CN103580264A - Direct current micro-grid system supplying power in looped network mode - Google Patents
Direct current micro-grid system supplying power in looped network mode Download PDFInfo
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- CN103580264A CN103580264A CN201310508459.8A CN201310508459A CN103580264A CN 103580264 A CN103580264 A CN 103580264A CN 201310508459 A CN201310508459 A CN 201310508459A CN 103580264 A CN103580264 A CN 103580264A
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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Abstract
The invention provides a direct current micro-grid system supplying power in a looped network mode. The direct current micro-grid system supplying the power in the looped network mode comprises looped-network-shaped direct current buses with different voltage levels, a mixed current circuit breaker connected between bus sections, a photovoltaic power generation system, an energy storage power source, an internal-combustion engine, a convertor, direct current loads and alternating current loads, wherein the photovoltaic power generation system, the energy storage power source, the internal-combustion engine, the convertor, the direct current loads and the alternating current loads are connected to the direct current buses. The energy storage power source and the photovoltaic power generation system are connected with the looped-network-shaped direct current buses with the different voltage levels through the convertor. The mixed current circuit breaker acts when a fault point occurs to a certain section line of the direct current buses, and a solid-state switch of the mixed current circuit breaker breaks the fault point. The internal-combustion engine is connected with the looped-network-shaped direct current buses with the different voltage levels through the convertor, and provides backup power for the direct current loads and the alternating current loads of the direct current micro-grid system when the mixed current circuit breaker acts. According to the direct current micro-grid system supplying power in the looped network mode, when faults occur to a certain part of lines, the mixed current circuit breaker acts timely to isolate the fault part, and a large-area power outage accident is avoided.
Description
Technical field
The present invention relates to power technology field, relate in particular to a kind of direct current micro-grid system with the power supply of looped network form.
Background technology
Microgrid refers to by distributed power source, energy storage device, energy converter, relevant load and monitoring, protective device and collects the small-sized electric system of being transported to forming; be one and can realize the autonomous system that oneself controls, protects and manage; both can be incorporated into the power networks with large electrical network, also can island mode operation.
At present, microgrid is mainly that the form that exchanges microgrid exists.With exchange microgrid and compare, direct current microgrid does not need the phase place of voltage and frequency to follow the tracks of, reliability improves, thereby is more applicable to the access of DER and load.In theory, direct current microgrid only needs being just connected of realization and DER and load easily of one-level current transformer, has higher transformation efficiency; Direct current does not need to consider the eddy current loss of distribution line and the quadergy that circuit absorbs in transmitting procedure simultaneously, and line loss is reduced.But direct current microgrid electric power system will cause whole piece circuit to be stopped power supply when a circuit part breaks down, and power supply reliability is low.
In microgrid, usually adopt solar energy, wind energy, the energy storage distributed energy to generate electricity as power supply, in these electricity generation systems, solar power generation and energy storage are directly to produce direct current energy, although wind power generation is AC energy from the output of generator port, need to be rectified into direct current energy.These direct current energies need to be converted to AC energy by inverter, just can be for load.And in present a lot of power consumption equipments, first AC energy is become to direct current energy, then direct current energy is further processed.Visible, take distributed energy generating in main micro-grid system, the intermediate link of some AC-DC conversion can be saved.
The Chinese patent that denomination of invention is " a kind of three-wire system direct current micro-grid system and control method thereof that is applicable to modern building " discloses a kind of direct current micro-grid system structure, specifically as shown in Figure 1:
This direct current micro-grid system comprises a DC three-wire system distribution line, a diesel engine generator, at least one is with the photovoltaic power generation apparatus of corresponding DC/DC current transformer, one group of energy storage battery and corresponding DC/DC current transformer thereof, at least one is with the DC/DC current transformer of respective straight current load, at least one is with the DC/AC inverter of corresponding single phase industrial frequence AC load, one with the adjustable DC/AC inverter of the frequency amplitude of respective three-phase AC load, the three-phase AC/DC rectification/inverter of a large electrical network of access, a balance of voltage device, a microgrid control system.
