CN209709691U - The alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier - Google Patents
The alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier Download PDFInfo
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- CN209709691U CN209709691U CN201920168585.6U CN201920168585U CN209709691U CN 209709691 U CN209709691 U CN 209709691U CN 201920168585 U CN201920168585 U CN 201920168585U CN 209709691 U CN209709691 U CN 209709691U
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Abstract
The utility model discloses a kind of alternating current-direct current mixing microgrid frameworks integrated with distribution transformer rectifier, including being connected with distribution transformer rectifier (200) input terminal for the AC distribution net (100) to distribution transformer rectifier (200) input High Level AC Voltage, High Level AC Voltage for inputting alternating-current system (100) is converted into the distribution transformer rectifier (200) of low-voltage AC and low-voltage DC, it is connected with distribution transformer rectifier (200) ac output end for low-voltage AC to be supplied to AC load (300) and is connected with distribution transformer rectifier (200) DC output end for low-voltage DC to be supplied to direct current power unit (400)；AC load (300) and direct current power unit (400) mutually isolated setting.The utility model offer can reduce transform part, improve power supply reliability, conversion efficiency, system stability, reduce system cost simultaneously.
Description
Technical field
The utility model relates to smart grid fields, and in particular to a kind of alternating current-direct current integrated with distribution transformer rectifier is mixed
Close microgrid framework.
Background technique
With the application of new energy and the development of energy storage technology, the application of direct current supply is increasingly popularized, direct current supply capacity
It is continuously improved, has gradually formed the micro power network with direct current for main powering mode, abbreviation direct-current micro-grid.In practical application, very
The microgrid of rare pure direct current isolated operation, more common occasion, which is direct current, to be needed to carry out hybrid power supply with exchanging, and is just able to satisfy friendship
The joint demand and the highly reliable power supply of realization, such micro-capacitance sensor of DC load are known as alternating current-direct current mixing microgrid.
Existing all microgrid frameworks are all inputted using the output of distribution transformer (exchange 380V) as exchange, topological structure
Substantially it is divided into following three classes:
1) unidirectional power flows, as shown in Figure 1, distribution transformer and the unidirectional AC/DC of isolation indicate isolating points, feature
It is: without generation of electricity by new energy and energy storage device；The power one-way flow of AC/DC converter；Side zero line grounding is exchanged, DC side is outstanding
Floating power supply.
2) two-way AC/DC converter, as shown in Fig. 2, its main feature is that: contain generation of electricity by new energy and energy storage device；AC/DC transformation
Device supports bi-directional power flow；AC load zero line grounding, direct current system are not isolated with AC system, non-suspension power supply.
3) electric power electric transformer, as shown in figure 3, its main feature is that: contain generation of electricity by new energy and energy storage device；With power electronics
Transformer is the power converter of core, supports bi-directional power flow；Electric power electric transformer power can not be made very big, limit
System scale；AC load side zero curve is earth-free, and AC and DC is all the power supply that suspends, and AC and DC is not isolated.
Three of the above scheme has following common ground: 1. requiring common electrical distribution transformer；2. all with distribution transformer
380V output voltage be input carry out power conversion；3. all with AC/DC converter for main DC power supply；4. transform part
It is more, cause reliability reduction, overall efficiency low, system cost is high；5. the synthetic operation of multiple AC/DC and DC/DC conversion equipments,
The problems such as bringing stability and resonance.
Utility model content
The utility model be in order to overcome in the prior art microgrid framework transform part it is more, cause reliability reduce, is comprehensive
Low efficiency, the high technical problem of system cost provide a kind of alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier,
Integrated by distribution transformer rectifier can export mutually isolated AC and DC voltage simultaneously, by reducing changing ring
Section improves power supply reliability, conversion efficiency, system stability, reduces system cost simultaneously.
