CN111342534A - Storage battery discharge control system and control method thereof - Google Patents

Storage battery discharge control system and control method thereof Download PDF

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Publication number
CN111342534A
CN111342534A CN202010221737.1A CN202010221737A CN111342534A CN 111342534 A CN111342534 A CN 111342534A CN 202010221737 A CN202010221737 A CN 202010221737A CN 111342534 A CN111342534 A CN 111342534A
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CN
China
Prior art keywords
storage battery
battery pack
discharge
discharging
monitoring device
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Pending
Application number
CN202010221737.1A
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Chinese (zh)
Inventor
付永健
李亮
赵永浩
刘海燕
曹俊超
赵永刚
胡兆宏
赵洋
王珊珊
马丹
宋丹
张瑞
耿飞
王建平
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Luohe Power Supply Company State Grid Henan Electric Power Co
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Luohe Power Supply Company State Grid Henan Electric Power Co
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Priority to CN202010221737.1A priority Critical patent/CN111342534A/en
Publication of CN111342534A publication Critical patent/CN111342534A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04Regulation of charging current or voltage
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • H01M10/443Methods for charging or discharging in response to temperature
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention belongs to the technical field of storage battery charging and discharging, and particularly relates to a storage battery discharging control system and a control method. The monitoring device controls the charging module to charge the storage battery pack so that the storage battery pack charges the bus, and the monitoring device simultaneously controls the storage battery and the inverter to perform discharging operation.

Description

Storage battery discharge control system and control method thereof
Technical Field
The invention belongs to the technical field of storage battery charging and discharging, and particularly relates to a storage battery discharging control system and a control method thereof.
Background
At present, storage batteries generally adopted by power plants and substations serve as direct-current operating power supplies, and under the condition that the power plants and substations break down or even the rectified power supply completely disappears, a storage battery direct-current system can still reliably work, so that the power supply reliability of the direct-current system is effectively guaranteed. In addition, because the voltage of the storage battery is stable and the capacity is large, the storage battery can provide large impact current when the breaker is switched on and can be used as a standby power supply of accident safety loads.
When the storage battery pack runs for a certain time, the discharge treatment is needed, the capacity of the storage battery pack is checked, and whether unqualified batteries exist is checked. The battery capacity Q test utilizes the product of the battery 10 hour discharge rate I10fd and the number of discharge time hours tfd.
A single group of storage battery packs is generally installed in a 110kV voltage class transformer substation, and two groups of storage battery packs are generally installed in a 220kV or higher voltage class transformer substation.
The power industry commonly adopts a load type discharge technology to carry out a storage battery checking discharge test and find out the problems of a storage battery pack and a single battery.
One end of a discharge bus is connected with a battery pack, the other end of the discharge bus is connected with a discharge switch, the discharge switch is connected with a discharge instrument, discharge parameters are set in the discharge instrument in advance, the single group of storage battery pack carries out check discharge, only 50% of capacity needs to be discharged, discharge current 0.1CA (C battery pack capacity) is set, discharge end voltage 1.80 × N V (N is the number of batteries) is set, discharge time is set for 5 hours, voltage, discharge current and load current of the whole group of storage battery pack are detected in the discharge process, voltage (the whole group and the single group) and current and resistance need to be measured and recorded every hour, the measurement process is very slow, the measurement needs more than 20 minutes, and the next measurement starts immediately after the measurement is finished.
When two groups of storage batteries are discharged, the operation mode needs to be adjusted, the bus-bar switch is switched on, two sections of direct current buses run in parallel, the charging switch is switched off, the storage battery pack needing to be discharged stops running, the direct current system is withdrawn, full-capacity check charging and discharging of the storage battery pack are carried out, the parameters of the discharging instrument are set, namely, the discharging current is set to be 0.1CA, the discharging termination voltage is set to be 1.80 × N V, the discharging time is set to be 10 hours, the voltage, the discharging current and the resistance need to be measured every hour in the discharging process, and the workload is large.
The principle of discharging by using a discharging instrument is that a ceramic resistor is used as a discharging element, electric energy is converted into heat energy to be released into the air, so that the electric energy is wasted, the purposes of green, energy saving and environmental protection are mutually contradicted, the whole process needs manual operation, measurement and recording are carried out every hour, the discharging time is long, and the process is complicated.
