WO2015106638A9 - Photovoltaic air-making system - Google Patents

Photovoltaic air-making system Download PDF

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Publication number
WO2015106638A9
WO2015106638A9 PCT/CN2015/000034 CN2015000034W WO2015106638A9 WO 2015106638 A9 WO2015106638 A9 WO 2015106638A9 CN 2015000034 W CN2015000034 W CN 2015000034W WO 2015106638 A9 WO2015106638 A9 WO 2015106638A9
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WO
WIPO (PCT)
Prior art keywords
battery
air
photovoltaic
making system
inverter
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PCT/CN2015/000034
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French (fr)
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WO2015106638A1 (en
Inventor
Dianjun LIU
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Beijing Hengqi New Energy Technologies Ltd.
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Publication of WO2015106638A1 publication Critical patent/WO2015106638A1/en
Publication of WO2015106638A9 publication Critical patent/WO2015106638A9/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/20—Systems characterised by their energy storage means
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/38—Energy storage means, e.g. batteries, structurally associated with PV modules
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/50—Energy storage in industry with an added climate change mitigation effect

Definitions

  • This invention relates to a photovoltaic air-making system, and belongs to the solar energy utilization technical field.
  • the photovoltaic direct current comes from the traditional solar photovoltaic generating station changes to alternating current which is being the same frequency and the same phase with the city electricity by the inverter, so as to join the city electricity net, and then the city electricity net deploys the current to users.
  • the alternating current comes from the photovoltaic station is difficult to being the same frequency and the same phase with the city electricity. Therefore, the alternating current comes from the photovoltaic station may be the impact to the city electric net, so most electrical distribution companies do not allow the electric energy comes from the photovoltaic station join their electricity net.
  • Caused energy comes from the photovoltaic generating station waste.
  • the object of the invention of this application is to provide a photovoltaie air-making system, which converting the photovoltaic energy into potential energy of air, transporting compressed air to some air users.
  • a photovoltaic air-making system which comprises photovoltaic battery, an inverter, an air compressor and an air storage container, wherein photovoltaic battery is used for converting sun photovoltaic energy into direct current energy, the inverter is used for converting the direct current energy into alternating current energy, and the air compressor is used for compressing the air through the alternating current energy and storing the compressed air into the air storage container.
  • the photovoltaic air-making system further comprises a pressure measure system, a compressor control module, wherein the pressure measure system is used for detecting the pressure of the compressed air in the air storage container, changing the said pressure to electric control signal and sending the said electric control signal to the compressor control module.
  • the compressor control module controls the output voltage and frequency of the inverter and the work status of the air compressor based on the said electric control signal.
  • the photovoltaic air-making system further comprises a battery charger, a first battery, a transfer switch of the first battery, a second battery, a transfer switch of the second battery and a battery management module, wherein the battery management module provides a first transfer control signal to the transfer switch of the first battery in order to make the battery charger charge the first battery and the second battery alternately through the transfer switch of the first battery.
  • the battery management module also provides a second transfer control signal to the transfer switch of the second battery in order to make the first battery and the second battery provide the inverter direct current energy alternately through the transfer switch of the second battery.
  • the photovoltaic air-making system further comprises a MPPT control module, which adjusts the power of the battery charger depends on the sampling values of the photovoltaic battery’s output voltage and output current, in order to make the photovoltaic battery always being on the maximum output power state when the environment temperature or the light intensity is changed, improve the use efficiency of the photovoltaic battery.
  • a MPPT control module which adjusts the power of the battery charger depends on the sampling values of the photovoltaic battery’s output voltage and output current, in order to make the photovoltaic battery always being on the maximum output power state when the environment temperature or the light intensity is changed, improve the use efficiency of the photovoltaic battery.
  • the photovoltaie air-making system further comprises a directly-feedback switch, and the MPPT control module controls the directly-feedback switch on and off depends on the photovoltaic battery’s output voltage and current sampling values.
  • the photovoltaic air-making system further comprises a local controller, which comprises a man-machine interface and a communication control interface.
  • the said man-machine interface is used for connecting with the key-press and the display.
  • the communication control interface is used for connecting with the local personal computer and/or the internet.
  • the photovoltaic air-making system of the invention converts the photovoltaic energy into potential energy of air, and directly transports compressed air for some air users.
