CN108964100B - Photovoltaic circuit control method and device based on circuit current - Google Patents
Photovoltaic circuit control method and device based on circuit currentDownload PDFInfo
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- CN108964100B CN108964100BCN201810669640.XACN201810669640ACN108964100BCN 108964100 BCN108964100 BCN 108964100BCN 201810669640 ACN201810669640 ACN 201810669640ACN 108964100 BCN108964100 BCN 108964100B
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- 238000007599dischargingMethods0.000claimsdescription14
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- 238000010248power generationMethods0.000abstractdescription7
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/383—
- 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
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
Technical Field
The invention relates to the field of photovoltaic circuit control, in particular to a photovoltaic circuit control method and device based on circuit current.
Background
At present, with the development of photovoltaic technology, the application of photovoltaic power generation is more and more extensive. In the photovoltaic circuit system, electric energy is provided by a power grid and a photovoltaic panel together, and because the photovoltaic panel can only generate electricity in the daytime, if the consumption of the load to the electric energy is insufficient at the moment, the electric energy generated by the photovoltaic panel is excessive. In the prior art, the method generally adopted is to monitor the power or voltage supplied by the load and the photovoltaic panel and send the surplus electric energy to the power grid when the electric energy generated by the photovoltaic panel is surplus. Although the method can realize the shunt control of the residual electric energy generated by the photovoltaic panel during working, the residual electric energy generated by the photovoltaic panel is wasted, and the photovoltaic power generation utilization rate is low. Therefore, a method for storing the surplus electric energy when the surplus electric energy is judged is needed.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a photovoltaic circuit control method and apparatus based on circuit current, which can effectively solve the problem of excessive electric energy in the circuit and can improve the utilization rate of electric energy in practical applications.
The technical scheme adopted by the invention for solving the problems is as follows:
a photovoltaic circuit control method based on circuit current comprises the following steps:
a, obtaining numerical values of current total load current, power grid current and photovoltaic panel current;
b, if the current value of the photovoltaic panel obtained in the step A is not 0, executing the step C, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
step C, if the sum of the grid current value and the absolute value of the photovoltaic panel current value is larger than the absolute value of the total load current value, executing step D, and if the sum is equal to the absolute value of the total load current value, executing step A;
and D, setting the storage battery to be in a charging state, and executing the step A.
Further, in the step C, if the sum of the grid current and the absolute value of the current value of the photovoltaic panel is greater than the absolute value of the total load current value, the sum of the grid current value and the absolute value of the current value of the photovoltaic panel is subtracted by the absolute value of the total load current to obtain the charging current of the storage battery, and then the step D is executed.
Further, the storage battery also comprises an LED indicator light, and the step D comprises the following steps after the storage battery is set to be in a charging state:
d1, detecting whether the storage battery is fully charged, if so, stopping charging and controlling the LED indicator light to be red, and if not, continuously charging and controlling the LED indicator light to be blue;
and D2, sending the storage battery information to a display screen for display.
Further, step D2 is that the battery information includes a charging status and a current charge, the battery operating status includes charging, full charging and discharging, and the current charge is displayed in percentage.
A circuit current based photovoltaic circuit control apparatus, comprising:
the current acquisition device: the method comprises the steps of obtaining values of total load current, power grid current and photovoltaic panel current;
photovoltaic board current detection device: if the current value of the photovoltaic panel obtained by the current obtaining device is not 0, starting the current comparing device, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
a current comparison device: if the sum of the current value of the power grid and the absolute value of the current value of the photovoltaic panel is larger than the absolute value of the total load current value, starting the storage battery control device, and if the sum is equal to the absolute value of the total load current value, starting the current acquisition device;
a battery control device: for setting the accumulator to a charged or discharged state.
Further, the device also comprises the following devices:
storage battery charging current calculation means: the current magnitude used for charging the storage battery is calculated;
battery power detection device: the system is used for detecting the real-time electric quantity condition of the storage battery;
LED warning light controlling means: controlling the LEDs to light different colors according to the charging condition when the storage battery is charged;
storage battery information display apparatus: and the display screen is used for displaying the acquired storage battery information.
A photovoltaic circuit control device based on circuit current comprises a control module and a storage module for storing control instructions, wherein the control module reads the instructions to execute the following steps:
a, obtaining numerical values of current total load current, power grid current and photovoltaic panel current;
b, if the current value of the photovoltaic panel obtained in the step A is not 0, executing the step C, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
step C, if the sum of the grid current value and the absolute value of the photovoltaic panel current value is larger than the absolute value of the total load current value, executing step D, and if the sum is equal to the absolute value of the total load current value, executing step A;
and D, setting the storage battery to be in a charging state, and executing the step A.
