CN217115940U - Multi-level topology distributed conversion device based on modularization - Google Patents
Multi-level topology distributed conversion device based on modularization Download PDFInfo
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- CN217115940U CN217115940U CN202220417936.4U CN202220417936U CN217115940U CN 217115940 U CN217115940 U CN 217115940U CN 202220417936 U CN202220417936 U CN 202220417936U CN 217115940 U CN217115940 U CN 217115940U
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Abstract
The utility model discloses a many level topology distributing type conversion equipment based on modularization, including a plurality of converter valve bridge arm units, converter valve bridge arm unit is cascaded by a plurality of converter valve bridge arm submodule pieces and is formed; the converter valve bridge arm unit is connected with at least one external device in a plug-in manner. The device provided by the utility model has adjustable integral capacity and voltage grade and high integration level, greatly saves the using amount of an auxiliary system, can realize the mixed cascade of various new energy devices, novel loads, electric vehicles and energy storage elements, can be directly merged into medium-voltage, high-voltage alternating and direct current power grids, and realizes the conversion of electric energy and the friendly management of the devices; meanwhile, by adopting a modular plug-in design, the device can be directly pulled out for detection and replacement when a fault occurs, so that the flexibility and the reliability of the device are greatly improved, and the maintenance workload and the maintenance cost of the device station are reduced.
Description
Technical Field
The utility model relates to the field of electronic technology, concretely relates to many level topology distributing type conversion equipment based on modularization.
Background
With the development of scientific technology, new loads (e.g., electric vehicles, data centers, etc.) and distributed energy resources are increasing, and most of the new loads interact with a power grid through power electronic equipment. For a large number of distributed power supplies and loads with different characteristics, operators need to be equipped with independent grid-connected equipment and perform targeted maintenance and management, so that the operation and construction cost is increased, the problem of electric energy quality caused by a large number of low-voltage small-scale converters is increasingly highlighted, and adverse effects are brought to the construction and operation of a novel electric power system.
Taking a photovoltaic access grid-connected system as an example, in the case of large new energy stations with larger and larger scales, for example, centralized or group-string large photovoltaic power stations, there are many low-voltage parallel converters in the stations, coordination control is difficult, and maintenance amount is large. And a multistage boosting link exists between a low-voltage collecting network and a high-voltage transmission network, the electrical distance between a current converter and a power grid is increased, powerful support is difficult to provide for the power grid, and the development of large-scale new energy grid-connected power generation is restrained.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in reducing operation, construction cost, improves electric energy quality and electric wire netting support ability to a multi-level topology distributing type conversion equipment based on modularization is provided.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the embodiment of the utility model provides a many level topology distributing type conversion equipment based on modularization, include: the converter valve bridge arm units are formed by cascading a plurality of converter valve bridge arm sub-modules; the converter valve bridge arm unit is connected with at least one external device in a plug-in manner.
Optionally, the converter valve bridge arm units are connected in parallel.
Optionally, the converter valve bridge arm units are connected in series.
Optionally, every two converter valve bridge arm units are connected in series to form a converter valve bridge arm, and the upper end and the lower end of the plurality of converter valve bridge arms are connected in cascade.
Optionally, the converter valve bridge arm submodule includes a pre-stage converter and a post-stage converter, wherein,
a first port of the preceding converter is connected with a first port of the subsequent converter in parallel, and a second port of the preceding converter is connected with a common bus or a second port of the preceding converter of other converter valve bridge arm submodules;
and the second port of the post converter is connected with an external device.
Optionally, the pre-converter is a half-bridge circuit or a full-bridge circuit.
Optionally, the post-converter is a back-to-back DC-DC converter.
Optionally, the pre-converter comprises: an energy storage element and a power electronic switch.
Optionally, the power electronic switch is a diode, or a MOSFET, or an IGBT or an IGCT.
Optionally, the energy storage element is a capacitor or a storage battery.
