Base station energy consumption control system

Abstract

The invention provides a base station energy consumption control system. The base station energy consumption control system comprises a base station energy consumption control edge gateway, a base station environment energy consumption management and control module in communication connection with the base station energy consumption control edge gateway, a base station transmitting unit hard turn-off module and an energy storage power distribution module, the base station environment energy consumption management and control module comprises an air conditioner starting and stopping management and control unit and an air conditioner outdoor unit spraying control unit. The energy storage and power distribution module comprises a power supply state energy storage control unit, a non-power supply state energy storage control unit and a power distribution time setting unit; according to the invention, the base station energy consumption control edge gateway carries out comprehensive management and control on each device of the base station, thereby reducing the energy consumption of the base station, prolonging the service life of the energy storage power supply, and achieving the purpose of reducing the operation and maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of base station energy regulation and control, and in particular to a base station energy consumption control system. Background Art

[0002] Since the 2G era, the energy consumption of communication networks has continued to rise. While users enjoy better coverage and higher network speeds, operators are also continuously building networks. More base stations, wider frequency bands, larger bandwidths, and stronger processing capabilities have led to an increase in power consumption. Compared with 4G base stations, 5G not only increases power consumption by nearly 3 times, but also the number of 5G base stations is also increasing exponentially due to the attenuation of coverage.

[0003] Therefore, during the operation and maintenance of 5G base stations, reducing base station energy consumption and saving operating costs are urgent issues that need to be resolved. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a base station energy consumption control system, which solves the problem in the prior art that the base station energy consumption cannot be effectively reduced and the operating costs cannot be saved during the operation and maintenance of 5G base stations.

[0005] According to an embodiment of the present invention, a base station energy consumption control system includes: a base station energy consumption control edge gateway, a base station environment energy consumption control module communicatively connected to the base station energy consumption control edge gateway, a base station transmitting unit hard shutdown module and an energy storage distribution module;

[0006] The base station environmental energy consumption control module includes an air conditioner start-stop control unit and an air conditioner outdoor unit spray control unit; the air conditioner start-stop control unit is used to set the number of air conditioner starts and the air conditioner start time; the air conditioner outdoor unit spray control unit is used to control the spray system to spray the air conditioner outdoor unit;

[0007] The base station transmitting unit hard shutdown module is used to set the base station transmitting device working time;

[0008] The energy storage and distribution module includes a power supply state energy storage control unit, a non-power supply state energy storage control unit, and a power distribution time setting unit; the power supply state energy storage control unit is used to adjust the voltage and current values ​​of each lithium battery cell in the energy storage power supply through the iron-lithium battery control device when the energy storage power supply is supplying power; the non-power supply state energy storage control unit is used to adjust the voltage and current values ​​of each lithium battery cell in the energy storage power supply through the iron-lithium battery control device when the energy storage power supply is not supplying power; the power distribution time setting unit is used to set the power supply time according to the energy storage situation of the energy storage power supply.

[0009] Compared with the prior art, the present invention has the following beneficial effects: the base station environmental energy consumption control module comprehensively controls the operation of the base station air conditioner and the spray system in the base station, reduces the number of air conditioner startups, improves the air conditioner heat dissipation efficiency, and reduces the air conditioner energy consumption. The base station transmitting unit hard shutdown module hard shuts down the base station transmitting equipment during idle periods, further reducing the energy consumption of the base station. On the one hand, the energy storage and distribution module predicts the energy storage status of the energy storage power supply and reasonably allocates the power supply time of each energy storage power supply; on the other hand, based on the two states of the energy storage power supply, namely the state of power supply and the state of no power supply, all lithium batteries of the energy storage power supply are adjusted for consistency, thereby extending the service life of the energy storage power supply and saving operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A structural diagram of a base station energy consumption control system according to an embodiment of the present invention;

[0011] Figure 2 A diagram of the steps of a method implemented by a spray control unit of an air conditioner outdoor unit according to an embodiment of the present invention;

[0012] Figure 3 This is a schematic diagram of the structure of a lithium iron battery control device according to an embodiment of the present invention;

[0013] Figure 4 A diagram of the steps of a method implemented by a power supply state energy storage control unit according to an embodiment of the present invention;

[0014] Figure 5 A diagram of the steps of a method implemented by an energy storage control unit in a non-powered state according to an embodiment of the present invention;

[0015] Figure 6 A diagram of the steps of a method implemented by a power distribution time setting unit according to an embodiment of the present invention;

[0016] Figure 7 This is a schematic diagram of the structure of the total discharge duration prediction model according to an embodiment of the present invention;

[0017] Figure 8 The total discharge time and current variation law in the existing total discharge time prediction model;

[0018] Fig. 9 The total discharge time and current variation law in the total discharge time prediction model of the embodiment of the present invention;

[0019] Fig.10 The discharge curve diagram of the battery of the embodiment of the present invention at different currents;

[0020] Fig.11 This is a flow chart of a feedforward neural network model according to an embodiment of the present invention;

[0021] Fig.12Result comparison diagram of discharge curve at 20A current of an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, an embodiment of the present invention proposes a base station energy consumption control system, including a base station energy consumption control edge gateway 11, a base station environmental energy consumption management and control module 12 communicated with the base station energy consumption control edge gateway 11, a base station transmitting unit hard shutdown module 13 and an energy storage distribution module 14.

[0024] Among them, the base station energy consumption control edge gateway 11 realizes comprehensive management and control of various equipment in the base station through communication and remote control with the base station environment energy consumption control module 12, the base station transmission unit hard shutdown module 13 and the energy storage distribution module 14.

[0025] The base station environmental energy consumption control module includes an air conditioner start-stop control unit and an air conditioner outdoor unit spray control unit; the air conditioner start-stop control unit is used to set the number of air conditioner starts and the air conditioner start time; the air conditioner outdoor unit spray control unit is used to control the spray system to spray the air conditioner outdoor unit;

[0026] The base station transmitting unit hard shutdown module is used to set the base station transmitting device working time;

[0027] The energy storage and distribution module includes a power supply state energy storage control unit, a non-power supply state energy storage control unit, and a power distribution time setting unit; the power supply state energy storage control unit is used to adjust the voltage and current values ​​of each lithium battery cell in the energy storage power supply through the iron-lithium battery control device when the energy storage power supply is supplying power; the non-power supply state energy storage control unit is used to adjust the voltage and current values ​​of each lithium battery cell in the energy storage power supply through the iron-lithium battery control device when the energy storage power supply is not supplying power; the power distribution time setting unit is used to set the power supply time according to the energy storage situation of the energy storage power supply.

[0028] The detailed working process of this embodiment is as follows: the base station environmental energy consumption control module comprehensively controls the operation of the base station air conditioner and the spray system in the base station, reduces the number of air conditioner startups, improves the air conditioner heat dissipation efficiency, and reduces the air conditioner energy consumption. The base station transmitting unit hard shutdown module hard shuts down the base station transmitting equipment during idle periods to further reduce the energy consumption of the base station. On the one hand, the energy storage and distribution module predicts the energy storage status of the energy storage power supply and reasonably allocates the power supply time of each energy storage power supply; on the other hand, based on the two states of the energy storage power supply, namely the state of power supply and the state of no power supply, all lithium batteries of the energy storage power supply are adjusted for consistency to extend the service life of the energy storage power supply.

[0029] In the example of the present invention, the control spray system includes a water storage device and a spray device; the water storage device includes a water receiving tray, a condensed water delivery pipe and a water storage tank; the water receiving tray is arranged below the condenser, one end of the condensed water delivery pipe is connected to the water receiving tray, and the other end is connected to the water inlet of the water storage tank; the spray device includes a water pump and a spray head; the water inlet of the water pump is connected to the water outlet of the water storage tank, and the water outlet of the water pump is connected to the spray head. Based on this, if Figure 2 As shown, the air conditioner outdoor unit spray control unit implements the following steps:

[0030] S11, obtaining the outdoor temperature, the condenser fin temperature, the amount of water in the water storage tank and the current time, and calculating the temperature difference between the condenser fin temperature and the outdoor temperature;

[0031] S12, when the outdoor temperature is greater than the first temperature threshold, the condenser fin temperature is higher than the outdoor temperature by 5°C and the current time is within the first time interval, the high temperature control mode is turned on; when the outdoor temperature is less than or equal to the first temperature threshold and greater than the second temperature threshold, the temperature difference between the condenser fin temperature and the outdoor temperature is greater than 3°C and the current time is within the second time interval, the conventional control mode is turned on; when the outdoor temperature is less than or equal to the second temperature threshold, the temperature difference between the condenser fin temperature and the outdoor temperature is greater than 3°C and the current time is within the second time interval, the low temperature control mode is turned on; the first temperature threshold is greater than the second temperature threshold;

[0032] S13, generating water spray control parameters according to the adopted control mode and the amount of water in the water tank;

[0033] S14. Control the spraying device to perform the spraying operation according to the generated water spraying control parameters.

