CN213402553U - Power system modularization direct current uninterrupted power source based on low pressure storage battery - Google Patents

Power system modularization direct current uninterrupted power source based on low pressure storage battery Download PDF

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Publication number
CN213402553U
CN213402553U CN202021979164.0U CN202021979164U CN213402553U CN 213402553 U CN213402553 U CN 213402553U CN 202021979164 U CN202021979164 U CN 202021979164U CN 213402553 U CN213402553 U CN 213402553U
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China
Prior art keywords
converter
storage battery
low
power
voltage
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Expired - Fee Related
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CN202021979164.0U
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Chinese (zh)
Inventor
丰瀚麟
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Nanjing Megampere Electrical Science & Technology Co ltd
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Nanjing Megampere Electrical Science & Technology Co ltd
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
    • Y—GENERAL 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/248—UPS systems or standby or emergency generators

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  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model discloses a power system modularization direct current uninterrupted power source based on low voltage storage battery, which adopts a modularized structure and at least comprises a module, wherein each module comprises an AC/DC converter, a low voltage storage battery and a DC/DC converter; the input end of the AC/DC converter is electrically connected with a power frequency power grid, the output end of the AC/DC converter is electrically connected with the input end of the DC/DC converter, the output end of the DC/DC converter is electrically connected with a direct current bus for supplying power to secondary equipment, and the low-voltage storage battery pack is electrically connected with the input end of the AC/DC converter and the output end of the DC/DC converter respectively. The utility model provides a battery output range wide, storage battery because the difficult scheduling problem of maintenance that the series connection leads to.

Description

Power system modularization direct current uninterrupted power source based on low pressure storage battery
Technical Field
The utility model belongs to the electric power system field, in particular to electric power system modularization direct current uninterrupted power source.
Background
The important secondary equipment of the existing power system is supplied with 220V or other voltage levels of direct current. Conventionally, a plurality of groups of storage batteries are connected in series to serve as an uninterruptible power supply and are connected to a direct-current power supply bus in parallel.
The direct current uninterrupted power supply adopting the batteries connected in series is reliable and mature in work, but has the following main problems: the bus voltage change range is wide, and a voltage reduction device is usually adopted to limit a power supply source within a working range allowed by secondary equipment when a storage battery is fully charged, so that the system is complex, the energy consumption is increased, and the reliability of the system is reduced; the voltage grade required by the secondary equipment to work is obtained by connecting a large number of storage battery monomers in series, the backup power supply time and the power supply reliability of a system are influenced by the backward batteries due to the discreteness of the battery performance, the monitoring and maintenance requirements of the storage batteries are increased, the equipment such as complex battery monitoring and capacity checking is generally required, and the whole group of storage batteries is generally required to be replaced when the backward batteries appear, so that the use cost is high.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that above-mentioned background art mentioned, the utility model provides an electric power system modularization direct current uninterrupted power source based on low pressure storage battery has solved the maintenance difficulty scheduling problem that battery output range is wide, storage battery leads to owing to establishing ties.
In order to realize the technical purpose, the utility model discloses a technical scheme does:
a modular direct-current uninterruptible power supply of a power system based on a low-voltage storage battery pack adopts a modular structure and at least comprises one module, wherein each module comprises an AC/DC converter, the low-voltage storage battery pack and a DC/DC converter; the input end of the AC/DC converter is electrically connected with a power frequency power grid, the output end of the AC/DC converter is electrically connected with the input end of the DC/DC converter, the output end of the DC/DC converter is electrically connected with a direct current bus for supplying power to secondary equipment, and the low-voltage storage battery pack is electrically connected with the input end of the AC/DC converter and the output end of the DC/DC converter respectively.
Based on the preferable scheme of the technical scheme, the number of the modules is determined according to the capacity requirement of the system, when n modules exist, the n modules are connected in parallel, and n is larger than or equal to 1.
Based on the preferred scheme of the technical scheme, the power frequency power grid is a three-phase four-wire system, and each module is connected to any one of the power frequency power grids.
Based on the preferable scheme of the technical scheme, the AC/DC converter is provided with an active power factor corrector.
Based on the preferable scheme of the technical scheme, the low-voltage storage battery adopts a storage battery with the voltage grade of 12V or 24V.
Based on the preferable scheme of the technical scheme, the DC/DC converter is a boost converter.
Based on the preferable scheme of the technical scheme, the AC/DC converter is provided with a current sampling and control circuit, and the current sampling and control circuit is electrically connected with the low-voltage storage battery pack.
Based on the preferable scheme of the technical scheme, the controllers of the AC/DC converter and the DC/DC converter are in data connection with an external monitoring end through a CAN bus.
Adopt the beneficial effect that above-mentioned technical scheme brought:
compare in traditional battery series connection DC power supply system, the utility model discloses based on low pressure storage battery and combine modularization power conversion device, have following outstanding advantage:
1. the system is flexible to construct, and the capacity can be reasonably configured as required;
2. the power converter and the power supply converter are of modular structures and have fault protection and isolation functions, and the working reliability of the combined system is high;
3. the power converter and the power supply converter are both isolated converters, and a low-voltage storage battery is arranged in the middle of the power converter and the power supply converter, so that the system safety is high;
4. the system has good power supply voltage stability, high precision, high input power factor and small influence on an alternating current power supply;
5. the capacity of the battery can be checked on line, the laggard battery can be replaced according to the online condition, the maintenance is simple and convenient, and the use cost is low.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
The utility model discloses an electric power system modularization direct current uninterrupted power source based on low pressure storage battery, as shown in FIG. 1, adopt modular structure, include a module at least (including n modules in the picture), every module includes AC/DC converter (as power converter), low pressure storage battery and DC/DC converter (as power converter). The input end of the AC/DC converter is electrically connected with a power frequency power grid, the output end of the AC/DC converter is electrically connected with the input end of the DC/DC converter, the output end of the DC/DC converter is electrically connected with a direct current bus for supplying power to secondary equipment, and the low-voltage storage battery pack is electrically connected with the input end of the AC/DC converter and the output end of the DC/DC converter respectively.
Each module contains 3 parts: 1. a power converter (AC/DC converter) for supplying power online and charging the storage battery; 2. a low-voltage battery pack as a backup energy source; 3. and the power supply converter (DC/DC converter) is used for supplying power to the low voltage and is connected in parallel with the 220V direct current power supply bus. When a mains supply power grid is normal, performing two-stage conversion through an AC/DC converter and a DC/DC converter and then supplying power to a direct current bus on line; when the power grid loses power, the storage battery is used as an energy source, and uninterrupted power supply of the bus is realized through the DC/DC converter.
All modules are connected in parallel, the number of the modules is determined according to the capacity requirement of the system, the modules are mutually independent, the power frequency power grid adopts a three-phase four-wire system, and each module is connected to any one of the power frequency power grids.
In this embodiment, preferably, the AC/DC converter is provided with an active Power Factor Corrector (PFC), so as to improve the power factor of the input current and reduce harmonic interference to the power grid. The output is low-voltage direct current, constant-voltage current limiting is adopted in control, the highest voltage is constant at the floating charging voltage of the storage battery pack, and meanwhile, the charging current of the storage battery is limited.
In the present embodiment, the low-voltage battery pack preferably employs a conventional 12V or 24V voltage class lead-acid battery.
In this embodiment, the DC/DC converter is preferably a boost converter capable of converting the output of the AC/DC converter or the voltage of the battery pack into a 220V DC bus voltage. The direct current bus-bar parallel connection circuit has a current limiting function, and can limit module power and realize direct parallel connection with a direct current bus.
In this embodiment, preferably, the AC/DC converter is provided with a current sampling and control circuit, which is electrically connected to the low-voltage battery pack, and can check the battery capacity online through the charging and discharging process of the battery.
In this embodiment, it is preferable that the AC/DC converter and the controller of the DC/DC converter of each module communicate with a CAN bus, and CAN receive commands and transmit status and parameters with external remote man-machine and monitor. The output of the converter CAN be set through a CAN bus, and a single group of storage battery packs CAN be charged or discharged through appropriate parameter and working state control, so that the checking or state judgment of the capacity of the storage battery packs CAN be realized, and the regular or irregular detection requirements of a power supply battery by a power system are met under the condition of not adopting additional equipment.
The embodiment is only for explaining the technical thought of the utility model, can not limit with this the utility model discloses a protection scope, all according to the utility model provides a technical thought, any change of doing on technical scheme basis all falls into the utility model discloses within the protection scope.

