CN112909914A - Intelligent direct-current micro-grid system suitable for building comprehensive energy supply station - Google Patents

Intelligent direct-current micro-grid system suitable for building comprehensive energy supply station Download PDF

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Publication number
CN112909914A
CN112909914A CN202110235380.7A CN202110235380A CN112909914A CN 112909914 A CN112909914 A CN 112909914A CN 202110235380 A CN202110235380 A CN 202110235380A CN 112909914 A CN112909914 A CN 112909914A
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direct current
direct
converter
breaker
current
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CN202110235380.7A
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Inventor
马聪
林俊光
董益华
张浙波
张曦
俞李斌
赵申轶
叶飞宇
魏山力
刘刚
胡旭辉
蒋月红
毛阗
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Zhejiang Energy Group Research Institute Co Ltd
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Zhejiang Energy Group Research Institute Co Ltd
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Priority to CN202110235380.7A priority Critical patent/CN112909914A/en
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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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/06—Two-wire systems
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/02—Arrangements for reducing harmonics or ripples
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
    • 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
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • 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
    • 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
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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]
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to an intelligent direct current micro-grid system suitable for a building comprehensive energy supply station, which comprises: the system comprises a photovoltaic integrated system, a micro wind power generation system, an electric energy storage system, a mains supply transformer, a direct current bus, a voltage balancer, a direct current lighting A, a direct current lighting B, an intelligent energy scheduling management and fault monitoring system, an exhaust fan, a direct current charging pile A, a direct current charging pile B, UPS direct current power supply, a plurality of DC/DC converters, a plurality of AC/DC converters, a plurality of alternating current circuit breakers and a plurality of direct current circuit breakers. The invention has the beneficial effects that: the intelligent direct-current micro-grid system provided by the invention is used for reducing the impact faced when the distributed renewable energy sources are accessed, improving the use proportion and the distributed power generation permeability of the renewable energy sources in the building, and simultaneously improving the power supply reliability of the comprehensive energy supply station of the building, and has good demonstration significance.

Description

Intelligent direct-current micro-grid system suitable for building comprehensive energy supply station
Technical Field
The invention belongs to the technical field of electricity, and particularly relates to an intelligent direct-current micro-grid system suitable for a building comprehensive energy supply station.
Background
The distributed energy mainly based on photovoltaic power generation and wind power generation has the advantages of being green, low-carbon, efficient, energy-saving, convenient to install and the like, facilitates popularization of green energy, and is renewable energy with wide application prospect. However, with the development of power distribution systems, the disadvantages of the ac microgrid, such as a large number of conversion links, large energy loss, complex control modes, etc., become more and more prominent. Compared with an alternating-current micro-grid, the direct-current micro-grid reduces the number of current conversion times, reduces the number of power electronic current converters, and reduces the system construction, operation and maintenance cost. From the energy supply side, the photovoltaic power generation, the wind power generation and the electricity storage have direct current links, the direct current distribution can save the inversion link, the power transmission efficiency is higher, in addition, the direct current grid connection has no limitation of frequency, power factors, phase and the like, the distributed power supply is convenient to access, and the coordination control among the distributed power supplies is easy to realize; in the energy transmission link, direct current distribution has no circulation and line capacitance, the line loss is lower, and the transmission power is higher on the premise of the same cable section and quantity; seen from the energy demand side, direct current power consumption load proportion such as direct current charging pile, direct current illumination increases in the building body, and direct current power supply is directly adopted, so that the working efficiency is improved, and the greater economic advantage is highlighted, and therefore the wide application prospect is achieved.
At present, research results aiming at the aspects of the topological structure, the power electronic conversion interface, the optimal scheduling, the control strategy, the energy management and the like of the direct-current micro-grid are endless, and the research of the direct-current micro-grid gradually becomes a research hotspot in academic circles and industrial circles. With the diversification of the topology structure of the direct current microgrid, the superiority of the power transmission of the direct current microgrid is more and more obvious. The direct-current micro-grid is presented to people in the form of diversified structures, and the direct-current micro-grid is developed from a single bus structure into a direct-current micro-grid group form characterized by multilevel and multi-modularization.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an intelligent direct-current micro-grid system suitable for a building comprehensive energy supply station.
This kind of wisdom direct current microgrid system suitable for building is synthesized and is supplied energy station includes: the system comprises a photovoltaic integrated system, a micro wind power generation system, an electric energy storage system, a mains supply transformer, a direct current bus, a voltage balancer, a direct current lighting A, a direct current lighting B, an intelligent energy scheduling management and fault monitoring system, an exhaust fan, a direct current charging pile A, a direct current charging pile B, UPS direct current power supply, a plurality of DC/DC converters, a plurality of AC circuit breakers and a plurality of DC circuit breakers; the voltage balancer is adopted to inhibit the fluctuation of the positive and negative direct currents in the bipolar direct current micro-grid to the neutral line voltage, the bipolar three-wire system direct current micro-grid introduced into the voltage balancer can effectively improve the dynamic performance and the anti-interference capability of the system for controlling the direct current voltage balance, and the power supply reliability of the bipolar direct current micro-grid is improved; the photovoltaic integrated system, the miniature wind power generation system, the electric energy storage system, the commercial power transformer, the voltage balancer, the direct-current lighting A, the direct-current lighting B, the intelligent energy scheduling management and fault monitoring system, the exhaust fan, the direct-current charging pile A and the direct-current charging pile B, UPS are all connected to a direct-current bus.