[0034] For the above step S11, in the embodiment of the present invention, the outdoor temperature is obtained by a temperature sensor arranged outdoors, the condenser fin temperature is obtained by a temperature sensor arranged on the condenser fin, the water level in the water tank is obtained by a water level sensor arranged inside the water tank, and the water volume in the water tank is calculated based on the water level in the water tank and the bottom area of ​​the water tank.

[0035] For the above step S12, specifically, temperature difference = outdoor temperature - condenser fin temperature.

[0036] For the above step S13, when the outdoor temperature is greater than the first temperature threshold, the condenser fin temperature is higher than the outdoor temperature by 5°C, and the current time is within the first time interval, the high temperature control mode is turned on. When the outdoor temperature is less than or equal to the first temperature threshold and greater than the second temperature threshold, the temperature difference between the condenser fin temperature and the outdoor temperature is greater than 3°C, and the current time is within the second time interval, the conventional control mode is turned on. When the outdoor temperature is less than or equal to the second temperature threshold, the temperature difference between the condenser fin temperature and the outdoor temperature is greater than 3°C, and the current time is within the second time interval, the low temperature control mode is turned on. When the outdoor temperature is less than or equal to the first temperature threshold and greater than the second temperature threshold, the temperature difference between the condenser fin temperature and the outdoor temperature is less than or equal to 3°C, and the water volume in the water storage tank is greater than the water volume threshold, the intermittent flow control mode is turned on. In this embodiment, the water volume threshold is 3000ml. When the outdoor temperature is less than or equal to the second temperature threshold, and the temperature difference between the condenser fin temperature and the outdoor temperature is less than or equal to 3°C, the overflow port is opened and the continuous flow control mode is turned on. In all other cases, the initial control mode is turned on.

[0037] The first temperature threshold is greater than the second temperature threshold. In this embodiment, the first temperature threshold is 35° C. and the second temperature threshold is 5° C. The first time interval is from 13:00 to 17:00, and the second time interval is from 9:00 to 18:00.

[0038] For the above step S14, if the adopted control mode is the high temperature control mode, the first water spraying interval function and the first water spraying duration function are called to generate the water spraying interval and the water spraying duration respectively.

[0039] The first water spray interval function is as follows:

[0040]

[0041] Where, ΔT 1 The water spray interval generated by the first water spray interval function, b 1 is the latest time point in the first time interval, t is the current time, and V is the amount of water in the water tank; in this embodiment, the latest time point b in the first time interval 1 It is 17:00.

[0042] The first water spray duration function is as follows:

[0043]

[0044] Where, T 1 is the water spraying duration generated by the first water spraying duration function, and Q is the flow rate of the water pump.

[0045] In the high-temperature control mode, first, the water pump is controlled to be turned on, so that the collected condensed water is sprayed onto the condenser fins through the sprinkler head. When the spraying time of the sprinkler head reaches the spraying time generated by the first spraying time function, the water pump is controlled to be turned off, and after the water pump off time reaches the spraying interval generated by the first spraying interval function, the water pump is controlled to be turned on again, so that the collected condensed water is sprayed onto the condenser fins again through the sprinkler head, and so on.

[0046] If the adopted control mode is the conventional control mode, the second water spraying interval function and the second water spraying duration function are called to generate the water spraying interval and the water spraying duration respectively.

[0047] The second water spray interval function is as follows:

[0048]

[0049] Where, ΔT 2 The water spray interval generated by the second water spray interval function, b 2 is the latest time point of the second time interval, t is the current time, and V is the amount of water in the water tank; in this embodiment, the latest time point b of the second time interval 2 is 18:00.

[0050] The second water spray duration function is as follows:

[0051]

[0052] Where, T 2 is the water spraying duration generated by the second water spraying duration function, and Q is the flow rate of the water pump.

[0053] In the normal control mode, first, the water pump is controlled to be turned on, so that the collected condensed water is sprayed onto the condenser fins through the sprinkler head. When the spraying time of the sprinkler head reaches the spraying time generated by the second spraying time function, the water pump is controlled to be turned off, and after the water pump off time reaches the spraying interval generated by the second spraying interval function, the water pump is controlled to be turned on again, so that the collected condensed water is sprayed onto the condenser fins again through the sprinkler head, and so on.

[0054] If the adopted control mode is the low temperature control mode, the third water spraying interval function and the third water spraying duration function are called to generate the water spraying interval and the water spraying duration respectively;

[0055] The third water spray interval function is as follows:

[0056]

[0057] Where, ΔT 3 The water spray interval generated by the third water spray interval function, b 2is the latest time point in the second time interval, t is the current time, and V is the amount of water in the water tank;

[0058] The third water spray duration function is as follows:

[0059]

[0060] Where, T 3 is the water spraying duration generated by the third water spraying duration function, and Q is the flow rate of the water pump.

[0061] In the low temperature control mode, first, the water pump is controlled to be turned on, so that the collected condensed water is sprayed onto the condenser fins through the sprinkler head. When the spraying time of the sprinkler head reaches the spraying time generated by the third spraying time function, the water pump is controlled to be turned off. After the water pump off time reaches the spraying interval generated by the third spraying interval function, the water pump is controlled to be turned on again, so that the collected condensed water is sprayed onto the condenser fins again through the sprinkler head, and so on.

[0062] If the adopted control mode is the intermittent flow control mode, the water spraying interval is generated to be 6 minutes, and the fourth water spraying duration function is called to generate the water spraying duration;

[0063] The fourth water spray duration function is as follows:

[0064]

[0065] Where, T 4 is the water spraying duration generated by the fourth water spraying duration function, and Q is the flow rate of the water pump.

[0066] In the intermittent flow control mode, first, the water pump is controlled to turn on so that the collected condensed water is sprayed onto the condenser fins through the sprinkler head. When the spraying time of the sprinkler head reaches the spraying time generated by the fourth spraying time function, the water pump is controlled to turn off. After the water pump is turned off for 6 minutes, the water pump is controlled to turn on again so that the collected condensed water is sprayed onto the condenser fins again through the sprinkler head, and so on.

[0067] If the control mode adopted is the continuous flow control mode, the overflow port is opened and the water pump is controlled to be normally closed. That is, in this control mode, the water spraying interval is ∞ and the water spraying time is 0s.

[0068] like Figure 3As shown, the iron-lithium battery control device includes a lithium battery terminal voltage data acquisition module 11, an iron-lithium battery through current acquisition module 12, a switch array 13, an adjustable voltage and current meter 14, a control processor 15, and an adjustable resistor 16. The lithium battery terminal voltage data acquisition module 11 is connected to the positive electrode of each lithium battery dn through an external cable, and is electrically connected to the control processor 15, and is used to collect the voltage of each lithium battery dn; one end of the iron-lithium battery through current acquisition module 12 is connected to the positive electrode of the iron-lithium battery D through an external cable, and the other end is electrically connected to the control processor 15, and is used to collect the through current of the iron-lithium battery D; the switch array 13 includes N+1 array switches KN+1, and the positive electrode of each lithium battery dn and the negative electrode of each lithium battery dn are connected to one end of an array switch KN+1, wherein one end of the 2n-1th array switch K2n-1 is connected to the positive electrode of a lithium battery dn. Positive electrode, one end of the 2nth array switch K2n is connected to the negative electrode of a lithium battery cell dn; the adjustable voltage and current device 14 includes a first positive switch KA1, a second positive switch KA2, a first negative switch KA3, a second negative switch KA4 and a first control end F1 electrically connected to the control processor 15, the first positive switch KA1 is connected to the other end of the 2n-1th array switch K2n-1, the second positive switch KA2 is connected to the other end of the 2nth array switch K2n, the first negative switch KA3 is connected to the other end of the 2n-1th array switch K2n-1, and the second negative switch KA4 is connected to the other end of the 2nth array switch K2n. The adjustable resistor 16 includes a third positive switch KB1, a fourth positive switch KB2, a third negative switch KB3, a fourth negative switch KB4 and a second control terminal F2 connected to the control processor 15, the third positive switch KB1 is connected to the other end of the 2n-1th array switch, the fourth positive switch KB2 is connected to the other end of the 2n-1th array switch, the third negative switch KB3 is connected to the other end of the 2n-1th array switch, and the fourth positive switch KB4 is connected to the other end of the 2n-1th array switch.

[0069] based on Figure 3 ,like Figure 4 As shown, the power supply state energy storage control unit implements the following steps:

[0070] S21, measuring the cell voltage of each lithium battery cell;

[0071] S22, when the lithium iron battery is in a variable current discharge state, a first average voltage based on N lithium batteries and a difference between the battery voltage of each lithium battery and the first average voltage are calculated, and the nth lithium battery is judged to be in a slow power drop state, a fast power drop state or a normal variable current discharge state according to the difference between the battery voltage of the nth lithium battery and the first average voltage, where n is a positive integer less than or equal to N, and N is a positive integer;

[0072] S23. According to S22, when the nth lithium battery cell is in a state of slow power reduction, the iron-lithium battery control device is adjusted so that the adjustable resistor is connected in series with the nth lithium battery cell, and the resistance value of the adjustable resistor is calculated and set using the first control function;

[0073] S24, according to S22, when the nth lithium battery cell is in a state of rapid power drop, adjusting the iron-lithium battery control device so that the adjustable voltage and current device is connected in parallel with the nth lithium battery cell, and using the second control function to calculate the current value and voltage value of the adjustable voltage and current device and set them;

[0074] Each time the iron-lithium battery control device is adjusted in S25 and S23, or each time the iron-lithium battery control device is adjusted in S24, the process returns to S21 until the nth lithium battery cell is in a normal variable current discharge state according to S22, and the control is terminated.

