5 is the two-phase voltage waveform diagram of transmission system in the utility model embodiment；
Fig. 6 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Fig. 7 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Fig. 8 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Fig. 9 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Figure 10 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Figure 11 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Figure 12 is the schematic diagram of another specific example of transmission system in the utility model embodiment；
Figure 13 is the schematic diagram of another specific example of transmission system in the utility model embodiment.
Appended drawing reference:
1, the first AC/AC converter plant；11, the first AC/AC frequency converter；111, converter unit；1111, inductance；1112,H
Bridge；12, first switch group；121, it switchs；2, AC network；3, power transmission cable；4, the second AC system；5, the 2nd AC/AC becomes
Frequency device；51, second switch group；52, the 2nd AC/AC frequency converter；6, transformer.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can also be the connection inside two elements, can be wireless connection, be also possible to wired connection.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
The present embodiment provides a kind of transmission systems, as shown in Figure 1, comprising:
Several first AC/AC converter plants 1, connect with AC network 2, for by the first frequency three-phase of AC network 2
Voltage is converted to second frequency two-phase voltage, and first frequency is greater than second frequency.The transmission system is applied to large capacity over long distances
The range of transmission of electricity, first frequency and second frequency determines according to practical application, the preferred scope of first frequency be less than or equal to
75Hz, as long as second frequency is less than first frequency, if first frequency is 60Hz, second frequency can be appointing less than 60Hz
One frequency.In the present embodiment, since the work frequency of China's power grid is 50Hz, therefore first frequency is set as 50Hz；Second frequency
Rate is set as 50/3Hz；As transmission frequency reduces, cable current increases, and insulation performance declines therewith, is comprehensively considering it absolutely
The low frequency power transmission frequency of 50/3Hz is used after the influence of many factors such as edge and cost, setting in this way can increase by 3 times of transmission and hold
Amount reduces line impedance, increases transmission range.In the present embodiment, as shown in Fig. 2, including two the first AC/AC converter plants
1；It certainly, in other embodiments, can also include three or more, rationally setting as needed.In this implementation
In example, as shown in figure 3, the three-phase voltage of AC network is expressed as A phase voltage VA, B phase voltage VBWith C phase voltage VC, above-mentioned
The phase difference of three-phase voltage is 120 degree；Two-phase voltage after conversion is expressed as first voltage VMAWith second voltage VMB, on
The phase difference for stating two-phase voltage is 180 degree, and it is convenient that above-mentioned 180 degree phase difference generates, easily controllable.In the present embodiment, it exchanges
Power grid can be the alternating current of the outputs such as power plant, substation or power distribution station, as needed rationally setting.
In the present embodiment, as shown in figure 3, the first AC/AC converter plant 1 includes the first AC/AC frequency converter 11 and first
Switching group 12, wherein the input terminal of the first AC/AC frequency converter 11 is connect with AC network 2, the first AC/AC frequency converter 11 it is defeated
Outlet is connect by first switch group 12 with power transmission cable 3.First switch group is set to the output end of the first AC/AC frequency converter 11
Between power transmission cable 3, so on the one hand the networking between AC network is convenient in setting, and the switch conduction in first switch group is then
AC network accesses transmission system；On the other hand when power transmission cable breaks down, the switch in first switch group is disconnected
So that power transmission cable and AC network disconnect, convenient for the maintenance and repair of power transmission cable.First switch group is according to system protection, inspection
The demand assignments such as repair.In the present embodiment, first switch group 12 includes at least one set of switch, and each group of switch includes two
Switch, each of these switch include breaker and the disconnecting switch for being set to breaker both ends, i.e., breaker is defeated
Enter end to connect with a disconnecting switch, the output end of breaker is connect with a disconnecting switch again, the specific number of switch according to
Actual needs rationally setting.In the present embodiment, as shown in fig. 6, first switch group 12 includes three groups of switches 121, respectively
It is denoted as first group of switch, second group of switch and third group switch, wherein the two-phase voltage output end of the first AC/AC frequency converter 11
It is connect with the first end of first group of switch, the second end of first group of switch is opened with the first end of second group of switch and third group respectively
The first end of pass connects, and second group of switch is connected with third group switch in parallel, the second end of second group of switch and one second friendship
The second end of streaming system connection, third group switch is connect with another second AC system, and the first AC/AC frequency converter 11 can pass through
Two groups of switches (second group of switch and third group switch) two second AC systems of connection in parallel.Certainly, in other embodiments
In, first group of switch as shown in Figure 6 can also be saved, as needed rationally setting.
