CN111123126B - System and method for testing capacity of on-line storage battery directly supplied by high-voltage direct current and commercial power - Google Patents
System and method for testing capacity of on-line storage battery directly supplied by high-voltage direct current and commercial power Download PDFInfo
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Abstract
The invention provides an online storage battery capacity test system and method in a high-voltage direct-current and commercial power direct-supply mode, which relate to the technical field of storage battery capacity test technology, wherein the system comprises a storage battery pack powered by a high-voltage direct-current power supply system; a rectifier for supplying a charging voltage to the secondary battery; the rectifier control unit is used for controlling the rectifying module to regulate the output voltage; the data acquisition and monitoring unit is used for monitoring the state of the storage battery in real time and acquiring data information of the storage battery during discharge test; and the data analysis and processing unit is used for processing and analyzing the data information of the storage battery acquired by the data acquisition and monitoring unit. The invention solves the problem of online storage battery capacity test in a high-voltage direct current and commercial power direct supply mode: the online discharge test of the storage battery is adopted in the data center high-voltage direct current and commercial power direct supply mode, the defect of an offline test in a traditional storage battery capacity test is overcome, and the safety and the convenience of operation are improved.
Description
Technical Field
The invention relates to a storage battery capacity testing technology, in particular to an online storage battery capacity testing system and method in a high-voltage direct current and commercial power direct supply mode.
Background
A240 VDC (high voltage direct current, HVDC) power supply system is one of mainstream power supply systems of communication machine rooms and data centers at present. For dual-power load equipment, a conventional direct current system power supply mode is generally a single-system two-way power supply mode, and a 240V direct current system also supports a high-voltage direct current and commercial power direct supply mode, so that the availability is further improved, and the energy consumption is saved. However, in this mode, the storage battery pack of the power supply system cannot perform an online capacity test in a conventional manner, and needs to be researched and solved to find an innovative method so as to improve timeliness, accuracy and convenience of maintenance of the storage battery pack.
The present application was made based on this.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the invention provides an online storage battery capacity test system and method in a high-voltage direct-supply and commercial power direct-supply mode, so as to solve the problem of online storage battery capacity test in a high-voltage direct-supply and commercial power direct-supply mode.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an online capacity test system for storage battery in high voltage DC and commercial power direct supply mode comprises
The storage battery is powered by the high-voltage direct-current power supply system;
a rectifier for supplying a charging voltage to the secondary battery;
the rectifier control unit is used for controlling the rectifying module to regulate the output voltage;
the data acquisition and monitoring unit is used for monitoring the state of the storage battery in real time and acquiring data information of the storage battery during discharge test;
the data analysis and processing unit is used for processing and analyzing the data information of the storage battery acquired by the data acquisition and monitoring unit;
the power supply mode of the high-voltage direct-current power supply system selects a high-voltage direct-current power supply mode and a commercial power direct-supply mode.
Preferably, the data acquisition and monitoring unit is a power device and an environment centralized monitoring system which are commonly used in the prior art.
Preferably, the data information includes total voltage, total current, temperature, and cell voltage of the secondary battery pack.
Preferably, the rectifier module is set to be lower than the voltage of the single group of storage batteries regulated by the test system.
Preferably, the sampling frequency of the data acquisition and monitoring unit is 5-10 seconds.
A method for testing the capacity of an on-line high-voltage direct-current and commercial power direct-supply storage battery comprises the following steps:
step one, regulating the output voltage of a rectifier: under the modes of high-voltage direct current and commercial power direct supply, the rectifier control unit controls the rectifier module to regulate the output voltage;
step two, carrying out discharge test on the storage battery;
step three, data acquisition and monitoring: monitoring the state of the storage battery in real time through a data acquisition and monitoring unit, and acquiring data information of the storage battery during discharge test;
calculating residual capacity and estimating discharge time;
step five, detecting an abnormal storage battery: and (5) selecting the abnormal storage battery by adopting the mean curve as the standard change rate of the storage battery voltage and combining with boxline graph analysis.
Preferably, in the fourth step, the calculation formula of the percentage of the discharge capacity is as follows:
C10＝I*t/η(1+a(T－25))
step four discharge capacity percentage ═ C10V (battery capacity) 100%
C10: the capacity value at 10 hours rate at 25 degrees current is indicated by the ambient temperature.
Eta: a capacity coefficient; a: capacity temperature coefficient;
wherein the discharge time t is estimated, 80% of the capacity is estimated,
t＝(Ce-C10)*η/I/(1+a(T－25))。
Cethe rated capacity of the tested storage battery pack is obtained.
