CN204043127U - PV air-conditioner system - Google Patents
PV air-conditioner system Download PDFInfo
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- CN204043127U CN204043127U CN201420360318.6U CN201420360318U CN204043127U CN 204043127 U CN204043127 U CN 204043127U CN 201420360318 U CN201420360318 U CN 201420360318U CN 204043127 U CN204043127 U CN 204043127U
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Abstract
The utility model discloses a kind of PV air-conditioner system, comprise photovoltaic cell, photovoltaic DC-to-AC converter and air-conditioner, photovoltaic cell is connected with air-conditioner and electrical network respectively by photovoltaic DC-to-AC converter, also comprise controller, controller comprises first detection module, the first monitoring modular, the first control module and the first tracking module, wherein: first detection module, for detecting the power output of photovoltaic cell; First monitoring modular, for monitoring the operate power of air-conditioner; First control module, for according to power output and operate power, controlling PV air-conditioner systematic evaluation is different duties; First tracking module, for according to different duties, carries out MPPT maximum power point tracking to photovoltaic cell.It is by the controller duty different according to PV air-conditioner system, MPPT maximum power point tracking is carried out to photovoltaic cell, solve existing PV air-conditioner control method, effectively can not utilize the power output of photovoltaic cell and the problem that effectively can not improve the efficiency of PV air-conditioner.
Description
Technical field
The utility model relates to household appliance technical field, particularly relates to a kind of PV air-conditioner system.
Background technology
PV air-conditioner, owing to adopting photovoltaic cell as the power supply of air-conditioner, not only saves the energy, also protects environment simultaneously, therefore have and well develop sight.Existing PV air-conditioner is managed by the power output of solar powered controller to photovoltaic cell usually, is specially:
By peak power output control unit MPPT (the Maximum Power Point Tracking in solar powered controller, MPPT maximum power point tracking) monitor the power output of photovoltaic cell, and after the low-voltage DC that photovoltaic cell exports is converted to high voltage direct current by the DC-DC high-voltage inverter controlled in solar powered controller, power supply, to air-conditioner, realizes the operation of air-conditioner.But this kind of PV air-conditioner control method is comparatively single, effectively can not utilize the power output of photovoltaic cell, and then effectively can not improve the efficiency of PV air-conditioner.
Utility model content
Based on this, be necessary for existing PV air-conditioner control method single, effectively can not utilize the power output of photovoltaic cell, and then effectively can not improve the efficiency of PV air-conditioner, and the problem of the concrete control that maximum power of photovoltaic cell point is followed the tracks of can not be learned, a kind of PV air-conditioner system is provided.
For realizing a kind of PV air-conditioner system that the utility model object provides, comprise photovoltaic cell, photovoltaic DC-to-AC converter and air-conditioner, described photovoltaic cell is connected with described air-conditioner and electrical network respectively by described photovoltaic DC-to-AC converter, also comprise controller, described controller comprises first detection module, the first monitoring modular, the first control module and the first tracking module, wherein:
Described first detection module, for detecting the power output of described photovoltaic cell;
Described first monitoring modular, for monitoring the operate power of described air-conditioner;
Described first control module, for according to described power output and described operate power, controlling described PV air-conditioner systematic evaluation is different duties;
Described first tracking module, for according to described different duty, carries out MPPT maximum power point tracking to described photovoltaic cell.
Wherein in an embodiment, described controller also comprises the second control module, for according to described different duty, controls the busbar voltage of described PV air-conditioner system.
Wherein in an embodiment, described photovoltaic DC-to-AC converter comprises the first change-over switch and the second change-over switch, wherein:
The input of described first change-over switch is connected with the output of described photovoltaic cell, first output of described first change-over switch is connected with the compressor inverter of described air-conditioner, and the second output of described first change-over switch is connected with the input of the combining inverter in described photovoltaic DC-to-AC converter;
The input of described second change-over switch is connected with the output of described combining inverter, first output of described second change-over switch is connected with the power factor corrector in described air-conditioner, and the second output of described second change-over switch is connected with the input of described electrical network;
Described first control module is connected with described first change-over switch and described second change-over switch respectively;
When described power output is greater than described operate power, and described operate power non-vanishing time, described first control module is by controlling the input of described first change-over switch and the first output conducting of described first change-over switch, and controlling described PV air-conditioner systematic evaluation is the first duty;
Described first duty is: described supplying power for photovoltaic cell gives described air-conditioner;
When described power output is equal to or less than described operate power, and described operate power non-vanishing time, described first control module is by controlling the input of described first change-over switch and the first output conducting of described first change-over switch, and the second output conducting of the first output of described second change-over switch and described second change-over switch, controlling described PV air-conditioner systematic evaluation is the second duty;
Described second duty is: described photovoltaic cell and described electrical network are powered to described air-conditioner simultaneously;
When described operate power is zero, described first control module is by controlling the input of described first change-over switch and the second output conducting of described first change-over switch, and the second output conducting of the input of described second change-over switch and described second change-over switch, controlling described PV air-conditioner systematic evaluation is the 3rd duty;
Described 3rd duty is: the described power output of described photovoltaic cell inputs to described electrical network.