Preferably, the integrated photovoltaic system comprises a cadmium telluride thin film solar cell and a DC/DC converter A, wherein the cadmium telluride thin film solar cell is electrically connected with the DC/DC converter A;
the micro wind power generation system comprises a micro wind power generator and an AC/DC converter C, wherein an alternating current breaker C is arranged on a connecting line between the micro wind power generator and the AC/DC converter C;
the electric energy storage system comprises an energy storage battery A, an energy storage battery B, a super capacitor, a DC/DC converter B, DC/DC converter D and a DC/DC converter E; the super capacitor is electrically connected with the DC/DC converter B, and the DC/DC converter B is divided into two paths and is respectively connected with the seventh direct current breaker and the eighth direct current breaker and then is sequentially connected with the positive electrode of the direct current bus and the negative electrode of the direct current bus; the energy storage battery A is electrically connected with the DC/DC converter D, and the DC/DC converter D is divided into two paths and is respectively connected with the eleventh direct current breaker and the twelfth direct current breaker and then sequentially connected with the positive electrode of the direct current bus and the direct current neutral wire; the energy storage battery B is electrically connected with a DC/DC converter E, and the DC/DC converter E is divided into two paths and is respectively connected with a thirteenth direct current breaker and a fourteenth direct current breaker and then sequentially connected with a direct current bus cathode and a direct current neutral wire; the super capacitor has a good power characteristic, when a direct current charging pile in the system is used, the peak value of load current in the system is high but the duration is short, and at the moment, the super capacitor releases energy through the intelligent energy scheduling management system, so that the voltage stability of a direct current bus is maintained, and the running economy of a direct current micro-grid system is improved;
after being connected through a mains transformer, the mains supply is divided into two paths which are respectively connected into an AC/DC converter A and an AC/DC converter B; an alternating current circuit breaker E is arranged on a connecting line between commercial power and one end of a commercial power transformer, an alternating current circuit breaker D is arranged at the other end of the commercial power transformer, a line behind the alternating current circuit breaker D is divided into two lines to be respectively connected with an alternating current circuit breaker A and an alternating current circuit breaker B, the alternating current circuit breaker A is connected into an AC/DC converter A, and the alternating current circuit breaker B is connected into an AC/DC converter B; the AC/DC converter A is connected to the positive pole of the direct current bus and the direct current neutral wire; the AC/DC converter B is connected to the negative electrode of the direct current bus and the direct current neutral wire;
the direct current bus is divided into three lines, namely a direct current bus positive pole, a direct current neutral line and a direct current bus negative pole; the voltage balancer is divided into three paths which are respectively connected with the direct current fuse A, the direct current fuse B and the direct current fuse C and then sequentially connected with the positive pole of the direct current bus, the direct current neutral line and the negative pole of the direct current bus;
the two ends of the direct-current lighting A are electrically connected with a DC/DC converter C, and the DC/DC converter C is divided into two paths and is respectively connected with a ninth direct-current breaker and a tenth direct-current breaker and then sequentially connected with the positive electrode of the direct-current bus and the direct-current neutral wire; two ends of the direct current lighting B are electrically connected with a DC/DC converter F, and the DC/DC converter F is divided into two paths and is respectively connected with a fifteenth direct current breaker and a sixteenth direct current breaker and then is sequentially connected with a direct current bus cathode and a direct current neutral wire;
the intelligent energy dispatching management and fault monitoring system is electrically connected with the AC/DC converter A, AC/DC converter B, DC/DC converter A, AC/DC converter C, a first direct-current breaker, a second direct-current breaker, a third direct-current breaker, a fourth direct-current breaker, a fifth direct-current breaker, a sixth direct-current breaker, a direct-current bus anode, a direct-current neutral wire, a direct-current bus cathode, a seventh direct-current breaker, an eighth direct-current breaker, a ninth direct-current breaker, a tenth direct-current breaker, an eleventh direct-current breaker, a twelfth direct-current breaker, a thirteenth direct-current breaker, a fourteenth direct-current breaker, a fifteenth direct-current breaker, a sixteenth direct-current breaker, a seventeenth direct-current breaker, an eighteenth direct-current breaker, a nineteenth direct-current breaker, a twentieth direct-current breaker, a twenty-first direct-current breaker, A twenty-second direct current breaker, a twenty-third direct current breaker, a twenty-fourth direct current breaker, a DC/DC converter B, DC/DC converter C, DC/DC converter D, DC/DC converter E, DC/DC converter F, DC/DC converter G, a direct current fuse A, a direct current fuse B, a direct current fuse C, DC/DC converter H, a voltage balancer, a direct current charging pile A and a direct current charging pile B;
the air exhaust fan is electrically connected with a DC/DC converter G, and the DC/DC converter G is divided into two paths and is respectively connected with a seventeenth direct current breaker and an eighteenth direct current breaker and then is sequentially connected with a positive electrode of a direct current bus and a negative electrode of the direct current bus;
the two ends of the direct current charging pile A are respectively and electrically connected with a nineteenth direct current breaker and a twentieth direct current breaker and then are sequentially connected with a direct current bus positive pole and a direct current bus negative pole; two ends of the direct current charging pile B are respectively and electrically connected with a twenty-first direct current breaker and a twenty-second direct current breaker and then are sequentially connected to a direct current bus positive pole and a direct current bus negative pole;
two ends of the UPS are electrically connected with a DC/DC converter H, and the DC/DC converter H is divided into two paths and is respectively connected with a twenty-third direct current breaker and a twenty-fourth direct current breaker and then sequentially connected to a direct current bus positive electrode and a direct current bus negative electrode.
Preferably, the AC/DC converter and the DC/DC converter are energy-saving converters adopting a zero-voltage zero-current soft switching technology so as to improve the operation efficiency of the whole direct-current micro-grid system; the direct current breaker adopts the solid-state direct current breaker based on the IGBT technology, has high breaking speed, can realize quick isolation of fault elements in the direct current micro-grid system, enables the system to be more reliable and efficient, and can reduce the maintenance cost of the system at the same time.