Preferably, in the fifth step, a mean value graph is drawn to display the variation trends of the voltage, the current, the temperature and the cell voltage of the storage battery and the deviation degree of any storage battery from the mean value, and each time is compared through a mean value difference value and then summarized.
Preferably, in the step five, in the boxplot analysis, each time point is compared, the number of times of the battery abnormality is statistically analyzed in combination with all the time points, and a threshold value is set, and if the threshold value is exceeded, the battery is determined to be an abnormal battery.
Preferably, the method further comprises the following step of detecting the abnormality in the test process: in the discharge test process of the storage battery, setting and monitoring the lowest monomer voltage and the total voltage value, estimating the residual capacity, and setting and monitoring the test duration; and stopping the test when the lowest single voltage, the total voltage value, the estimated residual capacity and the test time are reached.
The working principle of the invention is as follows: the invention deals with a power supply mode of 'high-voltage direct current + commercial power direct supply' in a communication machine room and a data center, solves the problem of online capacity test of the storage battery pack, and simultaneously, directly integrates the high-voltage direct current + commercial power direct supply online storage battery test function in the current research and test stage into the provincial ring upgrading platform in a functional module embedding mode on the basis of upgrading and transforming the provincial ring platform, so as to carry out the test of timeliness, accuracy and convenience verification of the storage battery pack maintenance, and after the verification is passed, the storage battery pack can be popularized to the provincial through the provincial platform opening permission.
According to the internal action characteristics of the power supply of the equipment, the following 2 ways are generally available for realizing online storage battery discharge at present:
in the first approach (the existing scheme), a direct-current voltage regulating device is connected to one group of the storage batteries to improve the voltage of a storage battery bus, so that the detected storage battery pack discharges to independently supply power to equipment, and the other group of the storage batteries is charged; the commercial power is in an online working state; once the storage battery fails or other conditions exist, the other storage battery can guarantee the bus voltage, and the power supply safety of the equipment is guaranteed. The biggest disadvantage of this scheme is that direct current voltage adjusting device acquisition cost is very big, and especially the cost reaches more than 20 ten thousand about large capacity device 500A, and installation space also does not do benefit to the project and promotes.
In the second approach (the scheme of the invention), the voltage and the current are acquired and monitored by the conventional moving ring system, the output voltage of the rectifier module is reduced by utilizing the remote adjusting function commonly possessed by the conventional high-voltage direct-current equipment, the storage battery discharges electricity to the equipment through the bus, and the moving ring monitoring system can directly judge the failed storage battery and generate a report by measuring the voltage and the current of the single storage battery in time. The scheme is characterized in that the existing resources can be utilized to the maximum extent for integration, the application cost is low and extremely low, and the popularization is facilitated; meanwhile, intensive monitoring, intensive testing and intensive maintenance are achieved, and great advantages are achieved in timeliness, effectiveness and convenience.
The invention directly inputs the on-line test of the high-voltage direct current and commercial power direct supply storage battery pack through the existing dynamic loop network, and the data analysis and processing module in the test system mainly realizes the functions as follows: the method comprises the steps of analyzing data, judging whether the data are normal or not, intelligently starting and stopping tests, intelligently generating test reports and the like, and meanwhile field wiring is achieved through a ready-made moving loop network without independent wiring.
The invention can realize the following technical effects:
(1) the invention solves the problem of online storage battery capacity test in a high-voltage direct current and commercial power direct supply mode: the online discharge test of the storage battery is adopted in the data center high-voltage direct current and commercial power direct supply mode, the defect of an offline test in a traditional storage battery capacity test is overcome, and the safety and the convenience of operation are improved.
(2) The invention greatly improves the efficiency of the storage battery test: according to the mode of the traditional storage battery capacity test, the hourly rate of 1000AH storage batteries is more than 80%, the same team can only test 2 groups at most one day, the operation is complex, and the measurement is complicated; by adopting the online measurement method of the storage battery in the mode of high-voltage direct-current and commercial power direct supply, theoretically, one team can simultaneously measure 2 machine rooms in one day, the storage battery pack test is not more than 100 groups, and all reports from measurement to generation are automatically generated by a background, so that the requirements on accuracy and timeliness are embodied.
(3) The invention has the advantages of more energy saving: in the traditional off-line storage battery pack discharge test, basically, a dummy load releases electric energy stored in a storage battery into the air in a thermal energy mode, and the continuous discharge capacity of the storage battery pack is detected; in this mode, the electric energy stored in the storage battery is continuously discharged in a manner of supplying power to the device.
