CN113794195A - Array type DC power supply system and management method - Google Patents
Array type DC power supply system and management method Download PDFInfo
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- CN113794195A CN113794195A CN202111090781.4A CN202111090781A CN113794195A CN 113794195 A CN113794195 A CN 113794195A CN 202111090781 A CN202111090781 A CN 202111090781A CN 113794195 A CN113794195 A CN 113794195A
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- 238000007726 management method Methods 0.000 title claims abstract description 104
- 238000007600 charging Methods 0.000 claims description 46
- 238000007599 discharging Methods 0.000 claims description 24
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- 230000011664 signaling Effects 0.000 claims description 7
- 239000013543 active substance Substances 0.000 claims description 3
- 238000010277 constant-current charging Methods 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 2
- 238000010998 test method Methods 0.000 claims 1
- 238000012795 verification Methods 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
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- 230000002035 prolonged effect Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 2
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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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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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
- H02J5/00—Circuit arrangements for transfer of electric power between AC networks and DC networks
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
- H02J7/04—Regulation of charging current or voltage
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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)
- Computer Networks & Wireless Communication (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明公开了一种阵列式直流电源系统及管理方法，包括：一体式并联直流电源单元，所述一体式并联直流电源单元具有电源输入端、直流输出端和电池，所述电池与所述电源输入端和所述直流输出端隔离，多个所述一体式并联直流电源单元并联形成系统，各个所述一体式并联直流电源单元的电池之间相互隔离；边缘管理终端模块，所述边缘管理终端模块与所述一体式并联直流电源单元电联接。通过边缘管理终端，利用分布式思维技术，从系统架构及阵列式创新管理方式，提升直流电源系统供电可靠性，实现直流电源系统的免维护设计；有效延长蓄电池使用寿命，每只蓄电池都可以使用至寿命终止点，提高蓄电池利用率；系统通过边缘管理终端实现阵列式管理模块的工作方式，同时实现削峰填谷使用能源，助力碳减排。
The invention discloses an array type DC power supply system and a management method, comprising: an integrated parallel DC power supply unit, the integrated parallel DC power supply unit has a power input terminal, a DC output terminal and a battery, the battery and the power supply The input terminal is isolated from the DC output terminal, a plurality of the integrated parallel DC power supply units are connected in parallel to form a system, and the batteries of each integrated parallel DC power supply unit are isolated from each other; the edge management terminal module, the edge management terminal The module is electrically connected to the integrated parallel DC power supply unit. Through the edge management terminal, the distributed thinking technology is used, the system architecture and the array-type innovative management method are used to improve the reliability of the DC power supply system, and the maintenance-free design of the DC power supply system is realized; the service life of the battery is effectively extended, and each battery can be used To the end of life, the utilization rate of the battery is improved; the system realizes the working mode of the array management module through the edge management terminal, and at the same time realizes the use of energy by shaving peaks and filling valleys to help reduce carbon emissions.
Description
Technical Field
The invention relates to the technical field of direct-current power supply systems, in particular to an array type direct-current power supply system and a management method.
Background
At present, a common direct-current power supply system is provided with a plurality of rectifier modules, a group of storage battery packs and a battery inspection unit, wherein the input end of each rectifier module is an alternating-current power supply (AC220) or a direct-current power supply (DC 110-400V), and the output end of each rectifier module is direct current and is connected with the storage battery packs in parallel to form a direct-current power supply system with rated voltage of 240/220/110/48V. A plurality of sections of 2V lead-acid storage batteries of the storage battery pack are connected in series to form the system, when the system normally operates, the rectifier module charges the storage battery pack and supplies power to a load at the same time, and the storage battery pack charges or discharges simultaneously when working.