  • FIG. 1 is an entire schematic view of a photovoltaic air-making system provided by the invention.
  • FIG. 2 is a structural block view of a battery charger controller provided by the invention.
  • FIG. 3 is a working flow chart of a MPPT control module provided by the invention.
  • FIG. 4 is a circuit diagram of a charge-discharge system provided by the invention.
  • FIG. 5 is a working flow chart of a battery management control module provided by the invention.
  • FIG. 6 is a schematic view of an air compression system provided by the invention.
  • FIG. 7 is a working flow chart of a compressor control module provided by the invention.
  • FIG. 1 is an entire schematic view of photovoltaic air-making system provided by the invention.
  • the photovoltaic air-making system provided by the invention comprises photovoltaic battery, an inverter, an air compressor and an air storage container, wherein photovoltaic battery is used for converting sun photovoltaic energy into direct current energy.
  • the inverter is used for converting the direct current energy into alternating current energy.
  • the air compressor is used for compressing the air through the alternating current energy and storing the compressed air into the air storage container.
  • the photovoltaic air-making system further comprises a pressure measure system, and a compressor control module, wherein the pressure measure system is used for detecting the pressure of the compressed air in the air storage container and changing the said pressure to electric control signal and sending the said electric control signal to the compressor control module.
  • the compressor control module controls the output voltage of the inverter and the work status of the air compressor based on the said electric control signal.
  • the photovoltaic air-making system further comprises a battery charger, a first battery, a transfer switch of the first battery, a second battery, a transfer switch of the second battery and a battery management module, wherein the battery management module provides a first transfer control signal to the transfer switch of the first battery in order to make the battery charger charge the first battery and the second battery alternately through the transfer switch of the first battery.
  • the battery management module also provides a second transfer control signal to the transfer switch of the second battery in order to make the first battery and the second battery provide the inverter direct current energy alternately through the transfer switch of the second battery.
  • the photovoltaic air-making system further comprises a MPPT control module, which adjusts the power of the battery charger depends on the photovoltaic battery’s output voltage and current sampling values, in order to make the photovoltaic battery always being on the maximum output power state when the environment temperature or the light intensity is changed, improve the use efficiency of the photovoltaic battery.
  • the photovoltaic air-making system further comprises a direcfiy-feedback switch, and the MPPT control module controls the directly-feedback switch on and off depends on the photovoltaic battery’s output voltage and current sampling values.
  • the photovoltaic air-making system further comprises a local controller, which comprises a man-machine interface and a communication control interface, the said man-machine interface is used for connecting with the key-press and the display, the communication control interface is used for connecting with the local personal computer and/or the intemet.
  • a local controller which comprises a man-machine interface and a communication control interface
  • the said man-machine interface is used for connecting with the key-press and the display
  • the communication control interface is used for connecting with the local personal computer and/or the intemet.
  • FIG. 2 is a structural block view of a battery charger controller provided by the invention.
  • the MPPT control module provides high and low level signal to the drive transistor TR1 based on the value of the sampling voltage and sampling current. When the product of the sampling voltage and the sampling current is higher and exceeds a certain value, the MPPT control module provides a high level signal to the transistor TR1.
  • the transistor TR1 is turned on, and which collecting electrode has current through by.
  • the relay J3’s line package which is connected to the collecting electrode has current through by too, which normally open dot is turned on.
  • One part of the output power of the photovoltaic battery is used for charging the battery, and the other part is supplied to the inverter to provide energy for the air compressor.
  • the MPPT control module only supplies the energy to the battery charger.
  • the battery charger charges the first battery and the second battery alternately through the transfer switch.
  • the first battery and the second battery alternately provide direct current to the inverter.
  • the first battery and the second battery are not used to storing electrical energy, but used to stabilize output voltage of the inverter andensure that the air compressor is work properly. Thence the battery capacity is very low.
  • FIG. 3 is a working flow chart of a MPPT control module provided by the invention. As shown in FIG. 3, MPPT control process includes:
  • the timer interrupts service program includes:
  • MPPT algorithm includes:
  • FIG. 4 is a circuit diagram of a charge-discharge system provided by the invention.
  • charge-discharge system comprises a battery charger, a first battery, a second battery, a first transfer switch, driver circuit of the first transfer switch, a second transfer switch, driver circuit of the second transfer switch, sampling circuit of the first battery, sampling circuit of the second battery and a battery management module.
