CN106981917A - A kind of combined DC electric power system - Google Patents
A kind of combined DC electric power system Download PDFInfo
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- CN106981917A CN106981917A CN201710339468.7A CN201710339468A CN106981917A CN 106981917 A CN106981917 A CN 106981917A CN 201710339468 A CN201710339468 A CN 201710339468A CN 106981917 A CN106981917 A CN 106981917A
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- power
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
Abstract
The present invention provides a kind of combined DC electric power system, belongs to power supply technique field；System includes a power supply unit and multiple power units, and power supply unit is connected with each power unit, is connected in parallel to each other between each power unit respectively by a dc bus.Each power unit includes multiple electrical equipments, charge-discharge modules, modular converter, parallel module and monitoring module.The beneficial effect of above-mentioned technical proposal is：The problems such as can solve the problem that current electricity consumption peak-valley difference, reduce and rationally utilize the efficient application of distribution capacity and distributed power generation power supply, reaches efficient stable, the effect of energy-conserving and environment-protective.
Description
Technical field
The present invention relates to power supply technique field, more particularly to a kind of combined DC electric power system.
Background technology
One problem of existing transmission and distribution network generally existing is serious electricity consumption " peak-valley difference ", or even peak in some cases
Paddy ratio can reach more than 4 times.The existing technological means for being used to solve peak-valley difference serious problems in electric terminal is in distribution end
Distribution capacity is increased to solve.But being on the rise and the problems such as environment constantly deteriorates with environmental energy problem, merely
Increase distribution capacity and do not meet the policies of existing energy-conserving and environment-protective increasingly, can cause great investment waste, energy waste and
Energy loss.
Also, outside distributed power source is to access transmission and distribution network, it is necessary to by inversion ability access user terminal, and
The energy loss that inverter inversion is produced is equally very important, and be reverse into the conversion efficiency of 50Hz industrial-frequency alternating currents it is universal compared with
It is low.
To sum up, a kind of efficient, energy-conservation, power supply mode that is stable and being easily achieved are not found in the prior art solves peak
The problem of paddy difference is serious.
The content of the invention
According to the above-mentioned problems in the prior art, a kind of technical scheme of combined DC electric power system is now provided,
Current electricity consumption peak-valley difference is aimed to solve the problem that, reduces and is rationally asked using efficient application of distribution capacity and distributed power generation power supply etc.
Topic, reaches efficient stable, the effect of energy-conserving and environment-protective.
Above-mentioned technical proposal is specifically included：
A kind of combined DC electric power system, wherein, including a power supply unit and multiple power units, the power supply
Unit is connected with each power unit respectively by a dc bus, is connected in parallel to each other between each power unit；
Include respectively in each power unit：
Charge-discharge modules, connect the dc bus, for obtaining electric energy from the dc bus；
Modular converter, connects the charge-discharge modules, and connects each electrical equipment in the power unit respectively, is used for
The charge-discharge modules are changed in the electric energy that the dc bus is obtained, to supply each electrical equipment work institute
Electric energy；
Parallel module, connects the charge-discharge modules, the power unit by the parallel module in parallel
In the dc bus for accessing the combined DC electric power system；
Monitoring module, connects the charge-discharge modules and the parallel module, and connect by a communication bus respectively
To said supply unit, for gathering the electricity consumption status information in the power unit and exporting；
Also include a control unit in the combined DC electric power system, the communication bus is connected to, for passing through
The communication bus obtains the electricity consumption status information that the monitoring module in each power unit is gathered and exported,
To be monitored to each power unit；
Described control unit is additionally operable to for controlling the control signal of the power unit to be passed by the monitoring module
Each power unit is handed to, to control each power unit to work.
It is preferred that, the combined DC electric power system, wherein, also include in each power unit：
Battery, the combined DC electric power system is accessed by the charge-discharge modules and the parallel module
In the dc bus；
When the electric power of the power unit is less than the distribution capacity of the dc bus, and the electric power and institute
When stating the difference between distribution capacity not less than a predetermined threshold value, the dc bus passes through the charge-discharge modules and provides described
Needed for power unit normal work while electric energy, the charge-discharge modules perform charging operations to the battery；And
When the electric power is not less than the distribution capacity, the battery is performed by the charge-discharge modules and put
It is electrically operated, to carry out supplementary power to the power unit.
