CN111628564B - Low-voltage intelligent power distribution station power supply system - Google Patents

Low-voltage intelligent power distribution station power supply system Download PDF

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Publication number
CN111628564B
CN111628564B CN202010451006.6A CN202010451006A CN111628564B CN 111628564 B CN111628564 B CN 111628564B CN 202010451006 A CN202010451006 A CN 202010451006A CN 111628564 B CN111628564 B CN 111628564B
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China
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grid
battery
electrically connected
compartment
energy storage
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CN202010451006.6A
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Chinese (zh)
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CN111628564A (en
Inventor
裘华东
卢峰
刘海峰
陈家乾
徐俊
薛钦
毕祥宜
费旭玮
郑松松
李越玮
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Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Publication of CN111628564A publication Critical patent/CN111628564A/en
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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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/635—Control systems based on ambient temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571—Resistive heaters
    • 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
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • 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
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a power supply system for a low-voltage intelligent distribution transformer area, which comprises a monitoring system, a bidirectional inverter, an isolation transformer, a grid-connected and off-grid switching cabinet and an energy storage unit, wherein the monitoring system is connected with the bidirectional inverter; the monitoring system is respectively and electrically connected with the energy storage unit, the bidirectional inverter and the grid-connected and off-grid switch cabinet; the bidirectional inverter is respectively electrically connected with the power grid end and the input end of the isolation transformer; the isolation transformer is electrically connected with the grid-connected and off-grid switch cabinet; the grid-connected and off-grid switching cabinet is electrically connected with a load end; and the energy storage unit is used for providing sustainable electric energy for the transformer area when the power grid fails and is electrically connected with the bidirectional inverter. This scheme can be when battery module takes place the charge-discharge trouble, and the automatic disconnection branch road that charges continues to keep the charge-discharge state of other battery modules, and can be according to fault rate automatically regulated heat sink's operating power, and energy storage system's ambient temperature is improved to quick regulation and control, ensures energy storage system safety, stability, high-efficient operation.

Description

Low-voltage intelligent power distribution station power supply system
Technical Field
The invention relates to the technical field of low-voltage power distribution, in particular to a power supply system of a low-voltage intelligent power distribution station.
Background
The low-voltage distribution system mainly comprises a distribution substation, a high-voltage distribution line, a distribution transformer, a low-voltage distribution line and a plurality of control protection equipment parts, wherein each part plays its own role and completes a distribution task together; in the practical situation, sudden power failure accidents caused by grid faults can be met, and the power utilization end cannot be supplemented with power supplies, so that large-scale shutdown and production halt can be caused, and inconvenience is brought to production and life of people; therefore, the electric power company can dispatch the power supply car and go to distribute the electric terminal and supply power for the power consumption end continuously, because the energy storage unit has in the power supply car, the energy storage unit mainly comprises a plurality of and the battery cluster of establishing ties, when the power supply of electric wire netting end is normal, the energy storage unit is charged, when the power supply trouble of electric wire netting end, the energy storage unit replaces the electric wire netting to supply power for the power consumption end, and the charging and discharging in-process of energy storage unit, the temperature of battery cluster has very big influence to the efficiency of charging and discharging, general power supply car all can install the air conditioner and regulate and control the ambient temperature of energy storage unit, but a large amount of electric energy will be consumed to the air conditioner itself, secondly, the refrigeration of air conditioner and the efficiency of heating are not high, can not fast regulate and control the ambient temperature of energy storage unit.
The operation, maintenance and management of the series storage battery pack mainly comprises the following steps: detecting out a lagging fault battery by measuring parameters such as terminal voltage, internal resistance and temperature of the storage battery and analyzing and judging; and (4) checking the capacity of the storage battery pack regularly, wherein the discharge capacity of the storage battery pack is required to be not lower than 80% of rated capacity and the like. However, despite the maintenance work, there still exist the problems that open-circuit fault cells cannot be found in time, and when some storage batteries are open-circuited, the storage battery pack cannot continue to supply working current to the load in time, which greatly reduces the stability and reliability of system operation.
