Self-adaptive activation method and device for backup power supply of power distribution terminal

Abstract

The invention relates to the technical field of distribution network automation, in particular to a self-adaptive activation method and device for a backup power supply of a power distribution terminal. When leaving a factory, the DC / DC activation module measures the initial internal resistance and the initial capacity of each backup power supply battery; a detection period is set at intervals, if the current backup power supply battery is in a floating charge state, the power supply module controls the DC / DC activation module to measure the internal resistance of the battery and send the internal resistance to the power distribution terminal; the power distribution terminal judges whether the internal resistance of the current backup power supply battery is greater than 1.3 times of the initial resistance of the current backup power supply battery, if so, the power supply module controls a DC / DC activation module to activate the current backup power supply battery, and sends the capacity of the activated current backup power supply battery measured by the DC / DC activation module to the power distribution terminal; and the power distribution terminal updates the residual capacity percentage of the back-up power supply battery and judges whether the residual capacity percentage is smaller than 80%, and if yes, an aging alarm of the current back-up power supply battery is given out. According to the invention, activation control and capacity monitoring of each single battery can be completed.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network automation, and in particular to a method and device for adaptively activating a backup power supply of a distribution terminal. Background Art

[0002] A distribution terminal refers to a terminal device in a power system used to collect information about distribution equipment operation faults and to perform control. It is also called a distribution board or distribution cabinet. Currently, a large number of distribution terminals (including station terminals DTU, feeder terminals FTU, etc.) use lead-acid batteries as standard backup power supplies and voltage transformers PT as the main power supply. The battery is in a floating charge state for a long time. If the charge and discharge management is not performed for a long time, the chemical reaction inside the battery may be incomplete, thus affecting its capacity and service life. Therefore, the distribution terminal is usually equipped with a power module, which has the function of activating the battery.

[0003] The current activation methods for distribution terminals are divided into three methods: on-site activation, remote control activation, and automatic activation with preset activation cycles and discharge duration parameters. On-site activation refers to the operation and maintenance personnel directly controlling the equipment to activate the battery through manual intervention on site. Remote control activation refers to the activation of distribution terminals distributed in different locations through remote operation or remote monitoring systems. Automatic activation with preset activation cycles and discharge duration parameters means automatically starting the battery activation process by setting fixed activation cycles and discharge durations. In this mode, the battery activation process does not require manual intervention by the operation and maintenance personnel, and the system automatically executes according to pre-set rules, usually based on fixed cycles and parameters (such as discharge depth, current size, activation time, etc.). Automatic activation with preset activation cycles and discharge duration parameters reduces manual operations and improves operation and maintenance efficiency by setting predetermined activation cycles and parameters.

[0004] However, the existing automatic activation function relies on preset cycles and parameters. If there is a lack of clear operating instructions or training instructions, it may be difficult for operation and maintenance personnel to understand how to adjust these preset parameters to adapt to the needs of the battery. In addition, the preset activation cycle and discharge duration are usually based on the assumption that all batteries have the same (or nearly the same) health status. In fact, each battery in the battery pack has a different health status (such as capacity, internal resistance, number of charge and discharge cycles, etc.). The lack of capacity monitoring and activation functions for battery cells leads to an unbalanced activation process, low efficiency, and may even cause damage to some batteries. In addition, there is a lack of closed-loop linkage between the current battery activation operation and capacity detection, resulting in the inability to automatically adjust the parameters (such as activation current, discharge depth, etc.) during the activation process according to the battery status. In the automated activation system, the preset cycle and discharge duration are fixed parameter settings. If there is no feedback and optimization mechanism combined with the capacity monitoring results, the control of the activation current may be inaccurate and the activation effect is difficult to evaluate. These shortcomings have led to the low practicality of the current distribution terminal backup power activation function, most of which are in a long-term idle state, and the aging of the distribution terminal backup power supply has intensified, seriously affecting the safe and reliable operation of the distribution terminal. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the defects of the existing automatic activation method, which lacks guidance, making it difficult for equipment operation and maintenance personnel to use, lacks monitoring and dynamic adjustment of the health status of battery cells, and battery capacity detection is not closed-loop controlled with the activation operation.

[0006] In order to solve the above technical problems, the present invention provides a method for adaptively activating a backup power supply of a power distribution terminal, comprising:

[0007] When the main power supply is in operation, the main power supply supplies power to the power module through the main power supply circuit; the power distribution terminal controls the relay switching module to close the backup power supply circuit between the power module and the backup power battery pack, so that the power module supplies power to the backup power battery pack; the battery pack activation circuit between the DC / DC activation module in the power module and the backup power battery combination is in the off state;

[0008] When the main power supply is in operation, based on the detection cycle set by the power distribution terminal, when the status of each backup power supply battery is detected, the power distribution terminal controls the relay switching module to close the battery pack activation circuit and shut down the backup power supply circuit. The backup power supply battery pack activation process includes:

[0009] Step S1: When leaving the factory, the DC / DC activation module in the power distribution terminal control power module measures the initial internal resistance and initial capacity of each backup power battery;