Wherein in an embodiment, described first tracking module comprises first and chooses unit and the first scanning element;
Described first chooses unit, for when described PV air-conditioner systematic evaluation is described first duty, chooses the first sweep spacing according to described operate power;
Described first scanning element, for every described first sweep spacing, adopts the output voltage of variable step disturbance view mode to described photovoltaic cell to scan, observes described power output;
Described first scanning element comprises the first setting subelement, when scanning for adopting the described output voltage of described variable step disturbance view mode to described photovoltaic cell, according to described operate power setting disturbance step-length.
Wherein in an embodiment, described first tracking module also comprises second and chooses unit and the second scanning element;
Described second chooses unit, when being described second duty for described PV air-conditioner systematic evaluation, chooses the second sweep spacing according to the maximized mode of the power output of described photovoltaic cell;
Described second scanning element, for every described second sweep spacing, adopts the described output voltage of described variable step disturbance view mode to described photovoltaic cell to scan, observes described power output;
Described second scanning element comprises the second setting subelement, sets described disturbance step-length for maximizing mode according to the described power output of described photovoltaic cell.
Wherein in an embodiment, described first tracking module also comprises the 3rd and chooses unit and the 3rd scanning element;
Described 3rd chooses unit, and when being described 3rd duty for described PV air-conditioner systematic evaluation, the maximized mode of described power output according to described photovoltaic cell chooses the 3rd sweep spacing;
Described 3rd scanning element, for every described 3rd sweep spacing, adopts the described output voltage of described variable step disturbance view mode to described photovoltaic cell to scan, observes described power output;
Described 3rd scanning element comprises the 3rd setting subelement, sets described disturbance step-length for the maximized mode of described power output according to described photovoltaic cell.
Wherein in an embodiment, described second control module comprises the first control unit, when being described first duty for described PV air-conditioner systematic evaluation, controls described busbar voltage according to described power output and described operate power.
Wherein in an embodiment, described second control module also comprises the first detecting unit, the second control unit and the 3rd control unit;
Described first detecting unit, when being described second duty for described PV air-conditioner systematic evaluation, detects the described power factor corrector whether enabled in described air-conditioner;
Described second control unit, for when described in not enabled during power factor corrector, according to busbar voltage described in the first Control of Voltage that the described electrical network after rectification exports, and adjust the described power output of described photovoltaic cell until described busbar voltage is less than or equal to specified busbar voltage;
Described 3rd control unit, for when enabling described power factor corrector, according to busbar voltage described in the second Control of Voltage that described power factor corrector exports.
Wherein in an embodiment, described second control module also comprises the 4th control unit, when being described 3rd duty for described PV air-conditioner systematic evaluation, the current amplitude that the described combining inverter in real time in the described PV air-conditioner system of adjustment exports, controls described busbar voltage.
The beneficial effect of above-mentioned PV air-conditioner system: by arranging controller in PV air-conditioner system, according to the power output of the photovoltaic cell that the first detection module in controller detects, with the operate power of the air-conditioner that the first monitoring module monitors arrives, controlling PV air-conditioner systematic evaluation is different duties.And the different duty residing for PV air-conditioner system, MPPT maximum power point tracking is carried out to photovoltaic cell, realize the effective utilization to the power output of photovoltaic cell, thus effectively improve the efficiency of PV air-conditioner system, solve existing PV air-conditioner control method single, effectively can not utilize the power output of photovoltaic cell, and then effectively can not improve the problem of the efficiency of PV air-conditioner.
Accompanying drawing explanation
Fig. 1 is PV air-conditioner system one specific embodiment circuit diagram;
Fig. 2 is the circuit diagram of PV air-conditioner system one specific embodiment when switching to the first duty;
Fig. 3 is the circuit diagram of PV air-conditioner system one specific embodiment when switching to the second duty;
Fig. 4 is the circuit diagram of PV air-conditioner system one specific embodiment when switching to the 3rd duty.
Detailed description of the invention
For making technical solutions of the utility model clearly, below in conjunction with drawings and the specific embodiments, the utility model is described in further details.
See Fig. 1, as the PV air-conditioner system 100 of a specific embodiment, comprise photovoltaic cell 110, photovoltaic DC-to-AC converter 120 and air-conditioner 130.Photovoltaic cell 110 is connected with air-conditioner 130 and electrical network 140 respectively by photovoltaic DC-to-AC converter 120.Also comprise controller 150, controller 150 comprises first detection module, the first monitoring modular, the first control module and the first tracking module (all not shown in figure), wherein:
First detection module, for detecting the power output of photovoltaic cell 110.
First monitoring modular, for monitoring the operate power of air-conditioner 130.
First control module, for according to power output and operate power, controls PV air-conditioner system 100 and switches to different duties.
