CN216563283U - A battery online self-maintenance system - Google Patents

Abstract

An on-line self-maintenance system for a battery includes a low-voltage AC system and a DC charger, the low-voltage AC system is connected to the input end of the DC charger, the output end of the DC charger is connected to a DC bus, the DC bus is connected to a storage battery, and the storage battery Connected in parallel, each single battery in the group is connected by an intelligent switch, the positive and negative electrodes of each single battery are connected to the test bus through the intelligent switch, and the test bus is connected in parallel with a voltmeter circuit, a charging circuit and a discharging circuit. The loop is composed of an intelligent switch, a DC charging power supply and an ammeter A in series, and the discharge loop is composed of an intelligent switch, an ammeter B and an adjustable discharge resistance. The intelligent switch, the voltmeter, the ammeter, and the adjustable discharge resistance are collected through data The card is connected to the control center, and the positive terminal of each single battery is connected to the common terminal of the test bus through an intelligent switch.

Description

A battery online self-maintenance system

technical field

The invention relates to a battery maintenance system in the field of electric power systems, in particular to an online self-maintenance system for a battery.

Background technique

Under normal circumstances, the low-voltage AC system provides power for the DC bus and DC equipment through the DC charger, and the battery mounted on the DC bus is always in a floating state.

When serious faults such as total substation voltage loss occur, the battery mounted on the DC bus becomes the only power source for the DC system, enabling uninterrupted power supply for important DC equipment such as protection devices and trip coils. isolation to prevent the accident from expanding. Therefore, the operation and maintenance of the battery and related tests are a very important work in the substation. Only by regularly conducting maintenance inspections and related tests on the battery can we understand and maintain the performance of the battery's stored electrical energy.

At present, most of the battery cell voltage measurement needs to be measured manually with a multimeter every week. This kind of measurement task is frequent and requires a lot of manpower and time. In addition, the battery charge and discharge test is an important test method to verify the actual capacity of the battery pack, but this This kind of test is currently carried out by professionals in the maintenance team. Each test group of batteries needs to carry a lot of heavy test equipment, and the wiring is complicated. The test time is as long as 10 hours, which consumes a lot of manpower and material resources.

Therefore, it is necessary to develop a battery on-line self-maintenance system capable of real-time state monitoring and regular self-maintenance tests.

Utility model content

In order to solve the above-mentioned problem, the concrete technical scheme that the utility model adopts is as follows:

An on-line self-maintenance system for a battery includes a low-voltage AC system and a DC charger, the low-voltage AC system is connected to an input end of a DC charger, an output end of the DC charger is connected to a DC bus, and the DC bus is connected to a battery pack, the The battery is connected in series by 104 single cells. The first and second single cells of the battery are connected through the first intelligent switch. The positive pole of the first single cell is connected to the positive pole of the test bus through the first intelligent switch. The negative pole of the single battery is connected to the negative pole of the test bus through one or two smart switches, and so on. The connection method of the remaining 103 single cells is the same. The described charging circuit is composed of the first intelligent switch, the DC charging power supply and the ammeter A in series, the described discharging circuit is composed of the second intelligent switch, the ammeter B and the adjustable discharge resistance in series, and the described voltmeter circuit is composed of the voltmeter ; The first intelligent switch, the first intelligent switch, the first two intelligent switches, the first intelligent switch, the second intelligent switch, the voltmeter, the ammeter A, the ammeter B, and the adjustable discharge resistance are connected to the control center.

The positive terminal of the first single cell is connected to the isolation bypass through the first three intelligent switches, the positive terminal of the second single cell is connected to the isolation bypass through the second three intelligent switches, and the remaining 102 single cells are connected to the isolation bypass. In the same way, the first and third smart switches and the second and third smart switches are connected to the control center through the data acquisition card.

Each of the single cells is provided with a temperature sensor, the temperature sensor collects the temperature of the single cell, and the temperature sensor is connected to the control center through a data acquisition card.