[0010] Step S2: The power distribution terminal sets the detection cycle at intervals, controls the power module to detect the status of each backup power battery, and if the current backup power battery is in a floating charge state, the power module controls the DC / DC activation module to measure the internal resistance of the current backup power battery and sends it to the power distribution terminal;

[0011] Step S3: judging whether the internal resistance of the current backup power supply battery is greater than a preset multiple of its initial resistance through the power distribution terminal, if so, proceeding to step S4, otherwise returning to step S2;

[0012] Step S4: the power module controls the DC / DC activation module to activate the current backup power battery, and sends the capacity of the current backup power battery after activation measured by the DC / DC activation module to the power distribution terminal;

[0013] Step S5: Based on the capacity of the current backup power battery after activation and its initial capacity, the power distribution terminal updates the remaining capacity percentage of the backup power battery, and determines whether the remaining capacity percentage of the current backup power battery is less than the preset percentage. If so, an aging alarm of the current backup power battery is issued, otherwise, the detection period is reduced and the process returns to step S2;

[0014] During the activation process of the backup power battery pack, if the power module detects that the main power supply is in a missing state, the distribution terminal controls the relay switching module through the interrupt service program to shut down the battery pack activation circuit, close the backup power supply circuit, and supply power to the power module through the backup power battery pack; after the main power supply is restored, the backup power supply circuit is kept closed until the set detection cycle is reached, then the backup power supply circuit is shut down and the battery pack activation circuit is closed.

[0015] Preferably, the DC / DC activation module completes battery discharge and charging for each backup power battery through the intermittent charging curve of I0, and calculates the capacity of each backup power battery, including:

[0016] When the current backup power supply battery is fully charged, I0 is used to discharge the current backup power supply battery until the voltage of the current backup power supply battery reaches the fully discharged voltage, and the fully discharged time of the current backup power supply battery is obtained, wherein I0 is the activation current;

[0017] After the battery is fully discharged, at a first preset time interval, the battery is charged to a full-charge voltage using I0 to obtain a first full-charge time of the current backup power supply battery;

[0018] After obtaining the first full charge time of the current backup power battery, the first preset time is passed and the Charge the battery to the full-charge voltage to obtain the second full-charge time of the current backup power battery;

[0019] After obtaining the second fully charged time of the current backup power battery, with an interval of the first preset time, use to charge the battery to the full charge voltage to obtain the third fully charged time of the current backup power battery;

[0020] Based on I0, the fully discharged time, the first fully charged time, the second fully charged time, and the third fully charged time of each backup power battery, calculate the capacity of each backup power battery.

[0021] Preferably, based on I0, the fully discharged time, the first fully charged time, the second fully charged time, and the third fully charged time of the current backup power battery, calculate the capacity of the current backup power battery. The calculation formula is:

[0022]

[0023] where Q is the capacity of the current backup power battery, I0 is the activation current, t2 = t1 + Δt, t1 is the fully discharged time of the current backup power battery, Δt is the first preset time, t3 is the first fully charged time of the current backup power battery, t4 = t3 + Δt, t5 is the second fully charged time of the current backup power battery, t6 = t5 + Δt, t7 is the third fully charged time of the current backup power battery, and i(τ) is the instantaneous current at time τ.

[0024] Preferably, the DC / DC activation module makes I0 = I A , and completes battery discharge and charging for each backup power battery through the intermittent charging curve of I0. Calculate the initial capacity of each backup power battery, where I A is the nominal current at a preset multiple.

[0025] Preferably, the DC / DC activation module performs activation processing on the current backup power battery, including:

[0026] Step S41: Set I0 = I A , set the maximum number of cycles as N, set the second preset time, set the number of activation times, and the current cycle number n = 1;

[0027] Step S42: Complete battery discharge and charging for the current backup power battery according to the intermittent charging curve of I0, and calculate the capacity of the current backup power battery in the nth cycle, n = n + 1;

[0028] Step S43: If n < N, with an interval of the second preset time, set I0 to a value within a preset range centered on I A , and return to Step S42; if n = N, stop the current cycle, and select the I0 corresponding to the maximum battery capacity from the historical cycles, and repeat Step S42 until the number of activation times is reached.

[0029] Preferably, measuring the internal resistance of each backup power battery by a DC / DC activation module includes:

[0030] In each backup power battery floating charge state, use I A Discharge each backup power battery and measure the voltage drop of each backup power battery at the moment of discharge; where I A The nominal current of the preset ratio

[0031] Based on the preset magnification and the voltage drop of each backup power battery, the internal resistance of each backup power battery is calculated.

[0032] Preferably, the calculation formula of the internal resistance of each backup power battery is:

[0033]

[0034] Among them, R i is the internal resistance of the ith backup power battery, ΔU i is the voltage drop of the ith backup power battery, I A It is the nominal current of the preset multiplier.

