CN113972680A - High-frequency isolated medium-voltage distribution network flexible interconnection system - Google Patents
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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
- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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 flexible interconnected system of medium voltage distribution network that high frequency was kept apart, its characterized in that, the system includes: the system comprises a first modular multilevel converter, a direct current transformer and a second modular multilevel converter; wherein: the direct current side of the first modular multilevel converter is connected with a first direct current port of a direct current transformer; the direct current side of the second modular multilevel converter is connected with a second direct current port of the direct current transformer; and the input full-bridge converter and the output full-bridge converter of the direct current transformer are coupled and connected through a high-frequency transformer. Through the technical scheme of this application, the flexible interconnected system of medium voltage distribution network of the high frequency isolation that the construction flexibility is stronger, the reliability is higher has effectively reduced the total volume and the weight of equipment, realizes electrical isolation and provides reliable ground connection for direct current system.
Description
Technical Field
The embodiment of the invention relates to the power technology, in particular to a high-frequency isolated flexible interconnection system for a medium-voltage distribution network.
Background
With the continuous development and perfection of power grid construction, medium voltage distribution networks are facing a series of development bottlenecks: firstly, the power load of the power distribution network is rapidly increased, and the problems of tension of power distribution corridors, overhigh power distribution and transformation load rate, unbalanced feeder line load distribution and the like occur in the power distribution network in some areas; the open-loop operation influences the improvement of the power supply reliability of the medium-voltage distribution network, statistics show that more than 80% of user power failure is caused by the side of the distribution network, and the open-loop distribution network transformed by distribution automation still cannot avoid short-time power failure during fault switching operation; thirdly, along with the development and large-scale popularization of distributed energy sources and the development of high-precision industries, the requirements of users on power supply reliability and power supply quality are increasingly improved, the power distribution network has the characteristics of various operation modes, complex trend distribution form and the like, the capacity of the medium-voltage power distribution network for absorbing clean energy is limited by open-loop operation, and the access of a large-scale distributed power supply cannot be met. For the closed-loop operation of a medium-voltage distribution network, the closed-loop interconnection among different power supplies can obviously increase the short-circuit capacity of the distribution network, and meanwhile, due to the influence of potential difference and short-circuit impedance difference at the outlet of the feeder lines of different transformer substations, very large closed-loop current can appear in the system to form an electromagnetic looped network, so that the safe and reliable operation of the power grid is directly influenced.
Therefore, how to implement a safety loop between multiple power supplies is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a high-frequency isolated medium-voltage distribution network flexible interconnection system, which is constructed with stronger flexibility and higher reliability, effectively reduces the total volume and weight of equipment, realizes electrical isolation and provides reliable grounding for a direct-current system.
In a first aspect, an embodiment of the present invention provides a high-frequency isolated flexible interconnection system for a medium-voltage distribution network, where the system includes: the system comprises a first modular multilevel converter, a direct current transformer and a second modular multilevel converter; wherein,
the direct current side of the first modular multilevel converter is connected with a first direct current port of a direct current transformer; the direct current side of the second modular multilevel converter is connected with a second direct current port of the direct current transformer;
and the input full-bridge converter and the output full-bridge converter of the direct current transformer are coupled and connected through a high-frequency transformer.
Further, the first dc port of the dc transformer corresponds to the input full-bridge converter; the second dc port of the dc transformer corresponds to the output full bridge converter.
Further, the alternating current side of the first modular multilevel converter is connected with a first alternating current distribution network; the ac side of the second modular multilevel converter is connected to a second ac distribution network.
Furthermore, the direct current ports of the first modular multilevel converter and the second modular multilevel converter are respectively connected with the direct current ports of the input full-bridge converter and the output full-bridge converter of the direct current transformer to form two independent sections of direct current buses, and the alternating current ports of the first modular multilevel converter and the second modular multilevel converter are respectively connected into two different medium-voltage alternating current distribution lines.
