Intelligent adjustment control method for photovoltaic module of battery swap station

Abstract

The invention discloses an intelligent adjustment control method for a photovoltaic module of a battery swap station, and relates to the technical field of battery swap stations, the intelligent adjustment control method comprises a photovoltaic array module, a controller, an inverter and an alternating current load, the photovoltaic array module, the controller, the inverter and the alternating current load are connected in sequence, the controller is further connected with a battery swap station energy storage device, and the battery swap station energy storage device is connected with a battery swap station. The controller is connected with an inverter and also connected with a direct current load, the photovoltaic array module is composed of a plurality of photovoltaic cells, the controller is respectively connected with a main control module and a monitoring module, the main control module is in data communication connection with an upper computer, and the monitoring module is connected with a user and the controller. By arranging the photovoltaic array module, the controller, and the main control module and the monitoring module between the photovoltaic array module and the controller, intelligent adjustment can be quickly performed while converted large enough electric energy is transmitted into the energy storage device of the battery swap station through the controller, and the energy storage capacity and the energy storage efficiency of the energy storage device are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery swap stations, and in particular to an intelligent regulation and control method for photovoltaic components in a battery swap station. Background Art

[0002] At present, the battery-swap heavy truck green transportation (logistics) demonstration project has been successfully completed and officially put into use. The project is the first photovoltaic direct supply battery swap station in the country. In the first phase of the project, a total of 2 battery swap stations were built and put into operation, covering an area of ​​600 square meters, which can serve 100 battery swap heavy trucks. The battery swap station is unmanned, and the vehicle can achieve fully automatic energy replenishment within 3-5 minutes, which can provide transportation parties with services such as electric vehicle separation, battery rental, and replaceable and upgradeable.

[0003] It can be seen that the trend of technological integration between battery swap stations and photovoltaic components is becoming more and more obvious. With the rapid development of new energy vehicles in recent years, the cooperation between battery swap stations and photovoltaic components is becoming closer and closer. The performance and efficiency of photovoltaic power generation systems are always restricted by the level of intelligent control of the system. Therefore, the improvement of intelligent control methods and systems for energy connectivity between photovoltaic power generation and battery swap stations has become a hot topic of research. Summary of the invention

[0004] The present invention provides an intelligent regulation and control method for photovoltaic components in a battery swap station to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for intelligent regulation and control of photovoltaic components in a battery swap station includes a photovoltaic array module, a controller, an inverter, and an AC load. The photovoltaic array module, the controller, the inverter, and the AC load are connected in sequence. The controller is also connected to an energy storage device of the battery swap station. The controller is connected to the inverter and also to a DC load. The photovoltaic array module is composed of a plurality of photovoltaic cells. The controller includes a main control module and a monitoring module. The main control module is connected to a host computer for data communication, and the monitoring module connects a user and the controller.

[0006] Obtain the battery overcharge alarm voltage value, battery overcharge protection point voltage value, battery overdischarge recovery point voltage value, battery overdischarge protection point voltage value, and battery overdischarge alarm voltage value in the energy storage device system of the battery swap station, and monitor whether the above voltage values ​​meet the preset conditions. If not, send an alarm signal and cut off the power supply.

[0007] A number of photovoltaic battery units are combined in series and parallel to form a photovoltaic array module, which will output sufficiently large electric energy under the action of solar energy, and the converted sufficiently large electric energy is transmitted to the energy storage device of the battery swap station through the controller, which is used to quickly charge new energy vehicles, and the controller set in the middle can complete intelligent adjustment.

[0008] A further improvement of the technical solution of the present invention is that: the photovoltaic array module is connected to a PWM charging controller, the main circuit topology of the PWM charging controller adopts a BUCK circuit, the photovoltaic array module is connected to a temperature sensor, when the temperature sensor alarms, the IGBT in the PWM charging controller is directly turned on, and pulse width modulation is adopted, the photovoltaic array module is connected to a freewheeling diode on another path, and a Hall sensor is adopted for current and voltage isolation sampling.

[0009] The main advantage of the PWM charge controller is that it can provide well-controlled charging characteristics for the battery in the battery swap station. The use of pulse width modulation technology can maximize the function of the battery in the battery swap station, fully charge the battery in the battery swap station to reduce gasification, can be used to track the maximum power point of the photovoltaic array, and has a good temperature compensation function to effectively extend the service life of the battery in the battery swap station.

