CN104142008A - Photovoltaic air conditioner and photovoltaic air conditioning system - Google Patents
Photovoltaic air conditioner and photovoltaic air conditioning system Download PDFInfo
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- CN104142008A CN104142008A CN201410407825.5A CN201410407825A CN104142008A CN 104142008 A CN104142008 A CN 104142008A CN 201410407825 A CN201410407825 A CN 201410407825A CN 104142008 A CN104142008 A CN 104142008A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 80
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims description 20
- 230000003993 interaction Effects 0.000 claims description 15
- 230000010349 pulsation Effects 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 9
- 238000005286 illumination Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a photovoltaic air conditioner and a photovoltaic air conditioning system. Wherein, photovoltaic air conditioner includes: an air conditioning load; the alternating current side of the inverter circuit is connected with the air conditioner load and the commercial power grid respectively, and the direct current side of the inverter circuit is connected with the photovoltaic cell panel and used for converting direct current output by the photovoltaic cell panel into alternating current required by the work of the air conditioner load; the rectification circuit is connected between the inverter circuit and the commercial power grid and is used for converting alternating current output by the commercial power grid into direct current; and the movable positions of the movable contact of the relay comprise a first position and a second position, the alternating current side of the inverter circuit is communicated with the air conditioner load under the condition that the movable contact is positioned at the first position, and the alternating current side of the inverter circuit is communicated with the commercial power grid under the condition that the movable contact is positioned at the second position. According to the invention, the effect of reducing the cost of the photovoltaic air conditioning system is achieved.
Description
Technical field
The present invention relates to air-conditioner field, in particular to a kind of photovoltaic air-conditioner and photovoltaic air-conditioning system.
Background technology
Existing photovoltaic air-conditioner, can realize grid-connected function, photovoltaic and be air-conditioning function of supplying power and simultaneously grid-connected with for air-conditioning, power.Yet existing photovoltaic air-conditioner all has two cover inversion systems conventionally, a set of for generating electricity by way of merging two or more grid systems, a set of for example, for driving air-conditioning load, compressor.
Due in photovoltaic air-conditioner, the cost of inverter circuit power conversion device occupies the larger part of whole photovoltaic air-conditioner, therefore, adopt two cover inversion systems certainly will cause the cost of photovoltaic air-conditioner to raise, this has brought huge obstacle to promoting the use of of photovoltaic air-conditioner.
For cause the high problem of cost of photovoltaic air-conditioner in prior art due to employing two cover inversion systems, effective solution is not yet proposed at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of photovoltaic air-conditioner and photovoltaic air-conditioning system, to solve in prior art owing to adopting two cover inversion systems to cause the high problem of cost of photovoltaic air-conditioning system.
To achieve these goals, according to an aspect of the present invention, provide a kind of photovoltaic air-conditioner.Photovoltaic air-conditioner according to the present invention comprises: air-conditioning load; Inverter circuit, the AC of inverter circuit is connected respectively with utility grid with air-conditioning load, and the DC side of inverter circuit is connected with photovoltaic battery panel, for the direct current of photovoltaic battery panel output is converted into the required alternating current of air-conditioning loaded work piece; Rectification circuit, is connected between inverter circuit and utility grid, for the alternating current of utility grid output is converted into direct current; And relay, be connected between the AC and air-conditioning load of inverter circuit, and be connected between the AC and utility grid of inverter circuit, the moving position of the movable contact of relay comprises primary importance and the second place, at movable contact in primary importance in the situation that, the AC of inverter circuit and air-conditioning load are connected, at movable contact in the second place in the situation that, and the AC of inverter circuit and utility grid connection.
Further, photovoltaic air-conditioner also comprises: control circuit, be connected with relay, and at movable contact, in the second place in the situation that, control circuit is switched to primary importance for control movable contact in the situation that producing island effect.
Further, control circuit comprises: sampling and modulate circuit, for the electric network information of the utility grid of sampling; Master controller, is connected with sampling and modulate circuit, for carrying out logical operation according to the employing signal receiving, the connection status of relay is controlled.
Further, the DC potential of rectification circuit output has the direct current of the voltage of pulsation, and photovoltaic air-conditioner also comprises: booster circuit, is connected between photovoltaic battery panel and the DC side of inverter circuit, for the direct current of photovoltaic battery panel output is boosted, obtain the first direct current; Pfc circuit, be connected between rectification circuit and the DC side of inverter circuit, for the voltage of the pulsation of rectification circuit output is boosted, obtain the second direct current, wherein, booster circuit is all connected with the DC side of inverter circuit by dc bus with pfc circuit.