Furthermore, the first modular multilevel converter and the second modular multilevel converter respectively control the voltage stability of the direct current buses at two sides, and the direct current transformer controls the power transmitted to the second modular multilevel converter by the first modular multilevel converter so as to realize the mutual assistance of the active power between the first alternating current distribution network and the second alternating current distribution network.
Further, the first modular multilevel converter and the second modular multilevel converter respectively and independently control reactive power emitted by the alternating current ports of the first modular multilevel converter and the second modular multilevel converter so as to adjust the reactive power of the first alternating current distribution network and the second alternating current distribution network.
Further, the direct current transformer is formed by connecting input and output of double active full bridges in series, and the transformation ratio of a medium-high frequency alternating current link in each double active full bridge is 1.
The embodiment of the invention provides a high-frequency isolated medium-voltage distribution network flexible interconnection system, which comprises: the system comprises a first modular multilevel converter, a direct current transformer and a second modular multilevel converter; wherein: the direct current side of the first modular multilevel converter is connected with a first direct current port of a direct current transformer; the direct current side of the second modular multilevel converter is connected with a second direct current port of the direct current transformer; and the input full-bridge converter and the output full-bridge converter of the direct current transformer are coupled and connected through a high-frequency transformer. Through the technical scheme of this application, the direct current transformer that adopts the compactification design replaces the hookup transformer in the scheme of conventional gentle straight back, and direct current transformer is based on two initiative full-bridge transform technologies, and its interchange link adopts high frequency transformer, can effectively reduce the overall volume and the weight of equipment, can realize the electric isolation of interconnection both sides alternating current distribution network again simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of a high-frequency isolated medium-voltage distribution network flexible interconnection system provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another high-frequency isolated medium-voltage distribution network flexible interconnection system provided in the embodiment of the invention;
fig. 3 is a schematic diagram of a primary loop topology of a high-frequency isolated medium-voltage distribution network flexible interconnection system provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
In order to limit the short-circuit capacity of the power system and avoid the occurrence of electromagnetic looped networks, high-voltage distribution networks in the same region generally adopt a zone operation method, and when the high-voltage distribution networks in the same region normally operate, interconnection switches between different regions are in an off state, wherein the high-voltage distribution networks mainly comprise 110kV and 220kV voltage grades. And the medium-voltage distribution network adopts a method of 'closed-loop design and open-loop operation', and contact switches among distribution lines are in a disconnected state during normal operation, wherein the medium-voltage distribution network mainly comprises 35kV and 10kV voltage grades.
In recent years, theoretical research and manufacturing processes of power electronic technology are continuously making breakthrough progress, and popularization and application of flexible direct current technology are promoted. The flexible direct current distribution technology based on the voltage source type current converter has the advantages of large transmission capacity, small transmission loss rate, low cable manufacturing cost, high power supply quality, flexible and friendly access, flexible control and the like, and can play an important role in the aspects of upgrading and transforming a power distribution network, asynchronous interconnection of an alternating current system, grid-connected operation of a distributed power supply and the like. Research shows that due to the immaturity of current key equipment such as a direct current breaker, a direct current cable and the like and the imperfect construction standard, the transformation of the existing alternating current power distribution system by utilizing the back-to-back flexible ring network device is more in line with the development direction of the modern urban power distribution system, and is an important measure for upgrading the future power distribution system. On the basis of fully playing the potential of the existing network structure and equipment of the power distribution network, the operation control and optimization performance of the system can be obviously improved by installing the flexible ring network control device at the key node.
