CN107370201B - Direct-current power supply system based on storage battery series-parallel combination - Google Patents
Direct-current power supply system based on storage battery series-parallel combination Download PDFInfo
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- CN107370201B CN107370201B CN201710537421.1A CN201710537421A CN107370201B CN 107370201 B CN107370201 B CN 107370201B CN 201710537421 A CN201710537421 A CN 201710537421A CN 107370201 B CN107370201 B CN 107370201B
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- 238000012806 monitoring device Methods 0.000 claims abstract description 33
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 238000012544 monitoring process Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 230000001012 protector Effects 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a direct-current power supply system based on serial-parallel combination of storage batteries, which comprises an alternating-current power distribution device, a monitoring device, a power converter, an anti-reverse device and a single storage battery, wherein the alternating-current power distribution device is connected with the monitoring device through a power converter; the single storage battery comprises a series connection type single storage battery and an equivalent parallel connection type single storage battery; the single storage batteries are combined in series and parallel, and the series-connected single storage batteries are physically connected in series and used for providing a great impact current when a large load is put into or a branch circuit is short-circuited; the series single storage batteries are indirectly connected in parallel through the power converters, so that the requirement on the consistency of the storage batteries is reduced, and the charging and discharging of the single storage battery can be realized. The invention has the beneficial effects that: the power supply reliability is high; the voltage drop is prevented by the series-connected single storage batteries; the storage battery in the system is easy to realize equalizing charge; the monitoring device can realize the interaction between the direct current bus and the charging strategy, and the output current of the power converter has high current-sharing degree.
Description
Technical Field
The invention relates to the field of power supply and storage battery application, in particular to a direct current power supply system based on storage battery series-parallel combination, which has high power supply reliability, can save discharge load cost, realizes effective use of energy, has low requirement on consistency among single storage batteries, is easy to realize balanced charging of storage batteries in the system and has low overall cost.
Background
The traditional integrated electric direct-current power supply system overcomes the defects of disordered configuration, decentralized management, poor compatibility and the like of the traditional secondary power supply. However, the storage battery pack is uniformly charged by the alternating current-direct current converter (AC/DC module), so that the requirements on consistency of performance parameters such as the model number, the capacity, the service life and the like of the storage battery are very high, the storage battery is difficult to realize balanced charging, and meanwhile, the reliability of the alternating current-direct current converter and the storage battery is not high relatively because the direct current bus has only two power supply modes.
Compared with the traditional integrated power supply system, the series working mode of the storage battery pack is changed, and the storage battery pack is indirectly connected in parallel through the switching power supply module, so that the intelligent power supply system has the advantages of high reliability, convenience in maintenance, resource saving, environmental friendliness, high intelligent degree and the like. However, since the storage battery is not connected to the dc bus, there are several problems as follows: (1) when the load jumps dynamically, the voltage at the direct current bus fluctuates greatly; (2) when the branch circuit is in short circuit, the voltage of the direct current bus is supported due to insufficient energy, and the whole direct current system is powered off.
Chinese patent publication No. CN102214945A, No. 10/12/2011, discloses a dc power supply system based on parallel connection of storage batteries, which includes an ac power distribution unit, the ac power distribution unit is connected to a plurality of converters, and each converter is connected to a storage battery; the plurality of converters are connected to the direct current distribution unit through a system direct current bus, and the output end of the direct current distribution unit is connected with a load; the monitoring unit is used for detecting the running condition of the alternating current power distribution unit, controlling the converter according to the running condition and reporting the running condition to the upper computer; the converter converts alternating current output by the alternating current distribution unit into high-voltage direct current, and when the alternating current distribution unit normally operates, the converter charges the storage battery and supplies power to a load through the direct current distribution unit, or when the alternating current distribution unit is abnormal, the converter supplies power to the load by using energy stored in the storage battery. The invention utilizes the high-frequency converter technology to convert the single low-voltage storage battery into the required direct-current voltage for output, and all the storage batteries in the system are mutually isolated, thereby realizing the unlimited parallel connection of the storage batteries and expanding the system capacity. But has the following disadvantages: the system has low reliability, cannot provide instantaneous impact current, and cannot prevent the voltage drop of the direct-current bus when the branch circuit is short-circuited.