[0035] Preferably, based on the capacity of the current backup power battery after activation and its initial capacity, the power distribution terminal updates the remaining capacity percentage of the backup power battery, and the formula is:

[0036]

[0037] Among them, Q s is the remaining capacity percentage of the backup power battery after update, Q is the capacity of the current backup power battery after activation, and Q0 is the initial capacity of the current backup power battery.

[0038] The present invention also provides a device for adaptively activating a backup power supply of a power distribution terminal, which is used to implement the above-mentioned method for adaptively activating a backup power supply of a power distribution terminal, comprising:

[0039] Power module:

[0040] Its output end is connected to the input end of the power distribution terminal, used to provide power to the power distribution terminal, and is connected to the power distribution terminal for communication;

[0041] Its output end is connected to the input end of the relay switching module to provide electrical energy to the relay switching module;

[0042] Its input end is connected to the output end of the main power supply through the main power supply circuit, and is used to receive the electric energy of the main power supply, monitor the status of the main power supply and send it to the power distribution terminal;

[0043] Its input end is connected to the output end of the backup power battery pack through the backup power supply circuit, and is used to receive the electric energy of the backup power battery pack when the main power supply is in the missing state; its output end is connected to the input end of the backup power battery pack through the backup power supply circuit, and is used to provide electric energy to the backup power battery pack when the main power supply resumes operation, and sets the detection cycle at intervals, receives the control command of the power distribution terminal, monitors the status of the backup power battery pack and sends it to the power distribution terminal;

[0044] Its DC / DC activation module is connected to the backup power battery pack through a battery pack activation circuit, and is used to receive a measurement instruction sent by a distribution terminal, and measure the internal resistance of each backup power battery in the backup power battery pack; receive the activation instruction sent by the distribution terminal, activate the backup power battery in the backup power battery pack whose internal resistance is greater than a preset multiple of its initial resistance, and measure the capacity of the activated backup power battery and return it to the distribution terminal, so that the distribution terminal can issue a backup power battery aging alarm when the percentage of the remaining capacity of the backup battery pack is less than a preset percentage, otherwise when the battery pack activation circuit is closed, shorten the set detection period;

[0045] A relay switching module, whose output end is connected to the input end of the backup power battery pack, and whose input end is connected to the battery pack activation circuit and the backup power supply circuit. It is connected to the distribution terminal for communication and is used to receive a switching instruction sent by the interrupt service program of the distribution terminal. When the main power supply is in operation, the backup power supply circuit is closed and the battery pack activation circuit is in an off state. When the main power supply is in operation, a detection cycle is set based on the distribution terminal. When the status of each backup power battery is detected, the battery pack activation circuit is closed and the backup power supply circuit is turned off. During the battery pack activation process, if the main power supply is in a missing state, the battery pack activation circuit is turned off and the backup power supply circuit is closed. After the main power supply is restored, the backup power supply circuit is kept closed until the set detection cycle is reached, the backup power supply circuit is turned off, and the battery pack activation circuit is closed.

[0046] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0047] The invention discloses a method and device for adaptively activating a backup power supply for a power distribution terminal. By accurately measuring the initial internal resistance and capacity of each backup power supply battery at the factory, a clear reference value is provided, so that subsequent health status monitoring can be more accurate. By setting the detection cycle at intervals and regularly detecting the change in the internal resistance of each backup power supply battery, the health status of each backup power supply battery can be dynamically grasped. When the internal resistance of the current backup power supply battery exceeds the preset multiple, the activation process is automatically started to prevent the system failure caused by the battery performance degradation. This dynamic monitoring and activation mechanism can effectively extend the battery life and reduce maintenance costs. The DC / DC activation module activates the current backup power supply battery and can measure the capacity of the current backup power supply battery after activation, realizing closed-loop control of battery capacity detection and activation operation. If the remaining capacity percentage of the current backup power supply battery is less than 80%, an aging alarm of the current backup power supply battery is issued. Through automated battery health detection, activation and capacity measurement, the need for manual intervention is greatly reduced. Operation and maintenance personnel can focus more on other management tasks of the system, reduce the risk of human error, and improve operation and maintenance efficiency and work safety.

[0048] In addition, the DC / DC activation module completes the battery discharge and charging of each backup power battery through the intermittent charging curve of I0, and calculates the capacity of each backup power battery. Conventional battery activation processing usually adopts a fixed charging current, which lacks dynamic adjustment according to the actual condition of the battery. The present invention calculates and adjusts the activation current I0 according to the real-time capacity of the battery after each cycle, and the activation current I0 will be adjusted at I0. A Fine-tuning is performed within a preset range of the center. This dynamic adjustment can optimize the charging process according to the health status of the battery and improve the battery activation effect. Different from the traditional solution that adopts a single fixed time interval and a fixed current for charging and discharging, the intermittent charging curve of I0 proposed in the present invention is used to complete the battery discharge and charging for each backup power supply battery. By setting a second preset time for adjusting the interval time and combining the intermittent charging curve, the charging cycle and current amplitude can be controlled more accurately, thereby reducing damage to the battery and increasing the possibility of battery capacity recovery, so that the battery capacity activation effect is better and the activation cycle time can be compressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0050] Figure 1 The present invention is a flow chart of a method for adaptively activating a backup power supply of a power distribution terminal.

