CN205646811U - Photovoltaic directly exchanges and mixes little grid system - Google Patents
Photovoltaic directly exchanges and mixes little grid system Download PDFInfo
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- CN205646811U CN205646811U CN201620478323.6U CN201620478323U CN205646811U CN 205646811 U CN205646811 U CN 205646811U CN 201620478323 U CN201620478323 U CN 201620478323U CN 205646811 U CN205646811 U CN 205646811U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model discloses a photovoltaic directly exchanges and mixes little grid system, including the dc bus, photovoltaic power generation unit, the commercial power electric wire netting, the energy storage unit, UPS, the DC load, alternating load and control unit, photovoltaic power generation unit is connected to the dc bus through first one -way DCDC converter, the commercial power electric wire netting is connected to the dc bus through two -way ACDC converter, the energy storage unit is connected to the dc bus through two -way DCDC converter, the DC load is connected to the dc bus through the one -way DCDC converter of second, UPS's input is connected to dc bus and commercial power electric wire netting, the alternating load is connected to UPS's output, the first one -way DCDC converter of control unit communication connection, two -way ACDC converter, two -way DCDC converter, one -way DCDC converter of second and UPS, it runs without interruption for a long time to maintain the alternating load through UPS, the alternating load power supply is maintain to photovoltaic power generation unit and energy storage unit accessible UPS direct current side from the net time.
Description
Technical field
This utility model relates to a kind of network system, particularly relates to a kind of photovoltaic orthogonal stream mixing micro-grid system.
Background technology
Along with the quick growth of national economy, electricity needs increases very fast, double in energy demand and environmental conservation
Under weight power, the most more sight has been invested can improve traditional energy utilization ratio again can fully profit
With the distributed power generation correlative technology field of various regenerative resources.But distributed generation technology have voltage instability,
The drawbacks such as power swing is big, can produce serious influence to residential electricity consumption, the safety of higher level's electrical network and peak regulation.
Micro-capacitance sensor technology solves distributed generation technology drawback well.Micro-capacitance sensor refer to by distributed power source,
Small-sized the distribution system that energy conversion device, load, monitoring and protection device etc. are collected, is an energy
Enough realize the autonomous system of self-contr ol and management.
At present, micro-capacitance sensor can be divided into exchange micro-capacitance sensor, direct-current grid and alternating current-direct current mixing micro-capacitance sensor.Alternating current-direct current
Mixing micro-capacitance sensor not only contain ac bus but also had contained dc bus, not only can directly power to AC load but also permissible
Directly powering to DC load, but analyze from overall structure, traditional alternating current-direct current mixing micro-capacitance sensor is substantially
Still falling within exchange micro-capacitance sensor, direct-current grid is simply regarded as a unique power supply and is connect by electronic power inverter
Enter ac bus.
Therefore, it is necessary to propose the scheme of a kind of photovoltaic orthogonal stream mixing micro-grid system, it is with DC micro-electric
Based on net system, expand to orthogonal stream mixing micro-grid system, both there is direct-current grid controllability height, effect
The high advantage of rate provides the electric energy of necessity for DC load, can guarantee that again the uninterrupted operation of exchange important load,
And this also will greatly promote distributed photovoltaic power generation technology and the popularization and application of DC micro-electric network technology.
Utility model content
This utility model provides a kind of photovoltaic orthogonal stream mixing micro-grid system, which overcomes institute in background technology
The deficiencies in the prior art stated.
This utility model solves its technical problem and be the technical scheme is that
A kind of photovoltaic orthogonal stream mixing micro-grid system, it includes dc bus, photovoltaic generation unit, civil power electricity
Net, energy-storage units, DC load and monitoring unit, described photovoltaic generation unit passes through the first unidirectional DC/DC
Changer is connected to dc bus, and described utility grid is connected to dc bus by two-way AC/DC changer,
Described energy-storage units is connected to dc bus by two-way DC/DC changer, and described DC load passes through second
Unidirectional DC/DC changer is connected to dc bus, and described monitoring unit communicates to connect the first unidirectional DC/DC
Changer, two-way AC/DC changer, two-way DC/DC changer and the second unidirectional DC/DC changer；
Also include that UPS and AC load, the input of described UPS are connected to dc bus and utility grid, described
The outfan of UPS connects AC load, and described monitoring unit also communicates to connect UPS.
Among one embodiment: also include the big capacity electrolyte capacitor for balancing DC bus-bar voltage.