Patent document CN 102545277A discloses a battery charging and discharging system. The commercial power complementary inverter is connected with the charger, the charger is connected with the storage battery pack II, and the commercial power complementary inverter is further connected with a 220V power supply. The storage battery charging and discharging system has the following problems: 1. if no commercial power is available, the first storage battery pack is converted into alternating current through the inverter and charges a charger, the charger charges a second storage battery, and as a result, the second storage battery pack is charged by the battery charger, and the second storage battery pack has no meaning; 2. if the commercial power exists, the commercial power supplies power to the charger through the inverter, the charger charges the storage battery pack II, then the inverter charges the storage battery pack I, and the middle inverter does not play any role; 3. the system discharges by using the storage battery pack I, and charges the storage battery pack II through the inverter and the charger. The discharge rate of the storage battery is 10 hours, the discharge current is large, the storage battery pack II is in a floating charge state during operation, the electric quantity is sufficient, and only a small charge current needs to be maintained, so that the electric quantity of the storage battery pack I cannot be discharged, or the storage battery pack II is overcharged, the storage battery pack II can be damaged, and the service life of the storage battery pack is shortened.
Patent document CN 108233478A discloses an online charging and discharging system for communication storage batteries, which realizes online active equalization inside a communication storage battery pack when the communication storage battery is charged and discharged online, so as to avoid the situations of overcharge, overdischarge and insufficient charge of single batteries. The patent describes that when the storage battery pack discharges, a charger is connected in parallel with a single storage battery with lower capacity in the storage battery pack so as to slow down the discharge speed of the single storage battery with lower capacity and ensure that all the single batteries in the storage battery pack complete discharge at the same time; when the storage battery pack is charged, the control system controls the switch network to connect the electronic power load in parallel to the single storage battery with lower capacity in the storage battery pack so as to slow down the charging speed of the single storage battery with lower capacity and ensure that all the single batteries in the storage battery pack are charged simultaneously, thereby realizing active equalization of online discharge. The patent technology focuses on the regulation and control of the single batteries, the battery charger with low capacity is connected in parallel, the discharging speed of the battery charger is slowed down, timely processing or replacement is not carried out, and when large impact currents such as electromagnetic switching-on and the like occur in the system, the large accidents such as switching-on and non-equal switching-on can be caused due to the fact that the battery with low capacity is not replaced timely. Secondly, the discharge system cannot discharge remotely, and is not highly automated.
Disclosure of Invention
The invention aims to provide a storage battery pack discharge control system and a storage battery pack discharge control method aiming at the problems in the prior art, the system can realize near-end discharge operation, can also realize a discharge process through remote control of the Internet of things, is automatic in processing, saves manpower, monitors the discharge parameters of the storage battery pack in real time, and is high in precision.
The technical scheme of the invention is as follows:
a storage battery pack discharge control system comprises a storage battery pack, an inverter, a monitoring device, a rectification power supply and a monitoring device, wherein the storage battery pack is connected with a direct current bus, the direct current bus is connected with a direct current load, the inverter is connected with the storage battery pack, the rectification power supply is connected with the alternating current load, the rectification power supply is connected with the storage battery pack through a charging module, the charging module is further connected with the direct current bus and the monitoring device, and the monitoring device is connected with the storage battery pack.
The monitoring device controls the charging module to charge the storage battery pack, so that the storage battery pack charges the direct current bus through a discharging switch and a bus switch, and the monitoring device simultaneously controls the storage battery and the inverter to perform discharging operation.
The optical-mechanical-communication monitoring system comprises a communication manager, an optical machine and a background server, wherein the communication manager, the optical machine and the background server are sequentially connected, the communication manager is in communication connection with the optical machine through a cable, and the optical machine is in communication connection with the background server through an optical fiber.
The monitoring device comprises a storage battery pack and a monitoring device, and is characterized by further comprising an acquisition module, wherein the acquisition module is respectively connected with the storage battery pack and the monitoring device and used for acquiring and transmitting voltage information of the storage battery pack.
Specifically, the inverter is connected with the discharge bus through the discharge switch, the rectification power supply is connected with the discharge bus through the charge switch, and the rectification power supply is connected with the direct current bus through the bus switch.
Specifically, the discharge switch, the charge switch and the bus switch are all remote control switches.
The discharge control method of the storage battery pack discharge control system is suitable for the near-end discharge condition, and comprises the following steps:
s1, the rectified power supply is quitted from running;
s2, the monitoring device monitors the capacity of the storage battery pack and load current real-time data and calculates discharge parameters, the monitoring device sets the average charge current and the floating charge current of the storage battery pack, the inverter sets the discharge current value, and the discharge time T is set to be 10 hours or 5 hours;
s3, switching on a discharge switch, starting an inverter to start discharging, keeping a discharge current constant in the discharging process, observing whether the appearance and the site environment temperature of the storage battery pack are abnormal or not, recording the terminal voltage of the storage battery pack, the voltage of a single storage battery and the site environment temperature once per hour, collecting and transmitting the voltage information of the storage battery pack by using a collection module, and stopping discharging when the voltage of any single storage battery is reduced to a termination voltage value;
and S4, immediately disconnecting the discharge switch after the discharge of the storage battery pack is ended, starting the rectification power supply, enabling the charging module to enter a uniform charging state, and converting to a floating charging state after the charging is finished.