It is preferred that, the combined DC electric power system, wherein, the predetermined threshold value is the 20% of the distribution capacity.
It is preferred that, the combined DC electric power system, wherein, also include in each power unit：
Distributed power source input interface, connects the charge-discharge modules, and the distributed power source for providing outside accesses institute
State power unit and power.
It is preferred that, the combined DC electric power system, wherein, the modular converter includes：
First modular converter, for the dc source in the dc bus to be converted into the electrical equipment normal work
Required dc source simultaneously supplies the electrical equipment；And/or
Second modular converter, for the dc source in the dc bus to be converted into the electrical equipment normal work
Required AC power simultaneously supplies the electrical equipment.
It is preferred that, the combined DC electric power system, wherein, described control unit is also connected by a telecommunication unit
To outside remote monitoring unit, for providing remote monitoring service to the remote monitoring unit.
It is preferred that, the combined DC electric power system, wherein, the supply input source outside said supply unit connection, with
To the electric energy needed for the power unit offer work；
The supply input source includes：
Civil power input source；And/or
Photovoltaic electric energy input source；And/or
Wind-powered electricity generation input source；And/or
Batteries to store energy input source.
It is preferred that, the combined DC electric power system, wherein, also include in each power unit：
Switch module, connects the parallel module, the break-make for controlling the parallel module；
When the combined DC electric power system uses the working method of centralized charging, the switch module control is described
Parallel module is opened, and each electrical equipment in each power unit is respectively by needed for the dc bus acquisition work
The electric energy；And
When the combined DC electric power system uses the working method of independent charging, the switch module control is described
Parallel module is closed, and each electrical equipment in each power unit is respectively by needed for the battery acquisition work
The electric energy.
The beneficial effect of above-mentioned technical proposal is：A kind of combined DC electric power system is provided, current electricity consumption is can solve the problem that
Peak-valley difference, reduce and rationally using the efficient application of distribution capacity and distributed power generation power supply the problems such as, reach efficient stable, save
The effect of energy environmental protection.
Brief description of the drawings
Fig. 1 be the present invention preferred embodiment in, a kind of general structure schematic diagram of combined DC electric power system；
Fig. 2 be the present invention preferred embodiment in, using the power consumption of combined DC electric power system in the present invention
Changed power schematic diagram.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
Based on the above-mentioned problems in the prior art, a kind of combined DC electric power system, the knot of the system are now provided
Structure is specific as shown in figure 1, being divided including a power supply unit A and multiple power unit B, power supply unit A by a dc bus C
It is not connected, therefore is connected in parallel to each other between each power unit B with each power unit B；
Further, include respectively in each power unit B：
Charge-discharge modules B1, connects dc bus C, for obtaining electric energy from dc bus C；
Modular converter B2, connects charge-discharge modules B1, and each electrical equipment B3 in connection power unit B respectively, is used for
Charge-discharge modules B1 is changed in the provided electric energy of acquired in dc bus C or battery B6 electric discharges, to supply
Each electrical equipment B3 work electric energy used；
Parallel module B4, connects charge-discharge modules B1, and power unit B passes through parallel module B4 access groups in parallel
In the dc bus C of box-like DC power-supply system；
Monitoring module B5, connects charge-discharge modules B1 and parallel module B4, and be connected to by a communication bus D respectively
Power supply unit A, for gathering the electricity consumption status information in power unit B and exporting；
Also include a control unit E in combined DC electric power system, be connected to communication bus D, for total by communication
Line D obtains the electricity consumption status information that the communication module B5 in each power unit B is gathered and exported, with to each power unit B
It is monitored.