Among one embodiment: be connected between the input of described UPS and dc bus and have a check diode, should
The cut-off end correspondence of check diode connects the input of UPS.
Among one embodiment: described first unidirectional DC/DC changer has MPPT controller.
Among one embodiment: described energy-storage units is lithium battery.
Among one embodiment: described monitoring unit communicates to connect the first unidirectional DC/DC by CAN
Changer, two-way AC/DC changer, two-way DC/DC changer, the second unidirectional DC/DC changer and
UPS。
The technical program is compared with background technology, and it has the advantage that
1, photovoltaic orthogonal stream mixing micro-grid system described in the utility model is rationally distributed, including photovoltaic generation
The multiple generator unit of unit, utility grid, energy-storage units and monitoring unit, according to the needs of practical situation,
Intelligent set system can be in grid-connected or islet operation pattern.
2, this utility model system utility grid when grid-connected maintains AC load the most uninterrupted by UPS
Run；When off-network, photovoltaic generation unit and energy-storage units can maintain AC load to power by UPS DC side.
3, this utility model system can carry out reasonable employment to distributed photovoltaic power generation unit and energy-storage units,
System maintains stablizing of DC bus-bar voltage by big capacity electrolyte capacitor, improves the power supply reliability of system,
Ensure that the stable operation of DC load.
Accompanying drawing explanation
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Fig. 1 depicts the structural representation of a kind of photovoltaic orthogonal stream mixing micro-grid system described in the present embodiment.
Detailed description of the invention
Refer to Fig. 1, a kind of photovoltaic orthogonal stream mixing micro-grid system, it includes dc bus 10, and photovoltaic is sent out
Electric unit 21, utility grid 22, energy-storage units 23, DC load 31, AC load 32, monitoring unit
(not shown) and UPS41 (uninterrupted power source).
Described photovoltaic generation unit 21 is connected to dc bus by the first unidirectional DC/DC changer 11, should
Photovoltaic generation unit 21 includes photovoltaic array device, and this first unidirectional DC/DC changer 11 has MPPT
Controller, MPPT i.e. MPPT maximum power point tracking, at a certain temperature and irradiance, photovoltaic array device exists
One maximum power point, follows the tracks of this maximum power point constantly by this MPPT controller, it is possible to obtain maximum
Efficiency.The most common MPPT algorithm has observation method of perturbation, conductance increment method etc..
Described utility grid 22 is connected to dc bus, two-way AC/DC by two-way AC/DC changer 12
The DC side of changer 12 is connected with dc bus 10, and AC is connected with utility grid 22；Described energy storage
Unit 23 is connected to dc bus 10 by two-way DC/DC changer 13；Described DC load 31 is passed through
Second unidirectional DC/DC changer 14 is connected to dc bus 10；The input of described UPS41 is connected to directly
Stream bus 10 and utility grid 22, the outfan of described UPS41 connects AC load 32, this AC load
32 do not allow power-off to need the important AC load of continued power often, i.e. allow UPS41 by dc bus
10 and utility grid 22 two ways power, thus ensure the uninterrupted operation of important AC load 32.
Described monitoring unit communicate to connect the first unidirectional DC/DC changer 11, two-way AC/DC changer 12,
Two-way DC/DC changer the 13, second unidirectional DC/DC changer 14 and UPS, monitoring unit is supervised in real time
Survey the running status of each energy converter, utilize different control strategies, become by controlling two-way AC/DC
Parallel operation 12 realizes the switching of system grid connection and two kinds of methods of operation of isolated island, by controlling two-way DC/DC changer
13, the first unidirectional DC/DC changer 11 realizes the phase between photovoltaic generation unit 11 with energy-storage units 13
Cooperation mutually, improves power supply reliability, ensures the uninterrupted fortune of important AC load by controlling UPS41
OK.In the present embodiment, described monitoring unit by CAN communicate to connect the first unidirectional DC/DC changer,
Two-way AC/DC changer, two-way DC/DC changer, the second unidirectional DC/DC changer and UPS.
Preferably, this utility model system also includes the big capacity electrolyte capacitor for balancing DC bus-bar voltage
51, keep the constant of DC bus-bar voltage by this big capacity electrolyte capacitor 51.
Preferably, it is connected between the input of described UPS41 with dc bus 10 and has a check diode 61,
The cut-off end correspondence of this check diode 61 connects the input of UPS41, it is to avoid this UPS41 is to direct current
The impact of bus bar side.
In the present embodiment, described energy-storage units 23 is lithium battery.
