CN112152261A - Power distribution network system based on power electronic transformer alternating current-direct current hybrid networking - Google Patents
Power distribution network system based on power electronic transformer alternating current-direct current hybrid networking Download PDFInfo
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- 230000006855 networking Effects 0.000 title claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 7
- 238000010248 power generation Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000002955 isolation Methods 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000003763 carbonization Methods 0.000 description 1
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a power distribution network system based on a power electronic transformer alternating current-direct current hybrid networking, which comprises a large power grid, a distributed renewable energy source end, a load end and a power electronic transformer, wherein the distributed renewable energy source end is used as a standby power supply to supply power to the load end during the middle end period of the input voltage of the large power grid, and transmits the converted electric energy to the large power grid through the power electronic transformer during the low valley period of power consumption so as to realize the bidirectional transmission of power and avoid the interference of the distributed renewable energy source to the main grid when the distributed renewable energy source is connected into the large power grid. Through making big electric wire netting and distributed energy carry out the two-way flow of cooperation and power, the optimization operation and the control of the electric wire netting of being convenient for, interference to the major network caused when having avoided traditional distributed energy to insert big electric wire netting, adopt different voltage types to supply power to different load demands simultaneously, very big reinforcing energy transmission efficiency, reduced energy loss.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a power distribution network system based on power electronic transformer alternating current-direct current hybrid networking.
Background
Distributed renewable energy has become the important way of promoting energy transformation at present, have enormous development potential in the dense area of our country load especially coastal area, IT is IT type load, frequency conversion air conditioner and electric automobile to regard generalized direct current energy utilization equipment proportion of the representative as rising fast, ITs current conversion link has seriously reduced the system energy efficiency. The distributed renewable energy resource reliable consumption and the important requirements of direct current load economic energy are met, and the alternating current-direct current hybrid power grid has obvious advantages in the aspects of economy, reliability, flexibility and the like.
At present, the problems of high alternating current and direct current energy conversion loss, poor power distribution and utilization flexibility and low power distribution and utilization ring section matching performance in a distribution network are increasingly highlighted, the traditional energy is exhausted day by day, and the pressure of low carbonization of an energy structure is increased day by day. The adoption of the AC/DC distribution and utilization technology can effectively reduce the intermediate link of AC/DC conversion in the distribution and utilization process, improve the efficiency, reliability and flexibility of distribution and utilization, properly solve the problem of system stability after the distributed new energy and energy storage system is accessed, and is an important development direction in the international distribution and utilization research field.
Disclosure of Invention
The invention aims to provide a power distribution network system based on a power electronic transformer alternating current-direct current hybrid networking, and aims to solve the technical problems of high alternating current-direct current energy conversion loss, poor power distribution flexibility and low power distribution loop matching performance in a distribution network in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
the utility model provides a distribution network system based on mixed network deployment of power electronic transformer alternating current-direct current, includes big electric wire netting, distributed renewable energy source end, load end and power electronic transformer, its characterized in that: the distributed renewable energy source end serves as a standby power supply to supply power to the load end during the middle period of the input voltage of the large power grid, and the distributed renewable energy source end transmits the converted electric energy to the large power grid through the power electronic transformer during the low-ebb period of power utilization so as to realize bidirectional power transmission and avoid interference of the distributed renewable energy source to the main grid when the distributed renewable energy source is connected to the large power grid;
the distributed renewable energy source end transmits electric energy in at least two voltage levels, and the power electronic transformer is upwards provided with buses corresponding to the voltage levels one to one.
As a preferable aspect of the present invention, the distributed renewable energy source terminal includes a photovoltaic power generation system and a photothermal power generation system having different voltage levels.
As a preferable mode of the present invention, the power electronic transformer is connected to the photovoltaic power generation system through a 240V dc bus, and the power electronic transformer is connected to the photothermal power generation system through a 380V ac bus.
As a preferable scheme of the invention, at least two power electronic transformers are provided, and the 240V direct current buses and the 380V alternating current buses of each power electronic transformer are connected through an electrical interconnection bus to realize free bidirectional power flow between ports of the power electronic transformers at different voltage levels.