Further, control circuit is connected respectively with pfc circuit with booster circuit, wherein, at movable contact in primary importance in the situation that, control circuit is used for controlling pfc circuit and exports the second direct current to dc bus, and the first galvanic voltage of controlling booster circuit output is less than the second galvanic voltage; At movable contact in primary importance in the situation that, control circuit is for exporting the first direct current to dc bus by booster circuit, and the second galvanic voltage of controlling pfc circuit output is less than the first galvanic voltage; At movable contact, in primary importance in the situation that, control circuit is controlled respectively booster circuit and pfc circuit, makes the first direct current identical with the second galvanic voltage; At movable contact in the second place in the situation that, control circuit is for the electric network information of the utility grid of sampling, and control the first galvanic voltage of booster circuit output higher than the connection of the second direct current or the control cut-out pfc circuit of pfc circuit output, control circuit is also that alternating current is incorporated to utility grid for controlling inverter circuit by the voltage inversion of dc bus.
Further, photovoltaic air-conditioner also comprises: power supply circuits, are connected respectively with control circuit with dc bus, for providing direct current energy to control circuit; Man-machine interaction circuit, is connected with control circuit, for realizing man-machine data interaction.
Further, man-machine interaction circuit comprises: display circuit, is connected with control circuit, for showing duty and the parameter information of photovoltaic air-conditioner; And key circuit, be connected with control circuit, for realizing the manual control to photovoltaic air-conditioner.
Further, photovoltaic air-conditioner also comprises: the first filter circuit, is connected between photovoltaic battery panel and booster circuit, for the common and different mode of photovoltaic battery panel input is disturbed and filtered.
Further, photovoltaic air-conditioner also comprises: the second filter circuit, be connected between utility grid and rectification circuit, and for high-frequency conduction and radiation that photovoltaic air-conditioner is produced, filter.
Further, photovoltaic air-conditioner also comprises filter inductance, and the first end of filter inductance is connected with utility grid, and the second end of filter inductance is connected with relay, for carrying out shaping to being incorporated into the alternating current of utility grid.
To achieve these goals, according to a further aspect in the invention, provide a kind of photovoltaic air-conditioning system.Photovoltaic air-conditioning system according to the present invention comprises: above-mentioned photovoltaic air-conditioner, and photovoltaic air-conditioner is connected with utility grid; Photovoltaic battery panel, is connected with photovoltaic air-conditioner, for providing electric energy to photovoltaic air-conditioner.
According to the embodiment of the present invention, adopt photovoltaic air-conditioner to comprise: air-conditioning load, inverter circuit, the AC of described inverter circuit is connected with described air-conditioning load, and the DC side of described inverter circuit is connected with photovoltaic battery panel, for the direct current of described photovoltaic battery panel output is converted into the required alternating current of described air-conditioning loaded work piece, rectification circuit, is connected between described inverter circuit and utility grid, for the alternating current of described utility grid output is converted into direct current, and relay, be connected between the AC and described air-conditioning load of described inverter circuit, and be connected between the AC and described utility grid of described inverter circuit, the moving position of the movable contact of described relay comprises primary importance and the second place, at described movable contact in primary importance in the situation that, the AC of described inverter circuit and described air-conditioning load are connected, at described movable contact in the second place in the situation that, the AC of described inverter circuit and described utility grid are connected, solved owing to adopting two cover inversion systems to cause the high problem of cost of photovoltaic air-conditioner, reached the effect that reduces the cost of photovoltaic air-conditioner.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the structural representation of the photovoltaic air-conditioner of the embodiment of the present invention; And
Fig. 2 is according to the structural representation of the preferred photovoltaic air-conditioner of the embodiment of the present invention.
The specific embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, the term " first " in description of the present invention and claims and above-mentioned accompanying drawing, " second " etc. are for distinguishing similar object, and needn't be for describing specific order or precedence.Should be appreciated that the data of such use are suitably exchanging in situation, so that embodiments of the invention described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, for example, those components and parts that the system that has comprised a series of components and parts, product or equipment are not necessarily limited to clearly list, but can comprise clearly do not list or for other intrinsic components and parts of these systems, product or equipment.
The embodiment of the present invention provides a kind of photovoltaic air-conditioner.
Fig. 1 is according to the structural representation of the photovoltaic air-conditioner of the embodiment of the present invention.As shown in Figure 1, this photovoltaic air-conditioner comprises: air-conditioning load 11, inverter circuit 12, rectification circuit 13 and relay 14.
Air-conditioning load can be such as compressor, DC fan etc.
The AC of inverter circuit 12 is connected respectively with utility grid 16 with air-conditioning load 11, and the DC side of inverter circuit 12 is connected with photovoltaic battery panel 15, for the direct current (DC) of photovoltaic battery panel 15 outputs is converted into alternating current (AC).This alternating current can be the required alternating current of air-conditioning load 11 work, or the grid-connected alternating current of using.Rectification circuit 13 is connected between inverter circuit 12 and utility grid 16, for the alternating current of utility grid 16 outputs is converted into direct current, rectification circuit 13 can be full bridge rectifier, for the alternating current of utility grid output being converted into the forward voltage of pulsation.
Relay 14 is connected between the AC and air-conditioning load 11 of inverter circuit 12, and is connected between the AC and utility grid 16 of inverter circuit 12, and relay is for switching the load object (air-conditioning load or utility grid) of inverter circuit 12.
