CN218102606U - Power transmission system - Google Patents
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- CN218102606U CN218102606U CN202221959701.4U CN202221959701U CN218102606U CN 218102606 U CN218102606 U CN 218102606U CN 202221959701 U CN202221959701 U CN 202221959701U CN 218102606 U CN218102606 U CN 218102606U
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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 transmission system belongs to the technical field of electricity generation. The system comprises: the power generation device comprises N power generation unit arrays, a power generation unit and a control unit, wherein each power generation unit array is used for outputting direct-current voltage, and N is an integer greater than 1; the direct current boost converter is provided with N input ends, the N input ends are correspondingly and electrically connected with the N power generation unit arrays, the input ends of different direct current boost converters correspond to different power generation unit arrays, and the direct current boost converter is used for converging and boosting direct current voltages output by the N power generation unit arrays and outputting boosted direct current voltages; the input end of the modular multilevel converter is electrically connected with the output end of the direct current boost converter, the output end of the modular multilevel converter is connected with a power grid, and the modular multilevel converter is used for converting the output direct current voltage into alternating current voltage and inputting the alternating current voltage into the power grid.
Description
Technical Field
The application relates to the technical field of power generation, in particular to a power transmission system.
Background
With the development of power generation technology and the improvement of environmental protection awareness, renewable energy power generation equipment is applied more and more widely, and renewable energy such as light energy or wind energy can be converted into electric energy required by people. In order to transmit electric energy generated by renewable energy to a power grid, direct current electric energy generated by renewable energy power generation equipment is generally converted into alternating current electric energy through a photovoltaic inverter, then the electric energy is collected and boosted, and then the electric energy is transmitted to the power grid through an alternating current transmission line.
However, since the electric energy output by the renewable energy power generation device is low-voltage direct current electric energy, in order to reach the high-voltage alternating current transmission level, inversion and multiple boosting links are required, the electric energy conversion efficiency is low, the transmission efficiency of the electric energy is reduced, and the utilization efficiency of renewable energy is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application aims to provide a power transmission system which can improve the utilization efficiency of renewable energy.
The embodiment of the application provides a power transmission system. The method comprises the following steps:
the power generation device comprises N power generation unit arrays, a power generation unit and a power generation unit, wherein each power generation unit array is used for outputting direct-current voltage, and N is an integer greater than 1;
the direct current boost converter is provided with N input ends, the N input ends are correspondingly and electrically connected with the N power generation unit arrays, the input ends of different direct current boost converters correspond to different power generation unit arrays, and the direct current boost converter is used for converging and boosting direct current voltages output by the N power generation unit arrays and outputting boosted direct current voltages;
the input end of the modularized multi-level converter is electrically connected with the output end of the direct current boost converter, the output end of the modularized multi-level converter is connected with a power grid, and the modularized multi-level converter is used for converting output direct current voltage into alternating current voltage and inputting the alternating current voltage into the power grid.
In the embodiment of the application, N power generation unit arrays of a power transmission system are connected in parallel with N input ends of a direct current boost converter, direct current voltages output by the N power generation unit arrays are converged and boosted by the direct current boost converter, and the boosted direct current voltages are output; the output end of the DC boost converter is electrically connected with the input end of the modular multilevel converter, the output end of the modular multilevel converter is connected with a power grid, and the output DC voltage is converted into AC voltage through the modular multilevel converter and is input into the power grid. So, can realize the DC voltage of N power generation unit array output through direct current boost converter and converge and step up for output voltage's grade can improve the grade that is fit for remote transmission, can convert the direct current after will improving by the many level transverter of modularization into the alternating current that is fit for keeping away from the transmission again, thereby can reduce the number of times that you become and step up among the transmission of electricity process, promote the transmission efficiency of electric energy, and then promote renewable energy's utilization efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a power transmission system provided herein;
FIG. 2 is a schematic diagram of a DC converter in an embodiment of a power transmission system provided herein;
FIG. 3 is a schematic diagram of a DC boost converter in an embodiment of a power transmission system provided herein;
fig. 4 is a schematic diagram of another dc boost converter in an embodiment of a power transmission system as provided herein.
Detailed Description
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 some, but not all, embodiments of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.