The beneficial effects of the present utility model are:

Compared with the prior art: the present invention no longer needs to use measuring tools and test instruments to perform manual measurement and test work, on the one hand, the cost of manpower and material resources is greatly reduced; It can be greatly extended, and at the same time, the operating status of the battery can be checked in real time, and the abnormal outgoing line can be alarmed in time to ensure the absolute reliability of the DC backup power supply of the substation.

Description of drawings

FIG. 1 is a schematic diagram of the floating state of a battery in the prior art;

Figure 2 is a schematic diagram of the battery self-maintenance of the present invention;

Among them: 1 is the positive pole of the DC bus, 2 is the negative pole of the DC bus, 3 is the fuse, 4 is the battery, 5 is the inverter, 6 is the AC load, 7 is the DC load, 8 is the low-voltage AC system, and 9 is the DC charger. , 10 is the DC charging power supply, 11 is the voltmeter A, 12 is the voltmeter, 13 is the ammeter B, 14 is the adjustable discharge resistance, 15 is the positive pole of the test bus, 16 is the negative pole of the test bus, and 17 is the isolation bypass.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are Some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1-2, the current low-voltage AC system 8 transmits DC power to the positive pole 1 of the DC bus and the negative pole 2 of the DC bus through the DC charger 9. The positive output end of the DC charger 9 is connected to the positive pole of the DC bus, and the The negative output terminal is connected to the negative pole of the DC bus. The DC load 7 on the DC bus is connected in parallel to the positive and negative poles of the DC bus, which can work with the DC power provided on the DC bus. The inverter 5 is connected to the positive and negative poles of the DC bus, and the AC load 6 is connected to The inverter 5 and the AC load 6 convert the DC power into matching AC power through the inverter 5 to provide the AC load 6 with working power. After the battery 4 is connected in series, the series fuse 3 is connected to the DC bus, and the DC bus charges the battery 4 .

The invention transforms and upgrades the original DC system battery on the basis of the existing technology, adds a test bus, ancillary test equipment and an intelligent switch, the intelligent switch is connected to the control center through a wired way, and the control center can control the state and reading of the switch through the terminal equipment. Take the switch status, monitor the electrical quantity information of each battery in real time through the monitoring instrument on the test bus, and set the parameters in advance, the device will regularly actuate the corresponding switches according to the predetermined program in sequence, and isolate the single battery one by one in order to test the battery. Reliable performance.

The battery 4 is composed of 104 single cells in series, and the voltage of each single cell is 2.2V. A first intelligent The switch K1, the second intelligent switch K2 is added between the second single cell T2 of the battery 4 and the third single cell T3 of the battery 4, and so on.

The positive and negative electrodes of each single cell of the battery 4 are respectively connected to the test bus through the intelligent switch, the positive terminal of the single cell T1 is connected to the positive terminal 15 of the test bus through the first intelligent switch K11, and the negative terminal of the single cell T1 is connected to the test bus through the first intelligent switch K11. The first and second smart switches K12 are connected to the negative electrode 16 of the test bus bar, and so on, so that the positive and negative electrodes of the 104 single cells are connected to the positive and negative electrodes of the test bus bar through the smart switch respectively. A loop, B loop and C loop are arranged on the test bus positive pole 15 and the test bus negative pole 16. The A loop is composed of the first intelligent switch KI, the DC charging power supply 10 and the ammeter A 11 in series, and the B loop is the second intelligent switch KII, The ammeter B 13 and the adjustable discharge resistance 14 are connected in series, and the C loop is composed of the voltmeter 12. In order to ensure that the battery 4 can be charged and discharged normally during the test, an isolation bypass 17 is set in the system. The first three smart switches K13 are added between the positive electrode of the single cell T1 and the isolation bypass 17, and the second and third smart switches K13 are passed between the rear end of the first smart switch K1 and the positive front end of the second single cell T2 of the battery 4. The intelligent switch K23 is connected to the isolation bypass 17, and is connected to the isolation bypass 17 through the third three intelligent switches K33 between the rear end of the second intelligent switch K2 and the positive front end of the third single cell T3 of the battery 4 , and so on, so that the positive poles of the 104 single cells are all connected to the isolation bypass 17 .

