CN216121890U - Voltage balancing system for storage battery pack of traction substation - Google Patents
Voltage balancing system for storage battery pack of traction substation Download PDFInfo
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- CN216121890U CN216121890U CN202122724989.9U CN202122724989U CN216121890U CN 216121890 U CN216121890 U CN 216121890U CN 202122724989 U CN202122724989 U CN 202122724989U CN 216121890 U CN216121890 U CN 216121890U
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- 238000003860 storage Methods 0.000 title claims abstract description 51
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 27
- 230000001502 supplementing effect Effects 0.000 claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 239000010703 silicon Substances 0.000 claims abstract description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 6
- 238000007726 management method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The utility model discloses a voltage equalization system for a storage battery pack of a traction substation, which comprises: the rectifying charger is connected with a switching device Q1、Q2The single battery electricity supplementing unit comprises a supplementing DC/DC1 module, a change-over switch module and a two-way switch module, the supplementing DC/DC1 module is connected with the change-over switch module, the change-over switch module is connected with the storage battery module through the two-way switch module, the output end of the storage battery module is connected with a silicon link voltage reducing device, and the control module monitors the voltage of the storage battery moduleAnd controls the change-over switch module and the bidirectional switch module. According to the utility model, the on-off of the switch device is controlled, so that the complementary charging of the target single battery is realized, the original control structure is not changed as much as possible, and the operation risk of the direct current system is reduced to the maximum extent.
Description
Technical Field
The utility model relates to the technical field of standby power supplies of traction substations, in particular to a voltage balancing system for a storage battery pack of a traction substation.
Background
The direct current power supply in the traction substation mainly provides an operation power supply for equipment such as a circuit breaker, a closing loop/control loop of an isolating switch, a comprehensive self-protection device, emergency lighting, an inverter and the like, and is required to have higher power supply reliability. When the emergency state of the power loss of the alternating current power supply occurs, the storage battery pack is immediately converted into a main power supply from a floating charging state in normal operation, and the main power supply becomes the only guarantee for the stable operation of important equipment of the traction substation.
In recent years, accidents caused by direct-current power supply faults occur in traction substations in various places for many times, such as the conditions of abnormity of a relay protection device, operation failure of switch equipment and the like caused by failure of a storage battery pack, and the safe operation of the equipment is seriously threatened. Therefore, based on safety consideration, maintenance of the storage battery pack is enhanced, battery voltage balance control is put into a charging and discharging management mode, the service life of the storage battery pack can be prolonged, and risks are reduced for safe and stable operation of a traction substation.
The stable operation of the storage battery pack of the traction substation is an important guarantee of a direct-current power supply system, and the problems of the existing storage battery pack in charge and discharge operation that the management method is not scientific enough and the maintenance means is not convenient enough are specifically as follows:
(1) when the single battery leaves a factory, due to the influence of production and manufacturing processes, performance differences exist among individuals, when the storage battery is charged and discharged in series, the phenomenon of voltage imbalance can occur, and the storage battery has different internal resistances and capacity deviation due to long-term operation. Meanwhile, the phenomenon of overcharge and undercharge of the storage battery can be caused, particularly when the storage battery pack has two types of new and old storage batteries, the unbalance phenomenon is very serious, the voltages of the storage batteries are too high and too low, vicious circle of overcharge and undercharge states is caused, even irreversible reaction occurs, and the service life of the storage battery is seriously shortened;
(2) at present, the maintenance plan requires that a check charging and discharging test is carried out on the storage battery pack every year to check whether the capacity of the storage battery is normal or not, the whole test process consumes a long time, and the procedure is complex. Taking a certain traction substation as an example, at least 3 workers need to be equipped on a test site, if 0.1C10 discharge current is selected, a group of storage battery charge and discharge tests can be completed within 20 hours, and in the process, a specially-assigned person needs to monitor the test, and in addition, the flows of safety measures, operation preparation and the like are added, so that the checking charge and discharge test of one traction substation takes 2-3 days at least, and time and labor are wasted.
