CN209843885U - Photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission - Google Patents

Photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission Download PDF

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Publication number
CN209843885U
CN209843885U CN201920867998.3U CN201920867998U CN209843885U CN 209843885 U CN209843885 U CN 209843885U CN 201920867998 U CN201920867998 U CN 201920867998U CN 209843885 U CN209843885 U CN 209843885U
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China
Prior art keywords
circuit
radio frequency
data transmission
charging
discharging
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Expired - Fee Related
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CN201920867998.3U
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Chinese (zh)
Inventor
程红丽
王博祥
田伟明
赵月川
贾龙飞
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Xian University of Science and Technology
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Xian University of Science and Technology
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Priority to CN201920867998.3U priority Critical patent/CN209843885U/en
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    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model discloses a photovoltaic lithium cell charge-discharge management and monitored control system based on radio frequency wireless transmission, including photovoltaic board, MPPT control energy-taking circuit, ARM board charging and discharging circuit, load interface, lithium cell group commonly used and reserve lithium cell group, the wireless data transmission circuit of radio frequency, host computer end. The system hardware circuit can realize the input of the maximum solar power, supply the electric quantity to the lithium battery pack, supply the electric quantity to an external load at night, and directly supply the electric quantity to the external load when the electric quantity is sufficient; the radio frequency circuit can transmit relevant data to the PC end of the upper computer through a serial port through an MODBUS protocol and monitor and manage the data. The system control strategy analyzes and processes the data transmitted by the radio frequency wireless communication and then monitors and manages the data, so that the charging and discharging systems of a large number of photovoltaic lithium batteries can be managed, the problems that the electric quantity of the lithium batteries is over-charged and over-discharged, the charging and discharging of the lithium batteries are effectively switched and the like can be accurately and efficiently managed in real time, and the service efficiency of the lithium batteries is improved.