The existing conventional medium-voltage back-to-back flexible interconnection system is designed similarly to a high-voltage direct-current back-to-back interconnection system, two sets of alternating current/direct current (AC/DC) flexible conversion devices are respectively connected to two medium-voltage alternating current distribution lines, and direct current sides of the two sets of AC/DC flexible conversion devices are connected to form a back-to-back interconnection topology, so that active adjustment of alternating current power at two sides is realized. The main problems of the application of the design scheme in the field of interconnection of medium-voltage distribution networks are as follows:
firstly, in order to realize electrical isolation and provide reliable grounding for a direct current system, AC/DC devices on two sides are required to be provided with power frequency connecting transformers with matched capacities and grounding is arranged at a neutral point on a valve side, the volume and weight of the two connecting transformers occupy larger proportion in the overall volume and weight of the system, and the small-size and compact design when the connecting transformers are arranged in a power distribution room and a prefabricated cabin in medium-voltage power distribution is not facilitated;
secondly, direct current sides of the AC/DC devices at two ends are directly connected to form a direct current bus, when the direct current bus is used as an interface to provide direct current access for a direct current type load and a distributed power supply, only one access point is provided, and the direct current side power distribution flexibility is poor.
Therefore, the embodiment of the invention provides a high-frequency isolated medium-voltage distribution network flexible interconnection system.
Fig. 1 is a schematic structural diagram of a high-frequency isolated flexible interconnection system of a medium-voltage distribution network according to an embodiment of the present invention, and the technical solution according to the embodiment of the present invention is applicable to a case of performing electrical isolation in the flexible interconnection system of the medium-voltage distribution network.
As shown in fig. 1, a flexible interconnection system of a high-frequency isolated medium-voltage distribution network provided in an embodiment of the present invention includes: a first modular multilevel converter 110, a dc transformer 120, and a second modular multilevel converter 130; wherein,
the direct current side of the first modular multilevel converter is connected with a first direct current port of a direct current transformer; the direct current side of the second modular multilevel converter is connected with a second direct current port of the direct current transformer;
and the input full-bridge converter and the output full-bridge converter of the direct current transformer are coupled and connected through a high-frequency transformer.
The first modular multilevel converter 110 may be a flexible dc converter without an isolation transformer, in which dc-ac conversion is implemented.
The dc transformer 120 may refer to a dual active full bridge based dc transformer in which a fixed dc voltage may be converted into a variable dc voltage.
The double-active full-bridge converter mainly comprises an input full-bridge converter, an output full-bridge converter and a high-frequency transformer, wherein the input full-bridge converter and the output full-bridge converter are connected through the high-frequency transformer in a coupling mode, the high-frequency transformer is not internally electrically connected, and current cannot flow to the output full-bridge converter from the input full-bridge converter, so that the electrical isolation of alternating-current power distribution networks on two sides of the interconnection can be realized.
The second modular multilevel converter 130 may refer to a flexible dc converter without an isolation transformer, in which dc to ac conversion is achieved.
It is to be understood that the first modular multilevel converter may be a substitute for one, in order to distinguish different modular multilevel converters that perform corresponding logic from one another in the embodiment, and any modular multilevel converter selected from the modular multilevel converters is selected so as to explain the performing logic from the selected modular multilevel converter, so that the modular multilevel converter that appears first in this document is referred to as a first modular multilevel converter, and other modular multilevel converters that appear later and are different from the first modular multilevel converter are referred to as a second modular multilevel converter, and will not be described in detail later.
The direct current side of the first modular multilevel converter is connected with a first direct current port of a direct current transformer; the dc side of the second modular multilevel converter is connected to the second dc port of the dc transformer. The alternating current side of the first modular multilevel converter is connected with a first alternating current distribution network; the ac side of the second modular multilevel converter is connected to a second ac distribution network. Wherein the first DC port of the DC transformer corresponds to an input full-bridge converter; the second dc port of the dc transformer corresponds to the output full bridge converter. The first modular multilevel converter and the second modular multilevel converter are directly connected with the direct current transformer, and a power frequency connection transformer with matched capacity does not need to be configured, so that the overall volume and weight of the equipment are reduced.
