CN112803741A - Automatic start-stop control method and circuit for photovoltaic system inverter - Google Patents

Automatic start-stop control method and circuit for photovoltaic system inverter Download PDF

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Publication number
CN112803741A
CN112803741A CN202011641308.6A CN202011641308A CN112803741A CN 112803741 A CN112803741 A CN 112803741A CN 202011641308 A CN202011641308 A CN 202011641308A CN 112803741 A CN112803741 A CN 112803741A
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CN
China
Prior art keywords
inverter
stop control
voltage
battery
photovoltaic system
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Pending
Application number
CN202011641308.6A
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Chinese (zh)
Inventor
郭海亮
周贺继
刘家财
朱协宗
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Baykee Guangdong Technology Co ltd
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Baykee Guangdong Technology Co ltd
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Publication date
Application filed by Baykee Guangdong Technology Co ltd filed Critical Baykee Guangdong Technology Co ltd
Priority to CN202011641308.6A priority Critical patent/CN112803741A/en
Publication of CN112803741A publication Critical patent/CN112803741A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • 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
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Inverter Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A photovoltaic system inverter automatic start-stop control method and circuit relate to the technical field of photovoltaic system control. The automatic start-stop control method of the photovoltaic system inverter comprises the following steps of: voltage monitoring: a monitoring unit monitors a voltage of a cell of the photovoltaic system; starting and stopping control: and if the voltage of the battery is lower than the first voltage, the inverter is shut down. At night, the photovoltaic system cannot charge the battery, and the voltage of the battery needs to be monitored, because whether the voltage value of the battery is normal or not is an important basis for judging whether the current electric equipment can be normally powered or not. When the voltage drops below the first voltage, the current battery runs out of electric quantity and cannot supply power to the electric equipment continuously, the inverter needs to be turned off in time, the inverter is prevented from converting the electric quantity of the battery continuously so as to prevent the electric quantity of the battery from being exhausted, and the service life of the battery is prolonged.

