CN205429765U - Little grid system of hybrid AC/DC based on distributing type bus structure - Google Patents
Little grid system of hybrid AC/DC based on distributing type bus structure Download PDFInfo
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- CN205429765U CN205429765U CN201620194172.1U CN201620194172U CN205429765U CN 205429765 U CN205429765 U CN 205429765U CN 201620194172 U CN201620194172 U CN 201620194172U CN 205429765 U CN205429765 U CN 205429765U
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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
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Abstract
The utility model discloses a little grid system of hybrid AC/DC based on distributing type bus structure, the little electric wire netting of each sub - direct current, son exchange little electric wire netting, distributed generator, energy storage system and distributed one -level dc bus and constitute the little electric wire netting of hybrid AC/DC. System's neutron exchanges, the little electric wire netting of direct current is connected in one -level dc bus two -stage process, other each unit connections are in one section one -level dc bus, through two -way direct current between two sections generating lines direct -current converter carries out power exchange, respectively the little electric wire netting of radial son passes through the converter connection and constitutes the little electric wire netting looply connected power supply region of hybrid AC/DC, can realize high low -voltage load's direct power feeding, between the little electric wire netting of each son, between the little electric wire netting of son and little electric wire netting, but the equal two -way flow of the power between little electric wire netting and public power grid, can improve the service reliability of system, economic nature and variety, realize that the high -efficient of renewable energy utilizes.
Description
Technical field
The utility model relates to a kind of alternating current-direct current mixing micro-grid system.Especially relate to one and there is distributed multi-stage irradiation shape
The alternating current-direct current mixing micro-grid system that between bus and each sub-micro-capacitance sensor, power can rationally exchange.
Background technology
In recent years, along with the progress of expanding economy with science and technology, energy crisis and environmental problem increasingly highlight, and gradually cause
The attention of country and people and concern, find the method that can extensively apply regenerative resource, as early as possible to replace fossil fuel
Consume, be the only way which must be passed of people's sustainable development.Meanwhile, along with the raising of people's living standard, power consumption rises year by year,
Cause power system to present the feature that power load is continuously increased, transmission line capability is gradually increased, and current Large Copacity is centralized
The interconnected power grid operation cost that generating, remote high voltage transmit is high, it is the most convex to run the problem that difficulty is big, regulating power is weak
Aobvious, it is difficult to meet the highest security of user, reliability, diversity, flexibility power demands.Along with novel electric power electricity
The continuous maturation of sub-technology, distributed generation technology based on green energy resources such as wind, light, heat, storages is flourish.Distributed
Electricity has energy utilization rate height, environmental pollution is little, the advantages such as flexibility is strong, input cost is low of powering, and develops high-efficiency and economic
Distributed generation technology be to solve energy crisis and the effective way of environmental problem.
Distributed power source based on regenerative resource has obvious intermittence, randomness and fluctuation, when large-scale distribution
Formula power supply unit accesses bulk power grid, and bulk power grid can cause the biggest impact.Therefore, bulk power grid usually to distributed power source make every
From process, thus can not give full play to the advantage of distributed power source, more can not utilize efficiently can be at the raw energy.In order to slow down
The large-scale distributed power supply unit networking impact to bulk power grid, makes up power system infiltration extensive to distributed power source carrying energy
The deficiency of power, gives full play to the advantage of distributed generation technology, and the concept of micro-capacitance sensor is arisen at the historic moment.Micro-capacitance sensor is by distributed electrical
Source, load cell and energy storage device are managed independently according to possessing of forming of specific topological structure, are protected, control ability intensive
Change novel electric power network, be with generation of electricity by new energy technology as pillar, low inertia power electronic equipment take as the leading factor multiple constraint, many shapes
State, the autonomous power system of various dimensions.Micro-capacitance sensor has grid-connected and two kinds of operational modes of isolated island, and can be between both of which
Smooth and seamless switches, and general have flexibility and the controllability of " plug and play " by single-point access major network, is following intelligence
The important component part of electrical network.When micro-capacitance sensor is in grid-connect mode, public electric wire net, distributed power source and the one of load can be realized
The step of body coordinated operation and various energy resources efficiently utilizes；When bulk power grid breaks down, micro-capacitance sensor passes through islanding control
Enter island mode, individually power to sensitive load, fully meet user to Supply Security, reliability requirement.