SUMMERY OF THE UTILITY MODEL
In order to improve the battery uniformity and the maintenance management level of the storage battery pack, the utility model provides a voltage equalization system of the storage battery pack of a traction substation.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a traction substation battery pack voltage equalization system, comprising:
the rectifying charger is connected with a switching device Q1、Q2The single battery electricity supplementing unit comprises a supplementing DC/DC1 module, a change-over switch module and a bidirectional switch module, wherein the supplementing DC/DC1 module is connected with the change-over switch module, the change-over switch module is connected with the storage battery module through the bidirectional switch module, the output end of the storage battery module is connected with a silicon link voltage reduction device, and the control module monitors the voltage of the storage battery module and controls the change-over switch module and the bidirectional switch module;
the change-over switch module comprises a first bridge arm and a second bridge arm which are connected in parallel, wherein a switch P is arranged on the first bridge arm in series1、P2The second bridge arm is provided with a switch P in series3、P4The battery pack module comprises 9 batteries C connected in seriesiI is more than or equal to 1 and less than or equal to 9, and the bidirectional switch module comprises 10 bidirectional switches SjJ is more than or equal to 0 and less than or equal to 9, and a storage battery CkPositive pole of the switch Sk-1First terminal of (1), storage battery CkNegative pole of (2) is connected with a bidirectional switch SkK is more than or equal to 1 and less than or equal to 9, and the second end of the bidirectional switch with odd subscript is connected with the switch P3、P4A second end of the bidirectional switch with even subscript is connected with the switch P1、P2In the meantime.
Preferably, the change-over switch module further comprises a third bridge arm connected in parallel with the first bridge arm and the second bridge arm, and a switch P is arranged in series on the third bridge arm0And a resistance R.
Preferably, the control module comprises an ADC sampling module and a DSP processing module.
Preferably, the switching device Q1、Q2Is a thyristor switching device.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model aims at the existing storage battery management mode of a direct current system of a traction substation, analyzes the problems of operation and maintenance, provides a single supplementary power scheme for improving the voltage balance of the battery, improves the traditional maintenance means of the storage battery on the basis, and realizes the sequential discharge test of the single batteries by using the modes of modular signal acquisition, logic judgment and program control. The improved storage battery management method mainly utilizes the existing charge-discharge loop, increases monomer supplementary electric control and signal cables, has stronger applicability to the current equipment, is beneficial to prolonging the service life of the battery, and effectively improves the overall management level of the storage battery.
Drawings
For a clearer explanation of the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a traction substation battery pack voltage equalization system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a traction substation battery pack voltage equalization system includes: the rectifying charger is connected with a switching device Q1、Q2Respectively connected with a storage battery module, a single battery supplementary power unit and a switching device Q1、Q2Being thyristor switching devices, switching devices Q1、Q2And respectively controlling the input and the cut-off of the storage battery pack module and the single battery supplementary power unit.
The single battery electricity supplementing unit comprises a supplementing DC/DC1 module, a change-over switch module and a bidirectional switch module, wherein the supplementing DC/DC1 module is connected with the change-over switch module, and the power supply voltage of the rectifying charger is converted into the rated voltage of the single battery through the supplementing DC/DC1 module. The change-over switch module is connected with the storage battery pack module through the bidirectional switch module, the output end of the storage battery pack module is connected with the silicon chain voltage reducing device, the control module comprises an ADC (analog to digital converter) sampling module and a DSP (digital signal processor) processing module, and the control module monitors the voltage of the storage battery pack module and controls the change-over switch module and the bidirectional switch module to form a switch array to realize charging of a target single storage battery.
The change-over switch module comprises a first bridge arm and a second bridge arm which are connected in parallel, wherein a switch P is arranged on the first bridge arm in series1、P2The second bridge arm is provided with a switch P in series3、P4The battery pack module comprises 9 batteries C connected in seriesiI is more than or equal to 1 and less than or equal to 9, and the bidirectional switch module comprises 10 bidirectional switches SjJ is more than or equal to 0 and less than or equal to 9, and a storage battery CkPositive pole of the switch Sk-1First terminal of (1), storage battery CkNegative pole of (2) is connected with a bidirectional switch SkK is more than or equal to 1 and less than or equal to 9 at the first end of the first switch. Bidirectional switch (S) with odd subscript1、S3、S5、S7、S9) The second end is connected with the switch P3、P4A bidirectional switch (S) having an even index0、S2、S4、S6、S8) The second end is connected with the switch P1、P2In the meantime.
