CN111800027B - Current conversion device and direct current transmission system - Google Patents
Current conversion device and direct current transmission system Download PDFInfo
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- CN111800027B CN111800027B CN202010674252.8A CN202010674252A CN111800027B CN 111800027 B CN111800027 B CN 111800027B CN 202010674252 A CN202010674252 A CN 202010674252A CN 111800027 B CN111800027 B CN 111800027B
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without 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
- H02M7/217—Conversion of ac power input into dc power output without 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
- H02M7/219—Conversion of ac power input into dc power output without 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 in a bridge configuration
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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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Abstract
The application discloses a current conversion device and a direct current transmission system, wherein the current conversion device comprises a rectification type current converter, a first voltage source current converter and a second voltage source current converter, wherein the rectification type current converter comprises a two-phase uncontrolled rectification type current converter and a two-phase controlled rectification type current converter; the N1 SM modules of the first voltage source converter are sequentially connected in series to form a first phase branch for transmitting reverse energy; the N2 rectifier modules of the rectifier type current converter are sequentially connected in series to form a second-phase branch circuit, and the N3 rectifier modules of the rectifier type current converter are sequentially connected in series to form a third-phase branch circuit for transmitting forward energy; the first end of the first phase branch, the first end of the second phase branch and the first end of the third phase branch are connected with the first end of the second voltage source converter, and the second end of the first phase branch, the second end of the second phase branch and the second end of the third phase branch are connected with the direct current circuit; the second terminal of the second voltage source converter is connected to ground.
Description
Technical Field
The application relates to the technical field of direct current transmission, in particular to a current conversion device and a direct current transmission system.
Background
With the continuous development of world economy, the problems of energy shortage, environmental pollution and the like become more severe, and all countries begin to optimize energy structures and vigorously develop renewable energy. New energy power generation such as wind power, solar energy, biomass energy and the like becomes a research hotspot for development of new energy in the world.
The current common new energy grid-connected direct-current power transmission system comprises a direct-current power transmission system of an MMC type voltage source converter and a direct-current power transmission system adopting a diode rectifier. However, as the voltage level of the direct current transmission system of the existing MMC type voltage source converter is improved, the number of submodules of the MMC is greatly increased, the size and the weight of the converter are increased, and the construction cost is higher. The existing direct current transmission system adopting the diode rectifier can reduce the size and the weight of the converter, but the diode rectifier does not have an inversion function, can not provide reverse energy, and can not realize black start of a new energy power plant.
Disclosure of Invention
The application provides a current conversion device and a direct current transmission system for solve the technical problem that the existing direct current transmission system does not have an inversion function and cannot realize black start of a new energy power plant.
The first aspect of the present application provides a converter device, which includes a rectification type converter, a first voltage source converter and a second voltage source converter, wherein the rectification type converter includes a two-phase uncontrolled rectification type converter and a two-phase controlled rectification type converter;
the N1 SM modules of the first voltage source converter are sequentially connected in series to form a first phase branch for transmitting reverse energy;
the N2 rectifying modules of the rectifying type current converter are sequentially connected in series to form a second-phase branch circuit, and the N3 rectifying modules of the rectifying type current converter are sequentially connected in series to form a third-phase branch circuit for transmitting forward energy;
the first end of the first phase branch, the first end of the second phase branch and the first end of the third phase branch are connected with the first end of the second voltage source converter, and the second end of the first phase branch, the second end of the second phase branch and the second end of the third phase branch are connected with a direct current line;
a second terminal of the second voltage source converter is connected to ground.
Optionally, the second voltage source converter is a three-phase MMC type voltage source converter.
Optionally, the number of the first voltage source converters is plural;
a plurality of said first voltage source converters are connected in series in sequence.
Optionally, the number of the second voltage source converters is plural;
a plurality of said second voltage source converters are connected in series in sequence.
A second aspect of the present application provides a direct current transmission system, including a sending end converter device and a receiving end converter device, where the sending end converter device is connected to the receiving end converter device through a direct current line, and the sending end converter device is the converter device of the first aspect of the present application.
Optionally, the sending end converter device further includes a first transformer and a second transformer;
the first end of the first transformer is connected with the third end of the first phase branch, the third end of the second phase branch and the third end of the third phase branch, and the second end of the first transformer is connected with new energy power generation equipment;
and the first end of the second transformer is connected with the third end of the second voltage source converter, and the second end of the second transformer is connected with the new energy power generation equipment.
Optionally, the number of the first transformers is two.