First AC/AC frequency converter 11 includes at least one set of frequency-variable module, and frequency-variable module includes two converter units 111, is become
The input terminal of frequency unit 111 is connect with AC network 2, and the output end of converter unit 111 is connect with first switch group 12.In this reality
It applies in example, as shown in figure 4, the first AC/AC frequency converter 11 includes one group of frequency-variable module, frequency-variable module includes two converter units
111, converter unit 111 includes three frequency conversion bridge arms, each frequency conversion bridge arm includes inductance 1111 and H bridge 1112, inductance
1111 first end is connect with the first end of H bridge 1112, input terminal of the second end of inductance 1111 as frequency conversion bridge arm, H bridge
Output end of 1112 second end as frequency conversion bridge arm；The input terminal of three frequency conversion bridge arms respectively with the A phase of AC network 2, B phase
It is connected with C, the output end of three frequency conversion bridge arms is connect with first switch group 12.First AC/AC frequency converter 11 is containing 6 by grade
The bridge arm for joining H bridge module composition draws opposite polarity low-frequency ac, two-phase voltage waveform diagram such as Fig. 5 institute from neutral point
Show, voltage between phases always remains as 2 times of peak-to-peak value.
H bridge 1112 includes at least one full-control type H bridge, in the present embodiment, as shown in figure 4, H bridge includes a full-control type
H bridge, full-control type H bridge include two groups of power electronic devices bridge arms and DC capacitor, and two groups of power electronic devices bridge arms are connected in parallel,
Each power electronic devices bridge arm includes concatenated two power electronic devices, DC capacitor and power electronic devices bridge arm
It is connected in parallel；Power electronic devices includes insulated gate bipolar transistor (IGBT) and two pole of back-pressure being connected in parallel with IGBT
Pipe.Certainly, in other embodiments, power electronic devices can also be metal (metal)-oxide (oxide)-semiconductor
(semiconductor) field effect transistor (MOS) pipe or bipolar junction transistor (Bipolar Junction
Transistor is abbreviated as BJT) etc., rationally setting as needed.The voltage that can bear due to a full-control type H bridge
Grade is limited, and the voltage of AC network is higher, therefore multiple full-control type H bridges is needed to be cascaded, as shown in fig. 6, H bridge 1112 wraps
Two full-control type H bridges are included, in other embodiments, the cascade number of full-control type H bridge can be rationally set as needed.
First frequency three-phase voltage can be converted to a second frequency two-phase voltage, second frequency by one group of frequency-variable module
Two-phase voltage is connected to the second AC system by first switch group.When the first switch group 12 connecting with frequency-variable module includes one
When group switch 121, one group of frequency-variable module connects second AC system 4, then the first AC/AC frequency converter 11 connects one second
AC system 4, such networking the latter AC network connect second AC system, as shown in Figure 4.Connect when with frequency-variable module
When the first switch group 12 connect includes at least two groups switch 121, one group of frequency-variable module connects at least two second AC systems 4,
Then the first AC/AC frequency converter 11 connects at least two second AC systems 4, and such networking the latter AC network can connect multiple
Second AC system；As shown in fig. 6, first switch group 12 includes three groups of switches 121, one group of frequency-variable module connects two second friendships
Streaming system 4, therefore the first AC/AC frequency converter 11 is connected in parallel two the second AC systems 4.