Preferably, the smart direct current micro-grid system suitable for the building comprehensive energy supply station comprises: the system comprises at least one photovoltaic integrated system with a DC/DC converter, at least one miniature wind power generation system with an AC/DC converter, at least one super capacitor with the DC/DC converter, at least one direct current charging pile, at least one direct current lighting with the DC/DC converter, at least one UPS direct current power supply with the DC/DC converter, at least one exhaust fan with the DC/DC converter and an intelligent energy scheduling management and fault monitoring system.
Preferably, the direct current bus is a bipolar three-wire direct current bus, the voltage level of the positive electrode of the direct current bus is DC +375V, the voltage level of the negative electrode of the direct current bus is DC-375V, and the voltage level of the direct current neutral line is zero.
Preferably, the direct current fuse A, the direct current fuse B and the direct current fuse C are isolatable or replaceable devices; when the voltage balancer breaks down, the direct current fuse A, the direct current fuse B and the direct current fuse C are isolated or replaced, and the safety of system operation is improved.
Preferably, the energy storage batteries A and B are novel water-based zinc ion batteries, and the water-based zinc ion batteries have the advantages of high safety, environmental friendliness, low cost, good cyclicity, long service life, simplicity in operation and maintenance and the like. Compared with the pollution of heavy metal lead and electrolyte solution of lead-acid storage batteries to the environment, the raw materials used by the water system zinc ion battery and the reaction products of charging and discharging are nontoxic and harmless. Compared with protection requirements such as heat dissipation, overcharge and overdischarge of the lithium ion battery and potential safety performance hazards, the water system zinc ion battery has no risks of explosion and fire under the conditions of overcharge, charge and discharge and short circuit, has high safety similar to a lead-acid battery, and is suitable for large-scale static power energy storage in a building; the capacity of the energy storage battery A, the capacity of the energy storage battery B and the capacity of the super capacitor are comprehensively evaluated and optimally configured according to the capacity of the cadmium telluride thin-film solar cell, the capacity of the miniature wind driven generator, the power of the direct-current illumination A, the power of the direct-current illumination B, the number of the direct-current charging piles A and the number of the direct-current charging piles B, and the basic balance of overall power supply and demand and the operation economy are met.
Preferably, the intelligent energy dispatching management and fault monitoring system is connected with each monitoring control device communication interface through a bus or a hard wire; the intelligent energy scheduling management and fault monitoring system is connected with each monitoring device through hard wiring, so that the display, management and energy optimization coordination control distribution and fault monitoring diagnosis of the whole direct current micro-grid system are realized;
the monitoring control apparatus includes: DC/DC converter A, DC/DC converter B, DC/DC converter C, DC/DC converter D, DC/DC converter E, DC/DC converter F, DC/DC converter G, DC/DC converter H, AC/DC converter A, AC/DC converter B, AC/DC converter C, DC charging pile A, DC charging pile B, AC circuit breaker A, AC circuit breaker B, AC circuit breaker C, AC circuit breaker D, AC circuit breaker E, first DC circuit breaker, second DC circuit breaker, third DC circuit breaker, fourth DC circuit breaker, fifth DC circuit breaker, sixth DC circuit breaker, seventh DC circuit breaker, eighth DC circuit breaker, ninth DC circuit breaker, tenth DC circuit breaker, eleventh DC circuit breaker, twelfth DC circuit breaker, ninth DC circuit breaker, sixth DC circuit breaker, seventh DC circuit breaker, ninth DC circuit breaker, tenth DC, A thirteenth direct current breaker, a fourteenth direct current breaker, a fifteenth direct current breaker, a sixteenth direct current breaker, a seventeenth direct current breaker, an eighteenth direct current breaker, a nineteenth direct current breaker, a twentieth direct current breaker, a twenty-first direct current breaker, a twenty-second direct current breaker, a twenty-third direct current breaker, and a twenty-fourth direct current breaker;
the monitoring device includes: the voltage balancer, the positive pole of direct current bus, direct current neutral conductor and direct current bus negative pole.
According to the working method of the intelligent direct current micro-grid system suitable for the building comprehensive energy supply station, the intelligent direct current micro-grid system is switched and operated among a grid-connected mode, an island mode and an emergency mode;
when the intelligent direct-current micro-grid system operates in a grid-connected mode: the intelligent direct-current micro-grid system is connected with a mains supply, and when the total load in the intelligent direct-current micro-grid system is larger than the total generated power of the distributed renewable energy sources, the AC/DC converter A and the AC/DC converter B at the lower end of a mains supply transformer supply power to the direct-current bus; when the total power generation power of the distributed renewable energy sources is larger than the total load in the intelligent direct-current micro-grid system, the AC/DC converter A and the AC/DC converter B at the lower end of the commercial power transformer supply power to the commercial power;
when the intelligent direct current micro-grid system operates in an island mode: the intelligent energy scheduling management and fault monitoring system optimizes, coordinates and controls the distributed renewable energy sources, the energy storage battery A, the energy storage battery B, the super capacitor, the direct-current lighting A and the direct-current lighting B, so that the total power generation power in the intelligent direct-current micro-grid system is balanced with the total load in the intelligent direct-current micro-grid system, the utilization rate of the distributed renewable energy sources is improved to the maximum extent, and the power supply reliability is guaranteed;
when the intelligent direct-current micro-grid system operates in an emergency mode: when the direct current bus supplies power to the UPS direct current power supply after voltage is converted by the DC/DC converter H, if the intelligent direct current micro-grid system fails or is in a maintenance state and the distributed renewable energy output cannot meet the power utilization requirement in the intelligent direct current micro-grid system, cutting off direct current power utilization loads, and storing electric energy to the maximum extent in advance, wherein the direct current power utilization loads comprise a direct current charging pile A and a direct current charging pile B; the emergency use of the UPS is met, and the power utilization requirement of the UPS for important loads such as cooling water pump motors in the comprehensive energy supply station is met.
