CN110336310A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN110336310A CN110336310A CN201910555124.9A CN201910555124A CN110336310A CN 110336310 A CN110336310 A CN 110336310A CN 201910555124 A CN201910555124 A CN 201910555124A CN 110336310 A CN110336310 A CN 110336310A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000004146 energy storage Methods 0.000 claims abstract description 48
- 230000005611 electricity Effects 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 description 10
- 230000006978 adaptation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/383—
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
- H02J2310/12—The local stationary network supplying a household or a building
- H02J2310/14—The load or loads being home appliances
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides an air conditioning system and a control method of the air conditioning system. The air conditioning system comprises an alternating current rectifier, a direct current air conditioner, a photovoltaic battery pack, a direct current power supply end, an energy storage battery and a DC/AC converter. The alternating current end of the alternating current rectifier is used for being connected with an alternating current power grid, and the direct current air conditioner is connected with the direct current end of the alternating current rectifier through a direct current bus. The photovoltaic battery pack, the direct current power supply end and the energy storage battery are respectively connected with the direct current bus, the photovoltaic battery pack and the direct current power supply end are used for supplying power to the direct current bus, and the energy storage battery is used for supplying power to the direct current bus or storing electricity from the direct current bus. The direct current bus is also connected with an alternating current power grid through a DC/AC converter, and the direct current bus supplies power to the alternating current power grid through the DC/AC converter. The invention can realize the combined input of alternating current energy, direct current energy and photovoltaic energy of the air conditioning system, provides a plurality of energy modes for the air conditioner at the same time, is convenient for users to flexibly select and configure according to the needs, and simultaneously enhances the energy-saving effect and the flexibility of energy utilization.
Description
Technical field
The present invention relates to technical field of refrigeration equipment, in particular to the control of a kind of air-conditioning system and air-conditioning system
Method.
Background technique
Traditional inverter and power load exchanging end carry out it is in parallel, there are the waste of the two times transfer of using energy source, with
And the energy flows to uncontrollable, can not be with the coordination and response of local power load the problem of.For this purpose, distributed local energy source interconnection
Net provides a kind of good mode for the in-site collecting of new energy and consumption.Photovoltaic directly drives air-conditioning technical in this convenient application
Play good exemplary role, it is obvious that photovoltaic directly drives technical energy saving effect, quickly grows.
Currently, the demand that air-conditioning carries out photovoltaic directly drive is huge, and demand differenceization is larger, if for not of the same race
The air-conditioning of class and watt level all carries out the research and development that photovoltaic directly drives, and development will be very huge, be unable to satisfy the needs in market.
Still further aspect, DC distribution technology is rapid in developed recently, and the demand to air-conditioning direct current increases.
And existing air-conditioning system is difficult to be compatible with the use of above-mentioned PV air-conditioner and direct-flow air conditioner, is not able to satisfy client's
The use demand of diversification.
Summary of the invention
It is hollow to solve the prior art the embodiment of the invention provides a kind of air-conditioning system and the control method of air-conditioning system
The technical issues of use of PV air-conditioner and direct-flow air conditioner cannot be compatible with existing for adjusting system.
The application embodiment provides a kind of air-conditioning system, and air-conditioning system includes: AC adapter 10, AC adapter
10 exchange end with AC network a for being connected；Direct-flow air conditioner passes through DC bus b phase with the DC terminal of AC adapter 10
Even；Photovoltaic cell group is connected with DC bus b, for powering to DC bus b；DC power supply terminal is connected with DC bus b,
For powering to DC bus b；The port of energy-storage battery, energy-storage battery is connected with DC bus b, and energy-storage battery is used for direct current
Bus b power supply or from DC bus b storage；DC/AC current transformer, DC bus b also pass through DC/AC current transformer and AC network a
It is connected, DC bus b powers to AC network a by DC/AC current transformer.
Embodiment further provides a kind of control methods of air-conditioning system by the application, and control method is for controlling claim
1 air-conditioning system, control method include: to be powered that direct-flow air conditioner is allowed to work to DC bus b by photovoltaic cell group；If
The virtual voltage VDC of DC bus is less than first predetermined value V1, then is powered by energy-storage battery to DC bus b；If direct current
The virtual voltage VDC of bus is still less than first predetermined value V1, then is powered by DC power supply terminal to DC bus b.