Description

Photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission
Technical Field
The utility model relates to a photovoltaic lithium cell charge-discharge management field, concretely relates to photovoltaic lithium cell charge-discharge management and monitored control system based on radio frequency wireless transmission.
Background
The photovoltaic power generation has the characteristics of no pollution, no noise, inexhaustibility and convenient energy acquisition, is a green energy source with wide prospect, and will occupy an important position in a future power supply system. In rare areas such as wasteland, gobi and the like, electric energy can be supplied to electric equipment only by natural energy. Because the limit of natural condition and physical property is at night or under some circumstances, photovoltaic cell can't directly supply power, consequently need with solar energy high efficiency, quick storage in energy storage equipment when photovoltaic board can work, just release the electric energy for the consumer when the for-use electrical equipment needs the power supply, supply the consumer to use.
The existing wireless data transmission has many applications, such as GPRS technology, and most of the technologies transmit by means of internet technology. The radio frequency adopts an ISM frequency band, and long-distance, real-time and accurate transmission can be performed under appropriate conditions such as antenna height and the like without the help of an internet technology.
The wireless radio frequency communication is adopted, so that a worker can master the working state of the power supply system at the upper computer end, the photovoltaic panel works at the maximum power output state or not, the output voltage of the MPPT circuit or not, which group of batteries are charged or discharged, the residual electric quantity and the charging and discharging times of each group of batteries and the state information such as the total residual electric quantity can be timely adjusted according to the state information, and the efficient use efficiency of the lithium battery and the normal operation of partial circuits of the system are guaranteed.
At present, most photovoltaic lithium battery charging and discharging management systems adopt a field wiring mode, the number of managed systems is limited, and the systems cannot be monitored and managed timely and efficiently. Most photovoltaic lithium battery charging and discharging management systems do not fully utilize solar energy, and reasonable switching between load power supply and lithium battery power supply is realized. The radio frequency data transmission technology can accurately, efficiently and real-timely transmit data. The upper computer terminal can reasonably and efficiently process the transmitted data, and the efficient operation of the lithium battery and partial circuits is ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a photovoltaic lithium cell charge-discharge management and monitored control system based on radio frequency wireless transmission, this system realizes multiunit lithium cell charge-discharge management through low-power consumption radio frequency data transmission technique, has strengthened the security of system's power supply effectively to realize human-computer interaction through radio frequency wireless network, realized the facility of system detection and the optimization of mode.
The technical scheme for realizing the purpose is as follows: a photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission is characterized by comprising a photovoltaic panel, an MPPT control energy taking circuit, an ARM panel charging and discharging circuit, a load interface, a common lithium battery pack, a standby lithium battery pack, a radio frequency wireless data transmission circuit and an upper computer end;
the output of the photovoltaic panel is connected to the MPPT energy-taking circuit to directly supply power to the MPPT energy-taking circuit, and the MPPT energy-taking circuit is connected with the ARM panel charging and discharging circuit;
the ARM board charging and discharging circuit consists of a switch driving circuit, an ARM controller and a sampling filtering impedance matching circuit; the ARM controller samples the voltage of relevant nodes in real time through sampling filtering and impedance matching circuit, switch-on and closing of relevant switch are realized through the switching signal of the relevant node of switch drive circuit output, the ARM controller passes through the serial ports and is connected with the wireless data transmission circuit of radio frequency, the wireless data transmission circuit of radio frequency communicates with the host computer end through wireless transmission, the wireless data transmission circuit of radio frequency can be with relevant data through MODBUS agreement, transmit to the host computer end through the serial ports and carry out corresponding control and management to data.
A photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission is characterized in that an ARM end serial port data transmission mode is adopted, ARM end serial port data output is connected with a radio frequency wireless data transmission circuit to carry out data transmission communication, and at an upper computer end, a TTL-to-USB circuit is connected with the radio frequency wireless data transmission circuit to carry out data transmission communication.
A photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission is characterized in that voltages of relevant nodes refer to a solar panel output end voltage, an MPPT energy-taking circuit output voltage and a lithium battery end voltage.
A photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission is characterized in that an ARM controller automatically tests virtual boosting during charging and virtual voltage reduction during discharging of all lithium batteries.
A photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission is characterized in that an MPPT energy obtaining circuit automatically switches between voltage boosting and voltage reducing.
The system hardware circuit can realize the input of the maximum solar power, supply the electric quantity to the lithium battery pack, supply the electric quantity to an external load at night, and directly supply the electric quantity to the external load when the electric quantity is sufficient; the common lithium battery pack supplies external loads, and the standby lithium battery pack ensures the normal operation of the ARM board control system and also supplies dormant load electric quantity; performing charge and discharge management on the lithium battery according to the charge and discharge times and the priority of the common lithium battery and the standby lithium battery; the radio frequency circuit can transmit data such as lithium battery electric quantity, charging and discharging times, voltage, photovoltaic panel voltage and MPPT circuit voltage to the PC end of the upper computer through a serial port through an MODBUS protocol, and the data are monitored and managed.
The control strategy of the system is as follows:
1) through the wireless data transmission circuit of radio frequency, with data transmission to host computer end, data include: the photovoltaic panel output voltage, the MPPT circuit output voltage, the battery voltage, the current, the charging and discharging times, the date, the working state and the enable bit state information;
2) the output normal voltage of the photovoltaic panel is 17.5V or slightly lower, and the output normal voltage of the MPPT circuit is 28V or slightly lower. When the data monitored by the upper computer end has great deviation with the actual data, the photovoltaic panel and the MPPT circuit can be judged to be abnormal and need to be maintained; when the data monitored by the upper computer end is normal, continuing to monitor and manage;
3) the battery voltage range (3-12) V, the maximum charging current 10A, the maximum discharging current 5A, and the number of charging and discharging operations are determined in actual circumstances. When the upper computer terminal monitors that the battery voltage is lower than 3V or the difference between the battery charging and discharging times and other battery packs is larger, the battery can be judged to have problems and needs to be maintained; when the data monitored by the upper computer end is normal, continuing to monitor and manage;
4) due to the fact that solar charging is limited in time, reasonable working time and date need to be set for system operation. When the date, the time and the reality monitored by the upper computer end are different, the date and the time need to be reset; when the date and time monitored by the upper computer end are normal, monitoring management is continued;
5) the battery is in an on-line state and an off-line state, the circuit is in a normal and abnormal state, and the enabling bit states comprise a 24-hour normally-open enabling bit and a 24-hour normally-closed enabling bit. When the upper computer end monitors that the working state and the enabling bit state are inconsistent with other data, the upper computer end judges that a problem occurs and needs to be maintained; and when the upper computer end monitors that the working state and the enabling bit state are consistent with other data, continuing monitoring and managing.