Further, in the step C, if the sum of the grid current and the absolute value of the current value of the photovoltaic panel is greater than the absolute value of the total load current value, the sum of the grid current value and the absolute value of the current value of the photovoltaic panel is subtracted by the absolute value of the total load current to obtain the charging current of the storage battery, and then the step D is executed.
Further, the storage battery also comprises an LED indicator light, and the step D comprises the following steps after the storage battery is set to be in a charging state:
d1, detecting whether the storage battery is fully charged, if so, stopping charging and controlling the LED indicator light to be red, and if not, continuously charging and controlling the LED indicator light to be blue;
and D2, sending the storage battery information to a display screen for display.
Further, step D2 is that the battery information includes a charging status and a current charge, the battery operating status includes charging, full charging and discharging, and the current charge is displayed in percentage.
The invention has the beneficial effects that: the invention adopts a photovoltaic circuit control method and a photovoltaic circuit control device based on circuit current, which utilize the total load current, the power grid current and the photovoltaic panel current in the photovoltaic circuit to judge whether the electric energy in the circuit is surplus, and introduce a storage battery to store the surplus electric energy. Compared with the method of transmitting the surplus electric energy into the power grid in the prior art, the method of the invention effectively stores the electric energy generated in the power generation process of the photovoltaic panel into the storage battery, and transmits the stored electric energy to the load for utilization when the photovoltaic panel stops power generation, thereby improving the self-utilization rate of photovoltaic power generation, avoiding the waste of resources and achieving the maximization of economic benefit.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a logic diagram of a circuit current based photovoltaic circuit control method of the present invention;
FIG. 2 is a logic diagram of the starting charging of a storage battery in the photovoltaic circuit control method based on the circuit current.
Detailed Description
Referring to fig. 1, the photovoltaic circuit control method based on circuit current of the present invention includes the following steps:
a, obtaining numerical values of current total load current, power grid current and photovoltaic panel current;
b, if the current value of the photovoltaic panel obtained in the step A is not 0, executing the step C, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
step C, if the sum of the grid current value and the absolute value of the photovoltaic panel current value is larger than the absolute value of the total load current value, executing step D, and if the sum is equal to the absolute value of the total load current value, executing step A;
and D, setting the storage battery to be in a charging state, and executing the step A.
In the step a, each current value is obtained by using the alternating current detection transformer arranged in the circuit, compared with the defects of complex equipment, large error, high failure rate and high maintenance cost in the prior art for measuring voltage and power, the equipment provided by the invention has the advantages of simple arrangement, high accuracy and low failure rate, and the current value of each corresponding position can be quickly and accurately obtained.
When the current of the photovoltaic panel is not 0 in the step B, it indicates that the photovoltaic panel is generating, and when the current of the photovoltaic panel is correspondingly 0, it indicates that the photovoltaic panel is not generating. Due to the dependence of the photovoltaic panel on sunlight, the photovoltaic panel cannot work when no sunlight exists, and at the moment, the electric energy stored in the storage battery is the residual electric energy generated when the photovoltaic panel works, so that the utilization rate of the photovoltaic panel is improved.
The design of the current circuit is generally rationalized at present, and the condition that the current required by the load is larger than the current supplied by the power grid and the photovoltaic panel does not exist, so that the condition that the sum of the absolute values of the current values of the power grid and the photovoltaic panel and the absolute value of the total load current value in the step C are only larger than or equal to each other, if the sum is larger than the absolute value, the power generation amount is excessive, the step D needs to be executed, the excessive electric energy is reduced and stored in a storage battery, if the sum is equal to the absolute value, the full-load operation is indicated, the excessive electric energy does not exist, the step D does not need to be executed, the step A is repeatedly executed, and the response can be timely realized when the total load current changes.
Further, in the step C, if the sum of the grid current and the absolute value of the current value of the photovoltaic panel is greater than the absolute value of the total load current value, the sum of the grid current value and the absolute value of the current value of the photovoltaic panel is subtracted by the absolute value of the total load current to obtain the charging current of the storage battery, and then the step D is executed.
Referring to fig. 2, further, the storage battery further includes an LED indicator, and after the storage battery is set to the charging state in step D, the method further includes the following steps:
d1, detecting whether the storage battery is fully charged, if so, stopping charging and controlling the LED indicator light to be red, and if not, continuously charging and controlling the LED indicator light to be blue;
and D2, sending the storage battery information to a display screen for display.
The LED lamp is turned on red to indicate that the storage battery is fully charged, the LED lamp is turned on blue to indicate that the storage battery is being charged, the acquired storage battery information is sent to the display screen to be displayed, and the working state of the storage battery can be visually observed.
Wherein, the calculation formula of the electric quantity of the storage battery by combining the charging current obtained in the step C1 is
Wherein t is0The charging start time, t the charging end time, and U the battery voltage.