[0051] Figure 2 It is a schematic diagram of the intermittent charging curve of I0.

[0052] Figure 3 It is a schematic diagram of a self-adaptive activation device for a backup power supply of a power distribution terminal according to the present invention. DETAILED DESCRIPTION

[0053] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0054] like Figure 1 As shown, Figure 1 The present invention is a flow chart of a method for adaptively activating a backup power supply for a power distribution terminal.

[0055] Embodiment 1 of the present invention provides a method for adaptively activating a backup power supply of a power distribution terminal, comprising:

[0056] When the main power supply is in operation, the main power supply supplies power to the power module through the main power supply circuit; the power distribution terminal controls the relay switching module to close the backup power supply circuit between the power module and the backup power battery pack, so that the power module supplies power to the backup power battery pack; the battery pack activation circuit between the DC / DC activation module in the power module and the backup power battery combination is in the off state;

[0057] When the main power supply is in operation, based on the detection cycle set by the power distribution terminal, when the status of each backup power supply battery is detected, the power distribution terminal controls the relay switching module to close the battery pack activation circuit and shut down the backup power supply circuit. The backup power supply battery pack activation process includes:

[0058] Step S1: When leaving the factory, the DC / DC activation module in the power distribution terminal control power module measures the initial internal resistance and initial capacity of each backup power battery;

[0059] In this embodiment, preferably, measuring the internal resistance of each backup power supply battery by a DC / DC activation module includes:

[0060] In each backup power battery floating charge state, use I A Discharge each backup power battery and measure the voltage drop of each backup power battery at the moment of discharge; where I A The nominal current of the preset ratio

[0061] Based on the preset magnification and the voltage drop of each backup power battery, the internal resistance of each backup power battery is calculated.

[0062] The calculation formula for the internal resistance of each backup power battery is:

[0063]

[0064] Among them, R i is the internal resistance of the ith backup power battery, ΔU i is the voltage drop of the ith backup power battery, I A It is the nominal current of the preset multiplier.

[0065] This embodiment provides a clear reference value by accurately measuring the initial internal resistance and capacity of each backup power supply battery before leaving the factory, so that subsequent health status monitoring can be more accurate.

[0066] Step S2: The power distribution terminal sets the detection cycle at intervals, controls the power module to detect the status of each backup power battery, and if the current backup power battery is in a floating charge state, the power module controls the DC / DC activation module to measure the internal resistance of the current backup power battery and sends it to the power distribution terminal;

[0067] This embodiment sets a detection cycle at intervals to regularly detect the change in the internal resistance of each backup power supply battery, so that the health status of each backup power supply battery can be dynamically grasped.

[0068] Step S3: judging whether the internal resistance of the current backup power supply battery is greater than a preset multiple of its initial resistance through the power distribution terminal, if so, proceeding to step S4, otherwise returning to step S2;

[0069] In this embodiment, specifically, the preset multiple is 1.3. If the preset multiple is set too large, the activation trigger may be too late, the battery may be severely degraded, and the recovery effect may be limited. If the preset multiple is set too low, the system may frequently activate the battery, which not only wastes resources, but also may accelerate battery aging. Setting the preset multiple to 1.3 can balance the risk of timely detection of battery problems and delayed triggering, ensuring that the battery is activated in time when the performance drops to a certain level, avoiding further battery degradation.

[0070] This embodiment automatically starts activation processing when the internal resistance of the current backup power battery exceeds a set threshold to prevent system failures caused by battery performance degradation. This dynamic monitoring and activation mechanism can effectively extend the battery life and reduce maintenance costs.

[0071] Step S4: the power module controls the DC / DC activation module to activate the current backup power battery, and sends the capacity of the current backup power battery after activation measured by the DC / DC activation module to the power distribution terminal;

[0072] In this embodiment, preferably, the DC / DC activation module performs activation processing on the current backup power battery, including:

[0073] Step S41: Set I0=I A, set the maximum number of cycles to N, set the second preset time, set the number of activation times, and the current cycle number n = 1;

[0074] Step S42: Discharge and charge the current backup power battery according to the intermittent charging curve of I0, and calculate the capacity of the current backup power battery in the nth cycle, n = n + 1;

[0075] Step S43: If n < N, then after an interval of the second preset time, set I0 to a value within a preset range centered on I A and return to Step S42; if n = N, then stop the current cycle, and select the I0 corresponding to the maximum battery capacity from the historical cycles, and repeat Step S42 until the number of activation times is reached.

[0076] As Figure 2 shown, Figure 2 it is a schematic diagram of the intermittent charging curve of I0.

