CN106093558A - Electric energy acquisition terminal ERTU scheme for the metering of flexible direct current power transmission system efficiency - Google Patents
Electric energy acquisition terminal ERTU scheme for the metering of flexible direct current power transmission system efficiency Download PDFInfo
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- CN106093558A CN106093558A CN201610377607.0A CN201610377607A CN106093558A CN 106093558 A CN106093558 A CN 106093558A CN 201610377607 A CN201610377607 A CN 201610377607A CN 106093558 A CN106093558 A CN 106093558A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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Abstract
The present invention relates to electric energy efficiency metering field, be particularly used for the electric energy acquisition terminal ERTU scheme of flexible direct current power transmission system efficiency metering, the energy data that on the one hand electric energy acquisition terminal gathers, storage ammeter exports with serial traffic form；The energy data collecting is transferred in the data acquisition for electric energy main website of dispatching terminal by still further aspect by uplink communication, and the data interaction finally by efficiency metering main website and the data acquisition for electric energy main website of dispatching terminal obtains corresponding data.Solve the system-level efficiency metering of flexible direct current power transmission system and the efficiency measurement problem of device level efficiency metering.Compensate for the blank both at home and abroad for the metering of flexible direct current power transmission system efficiency, provide technical support for improving the flexible direct current power transmission system change of current from now on transmission facility technological level, system operation mode.
Description
Technical field
The invention belongs to electric energy efficiency metering field, particularly to the electric energy measuring for flexible direct current power transmission system efficiency
Amount acquisition terminal ERTU scheme.
Background technology
Compared with conventional AC transmission of electricity and D.C. high voltage transmission, flexible DC power transmission has: can independently control meritorious
Power and reactive power, control is flexibly；Conveniently carry out trend reversion；Carry out the fast quick-recovery of faulty grids；Can phase between current conversion station
Independent control mutually, it is not necessary to communication；Under equivalent capability, current conversion station floor space is significantly less than conventional high-tension DC converter station；Hand over
The advantages such as the harmonic wave of DC side harmonics is all greatly reduced.Flexible DC power transmission can effectively solve offshore wind farm and distributed energy
The aspects such as grid-connected, island and remote districts power supply, urban distribution network increase-volume and multi-terminal HVDC transmission have great potential.
With the fast development of Novel power transmission system, not only bring the unprecedented development of electric utility, also give simultaneously
The equipment control of power system brings a lot of difficulty, power department be also required to solve how accurately and timely settlement system network loss,
The problems such as equipment loss.
Content of the invention
The purpose of the present invention is to propose to a kind of system-level efficiency metering being applicable to flexible direct current power transmission system and device level
The efficiency measuring terminal acquisition scheme of efficiency metering.
For achieving the above object, the technical solution used in the present invention is: for the metering of flexible direct current power transmission system efficiency
Electric energy acquisition terminal system, including data acquisition for electric energy main website, described system also includes that efficiency measures main website, electric energy gauge
Amount system, at least one electric energy acquisition terminal and at least one ammeter；Described data acquisition for electric energy main website measures with efficiency
Main website, electric energy metering system and electric energy acquisition terminal connect, and described electric energy acquisition terminal is connected with ammeter, is used for adopting
In collection, the energy data storing described ammeter, and the energy data transmission extremely described data acquisition for electric energy main website that will be gathered,
Obtain corresponding data by the data interaction of described efficiency metering main website and described data acquisition for electric energy main website again.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described electric flux
The energy data of the ammeter that acquisition terminal gathered, stores is that described ammeter exports with serial traffic form, and is led to by up
Letter transmission is to described data acquisition for electric energy main website.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described ammeter bag
Include electronic electricity meter and digitlization ammeter.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described electric flux
Acquisition terminal includes ERTU and digitlization ERTU.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described electric flux
Metering system includes conventional electric energy metering system and digitlization electric energy metering system, and described conventional electric energy metering system is adopted
With electromagnetic transformer, the voltage collecting, current-mode analog quantity are sent to described electronic electricity meter by cable, by described
Electronic electricity meter carries out processing calculating；Described digitalized electric energy consumption metering system uses electronic mutual inductor and combining unit
Become voltage, the collection of current data, output digit signals, be then sent to described numeral by IEC61850 standard communication protocol
Change ammeter, carry out processing calculating by described digitlization ammeter.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described conventional electricity
Energy meter passes through public telephone network or electric power program-controlled network or Internet, through Fax/Modern special line Modern network system
Connect described ERTU and described electronic electricity meter.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described digitlization
Electric energy metering system connects described electronic electricity meter by IEC61850 standard communication protocol respectively through described digitlization ERTU
With digitlization ammeter, described digitlization ammeter connects described combining unit.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described electronic type
Ammeter uses pulse output ammeter or RS485 interface ammeter.