Optionally, the receiving end converter device comprises a third voltage source converter and a third transformer;
the first end of the third voltage source converter is connected with the first end of the third transformer, the second end of the third voltage source converter is connected with the direct current line, and the third end of the third voltage source converter is grounded;
and the second end of the third transformer is connected with a power grid.
Optionally, the third voltage source converter comprises a three-phase MMC type voltage source converter.
Optionally, the direct current transmission line includes a first smoothing reactor, a resistor, and a second smoothing reactor;
the first end of the first smoothing reactor is connected with the sending end converter device, and the second end of the first smoothing reactor is connected with the first end of the resistor;
the second end of the resistor is connected with the first end of the second smoothing reactor;
and the second end of the second smoothing reactor is connected with the receiving end converter device.
According to the technical scheme, the method has the following advantages:
the application discloses a current conversion device, which comprises a rectification type current converter, a first voltage source current converter and a second voltage source current converter, wherein the rectification type current converter comprises a two-phase uncontrolled rectification type current converter and a two-phase controlled rectification type current converter; the N1 SM modules of the first voltage source converter are sequentially connected in series to form a first phase branch for transmitting reverse energy; the N2 rectifier modules of the rectifier type current converter are sequentially connected in series to form a second-phase branch circuit, and the N3 rectifier modules of the rectifier type current converter are sequentially connected in series to form a third-phase branch circuit for transmitting forward energy; the first end of the first phase branch, the first end of the second phase branch and the first end of the third phase branch are connected with the first end of the second voltage source converter, and the second end of the first phase branch, the second end of the second phase branch and the second end of the third phase branch are connected with the direct current circuit; the second terminal of the second voltage source converter is connected to ground.
In the application, N2 rectifier modules of a rectifier type converter are sequentially connected in series to form a second phase branch, N3 rectifier modules are sequentially connected in series to form a third phase branch for transmitting forward energy, when a new energy power plant stably operates and starts to send active power, the rectifier type converter is used for realizing energy forward transmission, N1 SM modules of a first voltage source converter are sequentially connected in series to form a first phase branch for transmitting reverse energy, when the new energy power plant needs to absorb the active power from a power grid during starting, a two-phase uncontrolled rectifier or a two-phase rectifier is not conducted in a phase control mode, the characteristic of energy reverse transmission is realized by using the first voltage source converter, active power is provided for the new energy power plant, the new energy power plant can be started in a black mode, the first voltage source converter and the rectifier type converter are connected in parallel and then connected in series with the second voltage source converter, and the problem that an existing direct current transmission system does not have an inversion function is solved, the technical problem of black start of a new energy power plant cannot be realized.
Drawings
Fig. 1 is a first structural schematic diagram of a converter according to an embodiment of the present application;
fig. 2 is a second structural schematic diagram of a converter according to an embodiment of the present application;
fig. 3 is a half-bridge topology structure diagram of an SM module of a converter according to an embodiment of the present disclosure;
fig. 4 is a full-bridge topology structure diagram of an SM module of a converter according to an embodiment of the present application;
fig. 5 is a topology structure diagram of a three-phase MMC voltage source converter according to an embodiment of the present disclosure;
fig. 6 is a topology of a two-level three-phase voltage source converter according to an embodiment of the present application;
fig. 7 is a topology structure diagram of a dc power transmission system according to an embodiment of the present application;
wherein the reference numbers are as follows:
1. a rectification module; 2. an SM module; 3. a second voltage source converter; 4. a direct current line; 5. a rectifier type converter; 6. a first voltage source converter; 7. a first transformer; 8. a second transformer; 9 a third voltage source converter; 10. and a third transformer.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a current conversion device for solve current direct current transmission system and do not possess the contravariant function, can not realize the technical problem of new forms of energy power plant black start.
Black start: the method is characterized in that after the whole system is stopped due to faults, the system is completely powered off (isolated small power grids are not excluded to still maintain operation), is in a completely black state, does not depend on other network help, and drives a generator set without self-starting capability by starting the generator set with the self-starting capability in the system, so that the recovery range of the system is gradually expanded, and finally the recovery of the whole system is realized.
Referring to fig. 1 and fig. 2, a structure of a converter device according to an embodiment of the present application is schematically illustrated.
