CN110829433A - Novel electric energy interaction system - Google Patents
Novel electric energy interaction system Download PDFInfo
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- CN110829433A CN110829433A CN201911111157.0A CN201911111157A CN110829433A CN 110829433 A CN110829433 A CN 110829433A CN 201911111157 A CN201911111157 A CN 201911111157A CN 110829433 A CN110829433 A CN 110829433A
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- alternating current
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- direct current
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- electric 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
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a novel electric energy interaction system, which comprises an A system and a B system which are symmetrically distributed and have the same layout, wherein the A system and the B system are connected with a power grid through a double-splitting transformer, the A system and the B system respectively comprise 3 sections of alternating current buses and 1 section of direct current buses, a first switch is arranged between the first alternating current bus and the double-splitting transformer, and an alternating current interconnection switch is arranged between the second alternating current buses of the A system and the B system; the third alternating current bus is connected with the direct current bus, and a direct current interconnection switch is arranged between the direct current buses of the system A and the system B; the system disclosed by the invention can ensure the power supply reliability of the uninterrupted load in the system and realize the electricity economy.
Description
Technical Field
The invention relates to a novel electric energy interaction system.
Background
The energy crisis and the environmental pollution problem make the development and utilization of green clean renewable energy become the hot point of research. The construction of centralized photovoltaic and wind power generation stations causes the difficulty in the consumption of new energy power generation. In little grid technology development, combine together distributed generation and new forms of energy consumption to combine electric automobile's rapid development, with "the change is joined in marriage with light storage and is filled the integration degree of depth and combine, high proportion consumes renewable energy electricity generation inside little grid, accomplishes and utilizes on the spot, and high-efficient conversion reduces long distance transport, is the effective solution that improves new forms of energy consumption, has high practicality and practical meaning.
The micro-grid system can timely adjust the power generation and utilization of various energy sources according to the condition of peak-valley electricity price of a power grid by adjusting the charge and discharge of loads, an energy storage device and an electric automobile in the micro-grid, the most economical energy cost is selected as a target, energy storage batteries, electric automobile power battery resources and other adjustable load resources are fully utilized, the application of other energy sources such as cold, heat and water is considered in the future, the comprehensive management and control are realized, the energy efficiency utilization rate is improved, the asset and resource allocation is optimized, auxiliary service technical support means such as participating in peak-adjusting frequency-adjusting of the power grid are provided, and the overall energy benefit of the micro-grid system and the large-grid system is improved.
In recent years, electric vehicles have been developed rapidly, and their random moving load brings a serious challenge to power distribution networks. The electric automobile is an important element of a new energy microgrid system, the electric automobile power battery is used as a distributed mobile energy storage device to participate in microgrid adjustment, the electric automobile can be charged and discharged through regulation and control of the new energy microgrid system, the balance of the electric quantity and the power of a regional power grid is adjusted, regional power distribution capacity is not required to be increased in capacity, the charging requirement of the electric automobile can be met, the benefit can be brought to an electric automobile owner through the discharging action, the equipment utilization rate of the system can be improved, and meanwhile, the operation safety of the power grid is guaranteed. Therefore, the energy storage investment cost of the new energy microgrid can be greatly reduced, the economy of the new energy microgrid is improved, energy auxiliary service is realized, the electric automobile is changed from pure consumer products into energy service equipment, and the value maximization of the electric automobile is realized.
Disclosure of Invention
In order to solve the technical problems, the invention provides a novel electric energy interaction system so as to achieve the purposes that alternating current and direct current power supplies can be supplied mutually and the power supply reliability is ensured to the maximum extent.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a novel electric energy interaction system comprises an A system and a B system which are symmetrically distributed and have the same layout, wherein the A system and the B system are connected with a power grid through a double-split transformer, the A system and the B system respectively comprise 3 sections of alternating current buses and 1 section of direct current buses, a first switch is arranged between a first alternating current bus and the double-split transformer, a second switch is arranged between the first alternating current bus and a second alternating current bus, a third switch is arranged between a second alternating current bus and a third alternating current bus, and an alternating current interconnection switch is arranged between the A system and a second alternating current bus of the B system; the third alternating current bus is connected with the direct current bus, and a direct current interconnection switch is arranged between the direct current buses of the system A and the system B; the first alternating current bus is connected with a plurality of alternating current loads, the second alternating current bus is connected with a plurality of uninterrupted loads, and the direct current bus is connected with an energy storage battery, a fan, a photovoltaic power generation device, an electric automobile and a direct current load.