Specifically, in the equalizing charge process of step S3, when the temperature of the battery pack exceeds 40 ℃, the equalizing charge current should be reduced.
The control method of the storage battery pack discharge control system is suitable for controlling the discharge condition based on the remote end of the Internet of things, and comprises the following steps:
s1, the operation and maintenance personnel carry out discharging operation through the monitoring platform, firstly, the monitoring device monitors the capacity and load current real-time data of the storage battery pack and transmits the data to the monitoring platform through the communication manager, the optical machine and the background server, then the monitoring platform sets a discharging parameter according to the received data and transmits the discharging parameter back to the monitoring device, and meanwhile, the monitoring platform sets a discharging current value and sets the discharging time to be 10 hours or 5 hours;
s2, switching on a discharge switch, controlling the inverter to perform discharge action by the monitoring device according to the received discharge parameters, keeping the discharge current constant in the discharge process, observing whether the appearance of the storage battery pack is abnormal or not and the site environment temperature, recording the terminal voltage of the storage battery pack, the voltage of a single storage battery and the site environment temperature once per hour, collecting and transmitting the voltage information of the storage battery pack by using a collection module, and stopping discharge when the voltage of any single storage battery is reduced to the termination voltage;
and S3, immediately disconnecting the discharge switch after the discharge of the storage battery pack is ended, starting the rectification power supply, enabling the charging module to enter a uniform charging state, and converting to a floating charging state after the charging is finished.
Specifically, the discharge current value is 0.1CA minus the load current, where C is the battery capacity.
The storage battery pack is generally formed by connecting a plurality of single storage batteries in series, for example, 24 single storage batteries are 2V or 8 single storage batteries are 6V or 4 single storage batteries are 12V, at present, a plurality of methods for using, maintaining and detecting the communication storage batteries are provided, but in the use process of the storage batteries, due to the reasons of the capacity, the service time (the age), the consistency difference of the single batteries, the different loads of communication facilities or base station equipment and the like of the storage battery pack, the working states of the storage batteries are different, once the commercial power is stopped and cut off, the service time of the storage batteries is difficult to accurately estimate, and the use, maintenance and management work is difficult. The method comprises the following steps of obtaining data such as discharge voltage, current and the like of a storage battery at different temperatures through periodic or aperiodic charge-discharge tests of a storage battery pack, and storing the data in a system; when the commercial power is stopped or cut off, the storage battery network management system compares the storage battery parameters transmitted by the detection circuit in real time with the historical data, and can accurately predict the working time of the storage battery.
At present, the power industry commonly adopts a load type discharge technology to carry out a storage battery checking discharge test and find out the problems of a storage battery pack and a single battery. In the practical process, the method has the defects of complex operation, large workload, potential heating safety hazard and the like.
The invention has the beneficial effects that: the invention relates to a storage battery pack, which is connected with a direct current bus, the direct current bus is connected with a direct current load, the storage battery pack also comprises an inverter connected with the storage battery pack, the inverter is simultaneously connected with a monitoring device and a rectification power supply, the rectification power supply is connected with the alternating current load, the rectification power supply is connected with the storage battery pack through a charging module, the charging module is also connected with the direct current bus and the monitoring device, and the monitoring device is simultaneously connected with the storage battery pack; the monitoring device can be connected with a remote control system for remote control according to actual needs; the rectifier power supply supplies power to the alternating current load by the electricity discharged by the storage battery on one hand, and converts the electricity into direct current through the charging module on the other hand, the charging module charges the storage battery and supplies power to the direct current bus, the monitoring device controls the charging module to charge the storage battery through the charging module, so that the storage battery charges to the bus, and the monitoring device simultaneously controls the storage battery and the inverter to discharge through the inverter arranged on the storage battery discharging loop, so that the direct current discharged by the storage battery is converted into alternating current for the alternating current load to utilize, thereby saving electric energy and avoiding waste.
In addition, the voltage of a single battery of the storage battery pack is collected through the collecting module and transmitted to the monitoring device to the monitoring platform, the discharging process is automatically processed through remote control, manpower is saved, the discharging parameters of the storage battery pack are monitored in real time, and the precision is high.