The invention has the beneficial effects that:
the intelligent direct-current micro-grid system is used for reducing the impact faced when the distributed renewable energy sources are accessed, improving the use proportion and the distributed power generation permeability of the renewable energy sources in the building, improving the power supply reliability of a comprehensive energy supply station of the building and having good demonstration significance;
the voltage balancer is adopted to inhibit the fluctuation of the positive and negative direct currents in the bipolar direct current micro-grid to the neutral line voltage, the bipolar three-wire system direct current micro-grid introduced into the voltage balancer can effectively improve the dynamic performance and the anti-interference capability of the system for controlling the direct current voltage balance, and the power supply reliability of the bipolar direct current micro-grid is improved;
the system adopts an energy scheduling management and fault monitoring system to control the operation of the whole direct current micro-grid system, performs data acquisition and control on direct current loads such as distributed renewable energy sources, an energy storage system, a lighting system and the like and power electronic devices such as a converter and the like, adopts multi-energy flow cooperative management to realize real-time intelligent scheduling and fault monitoring of energy tide in the system, realizes a source-grid-load-storage-regulation integrated technology, and improves the comprehensive utilization efficiency and the operation economy of green renewable energy sources;
drawings
Fig. 1 is an electrical topology structure diagram of the present invention.
Description of reference numerals: cadmium telluride thin-film solar cell 1, a micro wind driven generator 2, a commercial power transformer 3, a DC/DC converter A4, a DC/DC converter B5, a DC/DC converter C6, a DC/DC converter D7, a DC/DC converter E8, a DC/DC converter F9, a DC/DC converter G10, a DC/DC converter H11, an AC/DC converter A12, an AC/DC converter B13, an AC/DC converter C14, a voltage balancer 15, a super capacitor 16, direct current lighting A17, direct current lighting B20, an energy storage battery A18, an energy storage battery B19, an exhaust fan 21, a direct current charging pile A22, a direct current charging pile B23, a UPS direct current power supply 24, an alternating current breaker A25, an alternating current breaker B26, an alternating current breaker C27, an alternating current breaker D55, an alternating current breaker E56, a first direct current breaker 28, a second direct current breaker 29, A third dc breaker 30, a fourth dc breaker 31, a fifth dc breaker 32, a sixth dc breaker 33, a seventh dc breaker 34, an eighth dc breaker 35, a ninth dc breaker 36, a tenth dc breaker 37, an eleventh dc breaker 38, a twelfth dc breaker 39, a thirteenth dc breaker 40, a fourteenth dc breaker 41, a fifteenth dc breaker 42, a sixteenth dc breaker 43, a seventeenth dc breaker 44, an eighteenth dc breaker 45, a nineteenth dc breaker 46, a twentieth dc breaker 47, a twenty-first dc breaker 48, a twenty-second dc breaker 49, a twenty-third dc breaker 50, a twenty-fourth dc breaker 51, a dc fuse a52, a dc fuse B53, a dc fuse C54, a smart energy scheduling management and fault monitoring system 57, a dc positive pole 58, a ninth dc fuse C negative pole, a dc fuse C negative pole C51, a smart energy scheduling management and fault monitoring system 57, A direct current neutral wire 59, a direct current bus negative electrode 60, a photovoltaic integrated system 61 and a micro wind power generation system 62.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
The direct-current microgrid technology has a great energy-saving advantage and a good development prospect, so that the requirements of various countries on energy conservation, emission reduction and comprehensive energy gradient utilization can be well met by constructing and developing the direct-current microgrid technology.
Example 1:
as shown in fig. 1, the smart dc microgrid system suitable for a building integrated energy supply station includes: the system comprises a photovoltaic integrated system 61, a miniature wind power generation system 62, an electric energy storage system, a commercial power transformer 3, a direct current bus, a voltage balancer 15, direct current lighting A17, direct current lighting B20, an intelligent energy dispatching management and fault monitoring system 57, an exhaust fan 21, a direct current charging pile A22, a direct current charging pile B23, a UPS direct current power supply 24, a plurality of DC/DC converters, a plurality of AC circuit breakers and a plurality of DC circuit breakers; the voltage balancer is adopted to inhibit the fluctuation of the positive and negative direct currents in the bipolar direct current micro-grid to the neutral line voltage, the bipolar three-wire system direct current micro-grid introduced into the voltage balancer can effectively improve the dynamic performance and the anti-interference capability of the system for controlling the direct current voltage balance, and the power supply reliability of the bipolar direct current micro-grid is improved;
the integrated photovoltaic system 61 comprises a cadmium telluride thin film solar cell 1 and a DC/DC converter A4, wherein the cadmium telluride thin film solar cell 1 is electrically connected with the DC/DC converter A4;
the micro wind power generation system 62 comprises a micro wind power generator 2 and an AC/DC converter C14, wherein an AC circuit breaker C27 is arranged on a connecting line between the micro wind power generator 2 and the AC/DC converter C14;
the electric energy storage system comprises an energy storage battery A18, an energy storage battery B19, a super capacitor 16, a DC/DC converter B5, a DC/DC converter D7 and a DC/DC converter E8; the super capacitor 16 is electrically connected with the DC/DC converter B5, and the DC/DC converter B5 is divided into two paths and is respectively connected with the seventh direct current breaker 34 and the eighth direct current breaker 35 and then sequentially connected with the direct current bus anode 58 and the direct current bus cathode 60; the energy storage battery A18 is electrically connected with the DC/DC converter D7, and the DC/DC converter D7 is divided into two paths and is respectively connected with the eleventh direct current breaker 38 and the twelfth direct current breaker 39 and then is sequentially connected with the direct current bus positive pole 58 and the direct current neutral line 59; the energy storage battery B19 is electrically connected with the DC/DC converter E8, and the DC/DC converter E8 is divided into two paths and is respectively connected with the thirteenth direct current breaker 40 and the fourteenth direct current breaker 41 and then is sequentially connected with the direct current bus cathode 60 and the direct current neutral wire 59; the super capacitor 16 has a good power characteristic, when a direct current charging pile in the system is used, the peak value of load current in the system is high but the duration is short, and at the moment, the super capacitor 16 releases energy through the intelligent energy scheduling management system, so that the running economy of the direct current micro-grid system is improved while the voltage stability of a direct current bus is maintained;