First tracking module, for according to different duties, carries out MPPT maximum power point tracking to photovoltaic cell 110.
It by arranging controller 150 in PV air-conditioner system 100, according to the power output of the photovoltaic cell 110 that the first detection module in controller 150 detects, with the operate power of the air-conditioner 130 that the first monitoring module monitors arrives, control PV air-conditioner system 100 and switch to different duties.And the different duty residing for PV air-conditioner system 100, MPPT maximum power point tracking is carried out to photovoltaic cell 110, realize the effective utilization to the power output of photovoltaic cell 110, thus effectively improve the efficiency of PV air-conditioner system 100, solve existing PV air-conditioner control method single, effectively can not utilize the power output of photovoltaic cell, and then effectively can not improve the problem of the efficiency of PV air-conditioner.
Wherein, when the first detection module in controller 150 detects the power output of photovoltaic cell 110, by detecting output voltage and the output current of photovoltaic cell 110 respectively, by calculating the power output of photovoltaic cell 110.
After obtaining the power output of photovoltaic cell 110 and the operate power of air-conditioner 130, the first control module in controller 150 just according to the operate power of the power output of photovoltaic cell 110 and air-conditioner 130, can control PV air-conditioner system 100 and switches to different duties.Usually, the duty of PV air-conditioner system 100 mainly comprises three kinds:
When air-conditioner 130 is in the operation phase, namely when the operate power of air-conditioner 130 is non-vanishing, comprise two kinds of situations:
One, when the power output of photovoltaic cell 110 is greater than the operate power of air-conditioner 130, namely the power output of photovoltaic cell 110 can reach the operate power of air-conditioner 130, and when having enough surpluses, the power output of photovoltaic cell 110 is enough to the normal operation ensureing air-conditioner 130.Therefore, now can control PV air-conditioner system 100 and switch to the first duty, namely only need photovoltaic cell 110 to power to air-conditioner 130.
Its two, when the power output of photovoltaic cell 110 is equal to or less than the operate power of air-conditioner 130, the power output of photovoltaic cell 110 may be not enough to the normal operation ensureing air-conditioner 130.Therefore, also need electrical network 140 to power to air-conditioner 130, guarantee the normal operation of air-conditioner 130.Now can control PV air-conditioner system 100 and switch to the second duty, namely photovoltaic cell 110 and electrical network 140 are powered to air-conditioner 130 simultaneously.
When the operate power monitoring air-conditioner 130 is zero, namely air-conditioner 130 is in the shutdown stage, now for avoiding the power output of photovoltaic cell 110 not to be wasted, the power output of photovoltaic cell 110 can be carried out grid-connected process.Namely control PV air-conditioner system 100 and switch to the 3rd duty, the power output of photovoltaic cell 110 inputs to electrical network 140.
The first control module in controller 150, according to the operate power of the power output of photovoltaic cell 110 and air-conditioner 130, controls PV air-conditioner system 100 and switches to different duties to realize by increasing by two change-over switches in the photovoltaic DC-to-AC converter 120 in PV air-conditioner system 100.Be specially:
See Fig. 1, as a kind of embodiment, photovoltaic DC-to-AC converter 120 comprises the first change-over switch 121 and the second change-over switch 122, wherein:
The input of the first change-over switch 121 is connected with the output of photovoltaic cell 110, first output of the first change-over switch 121 is connected with the compressor inverter 131 of air-conditioner 130, and the second output of the first change-over switch 121 is connected with the input of the combining inverter 123 in photovoltaic DC-to-AC converter 120.
The input of the second change-over switch 122 is connected with the output of combining inverter 123, first output of the second change-over switch 122 is connected with the power factor corrector 132 in air-conditioner 130, and the second output of the second change-over switch 122 is connected with the input of electrical network 140.
First control module is connected with the first change-over switch 121 and the second change-over switch 122 respectively.
When power output is greater than operate power, and when operate power is non-vanishing, the first control module, by the input of control first change-over switch 121 and the first output conducting of the first change-over switch 121, controls PV air-conditioner system 100 and switches to the first duty.Wherein, the first duty is: photovoltaic cell 110 is powered to air-conditioner 130.Usually, the power output of photovoltaic cell 110 inputs to air-conditioner 130, when driving air-conditioner 130 to run, has certain loss.Therefore, when the power output of photovoltaic cell 110 is greater than the operate power preset value of air-conditioner 130, can control PV air-conditioner systematic evaluation is the first duty.
It should be noted that, preset value is that its span can be [20W, 50W] for driving the postrun dump power of air-conditioner 130 in the power output of photovoltaic cell 110.
When power output is equal to or less than operate power, and operate power non-vanishing time, first control module is by the input of control first change-over switch 121 and the first output conducting of the first change-over switch 121, and the second output conducting of the first output of the second change-over switch 122 and the second change-over switch 122, control PV air-conditioner system 100 and switch to the second duty.Wherein, the second duty is: photovoltaic cell 110 and electrical network 140 are powered to air-conditioner 130 simultaneously.