Above-mentioned control unit E will also be transferred to each use for controlling power unit B control signal by monitoring module B5
Electric unit B, to control each power unit B to work.Specifically, above-mentioned control signal can for current signal, voltage signal or
Pulsewidth modulation (PWM) signal, and other digitlization (i.e. digital) control signals.
Specifically, in the present embodiment, above-mentioned power supply unit A is supplied to each normal works of power unit B by dc bus C
Direct current energy needed for making.For each power unit B, it is connected in parallel on dc bus C, and passes through charge-discharge modules
B1 obtains dc bus C electric energy, and each electrical equipment B3 is delivered to after being changed by modular converter B2 and is worked.
In the present embodiment, a monitoring can also be included in each power unit B in combinations thereof formula DC power-supply system
Module B5, monitoring module B5 are connected to power supply unit A by a communication bus D, to gather corresponding by communication bus D
Electricity consumption status information in power unit B is simultaneously exported.Specifically, above-mentioned electricity consumption status information can be the current of electrical equipment B3
Power, power unit B current total power and other be related to power unit B/ electrical equipments B3 electricity consumption status information.
In the present embodiment, above-mentioned monitoring module B5 is also connected to the control unit E outside one by communication bus D, and
The electricity consumption status information collected is sent to control unit E by communication bus D, to realize that power unit B's uses electricity condition
Monitoring.
In the present embodiment, correspondingly, above-mentioned monitoring module B5 is also by above-mentioned control unit E generations for controlling each electricity consumption
The control signal of unit B work is transferred in each power unit B, to control each power unit B working condition, for example, control each
Each electrical equipment B3's in power unit B is turned on and off, and controls each electrical equipment B3 in each power unit B to enter peak electricity
Or paddy electricity operational mode etc..
Concrete structure in one power unit B is only shown, remaining power unit B structure is slightly same, no longer one by one in Fig. 1
Show.
Two electrical equipment B3 are only shown in a power unit B, one power unit B in actual use in Fig. 1
Multiple electrical equipment B3 are inside potentially included, be will not be repeated here.
Then correspondingly, a modular converter B2 is only shown in Fig. 1, then can be in a power unit B in actual use
It is interior that multiple modular converter B2 are set.
In the preferred embodiment of the present invention, still as shown in figure 1, also including in each power unit B：
Battery B6, the direct current for accessing combined DC electric power system by charge-discharge modules B1 and parallel module B4 is female
In line C；
When power unit B distribution capacity of the electric power less than power supply unit A, and between electric power and distribution capacity
Difference be not less than a predetermined threshold value when, dc bus C pass through charge-discharge modules B1 provide power unit B normal works needed for electricity
While energy, charge-discharge modules B1 performs charging operations to battery B6；And
When electric power is not less than distribution capacity, battery B6 performs discharge operation by charge-discharge modules B1, with right
Power unit B carries out supplementary power.
Specifically, in the present embodiment, one of them of above-mentioned battery B6 act as helping dc bus C to electrical equipment
B3 supplementary powers, i.e., when power supply unit A powers abundance, dc bus C independently can power to electrical equipment B3, when power supply is single
When first A powers inadequate, dc bus C is while power supply unit A powers by battery B6 supplementary powers.
Further, so-called power supply unit A powers abundance, refers to that power unit B electric power is less than power supply unit A's
Distribution capacity, and difference therein is not less than a predetermined threshold value.Specifically, the predetermined threshold value can be the 20% of distribution capacity,
When i.e. power unit B electric power is less than the 80% of power supply unit A distribution capacity, it is believed that now power supply unit A, which powers, fills
Foot, charge-discharge modules B1 performs charging operations to battery B6.
So-called power supply unit A electricity shortages, refer to that power unit B electric power matches somebody with somebody electric capacity not less than power supply unit A
Amount, now charge-discharge modules B1 is next so as to discharge the electric energy stored in battery B6 to battery B6 execution discharge operations
Supplement the power supply to each electrical equipment B3 in power unit B.