Particularly, the moving position of the movable contact of relay 14 comprises primary importance and the second place, at movable contact in primary importance in the situation that, the AC of inverter circuit 12 and air-conditioning load 11 are connected, at movable contact, in the second place in the situation that, the AC of inverter circuit 12 and utility grid 16 are connected.By controlling the position of movable contact, switch the load object (air-conditioning load or utility grid) that inverter circuit connects.At movable contact in primary importance in the situation that, photovoltaic air-conditioner is in air conditioning mode, air-conditioning loaded work piece, and the required electric energy of its work can be the electric energy that photovoltaic battery panel provides, and can be also the electric energy that utility grid provides, or the two provides electric energy jointly; At movable contact, in the second place in the situation that, photovoltaic air-conditioner is in the pattern of generating electricity by way of merging two or more grid systems, and air-conditioning load is not worked, and the electric energy of photovoltaic battery panel output is incorporated in utility grid.
Particularly, above-mentioned air-conditioning load can be the compressor of air-conditioner, in the embodiment of the present invention, photovoltaic grid-connected inversion module and DRIVEN BY AIR CONDITIONING COMPRESSOR module is united two into one, and by relay switch load, can realize grid-connected work or compressor operating.
The photovoltaic air-conditioner of the embodiment of the present invention is saved an inversion module and radiator and corresponding drive circuit with respect to existing photovoltaic controller, save the grid-connected control relay of inverters simultaneously, significantly reduce photovoltaic air-conditioner cost, be conducive to the penetration and promotion of photovoltaic air-conditioner, more practical.
According to the embodiment of the present invention, photovoltaic air-conditioner comprises: air-conditioning load, inverter circuit, the AC of inverter circuit is connected with air-conditioning load, and the DC side of inverter circuit is connected with photovoltaic battery panel, for the direct current of photovoltaic battery panel output is converted into the required alternating current of air-conditioning loaded work piece, rectification circuit, is connected between inverter circuit and utility grid, for the alternating current of utility grid output is converted into direct current, and relay, be connected between the AC and air-conditioning load of inverter circuit, and be connected between the AC and utility grid of inverter circuit, the moving position of the movable contact of relay comprises primary importance and the second place, at movable contact in primary importance in the situation that, the AC of inverter circuit and air-conditioning load are connected, at movable contact in the second place in the situation that, the AC of inverter circuit and utility grid are connected, solved owing to adopting two cover inversion systems to cause the high problem of cost of photovoltaic air-conditioner, reached the effect that reduces the cost of photovoltaic air-conditioner.
Fig. 2 is according to the structural representation of the preferred photovoltaic air-conditioner of the embodiment of the present invention.As shown in Figure 2, photovoltaic air-conditioner also comprises control circuit 17, this control circuit 17 (not shown) that is connected with relay 14.Wherein, the movable contact of relay 14 comprises K1, K2 and K3, and above-mentioned primary importance is position A shown in figure, and the second place is position B shown in figure.At movable contact K1～K3 in the second place B in the situation that, control circuit 17 is switched to primary importance for control movable contact K1～K3 in the situation that producing island effect, wherein, in the situation of movable contact K1～K3 in primary importance, the AC of inverter circuit 12 and utility grid 16 disconnect.
At movable contact K1～K3, in the second place B in the situation that, photovoltaic air-conditioner is in the pattern of generating electricity by way of merging two or more grid systems.Wherein, when producing island effect, by control circuit control relay, cut off being connected of inverter circuit and utility grid, thereby without increasing again grid-connected control relay, further reduce the cost of photovoltaic air-conditioner.
Preferably, control circuit 17 comprises: sampling and modulate circuit, for the electric network information of the utility grid 16 of sampling; Master controller, is connected with sampling and modulate circuit, for being that above-mentioned electric network information carries out logical operation according to the sampled signal receiving, the connection status of relay is controlled.Wherein, when monitoring utility grid power down, AC and the utility grid 16 of controlling inverter circuit 12 disconnect.
Particularly, control circuit 17 comprises master controller, sampling and modulate circuit, holding circuit, drive circuit etc.The different analog signals such as sampling and the main sampled voltage of modulate circuit, electric current, frequency, phase place, temperature, the line level of going forward side by side conversion, is entered into master controller; Holding circuit is mainly for overvoltage, overcurrent, the abnormal conditions such as overheated, and the protection of power ratio control device emergency shutdown, to guarantee element, equipment and personal safety; Drive circuit provides enough drive currents, with the timely conducting of power ratio control device and shutoff.
The photovoltaic air-conditioner of the embodiment of the present invention has isolated island measuring ability, by sampling utility grid electric network information, when utility grid power down being detected, disconnect in time inverter circuit and utility grid electrical connection, load is switched to compressor.