When operate power is zero, first control module is by the input of control first change-over switch 121 and the second output conducting of the first change-over switch 121, and the second output conducting of the input of the second change-over switch 122 and the second change-over switch 122, control PV air-conditioner system 100 and switch to the 3rd duty.Wherein, the 3rd duty is: the power output of photovoltaic cell 110 inputs to electrical network 140.
It by arranging the first change-over switch 121 and the second change-over switch 122 in photovoltaic DC-to-AC converter 120, by the power output of controller 150 according to the photovoltaic cell 110 detected and the operate power of air-conditioner 130, control the first change-over switch 121 and the second change-over switch 122, realize the switching of the duty controlling PV air-conditioner system 100.And then the duty different according to PV air-conditioner system 100, MPPT maximum power point tracking is carried out to photovoltaic cell 110, the power output of photovoltaic cell 110 is maximized, effectively make use of the power output of photovoltaic cell 110, improve the efficiency of PV air-conditioner system 100.
See Fig. 1, it should be noted that, photovoltaic DC-to-AC converter 120 also comprises DC (Direct Current, direct current)-DC boosting loop 124, current filter 125 and EMC (Electro Magnetic Compatibility) filter circuit 126.
The input in DC-DC boosting loop 124 is connected with the output of photovoltaic cell 110, and the output in DC-DC boosting loop 124 is connected with the input of the first change-over switch 121.After luminous energy is converted to electric energy by photovoltaic cell 110, flows to DC-DC loop 124, the DC-DC DC voltage that exported by photovoltaic cell 110 of loop 124 that boosts that boosts and carry out being increased to the voltage that suitable combining inverter 123 or air-conditioner 130 run.
When the power output of photovoltaic cell 110 inputs to electrical network 140, namely when photovoltaic cell 110 carries out grid-connected process, direct current after combining inverter 123 carries the rising of coming by loop 124 of boosting to DC-DC carries out inversion (can be PWM (Pulse Width Modulation) pulse width modulation), is delivered in current filter 125 after making direct current change alternating current into.
The input of current filter 125 is connected with the output of combining inverter 123, and the output of current filter 125 is connected with the input of the second change-over switch 122.Current filter 125 carries out filtering to alternating current, after making the phase place of alternating current and the arc in phase of electrical network 140, is delivered to EMC filter circuit 126 after receiving the alternating current after pwm pulse width modulated of combining inverter 123 conveying.
The input of EMC filter circuit 126 is connected with the second output of the second change-over switch 122, and the output of EMC filter circuit 126 is connected with the input of electrical network 140.EMC filter circuit 126 receive current filter 125 carry with the alternating voltage of the arc in phase of electrical network 140 after, after the radiation that the disturbing wave produced by combining inverter 123, air-conditioner 130 produce involves the harmonic filtration that exceeds standard importing electrical network 140 into, alternating voltage is delivered to electrical network 140, completes the grid-connected of photovoltaic cell 110.
Wherein, DC-DC boosts between loop 124 and the first change-over switch 121 and is parallel with the first electric capacity C1, and the first electric capacity C1 is used for stablizing busbar voltage, maintains the stable of PV air-conditioner system 100.
Further, be parallel with the second electric capacity C2 equally between the first change-over switch 121 and the compressor inverter 131 in air-conditioner 130, the effect of the second electric capacity C2, equally for stable busbar voltage, maintains the stable of PV air-conditioner system 100.
When the first control module of controller 150 is according to power output and operate power, after control PV air-conditioner system 100 switches to different duties, the duty different according to PV air-conditioner system 100, carries out MPPT maximum power point tracking to photovoltaic cell 110.Wherein, the method that interval scan and variable step disturbance view mode can be adopted to combine is carried out.Namely at set intervals, single pass is carried out to the output voltage of photovoltaic cell 110.Scan mode adopts variable step disturbance view mode.Concrete:
See Fig. 2, when PV air-conditioner system 100 switches to the first duty, now, photovoltaic cell 110 is powered to air-conditioner 130, runs to drive air-conditioner 130.Wherein, the input of the first change-over switch 121 and the first output conducting, it is path that DC-DC boosts between loop 124 and the compressor inverter 131 of air-conditioner 130, the DC voltage that photovoltaic cell 110 exports boosts after the rising of loop 124 through DC-DC, the compressor inverter 131 of air-conditioner 130 is directly delivered to by the first change-over switch 121, drive the motor 133 of air-conditioner 130 to operate, realize the operation of air-conditioner 130.
When PV air-conditioner system 100 switches to the first duty, as a kind of embodiment of photovoltaic cell 110 being carried out to MPPT maximum power point tracking, the first tracking module comprises first and chooses unit and the first scanning element.
First chooses unit, for when PV air-conditioner system 100 switches to the first duty, chooses the first sweep spacing according to operate power.
First scanning element, for every the first sweep spacing, adopts the output voltage of variable step disturbance view mode to photovoltaic cell 110 to scan, observes power output.