[0010] A further improvement of the technical solution of the present invention is that the core control device of the main control module in the controller is an AT89C52 single-chip microcomputer, the single-chip microcomputer controls the main circuit switch through an isolation drive circuit, and the main control module stores system operating parameters and system operating status information through EEPROM, prevents system program disorder through a detection circuit, indicates the system status through a status indication circuit, communicates data with a host computer through an RS485 communication interface, and a fan is provided in the main control module.

[0011] When the temperature is too high, the fan is used to cool the main control circuit board or the battery pack of the battery swap station. In addition, to facilitate system expansion, a unique identification number is set on the main control module using a code switch, so that one field monitoring circuit board can communicate with multiple main control circuit boards. The controller is also equipped with a backup power supply, which can temporarily power the load when the battery pack of the battery swap station cannot normally power the load.

[0012] A further improvement of the technical solution of the present invention is that: an LCD display circuit is arranged in the main control module to provide a human interaction interface for the user, and the LCD display circuit is connected to an LED indicator light, and a clock circuit is connected to the LCD display circuit.

[0013] The LED indicator light is used to display the power supply and other faults of the field monitoring module; the EEPROM circuit is used for the field monitoring module to store the historical data of the photovoltaic power generation system, and the detection circuit is used to prevent the disorder of the field monitoring module program.

[0014] A further improvement of the technical solution of the present invention lies in that the control mode of the controller specifically between the energy storage device and the photovoltaic array module of the battery swap station mainly includes the following control schemes: battery overvoltage alarm at the battery swap station, stopping charging and switching to backup power supply; cutting off the charging branch step by step, with an adjustable action interval of 1 second; the charge and discharge control does not work, and the battery pack of the battery swap station is restored to supply power to the load; charging branches are put into operation step by step, with an adjustable action interval of 30 seconds; switching to backup power supply, and charging all charging branches; battery undervoltage alarm at the battery swap station, stopping charging and switching to backup power supply.

[0015] The preset condition that the voltage value meets is the voltage value comparison, where H1 is the battery overcharge alarm voltage value, H2 is the battery overcharge protection point voltage value, H3 is the battery overdischarge recovery point voltage value, L1 is the battery overdischarge protection point voltage value, and L2 is the battery overdischarge alarm voltage value. Voltage value comparison: H1>H2>H3>L1>L2. The battery voltage value is VB.

[0016] Because the battery performance and capacity of battery swap stations in different enterprises are different, the charger in the present invention collects the temperature signal of the battery in a timely manner through the single-chip microcomputer and the detection circuit to continuously adjust the voltage value of the battery overcharge protection point, and can adjust the various parameter values ​​of the overcharge protection point voltage temperature compensation according to the battery performance of different enterprises. Specifically: Vf=Vf0+(T-T0)C, C is the voltage temperature coefficient, Vf is the charging threshold voltage temperature value, Vf0 is the battery temperature, T is the trickle charge start cycle time, and T0 is the trickle charge upper cycle start time.

[0017] The further improvement of the technical solution of the present invention is that: the monitoring module adopts a three-level measurement, control and management mode, and the highest level of the monitoring module is in the monitoring background of the monitoring center, using a PC, and accessing the public telephone network through a MODEM to realize remote data transmission with the on-site monitoring module. After the monitoring background is connected with the lower-level monitoring module, the transmission includes the collection of power station operation parameters, such as battery voltage, battery temperature, charging current, load current, the highest and lowest battery voltage of the day, the maximum charging current and the maximum discharging current of the day, and the transmission of control instructions to the on-site monitoring module of the power station; The second level of the monitoring module is a field monitoring system, and the third level of the monitoring module is a field data acquisition system.

[0018] The task of the field monitoring system is data acquisition and signal control. The field monitoring system is a master-slave bus type measurement and control system based on RS-485 field bus, custom communication protocol, external main control module and field monitoring module on the bus, and uniformly managed by the field monitoring module. It includes monitoring layer and communication layer. Among them, the monitoring layer is responsible for receiving the data uploaded by the underlying main control module for data analysis and storage, setting and modifying the operating parameters of the main control module, and querying real-time and historical data to realize the monitoring and management of the main control module equipment; the communication layer communicates with the field main control module in real time through the established communication protocol, completes data communication transmission and verification, etc. The field data acquisition system is also part of the main control module of the independent photovoltaic power generation system, which is used to collect the operating status information of the independent photovoltaic power source in real time, and can transmit various information to the field monitoring module in serial communication mode, and receive and execute the instructions of the monitoring module.