In the above scheme, an AC/DC converter is provided between the third AC bus and the DC bus.
In the scheme, the DC/DC converters are respectively arranged among the energy storage battery, the fan, the electric automobile and the direct current bus.
In the above scheme, an MPPT controller is arranged between the photovoltaic power generation device and the dc bus.
In the above scheme, a dc switch is arranged between the dc load and the dc bus.
In a further technical scheme, the AC/DC converter and the DC/DC converter are both bidirectional electric energy converters.
In a further technical scheme, an alternating current switch is arranged between the alternating current load and the first alternating current bus, and an alternating current switch is arranged between the uninterrupted load and the second alternating current bus.
Through the technical scheme, the novel electric energy interaction system provided by the invention has the following advantages:
1. and the power supply reliability of uninterrupted load in the system is ensured to the maximum extent.
2. The sequential charging and discharging of the electric automobile, the energy storage battery and the like can be controlled and realized, and peak clipping and valley filling are realized.
3. Realizing the droop characteristic between each power supply.
4. And the electricity economy is realized through internal electric energy interaction.
5. The grid-connected operation mode and the off-grid operation mode of the system have stable operation strategies.
6. The alternating current and direct current systems of the system A and the system B can realize electric energy interaction and supply each other.
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 description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic structural diagram of a novel electric energy interaction system disclosed in an embodiment of the present invention;
fig. 2 is a schematic diagram of an operation state of the electric energy interactive system according to the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a novel electric energy interaction system, which has a structure shown in figure 1, and comprises a high-voltage switch, a distribution transformer, a low-voltage distribution and other traditional primary systems, an automobile charging and discharging system, an energy storage charging and discharging system, a photovoltaic power generation system, a wind power and other new energy systems, a power electronic power unit comprising a power conversion device and other power electronic power units, a communication system and other systems, wherein all the subsystems are completely integrated in an outdoor box-type shell, plug and play are realized, alternating current and direct current power supplies can be supplied mutually, and the power supply reliability is ensured to the maximum extent.
The system shown in fig. 1 includes a system a and a system B which are symmetrically distributed and have the same layout, the system a and the system B are connected to a power grid through a double-split transformer, the system a and the system B both include 3 sections of alternating current buses and 1 section of direct current buses, and switches AQF1 and BQF1 are arranged between the first alternating current buses of the system a and the system B and the double-split transformer, so that a power supply can be obtained from the power grid side, and voltage class conversion is performed through the double-split transformer.
The switches two AQFs 2 and BQF2 are respectively arranged between the first alternating current buses and the second alternating current buses of the A system and the B system, the switches three AQFs 3 and BQF3 are arranged between the second alternating current buses and the third alternating current buses, and the alternating current interconnection switch QF1 is arranged between the second alternating current buses of the A system and the B system, so that mutual supply and switching can be realized between the alternating current buses on two sides.
And the third alternating current bus is connected with the direct current bus, and an AC/DC converter is arranged between the third alternating current bus and the direct current bus. A direct current interconnection switch QF2 is arranged between the direct current buses of the system A and the system B, and mutual supply and switching can be realized between the direct current buses on two sides.
The first alternating current bus is connected with a plurality of alternating current loads, the second alternating current bus is connected with a plurality of uninterrupted loads, and the uninterrupted loads are high-grade loads and need uninterrupted power supply. The direct current bus is connected with an energy storage battery, a fan, a photovoltaic power generation device, an electric automobile and a direct current load. And DC/DC converters are respectively arranged among the energy storage battery, the fan, the electric automobile and the DC bus. An MPPT controller is arranged between the photovoltaic power generation device and the direct current bus. Direct current switches AD1 and BD1 are respectively arranged between the direct current loads of the system A and the system B and the direct current bus.