Disclosure of Invention
In order to overcome the defects that the power supply reliability is low, the requirement on the consistency of storage batteries is high, instantaneous impact current cannot be provided, and the voltage drop of a direct current bus cannot be prevented when a branch circuit is short-circuited in the prior art, the invention provides the direct current power supply system which has high power supply reliability, can save the discharge load cost, realizes effective use of energy, has low requirement on the consistency of single storage batteries, is easy to realize the balanced charging of the storage batteries in the system and has low overall cost based on the serial-parallel combination of the storage batteries.
In order to achieve the purpose, the invention adopts the following technical scheme:
a direct current power supply system based on storage battery series-parallel combination comprises an alternating current distribution device, a monitoring device, a power converter, an anti-reverse device and a single storage battery; the single storage battery comprises a series connection type single storage battery and an equivalent parallel connection type single storage battery; the alternating current distribution device is electrically connected with the monitoring device and the power converter respectively; the power converter is respectively and electrically connected with the series-connected single storage battery, the equivalent parallel-connected single storage battery and the monitoring device; one end of the anti-reverse device is connected with the positive end of the series-connected single storage battery, and the other end of the anti-reverse device is connected with the positive end of the direct current bus;
the single storage batteries are combined in series and parallel, and the series-connected single storage batteries are physically connected in series and used for providing a great impact current when a large load is put into or a branch circuit is short-circuited; the series single storage batteries are indirectly connected in parallel through the power converters, so that the requirement on the consistency of the storage batteries is reduced, and the charging and discharging of the single storage battery can be realized.
The monitoring device is used for monitoring the working condition of components of the alternating-current power distribution device, the working condition of the power converter and the voltage condition of the direct-current bus;
the power converter is used for simultaneously realizing the conversion of the alternating-current bus voltage to the direct-current bus voltage, the alternating-current bus voltage to the single storage battery voltage and the single storage battery voltage to the direct-current bus voltage.
The direct-current power supply system is based on the serial-parallel combination of storage batteries, and realizes the voltage conversion through a power converter; the monitoring device is used for monitoring the working condition of components of the alternating current power distribution device, the working condition of the power converter and the voltage condition of the direct current bus.
Preferably, the power converter comprises an EMI filter, an AC/DC conversion module, a battery charging/discharging module capable of bidirectionally transmitting energy and an anti-reverse diode; one end of the AC-DC conversion module is electrically connected with one end of the EMI filter, and the other end of the AC-DC conversion module is respectively electrically connected with one end of the battery charge-discharge module and one end of the anti-reverse diode; the other end of the EMI filter is electrically connected with an alternating current input, one end of the battery charge-discharge module is electrically connected with one end of the anti-reverse diode, and the other end of the battery charge-discharge module is electrically connected with the single storage battery; the other end of the anti-reverse diode is electrically connected with the direct current bus;
the EMI filter is used for solving the problem of electromagnetic compatibility of the power converter;
the battery charging and discharging module is used for realizing the charging and discharging of the single storage battery;
and the anti-reverse diode is used for preventing the current of the direct current bus from reversely flowing to the battery and the alternating current-direct current conversion module, and realizing the reliable parallel connection of the plurality of power converters.
Preferably, the monitoring device comprises an alternating current monitoring unit for sampling and monitoring an alternating current bus and multiple alternating current input sources; the alternating current monitoring unit is electrically connected with the alternating current distribution device.
Preferably, the monitoring device further comprises a power conversion module management unit, which is used for realizing control over a nuclear capacity instruction, start-stop operation, a charge-discharge strategy, temperature compensation and online battery maintenance or replacement of the power converter, and simultaneously setting output voltage, current stabilization current and power limit of each power converter; the converter module management unit is electrically connected with each power converter.
Preferably, the monitoring device further comprises a communication subunit, which is used for communicating with the background main monitoring, receiving and executing the instruction sent by the background main monitoring, and uploading the operating parameters, the warning information and the history of the dc power supply system to the background main monitoring.