At present, a photovoltaic lithium battery system cannot effectively monitor and manage a lithium battery and a system circuit in real time. The utility model has the advantages that: (1) the radio frequency wireless data transmission technology is adopted, so that data can be transmitted timely, accurately and efficiently to control the performance of the lithium battery, the service life balance of each group of batteries is improved, and the service cycle of the system is prolonged; (2) the monitoring and management of the system ensure whether partial circuits normally operate. (3) Through the monitoring and management of the system, whether the MPPT circuit and the photovoltaic panel of the system normally operate or not is ensured, the automatic test of virtual voltage and the switching problem of the battery during the charging and discharging of the battery are realized, and the efficiency of the high-efficiency operation of the lithium battery is improved.
Drawings
Fig. 1-1 is a circuit block diagram of the whole system of the present invention.
Fig. 1-2 are the circuit schematic diagram of the whole system of the present invention.
FIG. 2-1 is a pin layout diagram of a radio frequency (FC-RF209S) wireless data transfer circuit.
Fig. 2-2 is a flow chart of the management of a radio frequency (FC-RF209S) wireless data transfer circuit.
Fig. 3-1 is data one monitored and managed by the upper computer side.
Fig. 3-2 shows a second data monitored and managed by the upper computer.
Fig. 3-3 shows data three monitored and managed by the upper computer.
Detailed Description
The invention will be further explained with reference to the drawings and examples.
As shown in fig. 1-1, the utility model discloses photovoltaic lithium cell charge-discharge management and monitored control system based on radio frequency wireless transmission comprises photovoltaic board, MPPT control energy-taking circuit, ARM board charge-discharge circuit, load interface, lithium cell group, the wireless data transmission circuit of radio frequency, host computer end.
The MPPT control energy taking circuit is directly powered by the photovoltaic panel, maximum power tracking is realized under the self-starting condition, all lithium battery packs needing to be charged are charged, and the charging time is shortened.
The ARM board charging and discharging circuit is powered by the standby battery pack (has charging priority), normal power supply of a control system can be guaranteed, virtual boosting during charging and virtual voltage reduction during discharging of any battery pack can be automatically tested, and accuracy of system control during charging and discharging of the battery pack is improved.
As shown in fig. 1-2, the ARM board charging and discharging circuit is composed of a switch driving circuit, an ARM controller, and a sampling filtering impedance matching circuit. ARM board charge-discharge circuit can be with photovoltaic board output voltage, MPPT circuit output voltage, battery voltage, electric current, the number of times of charging and discharging, date, operating condition, enable bit state information, transmits with the MODBUS agreement after the sampling process, ensures lithium cell charge-discharge normal operating.
The load interface is divided into a normal working interface and a load dormancy interface, if the whole electric quantity of the normal power supply battery pack is insufficient or the command of the upper computer is required, the standby battery pack can be connected to the load dormancy interface so as to maintain the system to enter a dormancy operation state, and therefore efficient operation of the system is guaranteed.
During normal power supply, the photovoltaic panel charges and supplies power to the lithium battery or to the load port through the ARM board, and ARM board charge and discharge circuit carries out data transmission through the serial ports with photovoltaic panel output voltage, MPPT circuit output voltage, battery voltage, electric current, the number of charge and discharge, date, operating condition, enable bit state information etc. after the ARM controller is processed the sampling, and the long-range wireless data transmission through radio frequency (FC-RF209S) wireless data transmission circuit is monitored and is managed to the host computer end. The pin assignment diagram for the radio frequency (FC-RF209S) wireless data transfer circuit is shown in FIG. 2-1.
The utility model discloses ARM end cluster data transmission adopts the TTL mode, and ARM end cluster data output connects pin 1, 3, 4, 5, 6 of radio frequency (FC-RF209S) wireless data transmission circuit, carries out normal data transmission communication. At the upper computer end, the TTL-to-USB circuit is connected with pins 1, 3, 4, 5 and 6 of a radio frequency (FC-RF209S) wireless data transmission circuit to carry out normal data transmission communication. The normal operation of both sides ensures that data information is transmitted remotely, accurately and unmistakably and efficiently.
The radio frequency wireless data transmission circuit transmits data transmitted by the serial port to the upper computer end and carries out corresponding monitoring and processing. The monitored and managed data comprise current, voltage and on-line state data of the lithium battery pack and a single lithium battery, the accuracy of the numerical value and the state of the charging and discharging times data are normal, the voltage of the MPPT circuit is normal, the output voltage of the photovoltaic panel is normal, the date, the rationality of the output starting/ending time of the battery pack when the battery pack is turned off and the rationality and the accuracy of the state of the 24-hour normally-open enable bit. The monitoring and management effectively solve the problems of the virtual voltage of the lithium battery and the charge-discharge switching of the lithium battery, and ensure the normal operation of the circuit.
As shown in fig. 2-2, the management process of the radio frequency (FC-RF209S) wireless data transmission circuit is as follows: firstly, testing radio station signals, wherein the content of the test comprises the frequency band of radio frequency communication, the baud rate of data transmission and the setting of data transmission digit. If the station signal cannot be tested, data transmission cannot be performed. After the radio signal test is completed, according to serial port information of MODBUS protocol data transmission, serial port information of TTL signal data transmission and baud rate, transmission digit, stop bit and check bit information of data transmission of the radio signal test in the ARM board, serial port information configured at the upper computer end is consistent with serial port information of the MODBUS protocol data transmission and serial port information of the TTL signal data transmission, the baud rate, transmission digit, stop bit and check bit information of the data transmission and the radio signal test are kept consistent, and data communication is carried out.
As shown in fig. 3-1, 3-2 and 3-3, the upper computer end obtains data such as battery voltage, circuit, battery state and date through the radio frequency wireless data transmission circuit. The date and the internal resistance of the battery have constancy due to the numerical values, frequent change is not needed, and the monitoring and managing part can carry out remote writing processing according to the real-time monitoring condition of the system, thereby meeting the normal requirements of the system. Monitoring and management of data such as the electric quantity and the battery state of the lithium battery can form a sub-database according to the data monitored by the system, then a corresponding judgment threshold value is set, processing and analysis are carried out on the data of the sub-data, and finally whether all parts operate normally or not is displayed on a monitoring management interface. For example, after monitoring and management of the electric quantity of the lithium battery, after the ARM controller performs sampling processing, the normal electric quantity of the battery has a reasonable value range, if the normal electric quantity of the battery is not in the reasonable value range, the monitoring and management part displays abnormity, and abnormal data can be checked, so that corresponding management measures are taken; if the current time is within a reasonable range, the situation is normal, and monitoring and management are continued.
The upper computer end can manage 255 photovoltaic lithium battery charging and discharging systems, and the system time synchronization can be realized through radio frequency wireless, so that the flexibility of the system is improved.
The utility model discloses a three kinds of control and management parts, (1) the setting of lithium cell charge and discharge number of times, (2) the opening and the closing of the enabling mode are normally opened in 24 hours, (3) the setting of time.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims (5)