[0075] For the above step S21, it should be noted that each time this step S21 is repeated, each lithium battery cell of the iron-lithium battery is measured based on the state that the adjustable resistor is not connected, the adjustable voltage and current meter is not connected, and the adjustable resistor and the adjustable voltage and current meter are not connected at the same time.

[0076] The above step S22 is used to determine the specific situation of the nth lithium battery cell being an iron-lithium battery in the variable current discharge state supplying power to the communication load, the power slow drop state, the power fast drop state, and the normal variable current discharge state, and is processed through the following steps S3 to S24.

[0077] The above step S23 is a processing method for the nth lithium battery cell in the above step S22 being in a state of slow power reduction, that is, adjusting the iron-lithium battery control device so that the adjustable resistor is connected in series with the nth lithium battery cell, thereby accelerating the power consumption of the nth lithium battery cell. Among them, the judgment condition that the nth lithium battery cell is in a state of slow power reduction is: if the difference between the cell voltage of the nth lithium battery cell and the first average voltage is greater than 0 and greater than the first power supply threshold, and the cell voltage of the nth lithium battery cell is higher than the cell voltage of the remaining lithium batteries, then the nth lithium battery cell is in a state of slow power reduction.

[0078] In a preferred implementation, the first power supply threshold is 0.3. Then the judgment condition that the nth lithium battery cell is in a state of slow power reduction is expressed by the formula:

[0079] Vn-VM>0, and Vn-VM>0.3.

[0080] Exemplarily, in the above step S23, the resistance value of the adjustable resistor is calculated using the first control function, and the formula is:

[0081] Rt = ROUND(Rn*10);

[0082] Rn=VM / 5;

[0083] Among them, Rt is the number of switches that open the adjustable resistor, turning on the switch of one adjustable resistor means that the resistance value of the adjustable resistor increases by 0.1 ohms, Rn is the resistance value of the adjustable resistor obtained by calculating using the first control function, and VM is the difference between the cell voltage of the nth lithium battery cell and the discharge termination voltage.

[0084] It should be noted that the execution cycle of the above step S23 is:

[0085] Measuring the target voltage of the nth lithium battery cell after the nth lithium battery cell is connected in series with the adjustable resistor;

[0086] The average voltage A is calculated based on the target voltage and the cell voltages of the remaining lithium battery cells measured in S21. If the difference between the target voltage and the average voltage A is less than or equal to 0.3, the first positive switch, the second positive switch, the first negative switch, the second negative switch and the N+1 array switches of the adjustable resistor are adjusted to end the connection relationship between the adjustable resistor and the nth lithium battery cell; if the difference between the target voltage and the average voltage A is greater than 0.3, the connection relationship between the adjustable resistor and the nth lithium battery cell is maintained.

[0087] The above step S24 is a processing method for the nth lithium battery cell in the above step S22 being in a state of rapid power reduction, that is, adjusting the lithium iron battery control device so that the adjustable voltage and current device is connected in parallel with the nth lithium battery cell, thereby slowing down the speed of power reduction of the nth lithium battery cell. Among them, the judgment condition that the nth lithium battery cell is in a state of rapid power reduction is: if the difference between the cell voltage of the nth lithium battery cell and the first average voltage is less than 0, and the absolute value of the difference between the cell voltage of the nth lithium battery cell and the first average voltage is greater than the first power supply threshold, and the cell voltage of the nth lithium battery cell is lower than the cell voltage of the remaining lithium batteries, then the nth lithium battery cell is in a state of rapid power reduction.

[0088] In a preferred implementation, the first power supply threshold is 0.3. Then the judgment condition that the nth lithium battery cell is in a state of rapid power reduction is expressed by the formula:

[0089] Vn-VM<0, and |Vn-VM|>0.3.

[0090] Exemplarily, in the above step S24, using the second control function to calculate the voltage value of the adjustable voltage and current device includes:

[0091] Subtracting the cell voltage of the nth lithium battery cell from the first average voltage to obtain a standby voltage value;

[0092] At every preset time interval, record the average value of the sampled voltage;

[0093] According to the average values ​​of multiple sampled voltages recorded within multiple preset times and the standby voltage value, the voltage value of the adjustable voltage and current device is outputted, and the formula is:

[0094] Vε=Vα+(M 1 +M 2 +...+M 20 ) / 20

[0095] Among them, M 1 is the average value of the sampled voltage recorded within the first preset time, M 2 is the average value of the sampled voltage recorded within the second preset time, M 20 is the average value of the sampled voltage recorded within the twentieth preset time, Vε is the voltage value of the adjustable voltage and current device obtained using the second control function, and Vα is the standby voltage value.

[0096] Exemplarily, in the above step S24, using the second control function to calculate the current value of the adjustable voltage and current device includes:

[0097] Record the average value of the sampled current at each preset time interval;

[0098] The standby current value is calculated based on the average value of multiple sampled currents recorded within multiple preset times:

[0099] The current value of the adjustable voltage and current device is outputted according to the standby current value and the voltage value of the adjustable voltage and current device.

[0100] In the embodiment of the present invention, the preset time is 1 minute, and the average value of the sampled currents with a 1-minute interval can be obtained and recorded in the historical data to obtain the average values ​​of multiple sampled currents within 20 minutes. Based on this, the standby current value is calculated according to the average values ​​of multiple sampled currents recorded within multiple preset times, and the formula is:

[0101] IN=(I△t 1 +I△t 2 +...+I△t 20 ) / 20;

[0102] Among them, IN is the standby current value, △t 1 is the first minute within 20 minutes, △t 2 is the second minute within 20 minutes, ..., △t 20 The twentieth minute within 20 minutes.

[0103] It should be noted that when using the second control function to calculate the current value of the adjustable voltage and current meter, if the execution time of outputting the current value of the adjustable voltage and current meter based on the standby current value and the voltage value of the adjustable voltage and current meter exceeds 5 minutes, then return to re-record the sampled current average value.

[0104] Wherein, outputting the current value of the adjustable voltage and current device according to the standby current value and the voltage value of the adjustable voltage and current device comprises:

[0105] If the standby current value is less than the first standard current, the voltage value of the adjustable voltage and current device is calculated by dividing the voltage value of the adjustable voltage and current device by the first preset current value of the first resistance value; and when the first preset current value is less than or equal to the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=3; when the first preset current value is greater than the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=Vε / R1+3;

[0106] If the standby current value is greater than or equal to the first standard current and less than the second standard current, the voltage value of the adjustable voltage and current meter is divided by the second preset current value of the second resistance value; and when the second preset current value is less than or equal to the target value, the calculation formula of the current value of the adjustable voltage and current meter is: Iε=5+IN / 30; when the second preset current value is greater than the target value, the calculation formula of the current value of the adjustable voltage and current meter is: Iε=Vε / R1+IN / 15;

[0107] If the standby current value is greater than or equal to the second standard current and less than the third standard current, the voltage value of the adjustable voltage and current device is calculated by dividing the third preset current value of the third resistance value; and when the third preset current value is less than or equal to the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=7+IN / 30; when the third preset current value is greater than the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=Vε / R2+IN / 30;

[0108] If the standby current value is greater than or equal to the third standard current, the current value of the adjustable voltage and current device is calculated as follows: Iε=8+IN / 50;

[0109] Wherein, Iε is the current value of the adjustable voltage and current device, Vε is the voltage value of the adjustable voltage and current device, IN is the standby current value, R1 is the first resistance value, and R2 is the second resistance value. In a better implementation, the first standard current is 15, the second standard current is 30, the third standard current is 50, the first preset current value is Vε / R1, the second preset current value is Vε / R2, the third preset current value is Vε / R3, the first resistance value R1 is 0.05Ω, the second resistance value R2 is 0.07Ω, and the third resistance value R3 is 0.09Ω.

[0110] It should be noted that the execution cycle of the above step S24 is:

[0111] After the nth lithium battery cell is connected in parallel with the adjustable voltage and current device, the target voltage across the nth lithium battery cell is measured, and the average voltage B is calculated based on the target voltage and the cell voltages of the remaining lithium batteries measured in S21, as well as the difference between the target voltage and the average voltage B;

[0112] If the difference between the target voltage and the average voltage B is greater than 0 and less than 0.3, the first positive switch, the second positive switch, the first negative switch, the second negative switch and the N+1 array switches of the adjustable voltage and current device are adjusted to terminate the connection relationship between the adjustable voltage and current device and the nth lithium battery cell; if the difference between the target voltage and the average voltage B is less than or equal to 0, the connection relationship between the adjustable voltage and current device and the nth lithium battery cell is maintained;

[0113] It can be understood that if, through step S22, the nth lithium battery cell is in the normal variable current discharge state in the variable current discharge state, then step S25 is directly performed to end the control. Among them, the judgment condition that the nth lithium battery cell is in the normal variable current discharge state is: if the difference between the cell voltage of the nth lithium battery cell and the first average voltage is greater than 0, and is less than or equal to the first power supply threshold, or the difference between the cell voltage of the nth lithium battery cell and the first average voltage is less than 0, and the absolute value of the difference between the cell voltage of the nth lithium battery cell and the first average voltage is less than or equal to the first power supply threshold, then the nth lithium battery cell is in the normal variable current discharge state.