Disclosure of Invention
The invention aims to solve the problem that the charging and discharging of an energy storage system in a mobile power supply vehicle have faults to influence the power supply of a distribution room, and provides a low-voltage intelligent power supply system for the distribution room.
In order to achieve the technical purpose, the invention provides a technical scheme that a low-voltage intelligent power distribution station power supply system comprises a monitoring system, a bidirectional inverter, an isolation transformer, a grid-connected and off-grid switching cabinet and an energy storage unit;
the monitoring system is used for monitoring the running state of each electric device in the transformer area and is respectively and electrically connected with the energy storage unit, the bidirectional inverter and the grid-connected and off-grid switching cabinet;
the bidirectional inverter is used as a medium for energy bidirectional transfer between the energy storage unit and the power grid and is respectively and electrically connected with the power grid end and the input end of the isolation transformer;
the isolation transformer is used for avoiding the influence of voltage and current of a load end on a power grid end, ensuring the power distribution safety and electrically connected with the grid-connected and off-grid switch cabinet;
the grid-connected and off-grid switching cabinet realizes automatic switching of grid connection and off-grid, provides required electric energy for a load end, and is electrically connected with the load end;
the energy storage unit is used for providing sustainable electric energy for the transformer area when the power grid fails and is electrically connected with the bidirectional inverter;
the energy storage unit is including battery module, battery management system and charge-discharge protection device, battery module is used for the storage electric energy, battery management module is used for controlling battery module's charge-discharge rate, charge-discharge protection device is used for protecting battery module's charge-discharge safety, battery management system and charge-discharge protection device are connected with battery module's charge-discharge end electricity respectively. In the scheme, the monitoring system is the highest control mechanism of the power supply device in the transformer area, has the highest control authority and is responsible for monitoring and controlling all administered equipment in the transformer area; the battery management system consists of an acquisition module and a master control management module, wherein the acquisition module is used for acquiring the ambient temperature information of the energy storage unit in real time, and the master control management module controls the charging and discharging rate and the ambient temperature of the energy storage unit; when the power grid fails, the bidirectional inverter converts the electric energy of the energy storage unit into the power supply electric energy of the load end, and stable power supply of the load end is guaranteed.
The battery module comprises a battery box, a control compartment, a battery pack compartment and a heat dissipation compartment are arranged in the battery box, the heat dissipation compartment is arranged at the bottom end of the battery pack compartment, and a plurality of battery module separation grooves are arranged in the battery pack compartment in an array manner; battery modules are arranged in the battery module separation grooves, the battery management system is arranged in the control compartment, a wire arranging terminal is arranged at the upper end of the control compartment, and power output leads of the battery modules are sequentially welded on the wire arranging terminal to form a battery pack; the battery pack compartment is internally provided with a battery pack, and the battery pack compartment is internally provided with a battery pack; the side all around of heat dissipation compartment sets up the heat hole of fanning, be provided with netted distribution's isolation support between heat dissipation compartment and the battery package compartment, the fixed heat radiation equipment that is provided with of lower extreme of isolation support. The battery management system is used for collecting temperature information of the battery pack, further controlling the heating equipment and the radiating equipment to be turned on and turned off, ensuring that the temperature of the battery is within a proper range, and ensuring efficient, safe and stable operation of the battery.
Preferably, the charge and discharge protection device comprises a PCB (printed circuit board), a plurality of charge and discharge protection circuits are arranged on the PCB, each charge and discharge protection unit is connected with one battery module in parallel, each charge and discharge protection circuit comprises a freewheeling diode D, the cathode end of the freewheeling diode D is electrically connected with the anode end of the storage battery B, the anode end of the freewheeling diode D is electrically connected with the first end of the relay K11, and the second end of the relay K11 is electrically connected with the cathode end of the storage battery B; the negative pole end of freewheeling diode D is connected with warning light L's first end electricity, warning light L's second end and normally open contact J11 first end electricity are connected, normally open contact J11 second end and normally open contact J12 first end electricity are connected, normally open contact J12 second end is connected with relay K's first end electricity, normally open contact J12 first end is connected with current-limiting resistance R first end electricity, current-limiting resistance R's second end and relay K12 first end electricity are connected, relay K12's second end and warning light L's first end electricity are connected. According to the scheme, each battery module is formed by connecting a plurality of single batteries in series according to design requirements, when one single storage battery is disconnected, the charging and discharging protection circuit starts to work, and the fault battery module is short-circuited, so that the charging and discharging functions of the storage battery are normal, and meanwhile, the alarm lamp L is lightened, so that maintenance personnel can specifically know which single battery is open; the cooling circuit is started, the fan dissipates heat of the inner space, the operating power of the fan can be adjusted according to the number of fault points, the number of the fault points is more, the operating power of the fan is higher, the heat of the inner space is dissipated, the phenomenon of local overheating of the circuit caused by circuit faults is avoided, and the service life of the battery is prolonged.