[0019] A further improvement of the technical solution of the present invention is that the internal circuit of the photovoltaic array module is isolated by optical coupling and directly connected to the A / D chip circuit, and the frequency of the single-chip microcomputer to obtain system status information is 200mS, and the system status information is obtained 5 times in 1S and then the system status information data is processed.

[0020] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art: The present invention provides an intelligent regulation and control method for photovoltaic components in a battery swap station. By setting a photovoltaic array module, a controller, and a main control module and a monitoring module therebetween, when sufficiently large converted electric energy is transmitted to an energy storage device in the battery swap station through the controller, intelligent regulation can be performed quickly, thereby improving the energy storage capacity and efficiency of the energy storage device.

[0021] The present invention provides an intelligent regulation and control method for photovoltaic components in a battery swap station. Through a charging controller and an additional power system arranged in a photovoltaic array module, a well-controlled charging characteristic is provided to the battery in the battery swap station, the battery in the battery swap station is fully charged to reduce gasification, and it can be used to track the maximum power point of the photovoltaic array. It has a good temperature compensation function and effectively prolongs the service life of the battery in the battery swap station.

[0022] The present invention provides an intelligent regulation and control method for photovoltaic components in a battery swap station. Through the main control module and the monitoring module in the controller, the main control circuit board or the battery pack of the battery swap station can be quickly cooled down. When the battery pack of the battery swap station cannot supply power to the load normally, the backup power supply temporarily supplies power to the load to ensure the integrity of the battery pack. In addition, the monitoring is timely and can quickly transmit and collect data in unsupervised emerging battery swap stations to avoid the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall system of the present invention; Figure 2 It is a structural diagram of the main control module and the monitoring module in the controller of the present invention; Figure 3 This is a schematic diagram of some pin connections of AT89C52 of the present invention; Figure 4 This is a schematic diagram of the charging control method of the controller of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1-Figure 4 The present invention provides a technical solution: including a photovoltaic array module, a controller, an inverter, and an AC load. The photovoltaic array module, the controller, the inverter, and the AC load are connected in sequence. The controller is also connected to a battery swap station energy storage device. The controller is connected to the inverter and also connected to the DC load. The photovoltaic array module is composed of a number of photovoltaic cells. The controller includes a main control module and a monitoring module. The main control module is connected to a host computer for data communication, and the monitoring module connects the user and the controller.

[0027] A number of photovoltaic battery units are combined in series and parallel to form a photovoltaic array module, which will output sufficiently large electric energy under the action of solar energy, and the converted sufficiently large electric energy is transmitted to the energy storage device of the battery swap station through the controller, which is used to quickly charge new energy vehicles, and the controller set in the middle can complete intelligent adjustment.

[0028] The photovoltaic array module is connected to a PWM charging controller. The main circuit topology of the PWM charging controller adopts a BUCK circuit. The photovoltaic array module is connected to a temperature sensor. When the temperature sensor alarms, the IGBT in the PWM charging controller is directly turned on and pulse width modulation is adopted. The other circuit of the photovoltaic array module is connected to a freewheeling diode, and a Hall sensor is used for current and voltage isolation sampling.

[0029] The main advantage of the PWM charge controller is that it can provide well-controlled charging characteristics for the battery in the battery swap station. The use of pulse width modulation technology can maximize the function of the battery in the battery swap station, fully charge the battery in the battery swap station to reduce gasification, can be used to track the maximum power point of the photovoltaic array, and has a good temperature compensation function to effectively extend the service life of the battery in the battery swap station.

[0030] The core control device of the main control module in the controller is the AT89C52 single-chip microcomputer. The single-chip microcomputer controls the main circuit switch through the isolation drive circuit, and the main control module stores the system operation parameters and system operation status information through EEPROM, prevents system program disorder through the detection circuit, indicates the system status through the status indication circuit, and communicates data with the host computer through the RS485 communication interface. A fan is also provided in the main control module.

[0031] When the temperature is too high, the fan is used to cool the main control circuit board or the battery pack of the battery swap station. In addition, to facilitate system expansion, a unique identification number is set on the main control module using a code switch, so that one field monitoring circuit board can communicate with multiple main control circuit boards. The controller is also equipped with a backup power supply, which can temporarily power the load when the battery pack of the battery swap station cannot normally power the load.