[0114] In a preferred implementation, the first power supply threshold is 0.3. Then the judgment condition that the nth lithium battery cell is in a normal variable current discharge state is expressed by the formula:

[0115] Vn-VM>0, and Vn-VM≤0.3;

[0116] or,

[0117] Vn-VM<0, and |Vn-VM|≤0.3.

[0118] For the above-mentioned step S25, the embodiment of the present invention performs the above-mentioned steps S21 to S25 on each of the N lithium cells of the iron-lithium battery, where there is a cell with a faster capacity decrease rate or a cell with a capacity decrease rate that is too slow, so as to achieve the control purpose of making the cell voltage of each lithium cell converge to a consistent state during the variable current discharge process.

[0119] In addition, it should be noted that each time S21 to S24 are repeated, the premise is that the state of the iron-lithium battery does not change. Figure 2 As shown, the embodiment of the present invention shows the application process of steps S21 to S26 for the variable current discharge state of the iron-lithium battery. Among them, when S21 is executed for the first time, it is found that the iron-lithium battery is in the variable current discharge state, and the contents of steps S22, S23, and S24 are executed in sequence. After step S25, S21 is executed again. At this time, the iron-lithium battery is still in the variable current discharge state, and it will not jump to the judgment that the iron-lithium battery is in other states. Therefore, the contents of steps S22, S23, and S24 are continued to be executed until, in the judgment of step S22, the nth lithium battery cell is in the normal variable current discharge state.

[0120] Through the above steps S21 to S25, the embodiment of the present invention executes the control method based on the iron-lithium battery through the iron-lithium battery control device. When the lithium battery is in the variable current discharge state, the cell voltage of each lithium battery cell is measured, and the detailed charging state of the lithium battery cell is determined by analyzing the difference between the cell voltage of a lithium battery cell and the first average voltage, that is, the power slow-down state, the power fast-down state or the normal variable current discharge state. And proposes a convergence control method under different abnormal states, that is, the iron-lithium battery control device is adjusted in the power slow-down state so that the adjustable resistor is connected in series with the nth lithium battery cell, and the iron-lithium battery control device is adjusted in the power fast-down state so that the adjustable voltage and current device is connected in parallel with the nth lithium battery cell. After multiple adjustments, the lithium battery is finally in the variable current discharge state, and each lithium battery cell is in the normal variable current discharge state. The present invention avoids the problem that the voltage of individual lithium batteries drops faster or slower, resulting in a decrease in the performance of the entire iron-lithium battery and a significant shortening of its life.

[0121] based on Figure 2 ,like Figure 5 As shown, the non-powered state energy storage control unit implements the following steps:

[0122] S31, measuring the cell voltage of each lithium battery cell;

[0123] S321, when the lithium iron battery is in a charging state, calculate the second average voltage based on N lithium batteries and the difference between the battery voltage of each lithium battery and the second average voltage, and judge whether the nth lithium battery is in a positive charging speed state, a negative charging speed state or a normal charging state according to the difference between the battery voltage of the nth lithium battery and the second average voltage, where n is a positive integer less than or equal to N, and N is a positive integer;

[0124] S322, when the lithium iron battery is in the standby state, judging whether the nth lithium battery is in the early discharge termination state, the delayed discharge termination state or the normal standby state according to the battery voltage of the nth lithium battery;

[0125] S33, according to S321, when the nth lithium battery cell is in a positive charging speed state, adjusting the lithium iron battery control device so that the adjustable resistor is connected in parallel with the nth lithium battery cell, and using the third control function to calculate and set the resistance value of the adjustable resistor;

[0126] S34, according to S321 and S322, when the nth lithium battery cell is in a negative charging speed state or an early discharge termination state, adjusting the lithium iron battery control device so that the adjustable voltage and current device is connected in parallel with the nth lithium battery cell, and using the fourth control function to calculate and set the voltage and current values ​​of the adjustable current and voltage device;

[0127] S35. According to S322, when the nth lithium battery cell is in a discharge termination delay state, adjusting the lithium iron battery control device so that the adjustable resistor is connected in series with the nth lithium battery cell, and using the fifth control function to calculate and set the resistance value of the adjustable resistor;

[0128] S36, repeat S31 to S35 until the nth lithium battery cell is in a normal charging state according to S321, or the nth lithium battery cell is in a normal standby state according to S322.

[0129] For the above step S31, no matter the lithium iron battery is in a charging state or a standby state, the cell voltage of each lithium battery cell needs to be measured. It should be noted that each time the step S1 is repeated, each lithium battery cell of the lithium iron battery is measured based on the state that the adjustable resistor is not connected, the adjustable voltage and current meter is not connected, and the adjustable resistor and the adjustable voltage and current meter are not connected at the same time.

[0130] The above steps S321 and S322 are parallel steps, indicating that the embodiment of the present invention processes the situation that the iron-lithium battery is in a charging state or in a standby state, and these two iron-lithium batteries do not supply power to the communication load.

[0131] Wherein, step S321 is used to determine whether the nth lithium battery cell is in any one of a positive charging speed state, a negative charging speed state or a normal charging state. In one embodiment, the implementation steps include:

[0132] S3211: If the difference between the cell voltage of the nth lithium battery cell and the second average voltage is greater than 0 and greater than the first power usage threshold, and the cell voltage of the nth lithium battery cell is higher than the cell voltages of the remaining lithium batteries, then the nth lithium battery cell is in a positive charging speed state;

[0133] S3212: If the difference between the cell voltage of the nth lithium battery cell and the second average voltage is less than 0, and the absolute value of the difference between the cell voltage of the nth lithium battery cell and the second average voltage is greater than the first power usage threshold, and the cell voltage of the nth lithium battery cell is lower than the cell voltages of the remaining lithium batteries, then the nth lithium battery cell is in a negative charging speed state;

[0134] S3213. If the difference between the cell voltage of the nth lithium battery cell and the second average voltage is greater than 0 and is less than or equal to the first power usage threshold, or the difference between the cell voltage of the nth lithium battery cell and the second average voltage is less than 0, and the absolute value of the difference between the cell voltage of the nth lithium battery cell and the second average voltage is less than or equal to the first power usage threshold, then the nth lithium battery cell is in a normal charging state.

[0135] Wherein, step S322 is used to determine whether the nth lithium battery cell is in any one of the early discharge termination state, the delayed discharge termination state or the normal standby state. In one embodiment, the implementation steps include:

[0136] S3221: If the cell voltage of the nth lithium battery cell is greater than the second power usage threshold, and the cell voltage of the nth lithium battery cell is greater than the cell voltages of the remaining lithium batteries, the nth lithium battery cell is in a discharge termination delay state;

[0137] S3222: If the cell voltage of the nth lithium battery cell is less than the third power usage threshold, and the cell voltage of the nth lithium battery cell is less than the cell voltages of the remaining lithium batteries, the nth lithium battery cell is in an early discharge termination state;

[0138] S3223: If the cell voltage of the nth lithium battery cell is greater than or equal to the third power usage threshold and less than or equal to the second power usage threshold, the nth lithium battery cell is in a normal standby state.

[0139] In the above steps, the first power usage threshold is 0.1, and the second power usage threshold and the third power usage threshold are set according to the discharge termination voltage and the first power usage threshold. Exemplarily, when the discharge termination voltage is 3.55V, the second power usage threshold is 3.65, and the third power usage threshold is 3.45.

[0140] For the above step S33, it is determined according to the results of step S321 and step S322 that the iron-lithium battery is in a charging state, and when a certain lithium battery cell is in a positive charging state, processing is performed. Among them, the iron-lithium battery is in a charging state, and a certain lithium battery cell is in a positive charging state, indicating that the voltage of this lithium battery cell is increasing at a faster rate. According to the above step S33, the embodiment of the present invention shunts the nth lithium battery cell through a parallel adjustable resistor, and the first control function is used to select the current size to be shunted by the adjustable resistor according to the current passing through the iron-lithium battery before the parallel adjustable resistor.

[0141] In one embodiment, step S33 uses the first control function to calculate the resistance value of the adjustable resistor, including:

[0142] S331, obtaining the current of the lithium iron battery collected by the lithium iron battery current collection module before the parallel adjustable resistor is connected;

[0143] S332, predicting the current passing through the adjustable resistor after the parallel-connected adjustable resistor according to the current passing through the lithium iron battery before the parallel-connected adjustable resistor;

[0144] S333, substituting the difference between the cell voltage of the nth lithium battery cell and the second average voltage, and the current passing through the adjustable resistor after the adjustable resistor is connected in parallel, into the first control function to calculate the resistance value of the adjustable resistor.