Specifically, that the electricity consumption surplus between above-mentioned distribution capacity and electric power is set into 80% is (i.e. above-mentioned to use electric work
Rate be less than distribution capacity 80%), it can be ensured that charging current and prevent facing for electric power and distribution capacity pre-set threshold value
The service life for causing the frequent discharge and recharges of battery B6 and shortening battery is changed at boundary's point.
It is possible to further be delayed in the charging interval 1 hour when battery B6 is charged and started, to prevent in default valve
The critical point of value changes the service life for causing constantly frequently repeatedly to charge and shorten battery B6.
In the preferred embodiment of the present invention, it can also include in above-mentioned power unit B：
Switch module (not shown), connects parallel module B4, the break-make for controlling parallel module B4；
When combined DC electric power system uses the working method of centralized charging, switch module control parallel module B4 is opened
Open, in power supply unit A electricity shortages, battery B6 is to dc bus C supplementary powers, and each electricity consumption in each power unit B is set
Standby B3 obtains the electric energy needed for work by dc bus C respectively；And
When combined DC electric power system uses the working method of independent charging, switch module control parallel module B4 is closed
(or directly omitting this two module) is closed, in power supply unit A electricity shortages, each electrical equipment B3 difference in each power unit B
Electric energy needed for work is obtained by local battery B6.
In the present embodiment, above-mentioned battery B6 another effect is, is supplied to power unit B only when independent counting
Vertical power supply.
Specifically, two kinds of working methods when combined DC electric power system has a power supply unit A electricity shortages：If work
Mode is centralized charging, then switch module control parallel module B4 connections, and now battery B6 is used to dc bus supplementary power
Electric unit B obtains electric energy by dc bus C.
If working method is independent charging, switch module control parallel module B4 disconnections (or directly omit this two mould
Block), now power unit B is independently-powered by local battery B6.
In the preferred embodiment of the present invention, still as shown in figure 1, also including in above-mentioned each power unit B：
Distributed power source input interface B7, connects charge-discharge modules B1, and the distributed power generation power supply for providing outside connects
Enter power unit B and power.Above-mentioned distributed power source input interface B7 is easy to each power unit B to access distributed power generation electricity nearby
Source, can increase the supply in electric energy supplement source and reduce line transmission loss.
In the preferred embodiment of the present invention, still as shown in figure 1, above-mentioned modular converter B2 further comprises：
First modular converter B21, for the dc source in dc bus C to be converted into electrical equipment B3 normal works institute
The dc source of need simultaneously supplies electrical equipment B3, i.e., above-mentioned first modular converter B21 can be DC/DC modular converters.
Second modular converter B22, for the dc source in dc bus C to be converted into electrical equipment B3 normal works institute
The AC power of need simultaneously supplies electrical equipment B3, i.e., above-mentioned second modular converter B22 can be DC/AC modular converters.
In the present embodiment, the first modular converter B21 and the second modular converter can be included in a modular converter B2 simultaneously
B22, can also only include one among the first modular converter B21 and the second modular converter B22, specifically regarding modular converter B2
Depending on the working power type of the electrical equipment connected.
In the preferred embodiment of the present invention, still as shown in figure 1, above-mentioned control unit E also passes through a telecommunication list
Remote monitoring unit G externally connected first F, for providing remote monitoring service to remote monitoring unit G.
Specifically, in the present embodiment, the pre- place of electricity consumption status information can be carried out in advance inside above-mentioned control unit E
Reason, is handled such as carrying out data screening and data statistics, then by treated data display in above-mentioned control unit E
On remote monitoring unit G display screen.Then it is eventually displayed in the use on control unit E and remote monitoring unit G display screen
Electricity condition information can be presented by the way of data form, it would however also be possible to employ other person's observations easy to use and the mode understood
Present.
In the present embodiment, above-mentioned telecommunication unit F can be wire communication unit or wireless communication unit, can also
The communication unit realized for mobile network communication unit or using other suitable telecommunication modes.