The invention also provides a discharge control method of the system, the method can flexibly control the discharge control of the storage battery, the near-end discharge operation can be realized according to the monitoring of the acquisition module on the information of the storage battery pack and the monitoring of the monitoring device, the discharge process can also be realized by remote control through the Internet of things, the automatic processing is realized, the labor is saved, the discharge parameters of the storage battery pack are monitored in real time, and the precision is high.
Drawings
Fig. 1 is a schematic structural diagram of a single-group battery pack near-end discharge system provided in embodiment 1;
FIG. 2 is a schematic diagram of the wiring of the near-end discharge system of a single battery pack provided in embodiment 1;
FIG. 3 is a schematic diagram of the wiring of the two groups of battery pack near-end discharge systems provided in example 2;
fig. 4 is a schematic diagram of a remote discharging system principle of a storage battery pack provided in embodiment 3 based on the internet of things;
fig. 5 is a schematic diagram of a wiring diagram of a remote discharging system based on the internet of things for a single battery pack provided in embodiment 3.
Fig. 6 is a schematic diagram of wiring of the remote discharging system based on the internet of things for two groups of storage batteries provided in embodiment 4.
1 bus switch, 2 charge switch, 3 discharge switch, 4 storage battery, 5 acquisition modules, 6 rectification power supply, 7 monitoring device, 8 inverter, 9 communication manager, 10 optical machine, 11I section bus switch, 12I section charge switch, 13I section discharge switch, 14I section storage battery, 15I section acquisition module, 16I section rectification power supply, 17I section monitoring device, 18I section inverter, 19 bus coupler switch, 20 background server, 21 II section bus switch, 22 II section charge switch, 23 II section discharge switch, 24 II section storage battery, 25 II section acquisition module, 26 II section rectification power supply, 27 II section monitoring device, 28 II section inverter, 29 DC bus, 30 discharge bus, 31I section bus, 32I section discharge bus, 33 II section bus, 34 II section discharge bus.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1 and fig. 2, a schematic structural schematic diagram and a wiring schematic diagram of a proximal end discharge system of a single group of storage battery pack of a storage battery pack discharge control system provided in this embodiment are provided, the storage battery pack 4 is connected to a dc bus 29, the dc bus 29 is connected to a dc load, the system further includes an inverter 8 connected to the storage battery pack 4, the inverter 8 is simultaneously connected to a monitoring device 7 and a rectification power supply 6, the rectification power supply 6 is connected to an ac load, the rectification power supply 6 is connected to the storage battery pack 4 through a charging module, the charging module is further connected to the dc bus 29 and the monitoring device 7, and the monitoring device 7 is simultaneously connected to the storage battery pack 4. The monitoring device is characterized by further comprising an acquisition module 5, wherein the acquisition module 5 is respectively connected with the storage battery pack 4 and the monitoring device 7 and is used for acquiring and transmitting voltage information of the storage battery pack 4.
The rectifier power supply 6 supplies the electricity discharged by the storage battery 4 to the alternating current load on one hand, and converts the electricity into direct current through the charging module on the other hand, the charging module charges the storage battery pack 4 and supplies the electricity to the direct current bus 29, the monitoring device 7 controls the charging module to charge the storage battery pack 4, so that the storage battery pack 4 charges the bus, and the monitoring device 7 simultaneously controls the storage battery pack 4 and the inverter 8 to perform discharging operation.
The inverter 8 is connected with a discharge bus 30 through a discharge switch 3, the inverter 8 is connected with a monitoring device 7 and is simultaneously connected with a rectification power supply 6, the rectification power supply 6 is connected with the discharge bus 30 through a charge switch 2, and the rectification power supply 6 is simultaneously connected with a direct current bus 29 through a bus switch.
In the present embodiment, since the single group of battery cells 4 is loaded when discharging, a load current is present. The storage battery pack 4 discharges electricity, converts direct current into alternating current through the rectifier power supply 6, supplies power to an alternating current load, and all released electric energy is input into the alternating current load, so that the electric energy utilization rate is high, and almost one hundred percent of electric energy is converted and utilized.