Alternating current switches A3, A4, A5, A6 … and B3, B4, B5 and B6 … are respectively arranged between the alternating current loads of the system A and the system B and the first alternating current bus, alternating current switches A1, A2 …, B1 and B2 … are respectively arranged between the uninterrupted loads of the system A and the system B and the second alternating current bus, and each load can be controlled independently.
When the system normally operates, a power supply is obtained from a power grid side, voltage grade conversion is carried out through the double-split transformer, switches AQF1, AQF2, AQF3, BQF1, BQF2 and BQF3 in the system are all in a closed state, all AC/DC and DC/DC in the system are bidirectional power electronic electric energy conversion units, the energy storage battery and the electric automobile are charged and discharged in order according to set time, all AC/DC loads preferentially utilize electric energy in the system to supply power, and when the electric energy is insufficient, electricity is taken from the power grid. If the photovoltaic power generation capacity and the battery discharge capacity in the system exceed the load power consumption, the power can be transmitted by the conventional power grid.
When a power grid system is powered off, the electric energy system can be quickly started in an off-grid running state, the AQF2 and the BQF2 switches can be cut off at the moment, switches A3-A6 and B3-B6 of non-important loads in the system are cut off, measures such as energy storage discharge and electric vehicle discharge are quickly started, and the AC/DC and DC/DC power electronic power conversion units ensure that a second alternating current bus of the A system and a second alternating current bus of the B system are in a power-on state, so that the power supply reliability of uninterrupted loads on the second alternating current bus is ensured.
Another important advantage of the electric energy interactive system is that interconnection switches are arranged between the alternating current bus and the direct current bus, when one side of the alternating current bus and the direct current bus have a fault, for example, a power grid is in a power failure state at the moment, AQF3 cannot be closed due to the fault, if no alternating current interconnection switch QF1 exists, an uninterrupted load of the system a can be in a power failure state, and at the moment, the alternating current interconnection switch QF1 can be closed to ensure the power supply reliability of the uninterrupted load. Meanwhile, the direct-current interconnection switch among the direct-current buses plays an important role, and when the direct-current electric energy of a certain surface is redundant or insufficient, the mutual supply of the electric energy can be realized by closing the direct-current interconnection switch QF 2.
The electric energy interactive system guarantees the power supply reliability of uninterrupted loads of the system A and the system B to the maximum extent, alternating current and direct current power supplies can be mutually supplied, and the electricity economy is realized more highly. And stable and smooth switching of the system is realized through a plurality of power electronic elements, and the droop characteristic is realized among the power supplies by applying the droop control principle.
The electric energy interaction system has 2 operation states, as shown in fig. 2:
grid-connected operation state:
the grid-connected operation state belongs to the long-term steady state of the system. When the system is in grid-connected operation, the system mainly aims to ensure that distributed power generation, energy storage and electric vehicle charging and discharging are scheduled, distributed power generation, system economic power utilization and peak-valley difference reduction are taken as comprehensive targets to be consumed to the maximum extent. In different application occasions, the priority level of each target may be different, and the intelligent power conversion equipment, the stable operation control device and the EMS strategy of the system should be capable of configuring the execution mode of the operation target through a configuration scheme.
An off-grid running state:
the off-grid running state belongs to the medium-long term stable state of a system, and is a main running state in an island micro-grid power supply project. During off-grid operation, the system mainly guarantees the planning design power supply duration target of important loads and other loads in the micro-grid system, and guarantees the continuous and stable transient power balance of the system and the energy guarantee under a large time scale through adjusting the energy storage device, the electric automobile, the distributed power supply and the loads with different importance levels.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A novel electric energy interaction system is characterized by comprising an A system and a B system which are symmetrically distributed and have the same layout, wherein the A system and the B system are connected with a power grid through a double-splitting transformer, the A system and the B system respectively comprise 3 sections of alternating current buses and 1 section of direct current buses, a first switch is arranged between the first alternating current bus and the double-splitting transformer, a second switch is arranged between the first alternating current bus and a second alternating current bus, a third switch is arranged between the second alternating current bus and a third alternating current bus, and an alternating current interconnection switch is arranged between the A system and the second alternating current bus of the B system; the third alternating current bus is connected with the direct current bus, and a direct current interconnection switch is arranged between the direct current buses of the system A and the system B; the first alternating current bus is connected with a plurality of alternating current loads, the second alternating current bus is connected with a plurality of uninterrupted loads, and the direct current bus is connected with an energy storage battery, a fan, a photovoltaic power generation device, an electric automobile and a direct current load.