The system is insufficient: 1. when the power supply at the input end of the system is in a normal state, the storage battery pack is in a floating charging state, and the health condition of a single storage battery is difficult to diagnose by the prior art means. 2. If the single storage battery is abnormal in open circuit, the storage battery can reach a charging set voltage value in a short time during charging, the storage battery can not reach a full capacity state, and if a power supply at the input end of the system is powered off at the moment, the voltage of the direct current main output port is sharply reduced to 0, so that the system loses power. 2. If some batteries are abnormal, the internal impedance of the batteries is changed towards a smaller trend than normal, the impedance change is a gradual change process, and the system cannot realize early detection, so that some batteries in the battery pack are overcharged, and the damage of other batteries is accelerated. 3. Because each single storage battery in the system is connected in series to form a direct current bus, the output voltage of the direct current bus is high, a single abnormal storage battery cannot be replaced on line, the storage battery can be replaced correspondingly after the storage battery is withdrawn after the standby battery with corresponding number of sections is accessed, and the operation of the whole replacement process is complicated. 5. After part battery of system is unusual, usually whole group changes, eliminates the good battery of inside together when whole group changes, causes the battery utilization ratio not high, causes the wasting of resources, causes whole group life-span simultaneously and can't reach the design expectation, can't all use the life-span termination point to every section battery. A schematic diagram of a conventional operating power supply system is shown in fig. 3.
Disclosure of Invention
The invention mainly aims to provide an array type direct current power supply system which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
an array type direct current power supply system comprising:
the integrated parallel direct-current power supply unit is provided with a power supply input end, a direct-current output end and a battery, the battery is isolated from the power supply input end and the direct-current output end, a plurality of integrated parallel direct-current power supply units are connected in parallel to form a system, and the batteries of the integrated parallel direct-current power supply units are isolated from each other;
and the edge management terminal module is electrically connected with the integrated parallel direct-current power supply unit.
Furthermore, the edge management terminal module is in signal connection with the plurality of integrated parallel direct-current power supply units through CAN communication, and records data information of each unit for module remote control, remote regulation, remote measurement and remote signaling operation.
Furthermore, the input end of the battery is connected with the output end of the voltage reduction DC/DC module, the input end of the voltage reduction DC/DC module is connected with the output end of the AC/DC module, and the input end of the AC/DC module is connected with the power supply input end.
Further, the output end of the battery is electrically connected with the input end of the voltage open-loop boosting DC/DC module, the output end of the voltage open-loop boosting DC/DC module is electrically connected with the input end of the output step-down DC/DC module and the input end of the output DC/DC module, and the output step-down DC/DC module and the output end of the output DC/DC module are connected with the output bus.
The intelligent management unit is connected with the current equalizing unit, the output DC/DC module, the voltage reduction DC/DC module, the voltage open loop voltage boost DC/DC module and the output voltage reduction DC/DC module.
Further, the current equalizing unit is connected with the output voltage reduction DC/DC module and the output DC/DC module.
Further, the direct current feeder distribution unit is electrically connected with the integrated parallel direct current power supply unit.
The array direct-current power supply management method based on the array direct-current power supply system comprises the following steps:
the battery is isolated from the output end of the direct current bus and the input end of the power supply, and the battery is isolated from each battery in the system;
charging the built-in battery and outputting the charged battery to the DC bus;
when the front-end direct-current bus is normal, the output voltage value of the output step-down DC/DC converter is lower than that of the output DC/DC converter and is in a standby state;
when the front-end direct-current bus is abnormal or the output voltage of the output DC/DC converter drops to be the same as that of the output step-down DC/DC converter, the output step-down DC/DC is immediately carried, the output of the module is ensured to be uninterrupted, and the power supply reliability of the system is ensured;
when the outlet of the feeder switch of the system is short-circuited and large current is required to be output by the module for a short time to drive the feeder switch to trip, the intelligent management unit enables the output DC/DC module and the output voltage reduction DC/DC module to share the large current output through the control of the current equalizing unit.