[0077] In this embodiment, preferably, the DC / DC activation module discharges and charges each backup power battery through the intermittent charging curve of I0, and calculates the capacity of each backup power battery, including:

[0078] When the current backup power battery is fully charged, discharge the current backup power battery with I0 until the voltage of the current backup power battery reaches the full discharge voltage, and obtain the full discharge time of the current backup power battery, where I0 is the activation current;

[0079] After full discharge, after an interval of the first preset time, charge the battery to the full charge voltage with I0 to obtain the first full charge time of the current backup power battery;

[0080] After obtaining the first full charge time of the current backup power battery, after an interval of the first preset time, use to charge the battery to the full charge voltage to obtain the second full charge time of the current backup power battery;

[0081] After obtaining the second full charge time of the current backup power battery, after an interval of the first preset time, use to charge the battery to the full charge voltage to obtain the third full charge time of the current backup power battery;

[0082] Based on I0, the full discharge time, the first full charge time, the second full charge time, and the third full charge time of each backup power battery, calculate the capacity of each backup power battery; the calculation formula is:

[0083]

[0084] Among them, Q is the capacity of the current backup power supply battery, I0 is the activation current, t2=t1+Δt, t1 is the full discharge moment of the current backup power supply battery, Δt is the first preset time, t3 is the first full charge moment of the current backup power supply battery, t4=t3+Δt, t5 is the second full charge moment of the current backup power supply battery, t6=t5+Δt, t7 is the third full charge moment of the current backup power supply battery, and i(τ) is the instantaneous current at time τ.

[0085] The DC / DC activation module discharges and charges each backup power battery through the intermittent charging curve of I0, and calculates the capacity of each backup power battery. Conventional battery activation processes usually use a fixed charging current and lack dynamic adjustment for the actual battery conditions. The present invention adjusts the activation current I0 according to the real-time capacity of the battery after each cycle, and the activation current I0 is adjusted at I0. A Fine-tuning is performed within a preset range of the center. This dynamic adjustment can optimize the charging process according to the health status of the battery and improve the battery activation effect. Different from the traditional solution that adopts a single fixed time interval and a fixed current for charging and discharging, the intermittent charging curve of I0 proposed in the present invention is used to complete the battery discharge and charging for each backup power battery. By setting a second preset time for adjusting the interval time and combining the intermittent charging curve, the charging cycle and the current amplitude can be controlled more accurately, thereby reducing damage to the battery and increasing the possibility of battery capacity recovery, so that the battery capacity activation effect is better, and the activation cycle time can be compressed, realizing the closed-loop control of battery capacity detection and activation operation.

[0086] Step S5: Based on the capacity of the current backup power battery after activation and its initial capacity, the power distribution terminal updates the remaining capacity percentage of the backup power battery, and determines whether the remaining capacity percentage of the current backup power battery is less than the preset percentage. If so, an aging alarm of the current backup power battery is issued. Otherwise, when the battery pack activation loop is closed, the set detection period is shortened and the process returns to step S2.

[0087] During the activation process of the backup power battery pack, if the power module detects that the main power supply is in a missing state, the distribution terminal controls the relay switching module through the interrupt service program to shut down the battery pack activation circuit, close the backup power supply circuit, and supply power to the power module through the backup power battery pack; after the main power supply is restored, the backup power supply circuit is kept closed until the set detection cycle is reached, then the backup power supply circuit is shut down and the battery pack activation circuit is closed.

[0088] In the case where the main power supply is missing, the relay switching module can switch the battery pack activation circuit to the backup power supply circuit, ensuring the continuous and stable operation of the power distribution system in emergencies, improving the reliability and safety of the system, and reducing the risks caused by power interruptions. In this embodiment, specifically, the preset percentage is 80%. Setting the preset percentage to 80% can detect the aging problem that may occur in the backup power battery in advance. In the power distribution system, the backup power battery pack is used as an emergency power supply when the main power supply is missing. If the battery capacity is too low, when the main power supply fails, it may not be able to provide sufficient power to maintain the operation of key system equipment. Setting it to 80% can leave enough time and operating space for subsequent maintenance and battery replacement, ensuring that the battery pack can provide reliable power support when the backup power supply is really needed.

[0089] In this embodiment, preferably, based on the capacity of the current backup power battery after activation and its initial capacity, the power distribution terminal updates the remaining capacity percentage of the backup power battery, and the formula is:

[0090]

[0091] Among them, Q s is the remaining capacity percentage of the backup power battery after update, Q is the capacity of the current backup power battery after activation, and Q0 is the initial capacity of the current backup power battery.

[0092] By judging whether the remaining capacity percentage of the current backup power battery is less than 80%, an aging alarm of the current backup power battery is issued. Through automated battery health detection, activation and capacity measurement, the need for manual intervention is greatly reduced. Operation and maintenance personnel can focus more on other management tasks of the system, reducing the risk of human error and improving operation and maintenance efficiency and work safety.