[0032] An LCD display circuit is arranged in the main control module to provide a human interaction interface for the user, and the LCD display circuit is connected to an LED indicator light, and a clock circuit is connected in the LCD display circuit.

[0033] The LED indicator light is used to display the power supply and other faults of the field monitoring module; the EEPROM circuit is used for the field monitoring module to store the historical data of the photovoltaic power generation system, and the detection circuit is used to prevent the disorder of the field monitoring module program.

[0034] The specific control methods of the controller between the energy storage device and the photovoltaic array module of the battery swap station mainly include the following control schemes: battery overvoltage alarm at the battery swap station, stop charging and switch to backup power supply; cut off the charging branch step by step, and the action interval time is adjustable to 1 second; if the charge and discharge control does not work, the battery pack of the battery swap station is restored to supply power to the load; the charging branch is put into operation step by step, and the action interval time is adjustable to 30 seconds; switch to backup power supply and put all charging branches into charging; battery undervoltage alarm at the battery swap station, stop charging and switch to backup power supply.

[0035] Among them, H1 is the battery overcharge alarm voltage value, H2 is the battery overcharge protection point voltage value, H3 is the battery overdischarge recovery point voltage value, L1 is the battery overdischarge protection point voltage value, and L2 is the battery overdischarge alarm voltage value. Voltage value comparison: H1>H2> H3>L1>L2. The battery voltage value is VB.

[0036] Because the battery performance and capacity of battery swap stations in different enterprises are different, the charger in the present invention collects the temperature signal of the battery in a timely manner through the single-chip computer and the detection circuit to continuously adjust the voltage value of the battery overcharge protection point, and can adjust the various parameter values ​​of the overcharge protection point voltage temperature compensation according to the battery performance of different enterprises. Specifically: Vf=Vf0+(T-T0)C, C is the voltage temperature coefficient.

[0037] The monitoring module adopts a three-level measurement, control and management mode. The highest level of the monitoring module is located in the monitoring background of the monitoring center. It uses a PC and accesses the public telephone network through a MODEM to achieve remote data transmission with the on-site monitoring module. After the monitoring background is connected to the lower-level monitoring module, the transmission includes the collection of power station operation parameters, such as battery voltage, battery temperature, charging current, load current, the highest and lowest battery voltage of the day, the maximum charging current and the maximum discharge current of the day, and the transmission of control instructions to the on-site monitoring module of the power station; The second level of the monitoring module is the on-site monitoring system, and the third level of the monitoring module is the on-site data acquisition system.

[0038] The task of the field monitoring system is data acquisition and signal control. The field monitoring system is a master-slave bus type measurement and control system based on RS-485 field bus, custom communication protocol, external main control module and field monitoring module on the bus, and uniformly managed by the field monitoring module. It includes monitoring layer and communication layer. Among them, the monitoring layer is responsible for receiving the data uploaded by the underlying main control module for data analysis and storage, setting and modifying the operating parameters of the main control module, and querying real-time and historical data to realize the monitoring and management of the main control module equipment; the communication layer communicates with the field main control module in real time through the established communication protocol, completes data communication transmission and verification, etc. The field data acquisition system is also part of the main control module of the independent photovoltaic power generation system, which is used to collect the operating status information of the independent photovoltaic power source in real time, and can transmit various information to the field monitoring module in serial communication mode, and receive and execute the instructions of the monitoring module.

[0039] The internal circuit of the photovoltaic array module adopts optical coupling isolation and is directly connected to the A / D chip circuit. The frequency of the single-chip microcomputer to obtain system status information is 200mS, and the system status information is obtained 5 times in 1S and then the system status information data is processed.

[0040] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for intelligent regulation and control of photovoltaic components in a battery swap station, comprising an intelligent regulation and control system for photovoltaic components in a battery swap station, wherein the system further comprises a photovoltaic array module, a controller, an inverter, and an AC load, wherein the photovoltaic array module, the controller, the inverter, and the AC load are connected in sequence, and characterized in that: The controller is also connected to a power storage device of a battery swap station, the controller is connected to an inverter and also to a DC load, the photovoltaic array module is composed of a number of photovoltaic cells, the controller includes a main control module and a monitoring module, the main control module is connected to a host computer for data communication, and the monitoring module is connected to a user and the controller, The intelligent regulation and control system of photovoltaic components in the battery swap station obtains the battery overcharge alarm voltage value, battery overcharge protection point voltage value, battery overdischarge recovery point voltage value, battery overdischarge protection point voltage value, and battery overdischarge alarm voltage value in the energy storage device system of the battery swap station, and monitors whether the above voltage values ​​meet the preset conditions. If not, an alarm signal is sent and the power supply is cut off.