In the normal float charging operation process of the storage battery pack, voltage signal acquisition of the single storage battery is carried out through the ADC module, and when voltage imbalance occurs, Q is closed2And the DSP processing module is used for carrying out logic judgment, and a switch array formed by the selector switch and the bidirectional switch is selected to realize the charging of the target single battery. For example when P1、P4And S0、S1When the single battery C is conducted, the first single battery C can be conducted1The specific battery charging switch array is shown in table 1.
TABLE 1 Battery supplement electric switch array
The utility model arranges a low-power discharge resistor R and a discharge loop switch P in a change-over switch module3The storage battery single batteries can be discharged one by sequentially switching on the switch arrays shown in the table 1, and the whole process uses the DSP control module to automatically operate, so that the operation is convenient and flexible. For example, a closed discharge loop switch P0Change-over switch P1、P4And a bidirectional switch S0、S1The first battery C can be realized1Discharge test of (4).
According to the utility model, the on-off of the switch device is controlled, so that the complementary charging of the target single battery is realized, the original control structure is not changed as much as possible, and the operation risk of the direct current system is reduced to the maximum extent.
Claims (4)
1. A traction substation storage battery pack voltage equalization system is characterized by comprising:
the rectifying charger is connected with a switching device Q1、Q2The single battery electricity supplementing unit comprises a supplementing DC/DC1 module, a change-over switch module and a bidirectional switch module, wherein the supplementing DC/DC1 module is connected with the change-over switch module, the change-over switch module is connected with the storage battery module through the bidirectional switch module, the output end of the storage battery module is connected with a silicon link voltage reduction device, and the control module monitors the voltage of the storage battery module and controls the change-over switch module and the bidirectional switch module;
the change-over switch module comprises a first bridge arm and a second bridge arm which are connected in parallel, wherein a switch P is arranged on the first bridge arm in series1、P2The second bridge arm is provided with a switch P in series3、P4The battery pack module comprises 9 batteries C connected in seriesiI is more than or equal to 1 and less than or equal to 9, and the bidirectional switch module comprises 10 bidirectional switches SjJ is more than or equal to 0 and less than or equal to 9, and a storage battery CkPositive pole of the switch Sk-1First terminal of (2), storage batteryCkNegative pole of (2) is connected with a bidirectional switch SkK is more than or equal to 1 and less than or equal to 9, and the second end of the bidirectional switch with odd subscript is connected with the switch P3、P4A second end of the bidirectional switch with even subscript is connected with the switch P1、P2In the meantime.
2. The traction substation battery pack voltage equalization system of claim 1, wherein: the change-over switch module also comprises a third bridge arm connected with the first bridge arm and the second bridge arm in parallel, and a switch P is arranged on the third bridge arm in series0And a resistance R.
3. The traction substation battery pack voltage equalization system of claim 1, wherein: the control module comprises an ADC sampling module and a DSP processing module.
4. The traction substation battery pack voltage equalization system of claim 1, wherein: the switching device Q1、Q2Is a thyristor switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122724989.9U CN216121890U (en) | 2021-11-09 | 2021-11-09 | Voltage balancing system for storage battery pack of traction substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122724989.9U CN216121890U (en) | 2021-11-09 | 2021-11-09 | Voltage balancing system for storage battery pack of traction substation |
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| Publication Number | Publication Date |
|---|---|
| CN216121890U true CN216121890U (en) | 2022-03-22 |
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| CN202122724989.9U Expired - Fee Related CN216121890U (en) | 2021-11-09 | 2021-11-09 | Voltage balancing system for storage battery pack of traction substation |
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2021
- 2021-11-09 CN CN202122724989.9U patent/CN216121890U/en not_active Expired - Fee Related
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Granted publication date: 20220322 |