First scanning element comprises the first setting subelement, when scanning for adopting the output voltage of variable step disturbance view mode to photovoltaic cell 110, according to operate power setting disturbance step-length.
Due to when PV air-conditioner system 100 switches to the first duty, air-conditioner 130 is in the operation phase.Sweep spacing and disturbance step-length are all by the impact (namely relevant with the operate power of air-conditioner 130) of the operate power of air-conditioner 130.Therefore, sweep spacing and setting disturbance step-length can be chosen according to the operate power of air-conditioner 130.If the operate power of air-conditioner 130 too large (i.e. heavier loads), now still the output voltage of photovoltaic cell 110 is scanned, very likely cause the busbar voltage wide fluctuations of PV air-conditioner system 100, thus affect the normal operation of air-conditioner 130.Therefore, when the operate power of air-conditioner 130 is too large, the scanning of the scanning not carrying out the output voltage of photovoltaic cell 110 or the output voltage only carrying out photovoltaic cell 110 in small voltage scope, to ensure the normal operation of air-conditioner 130.
See Fig. 3, when PV air-conditioner system 100 switches to the second duty, now, photovoltaic cell 110 and electrical network 140 are powered to air-conditioner 130 simultaneously, run to drive air-conditioner 130.Wherein, the input of the first change-over switch 121 and the first output conducting of the first change-over switch 121, make path between DC-DC boosting loop 124 and compressor inverter 131.Thus the DC voltage making photovoltaic cell 110 export is after DC-DC boosts loop 124 rising, be delivered to the compressor inverter 131 of air-conditioner 130 through the first change-over switch 121, drive motors 133 operates, and realizes the operation of air-conditioner 130.
Meanwhile, the first output of the second change-over switch 122 and the second output conducting of the second change-over switch 122, path between the power factor corrector 132 making electrical network 140 and air-conditioner 130.Thus the voltage making electrical network 140 export is after EMC filtering 126, be delivered to power factor corrector 132 and compressor inverter 131 through the second change-over switch 122, drive motors 133 operates, and realizes the operation of air-conditioner 130.
When PV air-conditioner system 100 switches to the second duty, as a kind of embodiment of photovoltaic cell 110 being carried out to MPPT maximum power point tracking, the first tracking module also comprises second and chooses unit and the second scanning element.
Second chooses unit, when switching to the second duty for PV air-conditioner system 100, chooses the second sweep spacing according to the maximized mode of the power output of photovoltaic cell 110.
Second scanning element, for every the second sweep spacing, adopts the output voltage of variable step disturbance view mode to photovoltaic cell 110 to scan, observes power output.
Second scanning element comprises the second setting subelement, sets disturbance step-length for maximizing mode according to the power output of photovoltaic cell 110.
When PV air-conditioner system 100 switches to the second duty, now photovoltaic cell 110 and electrical network 140 are powered to air-conditioner 130 simultaneously.Sweep spacing when scanning the output voltage of photovoltaic cell 110 and disturbance step-length are all chosen according to the maximized mode of the power output of photovoltaic cell 110 and are set, make the power output of photovoltaic cell 110 be peak power output in real time, thus reduce the power output of electrical network 140.It, while the saving electricity charge, effectively make use of the power output of photovoltaic cell 110, improves the efficiency of PV air-conditioner system 100.
See Fig. 4, when PV air-conditioner system 100 switches to the 3rd duty, now, the input of the first change-over switch 121 and the second output conducting of the first change-over switch 121, it is path that DC-DC is boosted between loop 124 and combining inverter 123.The input of the second change-over switch 122 is connected with the second output of the second change-over switch 122, makes path between current filter 125 and EMC filter circuit 126.Thus the DC voltage making photovoltaic cell 110 export is after DC-DC boosts loop 124, first change-over switch 121, combining inverter 123, current filter 125, second change-over switch 122 and EMC filter circuit 126, be connected to the grid 140, complete the grid-connected process of photovoltaic cell 110.
When PV air-conditioner system 100 switches to the second duty, as a kind of embodiment of photovoltaic cell 110 being carried out to MPPT maximum power point tracking, the first tracking module also comprises the 3rd and chooses unit and the 3rd scanning element.
3rd chooses unit, when switching to the 3rd duty for PV air-conditioner system 100, chooses the 3rd sweep spacing according to the maximized mode of the power output of photovoltaic cell 110.
3rd scanning element, for every the 3rd sweep spacing, adopts the output voltage of variable step disturbance view mode to photovoltaic cell 110 to scan, observes power output.
3rd scanning element comprises the 3rd setting subelement, for setting disturbance step-length according to the maximized mode of the power output of photovoltaic cell 110.