Preferably, the direct current of rectification circuit output is the direct current with the voltage of pulsation, and photovoltaic air-conditioner also comprises booster circuit 18 and pfc circuit 19.Booster circuit 18 is connected between photovoltaic battery panel 15 and the DC side of inverter circuit 12, for the direct current of photovoltaic battery panel 15 outputs is boosted, obtains the first direct current.Booster circuit 18 is for being upgraded to the low-voltage DC of photovoltaic battery panel in i.e. the first direct current of high voltage direct current, carry out photovoltaic Maximum Power Output point simultaneously and follow the tracks of (MPPT), be that booster circuit 18 can comprise MPPT module, make booster circuit 18 there is MPPT maximum power point tracking function, by MPPT module, gather photovoltaic electric current output voltage and electric current, and rated output, and control the maximum power point of following the trail of photovoltaic battery panel 15 outputs.Booster circuit 18 can be boost circuit or DC/DC circuit or the combination of the two.
Pfc circuit 19 is connected between rectification circuit 13 and the DC side of inverter circuit 12, for the voltage of the pulsation of rectification circuit 13 outputs is boosted, obtain the second direct current, wherein, booster circuit 18 is all connected with the DC side of inverter circuit 12 by dc bus 20 with pfc circuit 19.
Pfc circuit is used for the voltage of the pulsation of rectification circuit 13 outputs to boost and obtain the second direct current, and accesses dc bus 20, and pfc circuit also has power factor emendation function simultaneously, makes input voltage and input current homophase.
Preferably, control circuit 17 is connected respectively with pfc circuit 19 with booster circuit 18, wherein, at movable contact K1～K3 in primary importance A in the situation that, control circuit 17 exports the second direct current to dc bus 20 for controlling pfc circuit 19, and the first galvanic voltage of controlling booster circuit 18 outputs is less than the second galvanic voltage, booster circuit 18 outputs are by dc bus 20 voltage clamps, photovoltaic air-conditioner consumes the energy of utility grid, and this pattern is identical with common air-conditioning mode of operation.
At movable contact K1～K3 in primary importance A in the situation that, control circuit 17 is for exporting the first direct current to dc bus 20 by booster circuit 18, and the second galvanic voltage of controlling pfc circuit 19 outputs is less than the first galvanic voltage, PFC output is by dc bus 20 voltage clamps, and photovoltaic air-conditioner consumes the energy of photovoltaic battery panel input.
At movable contact photovoltaic air-conditioner in primary importance A in the situation that, control circuit 17 is controlled respectively booster circuit 18 and pfc circuit 19, make the first direct current identical with the second galvanic voltage, for dc bus 20 provides energy, air-conditioning load 11 is obtained work institute energy requirement from dc bus 20 jointly.
At movable contact in the second place B in the situation that, control circuit 17 is for the electric network information of the utility grid 16 of sampling, and control the first galvanic voltage of booster circuit 18 outputs higher than the connection of the second direct current or the control cut-out pfc circuit 19 of pfc circuit 19 outputs, control circuit 17 is also that alternating current is incorporated to utility grid 16 for controlling inverter circuit 12 by the voltage inversion of dc bus 20.
Particularly, the photovoltaic air-conditioner of the embodiment of the present invention has 4 kinds of mode of operations:
1. common air-conditioning pattern: identical with common air-conditioning mode of operation, photovoltaic air-conditioner obtains institute's energy requirement from utility grid 16.
2. photovoltaic power supply pattern: photovoltaic air-conditioner consumes the energy of photovoltaic battery panel 15.
3. mix powering mode: utility grid 16 and photovoltaic battery panel 15 are jointly for photovoltaic air-conditioner provides institute's energy requirement.
4. the pattern of generating electricity by way of merging two or more grid systems: the electric energy that photovoltaic battery panel 15 is produced is incorporated to utility grid 16.
Wherein, 1. common air-conditioning pattern: relay K 1～K3 is closed to A point, photovoltaic air-conditioner switches to air conditioning mode, control circuit 17 is sent to dc bus 20 after the alternating current of utility grid 16 being converted into high voltage direct current by rectification circuit 13 and pfc circuit 19, controlling booster circuit 18 makes its output voltage (i.e. the first galvanic voltage) be less than the output voltage (i.e. the second galvanic voltage) of pfc circuit 19, the output of booster circuit 18 is by dc bus 20 voltage clamps, photovoltaic air-conditioner consumes the energy of utility grid 16, this pattern is identical with common air-conditioning mode of operation.
2. photovoltaic power supply pattern: relay K 1～K3 is closed to A point, photovoltaic air-conditioner switches to air conditioning mode, control circuit 17 is controlled after booster circuit 18 boosts the output voltage of photovoltaic battery panel 15 and is sent to dc bus 20, controlling pfc circuit 19 makes its output voltage (i.e. the second galvanic voltage) be less than the output voltage (i.e. the first galvanic voltage) of booster circuit 18, the output of pfc circuit 19 is by dc bus 20 voltage clamps, and photovoltaic air-conditioner consumes the energy of photovoltaic battery panel 15 inputs.