Description

Automatic start-stop control method and circuit for photovoltaic system inverter
Technical Field
The invention relates to the technical field of photovoltaic system control.
Background
Photovoltaic power generation is a technology of directly converting light energy into electric energy by using the photovoltaic effect of a semiconductor interface. A key element of this technology is the solar cell. The solar cells are connected in series and then are packaged and protected to form a large-area solar cell module, and then the photovoltaic power generation device is formed by matching with components such as a power controller and the like.
It is a common architecture mode for photovoltaic systems to use photovoltaic power generation devices to charge batteries and then use the batteries to produce a steady current and voltage. Some electrical equipment need be supplied power in remote areas such as remote mountain areas, and photovoltaic system of this kind of framework mode also can be adopted generally, utilizes photovoltaic power generation device to supply power to electrical equipment after converting into the alternating current through the dc-to-ac converter after charging the battery earlier. However, the photovoltaic power generation device cannot charge the battery at night, so that the inverter converts the electric energy in the battery all the time, the electric energy in the battery is consumed all the time, the power of the load which can be loaded by the battery is gradually reduced, on one hand, the power demand of the electric equipment cannot be met, the electric equipment is powered off, on the other hand, the electric quantity of the battery is easily exhausted, and the service life of the battery is shortened.
Disclosure of Invention
In view of the above, the invention provides an automatic start-stop control method and circuit for a photovoltaic system inverter, which can prevent the electric quantity of a battery of the photovoltaic system from being exhausted at night and prolong the service life of the battery.
In order to solve the technical problems, the invention provides the following technical scheme.
1. The automatic start-stop control method of the photovoltaic system inverter comprises the following steps of: voltage monitoring: a monitoring unit monitors a voltage of a cell of the photovoltaic system; starting and stopping control: and if the voltage of the battery is lower than the first voltage, the inverter is shut down.
At night, the photovoltaic system cannot charge the battery, and the voltage of the battery needs to be monitored, because whether the voltage value of the battery is normal or not is an important basis for judging whether the current electric equipment can be normally powered or not. When the voltage drops below the first voltage, the current battery runs out of electric quantity and cannot supply power to the electric equipment continuously, the inverter needs to be turned off in time, the inverter is prevented from converting the electric quantity of the battery continuously so as to prevent the electric quantity of the battery from being exhausted, and the service life of the battery is prolonged.
2. According to the method for controlling the automatic start and stop of the photovoltaic system inverter, in the step of start and stop control, the inverter is synchronously connected to the bypass power supply to supply power to the load when being closed.
The uninterrupted power supply to the electric equipment is maintained, and the work interruption caused by power loss of the electric equipment is prevented.
3. The photovoltaic system inverter automatic start-stop control circuit comprises a battery, the control circuit comprises a voltage monitoring unit and a start-stop control unit voltage monitoring unit, the voltage monitoring unit is connected with the battery to monitor the voltage of the battery, the start-stop control unit is connected with the inverter to switch the inverter, when the voltage of the battery is lower than a first voltage, the voltage monitoring unit sends a first signal to the start-stop control unit, and the start-stop control unit receives the first signal and then controls the inverter to be closed.
4. According to the automatic start-stop control circuit of the photovoltaic system inverter in the technical scheme 3, the start-stop control unit is coupled with the starting switch dry contact of the inverter through the contactor.
The contactor realizes the switching function under the action of the magnetic field, and the overall safety of the system can be improved in a contactor coupling connection mode.
5. According to the technical scheme 4, the photovoltaic system inverter automatic start-stop control circuit is provided with a plurality of inverters.
The power supply to a plurality of groups of electric equipment can be realized by arranging a plurality of inverters.
6. According to the photovoltaic system inverter automatic start-stop control circuit of the technical scheme 3, the starting switch dry contact is a normally closed dry contact or a normally open dry contact.
7. The photovoltaic system inverter automatic start-stop control circuit according to claim 3 further comprises a bypass power supply, an output end of the bypass power supply is connected in parallel with an output end of the inverter, the start-stop control unit is connected with the bypass power supply, and the start-stop control unit controls the inverter to be turned off and synchronously starts the bypass power supply to supply power to a load.
8. According to the photovoltaic system inverter automatic start-stop control circuit of the technical scheme 7, the bypass power supply comprises a diesel generator.
Drawings
Fig. 1 is a schematic diagram of a use state of an automatic start-stop control circuit of a photovoltaic system inverter according to the invention;
reference numerals:
a battery 1; a bypass power supply 2; a voltage monitoring unit 3; a start-stop control unit 4; and an inverter 5.
Detailed Description
The invention is described in detail below with reference to specific embodiments.
As shown in fig. 1, the photovoltaic system includes a battery 1, the control circuit includes a voltage monitoring unit 3 and a start-stop control unit 4, the voltage monitoring unit 3 is connected to the battery 1 to monitor a voltage of the battery 1, the start-stop control unit 4 is connected to the inverter 5 to switch the inverter 5, and when the voltage of the battery 1 is lower than a first voltage, the voltage monitoring unit 3 sends a first signal to the start-stop control unit 4. The start-stop control unit 4 is coupled with a starting switch dry contact of the inverter 5 through a contactor. When the start-stop control unit 4 receives the first signal, the trigger sends a control signal to the normally closed dry contact point NC of the inverter 5 to control the inverter 5 to be closed and synchronously start the bypass power supply 2 to supply power to the load, the bypass power supply 2 is a diesel generator, the inverter 5 is provided with a plurality of inverters, and each inverter 5 is in a default starting state and only after the control signal is input to the normally closed dry contact point NC of the inverter 5, the inverter 5 is closed. In other embodiments, if the inverter 5 is maintained in the closed state by default, and only after a control signal is input to the normally open dry contact of the inverter 5, the inverter 5 is opened, a control signal may be sent to the normally open dry contact of the inverter 5 to maintain the inverter 5 in the open state.
Because the photovoltaic system cannot charge the battery 1 at night, the voltage of the battery 1 needs to be monitored, and whether the voltage of the battery 1 is normal or not is an important basis for judging whether the current electric equipment can be normally powered or not. When the voltage drops below the first voltage, which indicates that the battery 1 is exhausted until the battery 1 has no capacity to continue to supply power to the electric equipment, the inverter 5 needs to be turned off in time, so that the inverter 5 is prevented from converting the electric quantity of the battery 1 to prevent the electric quantity of the battery 1 from being exhausted, and the service life of the battery 1 is prolonged.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (8)

1. The automatic start-stop control method of the photovoltaic system inverter is characterized by comprising the following steps of: voltage monitoring: a monitoring unit monitors a voltage of a cell of the photovoltaic system; starting and stopping control: and if the voltage of the battery is lower than the first voltage, the inverter is shut down.
2. The automatic start-stop control method of the photovoltaic system inverter according to claim 1, wherein in the start-stop control step, the bypass power supply is synchronously connected to supply power to the load when the inverter is turned off.
3. The photovoltaic system inverter automatic start-stop control circuit is characterized in that the control circuit comprises a voltage monitoring unit and a start-stop control unit, the voltage monitoring unit is connected with the battery to monitor the voltage of the battery, the start-stop control unit is connected with the inverter to switch the inverter, when the voltage of the battery is lower than a first voltage, the voltage monitoring unit sends a first signal to the start-stop control unit, and the start-stop control unit receives the first signal and then controls the inverter to be closed.
4. The photovoltaic system inverter automatic start-stop control circuit according to claim 3, wherein the start-stop control unit is coupled with a start switch dry contact of the inverter through a contactor.
5. The photovoltaic system inverter automatic start-stop control circuit according to claim 4, wherein the inverter is provided with a plurality of inverters.
6. The photovoltaic system inverter automatic start-stop control circuit according to claim 3, wherein the starting switch dry contact is a normally closed dry contact or a normally open dry contact.
7. The photovoltaic system inverter automatic start-stop control circuit according to claim 3, further comprising a bypass power supply, wherein an output end of the bypass power supply is connected in parallel with an output end of the inverter, the start-stop control unit is connected with the bypass power supply, and the start-stop control unit controls to synchronously start the bypass power supply to supply power to a load when the inverter is turned off.
8. The photovoltaic system inverter automatic start-stop control circuit of claim 7, wherein the bypass power source comprises a diesel generator.
CN202011641308.6A 2020-12-31 2020-12-31 Automatic start-stop control method and circuit for photovoltaic system inverter Pending CN112803741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011641308.6A CN112803741A (en) 2020-12-31 2020-12-31 Automatic start-stop control method and circuit for photovoltaic system inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011641308.6A CN112803741A (en) 2020-12-31 2020-12-31 Automatic start-stop control method and circuit for photovoltaic system inverter