Drawings
FIG. 1 is a block diagram of an online battery capacity testing system in the high voltage DC and commercial power direct supply mode according to the present embodiment;
FIG. 2 is a box diagram of the battery of this embodiment after discharge testing;
fig. 3 is a load characteristic diagram of a certain company in the one-line mains supply one-line high-voltage direct-current power supply mode according to the embodiment, supported by IT equipment;
fig. 4 is a load characteristic diagram of the single-path high-voltage dc power supply mode of the present embodiment supported by IT devices of several companies;
fig. 5 is a graph of the mean value of the standard rate of change of the battery voltage according to the present embodiment.
Detailed Description
In order to make the technical means and technical effects achieved by the technical means of the present invention more clearly and more perfectly disclosed, the following embodiments are provided, and the following detailed description is made with reference to the accompanying drawings:
as shown in FIG. 1, the online battery capacity testing system in the high voltage direct current and commercial power direct supply mode of the present embodiment includes
The storage battery is powered by the high-voltage direct-current power supply system; the power supply mode of the high-voltage direct-current power supply system selects a high-voltage direct-current power supply mode and a commercial power direct supply mode.
A rectifier for supplying a charging voltage to the secondary battery;
the rectifier control unit is used for controlling the rectifying module to regulate the output voltage; the rectifier control unit is a control unit of the high-voltage direct-current equipment, and the whole test system regulates and controls the charging voltage through a moving loop system; the rectification control unit enables the prior high-voltage direct-current equipment to have a remote regulation function and can reduce the output voltage of the rectification module.
The data acquisition and monitoring unit is used for regulating and monitoring the state of the storage battery in real time and acquiring data information of the storage battery during discharge test; the data acquisition and monitoring unit is the existing power equipment and environment centralized monitoring system (short for a dynamic loop system).
The data analysis and processing unit is used for processing and analyzing the data information of the storage battery acquired by the data acquisition and monitoring unit;
through the control of current rotating ring system to voltage and current, utilize the remote adjustment function that present high voltage direct current equipment generally had, reduce rectifier module output voltage, (rectifier module set voltage is higher than single section battery 1.8 x 120 ═ 216V, actually makes the adjustment according to equipment capability test back), the battery discharges to equipment through the bus, and monitored control system can be in time through the measurement of single section battery voltage, electric current, directly judges trouble battery and generate the statement.
The low float charge voltage is remotely regulated by utilizing the rectifier control module, and an online control protocol is provided and connected into a moving loop system by being supported by hardware direct-current voltage regulating equipment. In addition, in the discharging test process of the storage battery, the total voltage, the monomer voltage, the temperature (preferably, the temperature of the monomer storage battery can be monitored), the current latest storage battery measuring method such as an AH measuring method and a WH measuring method is needed to be monitored, the conventional test is completed through ampere-hour, the watt-hour can be measured in the embodiment, and the storage battery measuring methods are the prior art and are not the technical key points of the invention.
The method for testing the capacity of the storage battery directly supplied by the online high-voltage direct current and the commercial power comprises the following steps:
1. regulating the output voltage of the rectifier: under the modes of high-voltage direct current and commercial power direct supply, the rectifier control unit controls the rectifier module to reduce the output voltage;
2. carrying out discharge test on the storage battery;
3. data acquisition and monitoring: the state of the storage battery is monitored in real time through the data acquisition and monitoring unit, and data information of the storage battery during discharge test is acquired. The values of total voltage, total current, temperature and monomer voltage need to be monitored in real time in the discharging process of the storage battery, and the sampling frequency needs to be dense enough. The moving loop system mainly comprises a B interface and a C interface which are used for acquiring data in 2 modes, the performance of the B interface is better, and the acquisition frequency of once every 5-10 seconds can be realized through a hardware FSU.
4. Calculating residual capacity and estimating discharge time: the discharge capacity of the storage battery is closely related to the temperature and the discharge rate, and the nominal capacity (the capacity marked in the model specification) of the storage battery refers to the capacity of the storage battery when the temperature is 25 ℃ and the discharge current is 10 hours, so the actual discharge capacity of the storage battery is converted into the capacity values of 25 ℃ and 10 hours, and the capacity values are divided by the nominal capacity of the storage battery to obtain the capacity percentage of the storage battery.
Wherein the percentage of the discharge capacity is calculated by the following formula:
C10＝I*t/η(1+a(T－25))
step 4 percent of discharge capacity ═ C10V (battery capacity) number of cells100％
C10: the capacity value at 10 hours rate at 25 degrees current is indicated by the ambient temperature.