For the electric energy acquisition terminal ERTU scheme of flexible direct current power transmission system efficiency metering, comprise the following steps:
(1) determining the collection capacity that flexible direct current power transmission system efficiency is measured, the metering of described efficiency includes system-level efficiency meter
Amount and the metering of device level efficiency, the collection capacity of described system-level efficiency metering is described flexible direct current power transmission system transmitting procedure
In, output active energy and the difference inputting active energy；The collection capacity of described device level efficiency metering is for gathering connection respectively
Transformer, converter valve, reactor, the electric flux at DC power transmission line two ends, active power, voltage, the data of electric current；Above-mentioned adopt
Collection amount directly obtains or is indirectly calculated the energy loss numerical value of described flexible direct current power transmission system and equipment；
(2) data item that flexible direct current power transmission system efficiency is measured is determined, the collection capacity determining according to step (1), described
The data item of efficiency metering includes direct current and the data item exchanging stoichiometric point；The data item of described exchange stoichiometric point includes three-phase electricity
Pressure, electric current, power factor, general power, forward and reverse electricity, ABC three-phase electricity and electricity markers；The number of described DC measurement point
Include voltage, electric current, power, forward and reverse electricity and electricity markers according to item；The acquisition protocols of above-mentioned data item and data form are
The data form that DL/T645 agreement specifies, uses secondary side numerical value；Sampling interval is for arranging 5-60 minute or giving tacit consent to 60 minutes；
(3), after determining the data item of the metering of efficiency described in step (2), use above-mentioned for flexible DC power transmission system
The electric energy acquisition terminal system of system efficiency metering carries out the collection of data and data is uploaded to described data acquisition for electric energy
Main website.
The above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, comprising: conventional electrical
Formula ammeter, digitlization ammeter or digitlization ammeter mix with conventional installing type ammeter, ERTU electric energy acquisition terminal, electric energy gauge
Amount system, efficiency measures main website.Described ERTU electric energy acquisition terminal is connected with ammeter, and it is for gathering the electricity consumption of described ammeter
Data are simultaneously uploaded to electric energy metering system；Described electric energy metering system is main with ERTU electric energy acquisition terminal, efficiency metering
Stand connection.
Flexible direct current power transmission system efficiency is that system exports active energy in flexible direct current power transmission system transmitting procedure
With the difference of active energy of input, simultaneously for further Study system internal unit efficiency, gather respectively connection transformer,
The data such as converter valve, reactor, the electric flux at DC power transmission line two ends, active power, voltage, electric current, thus direct or logical
Cross the energy loss numerical value being indirectly calculated flexible direct current power transmission system and relevant device.Determine the phase for efficiency metering
Close data item, including direct current with exchange stoichiometric point.Exchange stoichiometric point need data include three-phase voltage, electric current, power factor,
General power, forward and reverse electricity, ABC three-phase electricity and these electricity time marking information corresponding when freezing or gather, i.e.
Electricity markers；DC measurement point data includes voltage, electric current, power, forward and reverse electricity and corresponding time marking information, i.e.
Electricity markers.
After determining stoichiometric point and required data, the electric energy for the metering of flexible direct current power transmission system efficiency can be used
Amount acquisition terminal system, to realize the collection of data and data be uploaded to data acquisition for electric energy main website.Generated energy acquisition is eventually
The energy data that on the one hand end gathers, storage electric energy meter exports with serial traffic form；The electric energy that still further aspect will collect
Data are transferred in the data acquisition for electric energy main website of dispatching terminal by uplink communication, finally by efficiency metering main website and scheduling
The data interaction of data acquisition for electric energy main website of department obtains corresponding data.Electric energy metering system can configure conventional electric flux
Metering system and digitlization electric energy metering system.Conventional electric energy metering system mainly uses electromagnetic transformer to collect
Voltage, current-mode analog quantity by cable be sent to tradition ammeter in, by ammeter carry out process calculate；Digitalized electric energy gauge
Amount system uses electronic mutual inductor and combining unit to complete the collection of voltage, current data, output digit signals, then leads to
Cross IEC61850 standard communication protocol and send process and the calculating that digital electric meter carries out data to.