The embodiment of the present application provides a first embodiment of a commutation device, and the commutation device in this embodiment includes a rectification type converter 5, a first voltage source converter 6, and a second voltage source converter 3, where the rectification type converter 5 includes a two-phase uncontrolled rectification type converter and a two-phase controlled rectification type converter; the N1 SM modules 2 of the first voltage source converter 6 are sequentially connected in series to form a first phase branch for transmitting reverse energy; the N2 rectifier modules 1 of the rectifier type current converter are sequentially connected in series to form a second-phase branch circuit, and the N3 rectifier modules 1 of the rectifier type current converter 5 are sequentially connected in series to form a third-phase branch circuit for transmitting forward energy; the first end of the first phase branch, the first end of the second phase branch and the first end of the third phase branch are connected with the first end of the second voltage source converter 3, and the second end of the first phase branch, the second end of the second phase branch and the second end of the third phase branch are connected with the direct current circuit 4; the second terminal of the second voltage source converter 3 is connected to ground.
It can be understood that the first end of the first phase branch, the first end of the second phase branch and the first end of the third phase branch are connected to the first end of the second voltage source converter 3, the second end of the first phase branch, the second end of the second phase branch and the second end of the third phase branch are connected to the dc line 4, that is, the rectification type converter 5 is connected in parallel with the first voltage source converter 6 and then connected in series with the second voltage source converter 3, the rectification type converter 5 includes a two-phase uncontrolled rectification type converter or a two-phase phased rectification type converter, the low-cost and low-loss characteristics of the rectification type converter 5 are utilized to realize the forward transmission of all energy when the new energy power plant operates normally, and the fully-controlled type of the first voltage source converter 6 and the second voltage source converter 3 is utilized to realize the reverse transmission of a small amount of energy when the new energy power plant starts.
It should be noted that the two-phase uncontrolled rectifier type inverter and the two-phase phased rectifier type inverter are current source type inverters based on uncontrolled or semi-controlled devices, and specific topologies thereof may be two-phase diode rectifier type inverters and two-phase thyristor rectifier type inverters. The topology of the SM module 2 can be a half-bridge type or a full-bridge type, as shown in fig. 3 and 4, and can be set as required by those skilled in the art.
In the embodiment of the application, N2 rectifier modules 1 of the rectifier type current converter 5 are sequentially connected in series to form a second phase branch, N3 rectifier modules 1 are sequentially connected in series to form a third phase branch for transmitting forward energy, when a new energy power plant stably operates and starts to send active power, the rectifier type current converter 5 is used for realizing energy forward transmission, N1 SM modules 2 of the first voltage source current converter 6 are sequentially connected in series to form a first phase branch for transmitting reverse energy, when the new energy power plant needs to absorb the active power from a power grid during starting, the two-phase uncontrolled rectifier or the two-phase controlled rectifier is not conducted, the characteristic of energy reverse transmission is realized by using the first voltage source current converter 6 to provide the active power for the new energy power plant, so that the new energy power plant can be started in a black state, the first voltage source current converter 6 is connected in parallel with the rectifier type current converter 5 and then connected in series with the second voltage source current converter 3, the technical problems that an existing direct current power transmission system does not have an inversion function and cannot realize black start of a new energy power plant are solved.
The above is a first embodiment of a converter device provided in the present application, and the following is a second embodiment of a converter device provided in the present application, and refer to fig. 1 and fig. 2 specifically.
The embodiment of the present application provides a second embodiment of a commutation device, the commutation device in this embodiment includes a rectification type converter 5, a first voltage source converter 6, and a second voltage source converter 3, where the rectification type converter 5 includes a two-phase uncontrolled rectification type converter and a two-phase controlled rectification type converter; the N1 SM modules 2 of the first voltage source converter 6 are sequentially connected in series to form a first phase branch for transmitting reverse energy; the N2 rectifier modules 1 of the rectifier type current converter 5 are sequentially connected in series to form a second-phase branch circuit, and the N3 rectifier modules 1 of the rectifier type current converter 5 are sequentially connected in series to form a third-phase branch circuit for transmitting forward energy; the first end of the first phase branch, the first end of the second phase branch and the first end of the third phase branch are connected with the first end of the second voltage source converter 3, and the second end of the first phase branch, the second end of the second phase branch and the second end of the third phase branch are connected with the direct current circuit 4; the second terminal of the second voltage source converter 3 is connected to ground.
Further, as shown in fig. 5 and 6, the second voltage source converter 3 provided in the present embodiment is a three-phase MMC type voltage source converter.
It can be understood that the three-phase MMC voltage source converter operates in a mode of an alternating current (VF) power source, can stabilize an alternating voltage and a direct current, and supply a harmonic current to the rectifier type converter 5 to offset the harmonic current generated when the rectifier type converter 5 operates, thereby improving the efficiency of production, transmission and utilization of electric energy.