The utility model discloses technical scheme has following advantage:
the utility model provides a many level topology distributed conversion equipment based on modularization, including a plurality of converter valve bridge arm units, converter valve bridge arm unit is cascaded by a plurality of converter valve bridge arm submodule pieces and is formed; the converter valve bridge arm unit is connected with at least one external device in a plug-in manner. The device provided by the utility model has adjustable integral capacity and voltage grade and high integration level, greatly saves the using amount of an auxiliary system, can realize the mixed cascade of various new energy devices, novel loads, electric vehicles and energy storage elements, can be directly merged into medium-voltage, high-voltage alternating and direct current power grids, and realizes the conversion of electric energy and the friendly management of the devices; meanwhile, the device can be pulled out to be directly detected and replaced when a fault occurs by adopting a modular plug-in design, so that the flexibility and the reliability of the device are greatly improved, and the maintenance workload and the maintenance cost of the device station are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a specific example of a converter bridge arm unit of a modular multilevel topology-based distributed converter of the present invention;
fig. 2 is a schematic structural diagram of parallel connection between bridge arm units of the converter valve provided by the embodiment of the present invention;
fig. 3 is a schematic structural diagram of series connection between bridge arm units of a converter valve provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of three-phase output formed by mixing and cascading bridge arm units of the converter valve provided by the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a multiphase output formed by mixing and cascading bridge arm units of the converter valve provided by the embodiment of the present invention;
fig. 6 is a schematic diagram of a circuit structure of the converter valve bridge arm submodule capable of unidirectional power transmission provided in the embodiment of the present invention;
fig. 7 is a schematic circuit structure diagram of the converter valve bridge arm submodule capable of bidirectional power transmission provided in the embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, 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 of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. 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 present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a many level topology distributing type conversion equipment based on modularization can be applied to the occasion of extensive new forms of energy grid-connected electricity generation, and this many level topology distributing type conversion equipment based on modularization includes: a plurality of converter valve bridge arm units 2, as shown in fig. 1, each converter valve bridge arm unit 2 is formed by cascading a plurality of converter valve bridge arm sub-modules SM; the converter valve bridge arm unit 2 is connected with at least one external device 3 in a plug-in manner. Specifically, the number of the converter valve bridge arm units 2 can be flexibly designed to adapt to the scale of the power supply or the load. Each converter valve bridge arm unit 2 is formed by cascading a plurality of converter valve bridge arm submodules SM, forms corresponding modulation waveforms through a central controller interacting with a power grid, forms switch signals of each valve through voltage balance control, sends the switch signals into a valve control module, and realizes the conversion from a low-voltage port to medium/high-voltage alternating current and direct current energy through controlling the on and off of the submodule switch devices.
The utility model provides a many level topology distributed conversion equipment based on modularization, whole capacity, voltage level are adjustable and the integrated level is high, have saved the auxiliary system quantity greatly to can realize the mixed cascade of multiple new energy equipment, novel load, electric automobile and energy storage component, and can directly merge into medium voltage, high voltage and direct current electric wire netting, realize the conversion of electric energy and the friendly management of equipment; meanwhile, by adopting a modular plug-in design, the device can be directly pulled out for detection and replacement when a fault occurs, so that the flexibility and the reliability of the device are greatly improved, and the maintenance workload and the maintenance cost of the device station are reduced.
In a specific embodiment, as shown in fig. 2, a plurality of converter valve bridge arm units 2 are connected in parallel to form a modular-based multi-level topology distributed conversion apparatus according to an embodiment of the present invention.
In a specific embodiment, as shown in fig. 3, a plurality of converter valve bridge arm units 2 are connected in series to form a modular-based multi-level topology distributed converter device according to an embodiment of the present invention.
In a specific embodiment, as shown in fig. 4 to 5, each two converter valve bridge arm units 2 are connected in series to form one converter valve bridge arm, and the upper and lower ends of the plurality of converter valve bridge arms are connected in cascade to form the modular-based multi-level topology distributed conversion apparatus according to the embodiment of the present invention.
Specifically, the embodiment of the utility model provides a still can be by converter valve bridge arm unit 2 through the cluster, parallelly connected and series-parallel connection alone or mix the combination, constitute multinomial structure, satisfy the demand to its transverter device output under the different work condition. The practical application is not limited to the typical structure given in the figures, and the asymmetric structure can also realize the conversion function of the device. For a device formed by mixing and cascading a plurality of bridge arms, the energy requirements among the bridge arms may be unbalanced, and the problem can be solved by controlling the port voltage of the sub-module to dynamically adjust the voltage difference among the bridge arms, so that a circulating current with alternating current and direct current components is formed among the bridge arms, the energy balance among the bridge arms is maintained, the port voltage is kept stable, the equipment stably runs, and the alternating current and direct current electric energy required by the port is provided.
In an embodiment, as shown in fig. 6, the converter valve bridge arm sub-module SM includes a pre-converter 4 and a post-converter 5, wherein,
a first port of the pre-converter 4 is connected with a first port of the post-converter 5 in parallel, and a second port of the pre-converter 4 is connected with a common bus or a second port of the pre-converter 4 of the bridge arm sub-module SM of the other converter valve;
the second port of the post-stage converter 5 is connected to the external device 3. Specifically, the external device 3 includes devices such as a photovoltaic device, a fan, an energy storage device, an electric vehicle, or a load, and the rear converter 5 may be connected to one or more of the devices, which is not limited herein.
Specifically, for a single converter valve bridge arm submodule SM, energy of the single converter valve bridge arm submodule SM can be provided by a high-voltage port or a low-voltage port, a system controller controls the turn-off and the turn-on of a power electronic switch in a power unit through collected related data, so that each stage of energy storage elements in the converter valve bridge arm submodule SM can be charged and discharged, the access voltage and the access time of each stage of energy storage elements can be reasonably adjusted according to the difference of input/output power of each submodule, the energy storage elements can be maintained to work in a working range in a stable voltage mode, stable and reliable converter valve bridge arm submodule SM voltage is provided, and the converter valve bridge arm submodule SM can operate stably.