The embodiment of the invention provides a high-frequency isolated medium-voltage distribution network flexible interconnection system, wherein a direct current side of a first modular multilevel converter is connected with a first direct current port of a direct current transformer; the direct current side of the second modular multilevel converter is connected with the second direct current port of the direct current transformer, so that the overall volume and weight of equipment are reduced, and the miniaturization and compact design of the equipment in a power distribution room and a prefabricated cabin in medium-voltage power distribution is facilitated; the input full-bridge converter and the output full-bridge converter of the direct current transformer are in coupling connection through the high-frequency transformer, and electric isolation of alternating current power distribution networks on two sides of the interconnection is achieved.
In one alternative of this embodiment, this embodiment may be combined with each of the alternatives of one or more of the embodiments described above. Fig. 2 is a schematic structural diagram of another high-frequency isolated medium-voltage distribution network flexible interconnection system provided in an embodiment of the present invention, where the system further includes:
the first modular multilevel converter and the second modular multilevel converter respectively control the voltage stability of the direct current buses at two sides, and the direct current transformer controls the power transmitted to the second modular multilevel converter by the first modular multilevel converter so as to realize the mutual assistance of active power between the first alternating current distribution network and the second alternating current distribution network.
The high-frequency transformer in the direct-current transformer is coupled with the input full-bridge converter and the output full-bridge converter, and current cannot flow; the direct current side of the first modular multilevel converter is connected with a first direct current port of a direct current transformer to form a first direct current bus; and the direct current side of the second modular multilevel converter is connected with a second direct current port of the direct current transformer to form a second direct current bus. The two sections of direct current buses can respectively and independently provide access ports for direct current type loads, energy storage, distributed new energy and the like, and a dual-power direct current power distribution system with higher flexibility and reliability is constructed.
Optionally, the dc transformer controls the power transmitted from the first modular multilevel converter to the second modular multilevel converter, for example, the rated power of the dc transformer is 10 mb, and the dc transformer can control the current to convert the power between 0 mb and 10 mb, thereby realizing active regulation of ac power on both sides of the dc transformer.
The power mutual aid means that lines of the first alternating current distribution network and the second alternating current distribution network are distribution lines, and power is supplied to loads through the lines by power supplies, so that the loads of the power supplies on two sides are balanced, and the active power mutual aid between the first alternating current distribution network and the second alternating current distribution network is realized.
Optionally, the first modular multilevel converter and the second modular multilevel converter each independently control reactive power emitted from an ac port thereof, so as to perform reactive power adjustment on the first ac distribution network and the second ac distribution network.
The reactive power of the alternating current side of the first modular multilevel converter and the alternating current side of the second modular multilevel converter and the alternating current line is controlled, and the reactive power of the line can be controlled by controlling the current of the alternating current line.
The embodiment of the invention provides a high-frequency isolated medium-voltage distribution network flexible interconnection system, which is characterized in that a first modularized multi-level converter and a second modularized multi-level converter are used for respectively controlling the voltage stability of direct current buses at two sides, and a direct current transformer is used for controlling the power transmitted to the second modularized multi-level converter by the first modularized multi-level converter so as to realize the mutual assistance of active power between a first alternating current distribution network and a second alternating current distribution network; the two sections of direct current buses can respectively and independently provide access ports for direct current type loads, energy storage, distributed new energy and the like, and a dual-power direct current power distribution system with higher flexibility and reliability is constructed; the first modular multilevel converter and the second modular multilevel converter respectively and independently control reactive power emitted by the alternating current ports of the first modular multilevel converter and the second modular multilevel converter so as to realize reactive power regulation on the first alternating current distribution network and the second alternating current distribution network.
In one alternative of this embodiment, this embodiment may be combined with each of the alternatives of one or more of the embodiments described above. Fig. 3 is a schematic diagram of a primary loop topology of a flexible interconnection system of a high-frequency isolated medium-voltage distribution network according to an embodiment of the present invention, where the primary loop topology includes:
the direct current ports of the first modular multilevel converter and the second modular multilevel converter are respectively connected with the direct current ports of the input full-bridge converter and the output full-bridge converter of the direct current transformer to form two independent direct current buses, and the alternating current ports of the first modular multilevel converter and the second modular multilevel converter are respectively connected into two different medium-voltage alternating current distribution lines.