In order to tackle the severe challenge that the utilization of distributed power source faces at aspects such as power supply quality, continuity, stability, efficiently
Reliably energy-storage system be with new forms of energy as pillar, the properly functioning guarantee of the micro-capacitance sensor taken as the leading factor of low inertia power electronic equipment.
Energy-storage system application in micro-capacitance sensor is as follows: 1) by the energy-storage system control strategy of rational and orderly, make up distributed power source with
Machine, intermittence and uncontrollability defect, strengthen stability and the schedulability of distributed power source；2) charge when load valley,
Discharge when load peak, realize the peak load shifting of load as microgrid energy buffering link, improve micro-capacitance sensor economy and
Reliability；3) fast response characteristic based on energy-storage system, slows down the transient state impact of pattern switching transition, it is achieved micro-capacitance sensor is seamless
Take over seamlessly, and the islet operation for micro-capacitance sensor provides voltage and frequency to support；4) active power is provided to support or nothing for micro-capacitance sensor
Reactive power compensator, smooth micro-capacitance sensor voltage pulsation, improves the quality of power supply of micro-capacitance sensor.
Under the demand that distributed power source large-scale grid connection, load level improve constantly, micro-capacitance sensor technology is flourish, following
Intelligent grid by be new forms of energy hypersynchronous, trend two-way flow, have splendid flexibility and blending property alternating current-direct current mixing the most micro-
Network system.Alternating current-direct current mixing micro-capacitance sensor not only contains dc bus but also containing ac bus, both can directly power to DC load
Directly can power to AC load again, solve the problems that the repeatedly change of current brings, reduce the energy that power converter brings
Loss, has higher efficiency and flexibility, is following most potential power distribution network form.It has direct current component independent operating,
AC portion independent operating, alternating current-direct current Partial coordination run three kinds of operational modes, enumerate exchange micro-capacitance sensor and direct-current grid
Advantage, all has preferable compatibility to alternating current-direct current distributed power source.
Current micro-capacitance sensor is in the starting stage, and the type of architecture about micro-capacitance sensor is relatively fewer, instantly through conventional micro-capacitance sensor frame
Structure mostly is centralized single busbar type, and the power-supplying forms in micro-capacitance sensor is the most single, causes economy and stability to poor.Right
In the micro-capacitance sensor of centralized single busbar, when common bus breaks down, the equipment needs that bus is connected are by the side disconnected
Formula is come and fault reconstruction, so may result in the less stable of system, and inefficient.Meanwhile, the energy storage dress of single type
Putting the demand for development that can not meet micro-capacitance sensor, in micro-capacitance sensor, mixed energy storage system will progressively replace single energy storage device.Not
Come electrical network by be exchange mix with direct current, the electrical network of distributed power source hypersynchronous, if study only be focusing only on DC micro-electric
Net or exchange micro-capacitance sensor, then micro-capacitance sensor application effect in actual power distribution network will be had a greatly reduced quality.It addition, along with economic sends out
Exhibition and the raising of people's living standard, the requirement for power supply diversity and reliability is more and more higher, it is desirable to have shape of more powering
Formula occurs with framework.
Summary of the invention
Technical problem to be solved in the utility model is, it is proposed that alternating current-direct current of based on distributed bus structure mixing micro-capacitance sensor system
System, by systems arrange include the distributed bus framework of two sections of one-level dc bus, radial two grades of alternating current-direct current buses,
Radial three grades of dc bus, improve power supply flexibility, diversity and the reliability of system, utilize sub-direct-current grid simultaneously
Between exchange the to and fro flow of power feature between micro-capacitance sensor with son, improve the interactive of each unit in system, utilize hybrid energy-storing system
System improves the power supply quality of micro-capacitance sensor, thus realizes the efficient cascade utilization of regenerative resource, alleviates environmental pollution and energy danger
The pressure of machine.