  • the sampling circuit of the first battery comprises resistor R4 and R5. After the resistor R4 and the resistor R5 connect in series, they across the first battery both ends in parallel, of whose the voltage to earth of the intermediate node is V 1 .
  • the sampling circuit of the second battery comprises resistor R6 and R7.
  • the drive circuit to drive the first transfer switch comprises a transistor TR2 and a first relay J1.
  • the first transfer switch is the transfer contact point of the first relay J1.
  • the drive circuit to drive the second transfer switch comprises a transistor TR3 and a second relay J2.
  • the second transfer switch is the transfer contact point of the first relay J2.
  • FIG. 5 is a working flow chart of a battery management control module provided by the invention. As shown in FIG. 5, the battery management control module’s working process includes:
  • the first battery 1 provides electrical energy to the inverter; battery charger is used to recharge the second battery 2;
  • the second battery 2 provides electrical energy to the inverter; battery charger is used to recharge the first battery 1;
  • FIG. 6 is a schematic view of an air compression system provided by the invention.
  • the said air compression system comprises an inverter, an air compressor, an air storage container and a compressor control module, wherein, the inverter is used for converting the direct voltage into three-phase AC voltage and providing the three-phase AC voltage to air compressor.
  • There is a voltage test circuit set in the input terminal of the inverter which is used for testing the input DC voltage of the inverter.
  • the air compressor is used for compressing the normal-pressure air and storing the compressed air into the air storage container.
  • a speed sensor is set beside the air compressor revolving shaft, which is used for testing the speed of the air compressor.
  • a pressure sensor is set on the sidewall of the air storage container, which is used for testing the pressure of the compressed air stored in the air storage container.
  • the compressor control module provides control signals to inverter based on the signal from pressure sensor, the voltage test and speed sensor.
  • FIG. 7 is a working flow chart of a compressor control module provided by the invention. As shown in FIG. 7, the compressor control module’s working process includes:

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A photovoltaic air-making system which belongs to the photovoltaic technical field is provided. The photovoltaic air-making system comprises a photovoltaic battery, an inverter, an air compressor and an air storage container. The photovoltaic battery is used for converting sun photovoltaic energy into direct current energy, the inverter is used for converting the direct current energy into alternating current energy, and the air compressor is used for compressing the air through the alternating current energy and storing the compressed air into the air storage container. The photovoltaic air-making system can store or convey optical energy in an air energy mode.

Description

A photovoltaic air-making system Technical Field
This invention relates to a photovoltaic air-making system， and belongs to the solar energy utilization technical field.
Background
The photovoltaic direct current comes from the traditional solar photovoltaic generating station changes to alternating current which is being the same frequency and the same phase with the city electricity by the inverter， so as to join the city electricity net， and then the city electricity net deploys the current to users. But， the alternating current comes from the photovoltaic station is difficult to being the same frequency and the same phase with the city electricity. Therefore， the alternating current comes from the photovoltaic station may be the impact to the city electric net， so most electrical distribution companies do not allow the electric energy comes from the photovoltaic station join their electricity net. Caused energy comes from the photovoltaic generating station waste.
Content of the Invention
In order to overcome technical problems exist in prior art， the object of the invention of this application is to provide a photovoltaie air-making system， which converting the photovoltaic energy into potential energy of air， transporting compressed air to some air users.
In order to achieve said object of the invention， a photovoltaic air-making system is provided in the invention， which comprises photovoltaic battery， an inverter， an air compressor and an air storage container， wherein photovoltaic battery is used for converting sun photovoltaic energy into direct current energy， the inverter is used for converting the direct current energy into alternating current energy， and the air compressor is used for compressing the air through the alternating current energy and storing the compressed air into the air storage container.
Preferably， the photovoltaic air-making system further comprises a pressure measure system， a compressor control module， wherein the pressure measure system is used for detecting the pressure of the compressed air in the air storage container， changing the said pressure to electric control signal and sending the said electric control signal to the  compressor control module. The compressor control module controls the output voltage and frequency of the inverter and the work status of the air compressor based on the said electric control signal.