[0093] The first embodiment of the present invention reduces the burden on equipment operation and maintenance personnel by automatically closing the loop of activation operation and capacity monitoring; utilizes a DC / DC activation module and adopts a battery DC resistance measurement method to achieve indirect monitoring of the capacity of a battery cell, which can be completed within milliseconds with high real-time performance, and automatically completes battery activation based on the monitoring results; battery capacity detection and activation operation are closed-loop linked, and the activation current is optimized based on the activation cycle charging power, and a decision is made as to whether the battery can continue to be used normally based on the battery capacity after activation; an intermittent activation charging current method is adopted, and the battery capacity activation effect is better, and the activation cycle time can be compressed, so that the backup power supply of the distribution terminal can be effectively and adaptively activated.

[0094] Based on the first embodiment, the second embodiment sets the nominal current I A The current is set to 0.1C, and the initial detection period is set to 1 month. The specific steps are as follows:

[0095] When leaving the factory, each backup power battery is in the floating charge state, and a 0.1C current is used to discharge each backup power battery. At the moment of discharge, the voltage drop of each backup power battery is measured;

[0096] Based on the nominal current at the preset rate and the voltage drop of each backup power battery, the internal resistance of each backup power battery is calculated.

[0097] The power module controls the DC / DC activation module to complete battery discharge and charging for each backup power battery through an intermittent charging curve of I0=0.1C, and calculates the capacity of each backup power battery.

[0098] The power distribution terminal controls the power module to detect the status of each backup power battery at an interval of one month. If the current backup power battery is in a floating charge state, the power module controls the DC / DC activation module to measure the internal resistance of the current backup power battery and send it to the power distribution terminal.

[0099] The power distribution terminal determines whether the internal resistance of the current backup power supply battery is greater than 1.3 times of its initial resistance. If not, the detection period is still set to 1 month. If satisfied, the power module controls the DC / DC activation module to activate the current backup power supply battery, and sends the capacity of the current backup power supply battery after activation measured by the DC / DC activation module to the power distribution terminal;

[0100] In this embodiment, I0=0.1C is set, the maximum number of cycles is set to 2, the second preset time is set to 30 min, and the number of activations is set to 2;

[0101] According to the intermittent charging curve of I0=0.1C, the current backup power supply battery is discharged and charged, and the capacity Q1 of the first cycle of the current backup power supply battery is calculated;

[0102] Set I0 to 0.15C, discharge and charge the current backup power battery according to the intermittent charging curve of I0 = 0.15C, and calculate the capacity Q2 of the second cycle of the current backup power battery;

[0103] Select the activation current I0 corresponding to the maximum capacity of Q1 and Q2, and discharge and charge the current backup power supply battery according to the intermittent charging curve of I0. Repeat the operation twice to obtain the capacity of the current backup power supply battery after activation and send it to the power distribution terminal.

[0104] During this process, if the main power supply is missing, the activation process is interrupted, and the battery activation circuit is switched to the backup power supply circuit through the relay switching module to achieve uninterrupted power supply to the distribution terminal, and the interruption is returned when the main power supply is restored.

[0105] Based on the capacity of the current backup power supply battery after activation and its initial capacity, the distribution terminal updates the remaining capacity percentage of the backup power supply battery, and determines whether the remaining capacity percentage of the current backup power supply battery is less than 80%. If so, an aging alarm of the current backup power supply battery is issued, otherwise the set detection period is shortened and the monitoring period is set to 1 week; at an interval of 1 week, the distribution terminal controls the power supply module to detect the status of each backup power supply battery again.

[0106] refer to Figure 3 The third embodiment provides a device for adaptively activating a backup power supply of a power distribution terminal, which is used to implement the above-mentioned method for adaptively activating a backup power supply of a power distribution terminal, including:

[0107] Power module:

[0108] Its output end is connected to the input end of the power distribution terminal, used to provide power to the power distribution terminal, and is connected to the power distribution terminal for communication;

[0109] Its output end is connected to the input end of the relay switching module to provide electrical energy to the relay switching module;

[0110] Its input end is connected to the output end of the main power supply through the main power supply circuit, and is used to receive the electric energy of the main power supply, monitor the status of the main power supply and send it to the power distribution terminal;

[0111] Its input end is connected to the output end of the backup power battery pack through the backup power supply circuit, and is used to receive the electric energy of the backup power battery pack when the main power supply is in the missing state; its output end is connected to the input end of the backup power battery pack through the backup power supply circuit, and is used to provide electric energy to the backup power battery pack when the main power supply resumes operation, and sets the detection cycle at intervals, receives the control command of the power distribution terminal, monitors the status of the backup power battery pack and sends it to the power distribution terminal;

[0112] Its DC / DC activation module is connected to the backup power battery pack through a battery pack activation circuit, and is used to receive a measurement instruction sent by a distribution terminal, and measure the internal resistance of each backup power battery in the backup power battery pack; receive the activation instruction sent by the distribution terminal, activate the backup power battery in the backup power battery pack whose internal resistance is greater than a preset multiple of its initial resistance, and measure the capacity of the activated backup power battery and return it to the distribution terminal, so that the distribution terminal can issue a backup power battery aging alarm when the percentage of the remaining capacity of the backup battery pack is less than a preset percentage, otherwise when the battery pack activation circuit is closed, shorten the set detection period;