Eta: a capacity coefficient; a: capacity temperature coefficient;
wherein the discharge time t is estimated, 80% of the capacity is estimated,
t＝(Ce-C10)*η/I/(1+a(T－25))。
Cethe rated capacity of the tested storage battery pack is obtained.
The values of the capacity coefficient and the capacity temperature coefficient are shown in the following table:
TABLE 1
According to table 1, the selection of the values of η and a is related to the discharge rate.
Discharge rate V ═ discharge current/nominal capacity
In order to facilitate the programming and the access, the eta value and the a value are selected and compiled as follows:
TABLE 2
5. An anomaly detection step in the test process: in the discharge test process of the storage battery, setting and monitoring the lowest monomer voltage and the total voltage value, estimating the residual capacity, and setting and monitoring the test duration; and stopping the test when the lowest single voltage, the total voltage value, the estimated residual capacity and the test time are reached. The conditions for suspending the test are determined based on three predetermined factors: (1) the whole set of voltage reaches the initial set value of the test platform; (2) the voltage of the single-section lagging battery reaches the initial set value of the test platform; (3) the testing time reaches the initial set value of the testing platform; if any of the above elements is satisfied, the test is terminated. The stopping mode is that a command of recovering the charging voltage is sent to a control module in the high-voltage direct-current equipment through a moving ring monitoring network, the control module controls a rectifying module to recover the charging voltage, and the storage battery finishes discharging; and meanwhile, a data analysis and processing module in the test system automatically generates a test result report.
As shown in fig. 5, during the discharge test of the storage battery, a protection measure needs to be set to avoid causing unnecessary troubles. For example, the lowest cell voltage is set and monitored, and according to the relevant requirements, the terminating cell voltage value is 1.75V at the rate of 1 hour, and 1.8V at the rate of 3 hours; setting and monitoring a total voltage value, wherein the high-voltage direct current 240V is terminated to be 216V; residual capacity is estimated, and for the check capacity test, the discharge capacity is generally between 30% and 40%.
6. Detecting an abnormal storage battery: and (5) selecting the abnormal storage battery by adopting the mean curve as the standard change rate of the storage battery voltage and combining with boxline graph analysis. And (3) displaying the change trends of the voltage, the current, the temperature and the single voltage of the storage battery and the deviation degree of any storage battery from the mean value by drawing a mean value curve chart, comparing each moment through a mean value difference value, and summarizing.
As shown in fig. 2, a box plot is a data anomaly analysis method frequently used in statistics, and by finding out the median, the upper quartile and the lower quartile in the data and giving an anomaly factor to determine the screening size of the anomaly, the anomaly factor can be set according to the actual situation, and the box plot belongs to a highly controllable method. In the boxplot analysis, each time point is compared, the times of abnormity of the battery are counted and analyzed by combining all moments, a threshold value is set, and the abnormal battery is determined if the abnormal battery exceeds the threshold value, so that the boxplot analysis has high flexibility and certain adaptability to the environment. And combining the results of the two modes, comprehensively analyzing whether a certain storage battery is abnormal or not, and if the two analysis methods are considered as abnormal storage batteries at the same time, informing a user that the storage battery needs to be checked. The voltage, current, temperature, monomer voltage and other change conditions are displayed more visually through the curve chart, the values of all the monomer voltages at the same moment are displayed through the histogram, the lowest and highest monomer voltage conditions can be visually checked, and data visualization is achieved. In the discharging test process, any storage battery is monitored in real time, the system distinguishes large deviation in the discharging process and generates a test result report, and the dynamic performance is more timely and convenient than manual measurement.
According to the invention, by testing the brand equipment of a certain company by using the high-voltage direct-current equipment, the load characteristic is approximately as shown in fig. 3 and 4 in a high-voltage direct-supply mode of direct-current plus commercial power, the total power of the load is basically stable along with the reduction of the high-voltage direct-current voltage, and the current is increased along with the reduction of the voltage. It can be seen that under different voltage levels, the load characteristics of the equipment are kept stable, the operation is normal, and the charging voltage is adjusted to ensure that the storage battery discharges, and meanwhile, the working state of the equipment is kept stable.
According to the requirement of the storage battery on-line test, the IT equipment utilizes the existing high-voltage direct-current rectifier control module to adjust the float charging voltage to be low through a moving loop system network in a high-voltage direct-current + commercial power direct supply mode, and the storage battery pack is discharged on the premise of ensuring the normal work of the IT equipment; monitoring the state of the storage battery in real time in the discharging process, and acquiring the conditions of total voltage, current, temperature, internal resistance and the like of the storage battery; and after the test is finished, analyzing the voltage of the single storage battery, finding out the storage batteries with abnormity or worst performance, and finally forming a test report.