after being connected through a mains transformer 3, the mains supply is divided into two paths which are respectively connected to an AC/DC converter A12 and an AC/DC converter B13; an alternating current breaker E56 is arranged on a connecting line between one end of a commercial power transformer and one end of a commercial power transformer 3, an alternating current breaker D55 is arranged at the other end of the commercial power transformer 3, a line behind an alternating current breaker D55 is divided into two paths to be respectively connected with an alternating current breaker A25 and an alternating current breaker B26, the alternating current breaker A25 is connected into an AC/DC converter A12, and the alternating current breaker B26 is connected into an AC/DC converter B13; the AC/DC converter A12 is connected to the positive pole 58 of the direct current bus and the direct current neutral wire 59; the AC/DC converter B13 is connected to the negative pole 60 of the direct current bus and the direct current neutral wire 59;
the direct current bus is divided into three lines, namely a direct current bus positive pole 58, a direct current neutral line 59 and a direct current bus negative pole 60; the voltage balancer 15 is divided into three paths and is respectively connected with a direct current fuse A52, a direct current fuse B53 and a direct current fuse C54, and then is sequentially connected with a direct current bus positive pole 58, a direct current neutral line 59 and a direct current bus negative pole 60;
two ends of the direct current lighting A17 are electrically connected with a DC/DC converter C6, and the DC/DC converter C6 is divided into two paths to be respectively connected with a ninth direct current breaker 36 and a tenth direct current breaker 37 and then sequentially connected with a direct current bus positive pole 58 and a direct current neutral line 59; two ends of the direct current lighting B20 are electrically connected with a DC/DC converter F9, and the DC/DC converter F9 is divided into two paths to be respectively connected with a fifteenth direct current breaker 42 and a sixteenth direct current breaker 43 and then sequentially connected with a direct current bus cathode 60 and a direct current neutral wire 59;
the intelligent energy dispatching management and fault monitoring system 57 is electrically connected with the AC/DC converter a12, the AC/DC converter B13, the DC/DC converter a4, the AC/DC converter C14, the first DC breaker 28, the second DC breaker 29, the third DC breaker 30, the fourth DC breaker 31, the fifth DC breaker 32, the sixth DC breaker 33, the DC bus anode 58, the DC neutral line 59, the DC bus cathode 60, the seventh DC breaker 34, the eighth DC breaker 35, the ninth DC breaker 36, the tenth DC breaker 37, the eleventh DC breaker 38, the twelfth DC breaker 39, the thirteenth DC breaker 40, the fourteenth DC breaker 41, the fifteenth DC breaker 42, the sixteenth DC breaker 43, the seventeenth DC breaker 44, the eighteenth DC breaker 45, the nineteenth DC breaker 46, the sixth DC breaker 33, the sixth DC breaker 40, the sixteenth DC breaker 42, the sixteenth DC breaker 43, the seventeenth DC breaker 44, the, A twentieth direct current breaker 47, a twenty-first direct current breaker 48, a twenty-second direct current breaker 49, a twenty-third direct current breaker 50, a twenty-fourth direct current breaker 51, a DC/DC converter B5, a DC/DC converter C6, a DC/DC converter D7, a DC/DC converter E8, a DC/DC converter F9, a DC/DC converter G10, a direct current fuse a52, a direct current fuse B53, a direct current fuse C54, a DC/DC converter H11, a voltage balancer 15, a direct current charging pile a22 and a direct current charging pile B23;
the exhaust fan 21 is electrically connected with a DC/DC converter G10, and the DC/DC converter G10 is divided into two paths and respectively connected with a seventeenth direct current breaker 44 and an eighteenth direct current breaker 45 and then sequentially connected with a direct current bus anode 58 and a direct current bus cathode 60;
two ends of the direct current charging pile A22 are respectively and electrically connected with the nineteenth direct current breaker 46 and the twentieth direct current breaker 47 and then are sequentially connected with the direct current bus anode 58 and the direct current bus cathode 60; two ends of the direct current charging pile B23 are respectively and electrically connected with the twenty-first direct current breaker 48 and the twenty-second direct current breaker 49 and then are sequentially connected to the direct current bus anode 58 and the direct current bus cathode 60;
two ends of the UPS direct current power supply 24 are electrically connected with a DC/DC converter H11, and the DC/DC converter H11 is divided into two paths to be respectively connected with a twenty-third direct current breaker 50 and a twenty-fourth direct current breaker 51 and then sequentially connected with a direct current bus positive pole 58 and a direct current bus negative pole 60.
A mode of synergistic energy supply of various renewable energy sources is adopted, the photovoltaic integrated system 61 and the micro wind power generation system 62 are built based on the cadmium telluride thin film solar cell 1 to jointly supply power to the direct current bus, and an energy storage battery A18, an energy storage battery B19 and a super capacitor 16 with certain capacities are configured. When the renewable energy source generates less power under the influence of the external environment, the insufficient electric power is supplemented by the commercial power; when the electric load in the direct current micro-grid system is small, the energy storage battery A18, the energy storage battery B19 and the super capacitor 16 are charged preferentially, and then the rest electric quantity is used for being consumed by the upper public grid, so that the effects of energy conservation and emission reduction are achieved.