The content displayed by the display screen in the step D2 further includes the total load current value, the photovoltaic panel current value and the grid current value acquired in the step a.
Wherein, the battery passes through double-circuit interlocking relay and circuit connection, and when the charge-discharge state of battery changed, original closed the same way just can break off, has avoided the battery to charge and discharge at the same time.
Further, step D2 is that the battery information includes a charging status and a current charge, the battery operating status includes charging, full charging and discharging, and the current charge is displayed in percentage.
A circuit current based photovoltaic circuit control apparatus, comprising:
the current acquisition device: the method comprises the steps of obtaining values of total load current, power grid current and photovoltaic panel current;
photovoltaic board current detection device: if the current value of the photovoltaic panel obtained by the current obtaining device is not 0, starting the current comparing device, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
a current comparison device: if the sum of the current value of the power grid and the absolute value of the current value of the photovoltaic panel is larger than the absolute value of the total load current value, starting the storage battery control device, and if the sum is equal to the absolute value of the total load current value, starting the current acquisition device;
a battery control device: for setting the accumulator to a charged or discharged state.
Further, the device also comprises the following devices:
storage battery charging current calculation means: the current magnitude used for charging the storage battery is calculated;
battery power detection device: the system is used for detecting the real-time electric quantity condition of the storage battery;
LED warning light controlling means: controlling the LEDs to light different colors according to the charging condition when the storage battery is charged;
storage battery information display apparatus: and the display screen is used for displaying the acquired storage battery information.
A photovoltaic circuit control device based on circuit current comprises a control module and a storage module for storing control instructions, wherein the control module reads the instructions to execute the following steps:
a, obtaining numerical values of current total load current, power grid current and photovoltaic panel current;
b, if the current value of the photovoltaic panel obtained in the step A is not 0, executing the step C, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
step C, if the sum of the grid current value and the absolute value of the photovoltaic panel current value is larger than the absolute value of the total load current value, executing step D, and if the sum is equal to the absolute value of the total load current value, executing step A;
and D, setting the storage battery to be in a charging state, and executing the step A.
Further, in the step C, if the sum of the grid current and the absolute value of the current value of the photovoltaic panel is greater than the absolute value of the total load current value, the sum of the grid current value and the absolute value of the current value of the photovoltaic panel is subtracted by the absolute value of the total load current to obtain the charging current of the storage battery, and then the step D is executed.
Further, the storage battery also comprises an LED indicator light, and the step D comprises the following steps after the storage battery is set to be in a charging state:
d1, detecting whether the storage battery is fully charged, if so, stopping charging and controlling the LED indicator light to be red, and if not, continuously charging and controlling the LED indicator light to be blue;
and D2, sending the storage battery information to a display screen for display.
Further, step D2 is that the battery information includes a charging status and a current charge, the battery operating status includes charging, full charging and discharging, and the current charge is displayed in percentage.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means.
Claims (10)
1. A photovoltaic circuit control method based on circuit current is characterized by comprising the following steps:
a, obtaining numerical values of current total load current, power grid current and photovoltaic panel current;
b, if the current value of the photovoltaic panel obtained in the step A is not 0, executing the step C, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
step C, if the sum of the grid current value and the absolute value of the photovoltaic panel current value is larger than the absolute value of the total load current value, executing step D, and if the sum is equal to the absolute value of the total load current value, executing step A;
and D, setting the storage battery to be in a charging state, and executing the step A.
2. The circuit current-based photovoltaic circuit control method according to claim 1, wherein: in the step C, if the sum of the grid current and the absolute value of the current value of the photovoltaic panel is larger than the absolute value of the total load current value, the sum of the grid current value and the absolute value of the current value of the photovoltaic panel is subtracted by the absolute value of the total load current to obtain the charging current of the storage battery, and then the step D is executed.
3. The circuit current-based photovoltaic circuit control method according to claim 2, wherein: the storage battery also comprises an LED indicator light, and the storage battery set to be in a charging state in the step D further comprises the following steps:
d1, detecting whether the storage battery is fully charged, if so, stopping charging and controlling the LED indicator light to be red, and if not, continuously charging and controlling the LED indicator light to be blue;
and D2, sending the storage battery information to a display screen for display.
4. The circuit current-based photovoltaic circuit control method of claim 3, wherein: step D2 is a step of displaying the battery information including the operating status of the battery including charging, full charge, and discharging, and the current charge amount in percentage.
5. A photovoltaic circuit control device based on circuit current is characterized by comprising the following devices:
the current acquisition device: the method comprises the steps of obtaining values of total load current, power grid current and photovoltaic panel current;
photovoltaic board current detection device: if the current value of the photovoltaic panel obtained by the current obtaining device is not 0, starting the current comparing device, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
a current comparison device: if the sum of the current value of the power grid and the absolute value of the current value of the photovoltaic panel is larger than the absolute value of the total load current value, starting the storage battery control device, and if the sum is equal to the absolute value of the total load current value, starting the current acquisition device;
a battery control device: for setting the accumulator to a charged or discharged state.