Preferably, the heat dissipation device is a cooling fan, and the cooling fan is electrically connected with the controller.
Preferably, a clearance channel is reserved between the battery module separation grooves, and a heating device is arranged in the clearance channel.
In this scheme, battery module compartment is provided with clearance passageway and is convenient for thermal diffusion and heat dissipation
Preferably, the heating device is a PTC heater, the PTC heater is an integrally connected heating tube made of a PTC heating sheet, the heating tube extends in the clearance channel, and a power supply input end of the PTC heater is electrically connected with the controller.
In the scheme, the PTC heater has constant heating temperature, and does not have the phenomenon of red and open fire, thereby ensuring the safety of the battery pack.
Preferably, the heating pipe is coated with a ceramic coating.
In this scheme, the ceramic coating has insulating and heat-conducting properties.
Preferably, the ceramic coating has a thickness of 0.2 mm.
The ceramic coating with the thickness of 0.2mm can bear the voltage of 2kv, and the service life of the heater is prolonged.
A plurality of heat dissipation holes are formed in the top cover of the battery pack.
In the scheme, hot air can be discharged from a plurality of fan hot holes on the top cover.
The invention has the beneficial effects that: the power supply system of the low-voltage intelligent power distribution station area is provided with the heating equipment, the heat dissipation equipment and the charging and discharging protection circuit, and can control the heating equipment and the heat dissipation equipment to be turned on and off according to the environmental temperature value of the energy storage unit fed back by the battery management system, so that the temperature of the heating equipment is adjustable, the power of the heat dissipation equipment is adjustable, the temperature of a battery pack is cooperatively adjusted, and the stable, safe and efficient operation of the battery pack is ensured; when charge and discharge break down, the battery module that charges and discharges can the troubleshooting, continues to keep the charge-discharge state of other battery modules, and can be according to the operating power of fault point dynamic adjustment cooling fan, high-efficient quick cooling purpose that reaches.
Drawings
Fig. 1 is a schematic structural diagram of a low-voltage intelligent distribution station power supply system according to the present invention.
Fig. 2 is a battery module structure diagram of a low-voltage intelligent distribution station power supply system according to the present invention.
Fig. 3 is an internal structural view of a battery module of a low-voltage intelligent distribution substation power supply system according to the present invention.
Fig. 4 is a structural diagram of a heat dissipation device of a power supply system of a low-voltage intelligent power distribution station area according to the present invention.
Fig. 5 is a structural diagram of a heating device of a low-voltage intelligent distribution station power supply system.
Fig. 6 is a structural diagram of a trigger of a power supply system of a low-voltage intelligent power distribution station area.
Fig. 7 is a single charge-discharge protection circuit diagram of a low-voltage intelligent distribution station power supply system according to the invention.
Fig. 8 is a diagram of a plurality of charging and discharging protection circuits of a power supply system of a low-voltage intelligent distribution station area according to the present invention.
The notation in the figure is: 11-a monitoring system, 12-a bidirectional inverter, 13-an isolation transformer, 14-a grid-connected and off-grid switching cabinet, 15-a battery management system, 16-a battery module, 17-a charge-discharge protection device, 1-a battery box, 2-a control compartment, 3-a battery pack compartment, 4-a heat dissipation compartment, 21-a flat cable terminal, 31-a battery module separation groove, 32-a clearance channel, 41-a heat dissipation device, 42-an isolation bracket, 5-a heating device, 7-a fire-fighting pipeline and 8-a trigger.