Further, the method also comprises the following steps:
the edge management terminal is provided with a set multi/single module capacity checking period, when the set period is reached, whether a direct current bus is normal or not is detected, whether the current of a system bus meets the lowest capacity checking load or not is detected, whether all batteries are in an intermittent charging state or not is detected, and the integrated parallel direct current unit has no other faults, alarm information and the like, an instruction is issued to the intelligent management units of the integrated parallel direct current units, if the current of the system bus meets the requirement, the multi-module simultaneously starts corresponding capacity checking logic, the AC/DC module is closed firstly, the current equalizing unit is quitted from the system current equalizing by controlling the current equalizing unit, the voltage reducing DC/DC module is closed simultaneously, the voltage reducing DC/DC module is output simultaneously to start adjusting output voltage, the integrated parallel direct current unit to be checked is enabled to provide energy bearing by the batteries, the output voltage is adjusted until the discharge current of the battery end is maintained to the preset value, the intelligent management unit immediately uploads the capacity checking data to the edge management terminal in the whole capacity checking process until the battery stops a discharge voltage point or maintains for 10 hours to finish the capacity checking operation;
the edge management terminal is provided with a set single module capacity checking period, when the set period is reached, whether the direct current bus is normal at the moment is detected, whether the current of the system bus meets the lowest capacity checking load or not is detected, whether all batteries are in an intermittent charging state or not is detected, and the integrated parallel direct current units have no other faults, alarm information and the like, and if the current of the system bus meets the requirement, an instruction is sent to the intelligent management units of all the integrated parallel direct current units, the intelligent management units are carried out one by one from the modules with low serial numbers, the single module starts corresponding capacity checking logic, the AC/DC module is closed firstly, the current equalizing unit is quitted from the system through controlling the current equalizing unit, the voltage reducing DC/DC module is closed at the same time, the voltage reducing DC/DC module is output to adjust the output voltage, so that the integrated parallel direct current units to be checked realize energy bearing by the batteries, the output voltage is adjusted until the discharge current of the battery end is maintained to the preset value, the intelligent management unit immediately uploads the capacity checking data to the edge management terminal in the whole capacity checking process until the battery stops a discharge voltage point or maintains for 10 hours to finish the capacity checking operation;
when an edge management terminal receives a core capacity instruction issued by a background, detecting whether the current of a system bus meets the lowest core capacity load, whether all batteries are in an intermittent charging state, and whether the integrated parallel direct current unit has other faults, alarm information and the like;
when the system edge management terminal function/communication fails and reaches a preset period, the intelligent management unit of the integrated parallel direct current unit of the low-order communication address detects whether a direct current bus is normal at the moment by utilizing CAN communication, detects whether the current of the system bus meets the minimum load of the nuclear capacity, whether a battery is in an intermittent charging state, and whether a converter has other faults, alarm information and the like, and simultaneously or one by one enables the single integrated parallel direct current unit to start corresponding nuclear capacity logic by the edge management terminal module;
when the condition of nuclear capacity termination is reached, the intelligent management unit starts the AC/DC module, recovers a DC400V bus, ensures that the integral parallel direct current unit can be continuously output when the energy bearing is switched to alternating current power supply by the battery, starts the voltage reduction DC/DC module to realize constant current charging, immediately enables the current equalizing unit to recover normal current equalizing logic and is borne by the output DC/DC module, and stops sending nuclear capacity data after the charging state becomes intermittent, thereby completing the nuclear capacity operation of the single integral parallel direct current unit.
Further, the method also comprises the following steps:
the monomer battery with backward capacity is found by means of periodical nuclear capacity, shallow charging and shallow discharging or internal resistance testing, when the monomer battery with backward capacity is found, the battery is charged and discharged, active substances in the battery are activated, the service life of the battery is prolonged, and the service cycle of each battery is maximized;
according to the load data of the direct current bus, at the stage of high power grid price, the edge management terminal is combined, the AC/DC is managed through the module intelligent management unit to realize whether the storage battery is in a charging state or a discharging state, part of modules are in a discharging loading state, and at the stage of low power grid price, the modules are in a charging state;
the system edge management terminal and each unit are monitored through CAN communication, the modules are operated in remote control, remote regulation, remote measurement and remote signaling, data information of each unit is recorded, array management is carried out on each unit after data acquisition, the control unit configures the charging and discharging modes of the battery, so that each unit CAN be charged and discharged independently, CAN be charged and discharged simultaneously, CAN be partially charged, partially discharged in nuclear capacity, partially discharged in shallow charging and shallow discharging and partially detected in internal resistance.