Preferably， the photovoltaic air-making system further comprises a battery charger， a first battery， a transfer switch of the first battery， a second battery， a transfer switch of the second battery and a battery management module， wherein the battery management module provides a first transfer control signal to the transfer switch of the first battery in order to make the battery charger charge the first battery and the second battery alternately through the transfer switch of the first battery. The battery management module also provides a second transfer control signal to the transfer switch of the second battery in order to make the first battery and the second battery provide the inverter direct current energy alternately through the transfer switch of the second battery.
Preferably， the photovoltaic air-making system further comprises a MPPT control module， which adjusts the power of the battery charger depends on the sampling values of the photovoltaic battery’s output voltage and output current， in order to make the photovoltaic battery always being on the maximum output power state when the environment temperature or the light intensity is changed， improve the use efficiency of the photovoltaic battery.
Preferably， the photovoltaie air-making system further comprises a directly-feedback switch， and the MPPT control module controls the directly-feedback switch on and off depends on the photovoltaic battery’s output voltage and current sampling values.
Preferably， the photovoltaic air-making system further comprises a local controller， which comprises a man-machine interface and a communication control interface. The said man-machine interface is used for connecting with the key-press and the display. The communication control interface is used for connecting with the local personal computer and/or the internet.
Compared with prior art， the photovoltaic air-making system of the invention converts the photovoltaic energy into potential energy of air， and directly transports compressed air for some air users.
Brief Description of the Drawings
FIG. 1 is an entire schematic view of a photovoltaic air-making system provided by the invention.
FIG. 2 is a structural block view of a battery charger controller provided by the invention；
FIG. 3 is a working flow chart of a MPPT control module provided by the invention；
FIG. 4 is a circuit diagram of a charge-discharge system provided by the invention；
FIG. 5 is a working flow chart of a battery management control module provided by the invention；
FIG. 6 is a schematic view of an air compression system provided by the invention；
FIG. 7 is a working flow chart of a compressor control module provided by the invention.
Description of the Embodiments
The invention will hereinafter be described in detail with reference to the accompanying drawings.
FIG. 1 is an entire schematic view of photovoltaic air-making system provided by the invention. As shown in FIG. 1， the photovoltaic air-making system provided by the invention， comprises photovoltaic battery， an inverter， an air compressor and an air storage container， wherein photovoltaic battery is used for converting sun photovoltaic energy into direct current energy. The inverter is used for converting the direct current energy into alternating current energy. And the air compressor is used for compressing the air through the alternating current energy and storing the compressed air into the air storage container. The photovoltaic air-making system further comprises a pressure measure system， and a compressor control module， wherein the pressure measure system is used for detecting the pressure of the compressed air in the air storage container and changing the said pressure to electric control signal and sending the said electric control signal to the compressor control module. The compressor control module controls the output voltage of the inverter and the work status of the air compressor based on the said electric control signal. The photovoltaic air-making system further comprises a battery charger， a first battery， a transfer switch of the first battery， a second battery， a transfer switch of the second battery and a battery management module， wherein the battery management module provides a first transfer control signal to the transfer switch of the first battery in order to make the battery charger charge the first battery and the second battery alternately through the transfer switch of the first battery. The battery  management module also provides a second transfer control signal to the transfer switch of the second battery in order to make the first battery and the second battery provide the inverter direct current energy alternately through the transfer switch of the second battery. The photovoltaic air-making system further comprises a MPPT control module， which adjusts the power of the battery charger depends on the photovoltaic battery’s output voltage and current sampling values， in order to make the photovoltaic battery always being on the maximum output power state when the environment temperature or the light intensity is changed， improve the use efficiency of the photovoltaic battery. The photovoltaic air-making system further comprises a direcfiy-feedback switch， and the MPPT control module controls the directly-feedback switch on and off depends on the photovoltaic battery’s output voltage and current sampling values. The photovoltaic air-making system further comprises a local controller， which comprises a man-machine interface and a communication control interface， the said man-machine interface is used for connecting with the key-press and the display， the communication control interface is used for connecting with the local personal computer and/or the intemet.