2. According to claim 1, a method for intelligent regulation and control of photovoltaic components in a battery swap station is characterized in that: The photovoltaic array module is connected to a PWM charging controller, and the main circuit topology of the PWM charging controller adopts a BUCK circuit. The photovoltaic array module is connected to a temperature sensor. When the temperature sensor alarms, the IGBT in the PWM charging controller is directly turned on and pulse width modulation is adopted. The photovoltaic array module is connected to a freewheeling diode on another circuit, and a Hall sensor is adopted for current and voltage isolation sampling.

3. According to claim 1, a method for intelligent regulation and control of photovoltaic components in a battery swap station is characterized in that: The core control device of the main control module in the controller is an AT89C52 single-chip microcomputer, which controls the main circuit switch through an isolation drive circuit, and the main control module stores system operating parameters and system operating status information through EEPROM, prevents system program disorder through a detection circuit, indicates the system status through a status indication circuit, and communicates data with a host computer through an RS485 communication interface, and a fan is provided in the main control module.

4. According to claim 3, a method for intelligent regulation and control of photovoltaic components in a battery swap station is characterized in that: The main control module is provided with an LCD display circuit to provide a human interaction interface for the user, and the LCD display circuit is connected to an LED indicator light, and a clock circuit is connected to the LCD display circuit.

5. According to claim 4, a method for intelligent regulation and control of photovoltaic components in a battery swap station is characterized in that: The controller specifically controls the energy storage device and the photovoltaic array module in the battery swap station in the following ways: the battery swap station alarms for overvoltage, stops charging and switches to the backup power supply; the charging branches are cut off step by step, and the action interval is adjustable; the charge and discharge control does not work, and the battery pack in the battery swap station is restored to supply power to the load; the charging branches are put into operation step by step, and the action interval is adjustable; the backup power supply is switched to charge all charging branches; the battery swap station alarms for undervoltage, stops charging and switches to the backup power supply.

6. The intelligent regulation and control method for photovoltaic components in a battery swap station according to claim 5 is characterized in that: The monitoring module adopts a three-level measurement, control and management mode. The highest level of the monitoring module is in the monitoring background of the monitoring center, which uses a PC to access the public telephone network through a MODEM to achieve remote data transmission with the on-site monitoring module. After the monitoring background is connected with the lower-level monitoring module, the transmission includes the collection of power station operation parameters and the transmission of control instructions to the on-site monitoring module of the power station; The second level of the monitoring module is a field monitoring system, and the third level of the monitoring module is a field data acquisition system.

7. The intelligent regulation and control method for photovoltaic components in a battery swap station according to claim 1 is characterized in that: The internal circuit of the photovoltaic array module is isolated by optical coupling and directly connected to the A / D chip circuit, and the frequency of the single-chip microcomputer to collect system status information is 200mS, and the system status information can be collected multiple times per unit time and then the system status information data is processed.

8. The intelligent regulation and control method for photovoltaic components in a battery swap station according to any one of claims 1 to 7, characterized in that: The preset condition that the voltage value meets is the voltage value comparison, that is: Comparison of voltage values: H1>H2>H3>L1>L2, where H1 is the battery overcharge alarm voltage value, H2 is the battery overcharge protection point voltage value, H3 is the battery overdischarge recovery point voltage value, L1 is the battery overdischarge protection point voltage value, and L2 is the battery overdischarge alarm voltage value.

9. The intelligent regulation and control method for photovoltaic components in a battery swap station according to any one of claims 1 to 7, characterized in that: The battery performance can also be adjusted to the overcharge protection point voltage temperature compensation verification step, and the verification step meets the following conditions: Vf=Vf0+(T-T0)C, where C is the voltage temperature coefficient, Vf is the charging threshold voltage temperature value, Vf0 is the battery temperature, T is the trickle charge start cycle time, and T0 is the trickle charge upper cycle start time.

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