In one embodiment, as shown in fig. 7, the pre-converter 4 is a half-bridge circuit or a full-bridge circuit. In particular, the practical application circuit is not limited to the above topology. In addition, the capacitance symbol only represents the function of the energy storage element, and is not limited to be composed of a single capacitor, a plurality of capacitor series, parallel connection or storage batteries.
In an embodiment, the post-converter 5 is a back-to-back DC-DC converter. Specifically, the rear converter 5 is used for connecting external devices 3 such as a photovoltaic device, a fan, an energy storage device, an electric vehicle or a load, and has an electrical isolation function, and is used for performing an electrical isolation function between the connection device and the main device, so as to avoid damage to the connection device due to an excessively high voltage of the common bus, and the form of the rear converter 5 includes, but is not limited to, a DC/DC transformer having unidirectional or bidirectional energy flow and composed of power electronic devices, for example, as shown in the rear DC-DC converter in fig. 7, which can flexibly control input/output of energy according to requirements.
In an embodiment, the pre-converter 4 includes: an energy storage element and a power electronic switch. Specifically, it is generally composed of a plurality of fully controlled devices (e.g., IGBTs, GTOs, etc.) and anti-parallel diodes connected thereto, as shown in fig. 7, for example. By controlling the on-off of the switch of the sub-module, the voltage of the energy storage element can be output to the bridge arm interface terminal in a bypass, forward or reverse mode.
In one embodiment, the power electronic switch is a diode, or a MOSFET, or an IGBT or an IGCT. Specifically, the power electronic switch here uses diode, MOSFET, IGBT, IGCT as an example, and the power electronic switch of other types can be used as long as the switch on-off function of controlling converter valve bridge arm submodule SM can be realized, the utility model discloses not use this as the limit.
In an embodiment, the energy storage element is a capacitor or a battery. Specifically, the energy storage element here takes a capacitor or a storage battery as an example, and may also be other devices capable of storing energy, which is not limited by the present invention.
The utility model provides a pair of many level topology distributing type conversion equipment based on modularization, its device whole capacity, voltage level are adjustable and the integrated level is high, have saved the auxiliary system quantity greatly to can realize the mixed cascade of multiple new forms of energy equipment, novel load, electric automobile and energy storage component, and can directly merge into middling pressure, high-pressure friendship, among the direct current electric wire netting, realize the transform of electric energy and the friendly management of equipment. When alternating current-direct current electric energy conversion is carried out, the advantages brought by the modular multilevel topology can be utilized, alternating current side output with high electric energy quality is provided, and the use of a large-scale filter on the alternating current side is avoided.
And simultaneously, the utility model provides a device uses modularization plug-in design with low-voltage apparatus's kneck, and single module equipment trouble or submodule piece trouble can be extracted, directly detect and replace, very big improvement the flexibility and the reliability of device, reduced the maintenance work volume and the maintenance cost at device field station.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A modular based multi-level topology distributed transformation apparatus, comprising: the converter valve bridge arm units are formed by cascading a plurality of converter valve bridge arm sub-modules; the converter valve bridge arm unit is connected with at least one external device in a plug-in manner.
2. The modular-based multi-level topology distributed conversion device according to claim 1, wherein the converter valve bridge arm units are connected in parallel.
3. The modular based multilevel topology distributed conversion device of claim 1, wherein the converter valve bridge arm units are connected in series.
4. The modular multi-level topology distributed conversion device according to claim 1, wherein every two converter valve bridge arm units are connected in series to form a converter valve bridge arm, and the upper end and the lower end of the plurality of converter valve bridge arms are connected in cascade.
5. The modular based multilevel topology distributed conversion apparatus of claim 1, wherein the converter valve bridge arm sub-modules comprise a pre-stage converter and a post-stage converter, wherein,
a first port of the preceding converter is connected with a first port of the subsequent converter in parallel, and a second port of the preceding converter is connected with a common bus or a second port of the preceding converter of other converter valve bridge arm submodules;
and the second port of the post converter is connected with an external device.
6. The modular based multi-level topology distributed conversion apparatus according to claim 5, wherein said pre-converter is a half bridge circuit or a full bridge circuit.
7. The modular based multilevel topology distributed conversion apparatus of claim 5, wherein the post-stage converter is a back-to-back DC-DC converter.
8. The modular based multilevel topology distributed conversion apparatus of claim 5, wherein the pre-converter comprises: an energy storage element and a power electronic switch.
9. The modular based multilevel topology distributed conversion apparatus of claim 8, wherein the power electronic switch is a diode, or a MOSFET, or an IGBT or an IGCT.
10. The modular based multilevel topology distributed conversion apparatus of claim 8, wherein the energy storage element is a capacitor or a battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220417936.4U CN217115940U (en) | 2022-02-28 | 2022-02-28 | Multi-level topology distributed conversion device based on modularization |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220417936.4U CN217115940U (en) | 2022-02-28 | 2022-02-28 | Multi-level topology distributed conversion device based on modularization |
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| CN202220417936.4U Active CN217115940U (en) | 2022-02-28 | 2022-02-28 | Multi-level topology distributed conversion device based on modularization |
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