Compared with the prior art, the invention has the following beneficial effects:
by using the edge management terminal and a distributed thinking technology, the power supply reliability of the direct-current power supply system is improved from a system architecture and an array type innovative management mode, and the maintenance-free design of the direct-current power supply system is realized;
the service life of the storage batteries is effectively prolonged, each storage battery can be used to the end point of the service life, and the utilization rate of the storage batteries is improved;
the system realizes the working mode of the array type management module through the edge management terminal, and simultaneously realizes peak clipping, valley filling, energy source utilization and carbon emission reduction assistance.
Drawings
Fig. 1 is a schematic diagram of an array dc power supply system according to an embodiment of the present invention.
Fig. 2 is an internal schematic diagram of an integrated parallel dc power supply unit of an array dc power supply system according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a conventional operating power supply system.
In the figure: 1. an integrated parallel DC power supply unit; 2. an edge management terminal module; 3. a battery; 4. a buck DC/DC module; 5. a voltage open loop boost DC/DC module; 6. an AC/DC module; 7. a DC/DC module; 8. an intelligent management unit; 9. a CAN communication unit; 10. a current equalizing unit; 11. and outputting the step-down DC/DC module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
According to fig. 1 to 3, there is provided an array type dc power supply system including:
the integrated parallel direct-current power supply unit comprises an integrated parallel direct-current power supply unit 1, wherein the integrated parallel direct-current power supply unit 1 is provided with a power supply input end, a direct-current output end and a battery 3, the battery 3 is isolated from the power supply input end and the direct-current output end, a plurality of integrated parallel direct-current power supply units 1 are connected in parallel to form a system, and the batteries 3 of the integrated parallel direct-current power supply units 1 are isolated from each other;
and the edge management terminal module 2 is electrically connected with the integrated parallel direct-current power supply unit 1.
The edge management terminal module 2 is in signal connection with the integrated parallel direct-current power supply units 1 through CAN communication, and records data information of each unit for module remote control, remote regulation, remote measurement and remote signaling operation.
Wherein the battery 3 is electrically coupled with a buck DC/DC module 4 and a voltage open-loop boost DC/DC module 5.
Wherein the buck DC/DC module 4 is electrically coupled with the AC/DC module 6, the DC/DC module 7 and the intelligent management unit 8.
The intelligent management unit 8 is electrically connected with a CAN communication unit 9, a current equalizing unit 10, the voltage open-loop boost DC/DC module 5, the AC/DC module 6 and an output buck DC/DC module 11, the output buck DC/DC module 11 is electrically connected with the voltage open-loop boost DC/DC module 5, and the output buck DC/DC module 11 is electrically connected with the current equalizing unit 10.
Wherein the buck DC/DC module 4 is electrically coupled with the output buck DC/DC module 11 and the DC/DC module 7, and the AC/DC module 6 is electrically coupled with the DC/DC module 7.
The integrated parallel direct-current power supply unit comprises an integrated parallel direct-current power supply unit 1, and is characterized by further comprising a direct-current feeder distribution unit, wherein the direct-current feeder distribution unit is electrically connected with the integrated parallel direct-current power supply unit 1.
Based on another aspect of the embodiment of the present invention, there is provided an array dc power management method based on the above array dc power system, including the following steps:
the battery 3 is isolated from the output end of the direct current bus and the input end of the power supply, and the battery 3 is isolated from each battery 3 in the system;
charging the built-in battery 3 and outputting the charged battery to the direct current bus;
when the front-end direct-current bus is normal, the output voltage value of the output step-down DC/DC converter is lower than that of the output DC/DC converter and is in a standby state;
when the front-end direct-current bus is abnormal or the output voltage of the output DC/DC converter drops to be the same as that of the output buck DC/DC converter, the output buck DC/DC is immediately loaded;
wherein, still include the following step:
the system edge management terminal and each unit are monitored through CAN communication, the modules are operated in remote control, remote regulation, remote measurement and remote signaling, data information of each unit is recorded, array management is carried out on each unit after data acquisition, the control unit configures the charging and discharging modes of the battery 3, so that each unit CAN be charged and discharged independently, CAN be charged and discharged simultaneously, CAN be partially charged, partially discharged in nuclear capacity, partially discharged in shallow charging and shallow discharging and partially detected in internal resistance.