The intelligent energy dispatching management and fault monitoring system 57 is a core system of the intelligent direct current micro-grid system. The system establishes a cloud platform and a large database, and is an intelligent diversified energy optimization coordination control cloud platform integrating functions of energy monitoring, energy scheduling and management, demand side response and the like. The system platform monitors the operation conditions of key equipment such as power generation, power distribution and power utilization equipment in real time and collects and analyzes real-time data through an advanced sensing device aiming at the power load requirements in the building distributed energy operation and comprehensive energy supply stations, regulates and controls the output power of a distributed power generation unit and the charging and discharging actions of an energy storage unit, and realizes energy optimization, coordination, control, distribution and fault monitoring diagnosis. The intelligent energy scheduling management and fault monitoring system is mainly divided into four levels, namely a perception layer, a communication layer, a data layer and an application layer, and mainly comprises functions of a basic measurement system, load side energy management and energy optimization coordination control distribution, fault monitoring diagnosis and the like.
Example 2:
a working method of an intelligent direct current micro-grid system suitable for a building comprehensive energy supply station is characterized in that the intelligent direct current micro-grid system is switched and operated among a grid-connected mode, an island mode and an emergency mode;
when the intelligent direct-current micro-grid system operates in a grid-connected mode: the intelligent direct-current microgrid system is connected with a mains supply, and when the total load in the intelligent direct-current microgrid system is greater than the total generated power of the distributed renewable energy sources, the direct-current bus is supplied with power through an AC/DC converter A12 and an AC/DC converter B13 at the lower end of a mains supply transformer 3; when the total generated power of the distributed renewable energy is greater than the total load in the intelligent direct-current microgrid system, the power is supplied to the commercial power through an AC/DC converter A12 and an AC/DC converter B13 at the lower end of a commercial power transformer 3;
when the intelligent direct current micro-grid system operates in an island mode: the intelligent energy scheduling management and fault monitoring system 57 optimizes, coordinates and controls the distributed renewable energy sources, the energy storage battery A18, the energy storage battery B19, the super capacitor 16, the direct-current lighting A17 and the direct-current lighting B20, so that the total power generation power in the intelligent direct-current micro-grid system is balanced with the total load in the intelligent direct-current micro-grid system, the utilization rate of the distributed renewable energy sources is improved to the maximum extent, and the power supply reliability is guaranteed;
when the intelligent direct-current micro-grid system operates in an emergency mode: when the direct current bus supplies power to the UPS direct current power supply 24 after voltage is converted by the DC/DC converter H11, if the intelligent direct current micro grid system fails or is in a maintenance state and the output of distributed renewable energy cannot meet the power utilization requirement in the intelligent direct current micro grid system, cutting off direct current power utilization loads to maximally store electric energy in advance, wherein the direct current power utilization loads comprise a direct current charging pile A22 and a direct current charging pile B23; the emergency use of the UPS is met, and the power utilization requirement of the UPS for important loads such as cooling water pump motors in the comprehensive energy supply station is met.

Claims (9)

1. The utility model provides a little grid system of wisdom direct current suitable for energy supply station is synthesized to building which characterized in that includes: the system comprises a photovoltaic integrated system (61), a miniature wind power generation system (62), an electric energy storage system, a commercial power transformer (3), a direct current bus, a voltage balancer (15), a direct current lighting A (17), a direct current lighting B (20), an intelligent energy scheduling management and fault monitoring system (57), an exhaust fan (21), a direct current charging pile A (22), a direct current charging pile B (23), a UPS (uninterrupted power supply) direct current power supply (24), a plurality of DC/DC converters, a plurality of AC circuit breakers and a plurality of DC circuit breakers; the photovoltaic integrated system (61), the miniature wind power generation system (62), the electric energy storage system, the commercial power transformer (3), the voltage balancer (15), the direct-current lighting A (17), the direct-current lighting B (20), the intelligent energy scheduling management and fault monitoring system (57), the exhaust fan (21), the direct-current charging pile A (22), the direct-current charging pile B (23) and the UPS direct-current power supply (24) are all connected to a direct-current bus.
2. The intelligent direct-current micro-grid system applicable to the building comprehensive energy supply station as claimed in claim 1, wherein:
the integrated photovoltaic system (61) comprises a cadmium telluride thin-film solar cell (1) and a DC/DC converter A (4), wherein the cadmium telluride thin-film solar cell (1) is electrically connected with the DC/DC converter A (4);
the micro wind power generation system (62) comprises a micro wind power generator (2) and an AC/DC converter C (14), wherein an alternating current circuit breaker C (27) is arranged on a connecting line between the micro wind power generator (2) and the AC/DC converter C (14);
the electric energy storage system comprises an energy storage battery A (18), an energy storage battery B (19), a super capacitor (16), a DC/DC converter B (5), a DC/DC converter D (7) and a DC/DC converter E (8); the super capacitor (16) is electrically connected with the DC/DC converter B (5), and the DC/DC converter B (5) is divided into two paths to be respectively connected with the seventh direct current breaker (34) and the eighth direct current breaker (35) and then sequentially connected with the positive pole (58) and the negative pole (60) of the direct current bus; the energy storage battery A (18) is electrically connected with the DC/DC converter D (7), and the DC/DC converter D (7) is divided into two paths to be respectively connected with the eleventh direct current breaker (38) and the twelfth direct current breaker (39) and then sequentially connected with the direct current bus positive pole (58) and the direct current neutral line (59); the energy storage battery B (19) is electrically connected with the DC/DC converter E (8), and the DC/DC converter E (8) is divided into two paths to be respectively connected with the thirteenth direct current breaker (40) and the fourteenth direct current breaker (41) and then sequentially connected with a direct current bus cathode (60) and a direct current neutral line (59);