The discharge control method of the storage battery pack discharge control system provided by the embodiment is suitable for the near-end discharge condition, and comprises the following steps:
s1, the rectified power supply is quitted from running;
s2, the monitoring device monitors the capacity of the storage battery pack and load current real-time data and calculates discharge parameters, the monitoring device sets the average charge current and the floating charge current of the storage battery pack, the inverter sets the discharge current value, the discharge current value is 0.1CA minus the load current, wherein C is the storage battery capacity, as the single storage battery pack 4 in the embodiment needs to carry a load during discharge, the load current is a positive value, the discharge time T is set, and T is 10 hours;
s3, closing a discharge switch, starting an inverter to start discharging, keeping a discharge current constant in the discharging process, observing whether the appearance and the site environment temperature of the storage battery pack are abnormal or not, recording the terminal voltage of the storage battery pack, the voltage of a single storage battery and the site environment temperature once per hour, collecting and transmitting the voltage information of the storage battery pack by using a collecting module, stopping discharging when the voltage of any single storage battery is reduced to a termination voltage value, reducing the uniform charging current when the temperature of the storage battery pack 4 exceeds 40 ℃, and setting the termination voltage according to the voltage of a single battery, wherein the termination voltage is 1.8V if the temperature of the single battery pack is 2V;
and S4, immediately disconnecting the discharge switch after the discharge of the storage battery pack is ended, starting the rectification power supply, enabling the charging module to enter a uniform charging state, and converting to a floating charging state after the charging is finished.
And S4, immediately discharging the storage battery pack 4 after the discharge is finished, starting the rectification power supply 6 by the discharge switch 3, and turning the charging module into a uniform charging state to a floating charging state after the charging is finished.
The relationship between the field environment temperature and the output voltage value of the storage battery mentioned in the embodiment is △ V = (T-25) × (-3 mV) × N.
When the charging module normally operates, the rectifying power supply 6 supplies power to the charging module and the alternating current load, the charging module supplies power to the storage battery pack 4 in a floating mode on one hand, the direct current bus 29 supplies power to the direct current load on the other hand, the monitoring device 7 monitors the operating states of the charging module and the storage battery pack 4, the monitoring device 7 sets the uniform charging current and the floating charging current of the storage battery pack, and the discharging information and the uniform charging information of the storage battery pack are input according to the capacity of the storage battery pack 4. The discharging method has the disadvantage that a part of electric energy is wasted and cannot be fully utilized.
Example 2
The embodiment provides a near-end discharge control system for two groups of storage battery packs, and fig. 3 is a schematic diagram of a principle structure of a storage battery charge-discharge system provided by the embodiment. Two sections of buses are adopted to be connected with two groups of storage batteries, the two groups of storage batteries are a first section of storage battery pack 14 and a second section of storage battery pack 24 respectively, the storage batteries comprise a first section of storage battery pack 14 charging and discharging system and a second section of storage battery pack 24 charging and discharging system, and the connection mode of each storage battery pack is the same as that of the storage battery pack in the embodiment 1; the rectifying power supply also comprises two rectifying power supplies, namely a first-stage rectifying power supply 16 and a second-stage rectifying power supply 26; the monitoring devices are a first-stage monitoring device 17 and a second-stage monitoring device 27 respectively; the inverters are a section I inverter 18 and a section II inverter 28 respectively; the discharge system of the I section storage battery pack 14 is connected with the I section bus 31, the I section inverter 18 is connected with the I section discharge bus 32 through the I section discharge switch 13, the I section inverter 18 is also connected with the I section monitoring device 17 and the rectification power supply, the rectification power supply is connected with the I section rectification power supply 16, the I section rectification power supply 16 is respectively connected with the I section bus 31 and the I section discharge bus 32 through the I section bus switch 11 and the I section charge switch 12, and the I section acquisition module 15 is simultaneously connected with the I section storage battery pack 14 and the I section monitoring device 17; the charging and discharging system of the second section of storage battery pack 24 is connected with the second section of bus 33 in the same connection mode as the charging and discharging system of the first section of storage battery pack 17, and the first section of bus 31 is connected with the second section of bus 33 through the bus coupler switch 19. Due to the 2 groups of storage batteries, the battery pack can be discharged independently during discharging according to the 10-hour discharging rate.
Two battery discharge steps include, for example, the following steps for the II battery pack 24 to be discharged (as shown in FIG. 3):
and S1, adjusting the operation mode of the system to be discharging, closing the bus-coupled switch 19, and enabling the two direct current buses to operate in parallel.