The utility model be the technical scheme is that include public electric wire net unit, hybrid energy-storing unit, distributed power unit,
Two-way DC-DC (DC-DC) converter, sub-micro-capacitance sensor unit, one-level dc bus one section and one-level dc bus two sections,
Wherein: described public electric wire net unit, public electric wire net connects a transformer, and the opposite side correspondence connection one of transformer is two-way
AC-DC (AC-DC) converter, it is female that the opposite side of two-way exchange-direct current (AC-DC) converter is connected to one-level direct current
On one section of line；Described hybrid energy-storing unit, mixed energy storage system connects primary two-way DC-DC (DC-DC) conversion
Device, the opposite side correspondence of primary two-way DC-DC (DC-DC) converter is connected on one-level dc bus one section；Described
Distributed power unit, including fuel cell, photovoltaic cell, miniature combustion engine and wind-driven generator, wherein fuel cell and photovoltaic electric
Pond is all connected on one-level dc bus one section each via DC-to-dc (DC-DC) converter, and miniature combustion engine and wind-force are sent out
Motor is all connected on one-level dc bus one section each via AC-DC (AC-DC) converter；The micro-electricity of described son
Net unit, including sub-direct-current grid, sub-exchange micro-capacitance sensor, two-way DC-DC (DC-DC) converter and two-way exchange-
Exchange (AC-AC) converter, is connected by two-way DC-DC (DC-DC) converter between the most each sub-direct-current grid,
By the connection of two-way exchange-exchange (AC-AC) converter between each sub-exchange micro-capacitance sensor, each sub-direct-current grid sub exchanges with each
Micro-capacitance sensor is simultaneously connected with on one-level dc bus two sections, thus constitutes looply connected power supply framework；Described two-way DC-DC
(DC-DC) converter is connected between one-level dc bus one section and one-level dc bus two sections.
Described mixed energy storage system includes two secondary two-way DC-DC (DC-DC) converters, battery and super capacitor,
The side of two of which secondary two-way DC-DC (DC-DC) converter is connected respectively battery and super capacitor, another
Side mode in parallel connects primary two-way DC-DC (DC-DC) converter.
Described sub-direct-current grid includes that one is connected to one-level dc bus by two-way DC-DC (DC-DC) converter
Radial two grades of dc bus on two sections, one be connected to radial two grades by Unidirectional direct-current-direct current (DC-DC) converter
Radial three grades of dc bus on dc bus, it is connected to radial three grades of direct currents by DC-to-dc (DC-DC) converter
Low-voltage direct load on bus, by DC-AC (DC-AC) converter be connected on radial three grades of dc bus low
Press AC load, battery, photovoltaic cell, fuel cell, be connected to radial by DC-to-dc (DC-DC) converter
HVDC load on two grades of dc bus, wherein, photovoltaic cell and fuel cell are respectively by DC-to-dc (DC-DC)
Converter is connected on radial two grades of dc bus, and battery is connected to spoke by two-way DC-DC (DC-DC) converter
Penetrate on two grades of dc bus of shape.
Described son exchange micro-capacitance sensor includes that one is connected to one-level dc bus by bidirectional, dc-exchange (DC-AC) converter
Radial two grades of ac bus on two sections, battery, wind-driven generator, miniature combustion engine, become by AC-AC (AC-AC)
Parallel operation is connected to the high-voltage alternating load on radial two grades of ac bus, and wherein, wind-driven generator and miniature combustion engine are respectively by handing over
Stream-exchange (AC-AC) converter is connected on radial two grades of ac bus, and battery passes through two-way exchange-direct current (AC-DC)
Converter is connected on radial two grades of ac bus.
Described two-way DC-DC (DC-DC) converter is connected to radial two grades of dc bus of two sub-direct-current grid
Between, two-way exchange-exchange (AC-AC) converter is connected between radial two grades of ac bus of two son exchange micro-capacitance sensor.