Described dc bus rated voltage is preferably 380VDC, for the DC bus-bar voltage generally acknowledged the most in the world
Suggestion grade.This utility model DC bus-bar voltage fluctuation ± 5%, i.e. magnitude of voltage is at 360VDC-400VDC
Between.Described utility grid side has ac bus, and the rated voltage of ac bus voltage is preferably 380VAC,
While being suitable for major part household electrical appliance rated voltage, also coordinate mutually with DC bus-bar voltage.
Under cutting-in control pattern, when the generated energy of photovoltaic generation unit 21 is more than bearing power and energy-storage units
23 charge requirement time, DC bus-bar voltage rise, two-way AC/DC changer 12 is in inverter mode,
Energy is flowed to utility grid by dc bus 10, and the first unidirectional DC/DC changer 11 is in MPPT mould
Formula, if energy-storage units 23 is in underfill state, is energy-storage units by two-way DC/DC changer 13
23 chargings, after energy-storage units 23 is fully charged, will control it and not charge, simultaneously by big capacity electrolyte capacitor 51
Maintenance busbar voltage is constant, and important AC load is connected utility grid 22 by UPS41 and powers；
When the generated energy of photovoltaic generation unit 21 is less than the charge requirement of bearing power and energy-storage units 23, directly
Stream busbar voltage reduces, and two-way AC/DC changer 12 is in rectification state, and energy is flowed by utility grid 22
To dc bus 10, the first two-way DC/DC changer 11 is in MPPT pattern, if energy-storage units 23
When being in underfill state, charged for energy-storage units 23 by two-way DC/DC changer 13, treat energy storage list
After unit 23 is fully charged, will be controlled it and do not charge, be maintained DC bus-bar voltage by big capacity electrolyte capacitor 51 simultaneously
Constant, important AC load is connected utility grid 22 by UPS41 and powers；
When utility grid 22 fault, system islet operation, transfer off-network control model to, when photovoltaic generation list
When the generated energy of unit 21 is less than bearing power, DC bus-bar voltage reduces, and energy-storage units 23 is by two-way
DC/DC changer 13 is powered for DC load 31, gives important by dc bus 10 through UPS41 simultaneously
AC load is powered, it is ensured that the uninterrupted operation of important AC load.
The above, only this utility model preferred embodiment, therefore it is real to limit this utility model according to this
The scope executed, the equivalence change i.e. made according to this utility model the scope of the claims and description and modification, all should
Still belong in the range of this utility model contains.
Claims (6)
1. a photovoltaic orthogonal stream mixing micro-grid system, including dc bus, photovoltaic generation unit, civil power electricity
Net, energy-storage units, DC load and monitoring unit, described photovoltaic generation unit passes through the first unidirectional DC/DC
Changer is connected to dc bus, and described utility grid is connected to dc bus by two-way AC/DC changer,
Described energy-storage units is connected to dc bus by two-way DC/DC changer, and described DC load passes through second
Unidirectional DC/DC changer is connected to dc bus, and described monitoring unit communicates to connect the first unidirectional DC/DC
Changer, two-way AC/DC changer, two-way DC/DC changer and the second unidirectional DC/DC changer；
It is characterized in that: also include that UPS and AC load, the input of described UPS are connected to dc bus and city
Electricity electrical network, the outfan of described UPS connects AC load, and described monitoring unit also communicates to connect UPS.
A kind of photovoltaic orthogonal stream mixing micro-grid system the most according to claim 1, it is characterised in that: also
Including the big capacity electrolyte capacitor for balancing DC bus-bar voltage.
A kind of photovoltaic orthogonal stream mixing micro-grid system the most according to claim 1, it is characterised in that: institute
State to be connected between the input of UPS and dc bus and have a check diode, the cut-off end pair of this check diode
The input of UPS should be connected.
A kind of photovoltaic orthogonal stream mixing micro-grid system the most according to claim 1, it is characterised in that: institute
State the first unidirectional DC/DC changer and there is MPPT controller.
A kind of photovoltaic orthogonal stream mixing micro-grid system the most according to claim 1, it is characterised in that: institute
Stating energy-storage units is lithium battery.