S2, the rectified power supply 26 is quitted from operation;
s3, disconnecting the II-section bus switch 21;
s4, disconnecting the II-stage charging switch 22;
s5, setting discharge parameters, setting a discharge current value of 0.1CA minus load current in the section II inverter 28, wherein C is the storage battery capacity, because the embodiment is two groups of storage battery packs without load, the load current is zero, and the discharge time is set to be 10 hours without subtraction;
s6, closing the II-section discharge switch 23, starting discharging, keeping the discharge current constant in the discharge process, observing whether the appearance and the site temperature of the storage battery 24 are abnormal or not, recording the voltage of the 24 end of the storage battery pack and the voltage and the site temperature of a single storage battery once per hour, checking the measured voltage by using the II-section acquisition module, stopping discharging when the voltage of any single storage battery is reduced to a terminal voltage value, and reducing the uniform charge current when the temperature of the storage battery pack 4 exceeds 40 ℃;
s7, immediately disconnecting the discharge switch 23 after the discharge of the II-section storage battery pack 24 is ended, switching on the rectification power supply 26 to enable the rectification power supply 26 to operate, switching on the II-section charge switch 22, recording whether the voltage of the 24-end storage battery pack and the voltage and the temperature of a single storage battery are normal or not every 2 hours, and checking whether the charging device enters a floating charge state after the charging of the storage battery 24 is finished;
and S9, restoring the normal operation mode of the direct current system, switching on the second-section bus switch 21 and switching off the bus coupler switch 19.
Example 3
The embodiment provides a storage battery pack discharge control system based on the internet of things, as shown in fig. 4 and 5, the system provided by the embodiment is suitable for the situation that a single group of storage battery packs discharge and are remotely controlled, the system is different from the embodiment 1 in that the system comprises a remote control system connected with a monitoring device 7, the remote control system comprises a communication manager 9, an optical machine 10 and a background server 20 which are sequentially connected, the communication manager 9 is in communication connection with the optical machine 10 through a cable, and the optical machine 10 is in communication connection with the background server 20 through an optical fiber. The discharging switch 3, the charging switch 2 and the bus switch 1 are all remote control switches. The monitoring device 7 transmits the running state and the alarm information to the communication management machine 9, the communication management machine 9 transmits the running state and the alarm information to the optical machine 10, the running state and the alarm information are uploaded to the background server 20 through the optical machine 10, the background server 20 is connected with the monitoring platform through a network cable, and operation and maintenance personnel monitor the running state of the direct current system in real time. When the storage battery pack 4 needs to be discharged, the remote operation and maintenance personnel set the discharge parameters through the monitoring platform: for example, the discharge end voltage of a single battery, the discharge end voltage of the whole battery pack, the discharge current and the discharge time, after the parameters are set, the rectifying power supply 6 is closed, the discharge switch 3 is closed, and the inverter 8 is started to discharge. The storage battery pack 4 discharges electricity, converts direct current into alternating current through the rectifier power supply 6, supplies power to an alternating current load, and all released electric energy is input into the alternating current load, so that the electric energy utilization rate is high, and almost one hundred percent of electric energy is converted and utilized. When any one of the discharge parameters is reached, the storage battery pack 4 stops discharging immediately, the discharge switch 3 is monitored, the discharge switch 3 can be disconnected through a communication network, and the storage battery pack 4 is charged by the charging module until the charging is finished and is converted into a floating charge state.
The control method of the storage battery pack discharge control system provided by the embodiment is suitable for controlling the discharge condition based on the remote end of the internet of things, and specifically comprises the following steps:
s1, the operation and maintenance staff performs the discharging operation through the monitoring platform, first, the monitoring device monitors the capacity and load current real-time data of the storage battery pack 4 and transmits the data to the monitoring platform through the communication manager 9, the optical engine 10 and the background server 20, then the monitoring platform sets the discharging parameters according to the received data, and returns the discharging parameters to the monitoring device 7, and meanwhile, the monitoring platform sets the discharging current value: the discharging current value is 0.1CA minus the load current, and the single-group storage battery discharging system provided by the embodiment discharges with load, so that the load current is a positive value, and the discharging time is set to be 5 hours;
s2, switching on the discharge switch 3, controlling the inverter 8 to perform discharge action by the monitoring device 7 according to the received discharge parameters, keeping the discharge current constant in the discharge process, observing whether the appearance and the site temperature of the storage battery pack are abnormal or not, recording the terminal voltage of the storage battery pack and the voltage and the site temperature of a single storage battery once per hour, collecting and transmitting the voltage information of the storage battery pack by using a collection module, stopping discharge when the voltage of any single storage battery falls to the standard voltage value, considering the site temperature influence condition, the method is the same as that in the embodiment 1, and the description is not repeated;
and S3, immediately disconnecting the discharge switch 3 after the discharge of the storage battery pack 4 is ended, starting the rectification power supply 6, and turning the charging module into a uniform charging state to a floating charging state after the charging is finished.