Preferably, the monitoring device further comprises a direct current bus detection unit, which is used for monitoring signals of the output direct current bus insulation grade and the alternating current serial input quantity and detecting the voltage and the current of the direct current bus; the direct current bus detection unit is electrically connected with the direct current bus.
Preferably, the monitoring device further comprises a display and setting unit for displaying the operation parameters and providing a setting interface of a field operation mode and an acousto-optic alarm.
Preferably, the components of the ac power distribution apparatus include a circuit breaker, a leakage protector, and a lightning arrester, which are all electrically connected to the monitoring apparatus.
Therefore, the invention has the following beneficial effects: (1) the invention improves the reliability of power supply from a plurality of links such as alternating current input power distribution, a power converter, series-parallel combination of a storage battery, system configuration and the like; (2) the voltage drop of the direct current bus under the conditions of high-capacity load input, branch short circuit and the like is prevented by the series battery pack; (3) the intelligent control of the single storage battery realizes the regular or irregular on-line capacity checking of the storage battery, the automatic on-line capacity checking and activation reduce the labor cost, and meanwhile, the electric quantity in the battery is directly provided for a direct current bus load, so that the discharging load cost is saved, and the effective use of energy is realized; (4) the power converter indirectly connects a plurality of storage batteries in parallel, and has lower requirements on consistency of capacity, model, service life and other performances among the single storage batteries; (5) the charging strategy and the discharging state of the single storage battery are formulated by the corresponding power converters, so that the storage battery in the system is easy to realize balanced charging; (6) the monitoring device can realize the interaction between the direct current bus and the charging strategy, and the output current of the power converter has high current-sharing degree; (7) the invention reduces expenditure in each link of system construction, system management and the like, and reduces the total cost.
Drawings
FIG. 1 is a system block diagram of the present invention;
fig. 2 is an operational view of the serial-type unit batteries of the present invention;
FIG. 3 is an internal block diagram of the power converter of the present invention;
fig. 4 is an internal structural view of the monitoring device of the present invention.
In the figure: the system comprises an alternating current distribution device 1, a monitoring device 2, a power converter 3, an anti-reverse device 4, a single storage battery 5, a background main monitoring 6, an alternating current monitoring unit 21, a power conversion module management unit 22, a communication subunit 23, a direct current bus detection unit 24, a display and setting unit 25, an EMI filter 31, an alternating current-direct current conversion module 32, a battery charging and discharging module 33, an anti-reverse diode 34, a serial single storage battery 51 and an equivalent parallel single storage battery 52.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The embodiment shown in fig. 1 is a dc power supply system based on series-parallel combination of storage batteries, and includes an ac power distribution device 1, a monitoring device 2, a power converter 3, an anti-reverse device 4 and a single storage battery 5; the alternating current distribution device performs optimal selection and automatic rapid switching on the multi-path alternating current input to form an alternating current bus which supplies power more reliably, and realizes data exchange with the monitoring device so as to realize the display of the alternating current input operation parameters and the query and uploading of the power supply state. The monitoring device and the alternating current power distribution device realize data exchange; the monitoring device and the power converters realize data exchange so as to realize setting and inquiring of the operation parameters of each power converter, for example, setting of a charging strategy of a storage battery, a core capacity mode, voltage setting of a direct current bus and the like. As shown in fig. 2, the power converter obtains energy from the ac bus, and after passing through the internal EMI filter 31, the ac-dc conversion module 32, and the anti-reverse diode 34, the power converter is connected to the dc bus to supply power to the dc bus; the power converter acquires energy from the alternating current bus, and the energy is connected with the single storage battery after passing through the internal EMI filter, the alternating current-direct current conversion module and the battery charging and discharging module 33 to charge the single storage battery; the power converter obtains energy from the single storage battery, and provides energy for the direct current bus after passing through the internal battery charging and discharging module and the anti-reverse diode. The single storage battery is divided into two application forms in the direct current power supply system, namely a series connection type single storage battery 51 and an equivalent parallel connection type single storage battery 52. One end of the series single storage battery is connected with the power converter, the series single storage battery can be charged by the power converter and can also be discharged to the direct current bus by the power converter, and meanwhile, after the series single storage batteries are sequentially connected in series, the positive end of the series single storage battery is connected with the anti-reverse device, and the negative end of the series single storage battery is connected with the negative electrode of the direct current bus, so that the series single storage battery can inhibit the voltage of the direct current bus from being too low under the conditions of alternating current power loss, power converter damage, large-capacity load input, branch circuit short circuit and the like, and can provide great impact current without additionally arranging a voltage drop inhibiting device at the direct current bus or improving the instantaneous load carrying. One end of the equivalent parallel single storage battery is connected with the power converter, and the equivalent parallel single storage battery can be charged by the power converter and can also be discharged to the direct current bus by the power converter. The anti-reverse device is connected with the positive end of the series-connected single storage battery at one end and the positive end of the direct current bus at the other end, and is used for preventing current from reversely flowing into the single storage battery from the direct current bus, otherwise, a circular current can be formed.