Certainly, in other embodiments, the first AC/AC frequency converter 11 may include multiple groups frequency-variable module, an AC network
Multiple groups frequency-variable module can be connected.If the first AC/AC frequency converter 11 includes two groups of frequency-variable modules, i.e. two groups of frequency-variable module parallel connections connect
It connects.When the first switch group 12 connecting with each frequency-variable module includes one group of switch 121, therefore each group of frequency-variable module connection
One the second AC system 4, the first AC/AC frequency converter 11 connect two the second AC systems 4, such networking the latter alternating current
Net can connect multiple second AC systems, as shown in Figure 7.When the first switch group 12 connecting with each frequency-variable module includes extremely
When few two groups of switches 121, each group of frequency-variable module connects at least two second AC systems 4, such networking the latter alternating current
Net can also connect multiple second AC systems；As shown in figure 8, first switch group 12 includes two groups of switches 121, therefore each group of frequency conversion
Module connects two the second AC systems 4, and the first AC/AC frequency converter 11 connects four the second AC systems 4.The transmission system
Specific network construction form is rationally arranged according to the actual conditions of AC network and the second AC system, as shown in figure 9, the transmission of electricity
System includes that four the first AC/AC converter plants form looped network, and specific connection relationship is detailed in attached drawing 9.
Power transmission cable 3 is connect with the first AC/AC converter plant 1 and the second AC system 4, for carrying out AC network 2
Networking.In the present embodiment, the second AC system can set for transmission line of electricity, substation, power transformation route, power distribution station or electricity consumption
It is standby etc., rationally setting as needed.In the present embodiment, power transmission cable 3 is cable, certainly, in other embodiments, also
It can be overhead line etc., rationally setting as needed.
Above-mentioned transmission system is converted to the first frequency three-phase voltage of AC network by the first AC/AC converter plant
Second frequency two-phase voltage, first frequency are greater than second frequency；It is transmitted to the second AC system by power transmission cable later, this is defeated
Electric system only needs two ac transmission cables that can realize low frequency power transmission, saves an alternating low frequency power transmission cable, saves defeated
Electric wire cable cost, reduces the cost of difficulty of construction and transmission system.
In order to increase the networking convenience and operational flexibility of transmission system, on the basis of above-mentioned transmission system, such as scheme
Shown in 10, the transmission system further include: the 2nd AC/AC converter plant 5 is connect with power transmission cable 3 and the second AC system 4, is used
In the second frequency two-phase voltage of AC network 2 is converted to third frequency three-phase voltage.In the present embodiment, due to China's electricity
The frequency of net is 50Hz, therefore third set of frequency is 50Hz, and certainly, in other embodiments, third frequency can be handed over according to second
Rationally it is arranged needed for streaming system, third set of frequency is 75Hz if frequency needed for the second AC system is 75Hz；Second exchange
Frequency needed for system is that then third set of frequency is 30Hz to 30Hz.In the present embodiment, as shown in figure 11, the 2nd AC/AC frequency conversion
Device 5 includes second switch group 51 and the 2nd AC/AC frequency converter 52, and power transmission cable 3 passes through second switch group 51 and the 2nd AC/AC
The input terminal of frequency converter 52 connects, and the output end of the 2nd AC/AC frequency converter 52 is connect with the second AC system 4.2nd AC/AC becomes
The particular circuit configurations of frequency device 52 are similar with the circuit structure of the first AC/AC frequency converter 11, by the defeated of the first AC/AC frequency converter 11
Enter end and output end exchange can be obtained the 2nd AC/AC frequency converter 52, therefore the circuit structure of the 2nd AC/AC frequency converter 52 is herein not
It repeats again；Second switch group 51 is similar with the particular circuit configurations of first switch group 12, and details are not described herein.In alternating current net side
(delivery end) installs the first AC/AC converter plant additional, and three-phase first frequency voltage is converted to the two-phase that frequency is lower than first frequency
Low-frequency voltage transmission reaches the second AC system (receiving end) using the 2nd AC/AC converting means and is converted to three-phase third frequency
Voltage carries out load power supply, to form the exchange networking of low frequency multiterminal.