2. The novel electric energy interaction system as claimed in claim 1, wherein an AC/DC converter is provided between the third AC bus and the DC bus.
3. The novel electric energy interaction system according to claim 1, wherein a DC/DC converter is respectively arranged between the energy storage battery, the fan, the electric vehicle and the DC bus.
4. The novel electric energy interaction system as claimed in claim 1, wherein an MPPT controller is provided between the photovoltaic power generation device and the dc bus.
5. The novel electric energy interaction system as claimed in claim 1, wherein a dc switch is provided between the dc load and the dc bus.
6. The novel power interactive system as claimed in claim 2 or 3, wherein the AC/DC converter and the DC/DC converter are both bidirectional power converters.
7. The novel electric energy interaction system as claimed in claim 1, wherein an ac switch is provided between the ac load and the first ac bus, and an ac switch is provided between the uninterruptible load and the second ac bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911111157.0A CN110829433A (en) | 2019-11-14 | 2019-11-14 | Novel electric energy interaction system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911111157.0A CN110829433A (en) | 2019-11-14 | 2019-11-14 | Novel electric energy interaction system |
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| CN110829433A true CN110829433A (en) | 2020-02-21 |
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| CN201911111157.0A Pending CN110829433A (en) | 2019-11-14 | 2019-11-14 | Novel electric energy interaction system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111231713A (en) * | 2020-03-27 | 2020-06-05 | 上海电气集团股份有限公司 | Electric automobile charging and discharging system and control method |
| CN111342450A (en) * | 2020-03-07 | 2020-06-26 | 西南交通大学 | Robust energy management method considering uncertain photovoltaic and load for traction power supply system |
| CN113890007A (en) * | 2020-07-02 | 2022-01-04 | 中国移动通信集团设计院有限公司 | Prepackage type power supply and distribution system |
| WO2022145353A1 (en) * | 2021-01-04 | 2022-07-07 | 国立大学法人東北大学 | Power system |
| WO2023111338A1 (en) * | 2021-12-17 | 2023-06-22 | Torqeedo Gmbh | Transformer for a watercraft, energy distribution system for a watercraft, and watercraft |
-
2019
- 2019-11-14 CN CN201911111157.0A patent/CN110829433A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342450A (en) * | 2020-03-07 | 2020-06-26 | 西南交通大学 | Robust energy management method considering uncertain photovoltaic and load for traction power supply system |
| CN111342450B (en) * | 2020-03-07 | 2022-08-23 | 西南交通大学 | Robust energy management method considering uncertain photovoltaic and load for traction power supply system |
| CN111231713A (en) * | 2020-03-27 | 2020-06-05 | 上海电气集团股份有限公司 | Electric automobile charging and discharging system and control method |
| CN113890007A (en) * | 2020-07-02 | 2022-01-04 | 中国移动通信集团设计院有限公司 | Prepackage type power supply and distribution system |
| CN113890007B (en) * | 2020-07-02 | 2023-11-21 | 中国移动通信集团设计院有限公司 | Preassembled power supply and distribution system |
| WO2022145353A1 (en) * | 2021-01-04 | 2022-07-07 | 国立大学法人東北大学 | Power system |
| WO2023111338A1 (en) * | 2021-12-17 | 2023-06-22 | Torqeedo Gmbh | Transformer for a watercraft, energy distribution system for a watercraft, and watercraft |
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Effective date of registration: 20211210 Address after: Room 1001, 10th floor, no.336, Songling Road, Laoshan District, Qingdao City, Shandong Province 266000 Applicant after: Qingdao teltel New Energy Technology Co.,Ltd. Address before: No.1, Shangde Avenue, Jiaozhou economic and Technological Development Zone, Qingdao, Shandong 266300 Applicant before: QINGDAO TGOOD HIGH PRESSURE EQUIPMENT Co.,Ltd. |
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