The utility model provides a kind of alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier, including microgrid with
AC distribution net, in which:
Interface equipment between microgrid and AC distribution net is a distribution transformer rectifier；
The low-pressure industrial that distribution transformer rectifier is used to for the High Level AC Voltage that AC distribution net inputs being transformed to output is used
The low-voltage DC of alternating current and output；
The low-pressure industrial alternating current and output low-voltage DC of output are mutually isolated；
The low-pressure industrial of output is used to power to AC load with alternating current；
The low-voltage DC of output is used to power to direct current power unit.
The utility model is using the input (exchange 10kV) of distribution transformer rectifier as the microgrid framework of exchange input, general
Logical distribution transformer is changed to distribution transformer rectifier, the structure of the distribution transformer rectifier can using such as application No. is
Structure disclosed in CN201610989970.8 can export mutually isolated AC and DC voltage simultaneously, reduce transform part,
It improves power supply reliability, conversion efficiency, system stability while reducing system cost.When system only need to be to direct current supply
When (such as LED illumination System), then AC system also can be omitted.AC system and the mutually isolated setting of direct current system can make
The reliability of microgrid framework determines by the reliability of the distribution transformer rectifier of transformer, and can greatly improve microgrid framework can
By property.
The alternating current-direct current mixing microgrid framework described in the utility model integrated with distribution transformer rectifier, as preferred side
Formula, direct current power unit include the DC load being arranged in parallel, energy-storage battery and generation of electricity by new energy component.
The alternating current-direct current mixing microgrid framework described in the utility model integrated with distribution transformer rectifier, as preferred side
Formula, direct current power unit includes the DC load being connected with distribution transformer rectifier DC output end, with distribution transformer rectifier
The energy-storage battery and lead to distribution transformer rectifier DC output end that DC output end is connected by two-way non-isolation DC/DC module
Cross the connected generation of electricity by new energy component of non-isolation DC/DC module.
The alternating current-direct current mixing microgrid framework described in the utility model integrated with distribution transformer rectifier, in AC distribution net
In the case where normal power supply, the voltage of direct current power unit is determined by power distribution network by distribution transformer rectifier, in direct current system
The non-isolated two-way DC/DC converter of energy-storage system and the unidirectional DC/DC converter of connection generation of electricity by new energy component are connected in system
DC bus is all accessed with current source mode.When AC distribution net disconnects, the voltage of direct current power unit is by a certain group of energy storage
Battery passes through the non-isolated two-way DC/DC converter being attached thereto and determines that the operating mode of the converter will be switched to voltage source
Mode, the non-isolated two-way DC/DC converter being connected with other energy-storage batteries and is connected non-isolated with generation of electricity by new energy component
Unidirectional DC/DC converter all works under current source mode.This addresses the problem be likely to occur in other schemes because of multiple changes
Parallel operation attempts to control DC voltage and bring system instability problem.After the disconnection of AC distribution net, it is switched to voltage source mould
The non-isolated two-way DC/DC converter of formula will automatically, arbitrarily, uniquely be selected by the electric energy management system of microgrid.
The alternating current-direct current mixing microgrid framework described in the utility model integrated with distribution transformer rectifier, as preferred side
Formula, distribution transformer rectifier include one group of input and three groups of outputs, are inputted as distribution network voltage, and three groups of outputs are respectively that low pressure is handed over
Flow output end, low-voltage direct output end and isolated windings.
The alternating current-direct current mixing microgrid framework described in the utility model integrated with distribution transformer rectifier, as preferred side
Formula, direct current power unit further include a non-isolation DC/AC inverter module, non-isolation DC/AC inverter module both ends respectively with
DC load is connected with isolated windings, the remaining power generation generated when for DC side generated output to be higher than DC side bearing power
Power foldback enters in AC distribution net.Non-isolation DC/AC inverter module is used to be higher than direct current lateral load when DC side generated output
When electric power, residue generated output foldback enter AC network, in order to ensure the isolation of AC system and direct current system, it is non-every
Output from DC/AC inverter module does not return directly to the AC system of green, needs defeated again in distribution transformer rectifier
An isolated windings out, are attached thereto.Non-isolation DC/AC inverter module is not the equipment run always, only works as DC side
There are just operation, the maximum residual power decisions that capacity is likely to occur by system when remaining generated output, rather than load total
Power；Once breaking down, system normal power supply is not directly influenced after excision.