[0145] The detailed implementation of the above step S332 includes:

[0146] When the current through the lithium iron battery before the parallel adjustable resistor is greater than or equal to X, the current through the adjustable resistor after the parallel adjustable resistor is the difference between X+a and the current through the lithium iron battery before the parallel adjustable resistor is connected;

[0147] When the current through the lithium iron battery before the parallel connection of the adjustable resistor is greater than or equal to Xa, and less than X, the current through the adjustable resistor after the parallel connection of the adjustable resistor is the difference between X and the current through the lithium iron battery before the parallel connection of the adjustable resistor;

[0148] When the current through the lithium iron battery before the parallel-connected adjustable resistor is greater than or equal to X-2a, and less than Xa, the current through the adjustable resistor after the parallel-connected adjustable resistor is the difference between Xa and the current through the lithium iron battery before the parallel-connected adjustable resistor;

[0149] When the current passing through the lithium iron battery before the parallel adjustable resistor is less than X-2a, the current passing through the adjustable resistor after the parallel adjustable resistor is the difference between X-2a and the current passing through the lithium iron battery before the parallel adjustable resistor.

[0150] Exemplarily, IN is used to represent the current flowing through the lithium iron battery before the adjustable resistor is connected in parallel, and In is used to represent the current flowing through the adjustable resistor after the adjustable resistor is connected in parallel. The above steps are expressed by the formula:

[0151] In=X+a-IN,IN≥X;

[0152] In=X-IN,Xa≤IN <X;

[0153] In=Xa-IN,X-2a≤IN <X-a;

[0154] In=X-2a-IN,IN <X-2a;

[0155] In a preferred implementation, X=15, a=5.

[0156] In the above step S333, the formula of the first control function is:

[0157] Rt = ROUND(Rn*10);

[0158] Rn=VM / In;

[0159] Among them, Rt is the number of switches that turn on the adjustable resistor, turning on the switch of one adjustable resistor means that the resistance value of the adjustable resistor increases by 0.1 ohms, Rn is the resistance value of the adjustable resistor, VM is the difference between the cell voltage of the nth lithium battery cell and the second average voltage, In is the current passing through the adjustable resistor after the adjustable resistor is connected in parallel, and ROUND means rounding the number.

[0160] It should be noted that the execution cycle of step S33 is:

[0161] After the nth lithium battery cell is connected in parallel with the adjustable resistor, a target voltage across the nth lithium battery cell is measured, and an average voltage C is calculated based on the target voltage and the cell voltages of the remaining lithium batteries measured in S31, as well as a difference between the target voltage and the average voltage C;

[0162] If the difference between the target voltage and the average voltage C is less than 0.3, the first positive switch, the second positive switch, the first negative switch, the second negative switch and the N+1 array switches of the adjustable resistor are adjusted to end the connection between the adjustable resistor and the nth lithium battery cell; if the difference between the target voltage and the average voltage C is greater than or equal to 0.3, the connection between the adjustable resistor and the nth lithium battery cell is maintained.

[0163] For the above step S34, it determines that the iron-lithium battery is in a charging state and a certain lithium battery cell is in a negative charging speed state, or determines that the iron-lithium battery is in a standby state and a certain lithium battery is in an early discharge termination state according to the results of steps S321 and S322. The former indicates that the charging speed of this lithium battery cell is slow, and the latter indicates that the discharge speed of this lithium battery cell is fast. According to the above step S34, the embodiment of the present invention increases the charging power of the iron-lithium battery in a charging state and the lithium battery cell in a negative charging speed state by connecting an adjustable voltage and current device in parallel, thereby increasing the charging speed; and can also replenish the power of the iron-lithium battery in a standby state and the iron-lithium battery cell in an early discharge termination state, thereby slowing down the discharge speed of the nth lithium battery cell.

[0164] In step S34, the voltage value of the adjustable voltage and current source is calculated using the second control function, including:

[0165] S341, subtracting the cell voltage of the nth lithium battery cell from the second average voltage to obtain a standby voltage value;

[0166] S342, recording the average value of the sampled voltage at every preset time interval;

[0167] S343, output the voltage value of the adjustable voltage and current device according to the average values ​​of multiple sampled voltages recorded within multiple preset times and the standby voltage value, the formula is:

[0168] Vε=Vα+(M 1 +M 2 +...+M 20 ) / 20

[0169] Among them, M 1 is the average value of the sampled voltage recorded within the first preset time, M 2 is the average value of the sampled voltage recorded within the second preset time, M 20 is the average value of the sampled voltage recorded within the twentieth preset time, Vε is the voltage value of the adjustable voltage and current device obtained using the second control function, and Vα is the standby voltage value.

[0170] In step S34, the current value of the adjustable voltage and current meter is calculated using the second control function, including:

[0171] S344, recording the average value of the sampled current at each preset time interval;

[0172] S345, calculating the standby current value according to the average value of multiple sampled currents recorded within multiple preset time periods:

[0173] S346, outputting the current value of the adjustable voltage and current device according to the standby current value and the voltage value of the adjustable voltage and current device;

[0174] The standby current value is calculated based on the average value of multiple sampled currents recorded within multiple preset time periods, and the formula is:

[0175] IN=(I△t 1 +I△t 2 +...+I△t 20 ) / 20;

[0176] Among them, IN is the standby current value, △t 1 is the first minute within 20 minutes, △t 2 is the second minute within 20 minutes, △t 20 The twentieth minute within 20 minutes.

[0177] Wherein, according to the standby current value and the voltage value of the adjustable voltage and current device, the current value of the adjustable voltage and current device is output, including:

[0178] If the standby current value is less than the first standard current, the voltage value of the adjustable voltage and current device is calculated by dividing the voltage value of the adjustable voltage and current device by the first preset current value of the first resistance value; and when the first preset current value is less than or equal to the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=3; when the first preset current value is greater than the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=Vε / R1+3;

[0179] If the standby current value is greater than or equal to the first standard current and less than the second standard current, the voltage value of the adjustable voltage and current device is divided by the second preset current value of the second resistance value; and when the second preset current value is less than or equal to the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=5+IN / 30; when the second preset current value is greater than the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=Vε / R1+IN / 15;

[0180] If the standby current value is greater than or equal to the second standard current and less than the third standard current, the voltage value of the adjustable voltage and current device is calculated by dividing the third preset current value of the third resistance value; and when the third preset current value is less than or equal to the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=7+IN / 30; when the third preset current value is greater than the target value, the calculation formula of the current value of the adjustable voltage and current device is: Iε=Vε / R2+IN / 30;

[0181] If the standby current value is greater than or equal to the third standard current, the calculation formula of the current value of the adjustable voltage current meter is: Iε=8+IN / 50;

[0182] Wherein, Iε is the current value of the adjustable voltage and current device, Vε is the voltage value of the adjustable voltage and current device, IN is the standby current value, R1 is the first resistance value, and R2 is the second resistance value.

[0183] It should be noted that the execution cycle of step S34 is:

[0184] After the nth lithium battery cell adjustable voltage and current device is connected in parallel, the target voltage across the nth lithium battery cell is measured, and the average voltage D is calculated based on the target voltage and the cell voltages of the remaining lithium batteries measured in S31, as well as the difference between the target voltage and the average voltage D;

[0185] If the difference between the target voltage and the average voltage D is greater than 0 and less than 0.3, the first positive switch, the second positive switch, the first negative switch, the second negative switch and the N+1 array switches of the adjustable voltage and current device are adjusted to terminate the connection relationship between the adjustable voltage and current device and the nth lithium battery cell; if the difference between the target voltage and the average voltage D is less than or equal to 0, the connection relationship between the adjustable voltage and current device and the nth lithium battery cell is maintained;

[0186] For the above step S35, it processes the result of step S322 when it is determined that the iron-lithium battery is in a standby state and a certain lithium battery cell is in a discharge termination delay state. Among them, the iron-lithium battery is in a standby state and a certain lithium battery cell is in a discharge termination delay state, which means that the current discharge speed of this lithium battery cell is slow and the remaining capacity is large. According to the above step S35, the embodiment of the present invention controls an adjustable resistor to form a series circuit with the nth lithium battery cell, so that the nth lithium battery cell can discharge and reduce the voltage based on the adjustable resistor, increase the discharge speed of the nth lithium battery cell, and finally make the lithium battery cells stop discharging at the same time, avoiding a series of problems such as capacity loss, life loss, internal resistance increase and safety risks that may be caused by the different discharge stop times of each lithium battery cell.