In the disclosed direct current micro-grid system of prior art, system works nominal rating voltage is 750V, and adopts bavin outbreak for power backup.This higher grade of system voltage, when powering to DC load, need to convert through multiple energy, and when a certain circuit breaks down, can not guarantee the normal power supply of load, and bavin is sent out run duration in addition, and this system can cause certain environmental pollution.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of direct current micro-grid system with the power supply of looped network form, comprise: the looped network shape DC bus of different electric pressures, be connected to the hybrid electric current circuit breaker between the bus section, busbar section of described looped network shape DC bus, and be connected to photovoltaic generating system, accumulation power supply, internal combustion engine, converter, DC load, the AC load on this looped network shape DC bus;
Described accumulation power supply is connected from the looped network shape DC bus of described different electric pressures by described converter respectively with photovoltaic generating system, is described direct current micro-grid system power supply;
The action when a certain section of circuit of described looped network shape DC bus breaks down of described mixing type current-limiting circuit breaker, by its solid-state switch disjunction fault point;
Described internal combustion engine is connected by the looped network shape DC bus of described converter and described different electric pressures, when described mixing type current-limiting circuit breaker action, for DC load and the AC load of described direct current micro-grid system provides stand-by power supply.
Wherein, described converter comprises: three-phase DC/AC converter, two-way AC/DC converter, two-way DC/DC converter, unidirectional DC/DC converter, unidirectional DC/AC converter, unidirectional AC/DC converter;
Described photovoltaic generating system is connected with described looped network shape DC bus by described unidirectional DC/DC converter;
Described accumulation power supply is connected with described looped network shape DC bus by described two-way DC/DC converter;
Described internal combustion engine is connected with described looped network shape DC bus by described two-way AC/DC converter and/or unidirectional AC/DC converter.
Wherein, described DC load is two groups, and every group has respectively two DC load, and each DC load is connected from the looped network shape DC bus of described different electric pressures by unidirectional DC/DC converter.
Wherein, described AC load comprises three-phase alternating current load and single phase industrial frequence AC load; Described three-phase alternating current load is connected with described looped network shape DC bus by described three-phase DC/AC converter; Described single phase industrial frequence AC load is connected with described looped network shape DC bus by described unidirectional DC/AC converter.
Wherein, the electric pressure of described looped network shape DC bus is respectively 240V and 480V.
Wherein, described direct current micro-grid system also comprises the EMS being connected with described two-way DC/DC converter with described unidirectional DC/DC converter.
Wherein, described accumulation power supply is storage battery.
Implement the present invention, this direct current micro-grid system is powered with looped network form, system has been considered current most DC load need for electricity, reasonable distribution power load, and break down when a circuit part, mixing type current-limiting circuit breaker moves isolated fault position in time, avoids large area blackout, General Promotion electricity consumption reliability, versatility is stronger.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is direct current micro-grid system schematic diagram in prior art;
Fig. 2 is the schematic diagram of the direct current micro-grid system embodiment mono-with the power supply of looped network form provided by the invention;
Fig. 3 is the schematic diagram of the direct current micro-grid system embodiment bis-with the power supply of looped network form provided by the invention.
Embodiment
In direct current micro-grid system with the power supply of looped network form provided by the invention, the be set as ± 240V of nominal rating voltage of DC micro power grid system.In DC micro power grid system structure, large electrical network, photovoltaic, accumulation power supply are as electric power system, wherein when the energy output of system photovoltaic in service can meet workload demand completely, energy storage is also charged to energy storage by photovoltaic as a part for load, and internal combustion engine is as stand-by power supply, when large electric network fault or workload demand are opened internal combustion engine compensate for residual electric loading when larger.The DC load of different electric pressures is provided by unidirectional DC/DC, by AC/DC, provides family expenses 220V AC single phase load electricity consumption.
Concrete, refer to Fig. 2, for the invention provides a kind of direct current micro-grid system with the power supply of looped network form, it comprises: the looped network shape DC bus of different electric pressures, be connected to the hybrid electric current circuit breaker between the bus section, busbar section of described looped network shape DC bus, and be connected to photovoltaic generating system, accumulation power supply, internal combustion engine, converter, DC load, the AC load on this looped network shape DC bus;
Described accumulation power supply is connected from the looped network shape DC bus of described different electric pressures by described converter respectively with photovoltaic generating system, is described direct current micro-grid system power supply;
The action when a certain section of circuit of described looped network shape DC bus breaks down of described mixing type current-limiting circuit breaker, by its solid-state switch disjunction fault point;
Described internal combustion engine is connected by the looped network shape DC bus of described converter and described different electric pressures, when described mixing type current-limiting circuit breaker action, for DC load and the AC load of described direct current micro-grid system provides stand-by power supply.