Wherein, still include the following step:
the monomer batteries 3 with backward capacity are found by means of periodic nuclear capacity, shallow charging and shallow discharging or internal resistance testing, when the monomer batteries 3 with backward capacity are found, the batteries 3 are charged and discharged, active substances in the batteries 3 are activated, the service life of the batteries 3 is prolonged, and the service cycle of each battery 3 is maximized;
according to the load data of the direct current bus, at the stage of high power grid price, the edge management terminal is combined, the AC/DC is managed through the module intelligent management unit to realize whether the storage battery is in a charging state or a discharging state, part of the modules are in a discharging loading state, and at the stage of low power grid price, the modules are in a charging state.
Description of the internal operation of the module: the module input can be alternating current input (AC80-280V) and direct current input (DC120V-DC320V), a stable DC400V direct current bus is formed through AC/DC, the direct current bus is used as the input of output DC/DC and step-down DC/DC, wherein the output DC/DC is formed into an output bus containing DC240/220/110/48V, the output of the step-down DC/DC is connected with a battery end and mainly used for charging the battery, a step-down DC/DC converter adopts constant-current constant-voltage charging, the charging is stopped after the constant-current constant-voltage charging is completed, the battery enters a discharging stage, when the battery capacity falls to 5% of a nominal capacity, the charging is restarted, and the battery is in shallow charging and shallow discharging to reach the required backup capacity through the circulation, and the control strategy of intermittent charging management is implemented through an intelligent management unit;
the battery side is simultaneously connected with a boosting DC/DC converter, the output of the converter is controlled in an open loop mode, the output of the converter is connected with an output step-down DC/DC, when a front end DC400V direct current bus is normal, the output voltage value of the output step-down DC/DC converter is slightly lower than that of the output DC/DC converter by about 2V and is in a standby state, once the DC400V is abnormal or the output voltage of the output DC/DC converter drops to be the same as that of the output step-down DC/DC converter, the output step-down DC/DC is immediately carried, the output of a module is ensured to be uninterrupted, and the power supply reliability of a system is ensured.
When the outlet of the feeder switch of the system is short-circuited and large current needs to be output by the module for a short time to drive the feeder switch to be tripped, the intelligent management unit realizes that the output DC/DC and the output step-down DC/DC share the large current output through the control of the current equalizing unit, reduces the output impact of the large current of the output DC/DC converter and improves the reliability of the module.
Remote core capacity principle: the core capacity is that I10 constant current discharge is carried out on the storage battery until the voltage is terminated, remote core capacity is issued to an edge management terminal through a background command, the terminal issues the core capacity command to an intelligent management unit of each integrated parallel direct current unit, after the command is received, the intelligent management unit can detect whether a DC400V bus is normal at the moment, detect whether the current of a system bus meets the lowest load of the core capacity, whether the battery is in an intermittent charging state, and the converter has no other fault/alarm information, and the like, and after the command is met, corresponding core capacity logic is started, firstly, an AC/DC converter is closed, the current equalizing unit is controlled to quit the system current equalization, simultaneously, the step-down DC/DC is closed, and simultaneously, the step-down DC/DC is output to start to adjust the output voltage, so that the integrated parallel direct current unit to be subjected to the core capacity is enabled to provide energy bearing by the battery, and the output voltage is adjusted until the discharge current of the battery end is maintained to the value of I10, the intelligent management unit starts the AC/DC converter at first to recover a DC400V bus until the discharging voltage point of the battery is terminated or the discharging voltage point is maintained for 10 hours to finish the capacitance operation, when the condition is terminated or the condition is maintained for 100ms, the module is ensured to be uninterruptedly output in the process of switching the battery into alternating current power supply, the charging step-down DC/DC converter is started to realize constant current charging, the current equalizing unit is immediately recovered to normal current equalizing logic and is supported by the output DC/DC, in the whole capacitance checking process, the module intelligent management unit immediately uploads capacitance checking data (voltage, current and capacity) to the edge management terminal, and after the charging state becomes intermittent, the intelligent management unit stops sending the capacitance checking data to finish the capacitance operation of the single integrated parallel direct current unit.
The system is innovatively designed into an integrated parallel direct-current power supply unit by fusing a single lithium battery module and a power supply power module (containing AC/DC and charging and discharging DC/DC conversion), and an array direct-current power supply system is formed by connecting a plurality of unit direct-current output ends in parallel.