The utility model provides alternating current-direct current mixing micro-grid system based on distributed bus structure, and it provides the benefit that: realize
The orderly function of distributed power source and the efficient cascade utilization of regenerative resource, alleviate environmental pollution and the pressure of energy crisis；Profit
The mixed energy storage system formed with battery and super capacitor, stabilizes power swing, improves power supply quality；Mixed energy storage system is adopted
Take two-step evolution device, increase the schedulability of power；Utilize the power bi-directional stream exchanging between micro-capacitance sensor with son between sub-direct-current grid
Dynamic feature, improves the interactive of each unit in system；Arrange and include the distributed bus framework of two sections of one-level dc bus, spoke
Penetrate two grades of alternating current-direct current buses of shape, radial three grades of dc bus, improve power supply flexibility, diversity and the reliability of system,
And by the reasonable setting of each micro battery with load, improve the utilization ratio of the energy；By the setting of distributed bus framework, carry
High power supply reliability and stability, the sub-micro-capacitance sensor unit of mixing connects into the alternating current-direct current of how radial bus by specific mode
Mixing micro-capacitance sensor looply connected power supply region, improves the economy of system.
Accompanying drawing explanation
Fig. 1 is the structural representation of alternating current-direct current mixing micro-grid system based on distributed bus structure；
Fig. 2 is the structural representation that sub-direct-current grid and son exchange micro-capacitance sensor；
Fig. 3 is the structural representation of mixed energy storage system；
Fig. 4 is the structural representation of connected mode between each sub-micro-capacitance sensor.
In figure
1: public electric wire net unit 2: hybrid energy-storing unit
3: distributed power unit 4: two-way DC-DC converter
5: sub-micro-capacitance sensor unit 6: one-level dc bus one section
7: one-level dc bus two section 11: public electric wire net
12: transformer 13: two-way exchange-DC converter
21: mixed energy storage system 22: primary two-way DC-DC converter
31: fuel cell 32: photovoltaic cell
33: miniature combustion engine 34: wind-driven generator
35: DC-DC converter 36: DC-DC converter
37: A.C.-D.C. converter 38: A.C.-D.C. converter
51: sub-direct-current grid 52: sub-exchange micro-capacitance sensor
53: two-way DC-DC converter 54: two-way exchange-AC converter
Detailed description of the invention
Below in conjunction with the accompanying drawings alternating current-direct current mixing micro-grid system based on distributed bus structure of the present utility model is made furtherly
Bright.
Alternating current-direct current mixing micro-grid system based on distributed bus structure of the present utility model, by distributed power source, mixing storage
Energy system, the one-level dc bus of distributed structure/architecture, radial two or three grades of buses, sub-direct-current grid and son exchange micro-capacitance sensor
Form the alternating current-direct current mixing micro-grid system of distributed bus structure.System is provided with three grades of buses, straight including distributed one-level
Stream bus, two grades of dc bus, two grades of ac bus and three grades of dc bus, distributed one-level dc bus includes two sections,
Both are connected by two-way DC-DC (DC-DC) converter, and its electric pressure is 500V, and two grades of dc bus are voltage
Grade is the middle pressure dc bus of 380V, two grades of ac bus be electric pressure be the middle pressure ac bus of 220V, three grades of direct currents
Bus be electric pressure be the low-voltage direct bus of 48V.By multistage bus and the setting of distributed bus, thus increase system
Functional diversity, improve power supplying efficiency.Be provided with on one-level dc bus one section public electric wire net unit, hybrid energy-storing unit,
Distributed power unit, one-level dc bus two sections is provided with sub-direct-current grid and exchanges micro-capacitance sensor with son, and by specific
Connected mode constitutes looply connected power supply region, wherein: alternating current-direct current mixing micro-grid system can be by the break-make with public electric wire net unit
Control grid-connected or island operation state；Hybrid energy-storing unit can balance system power by charge and discharge control and fluctuate, thus
Maintenance DC bus-bar voltage is stable；Distributed power unit includes miniature combustion engine and wind-driven generator, the output direct current exporting alternating current
The fuel cell of electricity and photovoltaic cell, thus make full use of regenerative resource；Sub-direct-current grid exchanges micro-capacitance sensor with son and is connected to
On one-level dc bus two sections, the running status of each sub-micro-capacitance sensor equally autonomous control system, improves for electrical stability.Two
Level dc bus and two grades of ac bus are respectively arranged at sub-direct-current grid and exchange in micro-capacitance sensor, in order to increase the confession of system with son
Electrical efficiency, improves the economy of system, exports galvanic photovoltaic cell and fuel cell is connected on two grades of dc bus, defeated
The wind-driven generator and the miniature combustion engine that go out alternating current are connected on two grades of ac bus, are both provided with battery on two buses simultaneously,
Stabilize power swing simultaneously.Connect on three grades of dc bus and have low-voltage alternating-current load and low-voltage direct load.