[0113] A relay switching module, whose output end is connected to the input end of the backup power battery pack, and whose input end is connected to the battery pack activation circuit and the backup power supply circuit. It is connected to the distribution terminal for communication and is used to receive a switching instruction sent by the interrupt service program of the distribution terminal. When the main power supply is in operation, the backup power supply circuit is closed and the battery pack activation circuit is in an off state. When the main power supply is in operation, a detection cycle is set based on the distribution terminal. When the status of each backup power battery is detected, the battery pack activation circuit is closed and the backup power supply circuit is turned off. During the battery pack activation process, if the main power supply is in a missing state, the battery pack activation circuit is turned off and the backup power supply circuit is closed. After the main power supply is restored, the backup power supply circuit is kept closed until the set detection cycle is reached, the backup power supply circuit is turned off, and the battery pack activation circuit is closed.

[0114] In this embodiment, by introducing a DC / DC activation module, the activation of the backup power supply battery cells of the distribution terminal is realized, and the battery activation circuit and the backup power supply circuit are switched using a relay switching module, thereby realizing activation control and capacity monitoring of each battery cell, and solving the technical problem of intelligent management of battery life.

[0115] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0116] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0117] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0118] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0119] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for adaptively activating a backup power supply for a power distribution terminal, characterized in that: include: When the main power supply is in operation, the main power supply supplies power to the power module through the main power supply circuit; The power distribution terminal controls the relay switching module to close the backup power supply circuit between the power module and the backup power battery pack, so that the power module supplies power to the backup power battery pack; the battery pack activation circuit between the DC / DC activation module in the power module and the backup power battery combination is in a shut-off state; When the main power supply is in operation, based on the detection cycle set by the power distribution terminal, when the status of each backup power supply battery is detected, the power distribution terminal controls the relay switching module to close the battery pack activation circuit and shut down the backup power supply circuit. The backup power supply battery pack activation process includes: Step S1: When leaving the factory, the DC / DC activation module in the power distribution terminal control power module measures the initial internal resistance and initial capacity of each backup power battery; Step S2: The power distribution terminal sets the detection cycle at intervals, controls the power module to detect the status of each backup power battery, and if the current backup power battery is in a floating charge state, the power module controls the DC / DC activation module to measure the internal resistance of the current backup power battery and sends it to the power distribution terminal; Step S3: judging whether the internal resistance of the current backup power supply battery is greater than a preset multiple of its initial resistance through the power distribution terminal, if so, proceeding to step S4, otherwise returning to step S2; Step S4: the power module controls the DC / DC activation module to activate the current backup power battery, and sends the capacity of the current backup power battery after activation measured by the DC / DC activation module to the power distribution terminal; Step S5: Based on the capacity of the current backup power battery after activation and its initial capacity, the power distribution terminal updates the remaining capacity percentage of the backup power battery, and determines whether the remaining capacity percentage of the current backup power battery is less than the preset percentage. If so, an aging alarm of the current backup power battery is issued, otherwise, the detection period is reduced and the process returns to step S2; During the activation process of the backup power battery pack, if the power module detects that the main power supply is in a missing state, the distribution terminal controls the relay switching module through the interrupt service program to shut down the battery pack activation circuit, close the backup power supply circuit, and supply power to the power module through the backup power battery pack; after the main power supply is restored, the backup power supply circuit is kept closed until the set detection cycle is reached, then the backup power supply circuit is shut down and the battery pack activation circuit is closed.

2. A method for adaptively activating a backup power supply for a power distribution terminal according to claim 1, characterized in that: The DC / DC activation module discharges and charges each backup power battery through the intermittent charging curve of I0, and calculates the capacity of each backup power battery, including: When the current backup power supply battery is fully charged, I0 is used to discharge the current backup power supply battery until the voltage of the current backup power supply battery reaches the fully discharged voltage, and the fully discharged time of the current backup power supply battery is obtained, wherein I0 is the activation current; After the battery is fully discharged, at a first preset time interval, the battery is charged to a full-charge voltage using I0 to obtain a first full-charge time of the current backup power supply battery; After obtaining the first full charge time of the current backup power battery, the first preset time is passed and the Charge the battery to the full-charge voltage to obtain the second full-charge time of the current backup power battery; After obtaining the second full charge time of the current backup power battery, the first preset time is passed and the Charge the battery to the full-charge voltage to obtain the third full-charge time of the current backup power battery; Based on I0, the full discharge time, the first full charge time, the second full charge time and the third full charge time of each backup power supply battery, the capacity of each backup power supply battery is calculated.

3. A method for adaptively activating a backup power supply for a power distribution terminal according to claim 2, characterized in that: Based on I0, the full discharge time, the first full charge time, the second full charge time and the third full charge time of the current backup power supply battery, the capacity of the current backup power supply battery is calculated, and the calculation formula is: Among them, Q is the capacity of the current backup power supply battery, I0 is the activation current, t2=t1+Δt, t1 is the full discharge moment of the current backup power supply battery, Δt is the first preset time, t3 is the first full charge moment of the current backup power supply battery, t4=t3+Δt, t5 is the second full charge moment of the current backup power supply battery, t6=t5+Δt, t7 is the third full charge moment of the current backup power supply battery, and i(τ) is the instantaneous current at time τ.