When PV air-conditioner system 100 switches to the 3rd duty, now, air-conditioner 130 is in the shutdown stage, and its operate power is close or equal zero.Sweep spacing when scanning the output voltage of photovoltaic cell 110 and disturbance step-length can be chosen according to the maximized mode of the power output of photovoltaic cell 110 and set equally, the power output of photovoltaic cell 110 is made to be peak power output in real time, thus the peak power output of photovoltaic cell 110 is all inputed to electrical network 140, obtain maximum generated output.Equally effectively make use of the power output of photovoltaic cell 110, improve the efficiency of PV air-conditioner system 100.
By arranging controller 150, PV air-conditioner system 100 being switched to three kinds of different duties by controller 150, effectively prevent the phenomenon of energy waste.Simultaneously, the duty different according to PV air-conditioner system 100 3 kinds, MPPT maximum power point tracking is carried out to photovoltaic cell 110, not only achieve the photovoltaic cell 110 maximized object of power output in real time, also efficiently utilize the power output of photovoltaic cell 110, improve the efficiency of PV air-conditioner system 100.
But while carrying out MPPT maximum power point tracking to photovoltaic cell 110, the impact that the busbar voltage of PV air-conditioner system 100 also can be subject to the power output of photovoltaic cell 110 is fluctuated to some extent, thus affects the stability of PV air-conditioner system 100.Therefore, in order to ensure the stability of PV air-conditioner system 100, as the PV air-conditioner system 100 of another specific embodiment, its controller 150 also comprises the second control module, for the duty different according to PV air-conditioner system 100, control the busbar voltage of PV air-conditioner system 100.Make PV air-conditioner system 100 more stable, ensure that the normal operation of PV air-conditioner system 100.
Concrete, when PV air-conditioner system 100 switches to the first duty, as a specific embodiment of PV air-conditioner system 100, second control module comprises the first control unit, when switching to the first duty for PV air-conditioner system 100, according to power output and operate power control bus voltage.
See Fig. 2, due to PV air-conditioner system 100 switch to the first duty time, only powered by photovoltaic cell 110 pairs of air-conditioners 130.Now, the busbar voltage of PV air-conditioner system 100 is by the operate power joint effect of prime booster circuit (i.e. the power output of photovoltaic cell 110) and air-conditioner 130.Therefore, control bus voltage is carried out according to power output and operate power, make busbar voltage enough high with the normal operation ensureing air-conditioner 130, realize the power output of photovoltaic cell 110 and the operate power real-time matching of air-conditioner 130, ensure that when being powered to air-conditioner 130 by photovoltaic cell 110, the normal operation of air-conditioner 130.
When PV air-conditioner system 100 switches to the second duty, as the another specific embodiment of PV air-conditioner system 100, the second control module also comprises the first detecting unit, the second control unit and the 3rd control unit.
First detecting unit, when switching to the second duty for PV air-conditioner system 100, detects the power factor corrector 132 whether enabled in air-conditioner 130.
Second control unit, for when not enabled power factor corrector 132, according to the first Control of Voltage busbar voltage that the electrical network 140 after rectification exports, and adjusts the power output of photovoltaic cell 110 until busbar voltage is less than or equal to specified busbar voltage.
3rd control unit, for when enabling power factor corrector 132, according to the second Control of Voltage busbar voltage that power factor corrector 132 exports.
See Fig. 3, when PV air-conditioner system 100 switches to the second duty, now, photovoltaic cell 110 and electrical network 140 are powered to air-conditioner 130 simultaneously.When electrical network 140 is powered to air-conditioner 130, power factor corrector (Power Factor Correction, PFC) 132 likely opened by air-conditioner 130, after correcting the first voltage of electrical network 140 output, input to air-conditioner 130 again, drive air-conditioner 130 to run.Therefore, first by detecting whether enable power factor corrector 132.
When not enabled power factor corrector 132 being detected, now, the first voltage influence of exporting primarily of electrical network 140 of busbar voltage.Therefore, mainly according to the busbar voltage of the first Control of Voltage PV air-conditioner system 100 of electrical network 140 output.Meanwhile, in this process, because photovoltaic cell 110 also powers to air-conditioner 130.So busbar voltage also can be subject to the impact of the power output of photovoltaic cell 110.Due to the impact of the power output of photovoltaic cell 110, busbar voltage likely exceedes specified busbar voltage, causes busbar voltage to exceed bus capacitor withstand voltage, thus causes bus capacitor (i.e. the first electric capacity C1 and the second electric capacity C2) to collapse.Therefore, also need the power output adjusting photovoltaic cell 110, ensureing that the power output of photovoltaic cell 110 is maximized while, also make busbar voltage be no more than specified busbar voltage, ensure that the stability of PV air-conditioner system 100.
Wherein, it should be noted that, specified busbar voltage is generally 380V.
When detect enable power factor corrector 132 time, now, electrical network 140 export the first voltage carry out PFC through power factor corrector 132.Busbar voltage is then primarily of the second Control of Voltage that power factor corrector 132 exports.Therefore, second voltage that can export according to power factor corrector 132 carrys out control bus voltage, maintains the stability of PV air-conditioner system 100.When being carried out control bus voltage by power factor corrector 132 and still can not suppressing the rising of busbar voltage, then close power factor corrector 132, the control of busbar voltage is carried out according to the situation of not enabled power factor corrector 132, maintain the stability of PV air-conditioner system 100 equally, ensure that the safe operation of PV air-conditioner system 100, thus avoid unnecessary electrical hazard.