In concrete realization, described converter comprises: three-phase DC/AC converter, two-way AC/DC converter, two-way DC/DC converter, unidirectional DC/DC converter, unidirectional DC/AC converter, unidirectional AC/DC converter;
Described photovoltaic generating system is connected with described looped network shape DC bus by described unidirectional DC/DC converter;
Described accumulation power supply is connected with described looped network shape DC bus by described two-way DC/DC converter;
Described internal combustion engine is connected with described looped network shape DC bus by described two-way AC/DC converter and/or unidirectional AC/DC converter.
Wherein, described DC load is two groups, and every group has respectively two DC load, and each DC load is connected from the looped network shape DC bus of described different electric pressures by unidirectional DC/DC converter.
Wherein, described AC load comprises three-phase alternating current load and single phase industrial frequence AC load; Described three-phase alternating current load is connected with described looped network shape DC bus by described three-phase DC/AC converter; Described single phase industrial frequence AC load is connected with described looped network shape DC bus by described unidirectional DC/AC converter.
Wherein, the electric pressure of described looped network shape DC bus is respectively 240V and 480V.
As shown in Figure 3, described direct current micro-grid system also comprises the EMS being connected with described two-way DC/DC converter with described unidirectional DC/DC converter.
The present invention proposes ± 240V direct current micro-grid system structure.This system is compared existing direct current micro-grid system, system in the present invention is powered with looped network form, and using the stand-by power supply of internal combustion engine as system, when a certain circuit breaks down, mixing type current-limiting circuit breaker moves rapidly, by solid-state switch disjunction fault point, starting apparatus combustion engine when electric power system can not meet workload demand completely, guarantees the normal power supply of load.System configuration in the present invention is simple, and operational efficiency is high, and power supply reliability is high.In addition, the pure use regenerative resource of direct current micro-grid system in the present invention and energy-storage system and internal combustion engine carry out energy supply, have also reduced environmental pollution when having saved primary energy, are applicable to the development construction demand of following related system.
It should be noted that; what the present invention described is a kind of product form of direct current micro-grid system; other meets the product of structure of the present invention, even if material, device name, outward appearance, device are put order etc., not affect the factor of product performance not identical, still belongs to the scope of protection of the invention.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. the direct current micro-grid system with looped network form power supply, it is characterized in that, comprise: the looped network shape DC bus of different electric pressures, be connected to the hybrid electric current circuit breaker between the bus section, busbar section of described looped network shape DC bus, and be connected to photovoltaic generating system, accumulation power supply, internal combustion engine, converter, DC load, the AC load on this looped network shape DC bus;
Described accumulation power supply is connected from the looped network shape DC bus of described different electric pressures by described converter respectively with photovoltaic generating system, is described direct current micro-grid system power supply;
The action when a certain section of circuit of described looped network shape DC bus breaks down of described mixing type current-limiting circuit breaker, by its solid-state switch disjunction fault point;
Described internal combustion engine is connected by the looped network shape DC bus of described converter and described different electric pressures, when described mixing type current-limiting circuit breaker action, for DC load and the AC load of described direct current micro-grid system provides stand-by power supply.
2. the direct current micro-grid system with looped network form power supply as claimed in claim 1, it is characterized in that, described converter comprises: three-phase DC/AC converter, two-way AC/DC converter, two-way DC/DC converter, unidirectional DC/DC converter, unidirectional DC/AC converter, unidirectional AC/DC converter;
Described photovoltaic generating system is connected with described looped network shape DC bus by described unidirectional DC/DC converter;
Described accumulation power supply is connected with described looped network shape DC bus by described two-way DC/DC converter;
Described internal combustion engine is connected with described looped network shape DC bus by described two-way AC/DC converter and/or unidirectional AC/DC converter.
3. the direct current micro-grid system with looped network form power supply as claimed in claim 2, it is characterized in that, described DC load is two groups, and every group has respectively two DC load, and each DC load is connected from the looped network shape DC bus of described different electric pressures by unidirectional DC/DC converter.
4. the direct current micro-grid system with the power supply of looped network form as claimed in claim 2, is characterized in that, described AC load comprises three-phase alternating current load and single phase industrial frequence AC load; Described three-phase alternating current load is connected with described looped network shape DC bus by described three-phase DC/AC converter; Described single phase industrial frequence AC load is connected with described looped network shape DC bus by described unidirectional DC/AC converter.