[0187] In step S35, the resistance value of the adjustable resistor is calculated using the third control function, including:

[0188] S351, calculating the difference between the cell voltage of the nth lithium battery cell and the discharge termination voltage;

[0189] S352, substituting the difference between the cell voltage of the nth lithium cell and the discharge termination voltage into the third control function to calculate the resistance value of the adjustable resistor, the formula is:

[0190] Rt = ROUND(Rn*10);

[0191] Rn=VM' / 5;

[0192] Wherein, Rt is the number of switches that open the adjustable resistor, and opening a switch of the adjustable resistor means that the resistance value of the adjustable resistor increases by 0.1 ohm, Rn is the resistance value of the adjustable resistor, and VM' is the difference between the cell voltage of the nth lithium battery cell and the discharge termination voltage.

[0193] It should be noted that the execution cycle of step S35 is:

[0194] Measuring the target voltage of the nth lithium battery cell after the nth lithium battery cell is connected in series with the adjustable resistor;

[0195] If the target voltage is less than or equal to the second power usage threshold, such as 3.65, the first positive switch, the second positive switch, the first negative switch, the second negative switch and the N+1 array switches of the adjustable resistor are adjusted to terminate the connection relationship between the adjustable resistor and the nth lithium battery cell; if the target voltage is greater than the second power usage threshold, such as 3.65, the connection relationship between the adjustable resistor and the nth lithium battery cell is maintained;

[0196] Regarding the above step S36, it should be noted that each time S31 to S35 are repeated, the premise is that the state of the iron-lithium battery does not change. Figure 2 and Figure 3 As shown, the embodiment of the present invention respectively shows the application process of step S31 to step S36 for the charging state and the standby state of the iron-lithium battery. Figure 2 For the application process in which the iron-lithium battery is in a charging state, S31 is executed for the first time, and it is found that the iron-lithium battery is in a charging state. Then only the contents of steps S321, S33 and S34 are executed this time. After step S36, S31 is executed again. At this time, the iron-lithium battery is still in a charging state, and it will not jump to the judgment that the iron-lithium battery is in a standby state. Therefore, the contents of steps S321, S33 and S34 continue to be executed until, in the judgment of step S321, the nth lithium battery cell is in a normal charging state. Figure 3 For the application process in which the iron-lithium battery is in standby state, S31 is executed for the first time, and it is found that the iron-lithium battery is in standby state. Then only the contents of steps S322, S34 and S35 are executed this time. After step S36, S31 is executed again. At this time, the iron-lithium battery is still in standby state, and it will not jump to the judgment that the iron-lithium battery is in charging state. Therefore, the contents of steps S322, S34 and S35 continue to be executed until, in the judgment of step S322, the nth lithium battery cell is in normal standby state.

[0197] According to the above steps S31 to S36, the embodiment of the present invention executes the control method based on the iron-lithium battery through the iron-lithium battery control device, and processes according to the charging state and the standby state of the iron-lithium battery, respectively, wherein, when the iron-lithium battery is in the charging state, a connection relationship between the adjustable resistor and the lithium battery cell with a positive charging speed is established to reduce its voltage increase speed, and a connection relationship between the adjustable voltage current source and the lithium battery cell with a negative charging speed state is established to increase its voltage increase speed; when the iron-lithium battery is in the standby state, a connection relationship between the adjustable resistor and the lithium battery cell with a discharge termination delay state is established. The connection relationship is established to speed up its discharge speed, and the connection relationship between the adjustable voltage and current device and the lithium battery cell in the early discharge termination state is established to slow down its discharge speed; multiple adjustments are made to make all the lithium batteries of the iron-lithium battery in a normal charging state when in a charging state, and in a normal standby state when in a standby state, so as to achieve convergent adjustment of the performance of each lithium battery cell and avoid the inconsistency of each lithium battery cell affecting the performance and life of the entire iron-lithium battery when the iron-lithium battery does not form a loop with the communication load and does not need to power the communication load.

[0198] For example, based on Figure 2 The above-mentioned adjustment of the lithium iron battery control device so that the adjustable resistor is connected in series with the nth lithium battery cell is to adjust the third positive switch, the fourth positive switch, the third negative switch, and the fourth negative switch of the adjustable resistor so that the adjustable resistor is connected in series with the nth lithium battery cell, including:

[0199] If the serial number of the nth lithium battery cell is an odd number, the third positive switch and the fourth negative switch are controlled to be closed, and the resistance value of the adjustable resistor is adjusted to a maximum resistance value;

[0200] After adjusting to the maximum resistance value, the first array switch and the fourth array switch are controlled to be closed, and it is detected whether the first multiple connection line is positive and the second multiple connection line is negative. If so, the first array switch and the fourth array switch are controlled to be opened, and the 2n-1 array switch and the 2n array switch are controlled to be closed; it is detected again whether the first multiple connection line is positive and the second multiple connection line is negative. If so, the 2n-1 array switch and the 2n array switch are kept closed, so that the adjustable resistor is connected in series with the nth lithium battery cell;

[0201] If the serial number of the nth lithium battery cell is an even number, the fourth positive switch and the third negative switch are controlled to be closed, and the resistance value of the adjustable resistor is adjusted to a maximum resistance value;

[0202] After adjusting to the maximum resistance value, the second array switch and the third array switch are controlled to be closed, and it is detected whether the first multiple connection line is the negative pole and the second multiple connection line is the positive pole. If so, the second array switch and the third array switch are controlled to be opened, and the 2nth array switch and the 2n+1th array switch are controlled to be closed; it is detected again whether the first multiple connection line is the negative pole and the second multiple connection line is the positive pole. If so, the 2nth array switch and the 2n+1th array switch are kept closed, so that the adjustable resistor is connected in series with the nth lithium battery cell;

[0203] The connection between the third positive switch and the fourth positive switch of the adjustable resistor and the array switch is the first complex connection; the connection between the third negative switch and the fourth negative switch of the adjustable resistor and the array switch is the second complex connection.

[0204] For example, based on Figure 2 The above-mentioned adjustment of the lithium iron battery control device so that the adjustable voltage and current device is connected in series with the nth lithium battery cell is to adjust the first positive switch, the second positive switch, the first negative switch, and the second negative switch of the adjustable voltage and current device so that the adjustable voltage and current device is connected in parallel with the nth lithium battery cell, including:

[0205] If the serial number of the nth lithium battery cell is odd, close the first positive switch and the second negative switch, adjust the adjustable resistor to the maximum resistance, and then close the third positive switch and the fourth negative switch to detect

[0206] Whether the first multiple connection line is positive and the second multiple connection line is negative; if so, open the first positive switch and the second negative switch, and control the 2n-1th array switch and the 2nth array switch to be closed, and detect again whether the first multiple connection line is positive and the second multiple connection line is negative; if still, control the first positive switch, the second negative switch, the 2n-1th array switch and the 2nth array switch to be closed, and the third positive switch and the fourth negative switch to be closed, so that the adjustable voltage and current meter is connected in parallel with the nth lithium battery cell;

[0207] If the serial number of the nth lithium battery cell is an even number, the second positive switch and the first negative switch are closed, and the adjustable resistor is adjusted to the maximum resistance value at the same time, and then the third positive switch and the fourth negative switch are closed to detect whether the first multiple connection line is the negative pole and the second multiple connection line is the positive pole; if so, the second positive switch and the first negative switch are opened, and the 2nth array switch and the 2n+1th array switch are controlled to be closed, and it is detected again whether the first multiple connection line is the negative pole and the second multiple connection line is the positive pole; if still, the second positive switch, the first negative switch, the 2nth array switch and the 2n+1th array switch are controlled to be closed, and the third positive switch and the fourth negative switch are kept closed, so that the adjustable voltage and current meter is connected in parallel with the nth lithium battery cell;

[0208] Among them, the connection between the first positive switch, the second positive switch and the array switch of the adjustable voltage and current device is the first complex connection; the connection between the first negative switch, the second negative switch and the array switch of the adjustable voltage and current device is the second complex connection.

[0209] In one embodiment, when the serial number of the nth lithium battery cell is odd, if the condition that the first multiple connection line is the positive pole and the second multiple connection line is the negative pole is not met, a wiring error is reported; when the serial number of the nth lithium battery cell is even, if the condition that the first multiple connection line is the negative pole and the second multiple connection line is the positive pole is not met, a wiring error is reported.

[0210] like Figure 6 As shown, the power distribution time setting unit sets the power supply time according to the energy storage condition of the energy storage power supply, including:

[0211] S41, predicting the battery life of the target energy storage power source, and obtaining the remaining discharge time of the target energy storage power source;

[0212] S42: setting the power supply time of the target energy storage power source according to the remaining discharge time of the target energy storage power source.