In the preferred embodiment of the present invention, still as shown in figure 1, supply input outside above-mentioned power supply unit A connections
Source, with to the electric energy needed for power unit offer work；
Above-mentioned supply input source can include one or more hereinafter：
Civil power input source；
Photovoltaic electric energy input source；
Wind-powered electricity generation input source；
Batteries to store energy input source；And
Other suitable electric energy input sources.
In technical solution of the present invention, the concentration direct current supply pattern by using High Power Factor, high conversion efficiency is effective
Solve current electrical equipment or electric switch power supply power factor and efficiency be relatively low and distribution capacity balance and loss etc.
Problem, effectively reduces distribution investment, improves the benefit of energy-conserving and environment-protective.
In technical solution of the present invention, employing two-stage distributed generating, (external power source is powered and distributed with energy storage pattern
Generate electricity with the pattern of energy storage and internal distributed power generation with batteries to store energy individually or supplementary power pattern) power supply pacify
Row, improves the stability of power supply, and has reached the effect of " peak load shifting " conscientiously, reduces distribution capacity and loss, thus
Investment and the energy consumption of power supply unit can be solved.
It is the one group of power consumption power realized using the combined DC electric power system in technical solution of the present invention in Fig. 2
Change schematic diagram.It is 200.5KW during the top of a certain block supply in Fig. 2, is 49.6KW during lowest trough.If according to tradition
Regular distribution scheme, should at least configure 250KVA distribution capacity (distribution capacity be theoretical calculation capacity, if consider work(
The factors such as rate factor, line loss ..., its distribution capacity at least should be in more than 400KVA).
According to the combined DC electric power system in technical solution of the present invention, more than the part for the distribution capacity for adding setting
Amount, it is only needed within configuration 150KVA.Because the electricity consumption time more than 120KW is no more than 6 hours, therefore battery B6
Discharge time be no more than 6 hours, and the charging interval be 12 hours.
In technical solution of the present invention, due to saving the inversion link of distributed power source, can effectively it reduce because of inversion effect
It is lost caused by the efficiency and power factor of rate and electrical equipment or the Switching Power Supply of electrical equipment.
Also, because the power supply capacity of direct current supply is better than 2-3 times of Alternating Current Power Supply, direct current supply has high stable simultaneously
Property, it is noiseless, without frequency stabilization and the exchange factor such as capacity current reactance compensation, and it has intelligence relative to Alternating Current Power Supply
Energyization monitoring in real time and regulation and control it is more convenient and accurately, response faster, shorter recovery time, independent protective and reliable and stable etc. excellent
Gesture, can reduce the fault rate of electrical equipment, reduce the cost of recruitment and maintenance and repair.
Preferred embodiments of the present invention are the foregoing is only, embodiments of the present invention and protection model is not thereby limited
Enclose, to those skilled in the art, should can appreciate that made by all utilization description of the invention and diagramatic content
Scheme obtained by equivalent substitution and obvious change, should be included in protection scope of the present invention.
Claims (8)
1. a kind of combined DC electric power system, it is characterised in that described including a power supply unit and multiple power units
Power supply unit is connected with each power unit respectively by a dc bus, between each power unit each other simultaneously
Connection；
Include respectively in each power unit：
Charge-discharge modules, connect the dc bus, for obtaining electric energy from the dc bus；
Modular converter, connects the charge-discharge modules, and connects each electrical equipment in the power unit respectively, for by institute
State charge-discharge modules to be changed in the electric energy that the dc bus is obtained, to supply used in each electrical equipment work
Electric energy；
Parallel module, connects the charge-discharge modules, and the power unit is accessed in parallel by the parallel module
In the dc bus of the combined DC electric power system；
Monitoring module, connects the charge-discharge modules and the parallel module, and be connected to institute by a communication bus respectively
Power supply unit is stated, for gathering the electricity consumption status information in the power unit and exporting；
Also include a control unit in the combined DC electric power system, the communication bus is connected to, for by described
Communication bus obtains the electricity consumption status information that the monitoring module in each power unit is gathered and exported, with right
Each power unit is monitored；
Described control unit will also be transferred to each institute for controlling the control signal of the power unit by the monitoring module
Power unit is stated, to control each power unit to work.