In one embodiment, control method include: DC bus b is powered by photovoltaic cell group allow it is straight
After flowing air-conditioning work, if the virtual voltage VDC of DC bus is greater than second predetermined value V2, pass through DC/AC current transformer pair
AC network a power supply.
In one embodiment, direct-flow air conditioner is allowed to work it being powered by photovoltaic cell group to DC bus b
Before, it first passes through the alternating current that AC adapter 10 converts in AC network a and powers to DC bus b, by the reality of DC bus
Voltage VDC maintains third predetermined value V3.
In one embodiment, direct-flow air conditioner is allowed to work it being powered by photovoltaic cell group to DC bus b
Afterwards, if the virtual voltage VDC of DC bus is greater than the 4th predetermined value V4, stop AC adapter 10 and convert AC network a
In alternating current to DC bus b power.
In one embodiment, if the virtual voltage VDC of DC bus is greater than the 4th predetermined value V4, also pass through DC/
AC current transformer maintains the virtual voltage VDC of DC bus between the 4th predetermined value V4 and second predetermined value V2.
In one embodiment, control method includes: to adjust photovoltaic cell group to direct current by unidirectional DC/DC module 50
The output voltage of bus b.
In one embodiment, control method includes: to adjust DC power supply terminal to direct current by direct current protecting module 60
The output voltage of bus b.
In one embodiment, control method includes: to adjust energy-storage battery to DC bus by two-way DC/DC module
The supply voltage of b, or DC bus b is adjusted to the charging voltage of energy-storage battery.
In one embodiment, control method includes: by adjusting the load of direct-flow air conditioner to be adapted to DC bus
Virtual voltage.
In the above-described embodiments, the alternative energy sources, DC energy source, the combination of photovoltaic energy that air-conditioning system may be implemented are defeated
Enter, provides various energy resources mode simultaneously for air-conditioning, the flexible selection and deployment for facilitating user as needed, while enhancing energy-saving effect
With the flexibility of using energy source.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the overall structure diagram of the embodiment of air-conditioning system according to the present invention；
Fig. 2 is the flow diagram of the control method of the air-conditioning system of Fig. 1.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
Traditional photovoltaic directly drives air-conditioning technical and generally passes through photovoltaic cell group generation direct current, carries out work to driving air-conditioning
Make.The use that the photovoltaic directly drives air-conditioning technical will receive the influence such as environmental factor and battery storage factor, and use limited.It is existing
Direct-flow air conditioner be then to be driven using direct current, direct-flow air conditioner simultaneously do not have energy-saving and environment-friendly effect.
The present invention is directed to directly drive technical solution in parallel by direct current, combined by modular interface, realization PV air-conditioner,
Direct-flow air conditioner, the compatibility and modular combination for exchanging air-conditioning, provide the mode that various energy resources are incorporated to for air-conditioning equipment, make full use of
Solar energy, energy conservation and environmental protection.
Fig. 1 shows the embodiment of air-conditioning system of the invention, which includes AC adapter 10, direct current sky
Tune, photovoltaic cell group, DC power supply terminal, energy-storage battery and DC/AC current transformer.The exchange end of AC adapter 10 is used for and exchanges
Power grid a is connected, and direct-flow air conditioner is connected with the DC terminal of AC adapter 10 by DC bus b.Photovoltaic cell group, direct current supply
End and energy-storage battery are connected with DC bus b respectively, and photovoltaic cell group and DC power supply terminal are used to power to DC bus b, storage
Can battery be used to power to DC bus b or from DC bus b storage.DC bus b also passes through DC/AC current transformer and alternating current
It nets a to be connected, DC bus b powers to AC network a by DC/AC current transformer.
It applies the technical scheme of the present invention, direct-flow air conditioner may be implemented by powering to DC bus b in photovoltaic cell group
The first is driven by electricity the method for operation；AC network a can power to DC bus b by the conversion of AC adapter 10, with reality
Second of existing direct-flow air conditioner is driven by electricity the method for operation；Direct current may be implemented by powering to DC bus b in DC power supply terminal
The third of air-conditioning is driven by electricity the method for operation；The of direct-flow air conditioner may be implemented by powering to DC bus b in energy-storage battery
Four kinds are driven by electricity the method for operation.