[0213] Among them, predicting the battery life of the target energy storage power source and obtaining the remaining discharge time of the target energy storage power source include:

[0214] S411, obtaining the discharge current data of the battery, inputting the current data into the total discharge time prediction model, and outputting the total discharge time of the battery; the total discharge time prediction model is a polynomial model under different currents, and the formula is as follows:

[0215] y=a n x n +a n-1 x n-1 +a n-2 x n-2 …a 1 x+a 0

[0216] Among them, x is the current, y is the total discharge time, and the optimal n value is selected by calculating the residual sum of squares;

[0217] S412, obtaining the discharged time of the battery, and arranging the corresponding current data and the total discharge time into a data set; randomly extracting different data subsets from the data set, and constructing a stacking model, wherein the stacking model includes multiple prediction models; inputting the discharged time, current data and total discharge time of the battery to be tested into the corresponding prediction model to obtain multiple voltage prediction data corresponding to the discharge voltage;

[0218] In step S412, different data subsets are randomly extracted from the data set, and the data set is specifically divided into two data subsets according to the voltage threshold, namely, a first data subset and a second data subset, wherein the discharge voltage of the first data subset is greater than the voltage threshold, and the discharge voltage of the second data subset is less than the voltage threshold, and corresponding prediction models are respectively trained according to the data set, the first data subset, and the second data subset; the voltage prediction data corresponding to the discharge voltage are respectively an upper threshold prediction result, a lower threshold prediction result, and a full data prediction result; and the weight of the data below the voltage threshold is increased;

[0219] S413, inputting multiple voltage prediction data into the stacking model combination to obtain a final prediction result of the discharge voltage; obtaining a discharge curve of the battery according to the final prediction result of the discharge voltage and the discharge time, and predicting the remaining discharge time according to the discharge curve.

[0220] The total discharge duration prediction model of the embodiment of the present invention is as follows: Figure 7 As shown in the figure, the total discharge time and current variation rules in the existing total discharge time prediction model are as follows: Figure 8 As shown; the total discharge time and current variation rules in the total discharge time prediction model of the embodiment of the present invention are as follows Fig. 9 shown.

[0221] For the above step S412, the embodiment of the present invention establishes multiple models through random sampling method, and finally uses the stacking model to combine the results of multiple models, which can solve the problem of model overfitting. Because the discharge data of the battery itself will fluctuate, if a highly complex neural network model is used for training, the trend of the model will be completely consistent with the fluctuation of the discharge data, so the random sampling method is introduced, and multiple models are combined together to average out the fluctuation of the data itself.

[0222] In the above step S412, different data subsets are randomly extracted from the data set, and the data set is specifically divided into two data subsets according to the voltage threshold, namely a first data subset and a second data subset, wherein the discharge voltage of the first data subset is greater than the voltage threshold, and the discharge voltage of the second data subset is less than the voltage threshold (corresponding to Figure 7 The voltage is 1.9V), and the corresponding prediction model is obtained by training the data set, the first data subset and the second data subset respectively; the prediction model is any one of a linear regression model, a tree classification regression model, a logistic regression model and a feedforward neural network regression model. The present embodiment is preferably a feedforward neural network regression model. That is Figure 7 Model 1, Model 2 and Model 3 in are all feedforward neural network regression models.

[0223] The voltage prediction data corresponding to the discharge voltage are respectively the upper threshold prediction results (corresponding to Figure 7Voltage 2), prediction results under threshold (corresponding to Figure 7 Voltage 3) and full data prediction results (corresponding to Figure 7 voltage 1); increase the weight of data below the voltage threshold;

[0224] The construction of a feedforward neural network regression model requires data preprocessing, feature engineering, model selection, and parameter adjustment.

[0225] (1) Data preprocessing

[0226] The input data of the model include current, discharge time, and total discharge time. The total discharge time is taken from the output result of the total discharge time prediction model. This set of features will be used to train the model and fit the predicted voltage value.

[0227] like Fig.10 As shown, the voltage of the discharge curve is erratic at the beginning of discharge, which is not conducive to the curve fitting, and the range of this part of the data is not wide, which does not affect the overall application of the model, so the input data with unstable voltage is deleted. The input data is the data set in step S412, and the input data corresponds to the discharge time, current data and total discharge time.

[0228] (2) Feature Engineering

[0229] The data are all standard numerical data, and no extra data processing is required. However, the data features are relatively few, so feature cross-processing is required in advance to convert low-dimensional features into high-dimensional features to improve the accuracy of the model.

[0230] (3) Model selection

[0231] The feedforward neural network model was finally chosen. The main reasons are: a. Feedforward neural networks are more conducive to processing static data; b. Feedforward neural networks can automatically extract and select features; c. Feedforward neural networks can process more complex data.

[0232] The feedforward neural network is a classic and powerful machine learning model that imitates the process of mutual communication between human neurons. The model consists of an input layer, a hidden layer, and an output layer. The features enter the neural network from the input layer, undergo a series of transformations in the hidden layer, and are finally output from the output layer. Except for the input layer, the neurons in other layers are connected to all neurons in the previous layer. In the process of passing to the next layer, it is necessary to calculate the transfer weight and activation function conversion. The weight can be obtained using optimization algorithms such as batch gradient descent, stochastic gradient descent, and mini-batch gradient descent. The activation function can choose the Sigmoid function:

[0233]

[0234] Tanh function:

[0235]

[0236] ReLU function:

[0237]

[0238] The purpose of the activation function is to convert the original linear output results into nonlinear results, thereby increasing the application scope of the model. In actual applications, due to the different characteristics, data volume, and convergence speed of each set of data, you can flexibly select it according to your needs, or use the activation function as a hyperparameter to flexibly adjust it for the purpose of obtaining the best model effect.

[0239] The gradients related to the bias and weight are calculated through back propagation, and the weight values ​​are adjusted according to the gradients. The bias is minimized in continuous iterations, and the final feedforward neural network model is obtained. The feedforward neural network model process is as follows Fig.11 shown.

[0240] (4) Parameter adjustment

[0241] The premise of adjusting parameters is to find appropriate evaluation indicators. The parameters that need to be adjusted include the number of hidden layers, the number of neurons, the activation function, and the learning rate. The optimal value of the evaluation indicator is the goal, and the best parameter combination is traversed. The model of this solution is a regression model, so the evaluation indicators can be selected from RMSE function and R 2 function;

[0242] RMSE function:

[0243]

[0244] When RMSE is smaller, it means the model fits better;

[0245] R 2 function:

[0246]

[0247] in, When R 2 The closer it is to 1, the better the model fit is.

[0248] For the above step S413, if Fig.11 As shown, multiple voltage prediction data are input into the stacking model combination to obtain the final prediction result of the discharge voltage; the discharge curve of the battery is obtained according to the final prediction result of the discharge voltage and the discharge time, and the remaining discharge time is predicted according to the discharge curve.

[0249] Analyzing the battery life according to the discharge curve in step S413 specifically includes the following steps:

[0250] Sa1. Use the discharge curve of known current to fill in the discharge curves under other currents;

[0251] Sa2. Find the corresponding discharge curve based on the known current battery voltage and discharge time;

[0252] Sa3, according to the maximum discharge time of the discharge curve corresponding to the current minus the discharge time, the remaining discharge time is obtained. The stacking model uses a regression model, which can be flexibly selected according to actual needs, such as xgboost regression model, linear regression model, logistic regression model, etc. To verify the model effect, the 20A prediction result is now intercepted and drawn into a table, such as Fig.12 shown.

[0253] It can be seen that except for the large fluctuations in the initial data, which were not used for model training and resulted in large differences in the results, the data for the remaining time periods basically overlapped and could meet the requirements of model application.

[0254] Wherein, in step S42, setting the power supply time of the target energy storage power source according to the remaining discharge time of the target energy storage power source includes:

[0255] S421, obtaining multiple peak power consumption periods of base station equipment;

[0256] S422: If the remaining discharge time of the target energy storage power source covers one of the peak power consumption periods, then the power supply time of the target energy storage power source is set to the covered peak power consumption period.

[0257] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A base station energy consumption control system, characterized in that: include: A base station energy consumption control edge gateway, a base station environmental energy consumption control module, a base station transmitting unit hard shutdown module and an energy storage distribution module that are communicatively connected to the base station energy consumption control edge gateway; The base station environmental energy consumption control module includes an air conditioner start-stop control unit and an air conditioner outdoor unit spray control unit; the air conditioner start-stop control unit is used to set the number of air conditioner start-up times and air conditioner start-up time; The air conditioner outdoor unit spray control unit is used to control the spray system to spray the air conditioner outdoor unit; The base station transmitting unit hard shutdown module is used to set the base station transmitting device working time; The energy storage and distribution module includes a power supply state energy storage control unit, a non-power supply state energy storage control unit, and a power distribution time setting unit; the power supply state energy storage control unit is used to adjust the voltage and current values ​​of each lithium battery cell in the energy storage power supply through the iron-lithium battery control device when the energy storage power supply is supplying power; the non-power supply state energy storage control unit is used to adjust the voltage and current values ​​of each lithium battery cell in the energy storage power supply through the iron-lithium battery control device when the energy storage power supply is not supplying power; the power distribution time setting unit is used to set the power supply time according to the energy storage situation of the energy storage power supply.

2. The base station energy consumption control system according to claim 1, characterized in that: The controlled spray system includes a water storage device and a spray device; the water storage device includes a water receiving tray, a condensed water delivery pipe and a water storage tank; the water receiving tray is arranged below the condenser, one end of the condensed water delivery pipe is connected to the water receiving tray, and the other end is connected to the water inlet end of the water storage tank; the spray device includes a water pump and a spray head; the water inlet end of the water pump is connected to the water outlet end of the water storage tank, and the water outlet end of the water pump is connected to the spray head.