2. combined DC electric power system as claimed in claim 1, it is characterised in that also wrapped in each power unit
Include：
Battery, is accessed described in the combined DC electric power system by the charge-discharge modules and the parallel module
In dc bus；
When the electric power of the power unit is less than the distribution capacity of said supply unit, and the electric power matches somebody with somebody with described
When difference between capacitance is not less than a predetermined threshold value, the dc bus provides the electricity consumption by the charge-discharge modules
Needed for unit normal work while electric energy, the charge-discharge modules perform charging operations to the battery；And
When the electric power is not less than the distribution capacity, the battery performs electric discharge behaviour by the charge-discharge modules
Make, to carry out supplementary power to the power unit.
3. combined DC electric power system as claimed in claim 2, it is characterised in that the predetermined threshold value matches somebody with somebody electric capacity to be described
The 20% of amount.
4. combined DC electric power system as claimed in claim 1, it is characterised in that also wrapped in each power unit
Include：
Distributed power source input interface, connects the charge-discharge modules, and the distributed power source access for providing outside is described to be used
Electric unit is simultaneously powered.
5. combined DC electric power system as claimed in claim 1, it is characterised in that the modular converter includes：
First modular converter, for the dc source in the dc bus to be converted into needed for the electrical equipment normal work
Dc source and supply the electrical equipment；And/or
Second modular converter, for the dc source in the dc bus to be converted into needed for the electrical equipment normal work
AC power and supply the electrical equipment.
6. combined DC electric power system as claimed in claim 1, it is characterised in that described control unit is also long-range by one
The externally connected remote monitoring unit of communication unit, for providing remote monitoring service to the remote monitoring unit.
7. combined DC electric power system as claimed in claim 1, it is characterised in that the confession outside said supply unit connection
Electric input source, with to the electric energy needed for the power unit offer work；
The supply input source includes：
Civil power input source；And/or
Photovoltaic electric energy input source；And/or
Wind-powered electricity generation input source；And/or
Batteries to store energy input source.
8. centralization DC power-supply system as claimed in claim 2, it is characterised in that also wrapped in each power unit
Include：
Switch module, connects the parallel module, the break-make for controlling the parallel module；
When the combined DC electric power system uses the working method of centralized charging, the switch module controls the parallel connection
Module is opened, and each electrical equipment in each power unit passes through the institute needed for the dc bus acquisition work respectively
State electric energy；And
When the combined DC electric power system uses the working method of independent charging, the switch module controls the parallel connection
Module is closed, and each electrical equipment in each power unit is respectively by described in needed for the battery acquisition work
Electric energy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710339468.7A CN106981917A (en) | 2017-05-15 | 2017-05-15 | A kind of combined DC electric power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710339468.7A CN106981917A (en) | 2017-05-15 | 2017-05-15 | A kind of combined DC electric power system |
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| CN201710339468.7A Pending CN106981917A (en) | 2017-05-15 | 2017-05-15 | A kind of combined DC electric power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110901471A (en) * | 2019-11-19 | 2020-03-24 | 广州东方电科自动化有限公司 | Rapidly-extensible electric automobile flexible direct-current charging system |
| CN112721713A (en) * | 2021-02-02 | 2021-04-30 | 四川光慧新能源科技有限公司 | Distributed charging pile control management system and arrangement method |
| CN116979684A (en) * | 2023-06-20 | 2023-10-31 | 中交一公局电气化工程有限公司 | Urban tunnel electric power monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110901471A (en) * | 2019-11-19 | 2020-03-24 | 广州东方电科自动化有限公司 | Rapidly-extensible electric automobile flexible direct-current charging system |
| CN112721713A (en) * | 2021-02-02 | 2021-04-30 | 四川光慧新能源科技有限公司 | Distributed charging pile control management system and arrangement method |
| CN116979684A (en) * | 2023-06-20 | 2023-10-31 | 中交一公局电气化工程有限公司 | Urban tunnel electric power monitoring system |
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