Above-mentioned four kinds are driven by electricity the method for operation, and the alternative energy sources, DC energy source, photovoltaic energy of air-conditioning system may be implemented
The combination in source inputs, and provides various energy resources mode simultaneously for air-conditioning, and the flexible selection and deployment for facilitating user as needed increases simultaneously
The flexibility of strong energy-saving effect and using energy source.
In addition, the extra electricity generated on DC bus b can be conveyed to AC network a by DC/AC current transformer.
For example, after direct-flow air conditioner stops working, if energy-storage battery has been also filled with electricity, so that it may by photovoltaic battery pack for power generation inversion
Present net.
It should be noted that above-mentioned four kinds are driven by electricity the method for operation, can be selected according to specific electricity needs
Direct-flow air conditioner is driven by electricity the operation of one of method of operation with above-mentioned four kinds, or is transported in a manner of a variety of be driven by electricity simultaneously
Row.
It should also be noted that, direct current supply port can be provided after DC frequency converting air-conditioner apolegamy direct current protecting module, directly
Receive the power supply of DC distribution net.Direct current protecting module provides the charging soft start function of direct current initial power-on DC bus, with
And Current Voltage monitoring and the defencive function of route.The AC adapter of DC frequency converting air-conditioner apolegamy corresponding power grade.It can be with
It is used as exchange air-conditioning, it is consistent with traditional air conditioner power mode.
More preferably, air-conditioning system further includes unidirectional DC/DC module, and the first port of photovoltaic cell group passes through unidirectional
DC/DC module is connected with DC bus b.When in use, unidirectional DC/DC module is used to adjust the output voltage of photovoltaic cell, with
So that the voltage adaptation that photovoltaic cell group generates is in the power supply of DC bus b.More preferably, air-conditioning system further includes that direct current is protected
Module is protected, DC power supply terminal is connect by direct current protecting module with DC bus b.When in use, unidirectional DC/DC module can benefit
Accessed with photovoltaic battery pack direct current, it is mating with energy-storage battery and other modules, photovoltaic energy completely internal system storage and
It uses, does not feed back to AC network.In addition, direct current protecting module is the protection device of direct current supply port, it is capable of providing direct current
The charging soft start of access and protection and the fault detection alarm of Current Voltage.Match two-way DC/DC module and energy storage electricity
Pond, unidirectional DC/DC module and photovoltaic power generation array, convenient, flexible building off-network light storage integrated system or.Match unidirectional DC/DC
Module and photovoltaic power generation array, convenient, flexible building off-network light storage integrated system or.
As a kind of more preferably embodiment, as shown in Figure 1, air-conditioning system further includes two-way DC/DC module, energy storage
The port of battery is connected by two-way DC/DC module with DC bus b.When in use, when energy-storage battery is used for DC bus b
When power supply, two-way DC/DC module is for adjusting energy-storage battery to the supply voltage of DC bus b；When energy-storage battery is used for from straight
When flowing bus b storage, two-way DC/DC module is for adjusting DC bus b to the charging voltage of energy-storage battery.Two-way DC/DC mould
Block and energy-storage battery can multiple modules in parallel input fluctuation and each module of each module according to DC bus b voltage pass through it is total
The real-time status of line communication data feedback, realizes the linkage control of each module, avoids the circulation problem of energy-storage module.
As shown in Figure 1, in the technical scheme of this embodiment, second port and the DC/AC current transformer phase of photovoltaic cell group
First diode D1 is provided on flow path even, and first diode D1 is from the second port of photovoltaic cell group to DC/AC current transformer
Individual event conducting.More preferably, the second port of photovoltaic cell group is connected with DC bus b, the second port of photovoltaic cell group
The second diode D2, the second diode D2 is provided on the flow path being connected with DC bus b by the second port of photovoltaic cell group
It is connected to DC bus b individual event.By first diode D1 and the second diode D2, may be implemented to the opposite of DC bus b
Isolation avoids the equal flow problem of bidirectional converter, and the circulation problem constituted with rectifier.
