CN114152892A - Monitoring method for battery health degree of fault indicator - Google Patents

Monitoring method for battery health degree of fault indicator Download PDF

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Publication number
CN114152892A
CN114152892A CN202111454077.2A CN202111454077A CN114152892A CN 114152892 A CN114152892 A CN 114152892A CN 202111454077 A CN202111454077 A CN 202111454077A CN 114152892 A CN114152892 A CN 114152892A
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battery
cut
voltage
battery health
fault indicator
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CN114152892B (en
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张凯
王伟
杨冬冬
郑志宏
俞华
晋涛
白鹭
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State Grid Electric Power Research Institute Of Sepc
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State Grid Electric Power Research Institute Of Sepc
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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
    • 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

Abstract

The invention belongs to the technical field of power system communication, and particularly relates to a monitoring method for the battery health degree of a fault indicator; the technical scheme is as follows: s1: the battery health degree monitoring module measures a battery port and charging current in real time to acquire data information; s2: storing a discharge characteristic curve and a temperature-to-discharge capacity influence curve of the battery to 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 cut-off voltageu cut_offB, calculating the battery capacity integrated by using the charging current value in the charging process, and calculating to obtain the battery health degree SOH; s5: comparing and analyzing the SOH with a threshold value, and outputting alarm information A; s6: and the collection unit generates alarm information B and transmits the alarm information B to the main station through configuring a communication point table of the fault indicator and the distribution automation main station.

Description

Monitoring method for battery health degree of fault indicator
Technical Field
The invention belongs to the technical field of power system communication, and particularly relates to a method for monitoring the battery health degree of a fault indicator.
Background
The distribution line fault indicators are largely used in a 10KV power distribution network and used for indicating short circuit and ground fault of the distribution lines; at present, a common fault indicator collection unit adopts a solar panel to supply power, a battery is used as a backup power supply, and the battery supplies power to the collection unit when the illumination condition is poor or at night; in the daytime with good illumination conditions, the solar panel supplies power to the collecting unit and charges the battery; in the field practical application of a power supply company, the fault indicator has the condition that a large number of night disconnection caused by power supply for the collecting unit at night is not met due to the fact that the capacity of the battery is attenuated, and the operation reliability of the fault indicator is seriously influenced.
At present, the fault indicator has a low-power alarm function, alarm information can be uploaded to a power distribution automation master station before the fault indicator is disconnected due to power loss, but the current fault indicator does not judge whether low-power alarm is caused by insufficient battery health degree, and the condition is that operation and maintenance personnel are really needed to intervene in time for processing.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a monitoring method for the health degree of a battery of a fault indicator.
In order to solve the technical problems, the invention adopts the technical scheme that: the monitoring method for the battery health degree of the fault indicator specifically comprises the following steps:
s1: the battery health degree monitoring module measures a battery port and charging current in real time, acquires data information, performs AD conversion at frequency f and time interval T which are 1/f, completes digital sampling, and measures the environment temperature where equipment is located.
S2: the discharge characteristic curve (figure 2 in the specification) and the temperature influence curve on the discharge capacity of the battery(FIG. 3) storing the data to the battery health monitoring module; the discharge characteristic curve represents the change of the battery voltage according to time under different discharge currents, and corresponding discharge cut-off voltage u is givencut_off-a；
The temperature-to-capacity influence curve gives the nominal capacity Q of the battery at different environmental temperaturesrated-a。
S3: measuring the real-time discharge current i, calculating the cut-off voltage u at the corresponding discharge current according to linear interpolation as shown in FIG. 2cut_off-b; let the actual discharge current i be in FIG. 2 at a given set value i1And i2Between corresponding cut-off voltages of u respectively1And u2Then the cut-off voltage u of the actual discharge current icut_off-b is: u. ofcut_off＝u1+(u2-u1)(i-i1)/(i2-i1)；
When the voltage reaches the cut-off voltage u in the discharge processcut_offB time battery capacity Q0＝0；
The nominal capacity Q of the battery at the corresponding temperature and the corresponding discharge current i is determined by using a linear interpolation method as shown in FIG. 3rated-b。
S4: at a cut-off voltage ucut_off-b calculating the battery capacity integrated by the charging current value during the initial charging, the calculation expression of the battery capacity being: q ═ idt + Q0═ idt ═ T Σ i (k), where: i (k) is a current sampling value at each time;
if the battery voltage reaches the float charge voltage, the corresponding Q is the maximum capacity QmaxThen, the calculation expression of the battery health degree is: SOH ═ Qmax/Qrated)×100％。
S5: and comparing and analyzing the SOH of the battery health degree with a threshold value, and if the SOH is less than the threshold value, inputting the alarm information A into the collection unit through the I/O port.
S6: and the collection unit generates alarm information B and transmits the alarm information B to the main station through configuring a communication point table of the fault indicator and the distribution automation main station.
Compared with the prior art, the invention has the beneficial effects that:
the invention has the advantages that the invention is practical and simple, the online monitoring function of the health degree of the batteries of the collecting unit is realized by adding the battery health degree detection module, when the health degree does not reach the standard due to aging of the batteries, the low health degree warning information of the batteries is timely uploaded to the distribution automation main station through the collecting unit, and operation and maintenance personnel are reminded to timely replace the batteries, so that the problem that the fault indicator frequently drops due to the reduction of the health degree of the batteries can be effectively solved, the quality level of equipment is improved, and the stable and reliable operation of the fault indicator of the distribution line is ensured; meanwhile, the operation and maintenance work of the terminal is purposeful, 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 structural view of the present invention;
FIG. 2 is a graph showing the discharge characteristics of the battery according to the present invention;
fig. 3 is a graph showing the effect of temperature on the discharge capacity of a 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, is used to characterize the capacity fade during battery use, may specify a low health threshold, and it is generally considered that the battery needs to be replaced when the health is below 80%.
The problem of low battery health degree alarm can be solved by two parts, namely, a battery health degree on-line monitoring device is added outside a collection unit, and a battery electric quantity calculation, a maximum capacity calculation and a health degree on-line estimation algorithm are integrated; and secondly, when the monitoring device detects that the health degree of the battery is lower than the threshold value, the information is transmitted to the collecting unit, and the low health degree warning information of the battery is transmitted to the power distribution automation master station from the collecting unit, so that operation and maintenance personnel are reminded to replace the battery in time.
As shown in fig. 1-3, the method for monitoring the battery health of the fault indicator specifically includes the following steps:
s1: the battery health degree monitoring module measures a battery port and charging current in real time to acquire data information;
s2: storing a discharge characteristic curve and a temperature-to-discharge capacity influence curve of the battery to the battery health monitoring module;
s3: measuring real-time discharge current i, and calculating cut-off voltage u under corresponding discharge current according to linear interpolation methodcut_off-b；
S4: at a cut-off voltage ucut_offB, calculating the battery capacity integrated by using the charging current value in the charging process, and calculating to obtain the battery health degree SOH;
s5: comparing and analyzing the SOH with a threshold value, and outputting alarm information A;
s6: and the collection unit generates alarm information B and transmits the alarm information B to the main station through configuring a communication point table of the fault indicator and the distribution automation main station.
Preferably, when the battery health monitoring module performs real-time monitoring in step S1, AD conversion is performed at a frequency f and a time interval T equal to 1/f, digital sampling is completed, and the ambient temperature where the device is located is measured.
Preferably, the discharge characteristic curve of step S2 represents the battery voltage variation with time under different discharge currents, and provides the corresponding discharge cut-off voltage ucut_off-a；
The temperature-to-capacity influence curve gives the nominal capacity Q of the battery at different environmental temperaturesrated-a。
Preferably, the step S3 specifically includes the following steps:
s301: setting the actual discharge current i between a set value i1And i2Between corresponding cut-off voltages of u respectively1And u2Then the cut-off voltage u of the actual discharge current icut_off-b is: u. ofcut_off＝u1+(u2-u1)(i-i1)/(i2-i1)；
S302: when the voltage reaches the cut-off voltage u during the discharge processcut_offB time battery capacity Q0＝0；
S303: determining nominal capacity of battery at corresponding temperature and corresponding discharge current i by using linear interpolation methodQuantity Qrated-b。
Preferably, the calculation expression of the battery capacity in step S4 is: q ═ idt + Q0═ idt ═ T Σ i (k), where: i (k) is a sampled value of the current at each time.
Preferably, in the step S4, when the battery voltage reaches the float voltage, the corresponding Q is the maximum capacity QmaxThen, the calculation expression of the battery health degree is: SOH ═ Qmax/Qrated)×100％。
Preferably, in step S5, when the SOH of the battery health degree is compared with the threshold, if the SOH is less 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 do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.