As shown in fig. 2, the series-connected single batteries are equivalently connected in parallel through the power converters, and are physically connected in series, which is the best usage. Even under the condition that the line 1 or the line 2 is singly broken, the unit batteries BATb1 and BATb2 … BATbn can supply power to the direct current bus.
As shown in fig. 3, the power converter includes an EMI filter, an ac/dc conversion module, a battery charging/discharging module capable of bidirectional energy transfer, and an anti-reverse diode; the input end of the EMI filter is connected with an alternating current input, and the output end of the EMI filter is connected with an alternating current-direct current conversion module, so that the problem of electromagnetic compatibility of the power converter is solved. The input end of the alternating current-direct current conversion module is connected with the EMI filter, the output end of the alternating current-direct current conversion module is simultaneously connected with the battery charging and discharging module and the anti-reverse diode, the single storage battery is charged through the battery charging and discharging module, and meanwhile, the power is supplied to the direct current bus through the anti-reverse diode. One end of the battery charge-discharge module is connected with the alternating current-direct current conversion module and the anti-reverse diode, and the other end of the battery charge-discharge module is connected with the single storage battery, so that the charge and discharge of the single storage battery are realized. One end of the anti-reverse diode is connected with the output of the AC-DC converter and the battery charging and discharging module, and the other end of the anti-reverse diode is connected with the DC bus, so that the current of the DC bus is prevented from reversely flowing to the battery and the AC-DC conversion module, and the reliable parallel connection of a plurality of power converters is realized.
As shown in fig. 4, the monitoring apparatus includes an ac monitoring unit 21, a power conversion module management unit 22, a communication subunit 23, a dc bus detection unit 24, and a display and setting unit 25; the alternating current monitoring unit samples and monitors an alternating current bus and multiple alternating current input sources. The power conversion module management unit is communicated with the power conversion module to realize control over the power conversion module, including a core capacity instruction, start-stop operation, a charge-discharge strategy, temperature compensation, online battery maintenance or replacement and the like, and output voltage, current stabilization current, power limitation and the like of each power conversion unit can be set. The direct current bus detection unit monitors signals such as output direct current bus insulation grade and alternating current serial input quantity, and detects physical quantities such as voltage and current of the direct current bus. The communication subunit is communicated with the background main monitor 6, receives and executes the instruction sent by the background monitor, and uploads the operation parameters, protection and alarm information, historical records and the like of the direct current power supply system to the main monitor. The display and setting unit displays the operation parameters, provides sound and light alarm and simultaneously provides a setting interface of a field operation mode.