The system consists of a plurality of integrated parallel direct-current power supply units, an edge management terminal module and a direct-current feeder line distribution unit.
Each integrated parallel direct-current power supply unit consists of a power input end and a direct-current output end, a lithium battery is arranged in a unit module, batteries are isolated from the unit output end and the power input end, when a plurality of units are connected in parallel to form a system, the batteries are isolated from each other, and the load output of the unit is influenced when the input power supply is in power failure when the batteries are abnormal, and the load capacity of a direct-current bus is not influenced. When each integrated parallel power supply unit works, the integrated parallel power supply unit charges a built-in battery and outputs the battery to a direct current bus; when the front-end direct-current bus is normal, the output voltage value of the output step-down DC/DC converter is lower than that of the output DC/DC converter and is in a standby state; when the front-end direct-current bus is abnormal or the output voltage of the output DC/DC converter drops to be the same as that of the output buck DC/DC converter, the output buck DC/DC is immediately carried.
The system edge management terminal and each unit realize monitoring through CAN communication, realize module remote control, remote regulation, remote measurement and remote signaling operation, record the data information of each unit. According to the method, array management is carried out on all units after data are collected, the charging and discharging modes of the unit pair configuration battery can be controlled, all units can be charged and discharged independently and simultaneously, and can be charged and discharged at different times, namely, part of the units are in charging, part of the units are in nuclear capacity discharging, part of the units are in shallow charging and shallow discharging, and part of the units are in internal resistance detection, so that ordered management of all module units is realized. The matrix type energy management is realized through the edge management terminal, and the method is a breakthrough innovation in the aspect of system management.
Through the working mode of the array type management unit, the batteries are effectively managed, the batteries can find out the single batteries with backward capacity in advance through means of periodical capacity checking, shallow charging and shallow discharging, internal resistance testing and the like, the reasonable charging and discharging of the batteries are realized, the service life of the batteries is effectively prolonged, the service cycle of each battery is maximized, and the assets are utilized to the maximum extent.
The matrix type management system can realize whether the storage battery is in a charging or discharging state by managing AC/DC through the module intelligent management unit according to load data of a direct current bus at a high power price peak stage of a power grid in combination with an edge management terminal, and enables partial modules to be in a discharging loading state, and at a valley power price stage of the power grid, the modules are in the charging state, so that the characteristic that the lithium battery can be repeatedly charged and discharged is utilized as much as possible, peak clipping and valley filling are realized, energy conservation and emission reduction are realized, and the utilization rate of the storage battery is furthest improved.
A typical application is to secure cabinets via input switches, power connection cables, edge management terminals, devices as in fig. 2. The method has great practical and popularization values in the aspect of the direct current system (including a communication power supply system) of the transformer/distribution station.
Through the method of the embodiment, 1, the problem of charging management of a single abnormal storage battery on other healthy batteries is solved, the storage battery pack of the conventional direct-current power supply system is composed of a plurality of storage batteries which are connected in series, and once the single storage battery is abnormal or presents certain impedance, the charging current of other normal storage batteries is limited when the whole group of storage batteries are charged, so that the normal storage batteries cannot be fully charged, and the service life of the storage batteries is influenced by undercharging. 2. The problem that a single abnormal storage battery influences the voltage of a direct-current bus when a system discharges is solved, the storage battery pack of a conventional direct-current power supply system is composed of a plurality of storage batteries which are connected in series, and once the single storage battery is abnormal or presents certain impedance, the voltage drop of the output bus under load influences the load. 3. The problem of low utilization rate of a storage battery pack of a conventional direct-current power supply system is solved. 4. China promises to achieve carbon peak reaching in 2030, carbon neutralization in 2060, and electric power is a main industry for reducing carbon, which means that power equipment needs to gradually meet double-carbon requirements. 5. Through the edge management terminal, intelligent operation and maintenance and management of the direct current power supply system can be realized, and a user does not need to participate in the whole process manually, so that the maintenance-free design is realized.
The invention has been described above with reference to embodiments thereof. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention, and these alternatives and modifications are intended to be within the scope of the invention.
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