It should be noted that the three-phase MMC voltage source type converter is a voltage source type converter based on a fully-controlled switching device, and the specific topology of the three-phase MMC voltage source type converter may be a two-level three-phase voltage source converter, a clamp type multilevel voltage source converter, a cascade type multilevel converter, a modular multilevel voltage source converter, or a multi-pulse voltage source converter.
Further, the number of the first voltage source converters 6 in the embodiment of the present application may be plural, and the plural first voltage source converters 6 are connected in series in sequence.
It should be noted that the number of the first voltage source converters 6 may be one, two, or three, and those skilled in the art may set the number according to actual needs.
Further, the number of the second voltage source converters 3 in the embodiment of the present application may be plural, and the plural first voltage source converters 6 are connected in series in sequence.
It should be noted that the number of the second voltage source converters 3 may be one, two, or three, and those skilled in the art may set the number according to actual needs.
In the embodiment of the application, N2 rectifier modules 1 of the rectifier type current converter 5 are sequentially connected in series to form a second phase branch, N3 rectifier modules 1 are sequentially connected in series to form a third phase branch for transmitting forward energy, when a new energy power plant stably operates and starts to send active power, the rectifier type current converter 5 is used for realizing energy forward transmission, N1 SM modules 2 of the first voltage source current converter 6 are sequentially connected in series to form a first phase branch for transmitting reverse energy, when the new energy power plant needs to absorb the active power from a power grid during starting, the two-phase uncontrolled rectifier or the two-phase controlled rectifier is not conducted, the characteristic of energy reverse transmission is realized by using the first voltage source current converter 6 to provide the active power for the new energy power plant, so that the new energy power plant can be started in a black state, the first voltage source current converter 6 is connected in parallel with the rectifier type current converter 5 and then connected in series with the second voltage source current converter 3, compared with the existing flexible direct-current power transmission system completely based on the voltage source converter, the scheme uses the uncontrolled or phase-controlled rectifier to bear most of direct-current voltage and power transmission, and reduces the number of fully-controlled devices and modules, thereby reducing the occupied area and the manufacturing cost of the transmitting end converter device, and reducing the loss. Compared with the conventional direct-current power transmission system completely based on the phase-controlled rectifier or the hybrid direct-current power transmission system completely based on the uncontrolled rectifier, the scheme does not need an additional alternating-current filter, a static reactive compensator or an active filter, and reduces the floor area of the converter station; the novel direct current power transmission system has the advantages that an additional alternating current power supply is not needed, the alternating current power supply required by the operation of the new energy power plant can be built, the reverse power can be provided when the new energy power plant is started, and the technical problems that an existing direct current power transmission system does not have an inversion function and cannot achieve the black start of the new energy power plant are solved.
The above is a second embodiment of a converter device provided in the present application, and the following is an embodiment of a dc power transmission system provided in the present application, and please refer to fig. 7 specifically.
The direct current transmission system in this embodiment includes a transmitting end converter device and a receiving end converter device, where the transmitting end converter device is connected to the receiving end converter device through a direct current line 4, and the transmitting end converter device includes the converter device described in the first embodiment or the second embodiment.
Further, the sending-end converter device in this embodiment further includes a first transformer 7 and a second transformer 8, a first end of the first transformer 7 is connected to a third end of the first-phase branch, a third end of the second-phase branch and a third end of the third-phase branch, and a second end is connected to the new energy power generation equipment; the first end of the second transformer 8 is connected with the third end of the second voltage source converter 3, and the second end is connected with the new energy power generation equipment.
Further, the number of the first transformers 7 in the present embodiment is two.
It should be noted that the first transformer 7 can play a role of reducing harmonics very well, and the number of the first transformers 7 may also be one, and those skilled in the art can set the number according to actual needs.
Further, the receiving end converter device in this embodiment includes a third voltage source converter 9 and a third transformer 10; a first end of the third voltage source converter 9 is connected with a first end of a third transformer 10, a second end is connected with the direct current line 4, and a third end is grounded; the second end of the third transformer 10 is connected to the grid.
Further, the third voltage source converter 9 in this embodiment comprises a three-phase MMC type voltage source converter.
It should be noted that the three-phase MMC voltage source converter operates in a constant voltage mode to stabilize the dc voltage of the dc system. The three-phase MMC type voltage source converter is a voltage source converter based on a fully-controlled switch device, and the specific topology of the three-phase MMC type voltage source converter can be a three-phase two-level type converter, a clamping type multi-level voltage source converter, a cascading type multi-level converter, a modular multi-level voltage source converter or a multi-pulse voltage source converter.