The power transmission system provided by the embodiment of the present application is described in detail with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Fig. 1 is a schematic structural diagram of a power transmission system according to an embodiment of the present application. As shown in fig. 1, the power transmission system includes:
n power generation cell arrays 10, each power generation cell array 10 being configured to output a dc voltage, where N is an integer greater than 1;
the direct current boost converter 20 is provided with N input ends, the N input ends are correspondingly and electrically connected with the N power generation unit arrays 10, the input ends of different direct current boost converters 20 correspond to different power generation unit arrays 10, and the direct current boost converter 20 is used for converging and boosting direct current voltages output by the N power generation unit arrays 10 and outputting the boosted direct current voltage;
an input end of the modular multilevel converter 30 is electrically connected with an output end of the dc boost converter 20, an output end of the modular multilevel converter 30 is connected with a power grid, and the modular multilevel converter 30 is used for converting an output dc voltage into an ac voltage and inputting the ac voltage into the power grid.
Based on this, the N power generation cell arrays 10 of the power transmission system are connected in parallel with the N input terminals of the dc boost converter 20, and the dc voltages output from the N power generation cell arrays 10 are converged and boosted by the dc boost converter 20, and the boosted dc voltage is output; the output terminal of the dc boost converter 20 is electrically connected to the input terminal of the modular multilevel converter 30, and the output terminal of the modular multilevel converter 30 is connected to the power grid, so that the output dc voltage is converted into an ac voltage by the modular multilevel converter 30 and is input to the power grid. Thus, the dc boost converter 20 can converge and boost the dc voltages output by the N power generation cell arrays 10, so that the level of the output voltage can be increased to a level suitable for remote transmission, and the increased dc voltage can be converted into ac suitable for remote transmission by the modular multilevel converter 30, thereby reducing the frequency of power transmission and boosting, improving the transmission efficiency of electric energy, and further improving the utilization efficiency of renewable energy.
In the embodiment of the present application, the power transmission system includes N power generation cell arrays 10.
The power generation cell array 10 may be any device that can convert renewable energy into dc voltage and output the dc voltage.
For example, the power generating unit array 10 may be a wind turbine generator system, which may convert wind energy into a direct current voltage and output the direct current voltage, or the like.
In some embodiments, the power generation unit array 10 is a photovoltaic power generation array, so that transmission efficiency in a photovoltaic power generation process can be improved, and utilization efficiency of solar energy can be improved.
The power generation cell array 10 may be configured by a plurality of power generation cells 11 that can convert renewable energy into dc voltage and output the dc voltage, and the plurality of wind power generation cells 11 may be connected in parallel to each other.
For example, in the case where the above-described power generation cell array 10 is a photovoltaic power generation cell array 10, the photovoltaic power generation cell array 10 may include a plurality of photovoltaic power generation cells 11, and the plurality of photovoltaic power generation cells 11 are connected in parallel, or the like.
In some embodiments, as shown in fig. 2, the power generation cell array 10 includes:
m power generation units 11 are connected in series, the positive electrode of the output end of the first power generation unit 11 is electrically connected with the positive electrode of the input end of the corresponding direct current boost converter 20, the negative electrode of the output end of the Mth power generation unit 11 is electrically connected with the negative electrode of the input end of the direct current boost converter 20, and M is an integer greater than 1.
Based on this, by connecting M power generation units 11 in series, the electric energy converted by the M power generation units 11 can be collected, so that the voltage level of the dc voltage output by each power generation unit array 10 is increased, and thus the dc point output by the power generation unit array 10 is more suitable for long-distance transmission, thereby further improving the power transmission efficiency.
For example, in the case where each of the power generating cell arrays 10 is a photovoltaic power generating cell array 10, the photovoltaic power generating cell array 10 may include M photovoltaic power generating cells 11, in the M photovoltaic power generating cells 11, an output end positive electrode of a first photovoltaic power generating cell 11 is electrically connected to an input end positive electrode of the corresponding dc boost converter 20, an output end negative electrode of an mth photovoltaic power generating cell 11 is electrically connected to an input end negative electrode of the corresponding dc boost converter 20, and an output end positive electrode of an i-th (i is an integer greater than 1 and less than M) photovoltaic power generating cell 11 is electrically connected to an output end negative electrode of an i-1-th photovoltaic power generating cell 11, so that the M photovoltaic power generating cells 11 are connected in series, thereby converging electric energy of the M photovoltaic power generating cells 11 and increasing a voltage level output by the entire columns of the power generating cells 11.