FIG. 2 is a structural block view of a battery charger controller provided by the invention. As shown in FIG. 2， after the resistor R1 and the resistor R2 connected in series， they across the photovoltaic battery both ends in parallel， of whose the intermediate node is used to take out sampling voltage of the photovoltaic voltage. The ground terminal of the photovoltaic battery takes out the sampling current through a current transformer. The MPPT control module provides high and low level signal to the drive transistor TR1 based on the value of the sampling voltage and sampling current. When the product of the sampling voltage and the sampling current is higher and exceeds a certain value， the MPPT control module provides a high level signal to the transistor TR1. The transistor TR1 is turned on， and which collecting electrode has current through by. And the relay J3’s line package which is connected to the collecting electrode has current through by too， which normally open dot is turned on. One part of the output power of the photovoltaic battery is used for charging the battery， and the other part is supplied to the inverter to provide energy for the air compressor. When the product of the sampling voltage and the sampling current is less than the certain value， the  MPPT control module only supplies the energy to the battery charger. The battery charger charges the first battery and the second battery alternately through the transfer switch. The first battery and the second battery alternately provide direct current to the inverter. The first battery and the second battery are not used to storing electrical energy， but used to stabilize output voltage of the inverter andensure that the air compressor is work properly. Thence the battery capacity is very low.
FIG. 3 is a working flow chart of a MPPT control module provided by the invention. As shown in FIG. 3， MPPT control process includes：
S01： Initialize the MPPT control module；
S02： Set the timer constant；
S03： Start the timer interrupts service program；
S04： Repeatedly run MPPT algorithm to find the maximum output power；
The timer interrupts service program includes：
S01： Turn off the directly-feedback switch J3；
S02： Run MPPT algorithm；
S03： Record the power of the maximum power point P1；
S04： Turn on the directly-feedback switch J3；
S05： Run MPPT algorithm；
S06： Record the power of the maximum power point P2；
S07： Determine whether P1 ＞ P2 established， if yes； execute S08， otherwise execute S09；
S08： Turn off the directly-feedback switch J3；
S09： Return to the main program.
MPPT algorithm includes：
S01： Measurement photovoltaic battery output voltage Vk and current Ik in time k， and calculate the output power Pk；
S02： Compare the output power Pk in time k and the output power Pk-1 in time k-1， if Pk＝Pk-1， record the power of the maximum power point， otherwise， execute S03；
S03： Determine whether Pk ＞ Pk-1 established， if yes； execute S04， otherwise execute S05；
S04： Let Vk ＝ Vk + ΔV， and then execute S06；
S05： Let Vk ＝ Vk -ΔV；
S06： Return to S01.
FIG. 4 is a circuit diagram of a charge-discharge system provided by the invention. As shown in FIG. 4， charge-discharge system comprises a battery charger， a first battery， a second battery， a first transfer switch， driver circuit of the first transfer switch， a second transfer switch， driver circuit of the second transfer switch， sampling circuit of the first battery， sampling circuit of the second battery and a battery management module. Wherein， the sampling circuit of the first battery comprises resistor R4 and R5. After the resistor R4 and the resistor R5 connect in series， they across the first battery both ends in parallel， of whose the voltage to earth of the intermediate node is V1. The sampling circuit of the second battery comprises resistor R6 and R7. After the resistor R6 and the resistor R7 connected in series， they across the second battery both ends in parallel， of whose the voltage to earth of the intermediate node is V2. The drive circuit to drive the first transfer switch comprises a transistor TR2 and a first relay J1. The first transfer switch is the transfer contact point of the first relay J1. The drive circuit to drive the second transfer switch comprises a transistor TR3 and a second relay J2. The second transfer switch is the transfer contact point of the first relay J2.
FIG. 5 is a working flow chart of a battery management control module provided by the invention. As shown in FIG. 5， the battery management control module’s working process includes：
S01： Initialize the battery management module；
S02： Measure the output voltage V1 of the first battery 1， and measure the output voltage V2 of the second battery 2；
S03： Determine whether V1 ＞ V2 established， if yes； execute S04， otherwise execute S06；
S04： Determine whether V1 ＞ VBL established， if yes； execute S05， otherwise execute S08， wherein， VBL is the certain value of the charging voltage；
S05： The first battery 1 provides electrical energy to the inverter； battery charger is used to recharge the second battery 2；
S06： Determine whether V2 ＞ VBL established， if yes； execute S07， otherwise execute S08；
S07： The second battery 2 provides electrical energy to the inverter； battery charger is used to recharge the first battery 1；
S08： Notify the compressor control module closing down and delay and waiting for；
S09： Return to S02.
