CN114152892B - Method for monitoring battery health of fault indicator - Google Patents
Method for monitoring battery health of fault indicator Download PDFInfo
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- CN114152892B CN114152892B CN202111454077.2A CN202111454077A CN114152892B CN 114152892 B CN114152892 B CN 114152892B CN 202111454077 A CN202111454077 A CN 202111454077A CN 114152892 B CN114152892 B CN 114152892B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention belongs to the technical field of power system communication, and particularly relates to a method for monitoring the health of a fault indicator battery; the technical scheme adopted is as follows: s1: the battery health monitoring module is used for measuring a battery port and charging current in real time to acquire data information; s2: storing a discharge characteristic curve and a temperature-discharge capacity influence curve of the battery into the battery health monitoring module; s3: measuring real-time discharge current i, and calculating cut-off voltage under corresponding discharge current according to linear interpolation methodu cut_off -b; s4: at the cut-off voltageu cut_off B, calculating the battery capacity integrated by using the charging current value in the charging process, and calculating to obtain the battery health SOH; s5: comparing and analyzing the battery health degree SOH with a threshold value, and outputting alarm information A; s6: and the collecting unit generates alarm information B and transmits the alarm information B to the master station by configuring a communication point table of the fault indicator and the power distribution automation master station.
Description
Technical Field
The invention belongs to the technical field of power system communication, and particularly relates to a method for monitoring the battery health of a fault indicator.
Background
Distribution line fault indicators are used in large numbers in 10KV distribution networks to indicate short circuits and ground faults of distribution lines; the current common fault indicator collecting unit adopts a solar panel to supply power, and a battery is used as a backup power supply, so that the battery supplies power for the collecting unit when the illumination condition is bad or at night; the solar panel supplies power to the collecting unit and charges the battery in the daytime when the illumination condition is good; in the field practical application of a power supply company, the fault indicator is found to have the condition that a large number of night lines are disconnected due to the fact that the capacity of a battery is attenuated and the power supply of a collecting unit at night is not met, so that the operation reliability of the fault indicator is seriously affected.
The current fault indicator has a low-power alarming function, and can upload alarming information to the power distribution automation master station before power failure and power failure, but the current fault indicator does not have the function of judging whether low-power alarming is caused by insufficient battery health, and the situation is really the situation that operation and maintenance personnel are needed to intervene in time for processing.
Disclosure of Invention
The invention overcomes the defects existing in the prior art and provides a method for monitoring the health of the fault indicator battery.
In order to solve the technical problems, the invention adopts the following technical scheme: the method for monitoring the battery health of the fault indicator specifically comprises the following steps:
s1: the battery health monitoring module is used for measuring a battery port and charging current in real time, acquiring data information, performing AD conversion at the frequency f and the time interval T=1/f, completing digital sampling, and measuring the environmental temperature of the equipment.
S2: storing a discharge characteristic curve (figure 2 of the specification) and a temperature versus discharge capacity influence curve (figure 3 of the specification) of the battery into the battery health monitoring module; the discharge characteristic curve represents the battery voltage change according to time under different discharge currents, and gives corresponding discharge cut-off voltage u cut_off -a；
The temperature versus discharge capacityThe impact curve gives the nominal capacity Q of the battery at different ambient temperatures rated -a。
S3: measuring the actual discharge current i, calculating the cut-off voltage u at the corresponding discharge current according to linear interpolation as shown in FIG. 2 cut_off -b; the actual discharge current i is set to be set to a value i shown in FIG. 2 1 And i 2 Corresponding cut-off voltages are u 1 And u 2 Cut-off voltage u of actual discharge current i cut_off -b is: u (u) cut_off-b ＝u 1 +(u 2 -u 1 )(i-i 1 )/(i 2 -i 1 )；
When the voltage reaches the cut-off voltage u during discharge cut_off -b time-set battery capacity Q 0 ＝0；
Determining the nominal capacity Q of the battery at the corresponding temperature, the corresponding discharge current i, by linear interpolation as in FIG. 3 rated -b。
S4: at a cut-off voltage u cut_off -b calculating a battery capacity using a numerical integration of the charging current during the start of charging, the battery capacity calculated by: q= ≡ idt+Q 0 = ≡idt=t Σi (k), where: i (k) is a current sampling value at each moment;
if the battery voltage reaches the float voltage, the corresponding Q is the maximum capacity Q max The calculation expression of the battery health is: soh= (Q) max /Q rated -b)×100％。
S5: and comparing and analyzing the battery health degree SOH with the threshold value, and if SOH is smaller than the threshold value, inputting the alarm information A to the collecting unit through the I/O port.