1. A photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission is characterized by comprising a photovoltaic panel, an MPPT control energy-taking circuit, an ARM panel charging and discharging circuit, a load interface, a common lithium battery pack, a standby lithium battery pack, a radio frequency wireless data transmission circuit and an upper computer terminal,
the output of the photovoltaic panel is connected to the MPPT energy-taking circuit to directly supply power to the MPPT energy-taking circuit, and the MPPT energy-taking circuit is connected with the ARM panel charging and discharging circuit;
the ARM board charging and discharging circuit consists of a switch driving circuit, an ARM controller and a sampling filtering impedance matching circuit; the ARM controller samples the voltage of relevant nodes in real time through sampling filtering and impedance matching circuit, switch-on and closing of relevant switch are realized through the switching signal of the relevant node of switch drive circuit output, the ARM controller passes through the serial ports and is connected with the wireless data transmission circuit of radio frequency, the wireless data transmission circuit of radio frequency communicates with the host computer end through wireless transmission, the wireless data transmission circuit of radio frequency can be with relevant data through MODBUS agreement, transmit to the host computer end through the serial ports and carry out corresponding control and management to data.
2. The system as claimed in claim 1, wherein the ARM-side serial port data transmission is in a TTL mode, the ARM-side serial port data output is connected to the rf wireless data transmission circuit for data transmission and communication, and the TTL-to-USB circuit is connected to the rf wireless data transmission circuit for data transmission and communication at the upper computer.
3. The system as claimed in claim 1, wherein the voltage of the node is selected from the group consisting of solar panel output voltage, MPPT power supply circuit output voltage, and voltage of each lithium battery.
4. The system as claimed in claim 1, wherein the ARM controller automatically tests the virtual boost voltage during charging and the virtual buck voltage during discharging of all lithium batteries.
5. The system as claimed in claim 1, wherein the MPPT power harvesting circuit automatically switches between a boost mode and a buck mode.
CN201920867998.3U 2019-06-11 2019-06-11 Photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission Expired - Fee Related CN209843885U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920867998.3U CN209843885U (en) 2019-06-11 2019-06-11 Photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920867998.3U CN209843885U (en) 2019-06-11 2019-06-11 Photovoltaic lithium battery charging and discharging management and monitoring system based on radio frequency wireless transmission

Publications (1)

Publication Number Publication Date
CN209843885U true CN209843885U (en) 2019-12-24

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20191224

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