The direct current transformer is formed by connecting input and output of double active full bridges in series, and the transformation ratio of a high-frequency alternating current link in each double active full bridge is 1.
In the medium-voltage distribution network, the voltages of the first alternating-current distribution network and the second alternating-current distribution network are the same and are both 10KV, after alternating-current and direct-current conversion, the voltage on the direct-current side is positive and negative 10KV, that is to say, the voltages of the first alternating-current distribution network and the second alternating-current distribution network are 20KV direct-current voltages, and the voltages of the first alternating-current distribution network and the second alternating-current distribution network are the same, so that the transformation ratio is 1.
The alternating current sides of the first modular multilevel converter and the second modular multilevel converter have zero sequence components, and the direct current sides can become common mode components during coupling; when the common mode component on the direct current side is coupled, the alternating current side becomes a zero sequence component. The direct current transformer is electrically isolated in the middle, direct currents on two sides cannot be mutually transmitted, the direct current transmission to the direct current bus can be stopped, and zero sequence components or common mode components in an alternating current/direct current system can be effectively blocked.
The embodiment of the invention provides a high-frequency isolated medium-voltage distribution network flexible interconnection system with a topological structure, wherein a direct-current transformer adopts a modular design based on a double-active full-bridge high-frequency power module, can effectively block zero-sequence components or common-mode components in an alternating-current/direct-current system, and realizes the electrical isolation of distribution lines at two ends of interconnection. The whole high-frequency isolated medium-voltage distribution network flexible interconnection system can realize interconnection and power mutual aid of a first alternating-current distribution network and a second alternating-current distribution network, and meanwhile, two direct-current buses of the system can also lead out direct-current distribution ports, so that direct-current access and distribution modes with higher flexibility and reliability are provided for direct-current loads, energy storage, distributed new energy sources and the like.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A high frequency isolated flexible interconnection system for medium voltage distribution networks, said system comprising: the system comprises a first modular multilevel converter, a direct current transformer and a second modular multilevel converter; wherein,
the direct current side of the first modular multilevel converter is connected with a first direct current port of a direct current transformer; the direct current side of the second modular multilevel converter is connected with a second direct current port of the direct current transformer;
and the input full-bridge converter and the output full-bridge converter of the direct current transformer are coupled and connected through a high-frequency transformer.
2. The system of claim 1, wherein the dc transformer first dc port corresponds to an input full-bridge converter; the second dc port of the dc transformer corresponds to the output full bridge converter.
3. The system of claim 1, wherein an ac side of the first modular multilevel converter is connected to a first ac power distribution grid; the ac side of the second modular multilevel converter is connected to a second ac distribution network.
4. The system of claim 1, wherein the dc ports of the first and second modular multilevel converters are connected to the dc ports of the input and output full-bridge converters of the dc transformer, respectively, to form two independent dc buses, and the ac ports of the first and second modular multilevel converters are connected to two different medium voltage ac distribution lines, respectively.
5. The system of claim 1, wherein the first and second modular multilevel converters control the stabilization of the dc bus voltage on both sides, and the dc transformer controls the power transferred from the first modular multilevel converter to the second modular multilevel converter to achieve real power coordination between the first and second ac power distribution networks.
6. The system of claim 1, wherein the first modular multilevel converter and the second modular multilevel converter each individually control reactive power emitted from their ac ports to provide reactive power regulation to the first ac distribution grid and the second ac distribution grid.
7. The system of claim 1, wherein the dc transformer is a dc transformer based on a series connection of input and output of dual active full bridges, and the transformation ratio of the high frequency ac link in each dual active full bridge is 1.
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