A temperature sensor is arranged on each single cell of the battery 4 to monitor the temperature of the single cell in real time, and the temperature value is sent to the control through the data acquisition card for monitoring; each intelligent switch sends the switch status signal to the control The center monitors the switch states of the switches in real time; the control center issues action commands in sequence according to the set program, and the corresponding intelligent switches make the specified actions in sequence and return the switch position signal, test the voltmeter in the A, B, C test loops of the bus bar , ammeter A, ammeter B, and the meter data of the adjustable discharge resistance device are aggregated through the data acquisition card and then connected to the communication channel. The communication channel is connected to the control center, and the collected values are sent to the control center in real time. The data is used to determine the test results in the program, and the test results are output to the display and memory, and the test results can be printed out through the printer. If the test is qualified, start the next battery test program until it is all over; if the test fails or the battery temperature abnormal signal is issued, an alarm signal will be output. The alarm signal can be connected to the local alarm device, and the local alarm device can give sound and light alarms If it indicates that the test is unqualified, it can also be connected to the centralized monitoring system of the equipment, connected to the background machine alarm system and the station control network alarm system, to monitor the alarm information in real time in the background machine and the remote dispatching system.

Taking the first single cell T1 in the battery 4 as an example, the test method is described in detail: disconnect the first intelligent switch K1, then close the first and third intelligent switches K13 and the second and third intelligent switches K23. , so that the first single cell T1 is independent from the battery pack, and the battery packs behind the single cell T2, the single cell T3, the single cell T4, etc. pass through the second and third smart switches K23, isolation bypass 17, second The three intelligent switches K23 and fuse 3 are connected to the positive pole 1 of the DC bus, which does not affect the normal charging and discharging of the remaining battery packs. Close the first one smart switch K11 and the first two smart switches K12, so that the single cell T1 is disconnected from the battery pack and connected to the DC test bus; after the single cell T1 is connected to the test bus to start the discharge test procedure, the switch KII is closed. On, according to the input discharge mode and discharge current value, the resistance value of the discharge resistor is automatically adjusted, so that the discharge B circuit can perform the discharge test according to the setting. When the discharge procedure of the single battery T1 is completed, the second intelligent switch KII is disconnected, the discharge circuit is disconnected, the first intelligent switch KI is closed, the charging circuit A is connected to the test bus, and the constant current charging procedure is executed. A charging test is to be carried out. During the test, the voltage on the test bus, that is, the voltage of the single cell T1 to be tested, can be monitored in real time through the circuit C, and the method for testing other 103 cells is the same.

The following are the tested single battery items and maintenance methods:

Single battery voltage measurement: When a single battery is connected to the test bus, the voltmeter 12 in the C loop of the test bus monitors the test bus voltage in real time, that is, the voltage of the single battery connected to the test bus.

Single battery temperature monitoring: Each single battery is equipped with a temperature sensor. The temperature sensor collects the temperature of the single battery. After summarizing the temperature value, it is input to the control center, and then output to the display terminal for storage and viewing.

Single battery internal resistance measurement: During the execution of the battery discharge procedure, the internal resistance value of the single battery can be calculated according to the values of the ammeter B 13, the adjustable discharge resistance 14, and the voltmeter 12. The specific formula is: R = V/A-R (R is the resistance value of the adjustable discharge resistor 14).

Constant current charging: Set the charging method as constant current charging and charging current value in the control center through the input device. After the discharge test of a single battery is completed, the second intelligent switch KII is disconnected, the discharge circuit is disconnected, and the first intelligent switch is disconnected. The switch KⅠ is closed, the charging circuit A is connected to the test bus, and the constant current charging procedure is performed. At this time, the DC charging power supply 6 performs constant current charging on this single battery with the set constant charging current, and the next procedure is performed after the charging is completed. .