The alternating current-direct current mixing microgrid framework described in the utility model integrated with distribution transformer rectifier, as preferred side
Formula, generation of electricity by new energy component are photovoltaic electrification component.
The utility model in use, when only needing to direct current supply, it is convenient to omit AC system；Work as DC side
When generated output is higher than DC side bearing power, the operation of non-isolation DC/AC inverter module by remaining generated output by isolation around
Group foldback enters AC network.
The utility model can export mutually isolated friendship due to using distribution transformer rectifier in microgrid framework simultaneously
Stream and DC voltage reduce transform part, improve power supply reliability, conversion efficiency, system stability while reducing system
Cost.
The utility model is further equipped with non-isolation DC/AC between distribution transformer rectifier DC output end and DC load
Inverter module is run when DC side has remaining generated output, and remaining generated output is sent into AC network, saves electricity
Energy.In order to ensure the isolation of AC system and direct current system, one isolated windings is set in the output end of distribution transformer rectifier,
So that non-isolation DC/AC inverter module output safety is returned to AC system, improves the stability of system.
Detailed description of the invention
Fig. 1 is that existing microgrid framework unidirectional power flows topological structure schematic diagram.
Fig. 2 is the two-way AC/DC converter topology structural schematic diagram of existing microgrid framework.
Fig. 3 is existing microgrid structure electric power electric transformer topological structure schematic diagram.
Fig. 4 is the alternating current-direct current mixing microgrid fabric topology structural representation integrated with distribution transformer rectifier of the utility model
Figure.
Fig. 5 is 2 microgrid fabric topology structural schematic diagram of embodiment.
Fig. 6 is 3 microgrid fabric topology structural schematic diagram of embodiment.
Appended drawing reference:
100, AC distribution net；200, distribution transformer rectifier；300, AC load；400, direct current power unit.
Specific embodiment
Embodiment 1
As shown in figure 4, a kind of alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier, comprising:
AC distribution net 100: being connected with 200 input terminal of distribution transformer rectifier, for defeated to distribution transformer rectifier 200
Enter High Level AC Voltage；
Distribution transformer rectifier 200: the High Level AC Voltage for inputting AC distribution net 100 is converted into low-voltage AC
And low-voltage DC；Distribution transformer rectifier 200 includes a main winding and three auxiliary winding, is inputted as distribution network voltage, three
Group output is respectively low-voltage alternating-current output end, low-voltage direct output end and isolated windings；
AC load 300: it is connected with low-voltage alternating-current output end；
Direct current power unit 400: being connected with low-voltage direct output end, including by non-isolation DC/AC inverter module with it is low
The DC load for pressing DC output end connected, the energy storage being connected with low-voltage direct output end by two-way non-isolation DC/DC module
Battery and the generation of electricity by new energy component being connected with low-voltage direct output end by non-isolation DC/DC module, wherein generation of electricity by new energy
Component is photovoltaic electrification component；
AC load 300 and the mutually isolated setting of direct current power unit 400.
Embodiment 2
When microgrid framework need to only provide direct current output, as shown in Figure 5, comprising:
AC distribution net 100: being connected with 200 input terminal of distribution transformer rectifier, for defeated to distribution transformer rectifier 200
Enter High Level AC Voltage；
Distribution transformer rectifier 200: the High Level AC Voltage for inputting AC distribution net 100 is converted into low-voltage direct
Electricity；Distribution transformer rectifier 200 includes a main winding and an auxiliary winding, and auxiliary winding is low-voltage direct output end；
Direct current power unit 400: being connected with low-voltage direct output end, for low-voltage DC to be supplied to DC load.