Detailed Description
For the purpose of better understanding the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention with reference to the accompanying drawings and examples should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and not for limiting the scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the scope of the present invention.
Example (b): as shown in fig. 1, a structure diagram of a power supply device for a low-voltage distribution transformer area comprises a monitoring system 11, a bidirectional inverter 12, an isolation transformer 13, a grid-connected and off-grid switching cabinet 14 and an energy storage unit, wherein the monitoring system 11 is used for monitoring the operation status of each electric device in the transformer area, and is electrically connected with the energy storage unit, the bidirectional inverter 12 and the grid-connected and off-grid switching cabinet 14; the bidirectional inverter 12 is used as a medium for energy bidirectional transfer between the energy storage unit and the power grid, and is respectively electrically connected with the power grid end, the charging end of the battery module 16 and the input end of the isolation transformer 13; the isolation transformer 13 is used for avoiding the influence of voltage and current of a load end on a power grid end, ensuring the power distribution safety and electrically connected with the grid-connected and off-grid switch cabinet 14; the grid-connected and off-grid switching cabinet 14 is used for realizing automatic switching of grid connection and off-grid, providing required electric energy for a load end and electrically connecting the load end; the energy storage unit is used for providing sustainable electric energy for the transformer area when the power grid fails and is electrically connected with the bidirectional inverter; the energy storage unit is including battery module 16, battery management system 15 and charge-discharge protection device 17, battery module 16 is used for the storage electric energy, battery management module 15 is used for controlling battery module's charge-discharge rate, charge-discharge protection device 17 is used for protecting battery module's charge-discharge safety, battery management system 15 and charge-discharge protection device 17 are connected with battery module 16's charge-discharge end electricity respectively.
In this embodiment, the monitoring system 11 is a human-computer interaction platform of the EMS energy management system, can visually display the state and data of the system in real time, is a highest control mechanism of the power supply device in the transformer area, has the highest control authority, and is responsible for monitoring and controlling all jurisdictional devices in the transformer area, and an operator can clearly know all parameters of the mobile energy storage unit and participate in monitoring and controlling; the battery management system 15 is composed of an acquisition module and a main control management module, wherein the acquisition module is used for acquiring the ambient temperature information of the energy storage unit in real time, and the main control management module controls the charging and discharging rate and the ambient temperature of the energy storage unit; when the power grid fails, the bidirectional inverter 12 converts the electric energy of the energy storage unit into the power supply electric energy of the load end, and the stable power supply of the load end is ensured.
As shown in fig. 2, a structure diagram of a power battery pack protection device includes a battery box 1, a control compartment 2, a battery pack compartment 3 and a heat dissipation compartment 4 are arranged in the battery box 1, the heat dissipation compartment 4 is arranged at the bottom end of the battery pack compartment 3, a top cover of the battery pack is provided with a plurality of heat dissipation holes, and hot air can be discharged from the heat dissipation holes on the top cover; as shown in fig. 3, a plurality of battery module slots 31 are arranged in an array in the battery pack compartment 3; the battery module separation grooves 31 are all internally provided with battery modules, the control compartment 2 is internally provided with a controller, the upper end of the control compartment 2 is provided with a wire arranging terminal 21, and power output leads of a plurality of battery modules are sequentially welded on the wire arranging terminal 21 to form a battery pack; be provided with heat dissipation device 41 in the heat dissipation compartment, still be provided with the firing equipment 5 that is used for heating the battery package in the battery package compartment 3, firing equipment 5 and firing equipment 41 all are connected with the controller electricity, the side all around of heat dissipation compartment 4 sets up the heat dissipation hole, is provided with netted distribution's isolation support 42 between heat dissipation compartment 4 and the battery package compartment 3, the fixed heat dissipation device 41 that is provided with of lower extreme of isolation support 42.