The power generation unit 11 may have any structure capable of converting renewable energy into direct current and outputting the direct current.
In some embodiments, the power generation unit 11 includes:
an electric energy conversion assembly 111;
a DC converter 112, the DC converter 112 is electrically connected with the electric energy conversion component 111,
the positive electrode of the output end of the dc converter 112 of the first power generation unit 11 is electrically connected to the positive electrode of the input end of the corresponding dc boost converter 20, and the negative electrode of the output end of the dc converter 112 of the mth power generation unit 11 is electrically connected to the negative electrode of the input end of the dc boost converter 20.
Based on this, the renewable energy can be converted into electric energy by the electric energy conversion assembly 111, and then the electric energy converted by the electric energy conversion assembly 111 is converted into direct current by the direct current converter 112, thereby realizing conversion of the renewable energy into direct current.
The electric energy conversion module 111 may be a module that converts renewable energy into electric energy. For example, in the case where the power generation unit 11 is a photovoltaic power generation unit 11, the power conversion module 111 may include a photovoltaic panel or the like.
The dc converter 112 may be a device capable of converting the dc power with relatively low power converted by the power conversion module 111 into dc power with required power.
In some embodiments, as shown in fig. 2, the dc converter 112 includes:
the power conversion module 111 is connected in parallel to the power modules 1121, in the power modules 1121, an output end positive electrode of a first power module 1121 is an output end positive electrode of the dc converter 112, an output end negative electrode of a last power module 1121 is an output end negative electrode of the dc converter 112, the output end positive electrode of a kth power module 1121 is electrically connected to an output end negative electrode of a K-1 th power module 1121, and K is an integer greater than 1.
Based on this, the plurality of power modules 1121 are connected in parallel to the electric energy conversion module 111, and the plurality of power modules 1121 are connected in series to each other, so that the capability of the dc converter 112 to adjust the power of the output dc power can be improved.
Of course, the dc converter 112 may be configured by only the one power module 1121, and is not limited thereto.
Each of the power modules 1121 may be a component for increasing the power of the dc power output from the electric energy conversion module 111 connected thereto.
For example, each of the power modules 1121 may include a dc boost circuit, and the dc boost circuit may directly boost the input dc power and output the boosted dc power, and the dc boost circuit may be formed by connecting components such as a capacitor, an inductor, a resistor, a diode 201, and a transistor.
In some embodiments, the power module 1121 includes:
a dc-to-ac converter 11211, wherein an input terminal anode of the dc-to-ac converter 11211 is an input terminal anode of the power module 1121, and an input terminal cathode of the dc-to-ac converter 11211 is an input terminal cathode of the power module 1121;
a first transformer 11212, the first transformer 11212 being electrically connected to the dc-to-ac converter 11211;
an ac-to-dc converter 11213, an output positive terminal of the ac-to-dc converter 11213 is an output positive terminal of the power module 1121, and an output negative terminal of the ac-to-dc converter 11213 is an output negative terminal of the power module 1121.
Based on this, each power module 1121 includes a dc-to-ac converter 11211, a first transformer 11212 and an ac-to-dc converter 11213, and may convert the dc power output by the power conversion module 111 into an ac point, and then boost the ac point, and finally convert the boosted ac power into dc power for input, so as to reduce the power loss caused by the power module 1121 in the process of converting the power energy, and further improve the utilization rate of renewable resources.
The power generation unit 11 may be composed of only the electric energy conversion module 111 and the dc converter 112.
In some embodiments, the power generation unit 11 further includes:
the bidirectional direct current converter 113, the bidirectional direct current converter 113 and the direct current converter 112 are connected in parallel to the electric energy conversion component 111;
and the energy storage unit 114, wherein the energy storage unit 114 is electrically connected with the bidirectional direct current converter 113.
Based on this, the bidirectional dc converter 113 and the dc converter 112 are connected in parallel to the electric energy conversion assembly 111, and the energy storage unit 114 is electrically connected to the bidirectional dc converter 113, so that the bidirectional dc converter 113 and the energy storage unit 114 connected in series are connected between the electric energy conversion assembly 111 and the dc converter 112, and thus when the electric quantity output by the electric energy conversion assembly 111 is large, the redundant electric energy is stored in the energy storage unit 114, and when the electric quantity output by the electric energy conversion assembly 111 is small, the electric energy stored in the energy storage unit 114 is released, so that the power output by the power generation unit 11 is more stable and smooth.