Embodiment 3
When microgrid framework is not necessarily to access generation of electricity by new energy component and energy-storage battery, as shown in Figure 6, comprising:
AC distribution net 100: being connected with 200 input terminal of distribution transformer rectifier, for defeated to distribution transformer rectifier 200
Enter High Level AC Voltage；
Distribution transformer rectifier 200: the High Level AC Voltage for inputting AC distribution net 100 is converted into low-voltage AC
And low-voltage DC；Distribution transformer rectifier 200 includes a main winding and two auxiliary winding, and two auxiliary winding are respectively low pressure
Ac output end and low-voltage direct output end；
AC load 300: it is connected with low-voltage alternating-current output end；
Direct current power unit 400: being connected with low-voltage direct output end, for low-voltage DC to be supplied to DC load；
AC system 300 and the mutually isolated setting of direct current power unit 400.
By taking a small-sized electric vehicle charging station as an example.When contain 8 60kW chargers, overall system capacity 500kVA,
Without energy-storage system and when photovoltaic power generation, the power factor of distribution transformer rectifier is up to 0.99；According to required rectification pulse wave
Harmonics of Input can be restricted to 5% or less by number, distribution transformer rectifier；The transfer efficiency of distribution transformer rectifier is
96%, the DC charging motor transfer efficiency of direct current input is 99%, and such system effectiveness is 95%；The distribution transformer of 500kVA is whole
Stream device about needs 70,000 yuan, and the DC charging motor of 60kW direct current input about needs 2.5 ten thousand yuan, and 8 chargers are 200,000 yuan, system electrical
Equipment total cost is 270,000 yuan.If the transfer efficiency of distribution transformer is 98% using common exchange program.Exchange input
DC charging motor can accomplish power factor 0.99；Current harmonics 5%；Transfer efficiency is 93%, and such system effectiveness is 91%；
The distribution transformer of 500kVA about needs 50,000 yuan, and the DC charging motor of 60kW direct current input about needs 4.8 ten thousand yuan, and 8 chargers are
38.4 ten thousand yuan, system electrical equipment total cost is 43.4 ten thousand yuan.
The two is compared as follows shown in table:
| Item compared | Regular alternating current scheme | 3 scheme of real-time example | Comparison result |
| Power factor | 0.99 | 0.99 | Unanimously |
| Current harmonic content | 5% | 5% | Unanimously |
| System effectiveness | 91% | 95% | Efficiency improves 4%, and loss reduces about half |
| Electrical equipment price | 43.4 ten thousand | 270000 | Cost reduces by 38% |
As can be seen from the table, it is not influencing the stability of system using the technical solution of embodiment 3 while can will damage
Consumption reduces about half, and cost can reduce 38%.
It is described above to be merely exemplary for the utility model, and not restrictive, those of ordinary skill in the art
Understand, without departing from the spirit and scope defined by the claims, any modification, variation or the equivalent shape that can be made
Formula is fallen within the protection scope of utility model.
Claims (9)
1. a kind of alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier, including microgrid and AC distribution net (100),
It is characterized by:
Interface equipment between the microgrid and AC distribution net (100) is a distribution transformer rectifier (200)；
The distribution transformer rectifier (200) is defeated for the High Level AC Voltage that the AC distribution net (100) inputs to be transformed to
The low-voltage DC of low-pressure industrial alternating current and output out；
The low-pressure industrial alternating current and output low-voltage DC of the output are mutually isolated；
The low-pressure industrial of the output is used to power to AC load (300) with alternating current；
The low-voltage DC of the output is used to power to direct current power unit (400).
2. alternating current-direct current mixing microgrid framework according to claim 1, it is characterised in that: the direct current power unit (400)
Including DC load, energy-storage battery and the generation of electricity by new energy component being arranged in parallel.