In this embodiment, the battery module can be placed at the upper end of the isolation bracket 42, the heat dissipation device 41 at the lower end is opened, so that heat is dissipated from the upper end of the battery box 1, because the rising speed of hot air is high, the heat dissipation device 41 can dissipate heat more quickly when being arranged at the lower end of the battery pack, and the peripheral side surfaces of the heat dissipation compartment 4 are provided with heat dissipation holes, so that gas circulation is facilitated; according to the temperature information of the energy storage unit environment collected by the battery management system 15, the heating device 5 and the heat dissipation device 41 are further controlled to be turned on and turned off, the temperature of the battery is guaranteed to be in a proper range, and efficient, safe and stable operation of the battery is guaranteed.
As shown in fig. 4, the heat dissipation device 41 is a cooling fan, and the cooling fan is electrically connected to the controller; the battery module compartment is provided with a clearance channel 32 to facilitate heat diffusion and heat dissipation; as shown in fig. 5, a clearance passage 32 is left between the battery module separation grooves 31, and a heating device is arranged in the clearance passage 32; the heating device is a PTC heater, the PTC heater is a heating pipe which is made of PTC heating sheets and is communicated into a whole, the heating pipe extends in the gap channel 32, a layer of ceramic coating is coated on the heating pipe, the thickness of the ceramic coating is 0.2mm, the ceramic coating has insulating and heat conducting properties, the ceramic coating with the thickness of 0.2mm can bear the voltage of 2kv, and the operation life of the heater is prolonged; the power supply input end of the PTC heater is electrically connected with the controller; the PTC heater has constant heating temperature, and does not have the phenomena of red and open fire, thereby ensuring the safety of the battery pack; the heating pipe is coated with a ceramic coating.
As shown in fig. 3, the present embodiment is further provided with a fire fighting device, which comprises a fire fighting pipeline 7 and a fire extinguisher (not shown), wherein the fire fighting pipeline 7 is arranged at the top of the inner side of the battery box 1, passes through the area of the battery pack compartment 3, and has one end connected with the fire extinguisher; as shown in fig. 6, trigger 8, install in fire control pipeline 7 downside, and be equipped with the through-hole with fire control pipeline 7 intercommunication, the sealing plug of specific melting point is filled in the through-hole, and the sealing plug uses paraffin to make as the main material, and in addition when ambient temperature was too high, trigger 8's sealing plug can melt for the inside and outside of intercommunication fire control pipeline 7 is connected to the through-hole, makes the gas of fire extinguisher discharge from the through-hole because of the atmospheric pressure difference, plays the effect of putting out a fire. The fire-fighting measure reduces the dependence on electronic components and improves the reliability.
The charge and discharge protection device comprises a PCB (printed circuit board), wherein a plurality of charge and discharge protection circuits are arranged on the PCB, each charge and discharge protection unit is connected with one battery module in parallel, as shown in fig. 7, each charge and discharge protection circuit comprises a fly-wheel diode D, the cathode end of the fly-wheel diode D is electrically connected with the anode end of the storage battery B, the anode end of the fly-wheel diode D is electrically connected with the first end of the relay K11, and the second end of the relay K11 is electrically connected with the cathode end of the storage battery B; the negative pole end of freewheeling diode D is connected with warning light L's first end electricity, warning light L's second end and normally open contact J11 first end electricity are connected, normally open contact J11 second end and normally open contact J12 first end electricity are connected, normally open contact J12 second end is connected with relay K's first end electricity, normally open contact J12 first end is connected with current-limiting resistance R first end electricity, current-limiting resistance R's second end and relay K12 first end electricity are connected, relay K12's second end and warning light L's first end electricity are connected. In the embodiment, according to design requirements, each battery module is formed by connecting a plurality of single batteries in series, when one single storage battery is disconnected, the charge-discharge protection circuit starts to work to short-circuit a fault battery module, so that the charge-discharge function of the storage battery is ensured to be normal, and meanwhile, the alarm lamp L is lightened, so that a maintainer can specifically know which single battery is open; the cooling circuit is started, the fan dissipates heat of the inner space, the operating power of the fan can be adjusted according to the number of fault points, the number of the fault points is more, the operating power of the fan is higher, the heat of the inner space is dissipated, the phenomenon of local overheating of the circuit caused by circuit faults is avoided, and the service life of the battery is prolonged.