Claims (7)

1. The monitoring method for the battery health degree of the fault indicator is characterized by comprising the following steps:
s1: the battery health degree monitoring module measures a battery port and charging current in real time to acquire data information;
s2: storing a discharge characteristic curve and a temperature-to-discharge capacity influence curve of the battery to the battery health monitoring module;
s3: measuring real-time discharge current i, and calculating cut-off voltage u under corresponding discharge current according to linear interpolation methodcut_off-b；
S4: at a cut-off voltage ucut_offB, calculating the battery capacity integrated by using the charging current value in the charging process, and calculating to obtain the battery health degree SOH;
s5: comparing and analyzing the SOH with a threshold value, and outputting alarm information A;
s6: and the collection unit generates alarm information B and transmits the alarm information B to the main station through configuring a communication point table of the fault indicator and the distribution automation main station.
2. The method for monitoring the battery health of the fault indicator according to claim 1, wherein in the step S1, when the battery health monitoring module performs real-time monitoring, the frequency f and the time interval T are 1/f for performing AD conversion, completing digital sampling, and measuring the ambient temperature of the device.
3. The method for monitoring the health of a battery as claimed in claim 1, wherein the discharging characteristic curve of step S2 represents the variation of the battery voltage according to time under different discharging currents, and provides corresponding discharging cut-off voltage ucut_off-a；
The temperature-to-capacity influence curve gives the nominal capacity Q of the battery at different environmental temperaturesrated-a。
4. The method for monitoring the battery health of a fault indicator according to claim 1, wherein the step S3 specifically comprises the steps of:
s301: setting the actual discharge current i between a set value i1And i2Between corresponding cut-off voltages of u respectively1And u2Then the cut-off voltage u of the actual discharge current icut_off-b is: u. ofcut_off＝u1+(u2-u1)(i-i1)/(i2-i1)；
S302: when the voltage reaches the cut-off voltage u during the discharge processcut_offB time battery capacity Q0＝0；
S303: determining nominal capacity Q of battery at corresponding temperature and corresponding discharge current i by using linear interpolation methodrated-b。
5. The monitoring method for fault indicator battery health of claim 1,wherein the calculation expression of the battery capacity in step S4 is: q ═ idt + Q0═ idt ═ T Σ i (k), where: i (k) is a sampled value of the current at each time.
6. The method as claimed in claim 1, wherein the step S4 is performed when the battery voltage reaches the float voltage, and the corresponding Q is the maximum capacity QmaxThen, the calculation expression of the battery health degree is: SOH ═ Qmax/Qrated)×100％。
7. The monitoring method for the battery health of the fault indicator as claimed in claim 6, wherein the step S5 is to input the alarm information a to the collecting unit through the I/O port if the SOH < the threshold value when comparing the SOH of the battery health with the threshold value.
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