In the technical scheme of this embodiment, first diode D1 and the second diode D2 are only relative to DC/AC current transformer
It erects and sets, in other optional embodiments, first diode D1 and the second diode D2 can also be integrated in DC/AC
The inside of current transformer.
In the technical scheme of this embodiment, because mainly wanting to realize power-generation inversion feedback net, become using individual event DC/AC
Flow device.In addition it is also possible to other than realizing power-generation inversion feedback net, can also be realized by double using two-way DC/AC current transformer
It powers to DC/AC to DC bus b, and two-way DC/AC current transformer is able to achieve the MPPT tracking maximum of photovoltaic cell group direct current
Power points.Since photovoltaic battery pack for power generation ability is laid with area effect, in order to increase flexibility, digital control system allocation by photovoltaic panel
The configuration power of two-way DC/AC current transformer can be with flexible choice, such as 10KW or 20KW.Due to using isolation scheme, solution
It has determined circulation, the technical issues of flowing, therefore 2 or more two-way DC/AC current transformer Parallel Controls can have been matched simultaneously,
Meet different configuration needs.The compatible control that photovoltaic directly drives air-conditioning with exchange air-conditioning may be implemented in the configuration, and control method is such as
Under: photovoltaic has input+DC load to open --- and-two-way DC/AC current transformer control inversion function is closed, and the photovoltaic power generation energy mentions
For directly driving the energy；Photovoltaic has input+DC load to close --- and-two-way DC/AC current transformer control inversion function is opened, photovoltaic hair
Electric energy feedback grid；Photovoltaic is opened without input+DC load --- and-two-way DC/AC current transformer inversion function is closed, by exchanging
Rectifier provides alternative energy sources for load.Meanwhile photovoltaic power generation array is accessed first diode after unidirectional DC/DC module
The common point of D1 and the second diode D2, can larger promote photovoltaic efficiency.
Optionally, above-mentioned each module can be communicated with CAN bus, and each module respectively sends oneself state and data, be received
The data of other modules of system realize convenient, flexible system building.
It should also be noted that, above-mentioned each module can be individually present, it can also be with function integrated combination together.
In addition it is also necessary to explanation, traditional photovoltaic directly drives air-conditioning technical with AC adapter and DC frequency-changing pressure
Two major part of contracting machine driver is integrated.The present invention is on this basis using rectifier and DC frequency-changeable compressor driver as two
A independent module, i.e. AC adapter module 10 and direct-flow air conditioner, while " DC+ " and " DC- " of open DC bus b, can
To allow the access of other DC energy sources.
Air-conditioning system of the invention can construct as follows:
1, DC frequency converting air-conditioner is chosen, two-way DC/DC module and energy-storage battery, unidirectional DC/DC module and photovoltaic hair are matched
Electric array, convenient, flexible building off-network light storage integrated system or.
2, two-way DC/DC module and energy-storage battery can multiple modules in parallel input each module according to DC bus b voltage
Fluctuation and each module pass through the real-time status of bus communication data feedback, realize the linkage control of each module, avoid energy storage mould
The circulation problem of block.
1. being inputted as the control of DC bus b voltage in 600V, DC load power is constant under stable state in photovoltaic power generation
Power increases, and DC bus b voltage is increased to 605V, if energy-storage battery reduces discharge power in discharge condition；If storage
Energy battery then increases charge power in charged state., whereas if photovoltaic power generation input power reduces, then DC bus b voltage
After being reduced to 595V, energy-storage battery increases discharge power；If photovoltaic cell group is discharged by energy-storage battery without output and provides energy
Source.
2. if DC frequency converting air-conditioner needs to improve frequency and increases power, by issuing demand on the data bus in advance,
Energy-storage battery block is ready, and is opened energy storage if DC bus b voltage starts to be reduced to 595V and is stepped up discharge power.
The amplitude that DC frequency converting air-conditioner increases or decreases power is limited in 500W/s hereinafter, ensureing the stationarity of DC bus b control.
3. if DC frequency converting air-conditioner needs to reduce frequency and reduces power, by issuing demand on the data bus in advance,
Energy-storage battery is ready, and is opened energy storage if DC bus b voltage starts to be increased to 605V and is stepped up charge power.Directly
The amplitude that stream convertible frequency air-conditioner increases or decreases power is limited in 500W/s hereinafter, ensureing the stationarity of bus control.