As shown in fig. 8, a battery module is provided, which is formed by connecting two single batteries in series and has two charging protection circuits, wherein the positive terminal of the battery B1 is electrically connected with the cathode terminal of the freewheeling diode D1, the anode terminal of the freewheeling diode D1 is electrically connected with the first terminal of the relay K1, and the second terminal of the relay K1 is electrically connected with the cathode terminal of the battery B1; the positive end of the storage battery B2 is electrically connected with the cathode end of the freewheeling diode D2, the anode end of the freewheeling diode D2 is electrically connected with the first end of the relay K2, and the second end of the relay K1 is electrically connected with the cathode end of the storage battery B1; the first end of the alarm lamp L1 is electrically connected with the cathode end of the freewheeling diode D1, the second end of the alarm lamp L1 is electrically connected with the first end of a normally open contact J3, the second end of a normally open contact J3 is electrically connected with the first end of a normally open contact J1, the second end of the normally open contact J1 is electrically connected with the first end of a relay K1, the first end of the normally open contact J1 is electrically connected with the first end of a current-limiting resistor R1, the second end of the current-limiting resistor R1 is electrically connected with the first end of a relay K3, and the second end of the relay K3 is electrically connected with the first end of the alarm lamp L1; the first end of warning lamp L2 is connected with freewheel diode D2's negative pole end electricity, the second end and the normally open contact J4 first end electricity of warning lamp L2 are connected, normally open contact J4 second end and normally open contact J2 first end electricity are connected, normally open contact J2 second end is connected with relay K1's first end electricity, normally open contact J2 first end is connected with current-limiting resistance R2 first end electricity, current-limiting resistance R2's second end and relay K4 first end electricity are connected, relay K4's second end and warning lamp L2's first end electricity are connected.
The specific steps of fault elimination of the charge and discharge protection circuit are as follows:
when the storage battery B1 is in an open circuit, the current-limiting diode D1 generates a short-time delay current, and the relay K1 is switched on; the relay action leads to normally opening contact J1 actuation, and when the actuation of J1, relay K3 switches on for normally opening contact J3 actuation, warning light L1 lights, and when the actuation of relay K3, the fan begins the operation with power W1, and the local busbar cooling in the independent space avoids the emergence of bigger trouble.
When the storage battery B2 is in an open circuit, the freewheeling diode D2 generates a short-time delay current, and the relay K2 is switched on; the action of the relay K2 causes the attraction of a normally open contact J2, the attraction of J2 is realized, and simultaneously, the relay K4 is switched on, so that the attraction of the normally open contact J4 is realized, an alarm lamp L2 is lightened, and the fan starts to operate with the power W2, wherein W2 is larger than W1.
The above-mentioned embodiments are preferred embodiments of the power supply system for low-voltage intelligent distribution substations, and the scope of the invention is not limited thereto, and the invention includes and is not limited thereto, and all equivalent changes in shape and structure according to the invention are within the protection scope of the invention.

Claims (8)

1. The utility model provides a low pressure intelligent power distribution platform district power supply system which characterized in that: the system comprises a monitoring system, a bidirectional inverter, an isolation transformer, a grid-connected and off-grid switch cabinet and an energy storage unit;
the monitoring system is used for monitoring the running state of each electric device in the transformer area and is respectively and electrically connected with the energy storage unit, the bidirectional inverter and the grid-connected and off-grid switching cabinet;
the bidirectional inverter is used as a medium for energy bidirectional transfer between the energy storage unit and the power grid and is respectively and electrically connected with the power grid end and the input end of the isolation transformer;
the isolation transformer is used for avoiding the influence of voltage and current of a load end on a power grid end, ensuring the power distribution safety and electrically connected with the grid-connected and off-grid switch cabinet;
the grid-connected and off-grid switching cabinet realizes automatic switching of grid connection and off-grid, provides required electric energy for a load end, and is electrically connected with the load end;
the energy storage unit is used for providing sustainable electric energy for the transformer area when the power grid fails and is electrically connected with the bidirectional inverter;
the energy storage unit comprises a battery module, a battery management system and a charging and discharging protection device, wherein the battery module is used for storing electric energy, the battery management system is used for controlling the charging and discharging speed of the battery module, the charging and discharging protection device is used for protecting the charging and discharging safety of the battery module, and the battery management system and the charging and discharging protection device are respectively and electrically connected with the charging and discharging end of the battery module;
the battery module comprises a battery box, a control compartment, a battery pack compartment and a heat dissipation compartment are arranged in the battery box, the heat dissipation compartment is arranged at the bottom end of the battery pack compartment, and a plurality of battery module separation grooves are arranged in the battery pack compartment in an array manner;
battery modules are arranged in the battery module separation grooves, the battery management system is arranged in the control compartment, a wire arranging terminal is arranged at the upper end of the control compartment, and power output leads of the battery modules are sequentially welded on the wire arranging terminal to form a battery pack; the battery pack compartment is internally provided with a battery pack, and the battery pack compartment is internally provided with a battery pack; the side all around of heat dissipation compartment sets up the heat hole of fanning, be provided with netted distribution's isolation support between heat dissipation compartment and the battery package compartment, the fixed heat radiation equipment that is provided with of lower extreme of isolation support.