It should be understood that this example is for illustrative purposes only and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (7)
1. A direct-current power supply system based on storage battery series-parallel combination is characterized by comprising an alternating-current power distribution device (1), a monitoring device (2), a power converter (3), an anti-reverse device (4) and a single storage battery (5); the single storage batteries comprise a series connection type single storage battery (51) and an equivalent parallel connection type single storage battery (52); the power converter comprises an EMI filter (31), an alternating current-direct current conversion module (32), a battery charging and discharging module (33) capable of bidirectionally transmitting energy and an anti-reverse diode (34); one end of the AC-DC conversion module is electrically connected with one end of the EMI filter, and the other end of the AC-DC conversion module is respectively electrically connected with one end of the battery charge-discharge module and one end of the anti-reverse diode; the other end of the EMI filter is electrically connected with an alternating current input, one end of the battery charge-discharge module is electrically connected with one end of the anti-reverse diode, and the other end of the battery charge-discharge module is electrically connected with the single storage battery; the other end of the anti-reverse diode is electrically connected with the direct current bus; the alternating current distribution device is electrically connected with the monitoring device and the power converter respectively; the power converter is respectively and electrically connected with the series-connected single storage battery, the equivalent parallel-connected single storage battery and the monitoring device; one end of the anti-reverse device is connected with the positive end of the series-connected single storage battery, and the other end of the anti-reverse device is connected with the positive end of the direct current bus;
the single storage batteries are combined in series and parallel, and the series-connected single storage batteries are physically connected in series and used for providing a great impact current when a large load is put into or a branch circuit is short-circuited; the series-connected single storage batteries are indirectly connected in parallel through the power converters, so that the requirement on the consistency of the storage batteries is reduced, and the charging and discharging of the single storage battery can be realized;
the monitoring device is used for monitoring the working condition of components of the alternating-current power distribution device, the working condition of the power converter and the voltage condition of the direct-current bus;
the power converter is used for simultaneously realizing the conversion of the alternating-current bus voltage to the direct-current bus voltage, the alternating-current bus voltage to the single storage battery voltage and the single storage battery voltage to the direct-current bus voltage;
the EMI filter is used for solving the problem of electromagnetic compatibility of the power converter;
the battery charging and discharging module is used for realizing the charging and discharging of the single storage battery;
and the anti-reverse diode is used for preventing the current of the direct current bus from reversely flowing to the battery and the alternating current-direct current conversion module, and realizing the reliable parallel connection of the plurality of power converters.
2. The direct-current power supply system based on the series-parallel combination of the storage batteries is characterized in that the monitoring device comprises an alternating-current monitoring unit (21) for sampling and monitoring an alternating-current bus and multiple alternating-current input sources; the alternating current monitoring unit is electrically connected with the alternating current distribution device.
3. The direct-current power supply system based on the series-parallel combination of the storage batteries according to claim 2, wherein the monitoring device further comprises a power conversion module management unit (22) for realizing control over the nuclear capacity instruction, start-stop operation, charge-discharge strategy, temperature compensation, online battery maintenance or replacement of the power converters, and simultaneously setting the output voltage, the steady current and the power limit of each power converter; the converter module management unit is electrically connected with each power converter.
4. The direct-current power supply system based on the series-parallel combination of the storage batteries is characterized in that the monitoring device further comprises a communication subunit (23) which is used for communicating with the background main monitoring device (6), receiving and executing instructions sent by the background main monitoring device, and uploading the operating parameters, warning information and historical records of the direct-current power supply system to the background main monitoring device.
5. The direct-current power supply system based on the series-parallel combination of the storage batteries according to claim 2, wherein the monitoring device further comprises a direct-current bus detection unit (24) for monitoring signals of the insulation grade of the output direct-current bus and the alternating-current serial input quantity and simultaneously detecting the voltage and the current of the direct-current bus; the direct current bus detection unit is electrically connected with the direct current bus.
6. The direct-current power supply system based on the series-parallel combination of the storage batteries is characterized in that the monitoring device further comprises a display and setting unit (25) for displaying the operation parameters and providing a setting interface of a field operation mode and an acousto-optic alarm.
7. The direct-current power supply system based on the series-parallel combination of the storage batteries according to claim 1, 2, 3, 4, 5 or 6, wherein the components of the alternating-current power distribution device comprise a circuit breaker, a leakage protector and a lightning protector, and the circuit breaker, the leakage protector and the lightning protector are all electrically connected with a monitoring device.
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| CN220570346U (en) * | 2023-08-21 | 2024-03-08 | 安徽明德源能科技有限责任公司 | Power storage device, energy storage unit and power supply system with multiple storage battery modules connected in series |
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