6. The circuit current based photovoltaic circuit control apparatus of claim 5, further comprising:
storage battery charging current calculation means: the current magnitude used for charging the storage battery is calculated;
battery power detection device: the system is used for detecting the real-time electric quantity condition of the storage battery;
LED warning light controlling means: controlling the LEDs to light different colors according to the charging condition when the storage battery is charged;
storage battery information display apparatus: and the display screen is used for displaying the acquired storage battery information.
7. A photovoltaic circuit control device based on circuit current is characterized by comprising a control module and a storage module for storing control instructions, wherein the control module reads the instructions to execute the following steps:
a, obtaining numerical values of current total load current, power grid current and photovoltaic panel current;
b, if the current value of the photovoltaic panel obtained in the step A is not 0, executing the step C, and if the current value of the photovoltaic panel is 0, setting the storage battery in a discharging state;
step C, if the sum of the grid current value and the absolute value of the photovoltaic panel current value is larger than the absolute value of the total load current value, executing step D, and if the sum is equal to the absolute value of the total load current value, executing step A;
and D, setting the storage battery to be in a charging state, and executing the step A.
8. The circuit current based photovoltaic circuit control apparatus of claim 7, wherein: in the step C, if the sum of the grid current and the absolute value of the current value of the photovoltaic panel is larger than the absolute value of the total load current value, the sum of the grid current value and the absolute value of the current value of the photovoltaic panel is subtracted by the absolute value of the total load current to obtain the charging current of the storage battery, and then the step D is executed.
9. The circuit current based photovoltaic circuit control apparatus of claim 8, wherein: the storage battery also comprises an LED indicator light, and the step D comprises the following steps after the storage battery is set to be in a charging state:
d1, detecting whether the storage battery is fully charged, if so, stopping charging and controlling the LED indicator light to be red, and if not, continuously charging and controlling the LED indicator light to be blue;
and D2, sending the storage battery information to a display screen for display.
10. The circuit current based photovoltaic circuit control apparatus of claim 9, wherein: step D2 is a step of displaying the battery information including a state of charge and a current amount of charge, the operating state of the battery including being charged, being fully charged, and being discharged, and the current amount of charge in percentage.
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| JP2010259303A (en)* | 2009-04-28 | 2010-11-11 | Panasonic Corp | Distributed power generation system |
| JP5672087B2 (en)* | 2010-04-02 | 2015-02-18 | オムロン株式会社 | Control apparatus and control method |
| CN101951011B (en)* | 2010-08-25 | 2013-01-23 | 南京航空航天大学 | Solar photovoltaic and commercial power combined power supply system and control method thereof |
| CN102983617B (en)* | 2011-09-05 | 2016-01-20 | 台达电子工业股份有限公司 | Solar photovoltaic power generation system with adaptive power control and method of operation thereof |
| CN102412598B (en)* | 2011-12-12 | 2014-01-22 | 辽宁省电力有限公司锦州供电公司 | Minitype intelligent bidirectional self-adaptation grid-connected photovoltaic power generation system and control method thereof |
| CN103441566B (en)* | 2013-09-12 | 2016-07-06 | 重庆大学 | The collaborative electric power system of a kind of civil power, photovoltaic cell and energy-storage battery and method |
| CN203670100U (en)* | 2013-10-23 | 2014-06-25 | 国家电网公司 | Household wind and photovoltaic complementary power generation system suitable for island micro power grid power supply mode |
| CN103840486B (en)* | 2014-03-07 | 2015-12-30 | 广东志成冠军集团有限公司 | A kind of control method of photovoltaic power supply system grid connection of accumulation energy type |
| CN104682438A (en)* | 2015-03-19 | 2015-06-03 | 成都鼎智汇科技有限公司 | Monitoring device for grid-connected operation photovoltaic power generation system |
| CN104795832B (en)* | 2015-04-24 | 2017-10-31 | 深圳市盛弘电气股份有限公司 | Photovoltaic electric energy management method and system and electric energy distribution control device |
| US10424933B2 (en)* | 2016-08-10 | 2019-09-24 | Tesla, Inc. | Automatic smart transfer switch for energy generation systems |
| US11050260B2 (en)* | 2016-08-17 | 2021-06-29 | Tesla, Inc. | Smart main electrical panel for energy generation systems |
| CN206820477U (en)* | 2017-06-09 | 2017-12-29 | 中塔新兴通讯技术集团有限公司 | A kind of system of synthesis energy saving power supply |
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