Alternating current-direct current mixing micro-grid system based on distributed bus structure as shown in Figure 1, including public electric wire net unit 1, mixes
Close energy-storage units 2, distributed power unit 3, two-way DC-DC (DC-DC) converter 4, sub-micro-capacitance sensor unit 5,
Level dc bus one section 6 and one-level dc bus two section 7, wherein: described public electric wire net unit 1, public electric wire net 11 connects
One transformer 12, the opposite side correspondence of transformer 12 connects two-way exchange-direct current (AC-DC) converter 13, two-way
The opposite side of AC-DC (AC-DC) converter 13 is connected on one-level dc bus one section 6；Described hybrid energy-storing list
Unit 2, mixed energy storage system 21 connects primary two-way DC-DC (DC-DC) converter 22, primary bidirectional, dc-straight
The opposite side correspondence of stream (DC-DC) converter 22 is connected on one-level dc bus one section 6；Described distributed power unit
3, including fuel cell 31, photovoltaic cell 32, miniature combustion engine 33 and wind-driven generator 34, wherein fuel cell 31 and photovoltaic electric
Pond 32 is all connected on one-level dc bus one section 6 each via DC-to-dc (DC-DC) converter 35/36, micro-
Combustion engine 33 and wind-driven generator 34 are all connected to one-level direct current each via AC-DC (AC-DC) converter 37/38
On bus one section 6；Described sub-micro-capacitance sensor unit 5, including sub-direct-current grid 51, sub-exchange micro-capacitance sensor 52, bidirectional, dc
-direct current (DC-DC) converter 53 and two-way exchange-exchange (AC-AC) converter 54, the most each sub-direct-current grid 51
Between connected by two-way DC-DC (DC-DC) converter 53, between each sub-exchange micro-capacitance sensor 52 by two-way exchange-
Exchange (AC-AC) converter 54 connects, and each sub-direct-current grid 51 is simultaneously connected with in one-level straight with each sub micro-capacitance sensor 52 that exchanges
On stream bus two section 7, thus constitute looply connected power supply framework；Described two-way DC-DC (DC-DC) converter 4 is connected to
Between one-level dc bus one section 6 and one-level dc bus two section 7.
Public electric wire net unit 1, hybrid energy-storing unit 2 and distributed power unit 3 and the sub-micro-capacitance sensor unit 5 of alternating current-direct current mixing
Constituting AC/DC mixing micro-grid system, alternating current-direct current mixing micro-capacitance sensor has grid-connected with two kinds of running statuses of isolated island, and can be
Between both of which smooth and seamless switching, when alternating current-direct current mixing micro-capacitance sensor is in grid-connect mode, can realize public electric wire net unit 1,
The step of distributed power unit 3 coordinated operation integrated with load and various energy resources efficiently utilizes；When public electric wire net list
When unit 1 breaks down, alternating current-direct current mixing micro-capacitance sensor enters island mode by islanding control, individually powers to load, the fullest
Foot Supply Security, reliability requirement.Alternating current-direct current mixing micro-grid system can use master-slave control mode, equity control model
Or hierarchical control pattern, to ensure the power-balance of system and stablizing of each busbar voltage.Two-way exchange-direct current (AC-DC) becomes
Parallel operation 13 can use droop control, power limitation control or constant voltage/constant frequency to control, and it controls alternating current-direct current mixing micro-capacitance sensor with public
The Power Exchange of electrical network 11.Hybrid energy-storing unit 2 uses battery that energy density is big and power density is big, have extended cycle life
The hybrid energy-storing form that super capacitor is combined into, improves power output capacity, the service life of extension fixture.Distributed power source list
Each micro battery in unit 3 passes through scheduling requirement and the instruction of local controller of system, determines control strategy and controls power output.