2. A low voltage intelligent distribution substation power supply system according to claim 1, characterized in that:
the charging and discharging protection device comprises a PCB (printed circuit board), a plurality of charging protection circuits are arranged on the PCB, each charging protection unit is connected with one battery module in parallel, each charging protection circuit comprises a fly-wheel diode D, the cathode end of the fly-wheel diode D is electrically connected with the anode end of the storage battery B, the anode end of the fly-wheel diode D is electrically connected with the first end of the relay K11, and the second end of the relay K11 is electrically connected with the cathode end of the storage battery B; the negative pole end of freewheeling diode D is connected with warning light L's first end electricity, warning light L's second end and normally open contact J11 first end electricity are connected, normally open contact J11 second end and normally open contact J12 first end electricity are connected, normally open contact J12 second end is connected with relay K's first end electricity, normally open contact J12 first end is connected with current-limiting resistance R first end electricity, current-limiting resistance R's second end and relay K12 first end electricity are connected, relay K12's second end and warning light L's first end electricity are connected.
3. A low voltage intelligent distribution substation power supply system according to claim 1, characterized in that: the heat dissipation device is a cooling fan, and the cooling fan is electrically connected with the controller.
4. A low voltage intelligent distribution substation power supply system according to claim 1, characterized in that:
a clearance channel is reserved between the battery module separation grooves, and a heating device is arranged in the clearance channel.
5. The system of claim 4, wherein the system further comprises: the heating device is a PTC heater, the PTC heater is a heating pipe which is made of PTC heating sheets and communicated integrally, the heating pipe extends in the gap channel, and the power input end of the PTC heater is electrically connected with the controller.
6. The system of claim 5, wherein the system further comprises:
the heating pipe is coated with a ceramic coating.
7. The system of claim 6, wherein the system further comprises:
the thickness of the ceramic coating is 0.2 mm.
8. A low voltage intelligent distribution substation power supply system according to claim 2, characterized in that:
a plurality of heat dissipation holes are formed in the top cover of the battery pack.
CN202010451006.6A 2020-05-25 2020-05-25 Low-voltage intelligent power distribution station power supply system Active CN111628564B (en)

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US6856162B1 (en) * 2004-02-12 2005-02-15 Vena Engineering Corp AC/DC monitor system
CN103872784A (en) * 2012-12-07 2014-06-18 北汽福田汽车股份有限公司 Energy storage power supply cabinet and on-grid and off-grid power supply systems comprising the same
CN204258300U (en) * 2014-12-15 2015-04-08 上海豫源电力科技有限公司 Supplying power allocation safeguards system
US10330704B2 (en) * 2016-08-25 2019-06-25 Karl E. Hase System of electrical fixtures with integral current monitoring, telemetry, remote control, safety and sensory features
CN108832647A (en) * 2018-06-21 2018-11-16 江苏英耐杰新能源有限公司 A kind of battery energy storage system for power distribution network peak load shifting
CN111048716A (en) * 2019-12-31 2020-04-21 安徽星玛新能源有限公司 Battery pack with stable structure

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