after being connected through a mains transformer (3), the mains supply is divided into two paths which are respectively connected into an AC/DC converter A (12) and an AC/DC converter B (13); an alternating current circuit breaker E (56) is arranged on a connecting line between one end of a commercial power transformer and one end of a commercial power transformer (3), an alternating current circuit breaker D (55) is arranged at the other end of the commercial power transformer (3), a line behind the alternating current circuit breaker D (55) is divided into two paths and is respectively connected with an alternating current circuit breaker A (25) and an alternating current circuit breaker B (26), the alternating current circuit breaker A (25) is connected into an AC/DC converter A (12), and the alternating current circuit breaker B (26) is connected into an AC/DC converter B (; the AC/DC converter A (12) is connected to a direct current bus positive pole (58) and a direct current neutral line (59); the AC/DC converter B (13) is connected with a direct current bus negative pole (60) and a direct current neutral line (59);
the direct current bus is divided into three circuits, namely a direct current bus positive electrode (58), a direct current neutral wire (59) and a direct current bus negative electrode (60); the voltage balancer (15) is divided into three paths to be respectively connected with a direct current fuse A (52), a direct current fuse B (53) and a direct current fuse C (54) and then sequentially connected with a direct current bus positive pole (58), a direct current neutral line (59) and a direct current bus negative pole (60);
two ends of the direct-current lighting A (17) are electrically connected with a DC/DC converter C (6), the DC/DC converter C (6) is divided into two paths to be respectively connected with a ninth direct-current breaker (36) and a tenth direct-current breaker (37) and then is sequentially connected with a direct-current bus positive pole (58) and a direct-current neutral line (59); two ends of the direct-current lighting B (20) are electrically connected with a DC/DC converter F (9), and the DC/DC converter F (9) is divided into two paths to be respectively connected with a fifteenth direct-current breaker (42) and a sixteenth direct-current breaker (43) and then sequentially connected into a direct-current bus cathode (60) and a direct-current neutral line (59);
the intelligent energy dispatching management and fault monitoring system (57) is electrically connected with an AC/DC converter A (12), an AC/DC converter B (13), a DC/DC converter A (4), an AC/DC converter C (14), a first direct current breaker (28), a second direct current breaker (29), a third direct current breaker (30), a fourth direct current breaker (31), a fifth direct current breaker (32), a sixth direct current breaker (33), a direct current bus positive pole (58), a direct current neutral line (59), a direct current bus negative pole (60), a seventh direct current breaker (34), an eighth direct current breaker (35), a ninth direct current breaker (36), a tenth direct current breaker (37), an eleventh direct current breaker (38), a twelfth direct current breaker (39), a thirteenth direct current breaker (40), a fourteenth direct current breaker (41), A fifteenth direct current breaker (42), a sixteenth direct current breaker (43), a seventeenth direct current breaker (44), an eighteenth direct current breaker (45), a nineteenth direct current breaker (46), a twentieth direct current breaker (47), a twenty-first direct current breaker (48), a twenty-second direct current breaker (49), a twenty-third direct current breaker (50), a twenty-fourth direct current breaker (51) and a DC/DC converter B (5), the system comprises a DC/DC converter C (6), a DC/DC converter D (7), a DC/DC converter E (8), a DC/DC converter F (9), a DC/DC converter G (10), a direct current fuse A (52), a direct current fuse B (53), a direct current fuse C (54), a DC/DC converter H (11), a voltage balancer (15), a direct current charging pile A (22) and a direct current charging pile B (23);
the exhaust fan (21) is electrically connected with the DC/DC converter G (10), the DC/DC converter G (10) is divided into two paths and is respectively connected with the seventeenth direct current breaker (44) and the eighteenth direct current breaker (45) and then is sequentially connected with the direct current bus anode (58) and the direct current bus cathode (60);
two ends of the direct current charging pile A (22) are respectively and electrically connected with a nineteenth direct current breaker (46) and a twentieth direct current breaker (47) and then sequentially connected with a direct current bus positive pole (58) and a direct current bus negative pole (60); two ends of a direct current charging pile B (23) are respectively and electrically connected with a twenty-first direct current breaker (48) and a twenty-second direct current breaker (49) and then are sequentially connected with a direct current bus positive pole (58) and a direct current bus negative pole (60);
two ends of the UPS (24) are electrically connected with the DC/DC converter H (11), and the DC/DC converter H (11) is divided into two paths to be respectively connected with the twenty-third direct-current breaker (50) and the twenty-fourth direct-current breaker (51) and then sequentially connected with the direct-current bus positive pole (58) and the direct-current bus negative pole (60).
3. The intelligent direct-current micro-grid system applicable to the building comprehensive energy supply station as claimed in claim 1, wherein: the AC/DC converter and the DC/DC converter are energy-saving converters adopting a zero-voltage zero-current soft switching technology; the direct current breaker is a solid-state direct current breaker based on IGBT technology.
4. The intelligent direct-current micro-grid system suitable for the building comprehensive energy supply station as claimed in claim 2, wherein the system comprises: the system comprises at least one photovoltaic integrated system (61) with a DC/DC converter, at least one miniature wind power generation system (62) with an AC/DC converter, at least one super capacitor (16) with the DC/DC converter, at least one direct current charging pile, at least one direct current lighting with the DC/DC converter, at least one UPS direct current power supply (24) with the DC/DC converter, at least one exhaust fan (21) with the DC/DC converter and an intelligent energy dispatching management and fault monitoring system (57).
5. The intelligent direct-current micro-grid system applicable to the building comprehensive energy supply station as claimed in claim 2, wherein: the direct-current bus is a bipolar three-wire system direct-current bus, the voltage level of the positive pole (58) of the direct-current bus is DC +375V, the voltage level of the negative pole (60) of the direct-current bus is DC-375V, and the voltage level of the direct-current neutral line (59) is zero.