3. The base station energy consumption control system according to claim 2, characterized in that: The air conditioner outdoor unit spray control unit implements the following steps: S11, obtaining the outdoor temperature, the condenser fin temperature, the amount of water in the water storage tank and the current time, and calculating the temperature difference between the condenser fin temperature and the outdoor temperature; S12, when the outdoor temperature is greater than the first temperature threshold, the condenser fin temperature is higher than the outdoor temperature by 5°C and the current time is within the first time interval, the high temperature control mode is turned on; when the outdoor temperature is less than or equal to the first temperature threshold and greater than the second temperature threshold, the temperature difference between the condenser fin temperature and the outdoor temperature is greater than 3°C and the current time is within the second time interval, the conventional control mode is turned on; when the outdoor temperature is less than or equal to the second temperature threshold, the temperature difference between the condenser fin temperature and the outdoor temperature is greater than 3°C and the current time is within the second time interval, the low temperature control mode is turned on; the first temperature threshold is greater than the second temperature threshold; S12, generating water spray control parameters according to the adopted control mode and the amount of water in the water tank; S14. Control the spraying device to perform the spraying operation according to the generated water spraying control parameters.

4. The base station energy consumption control system according to claim 1, characterized in that: The iron-lithium battery control device includes: a lithium battery terminal voltage data acquisition module, an iron-lithium battery current acquisition module, a switch array, a control processor, an adjustable voltage and current device, and an adjustable resistor; The iron-lithium battery comprises N lithium cells connected in series; the lithium cell terminal voltage data acquisition module acquires the cell voltage of each lithium cell, the iron-lithium battery current acquisition module acquires the current passing through the iron-lithium battery, the switch array comprises N+1 array switches, the positive electrode of each lithium cell and the negative electrode of each lithium cell are connected to one end of an array switch, wherein one end of the 2n-1th array switch is connected to the positive electrode of a lithium cell, and one end of the 2nth array switch is connected to the negative electrode of the lithium cell; The adjustable voltage and current device includes a first positive switch, a second positive switch, a first negative switch and a second negative switch, wherein the first positive switch is connected to the other end of the 2n-1th array switch, the second positive switch is connected to the other end of the 2n-1th array switch, the first negative switch is connected to the other end of the 2n-1th array switch, and the second negative switch is connected to the other end of the 2n-1th array switch; the adjustable resistor includes a third positive switch, a fourth positive switch, a third negative switch and a fourth negative switch, wherein the third positive switch is connected to the other end of the 2n-1th array switch, the fourth positive switch is connected to the other end of the 2n-2nth array switch, the third negative switch is connected to the other end of the 2n-1th array switch, and the fourth negative switch is connected to the other end of the 2n-2nth array switch; By adjusting the first positive switch, the second positive switch, the first negative switch, the second negative switch of the adjustable voltage and current meter, and the third positive switch, the fourth positive switch, the third negative switch and the fourth negative switch of the adjustable resistor, and N+1 array switches, the nth lithium battery cell is connected in parallel or in series with the adjustable resistor, or the nth lithium battery cell is connected in parallel with the adjustable voltage and current meter, wherein N is a positive integer and n is a positive integer less than or equal to N.

5. The base station energy consumption control system according to claim 4, characterized in that: The power supply state energy storage control unit implements the following steps: S21, measuring the cell voltage of each lithium battery cell; S22, when the lithium iron battery is in a variable current discharge state, a first average voltage based on N lithium batteries and a difference between the battery voltage of each lithium battery and the first average voltage are calculated, and the nth lithium battery is judged to be in a slow power drop state, a fast power drop state or a normal variable current discharge state according to the difference between the battery voltage of the nth lithium battery and the first average voltage, where n is a positive integer less than or equal to N, and N is a positive integer; S23. According to S22, when the nth lithium battery cell is in a state of slow power reduction, the iron-lithium battery control device is adjusted so that the adjustable resistor is connected in series with the nth lithium battery cell, and the resistance value of the adjustable resistor is calculated and set using the first control function; S24, according to S22, when the nth lithium battery cell is in a state of rapid power drop, adjusting the iron-lithium battery control device so that the adjustable voltage and current device is connected in parallel with the nth lithium battery cell, and using the second control function to calculate the current value and voltage value of the adjustable voltage and current device and set them; Each time the iron-lithium battery control device is adjusted in S25 and S23, or each time the iron-lithium battery control device is adjusted in S24, the process returns to S21 until the nth lithium battery cell is in a normal variable current discharge state according to S22, and the control is terminated.

6. The base station energy consumption control system according to claim 4, characterized in that: The non-powered state energy storage control unit implements the following steps: S31, measuring the cell voltage of each lithium battery cell; S321, when the lithium iron battery is in a charging state, calculate the second average voltage based on N lithium batteries and the difference between the battery voltage of each lithium battery and the second average voltage, and judge whether the nth lithium battery is in a positive charging speed state, a negative charging speed state or a normal charging state according to the difference between the battery voltage of the nth lithium battery and the second average voltage, where n is a positive integer less than or equal to N, and N is a positive integer; S322, when the lithium iron battery is in the standby state, judging whether the nth lithium battery is in the early discharge termination state, the delayed discharge termination state or the normal standby state according to the battery voltage of the nth lithium battery; S33, according to S321, when the nth lithium battery cell is in a positive charging speed state, adjusting the lithium iron battery control device so that the adjustable resistor is connected in parallel with the nth lithium battery cell, and using the third control function to calculate and set the resistance value of the adjustable resistor; S34, according to S321 and S322, when the nth lithium battery cell is in a negative charging speed state or an early discharge termination state, adjusting the lithium iron battery control device so that the adjustable voltage and current device is connected in parallel with the nth lithium battery cell, and using the fourth control function to calculate and set the voltage and current values ​​of the adjustable current and voltage device; S35. According to S322, when the nth lithium battery cell is in a discharge termination delay state, adjusting the lithium iron battery control device so that the adjustable resistor is connected in series with the nth lithium battery cell, and using the fifth control function to calculate and set the resistance value of the adjustable resistor; S36, repeat S31 to S35 until the nth lithium battery cell is in a normal charging state according to S321, or the nth lithium battery cell is in a normal standby state according to S322.

7. The base station energy consumption control system according to claim 1, characterized in that: The power distribution time setting unit sets the power supply time according to the energy storage condition of the energy storage power supply, including: S41, predicting the battery life of the target energy storage power source, and obtaining the remaining discharge time of the target energy storage power source; S42: setting the power supply time of the target energy storage power source according to the remaining discharge time of the target energy storage power source.

8. The base station energy consumption control system according to claim 7, characterized in that: Predict the battery life of the target energy storage power source and obtain the remaining discharge time of the target energy storage power source, including: S411, obtaining the discharge current data of the battery, inputting the current data into the total discharge time prediction model, and outputting the total discharge time of the battery; the total discharge time prediction model is a polynomial model under different currents, and the formula is as follows: y=a n x n +a n-1 x n-1 +a n-2 x n-2 …a1x+a0 Among them, x is the current, y is the total discharge time, and the optimal n value is selected by calculating the residual sum of squares; S412, obtaining the discharged time of the battery, and arranging the corresponding current data and the total discharge time into a data set; randomly extracting different data subsets from the data set, and constructing a stacking model, wherein the stacking model includes multiple prediction models; inputting the discharged time, current data and total discharge time of the battery to be tested into the corresponding prediction model to obtain multiple voltage prediction data corresponding to the discharge voltage; In step S412, different data subsets are randomly extracted from the data set, and the data set is specifically divided into two data subsets according to the voltage threshold, namely, a first data subset and a second data subset, wherein the discharge voltage of the first data subset is greater than the voltage threshold, and the discharge voltage of the second data subset is less than the voltage threshold, and corresponding prediction models are respectively trained according to the data set, the first data subset, and the second data subset; the voltage prediction data corresponding to the discharge voltage are respectively an upper threshold prediction result, a lower threshold prediction result, and a full data prediction result; and the weight of the data below the voltage threshold is increased; S413, inputting multiple voltage prediction data into the stacking model combination to obtain a final prediction result of the discharge voltage; obtaining a discharge curve of the battery according to the final prediction result of the discharge voltage and the discharge time, and predicting the remaining discharge time according to the discharge curve.

9. The base station energy consumption control system according to claim 8, characterized in that: Analyzing the battery life according to the discharge curve in step S3 specifically includes the following steps: Use the discharge curve of known current to fill in the discharge curves under other currents; According to the known current battery voltage and discharge time, find the corresponding discharge curve; The remaining discharge time is calculated by subtracting the discharged time from the maximum discharge time of the discharge curve corresponding to the current.

10. The base station energy consumption control system according to claim 7, characterized in that: The target energy storage power supply power supply time is set according to the remaining discharge time of the target energy storage power supply, including: S421, obtaining multiple peak power consumption periods of base station equipment; S422: If the remaining discharge time of the target energy storage power source covers one of the peak power consumption periods, then the power supply time of the target energy storage power source is set to the covered peak power consumption period.

Images