In order to meet the adjusting between different voltages grade, on the basis of above-mentioned transmission system, as shown in figure 12, this is defeated
Electric system further include:
Several transformers 6 are corresponded with the first AC/AC converter plant 1, and transformer 6 is filled with the first AC/AC frequency conversion respectively
1 and the connection of AC network 2 are set, for adjusting AC network output voltage.In the present embodiment, the first AC/AC converter plant 1
Number is two, therefore the number of transformer 6 is also two；If the voltage of AC network is 220V, by transformer 6 by 220V's
Three-phase alternating voltage boosts to 10kV, therefore transformer is step-up transformer, and reconvert is defeated using high voltage at two-phase voltage later
Electric line carries out low-frequency transmission, high-tension transmission reduce the material of the thermal losses generated by electric current and reduction long distance power transmission at
This.Certainly, in other embodiments, transformer 6 can also boost to different voltage, such as 500kV or 750kV, according to need
Rationally to be arranged；Transformer 6 can also be depressurized to different voltages value, if the voltage value of two-phase alternating current pressure is 220kV, lead to
110kV, 35kV, 10kV or 220V etc. can be depressurized to by crossing transformer 6, as needed rationally setting.In the present embodiment,
Transformer 6 is set between the first AC/AC converter plant 1 and AC network 2, and this set makes the small volume of transformer 6,
Cost is relatively low；Certainly, in other embodiments, transformer 6 also can be set in the first AC/AC converter plant 1 and power transmission cable 3
Between, at this point, transformer is low-frequency transformer, frequency is lower, and the volume of transformer is bigger, and cost is also higher, therefore can be according to need
Rationally to be arranged.If transmission system voltage and the first AC/AC frequency converter are applicable in, voltage is consistent, and the transformer at the system end can be with
It omits, substantially reduces cost.
For different voltages grade needed for meeting the second AC system, on the basis of above-mentioned transmission system, such as Figure 13
Shown, transformer 6 can also be set between the 2nd AC/AC converter plant 5 and the second AC system 4, for adjusting alternating current
Net is delivered to the ac voltage of the second AC system；This set makes the small volume of transformer 6, and cost is relatively low.Certainly,
In other embodiments, transformer 6 also can be set between power transmission cable 3 and the 2nd AC/AC converter plant 5, as needed
Rationally setting.If the second AC system is consistent with the applicable voltage of the 2nd AC/AC frequency converter, the transformer at the system end
It can be omitted, further reduce the cost.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out it is obvious variation or
It changes among the protection scope created still in the utility model.
Claims (11)
1. a kind of transmission system characterized by comprising
Several first AC/AC converter plants, connect with AC network, for by the first frequency three-phase voltage of the AC network
Second frequency two-phase voltage is converted to, the first frequency is greater than the second frequency；
Power transmission cable is connect with the first AC/AC converter plant and the second AC system, for carrying out the AC network
Networking.
2. transmission system according to claim 1, which is characterized in that the first AC/AC converter plant includes the first AC/
AC frequency converter and first switch group, wherein the input terminal of the first AC/AC frequency converter is connect with the AC network, described
The output end of first AC/AC frequency converter is connect by the first switch group with the power transmission cable.
3. transmission system according to claim 2, which is characterized in that the first AC/AC frequency converter includes at least one set
Frequency-variable module, the frequency-variable module include two converter units, and the input terminal of the converter unit is connect with the AC network,
The output end of the converter unit is connect with the first switch group.
4. transmission system according to claim 3, which is characterized in that the converter unit includes three frequency conversion bridge arms, often
One frequency conversion bridge arm includes inductance and H bridge, and the first end of the inductance is connect with the first end of H bridge, the inductance
Input terminal of the second end as the frequency conversion bridge arm, output end of the second end of the H bridge as the frequency conversion bridge arm；
The input terminal of three frequency conversion bridge arms is connected with the A phase of the AC network, B phase and C respectively, three frequency conversions
The output end of bridge arm is connect with the first switch group.
5. transmission system according to claim 4, which is characterized in that the H bridge includes at least one full-control type H bridge.