As shown in the above, air-conditioning system of the invention realizes following technical effect:
1, by standardized module interface, the input in parallel of the various energy resources of DC frequency converting air-conditioner is realized；
2, by first diode D1 and the second diode D2 isolated DC bus b, prevent the shunting unevenness of each module from asking
Topic.
3, dereliction bus marco strategy realizes the Optimum utilization strategy of the energy, controls energy using the voltage change of DC bus
Current power flow direction between source module.
As shown in Fig. 2, the control method includes: to pass through light the present invention also provides a kind of control method of air-conditioning system
Volt battery pack, which is powered DC bus b, allows direct-flow air conditioner to work；If the virtual voltage VDC of DC bus is pre- less than first
Definite value V1 then powers to DC bus b by energy-storage battery；If the virtual voltage VDC of DC bus is still pre- less than first
Definite value V1 then powers to DC bus b by DC power supply terminal.When in use, DC bus b is carried out by photovoltaic cell group
Power supply illustrates the energy of photovoltaic cell group offer not if the virtual voltage VDC of DC bus is less than first predetermined value V1
It is enough, then it enables energy-storage battery and powers to DC bus b.If the virtual voltage VDC of DC bus is still less than first predetermined value
V1 then illustrates that the energy provided is still inadequate, then enables DC power supply terminal and energy-storage battery again and power together to DC bus b,
To meet requirement.Since the energy in energy-storage battery is from photovoltaic cell group, compared to the energy in DC power supply terminal
More economically, therefore first it is powered using energy-storage battery, recalls DC power supply terminal in the case where electricity shortage.Optionally,
V1 is 530V.
As shown in Fig. 2, more preferably, control method includes: to be powered by photovoltaic cell group to DC bus b
After allowing direct-flow air conditioner to work, if the virtual voltage VDC of DC bus is greater than second predetermined value V2, pass through DC/AC unsteady flow
Device powers to AC network a.If the energy that photovoltaic cell group provides DC bus b is excessive, DC bus can be shown
Virtual voltage VDC be greater than second predetermined value V2, at this time by DC/AC current transformer to AC network a power, can both discharge more
Remaining voltage, the electricity for the power grid a that can also increase exchanges.Optionally, V2 780V.
Optionally, as shown in Fig. 2, allowing direct-flow air conditioner to work it being powered by photovoltaic cell group to DC bus b
Before, it first passes through the alternating current that AC adapter 10 converts in AC network a and powers to DC bus b, by the reality of DC bus
Voltage VDC maintains third predetermined value V3, first to allow direct-flow air conditioner that can normally start in advance.More preferably, passing through light
Volt battery pack is powered DC bus b allow direct-flow air conditioner to work after, if the virtual voltage VDC of DC bus is greater than the
Four predetermined value V4 then stop the alternating current that AC adapter 10 converts in AC network a and power to DC bus b, such air-conditioning
The mode that dependence AC network a can be provided the energy by system, which is converted by itself photovoltaic cell group, obtains energy fortune
Row.Optionally, V3 530V, V4 780V.
As shown in Fig. 2, also passing through DC/AC current transformer if the virtual voltage VDC of DC bus is greater than the 4th predetermined value V4
The virtual voltage VDC of DC bus is maintained between the 4th predetermined value V4 and second predetermined value V2.Once i.e. DC bus
Virtual voltage VDC is greater than the 4th predetermined value V4, then extra to discharge in such a way that DC/AC current transformer is to AC network a power supply
Voltage, the virtual voltage VDC of DC bus is maintained in suitable operating voltage.
More preferably, photovoltaic cell group is adjusted to the output voltage of DC bus b by unidirectional DC/DC module 50, with
So that the voltage adaptation that photovoltaic cell group generates is in the power supply of DC bus b.Optionally, it is adjusted directly by direct current protecting module 60
Feeder ear is flowed to the output voltage of DC bus b, and direct current protecting module is the protection device of direct current supply port, energy when in use
The charging soft start of direct current access and protection and the fault detection alarm of Current Voltage are enough provided.