S6: and the collecting unit generates alarm information B and transmits the alarm information B to the master station by configuring a communication point table of the fault indicator and the power distribution automation master station.
Compared with the prior art, the invention has the following beneficial effects:
the invention is practical and simple, realizes the function of on-line monitoring the health degree of the assembled unit battery by adding the battery health degree detection module, and timely uploads the battery low health degree alarm information to the distribution automation master station through the assembled unit when the health degree is not up to standard due to battery aging, so as to remind operation and maintenance personnel to replace the battery in time, thereby effectively solving the problem that the fault indicator frequently drops due to the decrease of the health degree of the battery, improving the quality level of equipment and ensuring the stable and reliable operation of the fault indicator of the distribution line; meanwhile, the operation and maintenance work of the terminal is enabled to be in a vector state, and the operation and maintenance efficiency is greatly improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a graph of the discharge characteristics of a battery of the present invention;
fig. 3 is a graph showing the effect of temperature on the discharge capacity of the battery according to the present invention.
Detailed Description
Battery health (SOH), which is generally defined as the ratio of the current maximum capacity to the nominal capacity to characterize capacity fade during battery use, may define a low health threshold, and is generally considered to require replacement when the health is below 80%.
The problem of low health degree warning of the battery can be solved by two parts, namely, a battery health degree online monitoring device is additionally arranged outside the collecting unit, and battery electric quantity calculation, maximum capacity calculation and health degree online estimation algorithm are integrated; secondly, when the monitoring device detects that the battery health is lower than a threshold value, information is transmitted to the collecting unit, and the collecting unit sends low-health warning information of the battery to the distribution automation master station to remind operation and maintenance personnel of timely replacing the battery.
As shown in fig. 1-3, the method for monitoring the battery health of the fault indicator specifically comprises the following steps:
s1: the battery health monitoring module is used for measuring a battery port and charging current in real time to acquire data information;
s2: storing a discharge characteristic curve and a temperature-discharge capacity influence curve of the battery into the battery health monitoring module;
s3: measuring actual discharge current i, calculating corresponding discharge current according to linear interpolation methodIs set to the cutoff voltage u of (2) cut_off -b；
S4: at a cut-off voltage u cut_off B, calculating the battery capacity integrated by using the charging current value in the charging process, and calculating to obtain the battery health SOH;
s5: comparing and analyzing the battery health degree SOH with a threshold value, and outputting alarm information A;
s6: and the collecting unit generates alarm information B and transmits the alarm information B to the master station by configuring a communication point table of the fault indicator and the power distribution automation master station.
Preferably, when the battery health monitoring module in step S1 monitors in real time, the AD conversion is performed at the frequency f and the time interval t=1/f, so as to complete digital sampling, and the ambient temperature of the device is measured.