Further, the direct current transmission line in this embodiment includes a first smoothing reactor, a resistor, and a second smoothing reactor; the first end of the first smoothing reactor is connected with the sending end converter device, and the second end of the first smoothing reactor is connected with the first end of the resistor; the second end of the resistor is connected with the first end of the second smoothing reactor; and the second end of the second smoothing reactor is connected with a receiving end converter device.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A current conversion device is characterized by comprising a rectification type current converter, a first voltage source current converter and a second voltage source current converter, wherein the rectification type current converter comprises a two-phase uncontrolled rectification type current converter or a two-phase controlled rectification type current converter;
the N1 SM modules of the first voltage source converter are sequentially connected in series to form a first phase branch for transmitting reverse energy;
the N2 rectifying modules of the rectifying type current converter are sequentially connected in series to form a second-phase branch circuit, and the N3 rectifying modules of the rectifying type current converter are sequentially connected in series to form a third-phase branch circuit for transmitting forward energy;
the first end of the first phase branch, the first end of the second phase branch and the first end of the third phase branch are connected with the first end of the second voltage source converter, and the second end of the first phase branch, the second end of the second phase branch and the second end of the third phase branch are connected with a direct current line;
a second terminal of the second voltage source converter is connected to ground.
2. A converter arrangement according to claim 1, characterized in that said second voltage source converter is a three-phase MMC type voltage source converter.
3. The converter arrangement according to claim 1, characterized in that the number of said first voltage source converters is plural;
a plurality of said first voltage source converters are connected in series in sequence.
4. The converter arrangement according to claim 1, characterized in that said second voltage source converter is plural in number;
a plurality of said second voltage source converters are connected in series in sequence.
5. A dc transmission system, comprising a transmitting end converter device and a receiving end converter device, wherein the transmitting end converter device is connected to the receiving end converter device through a dc line, and the transmitting end converter device is the converter device according to any one of claims 1 to 4.
6. The direct current transmission system according to claim 5, wherein said transmitting-side converter device further comprises a first transformer and a second transformer;
the first end of the first transformer is connected with the third end of the first phase branch, the third end of the second phase branch and the third end of the third phase branch, and the second end of the first transformer is connected with new energy power generation equipment;
and the first end of the second transformer is connected with the third end of the second voltage source converter, and the second end of the second transformer is connected with the new energy power generation equipment.
7. The direct current transmission system according to claim 6, characterized in that the number of said first transformers is two.
8. A direct current transmission system according to claim 5, characterized in that said current receiving end converter means comprises a third voltage source converter and a third transformer;
the first end of the third voltage source converter is connected with the first end of the third transformer, the second end of the third voltage source converter is connected with the direct current line, and the third end of the third voltage source converter is grounded;
and the second end of the third transformer is connected with a power grid.
9. A direct current transmission system according to claim 8, characterized in that the third voltage source converter comprises a three-phase MMC type voltage source converter.
10. The direct current transmission system according to claim 5, characterized in that the direct current line includes a first smoothing reactor, a resistor, and a second smoothing reactor;
the first end of the first smoothing reactor is connected with the sending end converter device, and the second end of the first smoothing reactor is connected with the first end of the resistor;
the second end of the resistor is connected with the first end of the second smoothing reactor;
and the second end of the second smoothing reactor is connected with the receiving end converter device.
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| CN103337972B (en) * | 2013-05-22 | 2014-06-18 | 华中科技大学 | Mixed type transverter and wind power generation system |
| CN105162155B (en) * | 2015-08-26 | 2017-10-27 | 浙江大学 | A kind of series hybrid bipolar direct current transmission system with DC Line Fault ride-through capability |
| CN108321828B (en) * | 2017-01-18 | 2022-01-11 | 华北电力大学 | Current source-mixed voltage source series type current converter topology |
| CN107359638B (en) * | 2017-04-10 | 2020-12-11 | 华北电力大学 | Multi-port direct current-direct current voltage transformation system topology with stepless regulation of direct current voltage |
| CN109586328B (en) * | 2018-11-20 | 2022-05-31 | 国网重庆市电力公司电力科学研究院 | Economical single-end cascade hybrid direct-current power transmission system with bidirectional flowing power flow |
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2020
- 2020-07-14 CN CN202010674252.8A patent/CN111800027B/en active Active
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