As another more preferably embodiment, energy-storage battery is adjusted to DC bus b by two-way DC/DC module
Supply voltage, or adjust DC bus b to the charging voltage of energy-storage battery, when energy-storage battery is used to supply DC bus b
When electric, two-way DC/DC module is for adjusting energy-storage battery to the supply voltage of DC bus b；When energy-storage battery is used for from direct current
When bus b storage, two-way DC/DC module is for adjusting DC bus b to the charging voltage of energy-storage battery.
More preferably, in the inventive solutions, control method further include: by the load for adjusting direct-flow air conditioner
To be adapted to the virtual voltage of DC bus.It in some cases, can be with if the virtual voltage of DC bus is not easy to adjust
The load of direct-flow air conditioner is adjusted to be adapted to the virtual voltage of DC bus.Optionally, direct-flow air conditioner is DC frequency converting air-conditioner, can
To comment rate by the operation for adjusting DC frequency converting air-conditioner to be suitable for the virtual voltage of DC bus.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of air-conditioning system, which is characterized in that the air-conditioning system includes:
AC adapter (10), the exchange end of the AC adapter (10) with AC network (a) for being connected；
Direct-flow air conditioner is connected with the DC terminal of the AC adapter (10) by DC bus (b)；
Photovoltaic cell group is connected with the DC bus (b), for powering to the DC bus (b)；
DC power supply terminal is connected with the DC bus (b), for powering to the DC bus (b)；
Energy-storage battery, the port of the energy-storage battery are connected with the DC bus (b), and the energy-storage battery is used for described straight
Flow bus (b) power supply or from DC bus (b) storage；
DC/AC current transformer, the DC bus (b) are also connected by the DC/AC current transformer with the AC network (a), institute
DC bus (b) is stated to power to the AC network (a) by the DC/AC current transformer.
2. a kind of control method of air-conditioning system, which is characterized in that the control method is for controlling sky described in claim 1
Adjusting system, the control method include:
The DC bus (b) is powered by the photovoltaic cell group, the direct-flow air conditioner is allowed to work；
If the virtual voltage VDC of the DC bus is less than first predetermined value V1, by energy-storage battery to DC bus (b)
Power supply；
If the virtual voltage VDC of the DC bus is still less than the first predetermined value V1, pass through DC power supply terminal pair
DC bus (b) power supply.
3. control method according to claim 2, which is characterized in that the control method includes:
After being powered by the photovoltaic cell group to the DC bus (b) direct-flow air conditioner allowed to work, if
The virtual voltage VDC of the DC bus is greater than second predetermined value V2, then by the DC/AC current transformer to AC network (a)
Power supply.
4. control method according to claim 3, which is characterized in that female to the direct current by the photovoltaic cell group
Line (b) is powered allow the direct-flow air conditioner to work before, first pass through the friendship in AC adapter (10) conversion AC network (a)
Galvanic electricity powers to DC bus (b), and the virtual voltage VDC of the DC bus is maintained third predetermined value V3.
5. control method according to claim 4, which is characterized in that female to the direct current by the photovoltaic cell group
Line (b) is powered allow the direct-flow air conditioner to work after, if to be greater than the 4th predetermined by the virtual voltage VDC of the DC bus
Value V4, the then alternating current stopped in AC adapter (10) conversion AC network (a) power to DC bus (b).
6. control method according to claim 5, which is characterized in that if the virtual voltage VDC of the DC bus is big
In the 4th predetermined value V4, the virtual voltage VDC of the DC bus is also maintained the 4th by the DC/AC current transformer and is made a reservation for
Between value V4 and second predetermined value V2.
7. control method according to claim 2, which is characterized in that the control method includes: by unidirectional DC/DC mould
Block (50) adjusts photovoltaic cell group to the output voltage of the DC bus (b).
8. control method according to claim 2, which is characterized in that the control method includes: by direct current protecting mould
Block (60) adjusts the DC power supply terminal to the output voltage of the DC bus (b).
9. control method according to claim 2, which is characterized in that the control method includes: by two-way DC/DC mould
Block adjusts the energy-storage battery to the supply voltage of the DC bus (b), or adjusts the DC bus (b) to the storage
The charging voltage of energy battery.
10. control method according to claim 2, which is characterized in that the control method includes: empty by adjusting direct current
The load of tune is to be adapted to the virtual voltage of the DC bus.
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