When PV air-conditioner system 100 switches to the 3rd duty, as a specific embodiment again of PV air-conditioner system 100, second control module also comprises the 4th control unit, when switching to the 3rd duty for PV air-conditioner system 100, the current amplitude that combining inverter 123 in real-time adjustment PV air-conditioner system 100 exports, control bus voltage.
See Fig. 4, when PV air-conditioner system 100 switches to the 3rd duty, now, air-conditioner 130 is in the shutdown stage, and its operate power is close or equal zero.The power output of photovoltaic cell 110 all inputs to electrical network 140, carries out grid-connected process.The busbar voltage of PV air-conditioner system 100 then controls primarily of rear class outer voltage, the alternating current control after namely changing primarily of the direct current exported through the 123 pairs of photovoltaic cells 110 of the combining inverter in PV air-conditioner system 100.Therefore, by adjusting the current amplitude of combining inverter 123 output in real time to maintain busbar voltage, and then the stable of PV air-conditioner system 100 is maintained.
It detects the power output of photovoltaic cell, the operate power of the first monitoring module monitors air-conditioner by arranging controller in PV air-conditioner system by the first detection module in controller.By the first control module according to the power output detected and the operate power monitored, controlling PV air-conditioner systematic evaluation is different duties.And by the first tracking module duty different according to PV air-conditioner system, MPPT maximum power point tracking is carried out to photovoltaic cell, realizes effective utilization of the power output of photovoltaic cell, thus improve the efficiency of PV air-conditioner system.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (9)
1. a PV air-conditioner system, comprise photovoltaic cell, photovoltaic DC-to-AC converter and air-conditioner, described photovoltaic cell is connected with described air-conditioner and electrical network respectively by described photovoltaic DC-to-AC converter, it is characterized in that, also comprise controller, described controller comprises first detection module, the first monitoring modular, the first control module and the first tracking module, wherein:
Described first detection module, for detecting the power output of described photovoltaic cell;
Described first monitoring modular, for monitoring the operate power of described air-conditioner;
Described first control module, for according to described power output and described operate power, controlling described PV air-conditioner systematic evaluation is different duties;
Described first tracking module, for according to described different duty, carries out MPPT maximum power point tracking to described photovoltaic cell.
2. PV air-conditioner system according to claim 1, is characterized in that, described controller also comprises the second control module, for according to described different duty, controls the busbar voltage of described PV air-conditioner system.
3. PV air-conditioner system according to claim 2, is characterized in that, described photovoltaic DC-to-AC converter comprises the first change-over switch and the second change-over switch, wherein:
The input of described first change-over switch is connected with the output of described photovoltaic cell, first output of described first change-over switch is connected with the compressor inverter of described air-conditioner, and the second output of described first change-over switch is connected with the input of the combining inverter in described photovoltaic DC-to-AC converter;
The input of described second change-over switch is connected with the output of described combining inverter, first output of described second change-over switch is connected with the power factor corrector in described air-conditioner, and the second output of described second change-over switch is connected with the input of described electrical network;
Described first control module is connected with described first change-over switch and described second change-over switch respectively;
When described power output is greater than described operate power, and described operate power non-vanishing time, described first control module is by controlling the input of described first change-over switch and the first output conducting of described first change-over switch, and controlling described PV air-conditioner systematic evaluation is the first duty;
Described first duty is: described supplying power for photovoltaic cell gives described air-conditioner;
When described power output is equal to or less than described operate power, and described operate power non-vanishing time, described first control module is by controlling the input of described first change-over switch and the first output conducting of described first change-over switch, and the second output conducting of the first output of described second change-over switch and described second change-over switch, controlling described PV air-conditioner systematic evaluation is the second duty;
Described second duty is: described photovoltaic cell and described electrical network are powered to described air-conditioner simultaneously;
When described operate power is zero, described first control module is by controlling the input of described first change-over switch and the second output conducting of described first change-over switch, and the second output conducting of the input of described second change-over switch and described second change-over switch, controlling described PV air-conditioner systematic evaluation is the 3rd duty;
Described 3rd duty is: the described power output of described photovoltaic cell inputs to described electrical network.
4. PV air-conditioner system according to claim 3, is characterized in that, described first tracking module comprises first and chooses unit and the first scanning element;
Described first chooses unit, for when described PV air-conditioner systematic evaluation is described first duty, chooses the first sweep spacing according to described operate power;
Described first scanning element, for every described first sweep spacing, adopts the output voltage of variable step disturbance view mode to described photovoltaic cell to scan, observes described power output;
Described first scanning element comprises the first setting subelement, when scanning for adopting the described output voltage of described variable step disturbance view mode to described photovoltaic cell, according to described operate power setting disturbance step-length.