In this embodiment, the power transmission system further includes a dc boost converter 20, where the dc boost converter 20 is provided with N input terminals, and the N input terminals are electrically connected to the N power generation unit arrays 10 in a one-to-one correspondence manner.
The N input terminals are electrically connected to the N power generation cell arrays 10 in a one-to-one correspondence manner, and the output terminal of each power generation cell array 10 may be electrically connected to the corresponding input terminal, and the output terminals of different power generation cell arrays 10 are electrically connected to different input terminals.
It should be noted that each of the N input terminals may include an input terminal positive electrode and an input terminal negative electrode, the input terminal positive electrode is electrically connected to the output terminal positive electrode of the corresponding power generation cell array 10, and the input terminal negative electrode is electrically connected to the output terminal negative electrode of the corresponding power generation cell array 10.
In addition, the dc boost converter 20 may further include a ground terminal, and the ground terminals of the N power generation cell arrays 10 may be connected to the ground terminal of the dc boost converter 20.
The dc boost converter 20 may be any device capable of merging and boosting dc voltages output from the N power generation cell arrays 10.
In some embodiments, as shown in fig. 3, the dc boost converter 20 includes:
the N first bridge arms 21 are arranged corresponding to the N power generation unit arrays 10, and the first end of each first bridge arm 21 is electrically connected with the corresponding power generation unit array 10;
a second bridge arm 22, wherein a first end of the second bridge arm 22 is electrically connected to second ends of the N first bridge arms 21, and a second end of the second bridge arm 22 is electrically connected to the modular multilevel converter 30;
and a first end of the third bridge arm 23 and a first end of the second bridge arm 22 are connected in parallel to second ends of the N first bridge arms 21, and second ends of the third bridge arm 23 are grounded.
Accordingly, the dc voltages output from the N power generation cell arrays 10 can be converged and boosted by the fitting connection of the N first arms 21, the second arms 22, and the third arms 23.
The first bridge arm 21, the second bridge arm 22 and the third bridge arm 23 may each have a structure including at least one bridge arm module SM, and the bridge arm module SM may be a full bridge sub-module or a half bridge sub-module.
In some embodiments, at least one of first leg 21, second leg 22, and third leg 23 includes three first phase cells, each first phase cell including at least one leg module SM and a leg reactor L electrically connected to the at least one leg module SM.
The input end of the first bridge arm module SM in the three first-phase units can be connected in parallel to form the first end of the corresponding bridge arm, and the output ends of the bridge arm reactors L in the three first-phase units are connected in parallel to form the second end of the corresponding bridge arm.
Based on this, at least one of first leg 21, second leg 22, and third leg 23 includes three-phase first cells, and each first-phase cell includes at least one leg module SM and leg reactor L, so that the performance of dc boost converter 20 can be improved.
At least one of the first bridge arm 21, the second bridge arm 22, and the third bridge arm 23 includes three first-phase units, and the first bridge arm 21, the second bridge arm 22, and the third bridge arm 23 may include three first-phase units, so that performance of the dc boost converter 20 is further improved.
In addition, when each of the input terminals includes an input terminal positive electrode and an input terminal negative electrode, the dc boost converter 20 may include two groups of N first bridge arms 21, second bridge arms 22 and third bridge arms 23, and each group of N first bridge arms 21, second bridge arms 22 and third bridge arms 23 is connected between the input terminal negative electrode or the input terminal negative electrode and the input terminal of the modular multilevel converter 30.
When the dc boost converter 20 is formed by the N first arm 21, the second arm 22, and the third arm 23, which are connected in a mating manner, the output voltage between the output terminal and the ground of the dc boost converter 20 is U dcH The DC voltage component of the second leg 22 is U H The DC voltage component of the third arm 23 is U W N first bridge armsThe dc voltage component of the first arm 21Li (i =1,2 \8230N; N) in 21 is U Li (i =1,2 \ 8230; N). Suppose the input voltage at the input of the dc boost converter 20 is U dcLi (i =1,2 \ 8230n), then the amount of dc voltage satisfies: u shape dcH ＝U H +U W ；U W ＝U Li +U dcLi (ii) a The voltage of the first bridge arm 21Li can be changed by adjusting the number of the bridge arm modules SM in the first bridge arm 21Li, so that the input port of the dc boost converter 20 can be connected to the power generation cell arrays 10 with different voltage levels.