Convert 4 devices by two-way DC-DC (DC-DC) between one-level dc bus one section 6 and one-level dc bus two section 7 to connect,
Two parts can carry out Power Exchange, and after a portion breaks down, another part still can normally be connected to phase
Run on the bus answered.Sub-direct-current grid 51 in system, the quantity of sub-exchange micro-capacitance sensor 52 can be according to actual load feelings
Condition determines.When any one sub-direct-current grid 51 or son exchange micro-capacitance sensor 52 break down in system, off-the-line can be passed through
Control to isolate, it is ensured that the safe power supply of other loads, and when other section failure in system, sub-DC micro-electric
Net 51 or son exchange micro-capacitance sensor 52 can also enter island operation state by islanding control, thus ensure that intrasystem load supplies
Electricity, which improves power supply reliability, security and flexibility.
Sub-direct-current grid as shown in Figure 2 exchanges the structural representation of micro-capacitance sensor with son, and described sub-direct-current grid 51 includes
One by two-way DC-DC (DC-DC) converter 514 be connected on one-level dc bus two section 7 radial two grades straight
Stream bus 513, is connected to radial two grades of dc bus 513 by Unidirectional direct-current-direct current (DC-DC) converter 512
On radial three grades of dc bus 511, be connected to radial three grades of direct currents by DC-to-dc (DC-DC) converter 5111
Low-voltage direct load 515 on bus 511, by DC-AC (DC-AC) converter 5112 be connected to radial three grades straight
Low-voltage alternating-current load 516 on stream bus 511, battery 517, photovoltaic cell 518, fuel cell 519, by direct current-straight
Stream (DC-DC) converter 5116 is connected to the HVDC load 5110 on radial two grades of dc bus 513, wherein,
Photovoltaic cell 518 and fuel cell 519 are connected to radial by DC-to-dc (DC-DC) converter 5114/5115 respectively
On two grades of dc bus 513, battery 517 is connected to radial by two-way DC-DC (DC-DC) converter 5113
On two grades of dc bus 513.
Described son exchange micro-capacitance sensor 52 includes that one is connected to one-level by bidirectional, dc-exchange (DC-AC) converter 522
Radial two grades of ac bus 521 on dc bus two section 7, battery 523, wind-driven generator 524, miniature combustion engine 525,
It is connected to the high-voltage alternating load 526 on radial two grades of ac bus 521 by AC-AC (AC-AC) converter 5210,
Wherein, wind-driven generator 524 and miniature combustion engine 525 are connected to spoke by AC-AC (AC-AC) converter 528/529 respectively
Penetrating on two grades of ac bus 521 of shape, battery 523 is connected to radiation by two-way exchange-direct current (AC-DC) converter 527
On two grades of ac bus 521 of shape.