6. The intelligent direct-current micro-grid system applicable to the building comprehensive energy supply station as claimed in claim 2, wherein: the dc fuse a (52), the dc fuse B (53) and the dc fuse C (54) are isolatable or replaceable devices.
7. The intelligent direct-current micro-grid system applicable to the building comprehensive energy supply station as claimed in claim 2, wherein: the energy storage battery A (18) and the energy storage battery B (19) adopt novel water system zinc ion batteries; the capacity of the energy storage battery A (18), the capacity of the energy storage battery B (19) and the capacity of the super capacitor (16) are configured according to the capacity of the cadmium telluride thin-film solar cell (1), the capacity of the micro wind driven generator (2), the power of the direct current lighting A (17), the power of the direct current lighting B (20), the number of the direct current charging piles A (22) and the number of the direct current charging piles B (23).
8. The intelligent direct-current micro-grid system applicable to the building comprehensive energy supply station as claimed in claim 2, wherein: the intelligent energy dispatching management and fault monitoring system (57) is connected with each monitoring control device communication interface through a bus or a hard wire; the intelligent energy dispatching management and fault monitoring system (57) is connected with each monitoring device through hard wiring;
the monitoring control apparatus includes: a DC/DC converter A (4), a DC/DC converter B (5), a DC/DC converter C (6), a DC/DC converter D (7), a DC/DC converter E (8), a DC/DC converter F (9), a DC/DC converter G (10), a DC/DC converter H (11), an AC/DC converter A (12), an AC/DC converter B (13), an AC/DC converter C (14), a direct current charging pile A (22), a direct current charging pile B (23), an alternating current breaker A (25), an alternating current breaker B (26), an alternating current breaker C (27), an alternating current breaker D (55), an alternating current breaker E (56), a first direct current breaker (28), a second direct current breaker (29), a third direct current breaker (30), a fourth direct current breaker (31), A fifth direct current breaker (32), a sixth direct current breaker (33), a seventh direct current breaker (34), an eighth direct current breaker (35), a ninth direct current breaker (36), a tenth direct current breaker (37), an eleventh direct current breaker (38), a twelfth direct current breaker (39), a thirteenth direct current breaker (40), a fourteenth direct current breaker (41), a fifteenth direct current breaker (42), a sixteenth direct current breaker (43), a seventeenth direct current breaker (44), an eighteenth direct current breaker (45), a nineteenth direct current breaker (46), a twentieth direct current breaker (47), a twenty-first direct current breaker (48), a twenty-second direct current breaker (49), a twenty-third direct current breaker (50), and a twenty-fourth direct current breaker (51);
the monitoring device includes: the voltage balancer (15), the direct current bus positive pole (58), the direct current neutral line (59) and the direct current bus negative pole (60).
9. An operating method of the intelligent direct current micro-grid system suitable for the building comprehensive energy supply station as claimed in claims 1 to 8, wherein: the intelligent direct-current micro-grid system is switched and operated among a grid-connected mode, an island mode and an emergency mode;
when the intelligent direct-current micro-grid system operates in a grid-connected mode: the intelligent direct-current micro-grid system is connected with a mains supply, and when the total load in the intelligent direct-current micro-grid system is larger than the total generated power of the distributed renewable energy sources, the direct-current bus is supplied with power through an AC/DC converter A (12) and an AC/DC converter B (13) at the lower end of a mains supply transformer (3); when the total generated power of the distributed renewable energy is larger than the total load in the intelligent direct-current microgrid system, the power is supplied to the commercial power through an AC/DC converter A (12) and an AC/DC converter B (13) at the lower end of a commercial power transformer (3);
when the intelligent direct current micro-grid system operates in an island mode: the intelligent energy scheduling management and fault monitoring system (57) optimizes, coordinates and controls the distributed renewable energy sources, the energy storage battery A (18), the energy storage battery B (19), the super capacitor (16), the direct current lighting A (17) and the direct current lighting B (20), so that the total generated power in the intelligent direct current micro-grid system is balanced with the total load in the intelligent direct current micro-grid system;
when the intelligent direct-current micro-grid system operates in an emergency mode: when the direct current bus supplies power to the UPS direct current power supply (24) after voltage is converted through the DC/DC converter H (11), if the intelligent direct current micro-grid system breaks down or is in a maintenance state and the distributed renewable energy output cannot meet the power utilization requirement in the intelligent direct current micro-grid system, the direct current power utilization load is cut off, electric energy is stored to the maximum extent in advance, and the direct current power utilization load comprises a direct current charging pile A (22) and a direct current charging pile B (23).
CN202110235380.7A 2021-03-03 2021-03-03 Intelligent direct-current micro-grid system suitable for building comprehensive energy supply station Pending CN112909914A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113328452A (en) * 2021-06-08 2021-08-31 湖南汽车工程职业学院 Retired power battery and retired super capacitor combined mobile energy storage charging system
CN113644643A (en) * 2021-07-22 2021-11-12 许继集团有限公司 AC/DC hybrid microgrid interface converter and control method
CN117952569A (en) * 2024-03-27 2024-04-30 山东省科学院能源研究所 Public building collaborative energy supply management system based on multisource renewable energy sources

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113328452A (en) * 2021-06-08 2021-08-31 湖南汽车工程职业学院 Retired power battery and retired super capacitor combined mobile energy storage charging system
CN113328452B (en) * 2021-06-08 2023-11-17 湖南汽车工程职业学院 Retired power battery and retired super capacitor combined movable energy storage charging system
CN113644643A (en) * 2021-07-22 2021-11-12 许继集团有限公司 AC/DC hybrid microgrid interface converter and control method
CN117952569A (en) * 2024-03-27 2024-04-30 山东省科学院能源研究所 Public building collaborative energy supply management system based on multisource renewable energy sources

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