6. transmission system according to claim 5, which is characterized in that the full-control type H bridge includes two groups of power electronics devices
Part bridge arm and DC capacitor, two groups of power electronic devices bridge arms are connected in parallel, each described power electronic devices bridge arm
It include concatenated two power electronic devices, the DC capacitor is connected in parallel with the power electronic devices bridge arm.
7. transmission system according to claim 6, which is characterized in that the power electronic devices includes insulated gate bipolar
Transistor and the voltage rectifier being connected in parallel with the insulated gate bipolar transistor.
8. according to any transmission system of claim 2-7, which is characterized in that the first switch group be breaker and
It is set to the disconnecting switch at the breaker both ends.
9. -7 any transmission system according to claim 1, which is characterized in that the first frequency is 50Hz, described the
Two frequencies are 50/3Hz.
10. -7 any transmission system according to claim 1, which is characterized in that further include:
2nd AC/AC converter plant is connect with the power transmission cable and second AC system, is used for the AC network
Second frequency two-phase voltage be converted to third frequency three-phase voltage.
11. -7 any transmission system according to claim 1, which is characterized in that further include:
Several transformers, with the first AC/AC converter plant correspond, the transformer respectively with the first AC/AC
Converter plant is connected with the AC network, for adjusting the AC network output voltage.
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| CN201820946587.9U CN209313433U (en) | 2018-06-19 | 2018-06-19 | A kind of transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820946587.9U CN209313433U (en) | 2018-06-19 | 2018-06-19 | A kind of transmission system |
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| CN209313433U true CN209313433U (en) | 2019-08-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649576A (en) * | 2018-06-19 | 2018-10-12 | 全球能源互联网研究院有限公司 | A kind of transmission system |
| CN113098295A (en) * | 2021-04-07 | 2021-07-09 | 全球能源互联网研究院有限公司 | AC-AC converter |
| WO2021146995A1 (en) * | 2020-01-22 | 2021-07-29 | Abb Power Grids Switzerland Ag | Apparatus and method of power transmission |
| CN113937995A (en) * | 2021-09-17 | 2022-01-14 | 南京南瑞继保电气有限公司 | Soft start method of low-frequency power transmission system and storage medium |
| CN114498711A (en) * | 2022-01-12 | 2022-05-13 | 国网浙江省电力有限公司电力科学研究院 | Low-frequency power transmission system and control mode thereof |
| CN114530885A (en) * | 2022-02-28 | 2022-05-24 | 国网江苏省电力有限公司丹阳市供电分公司 | Network-building type flexible interconnection device and control method thereof |
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2018
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| CN108649576A (en) * | 2018-06-19 | 2018-10-12 | 全球能源互联网研究院有限公司 | A kind of transmission system |
| WO2021146995A1 (en) * | 2020-01-22 | 2021-07-29 | Abb Power Grids Switzerland Ag | Apparatus and method of power transmission |
| CN113098295A (en) * | 2021-04-07 | 2021-07-09 | 全球能源互联网研究院有限公司 | AC-AC converter |
| CN113937995A (en) * | 2021-09-17 | 2022-01-14 | 南京南瑞继保电气有限公司 | Soft start method of low-frequency power transmission system and storage medium |
| CN113937995B (en) * | 2021-09-17 | 2023-08-08 | 南京南瑞继保电气有限公司 | Soft start method and storage medium of low-frequency power transmission system |
| CN114498711A (en) * | 2022-01-12 | 2022-05-13 | 国网浙江省电力有限公司电力科学研究院 | Low-frequency power transmission system and control mode thereof |
| WO2023134225A1 (en) * | 2022-01-12 | 2023-07-20 | 国网浙江省电力有限公司电力科学研究院 | Low-frequency power transmission system and control mode therefor |
| CN114498711B (en) * | 2022-01-12 | 2024-03-19 | 国网浙江省电力有限公司电力科学研究院 | Low-frequency power transmission system and control mode thereof |
| CN114530885A (en) * | 2022-02-28 | 2022-05-24 | 国网江苏省电力有限公司丹阳市供电分公司 | Network-building type flexible interconnection device and control method thereof |
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