3. mix powering mode: relay K 1～K3 is closed to A point, photovoltaic air-conditioner switches to air conditioning mode, control circuit 17 is controlled respectively booster circuit 18 and pfc circuit 19, making the two output voltage, identical the first direct current is identical with the second galvanic voltage, for dc bus 20 provides energy, air-conditioning load 11 is obtained work institute energy requirement from dc bus 20 jointly.
4. the pattern of generating electricity by way of merging two or more grid systems: relay K 1～K3 is closed to B point, photovoltaic air-conditioner switches to the pattern of generating electricity by way of merging two or more grid systems, the voltage of control circuit 17 sampling utility grid 16 obtains electric network information (voltage, amplitude, phase place etc.), control circuit 17 is controlled booster circuit 18 and is made its output voltage (i.e. the first galvanic voltage) higher than the output voltage (i.e. the second galvanic voltage) of pfc circuit 19 or cut off pfc circuit 19, by photovoltaic battery panel 15, provide energy for dc bus 20, controlling inverter circuit 12 is alternating current by dc bus 20 voltage inversions, is incorporated in utility grid 16.
Above-mentioned several mode of operation is not changeless, and the mode of operation of photovoltaic air-conditioner changes with power output and the air-conditioning load power demand of photovoltaic battery panel.For example, because the power output of photovoltaic battery panel 15 is subject to illumination, the impact of blocking changes greatly, in the time of in working in air conditioning mode, priority task is in 2. photovoltaic power supply pattern, when the power output of photovoltaic battery panel 15 is less than air-conditioning power demand, photovoltaic air-conditioner switches to 3. hybrid power supply pattern, and when the minimum input voltage (as unglazed in night photograph or low light situation) of photovoltaic input voltage lower than booster circuit 18, photovoltaic air-conditioner switches to 1. common air-conditioning pattern.
Wherein, when illumination lower, the power output of solar photovoltaic cell panel is less, now photovoltaic power output is lower, during the work of photovoltaic air-conditioner, relay K 1～K3 adhesive is to A point, and photovoltaic air-conditioner now is still powered by utility grid when work, and its working method and common air-conditioning working method are in full accord.
More sufficient when illumination, and need to open photovoltaic air-conditioner time, relay K 1～K3 adhesive, to A point, provides photovoltaic air-conditioner operation institute energy requirement by photovoltaic DC-to-AC converter.
When photovoltaic air-conditioner operate power is greater than the power that photovoltaic battery panel provides, by photovoltaic battery panel and utility grid, jointly provide photovoltaic air-conditioner operation institute energy requirement.
More sufficient when illumination, and when opening photovoltaic air-conditioner, relay K 1～K3 adhesive is to B point, and photovoltaic DC-to-AC converter is started working, and the energy of photovoltaic battery panel output is fed to utility grid.
Preferably, photovoltaic air-conditioner also comprises: power supply circuits 21 and man-machine interaction circuit 22.Power supply circuits 21 are connected respectively with control circuit 17 with dc bus 20, for providing direct current energy to control circuit 17; Man-machine interaction circuit 22 is connected with control circuit 17, for realizing man-machine data interaction.
Power supply circuits 21 can provide galvanic current source for various low voltage equipments (comprising control circuit).Man-machine interaction circuit can for example show the running status of photovoltaic air-conditioner for realizing man-machine interaction, and the control instruction that receives user's input is to control photovoltaic air-conditioner etc.
Further, man-machine interaction circuit 22 comprises: display circuit, is connected with control circuit 17, for showing duty and the parameter information of photovoltaic air-conditioner; And key circuit, be connected with control circuit 17, for realizing the manual control to photovoltaic air-conditioner.
Particularly, man-machine interaction circuit 22 comprises display circuit, key circuit etc., realize to show, manually controls and the interactive function such as auditory tone cues.Display circuit is for showing working state of system, parameter, statistical information etc. in mode intuitively; Key circuit is for realizing the various control functions to air-conditioning.
Preferably, photovoltaic air-conditioner also comprises the first filter circuit 23, and this first filter circuit 23 is connected between photovoltaic battery panel 15 and booster circuit 18, for the common and different mode of photovoltaic battery panel 15 inputs is disturbed and filtered.
The first filter circuit 23 can be photovoltaic input EMI filter circuit, and the common and different mode for filtering through photovoltaic battery panel 15 inputs disturbs, and the protection such as lightning-protection surge.
Preferably, photovoltaic air-conditioner also comprises the second filter circuit 24, and this second filter circuit 24 is connected between utility grid 16 and rectification circuit 13, for high-frequency conduction and radiation that photovoltaic air-conditioner is produced, filters.
The second filter circuit 24 can be to exchange input EMI filter circuit, and the high-frequency conduction and the radiation that while working for filtering convertible frequency air-conditioner, produce, reduce the interference to utility grid 16.