The online storage battery capacity test platform in the high-voltage direct-current and commercial power direct-supply mode can be developed on the basis of fully utilizing remote signaling, remote measuring and remote adjusting functions of a telecommunication room monitoring system and a power supply control module, and is low in popularization cost and high in efficiency; the device is suitable for an online storage battery capacity test in a high-voltage direct current and commercial power direct supply mode, and is also suitable for a double-circuit high-voltage direct current power supply mode. Under the large environment of enterprise deep reformation transformation, the intellectualization and intensification of the operation and maintenance of the equipment are well done, the operation and maintenance efficiency is improved, the operation and maintenance cost is reduced, and the method has a great popularization prospect.
The above description is provided for the purpose of further elaboration of the technical solutions provided in connection with the preferred embodiments of the present invention, and it should not be understood that the embodiments of the present invention are limited to the above description, and it should be understood that various simple deductions or substitutions can be made by those skilled in the art without departing from the spirit of the present invention, and all such alternatives are included in the scope of the present invention.
Claims (5)
1. An online storage battery capacity test method for high-voltage direct current and commercial power direct supply is based on an online storage battery capacity test system in a high-voltage direct current and commercial power direct supply mode, and the system comprises
The storage battery is powered by the high-voltage direct-current power supply system;
a rectifier for supplying a charging voltage to the secondary battery;
the rectifier control unit is used for controlling the rectifier to regulate the output voltage;
the data acquisition and monitoring unit is used for regulating and monitoring the state of the storage battery in real time and acquiring data information of the storage battery during discharge test;
the data analysis and processing unit is used for processing and analyzing the data information of the storage battery acquired by the data acquisition and monitoring unit;
the power supply mode of the high-voltage direct-current power supply system selects a high-voltage direct-current power supply mode and a commercial power direct supply mode;
the method comprises the following steps:
step one, regulating the output voltage of a rectifier: under the modes of high-voltage direct current and commercial power direct supply, the rectifier is controlled to regulate the output voltage through the rectifier control unit;
step two, carrying out discharge test on the storage battery;
step three, data acquisition and monitoring: monitoring the state of the storage battery in real time through a data acquisition and monitoring unit, and acquiring data information of the storage battery during discharge test;
calculating residual capacity and estimating discharge time;
step five, detecting an abnormal storage battery: the mean value curve is used as the standard change rate of the voltage of the storage battery, and the abnormal storage battery is screened out by combining the boxplot analysis;
step four, wherein the calculation formula of the percentage of the discharge capacity is as follows:
percent discharge capacity in step four ═ C10V (battery capacity) 100%
C10: the capacity value is 10 hours when the environment temperature is 25 ℃ current; eta: a capacity coefficient; a: capacity temperature coefficient;
wherein the discharge time t is estimated, 80% of the capacity is estimated,
Cethe rated capacity of the tested storage battery pack is set;
the fifth step of displaying the variation trends of the voltage, the current, the temperature and the single voltage of the storage battery and the deviation degree of any storage battery from the mean value by drawing a mean value curve chart, comparing each moment through a mean value difference value, and then summarizing;
in the boxplot analysis, each time point is compared, the times of abnormity of the battery are counted and analyzed by combining all moments, a threshold value is set, and the abnormal storage battery is determined if the abnormal storage battery exceeds the threshold value;
further comprises the following steps of detecting abnormality in the test process: in the discharge test process of the storage battery, setting and monitoring the lowest monomer voltage and the total voltage value, estimating the residual capacity, and setting and monitoring the test duration; and stopping the test when the lowest single voltage, the total voltage value, the estimated residual capacity and the test time are reached.
2. The method for testing the capacity of the on-line storage battery directly supplied by the high voltage direct current and the commercial power according to claim 1, wherein the method comprises the following steps: the data acquisition and monitoring unit is a power device and an environment centralized monitoring system which are commonly used at present.
3. The method for testing the capacity of the on-line storage battery directly supplied with high voltage direct current and commercial power of claim 1, wherein the method comprises the following steps: the data information includes total voltage, total current, temperature and cell voltage of the battery pack.
4. The method for testing the capacity of the on-line storage battery directly supplied with high voltage direct current and commercial power of claim 1, wherein the method comprises the following steps: the rectifier is set to adjust the voltage lower than that of the single group of storage batteries through the test system.
5. The method for testing the capacity of the on-line storage battery directly supplied with high voltage direct current and commercial power of claim 1, wherein the method comprises the following steps: and the sampling frequency of the data acquisition and monitoring unit is 5-10 seconds once.
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