In some embodiments, as shown in fig. 4, the dc boost converter 20 includes N phase circuits 21, the N phase circuits 21 are disposed corresponding to the N power generation cell arrays 10, and each phase circuit 21 includes:
a first bi-directional power switch 211, a first end of the first bi-directional power switch 211 being electrically connected to the corresponding power generation cell array 10;
a second bi-directional power switch 212, a first terminal of the second bi-directional power switch 212 being electrically connected to a second terminal of the first bi-directional power switch 211, a second terminal of the second bi-directional power switch 212 being electrically connected to the modular multilevel converter 30;
a first end of the second phase unit 213 is connected to the second end of the first bidirectional power switch 211 and the first end of the second bidirectional power switch 212, and a second end of the second phase unit 213 is grounded.
In this way, the dc boost converter 20 is configured by the N phase circuits 21, and the configuration of the dc boost converter 20 is more flexible.
The first and second bidirectional power switches 211 and 212 may be any switches bi-directional to current and voltage, and may be formed of at least one of a diode 201 and a thyristor 202, etc.
In some embodiments, at least one of the first bidirectional power switch 211 and the second bidirectional power switch 212 comprises:
the diodes 201 are connected in series, the anode of the first diode 201 is the first end of the bidirectional power switch, and the cathode of the last diode 201 is the second end of the bidirectional power switch;
the thyristors 202 are arranged corresponding to the diodes 201, and each thyristor 202 is connected in parallel with the corresponding diode 201 in the reverse direction.
Based on this, the bidirectional power switch (i.e., at least one of the first bidirectional power switch 211 and the second bidirectional power switch 212) is formed by connecting the plurality of diodes 201 and the plurality of thyristors 202, so that the structure of the bidirectional power switch is simple and the stability is high.
It should be noted that, in the case that each of the input terminals includes an input terminal positive pole and an input terminal negative pole, the dc boost converter 20 may include two sets of N phase circuits 21, and each set of N phase circuits 21 is connected between the input terminal negative pole or the input terminal negative pole and the input terminal of the modular multilevel converter 30.
When the dc boost converter 20 is formed by the N-phase circuits 21, the output voltage between the output terminal of the dc boost converter 20 and the ground is U H The input voltage between the input terminal and the ground terminal is U Li (i =1,2 \8230N) and the bridge arm voltage is U SMi (i =1,2 \ 8230; N). By regulating bridge arm voltage at U H And U Li (i =1,2 \8230N; N) can realize the transmission of energy in the converter when U Li (i =1,2 \8230; N) is greater than U SMi (i =1,2 \8230N) the input terminal charges the bridge arm, when U is turned on SMi (i =1,2 \8230; N) is greater than U Li (i =1,2 \8230N), the bridge arm discharges to the output terminal. Thus, by adjusting the bridge arm voltage U SMi (i =1,2 \8230n); N), the power generation cell array 10 having different voltage levels connected to the input terminal of the dc boost converter 20 can be realized.
In the embodiment of the present application, the power transmission system further includes a modular multilevel converter 30, where the modular multilevel converter 30 can convert the dc voltage output by the dc boost converter 20 into an ac voltage and input the ac voltage to the power grid.
In some embodiments, the power transmission system further includes: and a second transformer 40, wherein the second transformer 40 is electrically connected between the modular multilevel converter 30 and the power grid, so that the ac voltage converted by the modular multilevel converter 30 can be boosted to a voltage level that can be connected to the power grid through the second transformer 40.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (11)
1. A power transmission system, comprising:
the power generation device comprises N power generation unit arrays, a power generation unit and a control unit, wherein each power generation unit array is used for outputting direct-current voltage, and N is an integer greater than 1;
the direct current boost converter is provided with N input ends, the N input ends are correspondingly and electrically connected with the N power generation unit arrays, the input ends of different direct current boost converters correspond to different power generation unit arrays, and the direct current boost converter is used for converging and boosting direct current voltages output by the N power generation unit arrays and outputting boosted direct current voltages;
the input end of the modular multilevel converter is electrically connected with the output end of the direct current boost converter, the output end of the modular multilevel converter is connected with a power grid, and the modular multilevel converter is used for converting the output direct current voltage into alternating current voltage and inputting the alternating current voltage into the power grid.