Claims (6)

1. The utility model provides a power system modularization direct current uninterrupted power source based on low pressure storage battery, its characterized in that: the modular structure is adopted, and at least one module is included, and each module comprises an AC/DC converter, a low-voltage storage battery pack and a DC/DC converter; the input end of the AC/DC converter is electrically connected with a power frequency power grid, the output end of the AC/DC converter is electrically connected with the input end of the DC/DC converter, the output end of the DC/DC converter is electrically connected with a direct current bus for supplying power to secondary equipment, and the low-voltage storage battery pack is respectively electrically connected with the input end of the AC/DC converter and the output end of the DC/DC converter; the AC/DC converter is provided with an active power factor corrector; the AC/DC converter is provided with a current sampling and control circuit, and the current sampling and control circuit is electrically connected with the low-voltage storage battery pack.
2. The low-voltage battery pack-based power system modular direct-current uninterruptible power supply of claim 1, wherein: the number of the modules is determined according to the capacity requirement of the system, when n modules exist, the n modules are connected in parallel, and n is larger than or equal to 1.
3. The low-voltage battery pack-based power system modular direct-current uninterruptible power supply of claim 1, wherein: the power frequency power grid is a three-phase four-wire system, and each module is connected to any one of the power frequency power grids.
4. The low-voltage battery pack-based power system modular direct-current uninterruptible power supply of claim 1, wherein: the low-voltage storage battery adopts a storage battery with a voltage grade of 12V or 24V.
5. The low-voltage battery pack-based power system modular direct-current uninterruptible power supply of claim 1, wherein: the DC/DC converter is a boost converter.
6. The low-voltage battery pack-based power system modular direct-current uninterruptible power supply of claim 1, wherein: and the controllers of the AC/DC converter and the DC/DC converter are in data connection with an external monitoring end through a CAN bus.
CN202021979164.0U 2020-09-11 2020-09-11 Power system modularization direct current uninterrupted power source based on low pressure storage battery Expired - Fee Related CN213402553U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021979164.0U CN213402553U (en) 2020-09-11 2020-09-11 Power system modularization direct current uninterrupted power source based on low pressure storage battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021979164.0U CN213402553U (en) 2020-09-11 2020-09-11 Power system modularization direct current uninterrupted power source based on low pressure storage battery

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CN213402553U true CN213402553U (en) 2021-06-08

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