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860266A (en) * 2010-04-02 2010-10-13 艾默生网络能源有限公司 Photovoltaic inverter power saving control system and method
CN102315764A (en) * 2011-09-16 2012-01-11 深圳创动科技有限公司 Control method for auxiliary power supply of photovoltaic inverter and device
CN103683998A (en) * 2013-12-19 2014-03-26 华为技术有限公司 Method and device for reducing nighttime power consumption of photovoltaic inverter
CN103748759A (en) * 2011-06-27 2014-04-23 太阳能公司 Methods and apparatus for controlling operation of photovoltaic power plants
CN204216665U (en) * 2014-11-25 2015-03-18 广东易事特电源股份有限公司 A kind of high reliability multichannel input uninterrupted power supply
CN105580724A (en) * 2014-11-18 2016-05-18 西安扩力机电科技有限公司 Greenhouse mist culture control system supplied by solar energy
CN206117171U (en) * 2016-09-18 2017-04-19 阳光电源股份有限公司 Static reactive compensation generator of distributing type and intelligent components
CN107134917A (en) * 2016-02-29 2017-09-05 中兴通讯股份有限公司 A kind of inverter control method, device and electricity generation system
CN107834836A (en) * 2017-11-14 2018-03-23 江苏佳讯纳通能源技术有限公司 A kind of photovoltaic DC-to-AC converter starts method
CN208386227U (en) * 2018-05-17 2019-01-15 普尼太阳能(杭州)有限公司 Wind-light storage is provided multiple forms of energy to complement each other system
CN109494801A (en) * 2018-12-25 2019-03-19 航天柏克(广东)科技有限公司 One kind is from Grid-connected photovoltaic inverter system
CN208690992U (en) * 2018-05-18 2019-04-02 四川省有份儿智慧科技有限公司 A kind of energy supplying system for physical space type digital intelligent terminal

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860266A (en) * 2010-04-02 2010-10-13 艾默生网络能源有限公司 Photovoltaic inverter power saving control system and method
CN103748759A (en) * 2011-06-27 2014-04-23 太阳能公司 Methods and apparatus for controlling operation of photovoltaic power plants
CN102315764A (en) * 2011-09-16 2012-01-11 深圳创动科技有限公司 Control method for auxiliary power supply of photovoltaic inverter and device
CN103683998A (en) * 2013-12-19 2014-03-26 华为技术有限公司 Method and device for reducing nighttime power consumption of photovoltaic inverter
CN105580724A (en) * 2014-11-18 2016-05-18 西安扩力机电科技有限公司 Greenhouse mist culture control system supplied by solar energy
CN204216665U (en) * 2014-11-25 2015-03-18 广东易事特电源股份有限公司 A kind of high reliability multichannel input uninterrupted power supply
CN107134917A (en) * 2016-02-29 2017-09-05 中兴通讯股份有限公司 A kind of inverter control method, device and electricity generation system
CN206117171U (en) * 2016-09-18 2017-04-19 阳光电源股份有限公司 Static reactive compensation generator of distributing type and intelligent components
CN107834836A (en) * 2017-11-14 2018-03-23 江苏佳讯纳通能源技术有限公司 A kind of photovoltaic DC-to-AC converter starts method
CN208386227U (en) * 2018-05-17 2019-01-15 普尼太阳能(杭州)有限公司 Wind-light storage is provided multiple forms of energy to complement each other system
CN208690992U (en) * 2018-05-18 2019-04-02 四川省有份儿智慧科技有限公司 A kind of energy supplying system for physical space type digital intelligent terminal
CN109494801A (en) * 2018-12-25 2019-03-19 航天柏克(广东)科技有限公司 One kind is from Grid-connected photovoltaic inverter system

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Application publication date: 20210514

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