As a preferable mode of the present invention, the photovoltaic power generation system converts AC power into 340V DC power through the DC/AC converter and then connects to the 240V DC bus, and the photothermal power generation system converts AC power into 380V AC power through the DC/DC converter and then connects to the 380V AC bus.
As a preferable scheme of the present invention, the load end includes an ac load and a dc load, the power electronic transformer is connected to the large power grid and the ac load sequentially through the 380V ac bus and the ac circuit breaker, and the ac circuit breaker cuts off a corresponding circuit when any one or more of the large power grid, the power electronic transformer, and the ac load fails; the power electronic transformer is connected with the direct current load sequentially through the 240V direct current bus and the direct current breaker, and the direct current breaker cuts off a corresponding circuit when any one or two of the power electronic transformer and the direct current load are in fault.
As a preferable scheme of the present invention, the two power electronic transformers synchronously adjust power according to a relationship between output of distributed renewable energy and load on the 240V dc bus and the 380V ac bus, so that both the two power electronic transformers are in an optimal operating state.
As a preferable scheme of the invention, the power electronic transformer adopts a high-frequency isolation double-active full-bridge DC/DC transformer, and the power unit of the power electronic transformer adopts a topological structure that the high-voltage input sides are connected in series and the low-voltage output sides are connected in parallel to improve the capacity grade of the voltage grade of the system.
As a preferred scheme of the invention, the power electronic transformer adopts a high-power centralized module to reduce the conversion links and conversion times of power distribution and utilization alternating current and direct current and improve the overall efficiency of the system.
As a preferable scheme of the present invention, the load terminal specifically includes an ac cabinet and a motor using an ac power supply, and a dc air conditioner, an IT device, and a charging pile using a dc power supply.
Compared with the prior art, the invention has the following beneficial effects:
the large power grid and the distributed energy are cooperatively matched and the power flows bidirectionally, so that the optimized operation and control of the power grid are facilitated, the interference of the traditional distributed energy to the main grid when the distributed energy is connected into the large power grid is avoided, and meanwhile, different voltage types are adopted for supplying power for different load requirements, so that the energy transmission efficiency is greatly enhanced, and the energy loss is reduced.
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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 description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is an overall block diagram of a system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a power distribution network system based on a power electronic transformer ac/dc hybrid networking, which uses a multi-port multifunctional power electronic transformer as a system energy router, reasonably configures a fault current controller to realize stable and efficient operation of the system, and simultaneously realizes multiple distributed renewable energy high-ratio access and ac/dc distribution multi-stage hybrid connection through the power electronic transformer networking. Through comprehensive energy storage systems such as electricity storage, heat storage and the like, efficient complementation of source, network, charge and storage is realized, and the influence of high-proportion access of various distributed energy sources on a power grid is improved.
The specific implementation mode is that the system comprises two 1MW power electronic transformers, a photovoltaic access unit, a photo-thermal access unit, a rectifier and inverter, a cable line, a line protection device, various alternating current and direct current loads and the like, and the specific implementation process is as follows:
an alternating current 10kV bus is connected from a large power grid nearby as input voltage of two power electronic transformers and is used as a source of a system.
The voltage grades of the two three-port multifunctional power electronic transformers are respectively connected with alternating current 10kV, alternating current 380V and direct current 240V.
The solar photovoltaic system on the spot is connected into a 240V direct current bus through a DC/DC converter, and can be used as a standby power supply to supply power to a load when the input voltage of a large power grid is interrupted, so that the power failure accident is reduced to the maximum extent, and meanwhile, the electric energy generated by photovoltaic can be transmitted to the large power grid through a power electronic transformer during the power consumption valley, and the bidirectional transmission of power is realized.
Meanwhile, the distributed energy can be used for load power regulation control of the power electronic transformer, and when the load demand is small, the distributed energy can be used for power supply, so that the distributed energy can be completely consumed on the spot as far as possible, and the economic efficiency can be improved.
The photothermal power generator is connected into a 380V alternating current bus, and effective connection of distributed energy is achieved.