3. alternating current-direct current mixing microgrid framework according to claim 1, it is characterised in that: the direct current power unit (400)
Including the DC load being connected with distribution transformer rectifier (200) DC output end, with the distribution transformer rectifier
(200) DC output end by two-way non-isolation DC/DC module be connected energy-storage battery and with the distribution transformer rectifier it is straight
It flows output end and passes through the generation of electricity by new energy component that non-isolation DC/DC module is connected.
4. alternating current-direct current mixing microgrid framework according to claim 3, it is characterised in that: when the AC distribution net (100)
When voltage is effective, the voltage of the direct current power unit (400) is only determined by the voltage of the AC distribution net (100), described
Energy-storage battery and the generation of electricity by new energy component all access direct current system with current source mode.
5. alternating current-direct current mixing microgrid framework according to claim 3, it is characterised in that: when the AC distribution net (100)
When voltage disconnects, the two-way non-isolation DC of one of them being connected with energy-storage battery/DC module is worked with voltage source mode, Qi Tayu
The connected two-way non-isolation DC/DC module of energy-storage battery and the generation of electricity by new energy component are all used with current source mode access direct current
Electric unit (400).
6. alternating current-direct current mixing microgrid framework according to claim 5, it is characterised in that: when the AC distribution net (100)
When voltage disconnects, the two-way non-isolation DC/DC module that with energy-storage battery is connected of the selected work under voltage source mode is
It is arbitrarily designated automatically by electric energy management system.
7. alternating current-direct current mixing microgrid framework according to claim 3, it is characterised in that: the distribution transformer rectifier
It (200) include one group of input and three groups of mutually isolated outputs；The input is connected with AC distribution net (100) voltage；
Three mutually isolated outputs are respectively used to generate low-voltage alternating-current output end, low-voltage direct output end and isolated windings.
8. alternating current-direct current mixing microgrid framework according to claim 7, it is characterised in that: the direct current power unit (400)
Further include a non-isolation DC/AC inverter module, the non-isolation DC/AC inverter module both ends respectively with the DC load
It is connected with the isolated windings, the remaining generated output generated when for DC side generated output to be higher than DC side bearing power
Foldback enters in the AC distribution net (100).
9. alternating current-direct current mixing microgrid framework according to claim 2 or 3, it is characterised in that: the generation of electricity by new energy component
For photovoltaic electrification component.
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| CN201920168585.6U CN209709691U (en) | 2019-01-31 | 2019-01-31 | The alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687463A (en) * | 2019-01-31 | 2019-04-26 | 上海泓语电气技术有限公司 | The alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier |
| CN111987790A (en) * | 2020-08-11 | 2020-11-24 | 云南电网有限责任公司丽江供电局 | Power taking device in ring main unit |
-
2019
- 2019-01-31 CN CN201920168585.6U patent/CN209709691U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687463A (en) * | 2019-01-31 | 2019-04-26 | 上海泓语电气技术有限公司 | The alternating current-direct current mixing microgrid framework integrated with distribution transformer rectifier |
| CN109687463B (en) * | 2019-01-31 | 2023-10-03 | 上海泓语电气技术有限公司 | AC/DC hybrid micro-grid structure integrated with distribution transformer rectifier |
| CN111987790A (en) * | 2020-08-11 | 2020-11-24 | 云南电网有限责任公司丽江供电局 | Power taking device in ring main unit |
| CN111987790B (en) * | 2020-08-11 | 2024-02-20 | 云南电网有限责任公司丽江供电局 | Get electric installation in looped netowrk cabinet |
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Effective date of registration: 20230224 Address after: 518063 383, Phase I, Huiheng Building, 138 Gaoxin South 7th Road, High-tech Zone Community, Yuehai Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Lvdian DC Electrical Technology Co.,Ltd. Address before: Room 1410, Building 3, No. 2388, Xiupu Road, Pudong New Area, Shanghai, 201315 Patentee before: SHANGHAI HONYO ELECTRIC Co.,Ltd. |
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