A kind of photovoltaic orthogonal stream mixing micro-grid system the most according to claim 1, it is characterised in that: institute
State described monitoring unit and communicate to connect the first unidirectional DC/DC changer, two-way AC/DC by CAN
Changer, two-way DC/DC changer, the second unidirectional DC/DC changer and UPS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620478323.6U CN205646811U (en) | 2016-05-24 | 2016-05-24 | Photovoltaic directly exchanges and mixes little grid system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620478323.6U CN205646811U (en) | 2016-05-24 | 2016-05-24 | Photovoltaic directly exchanges and mixes little grid system |
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| CN205646811U true CN205646811U (en) | 2016-10-12 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712091A (en) * | 2017-01-20 | 2017-05-24 | 厦门大学 | Novel alternating current and direct current hybrid micro-grid system and control strategy thereof |
| CN107257160A (en) * | 2017-06-30 | 2017-10-17 | 深圳奥特迅电力设备股份有限公司 | A kind of DC operation power supply system and its control method |
| CN109193613A (en) * | 2018-09-03 | 2019-01-11 | 深圳供电局有限公司 | A kind of DC micro power grid system and its control method |
| CN110138014A (en) * | 2019-06-18 | 2019-08-16 | 深圳市尚科新能源有限公司 | The integrated solar power generation subsystem of grid-connected off-network and system |
| CN110247432A (en) * | 2019-07-09 | 2019-09-17 | 江苏大航微电网科技有限公司 | A kind of intelligent micro-grid |
| CN110350560A (en) * | 2019-07-09 | 2019-10-18 | 江苏大航微电网科技有限公司 | A kind of intelligent micro-grid control device |
| CN113692684A (en) * | 2019-02-12 | 2021-11-23 | 埃莱克赛斯Ip有限公司 | System and method for managing power |
| CN114342210A (en) * | 2019-09-12 | 2022-04-12 | Abb瑞士股份有限公司 | Uninterruptible Power Supply (UPS) for connecting multiphase load to Alternating Current (AC) power source and Direct Current (DC) power source |
| CN114914919A (en) * | 2021-02-07 | 2022-08-16 | 周雅娟 | Light storage integrated power supply system and control method |
| CN116154974A (en) * | 2023-04-23 | 2023-05-23 | 杭州欣美成套电器制造有限公司 | Micro-grid monitoring system for electric micro-grid |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712091A (en) * | 2017-01-20 | 2017-05-24 | 厦门大学 | Novel alternating current and direct current hybrid micro-grid system and control strategy thereof |
| CN107257160A (en) * | 2017-06-30 | 2017-10-17 | 深圳奥特迅电力设备股份有限公司 | A kind of DC operation power supply system and its control method |
| CN107257160B (en) * | 2017-06-30 | 2023-07-28 | 深圳奥特迅电力设备股份有限公司 | DC operation power supply system and control method thereof |
| CN109193613A (en) * | 2018-09-03 | 2019-01-11 | 深圳供电局有限公司 | A kind of DC micro power grid system and its control method |
| CN109193613B (en) * | 2018-09-03 | 2022-01-18 | 深圳供电局有限公司 | Direct-current micro-grid system and control method thereof |
| CN113692684A (en) * | 2019-02-12 | 2021-11-23 | 埃莱克赛斯Ip有限公司 | System and method for managing power |
| CN110138014A (en) * | 2019-06-18 | 2019-08-16 | 深圳市尚科新能源有限公司 | The integrated solar power generation subsystem of grid-connected off-network and system |
| CN110138014B (en) * | 2019-06-18 | 2022-11-29 | 深圳市尚科新能源有限公司 | Grid-connected and off-grid integrated solar power generation subsystem and system |
| CN110350560A (en) * | 2019-07-09 | 2019-10-18 | 江苏大航微电网科技有限公司 | A kind of intelligent micro-grid control device |
| CN110247432A (en) * | 2019-07-09 | 2019-09-17 | 江苏大航微电网科技有限公司 | A kind of intelligent micro-grid |
| CN114342210A (en) * | 2019-09-12 | 2022-04-12 | Abb瑞士股份有限公司 | Uninterruptible Power Supply (UPS) for connecting multiphase load to Alternating Current (AC) power source and Direct Current (DC) power source |
| CN114342210B (en) * | 2019-09-12 | 2024-04-16 | Abb瑞士股份有限公司 | Uninterruptible Power Supply (UPS) for connecting multiphase loads to AC power source and DC power source |
| CN114914919A (en) * | 2021-02-07 | 2022-08-16 | 周雅娟 | Light storage integrated power supply system and control method |
| CN116154974A (en) * | 2023-04-23 | 2023-05-23 | 杭州欣美成套电器制造有限公司 | Micro-grid monitoring system for electric micro-grid |
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