The 380VAC bus adopts single bus connection and is connected into an AC cabinet and an AC load of a motor; the 240VDC bus adopts single bus connection and is connected to a direct current air conditioner, IT equipment and a charging pile direct current load.
All connecting lines are connected by cables, so that the reliability is enhanced and the occupied area is reduced.
The invention relates to a novel AC/DC hybrid distributed renewable energy system based on networking operation of a power electronic transformer, which is a novel AC/DC hybrid distributed energy system provided under the condition of facing a future new energy system. Meanwhile, different voltage types are adopted for supplying power for different load requirements, so that the energy transmission efficiency is greatly enhanced, and the energy loss is reduced.
The multifunctional power electronic transformer adopts a DAB (digital active converter) based on high-frequency isolation double-active full-bridge, and a DAB power unit of the multifunctional power electronic transformer adopts a topological structure that a high-voltage input side is connected in series and a low-voltage output side is connected in parallel, so that the voltage grade and the capacity grade of the system are improved, and the multifunctional power electronic transformer is suitable for connection and power conversion of high-voltage and low-voltage alternating current and direct current systems. The basic principle of DAB is that a full-bridge alternating current-direct current hybrid distributed renewable energy technology is used to convert direct current into a medium-high frequency alternating current signal (generally, a square wave with a duty ratio of 50%), and the medium-high frequency alternating current signal is coupled to the other side through a transformer and converted into a direct current signal through a full-bridge converter. The medium-high frequency transformer not only realizes the isolation and matching of voltage, but also realizes the transient storage of energy, and in application, the transmission of active power can be effectively adjusted by changing the phase difference of alternating current signals on two sides. DAB has reactive power demand little, high frequency, high efficiency and high power density to and the voltage of components and parts and current utilization ratio high advantage.
The alternating current-direct current hybrid power distribution network system is divided into 3 voltage levels, wherein a 10kV Alternating Current (AC) side is a power grid power supply incoming line, and two newly-outgoing return lines are respectively connected to the incoming lines of two 1MW power electronic transformers; A240V direct current voltage (DC) bus is connected to distributed renewable energy sources (photovoltaic power generation) and a direct current load, and a 380V alternating current voltage (AC) bus is connected to distributed renewable energy sources (photothermal power generation) and an alternating current load. The main equipment of the system is two power electronic transformers with 1MW capacity, and three ports of the transformers are provided with line protection devices so as to ensure that the equipment cannot be damaged when a fault occurs. The 240V DC side and the 380V AC side of the two 2MW power electronic transformers respectively realize the electrical direct interconnection between the two power electronic transformers through a single bus, and the flexible power supply of the two power electronic transformers is realized. Industrial loads such as an alternating current cabinet and a motor are supplied with power by an alternating current bus, office and life direct current air conditioners, IT equipment and charging piles are supplied with power by a direct current bus, a photovoltaic system is connected to a 380V alternating current bus through a direct current voltage to alternating current voltage converter (DC/AC), and a photothermal system is connected to a 240V alternating current bus through a direct current voltage to direct current voltage converter (DC/DC). A power electronic transformer group system is formed by connecting a No. 1 power electronic transformer and a No. 2 power electronic transformer in a back-to-back mode through voltage grade buses, and free bidirectional power flow between ports of the voltage grade buses is achieved.
According to the relationship between the output of distributed renewable energy sources of each bus section and the load, the power modules are reasonably put into the power module through related control measures, the power of the No. 1 power electronic transformer and the power of the No. 2 power electronic transformer can be synchronously adjusted, the power electronic transformer is beneficial to being in the optimal working condition running state, and therefore the running efficiency of the power electronic transformer is improved, and the energy efficiency of the multi-port power electronic transformer is optimal. Compared with a traditional transformer, the multi-port power electronic transformer has the advantages that power optimization is achieved, the converter adopts a high-power centralized module, the number of power distribution and utilization alternating current-direct current conversion links and times is reduced, the operating efficiency of the high-power centralized module is higher than that of a distributed low-power converter, and therefore the overall efficiency of an alternating current-direct current power distribution system is improved.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. The utility model provides a distribution network system based on mixed network deployment of power electronic transformer alternating current-direct current, includes big electric wire netting, distributed renewable energy source end, load end and power electronic transformer, its characterized in that: the distributed renewable energy source end serves as a standby power supply to supply power to the load end during the middle period of the input voltage of the large power grid, and the distributed renewable energy source end transmits the converted electric energy to the large power grid through the power electronic transformer during the low-ebb period of power utilization so as to realize bidirectional power transmission and avoid interference of the distributed renewable energy source to the main grid when the distributed renewable energy source is connected to the large power grid;
the distributed renewable energy source end transmits electric energy in at least two voltage levels, and the power electronic transformer is upwards provided with buses corresponding to the voltage levels one to one.
2. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 1, characterized in that: the distributed renewable energy source end comprises a photovoltaic power generation system and a photo-thermal power generation system with different voltage levels.
3. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 2, characterized in that: the power electronic transformer is connected with the photovoltaic power generation system through a 240V direct current bus, and the power electronic transformer is connected with the photo-thermal power generation system through a 380V alternating current bus.
4. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 1, characterized in that: the power electronic transformers are at least two, and 240V direct current buses and 380V alternating current buses of each power electronic transformer are connected through electrical interconnection buses so as to realize free bidirectional power flow among ports of the power electronic transformers with different voltage levels.
5. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 2, characterized in that: the photovoltaic power generation system is connected to the 240V direct current bus after alternating current is converted into 340V direct current through the DC/AC converter, and the photothermal power generation system is connected to the 380V alternating current bus after alternating current is converted into 380V alternating current through the DC/DC converter.
6. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 1, characterized in that: the load end comprises an alternating current load and a direct current load, the power electronic transformer is connected with the large power grid and the alternating current load sequentially through the 380V alternating current bus and the alternating current circuit breaker, and the alternating current circuit breaker cuts off a corresponding circuit when any one or more of the large power grid, the power electronic transformer and the alternating current load fails; the power electronic transformer is connected with the direct current load sequentially through the 240V direct current bus and the direct current breaker, and the direct current breaker cuts off a corresponding circuit when any one or two of the power electronic transformer and the direct current load are in fault.
7. The power distribution network system based on power electronic transformer alternating current-direct current hybrid networking of claim 4, characterized in that: and the two power electronic transformers synchronously adjust the power according to the magnitude relation between the output of the distributed renewable energy sources on the 240V direct current bus and the 380V alternating current bus and the magnitude relation between the loads so as to enable the two power electronic transformers to be in the optimal operation state.
8. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 1, characterized in that: the power electronic transformer adopts a high-frequency isolation double-active full-bridge DC/DC transformer, and a power unit for power electronic transformation adopts a topological structure that a high-voltage input side is connected in series and a low-voltage output side is connected in parallel so as to improve the capacity grade of the voltage grade of the system.
9. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 1, characterized in that: the power electronic transformer adopts a high-power centralized module to reduce the conversion links and conversion times of power distribution and utilization alternating current and direct current and improve the overall efficiency of the system.
10. The power distribution network system based on the alternating current-direct current hybrid networking of the power electronic transformer as claimed in claim 1, characterized in that: the load end specifically comprises an alternating current cabinet and a motor which use an alternating current power supply, and a direct current air conditioner, IT equipment and a charging pile which use a direct current power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011008077.5A CN112152261A (en) | 2020-09-23 | 2020-09-23 | Power distribution network system based on power electronic transformer alternating current-direct current hybrid networking |
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| CN202011008077.5A CN112152261A (en) | 2020-09-23 | 2020-09-23 | Power distribution network system based on power electronic transformer alternating current-direct current hybrid networking |
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| CN113472020A (en) * | 2021-06-29 | 2021-10-01 | 国网江苏省电力有限公司电力科学研究院 | Novel AC/DC hybrid data center power supply control system and control method |
| CN114844116A (en) * | 2022-07-04 | 2022-08-02 | 西安热工研究院有限公司 | In-plant photovoltaic and comprehensive energy load system and control method thereof |
| TWI833359B (en) * | 2022-09-19 | 2024-02-21 | 財團法人工業技術研究院 | Hybrid transformer apparatus and control method thereof |
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