4. A method for adaptively activating a backup power supply for a power distribution terminal according to claim 2, characterized in that: The DC / DC activation module sets I0 = I A , discharge and charge each backup power battery through the intermittent charging curve of I0, and calculate the initial capacity of each backup power battery, where I A It is the nominal current of the preset multiplier.

5. A method for adaptively activating a backup power supply for a power distribution terminal according to claim 3, characterized in that: The DC / DC activation module activates the current backup power battery, including: Step S41: Set I0=I A , set the maximum number of cycles to N, set the second preset time, set the number of activations, and the current number of cycles n = 1; Step S42: completing battery discharge and charging of the current backup power supply battery according to the intermittent charging curve of I0, and calculating the capacity of the current backup power supply battery in the nth cycle, where n=n+1; Step S43: If n < N, then after an interval of a second preset time, set I0 to a value within a preset range centered on I, and return to step S42; if n = N, then stop the current loop, and select the I0 corresponding to the largest battery capacity from the historical loops, and repeat step S42 until the activation times are reached. A ​ 6. A method for adaptively activating a backup power supply for a power distribution terminal according to claim 1, characterized in that: The internal resistance of each backup power battery is measured through the DC / DC activation module, including: In each backup power battery floating charge state, use I A Discharge each backup power battery and measure the voltage drop of each backup power battery at the moment of discharge; where I A The nominal current of the preset ratio Based on the preset magnification and the voltage drop of each backup power battery, the internal resistance of each backup power battery is calculated.

7. A method for adaptively activating a backup power supply for a power distribution terminal according to claim 6, characterized in that: The calculation formula for the internal resistance of each backup power battery is: Among them, R i is the internal resistance of the ith backup power battery, ΔU i is the voltage drop of the ith backup power battery, I A It is the nominal current of the preset multiplier.

8. A method for adaptively activating a backup power supply for a power distribution terminal according to claim 1, characterized in that: Based on the capacity of the current backup power battery after activation and its initial capacity, the power distribution terminal updates the remaining capacity percentage of the backup power battery. The formula is: Among them, Q s is the remaining capacity percentage of the backup power battery after update, Q is the capacity of the current backup power battery after activation, and Q0 is the initial capacity of the current backup power battery.

9. A device for adaptively activating a backup power supply for a power distribution terminal, characterized in that: A method for adaptively activating a backup power supply for a power distribution terminal according to any one of claims 1 to 8, comprising: Power module: Its output end is connected to the input end of the power distribution terminal, used to provide power to the power distribution terminal, and is connected to the power distribution terminal for communication; Its output end is connected to the input end of the relay switching module to provide electrical energy to the relay switching module; Its input end is connected to the output end of the main power supply through the main power supply circuit, and is used to receive the electric energy of the main power supply, monitor the status of the main power supply and send it to the power distribution terminal; Its input end is connected to the output end of the backup power battery pack through the backup power supply circuit, and is used to receive the electric energy of the backup power battery pack when the main power supply is in the missing state; its output end is connected to the input end of the backup power battery pack through the backup power supply circuit, and is used to provide electric energy to the backup power battery pack when the main power supply resumes operation, and sets the detection cycle at intervals, receives the control command of the power distribution terminal, monitors the status of the backup power battery pack and sends it to the power distribution terminal; Its DC / DC activation module is connected to the backup power battery pack through a battery pack activation circuit, and is used to receive a measurement instruction sent by a distribution terminal, and measure the internal resistance of each backup power battery in the backup power battery pack; receive the activation instruction sent by the distribution terminal, activate the backup power battery in the backup power battery pack whose internal resistance is greater than a preset multiple of its initial resistance, and measure the capacity of the activated backup power battery and return it to the distribution terminal, so that the distribution terminal can issue a backup power battery aging alarm when the percentage of the remaining capacity of the backup battery pack is less than a preset percentage, otherwise when the battery pack activation circuit is closed, shorten the set detection period; A relay switching module, whose output end is connected to the input end of the backup power battery pack, and whose input end is connected to the battery pack activation circuit and the backup power supply circuit. It is connected to the distribution terminal for communication and is used to receive a switching instruction sent by the interrupt service program of the distribution terminal. When the main power supply is in operation, the backup power supply circuit is closed and the battery pack activation circuit is in an off state. When the main power supply is in operation, a detection cycle is set based on the distribution terminal. When the status of each backup power battery is detected, the battery pack activation circuit is closed and the backup power supply circuit is turned off. During the battery pack activation process, if the main power supply is in a missing state, the battery pack activation circuit is turned off and the backup power supply circuit is closed. After the main power supply is restored, the backup power supply circuit is kept closed until the set detection cycle is reached, the backup power supply circuit is turned off, and the battery pack activation circuit is closed.

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