As shown in Figure 2, photovoltaic air-conditioner also comprises filter inductance 25, and the first end of this filter inductance 25 is connected with utility grid 16, and the second end of filter inductance 25 is connected with relay, for carrying out shaping to being incorporated into the alternating current of utility grid 16.Particularly, filter inductance 25 can be linked in utility grid 16 by the second filter circuit 24.
When photovoltaic air-conditioner is when generating electricity by way of merging two or more grid systems pattern, by 25 pairs of grid-connected current of filter inductance, carry out shaping, the grid-connected current that makes the electric energy of photovoltaic battery panel output be linked into utility grid 16 meets the requirement of utility grid 16.
Below in conjunction with Fig. 2, the photovoltaic air-conditioner of the embodiment of the present invention is described in detail.
The photovoltaic air-conditioner of the embodiment of the present invention mainly comprises and exchanges input EMI filter circuit the second filter circuit 24, full bridge rectifier are that rectification circuit 13, pfc circuit 19, power supply circuits 21, control circuit 17, man-machine interaction circuit 22, inverter circuit 12, compressor are air-conditioning load 11, photovoltaic input EMI filter circuit i.e. the first filter circuit 23, booster circuit 18 and be partly relay 14 for the relay K 1～K3 of switch load.
The high-frequency conduction and the radiation that while exchanging input EMI filter circuit for the work of filtering convertible frequency air-conditioner, produce, reduce the interference to utility grid.
Full bridge rectifier is for changing alternating voltage into the voltage of pulsation.
Pfc circuit 19 is for the voltage of the pulsation of rectification circuit 13 output is boosted and obtains the second direct current, and accesses dc bus 20, and pfc circuit 19 also has power factor emendation function simultaneously, makes input voltage and input current homophase.
Power supply circuits 21 are used to various low voltage equipments that galvanic current source is provided.
Compressor is used for driving refrigerant to flow and state conversion at air-conditioning duct, to realize the refrigeration of air-conditioning or to heat running.
For filtering, the common and different mode through photovoltaic battery panel input disturbs photovoltaic input EMI filter circuit, and the protection such as lightning-protection surge.
Booster circuit 18, for the low-voltage DC of photovoltaic battery panel 15 is upgraded to high voltage direct current, carries out photovoltaic Maximum Power Output point simultaneously and follows the tracks of (MPPT).
Inverter circuit 12 can be both that the adjustable three-phase alternating current of frequency offers compressor by DC inverter, also reversiblely became single-phase or three-phase main-frequency electric current, was incorporated to utility grid 16.
Relay 14 is for switching the load object (compressor or utility grid) of inverter circuit 12.
Man-machine interaction circuit 22 comprises display circuit, key circuit etc., realize to show, manually controls and the interactive function such as auditory tone cues.Display circuit is for showing working state of system, parameter, statistical information etc. in mode intuitively; Key circuit is for realizing the various control functions to air-conditioning.
Control circuit 17 comprises master controller, sampling and modulate circuit, holding circuit, drive circuit etc.The different analog signals such as sampling and the main sampled voltage of modulate circuit, electric current, frequency, phase place, temperature, the line level of going forward side by side conversion, is entered into master controller; Holding circuit is mainly for overvoltage, overcurrent, the abnormal conditions such as overheated, and the protection of power ratio control device emergency shutdown, to guarantee element, equipment and personal safety; Drive circuit provides enough drive currents, with the timely conducting of power ratio control device and shutoff.
Above-mentioned booster circuit 18 has MPPT function, by MPPT algorithm, gathers photovoltaic electric current output voltage and electric current, and rated output, and controls the maximum power point of following the trail of photovoltaic battery panel output.
Above-mentioned photovoltaic air-conditioner has isolated island measuring ability, by isolated island detection algorithm sampling utility grid voltage, when utility grid power down being detected, load is switched to compressor to disconnect in time the electrical connection of inverter circuit and utility grid.
Above-mentioned photovoltaic air-conditioner has network voltage detection function, amplitude, frequency and phase information that can detection of grid voltage, and by these communications in master controller, control that inverter circuit 12 works in and net state.
It is as follows that the photovoltaic air-conditioner of the embodiment of the present invention has following several mode of operation:
1. common air-conditioning pattern: relay K 1～K3 is closed to A point, photovoltaic air-conditioner switches to air conditioning mode, control circuit 17 is sent to dc bus 20 after the alternating current of utility grid 16 being converted into high voltage direct current by rectification circuit 13 and pfc circuit 19, controlling booster circuit 18 makes its output voltage (i.e. the first galvanic voltage) be less than the output voltage (i.e. the second galvanic voltage) of pfc circuit 19, the output of booster circuit 18 is by dc bus 20 voltage clamps, photovoltaic air-conditioner consumes the energy of utility grid 16, and this pattern is identical with common air-conditioning mode of operation.