FIG. 6 is a schematic view of an air compression system provided by the invention. As shown in FIG. 6， the said air compression system comprises an inverter， an air compressor， an air storage container and a compressor control module， wherein， the inverter is used for converting the direct voltage into three-phase AC voltage and providing the three-phase AC voltage to air compressor. There is a voltage test circuit set in the input terminal of the inverter， which is used for testing the input DC voltage of the inverter. The air compressor is used for compressing the normal-pressure air and storing the compressed air into the air storage container. A speed sensor is set beside the air compressor revolving shaft， which is used for testing the speed of the air compressor. A pressure sensor is set on the sidewall of the air storage container， which is used for testing the pressure of the compressed air stored in the air storage container. There further comprises an exhaust valve， which is used for exhausting the compressed air. The compressor control module provides control signals to inverter based on the signal from pressure sensor， the voltage test and speed sensor.
FIG. 7 is a working flow chart of a compressor control module provided by the invention. As shown in FIG. 7， the compressor control module’s working process includes：
S01： Testing the pressure from the pressure sensor in the air storage container；
S02： Determine whether the pressure is below lower limit， if yes； execute S03， otherwise execute S04；
S03： Determine whether the input voltage of the inverter is normal， if yes， according to the signal from the speed sensor to run the speed adjusting program， then execute S04； otherwise execute S07；
S04： Turn on the inverter and the air compressor， make the air compressor to fill the air storage container；
S05： Testing the pressure from the pressure sensor in the air storage container；
S06： Determine whether the pressure is upper limit， if yes； execute S07， otherwise return to S03；
S07： Stop the air compressor.
The working principle of the invention has been described herein above with reference to the accompanying drawings； however， the embodiment is used only for exemplarily illustrating the invention. The description is used only for explaining the claims. However， the scope of the invention is not limited to the description. Variations and alternatives that may be easily conceived within the technical scope disclosed in the invention by any person skilled in the art should be covered in the scope of the invention. Therefore， the scope of the invention should be accorded with the scope of the claims.

Claims (6)

  1. A photovoltaic air-making system， which comprises photovoltaic battery， an inverter， an air compressor and an air storage container， characterized in that， photovoltaic battery is used for converting sun photovoltaic energy into direct current energy， the inverter is used for converting the direct current energy into alternating current energy， and the air compressor is used for compressing the air through the alternating current energy and storing the compressed air into the air storage container.
  2. The photovoltaic air-making system of claim 1， characterized in that， the photovoltaic air-making system further comprises a pressure measure system， a compressor control module， wherein the pressure measure system is used for detecting the pressure of the compressed air in the air storage container and changing the said pressure to electric control signal and then sending the said electric control signal to the compressor control module， the compressor control module controls the output voltage of the inverter and the work status of the air compressor based on the said electric control signal.
  3. The photovoltaic air-making system of claim 2， characterized in that， the photovoltaic air-making system further comprises a battery charger， a first battery， a transfer switch of the first battery， a second battery， a transfer switch of the second battery and a battery management module， wherein the battery management module provides a first transfer control signal to the transfer switch of the first battery in order to make the battery charger charge the first battery and the second battery alternately through the transfer switch of the first battery， the battery management module also provides a second transfer control signal to the transfer switch of the second battery in order to make the first battery and the second battery provide the inverter direct current energy alternately through the transfer switch of the second battery.
  4. The photovoltaic air-making system of claim 3， characterized in that， the photovoltaic air-making system further comprises a MPPT control module， which adjusts the power of the battery charger depends on the photovoltaic battery’s output voltage and current sampling  values， in order to make the photovoltaic battery always being on the maximum output power state when the environment temperature or the light intensity is changed， improve the use efficiency of the photovoltaic battery.
  5. The photovoltaic air-making system of claim 4， characterized in that， the photovoltaic air-making system further comprises a directly-feedback switch， and the MPPT control module controls the directly-feedback switch on and offdepends on the photovoltaic battery’s output voltage and current sampling values.
  6. The photovoltaic air-making system of claim 5， characterized in that， the photovoltaic air-making system further comprises a local controller， which comprises a man-machine interface and a communication control interface， the said man-machine interface is used for connecting with the key-press and the display， the communication control interface is used for connecting with the local personal computer and/or the internet.
PCT/CN2015/000034 2014-01-20 2015-01-20 Photovoltaic air-making system WO2015106638A1 (en)

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