5. PV air-conditioner system according to claim 4, is characterized in that, described first tracking module also comprises second and chooses unit and the second scanning element;
Described second chooses unit, when being described second duty for described PV air-conditioner systematic evaluation, chooses the second sweep spacing according to the maximized mode of the power output of described photovoltaic cell;
Described second scanning element, for every described second sweep spacing, adopts the described output voltage of described variable step disturbance view mode to described photovoltaic cell to scan, observes described power output;
Described second scanning element comprises the second setting subelement, sets described disturbance step-length for maximizing mode according to the described power output of described photovoltaic cell.
6. PV air-conditioner system according to claim 5, is characterized in that, described first tracking module also comprises the 3rd and chooses unit and the 3rd scanning element;
Described 3rd chooses unit, and when being described 3rd duty for described PV air-conditioner systematic evaluation, the maximized mode of described power output according to described photovoltaic cell chooses the 3rd sweep spacing;
Described 3rd scanning element, for every described 3rd sweep spacing, adopts the described output voltage of described variable step disturbance view mode to described photovoltaic cell to scan, observes described power output;
Described 3rd scanning element comprises the 3rd setting subelement, sets described disturbance step-length for the maximized mode of described power output according to described photovoltaic cell.
7. PV air-conditioner system according to claim 3, it is characterized in that, described second control module comprises the first control unit, when being described first duty for described PV air-conditioner systematic evaluation, controls described busbar voltage according to described power output and described operate power.
8. PV air-conditioner system according to claim 7, is characterized in that, described second control module also comprises the first detecting unit, the second control unit and the 3rd control unit;
Described first detecting unit, when being described second duty for described PV air-conditioner systematic evaluation, detects the described power factor corrector whether enabled in described air-conditioner;
Described second control unit, for when described in not enabled during power factor corrector, according to busbar voltage described in the first Control of Voltage that the described electrical network after rectification exports, and adjust the described power output of described photovoltaic cell until described busbar voltage is less than or equal to specified busbar voltage;
Described 3rd control unit, for when enabling described power factor corrector, according to busbar voltage described in the second Control of Voltage that described power factor corrector exports.
9. PV air-conditioner system according to claim 8, it is characterized in that, described second control module also comprises the 4th control unit, when being described 3rd duty for described PV air-conditioner systematic evaluation, the current amplitude that described combining inverter in real-time adjustment described PV air-conditioner system exports, controls described busbar voltage.
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| CN201420360318.6U CN204043127U (en) | 2014-07-01 | 2014-07-01 | PV air-conditioner system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104110795A (en) * | 2014-07-01 | 2014-10-22 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system and control method thereof |
| WO2016004896A1 (en) * | 2014-07-11 | 2016-01-14 | 珠海格力电器股份有限公司 | Photovoltaic inverter and air conditioner |
| WO2016041413A1 (en) * | 2014-09-19 | 2016-03-24 | 珠海格力电器股份有限公司 | Photovoltaic air-conditioning system and photovoltaic air conditioner having same |
| CN106739942A (en) * | 2017-01-04 | 2017-05-31 | 上海爱斯达克汽车空调系统有限公司 | A kind of power control system, heat exchanger and vehicle |
| CN109067144A (en) * | 2018-08-31 | 2018-12-21 | 广东之业叠加合创量子科技有限公司 | Photovoltaic distribution, which is released, can amplify electricity generation system |
| FR3076106A1 (en) * | 2017-12-22 | 2019-06-28 | Atlantic Climatisation & Ventilation | DEVICE FOR CONTROLLING AN ENGINE |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104110795A (en) * | 2014-07-01 | 2014-10-22 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system and control method thereof |
| CN104110795B (en) * | 2014-07-01 | 2017-01-11 | 珠海格力电器股份有限公司 | Photovoltaic air conditioning system and control method thereof |
| WO2016004896A1 (en) * | 2014-07-11 | 2016-01-14 | 珠海格力电器股份有限公司 | Photovoltaic inverter and air conditioner |
| WO2016041413A1 (en) * | 2014-09-19 | 2016-03-24 | 珠海格力电器股份有限公司 | Photovoltaic air-conditioning system and photovoltaic air conditioner having same |
| US10666056B2 (en) | 2014-09-19 | 2020-05-26 | Gree Electric Appliances, Inc. Of Zhuhai | Photovoltaic air-conditioning system and photovoltaic air conditioner having same |
| CN106739942A (en) * | 2017-01-04 | 2017-05-31 | 上海爱斯达克汽车空调系统有限公司 | A kind of power control system, heat exchanger and vehicle |
| FR3076106A1 (en) * | 2017-12-22 | 2019-06-28 | Atlantic Climatisation & Ventilation | DEVICE FOR CONTROLLING AN ENGINE |
| CN109067144A (en) * | 2018-08-31 | 2018-12-21 | 广东之业叠加合创量子科技有限公司 | Photovoltaic distribution, which is released, can amplify electricity generation system |
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