2. photovoltaic power supply pattern: relay K 1～K3 is closed to A point, photovoltaic air-conditioner switches to air conditioning mode, control circuit 17 is controlled after booster circuit 18 boosts the output voltage of photovoltaic battery panel 15 and is sent to dc bus 20, controlling pfc circuit 19 makes its output voltage (i.e. the second galvanic voltage) be less than the output voltage (i.e. the first galvanic voltage) of booster circuit 18, the output of pfc circuit 19 is by dc bus 20 voltage clamps, and photovoltaic air-conditioner consumes the energy of photovoltaic battery panel input.
3. mix powering mode: relay K 1～K3 is closed to A point, photovoltaic air-conditioner switches to air conditioning mode, control circuit 17 is controlled respectively booster circuit 18 and pfc circuit 19, making the two output voltage, identical the first direct current is identical with the second galvanic voltage, for dc bus 20 provides energy, air-conditioning load 11 is obtained work institute energy requirement from dc bus 20 jointly.
4. the pattern of generating electricity by way of merging two or more grid systems: relay K 1～K3 is closed to B point, photovoltaic air-conditioner switches to the pattern of generating electricity by way of merging two or more grid systems, the voltage of control circuit 17 sampling utility grid 16 obtains electric network information (voltage, amplitude, phase place etc.), control circuit 17 is controlled booster circuit 18 and is made its output voltage (i.e. the first galvanic voltage) higher than the output voltage (i.e. the second galvanic voltage) of pfc circuit 19 or cut off pfc circuit 19, by photovoltaic battery panel 15, provide energy for dc bus 20, controlling inverter circuit 12 is alternating current by dc bus 20 voltage inversions, is incorporated in utility grid 16.
Above-mentioned several mode of operation is not changeless, and the mode of operation of photovoltaic air-conditioner changes with power output and the air-conditioning load power demand of photovoltaic battery panel.For example, because the power output of photovoltaic battery panel 15 is subject to illumination, the impact of blocking changes greatly, in the time of in working in air conditioning mode, priority task is in 2. photovoltaic power supply pattern, when the power output of photovoltaic battery panel 15 is less than air-conditioning power demand, photovoltaic air-conditioner switches to 3. hybrid power supply pattern, and when the minimum input voltage (as unglazed in night photograph or low light situation) of photovoltaic input voltage lower than booster circuit 18, photovoltaic air-conditioner switches to 1. common air-conditioning pattern.
Wherein, when illumination lower, the power output of solar photovoltaic cell panel is less, now photovoltaic power output is lower, during the work of photovoltaic air-conditioner, relay K 1～K3 adhesive is to A point, and photovoltaic air-conditioner device is now still by mains-supplied when work, and its working method and common air-conditioning working method are in full accord.
More sufficient when illumination, and need to open photovoltaic air-conditioner time, relay K 1～K3 adhesive, to A point, provides photovoltaic air-conditioner operation institute energy requirement by photovoltaic DC-to-AC converter.
When photovoltaic air-conditioner operate power is greater than the power that photovoltaic battery panel provides, by photovoltaic battery panel and utility grid, jointly provide photovoltaic air-conditioner operation institute energy requirement.
More sufficient when illumination, and when opening photovoltaic air-conditioner, relay K 1～K3 adhesive is to B point, and photovoltaic DC-to-AC converter is started working, and the energy of photovoltaic battery panel output is fed to utility grid.
The embodiment of the present invention also provides a kind of photovoltaic air-conditioning system.This photovoltaic air-conditioning system comprises: photovoltaic air-conditioner, and photovoltaic air-conditioner is connected with utility grid; Photovoltaic battery panel, is connected with photovoltaic air-conditioner, for providing electric energy to photovoltaic air-conditioner.Wherein, the photovoltaic air-conditioner that photovoltaic air-conditioner provides for the embodiment of the present invention.Can the description to photovoltaic air-conditioner referring to the above embodiment of the present invention about the specific descriptions of photovoltaic air-conditioning system, do not repeat here.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. a photovoltaic air-conditioner, is characterized in that, comprising:
Air-conditioning load;
Inverter circuit, the AC of described inverter circuit is connected respectively with utility grid with described air-conditioning load, and the DC side of described inverter circuit is connected with photovoltaic battery panel, for the direct current of described photovoltaic battery panel output is converted into alternating current;
Rectification circuit, is connected between described inverter circuit and described utility grid, for the alternating current of described utility grid output is converted into direct current; And
Relay, be connected between the AC and described air-conditioning load of described inverter circuit, and be connected between the AC and described utility grid of described inverter circuit, the moving position of the movable contact of described relay comprises primary importance and the second place, at described movable contact in primary importance in the situation that, the AC of described inverter circuit and described air-conditioning load are connected, at described movable contact, in the second place in the situation that, the AC of described inverter circuit and described utility grid are connected.
2. photovoltaic air-conditioner according to claim 1, it is characterized in that, described photovoltaic air-conditioner also comprises: control circuit, be connected with described relay, at described movable contact, in the second place in the situation that, described control circuit is switched to primary importance for control described movable contact in the situation that producing island effect, wherein, in the situation of described movable contact in described primary importance, the AC of described inverter circuit and described utility grid disconnect.