The topological form that sub-direct-current grid 51 exchanges micro-capacitance sensor 52 with son is radial, and hands over son between sub-direct-current grid
All connected by converter between stream micro-capacitance sensor, such that it is able to constitute ring-type alternating current-direct current mixing micro-capacitance sensor service area, so can be
Power supply flexibility is improved while improving power supply reliability.The setting of multi-stage irradiation shape bus, adds power supply flexibility, and son is straight
Stream micro-capacitance sensor 51 can be that low-voltage load is directly powered, and can be the most also that HVDC load 5110 is powered, sub-exchange micro-capacitance sensor 52
Can be that high-voltage alternating load 526 is powered.Battery in sub-micro-capacitance sensor can power swing in balance system, maintain direct current
Stablizing of bus.Sub-direct-current grid 51 exchanges micro-capacitance sensor 52 with son respectively by two-way DC-DC (DC-DC) converter
514 with bidirectional, dc-exchange (DC-AC) converter 522 and other unit generation Power Exchange, one-level dc bus two section 7
And the flow of power between 513, two grades of ac bus 521 of two grades of dc bus is two-way, between each sub-micro-capacitance sensor, sub-micro-capacitance sensor
With the power between alternating current-direct current mixing micro-capacitance sensor, between alternating current-direct current mixing micro-capacitance sensor and public electric wire net all can two-way flow, increase
Add the interactivity of system, improve the reliability mutually supported between each unit.
Mixed energy storage system as shown in Figure 3, secondary two-way DC-DC (DC-DC) converter 211 and secondary bidirectional, dc
The side of-direct current (DC-DC) converter 212 is connected respectively battery 213 and super capacitor 214, and opposite side is by also
Connection mode connects primary two-way DC-DC (DC-DC) converter 22.When system emergent power fluctuates, battery 213
Absorbing or release low frequency power, super capacitor 214 absorbs or discharges high frequency power, and primary two-way DC-DC (DC-DC) becomes
Parallel operation 22 controls the overall power of mixed energy storage system 21 and flows, and secondary two-way DC-DC (DC-DC) converter 211
Battery 213 and the power stream of super capacitor 214 is controlled the most respectively with secondary two-way DC-DC (DC-DC) converter 212
Dynamic, by the setting of two-step evolution device, increase the schedulability of power.
Connected mode between each sub-micro-capacitance sensor as shown in Figure 4, described two-way DC-DC (DC-DC) converter 53 connects
Between two grades of dc bus 513 of radial shape of two sub-direct-current grid 51, two-way exchange-exchange (AC-AC) converts
Device 54 is connected between radial two grades of ac bus 521 of two son exchange micro-capacitance sensor 52.Each sub-direct-current grid 51 and son
Exchange micro-capacitance sensor 52 can be interconnected by the form of cluster and run, and can be assisted with group by group's power dispatching between each sub-micro-capacitance sensor
Regulation and control system realizes mutual support and control.
Claims (5)
1. alternating current-direct current mixing micro-grid system based on distributed bus structure, it is characterised in that include public electric wire net unit (1),
Hybrid energy-storing unit (2), distributed power unit (3), two-way DC-DC (DC-DC) converter (4), sub-micro-capacitance sensor
Unit (5), one-level dc bus one section (6) and one-level dc bus two sections (7), wherein:
Described public electric wire net unit (1), public electric wire net (11) connects a transformer (12), another of transformer (12)
Side correspondence connects a two-way exchange-direct current (AC-DC) converter (13), two-way exchange-direct current (AC-DC) converter (13)
Opposite side be connected on one-level dc bus one section (6)；
Described hybrid energy-storing unit (2), mixed energy storage system (21) connects a primary two-way DC-DC (DC-DC)
Converter (22), it is female that the opposite side correspondence of primary two-way DC-DC (DC-DC) converter (22) is connected to one-level direct current
On one section of line (6)；
Described distributed power unit (3), including fuel cell (31), photovoltaic cell (32), miniature combustion engine (33) and wind
Power generator (34), wherein fuel cell (31) and photovoltaic cell (32) are all each via a DC-to-dc (DC-DC)
Converter (35/36) is connected on one-level dc bus one section (6), and miniature combustion engine (33) and wind-driven generator (34) are the most each
It is connected on one-level dc bus one section (6) from by an AC-DC (AC-DC) converter (37/38)；
Described sub-micro-capacitance sensor unit (5), including sub-direct-current grid (51), sub-exchange micro-capacitance sensor (52), bidirectional, dc-
Direct current (DC-DC) converter (53) and two-way exchange-exchange (AC-AC) converter (54), the most each sub-DC micro-electric
Connected by two-way DC-DC (DC-DC) converter (53) between net (51), between each sub-exchange micro-capacitance sensor (52)
Being connected by two-way exchange-exchange (AC-AC) converter (54), each sub-direct-current grid (51) sub exchanges micro-capacitance sensor with each
(52) it is simultaneously connected with on one-level dc bus two sections (7), thus constitutes looply connected power supply framework；
Described two-way DC-DC (DC-DC) converter (4) is connected to one-level dc bus one section (6) and one-level direct current
Between bus two sections (7).