Preferably, the discharge characteristic curve in step S2 characterizes the time-dependent change of the battery voltage at different discharge currents, giving a corresponding discharge cut-off voltage u cut_off -a；
The temperature versus discharge capacity effect curve gives the nominal capacity Q of the battery at different ambient temperatures rated -a。
Preferably, the step S3 specifically includes the following steps:
s301: setting the actual discharge current i between the set value i 1 And i 2 Corresponding cut-off voltages are u 1 And u 2 Cut-off voltage u of actual discharge current i cut_off -b is: u (u) cut_off-b ＝u 1 +(u 2 -u 1 )(i-i 1 )/(i 2 -i 1 )；
S302: when the voltage reaches the cut-off voltage u during discharging cut_off -b time-set battery capacity Q 0 ＝0；
S303: determining nominal capacity Q of battery at corresponding temperature and corresponding discharge current i by linear interpolation method rated -b。
Preferably, the calculation expression of the battery capacity in step S4 is: q= ≡ idt+Q 0 = ≡idt=t Σi (k), where: i (k) is a current sample value at each time.
Preferably, in the step S4, if the battery voltage reaches the float voltage, the corresponding Q is the maximum capacity Q max The calculation expression of the battery health is: soh= (Q) max /Q rated -b)×100％。
Preferably, in the step S5, when comparing the battery health SOH with the threshold, if SOH is smaller than the threshold, the alarm information a is input to the collecting unit through the I/O port.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and are not intended to limit the invention. Modifications and improvements to the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications and changes which have been accomplished by those skilled in the art without departing from the spirit and technical spirit of the present invention should be covered by the appended claims.
Claims (6)
1. The method for monitoring the battery health of the fault indicator is characterized by comprising the following steps of:
s1: the battery health monitoring module is used for measuring a battery port and charging current in real time to acquire data information;
s2: storing a discharge characteristic curve and a temperature-discharge capacity influence curve of the battery into the battery health monitoring module;
s3: measuring actual discharge current i, calculating cut-off voltage u under corresponding discharge current according to linear interpolation method cut_off -b；
S4: at a cut-off voltage u cut_off B, calculating the battery capacity integrated by using the charging current value in the charging process, and calculating to obtain the battery health SOH;
s5: comparing and analyzing the battery health degree SOH with a threshold value, and outputting alarm information A;
s6: the method comprises the steps that through configuration of a communication point table of a fault indicator and a power distribution automation master station, a collecting unit generates alarm information B and transmits the alarm information B to the master station;
the step S3 specifically comprises the following steps:
s301: setting the actual discharge current i between the set value i 1 And i 2 Corresponding cut-off voltages are u 1 And u 2 Cut-off voltage u of actual discharge current i cut_off -b is: u (u) cut_off-b ＝u 1 +(u 2 -u 1 )(i-i 1 )/(i 2 -i 1 )；
S302: when the voltage reaches the cut-off voltage u during discharging cut_off -b time-set battery capacity Q 0 ＝0；
S303: determining nominal capacity Q of battery at corresponding temperature and corresponding discharge current i by linear interpolation method rated -b。
2. The method according to claim 1, wherein the step S1 of performing AD conversion at frequency f and time interval t=1/f to complete digital sampling and measure the environmental temperature of the device when the battery health monitoring module performs real-time monitoring.
3. The method according to claim 1, wherein the discharge characteristic curve in step S2 characterizes the change of the battery voltage according to time at different discharge currents, and gives the corresponding discharge cut-off voltage u cut_off -a；
The temperature versus discharge capacity effect curve gives the nominal capacity Q of the battery at different ambient temperatures rated -a。
4. The method for monitoring the battery health of a fault indicator according to claim 1, wherein the calculation expression of the battery capacity in step S4 is: q= ≡ idt+Q 0 = ≡idt=t Σi (k), where: i (k) is a current sample value at each time.
5. The method according to claim 1, wherein the step S4 is performed if the battery voltage reaches the float chargeAt voltage, the corresponding Q is the maximum capacity Q max The calculation expression of the battery health is: soh= (Q) max /Q rated -b)×100％。
6. The method according to claim 5, wherein the step S5 is to input the alarm information a to the collecting unit through the I/O port if SOH < threshold value when comparing the battery health SOH with the threshold value.
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