2. The power transmission system of claim 1, wherein the dc boost converter comprises:
the N first bridge arms are arranged corresponding to the N power generation unit arrays, and the first end of each first bridge arm is electrically connected with the corresponding power generation unit array;
a second bridge arm, a first end of the second bridge arm being electrically connected to second ends of the N first bridge arms, a second end of the second bridge arm being electrically connected to the modular multilevel converter;
and the first end of the third bridge arm and the first end of the second bridge arm are connected in parallel to the second ends of the N first bridge arms, and the second end of the third bridge arm is grounded.
3. The power transmission system of claim 2, wherein at least one of the first leg, the second leg, and the third leg comprises three first phase units, each of the first phase units comprising at least one leg module and a leg reactor electrically connected to the at least one leg module,
the input end of a first bridge arm module in the three first-phase units is connected in parallel to form a first end of a corresponding bridge arm, and the output ends of the bridge arm reactors of the three first-phase units are connected in parallel to form a second end of the corresponding bridge arm.
4. The power transmission system of claim 1, wherein the dc boost converter includes N phase circuits, the N phase circuits being arranged in correspondence with the N arrays of power generation cells, each phase circuit including:
the first end of the first bidirectional power switch is electrically connected with the corresponding power generation unit array;
a second bidirectional power switch having a first end electrically connected to the second end of the first bidirectional power switch, the second end of the second bidirectional power switch electrically connected to the modular multilevel converter;
and a first end of the second phase unit is connected to the second end of the first bidirectional power switch and the first end of the second bidirectional power switch, and a second end of the second phase unit is grounded.
5. The power transmission system of claim 4, wherein at least one of the first bidirectional power switch and the second bidirectional power switch comprises:
the diodes are connected in series, the anode of the first diode is the first end of the bidirectional power switch, and the cathode of the last diode is the second end of the bidirectional power switch;
and the thyristors are arranged corresponding to the diodes, and each thyristor is connected with the corresponding diode in parallel and in reverse direction.
6. The power transmission system of claim 1, wherein the array of power generation cells comprises:
the power generation system comprises M power generation units, wherein the M power generation units are connected in series, the positive electrode of the output end of the first power generation unit is electrically connected with the positive electrode of the input end of the corresponding direct current boost converter, the negative electrode of the output end of the Mth power generation unit is electrically connected with the negative electrode of the input end of the direct current boost converter, and M is an integer larger than 1.
7. The power transmission system of claim 6, wherein the power generation unit comprises:
an electrical energy conversion assembly;
a DC converter electrically connected to the electrical energy conversion assembly,
the positive electrode of the output end of the direct current converter of the first power generation unit is electrically connected with the positive electrode of the input end of the corresponding direct current boost converter, and the negative electrode of the output end of the direct current converter of the Mth power generation unit is electrically connected with the negative electrode of the input end of the direct current boost converter.
8. The power transmission system of claim 7, wherein the power generation unit further comprises:
the bidirectional direct current converter and the direct current converter are connected into the electric energy conversion assembly in parallel;
and the energy storage unit is electrically connected with the bidirectional direct current converter.
9. The power transmission system of claim 7, wherein the dc converter comprises:
the power module and the electric energy conversion assembly are connected in parallel, in the power modules, the positive electrode of the output end of the first power module is the positive electrode of the output end of the direct current converter, the negative electrode of the output end of the last power module is the negative electrode of the output end of the direct current converter, the positive electrode of the output end of the Kth power module is electrically connected with the negative electrode of the output end of the Kth power module, and K is an integer larger than 1.
10. The power transmission system of claim 9, wherein the power module comprises:
the input end anode of the DC-to-AC converter is the input end anode of the power module, and the input end cathode of the DC-to-AC converter is the input end cathode of the power module;
the first transformer is electrically connected with the direct current-to-alternating current converter;
and the positive electrode of the output end of the AC-DC converter is the positive electrode of the output end of the power module, and the negative electrode of the output end of the AC-DC converter is the negative electrode of the output end of the power module.
11. The power transmission system of claim 1, further comprising:
a second transformer electrically connected between the modular multilevel converter and the grid; alternatively, and in addition,
the power generation unit array is a photovoltaic power generation array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202221959701.4U CN218102606U (en) | 2022-07-27 | 2022-07-27 | Power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221959701.4U CN218102606U (en) | 2022-07-27 | 2022-07-27 | Power transmission system |
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| CN218102606U true CN218102606U (en) | 2022-12-20 |
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