Alternating current-direct current mixing micro-grid system based on distributed bus structure the most according to claim 1, it is characterised in that
Described mixed energy storage system (21) includes secondary two-way DC-DC (DC-DC) converter (211), secondary bidirectional, dc
-direct current (DC-DC) converter (212), battery (213) and super capacitor (214), wherein secondary two-way DC-DC
(DC-DC) converter (211) is the most corresponding with the side of secondary two-way DC-DC (DC-DC) converter (212) even
Connecing battery (213) and super capacitor (214), opposite side mode in parallel connects primary two-way DC-DC (DC-DC)
Converter (22).
Alternating current-direct current mixing micro-grid system based on distributed bus structure the most according to claim 1, it is characterised in that
Described sub-direct-current grid (51) includes that one is connected to one by two-way DC-DC (DC-DC) converter (514)
Radial two grades of dc bus (513) in level dc bus two sections (7), one by Unidirectional direct-current-direct current (DC-DC)
Radial three grades of dc bus (511) that converter (512) is connected on radial two grades of dc bus (513), by straight
Stream-direct current (DC-DC) converter (5111) be connected to the low-voltage direct load (515) on radial three grades of dc bus (511),
It is connected to the low-voltage alternating-current on radial three grades of dc bus (511) by DC-AC (DC-AC) converter (5112)
Load (516), battery (517), photovoltaic cell (518), fuel cell (519), by DC-to-dc (DC-DC)
Converter (5116) is connected to the HVDC load (5110) on radial two grades of dc bus (513), wherein, photovoltaic
Battery (518) and fuel cell (519) are connected to spoke by DC-to-dc (DC-DC) converter (5114/5115) respectively
Penetrating on two grades of dc bus (513) of shape, battery (517) passes through two-way DC-DC (DC-DC) converter (5113)
It is connected on radial two grades of dc bus (513).
Alternating current-direct current mixing micro-grid system based on distributed bus structure the most according to claim 1, it is characterised in that
Described son exchange micro-capacitance sensor (52) includes that one is connected to one by bidirectional, dc-exchange (DC-AC) converter (522)
Radial two grades of ac bus (521) in level dc bus two sections (7), battery (523), wind-driven generator (524),
Miniature combustion engine (525), it is connected to radial two grades of ac bus (521) by AC-AC (AC-AC) converter (5210)
On high-voltage alternating load (526), wherein, wind-driven generator (524) and miniature combustion engine (525) are respectively by AC-AC (AC-AC)
Converter (528/529) is connected on radial two grades of ac bus (521), and battery (523) passes through two-way exchange-direct current
(AC-DC) converter (527) is connected on radial two grades of ac bus (521).
Alternating current-direct current mixing micro-grid system based on distributed bus structure the most according to claim 1, it is characterised in that
Described two-way DC-DC (DC-DC) converter (53) is connected to radial two grades of two sub-direct-current grid (51)
Between dc bus (513), two-way exchange-exchange (AC-AC) converter (54) is connected to two sons exchange micro-capacitance sensor (52)
Radial two grades of ac bus (521) between.
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| CN113472020A (en) * | 2021-06-29 | 2021-10-01 | 国网江苏省电力有限公司电力科学研究院 | Novel AC/DC hybrid data center power supply control system and control method |
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