Example 4
The embodiment provides a far-end discharging system for two groups of storage battery packs, and fig. 6 is a schematic structural diagram of a principle of a storage battery charging and discharging system provided by the embodiment. The connection mode is the same as that of embodiment 2, except that the embodiment is based on the internet of things, and two bus bars are connected with two groups of storage batteries, the connection mode comprises a remote control system connected with a monitoring device 7, the remote control system comprises a communication manager 9, an optical machine 10 and a background server 20 which are sequentially connected, the communication manager 9 is in communication connection with the optical machine 10 through a cable, and the optical machine 10 is in communication connection with the background server 20 through an optical fiber. The discharging switch 3, the charging switch 2 and the bus switch 1 are all remote control switches. The monitoring device 7 transmits the running state and the alarm information to the communication management machine 9, the communication management machine 9 transmits the running state and the alarm information to the optical machine 10, the running state and the alarm information are uploaded to the background server 20 through the optical machine 10, the background server 20 is connected with the monitoring platform through a network cable, and operation and maintenance personnel monitor the running state of the direct current system in real time. The two groups of storage battery groups are respectively a section I of storage battery pack 14 and a section II of storage battery pack 24, and comprise a section I of storage battery pack 14 charging and discharging system and a section II of storage battery pack 24 charging and discharging system, and the connection modes of the storage battery groups are respectively the same as that of the embodiment 2 and are shown in FIG. 6; the rectifying power supply also comprises two rectifying power supplies, namely a first-stage rectifying power supply 16 and a second-stage rectifying power supply 26; the monitoring devices are a first-stage monitoring device 17 and a second-stage monitoring device 27 respectively; the inverters are a section I inverter 18 and a section II inverter 28 respectively; the discharge system of the I section of storage battery is connected with the I section of bus 31, the I section of inverter 18 is connected with the I section of discharge bus 32 through the I section of discharge switch 13, the I section of inverter 18 is also connected with the I section of monitoring device 17 and the rectification power supply, the rectification power supply is connected with the I section of rectification power supply 16, the I section of rectification power supply 16 is respectively connected with the I section of bus 31 and the I section of discharge bus 32 through the I section of bus switch 11 and the I section of charge switch 12, and the I section of acquisition module 15 is simultaneously connected with the I section of storage battery 14 and the I section of monitoring device 17; the charging and discharging system of the second section of storage battery pack 24 is connected with the second section of bus 33 in the same connection mode as the charging and discharging system of the first section of storage battery pack 17, the first section of bus 31 is connected with the second section of bus 33 through the bus coupler switch 19, and the first section of monitoring device 17 and the second section of monitoring device 27 are communicated with the communication manager 9 at the same time. Due to the 2 groups of storage batteries, the battery pack can be discharged independently during discharging according to the 10-hour discharging rate.
The steps of the control method of the discharging system provided in this embodiment are the same as those of embodiment 2 when the discharging operation is performed on the first-segment storage battery pack 14, but the difference lies in the operation of the remote internet of things, and the discharging process of the first-segment storage battery pack 14 is performed on a background server, and the remote operation is performed, and the bus coupler switch 19 is turned on, all switches in the charging and discharging system of the second-segment storage battery pack 24 are turned off, the first-segment charging switch 12 of the first-segment storage battery pack 14 is turned off, the first-segment discharging switch 13 is turned on: the discharging current is 0.1CA, wherein C is the storage battery capacity, the set discharging time is 10 hours, the discharging current passes through the optical machine 20, the communication manager 9 and the I-section monitoring device 17 and is transmitted to the I-section inverter 18, the discharging is started, in the discharging process, the system automatically monitors the voltage and the discharging time of a single or whole group of storage batteries in the I-section storage battery 14 through the I-section acquisition module 15, one index reaches, the discharging is stopped, and the original operation mode is recovered.