Constant voltage charging: Set the charging method as constant voltage charging and charging voltage value in the control center through the input device. After the discharge test of a battery is completed, the second intelligent switch KII is disconnected, the discharge circuit is disconnected, and the first intelligent switch KⅠ Closed, the charging circuit A is connected to the test bus, and the constant current charging procedure is performed. At this time, the DC charging power supply 6 performs constant current charging on this battery with the set constant charging voltage, and the next procedure is performed after the charging is completed.

Constant current discharge: When a single battery is connected to the test bus and the discharge procedure is started, the second intelligent switch KII is closed, the discharge circuit B is connected, and the constant current discharge procedure is executed. At this time, the adjustable discharge resistance 14 will be adjusted according to the ammeter B13 The current value is automatically adjusted, so that the discharge B circuit always discharges with the set constant discharge current value, and the next step is performed after the discharge is completed.

Constant resistance discharge: When a battery is connected to the test bus and the discharge procedure is started, the switch KII is turned on, the discharge B circuit is turned on, and the constant current discharge procedure is executed. Automatic adjustment, so that the discharge B circuit always discharges with the set constant discharge resistance value, and the next procedure is carried out after the discharge is completed.

High current discharge: When a battery is connected to the test bus and the discharge procedure is started, the switch KII is closed, the discharge B circuit is connected, and the constant current discharge procedure is executed. Adjust so that the discharge B circuit always discharges at the set larger constant discharge current value, and the next step is performed after the discharge is completed.

Pulse discharge: When a battery is connected to the test bus and the discharge procedure is started, the switch KII is turned on, the discharge B circuit is turned on, and the constant current discharge procedure is executed. At this time, the adjustable discharge resistance 14 will be automatically Adjust to make the discharge B circuit discharge with the set pulse discharge current value, and then proceed to the next step after the discharge is completed.

Step-by-step charge and discharge: set in the settings, and automatically adjust the discharge current and charging current according to the battery voltage drop and recovery, so that the discharge and charging speed are changed from fast to slow, making the battery charging and discharging safer.

Single battery activation: Set it in the settings, and automatically start the activation program on a regular basis. After starting, the single battery is continuously charged and discharged several times to achieve the purpose of battery activation.

Claims (3)

1. A battery online self-maintenance system, comprising a low-voltage AC system and a DC charger, characterized in that: the low-voltage AC system is connected to the input end of the DC charger, the output end of the DC charger is connected to a DC bus, and the DC bus is connected to Battery pack, the battery is connected in series by 104 single cells, the first and second single cells of the battery are connected through a first intelligent switch, and the positive pole of the first single cell is connected through the first intelligent switch The positive pole of the test bus, the negative pole of the first single battery is connected to the negative pole of the test bus through one or two smart switches, and so on, the connection method of the remaining 103 single cells is the same, and the positive pole of the test bus and the negative pole of the test bus are connected in parallel with a voltmeter loop, charging circuit and discharge circuit, the charging circuit is composed of the first intelligent switch, the DC charging power supply and the ammeter A in series, the discharge circuit is composed of the second intelligent switch, the ammeter B and the adjustable discharge resistance in series, the voltage The meter circuit consists of a voltmeter; the first intelligent switch, the first intelligent switch, the first second intelligent switch, the first intelligent switch, the second intelligent switch, the voltmeter, the ammeter A, the ammeter B, the adjustable discharge resistance Connect to the control center through the data acquisition card. 2 . The battery online self-maintenance system according to claim 1 , wherein: the positive terminal of the first single cell is connected to an isolation bypass through the first three smart switches, and the second single cell is connected to an isolation bypass. 3 . The positive terminal of the battery is connected to the isolation bypass through the second and third intelligent switches, and the other 102 single cells are connected in the same way. The first and third intelligent switches and the second and third intelligent switches are connected to the control center through the data acquisition card. 3 . The battery online self-maintenance system according to claim 1 , wherein: each single cell is provided with a temperature sensor, the temperature sensor collects the temperature of the single cell, and the temperature sensor is connected through a data acquisition card. 4 . to the control center.

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