3. photovoltaic air-conditioner according to claim 2, is characterized in that, described control circuit comprises:
Sampling and modulate circuit, for the electric network information of the described utility grid of sampling; And
Master controller, is connected with described sampling and modulate circuit, for carrying out logical operation according to the sampled signal receiving, the connection status of relay is controlled.
4. photovoltaic air-conditioner according to claim 2, is characterized in that, the direct current of described rectification circuit output is the direct current with the voltage of pulsation, and described photovoltaic air-conditioner also comprises:
Booster circuit, is connected between described photovoltaic battery panel and the DC side of described inverter circuit, for the direct current of described photovoltaic battery panel output is boosted, obtains the first direct current; And
Pfc circuit, is connected between described rectification circuit and the DC side of described inverter circuit, for the voltage of the pulsation of described rectification circuit output is boosted, obtains the second direct current,
Wherein, described booster circuit is all connected with the DC side of described inverter circuit by dc bus with described pfc circuit.
5. photovoltaic air-conditioner according to claim 4, is characterized in that, described control circuit is connected respectively with described pfc circuit with described booster circuit, wherein,
At described movable contact in described primary importance in the situation that, described control circuit is used for controlling described pfc circuit and exports described the second direct current to described dc bus, and the first galvanic voltage of controlling the output of described booster circuit is less than described the second galvanic voltage;
At described movable contact in described primary importance in the situation that, described control circuit is for exporting described dc bus by described booster circuit to by described the first direct current, and controls the second galvanic voltage that described pfc circuit exports and be less than described the first galvanic voltage;
At described movable contact, in described primary importance in the situation that, described control circuit is controlled respectively described booster circuit and described pfc circuit, makes described the first direct current identical with described the second galvanic voltage;
At described movable contact in the described second place in the situation that, described control circuit is for the electric network information of the described utility grid of sampling, and control the first galvanic voltage of described booster circuit output higher than the connection of the second direct current or the described pfc circuit of control cut-out of described pfc circuit output, described control circuit is also that alternating current is incorporated to described utility grid for controlling described inverter circuit by the voltage inversion of described dc bus.
6. photovoltaic air-conditioner according to claim 4, is characterized in that, described photovoltaic air-conditioner also comprises:
Power supply circuits, are connected respectively with described control circuit with described dc bus, for providing direct current energy to described control circuit;
Man-machine interaction circuit, is connected with described control circuit, for realizing man-machine data interaction.
7. photovoltaic air-conditioner according to claim 6, is characterized in that, described man-machine interaction circuit comprises:
Display circuit, is connected with described control circuit, for showing duty and the parameter information of described photovoltaic air-conditioner; And
Key circuit, is connected with described control circuit, for realizing the manual control to described photovoltaic air-conditioner.
8. photovoltaic air-conditioner according to claim 4, is characterized in that, described photovoltaic air-conditioner also comprises:
The first filter circuit, is connected between described photovoltaic battery panel and described booster circuit, for the common and different mode of described photovoltaic battery panel input is disturbed and filtered.
9. photovoltaic air-conditioner according to claim 1, is characterized in that, described photovoltaic air-conditioner also comprises:
The second filter circuit, is connected between described utility grid and described rectification circuit, for high-frequency conduction and radiation that described photovoltaic air-conditioner is produced, filters.
10. according to the photovoltaic air-conditioner described in any one in claim 1 to 5, it is characterized in that, described photovoltaic air-conditioner also comprises:
Filter inductance, the first end of described filter inductance is connected with described utility grid, and the second end of described filter inductance is connected with described relay, for carrying out shaping to being incorporated into the alternating current of described utility grid.
11. 1 kinds of photovoltaic air-conditioning systems, is characterized in that, comprising:
Photovoltaic air-conditioner in claim 1 to 10 described in any one, described photovoltaic air-conditioner is connected with utility grid;
Photovoltaic battery panel, is connected with described photovoltaic air-conditioner, for providing electric energy to described photovoltaic air-conditioner.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410407825.5A CN104142008A (en) | 2014-08-18 | 2014-08-18 | Photovoltaic air conditioner and photovoltaic air conditioning system |
| PCT/CN2015/084497 WO2016026363A1 (en) | 2014-08-18 | 2015-07-20 | Photovoltaic air conditioner and photovoltaic air conditioning system |
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| CN201410407825.5A CN104142008A (en) | 2014-08-18 | 2014-08-18 | Photovoltaic air conditioner and photovoltaic air conditioning system |
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| WO (1) | WO2016026363A1 (en) |
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| WO2016026363A1 (en) * | 2014-08-18 | 2016-02-25 | 珠海格力电器股份有限公司 | Photovoltaic air conditioner and photovoltaic air conditioning system |
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| CN104142008A (en) * | 2014-08-18 | 2014-11-12 | 珠海格力电器股份有限公司 | Photovoltaic air conditioner and photovoltaic air conditioning system |
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Application publication date: 20141112 |