5. the direct current micro-grid system with the power supply of looped network form as described in claim 3 or 4, is characterized in that, the electric pressure of described looped network shape DC bus is respectively 240V and 480V.
6. the direct current micro-grid system with the power supply of looped network form as claimed in claim 5, is characterized in that, described direct current micro-grid system also comprises the EMS being connected with described two-way DC/DC converter with described unidirectional DC/DC converter.
7. the direct current micro-grid system with the power supply of looped network form as claimed in claim 6, is characterized in that, described accumulation power supply is storage battery.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218796A (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | Novel busbar-free four-port bipolar DC-DC (direct current to direct current) converter |
| CN105762921A (en) * | 2016-01-27 | 2016-07-13 | 江苏省电力公司南京供电公司 | Superconducting fault current limiter-based loop closing switching power supply method |
| CN106374533A (en) * | 2016-10-28 | 2017-02-01 | 西安特锐德智能充电科技有限公司 | Micro energy network system |
| CN109038539A (en) * | 2017-06-09 | 2018-12-18 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of alternating current-direct current mixing micro-capacitance sensor topology design method based on energy router |
| CN109245087A (en) * | 2018-10-12 | 2019-01-18 | 珠海格力电器股份有限公司 | A kind of DC power-supply system |
| CN109301824A (en) * | 2018-11-15 | 2019-02-01 | 紫光测控有限公司 | Zero based on the support of double path system power supply disturbs flexible distribution system |
| CN113014196A (en) * | 2021-03-12 | 2021-06-22 | 中国电子科技集团公司第十八研究所 | Unmanned aerial vehicle energy management system topological structure |
| CN113872232A (en) * | 2021-10-20 | 2021-12-31 | 广东电网有限责任公司 | Direct current distribution network topological structure of data center |
| CN114342210A (en) * | 2019-09-12 | 2022-04-12 | Abb瑞士股份有限公司 | Uninterruptible Power Supply (UPS) for connecting multiphase load to Alternating Current (AC) power source and Direct Current (DC) power source |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218796B (en) * | 2014-07-25 | 2017-09-01 | 国家电网公司 | One kind is without the bipolar DC DC converters in the port of bus four |
| CN104218796A (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | Novel busbar-free four-port bipolar DC-DC (direct current to direct current) converter |
| CN105762921A (en) * | 2016-01-27 | 2016-07-13 | 江苏省电力公司南京供电公司 | Superconducting fault current limiter-based loop closing switching power supply method |
| CN106374533B (en) * | 2016-10-28 | 2024-04-30 | 西安特来电智能充电科技有限公司 | Miniature energy network system |
| CN106374533A (en) * | 2016-10-28 | 2017-02-01 | 西安特锐德智能充电科技有限公司 | Micro energy network system |
| CN109038539A (en) * | 2017-06-09 | 2018-12-18 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of alternating current-direct current mixing micro-capacitance sensor topology design method based on energy router |
| CN109245087A (en) * | 2018-10-12 | 2019-01-18 | 珠海格力电器股份有限公司 | A kind of DC power-supply system |
| CN109301824A (en) * | 2018-11-15 | 2019-02-01 | 紫光测控有限公司 | Zero based on the support of double path system power supply disturbs flexible distribution system |
| CN114342210A (en) * | 2019-09-12 | 2022-04-12 | Abb瑞士股份有限公司 | Uninterruptible Power Supply (UPS) for connecting multiphase load to Alternating Current (AC) power source and Direct Current (DC) power source |
| CN114342210B (en) * | 2019-09-12 | 2024-04-16 | Abb瑞士股份有限公司 | Uninterruptible Power Supply (UPS) for connecting multiphase loads to AC power source and DC power source |
| CN113014196A (en) * | 2021-03-12 | 2021-06-22 | 中国电子科技集团公司第十八研究所 | Unmanned aerial vehicle energy management system topological structure |
| CN113872232A (en) * | 2021-10-20 | 2021-12-31 | 广东电网有限责任公司 | Direct current distribution network topological structure of data center |
| CN113872232B (en) * | 2021-10-20 | 2024-04-19 | 广东电网有限责任公司 | DC power distribution network topological structure of data center |
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