The discharging process of the second section of storage battery pack 24 is the same as that of the first section of storage battery pack 14, remote operation is firstly carried out on a background server, the bus coupler switch 19 is switched on, all switches in the charging and discharging system of the first section of storage battery pack 14 are switched off, the second section of charging switch 22 of the second section of storage battery pack 24 is switched off, the second section of discharging switch 23 is switched on, and data are input at a monitoring background: the discharging current is 0.1CA, the discharging time is set to be 10 hours, the discharging current is transmitted to the II-section inverter 28 through the optical machine 20, the communication manager 9 and the II-section monitoring device 27 to start discharging, in the discharging process, the system automatically monitors the voltage and the discharging time of a single storage battery or a whole group of storage batteries in the II-section storage battery pack 24 through the II-section acquisition module 25, and when one index reaches the target, the discharging is stopped, and the original operation mode is recovered.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (9)

1. A storage battery pack discharge control system is characterized by further comprising an inverter connected with the storage battery pack, wherein the inverter is simultaneously connected with a monitoring device and a rectification power supply, the rectification power supply is connected with an alternating current load, the rectification power supply is connected with the storage battery pack through a charging module, the charging module is further connected with the direct current bus and the monitoring device, and the monitoring device is simultaneously connected with the storage battery pack;
the monitoring device controls the charging module to charge the storage battery pack, so that the storage battery pack charges the direct current bus through a discharging switch and a bus switch, and the monitoring device simultaneously controls the storage battery and the inverter to perform discharging operation.
2. The discharging control system of the storage battery pack according to claim 1, further comprising a remote control system connected with the monitoring device, wherein the remote control system comprises a communication manager, an optical machine and a background server which are sequentially connected, the communication manager is in communication connection with the optical machine through a cable, and the optical machine is in communication connection with the background server through an optical fiber.
3. The battery pack discharge control system according to claim 2, further comprising an acquisition module, wherein the acquisition module is respectively connected with the battery pack and the monitoring device, and is used for acquiring and transmitting voltage information of the battery pack.
4. The battery pack discharge control system of claim 3, wherein the inverter is connected to the discharge bus via a discharge switch, the rectified power supply is connected to the discharge bus via a charge switch, and the rectified power supply is connected to the dc bus via a bus switch.
5. The battery pack discharge control system of claim 4, wherein the discharge switch, the charge switch, and the bus switch are all remote controlled switches.
6. The discharge control method of a battery pack discharge control system according to claim 1, adapted for near-end discharge conditions, comprising the steps of:
s1, the rectified power supply is quitted from running;
s2, the monitoring device monitors the capacity of the storage battery pack and load current real-time data and calculates discharge parameters, the monitoring device sets the average charge current and the floating charge current of the storage battery pack, the inverter sets the discharge current value, and the discharge time T is set to be 10 hours or 5 hours;
s3, switching on a discharge switch, starting an inverter to start discharging, keeping a discharge current constant in the discharging process, observing whether the appearance and the site environment temperature of the storage battery pack are abnormal or not, recording the terminal voltage of the storage battery pack, the voltage of a single storage battery and the site environment temperature once per hour, collecting and transmitting the voltage information of the storage battery pack by using a collection module, and stopping discharging when the voltage of any single storage battery is reduced to a termination voltage value;
and S4, immediately disconnecting the discharge switch after the discharge of the storage battery pack is ended, starting the rectification power supply, enabling the charging module to enter a uniform charging state, and converting to a floating charging state after the charging is finished.
7. The control method of the battery pack discharge control system according to claim 6, wherein in the step S3, when the temperature of the battery pack exceeds 40 ℃, the equalizing charge current should be reduced.
8. The control method of the storage battery pack discharge control system according to claim 5, which is suitable for controlling discharge conditions based on the Internet of things remote end, and is characterized by comprising the following steps:
s1, the operation and maintenance personnel carry out discharging operation through the monitoring platform, firstly, the monitoring device monitors the capacity and load current real-time data of the storage battery pack and transmits the data to the monitoring platform through the communication manager, the optical machine and the background server, then the monitoring platform sets a discharging parameter according to the received data and transmits the discharging parameter back to the monitoring device, and meanwhile, the monitoring platform sets a discharging current value and sets the discharging time to be 10 hours or 5 hours;
s2, switching on a discharge switch, controlling the inverter to perform discharge action by the monitoring device according to the received discharge parameters, keeping the discharge current constant in the discharge process, observing whether the appearance of the storage battery pack is abnormal or not and the site environment temperature, recording the terminal voltage of the storage battery pack, the voltage of a single storage battery and the site environment temperature once per hour, collecting and transmitting the voltage information of the storage battery pack by using a collection module, and stopping discharge when the voltage of any single storage battery is reduced to the termination voltage;
and S3, immediately disconnecting the discharge switch after the discharge of the storage battery pack is ended, starting the rectification power supply, enabling the charging module to enter a uniform charging state, and converting to a floating charging state after the charging is finished.
9. The control method of a battery pack discharge control system according to claim 6 or 8, characterized in that the discharge current value is 0.1CA minus the load current, where C is the battery capacity.
CN202010221737.1A 2020-03-26 2020-03-26 Storage battery discharge control system and control method thereof Pending CN111342534A (en)

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