The invention has the beneficial effects as follows: propose the metering of system-level efficiency and the equipment being applicable to flexible direct current power transmission system
The efficiency measuring terminal acquisition scheme of level efficiency metering, compensate for the sky both at home and abroad for the metering of flexible direct current power transmission system efficiency
In vain, technical support is provided for improving the flexible direct current power transmission system change of current from now on transmission facility technological level, system operation mode.
Brief description
Fig. 1 is the typical both-end flexible direct current power transmission system topological structure schematic diagram of one embodiment of the invention；
Fig. 2 is the electronic electricity meter electric energy acquisition terminal system schematic of one embodiment of the invention；
Fig. 3 is the electronic electricity meter of one embodiment of the invention, digitlization ammeter electric energy acquisition terminal system schematic；
Wherein, 1.-tietransformer, 2.-startup resistance, 3.-brachium pontis reactor, 4.-converter valve, 5.-reactor, 6.-
Cable, 7.-efficiency measures main website, 8.-electric energy metering system, 9.-FAX/Modern special line Modern network, 10.-common electrical
Phone network or electric power program-controlled network or Internet,-ERTU,-pulse output ammeter or RS485 interface ammeter, 7.-energy
Imitate and measure main website, 8.-electric energy metering system,-digitlization ERTU,-electronic electricity meter,-digitlization ammeter,
-combining unit.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the present invention are described in detail.
Embodiment:
As shown in Figure 2 and Figure 3, the present embodiment is to be realized by following technical scheme, is used for flexible direct current power transmission system
The electric energy acquisition terminal system of efficiency metering, including data acquisition for electric energy main website, described system also includes that efficiency metering is main
Stand, electric energy metering system, at least one electric energy acquisition terminal and at least one ammeter；Described data acquisition for electric energy main website
Measuring main website, electric energy metering system and electric energy acquisition terminal with efficiency to be connected, described electric energy acquisition terminal is with ammeter even
Connect, be used for gathering, storing the energy data of described ammeter, and the energy data transmission being gathered is adopted to described electric energy data
In collection main website, then obtain respective counts by the data interaction of described efficiency metering main website and described data acquisition for electric energy main website
According to.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, described electric flux
The energy data of the ammeter that acquisition terminal gathered, stores is that described ammeter exports with serial traffic form, and is led to by up
Letter transmission is to described data acquisition for electric energy main website.Described ammeter includes electronic electricity meter and digitlization ammeter.Described electric flux
Acquisition terminal includes ERTU and digitlization ERTU.Described electric energy metering system includes conventional electric energy metering system and digitlization
Electric energy metering system, described conventional electric energy metering system uses electromagnetic transformer by the voltage collecting, current analog
Amount is sent to described electronic electricity meter by cable, carries out processing calculating by described electronic electricity meter；Described digitalized electric energy
Consumption metering system uses electronic mutual inductor and combining unit to complete the collection of voltage, current data, output digit signals, so
It is sent to described digitlization ammeter by IEC61850 standard communication protocol afterwards, carry out processing meter by described digitlization ammeter
Calculate.Described conventional electrical energy metering passes through public telephone network or electric power program-controlled network or Internet, through Fax/Modern special line
Modern network system connects described ERTU and described electronic electricity meter.Described digitalized electric energy consumption metering system passes through
IEC61850 standard communication protocol connects described electronic electricity meter and digitlization ammeter, described number respectively through described digitlization ERTU
Word ammeter connects described combining unit.Described electronic electricity meter uses pulse output ammeter or RS485 interface ammeter.
For the electric energy acquisition terminal ERTU scheme of flexible direct current power transmission system efficiency metering, comprise the following steps:
(1) determining the collection capacity that flexible direct current power transmission system efficiency is measured, the metering of described efficiency includes system-level efficiency meter
Amount and the metering of device level efficiency, the collection capacity of described system-level efficiency metering is described flexible direct current power transmission system transmitting procedure
In, output active energy and the difference inputting active energy；The collection capacity of described device level efficiency metering is for gathering connection respectively
Transformer, converter valve, reactor, the electric flux at DC power transmission line two ends, active power, voltage, the data of electric current；Above-mentioned adopt
Collection amount directly obtains or is indirectly calculated the energy loss numerical value of described flexible direct current power transmission system and equipment；
(2) data item that flexible direct current power transmission system efficiency is measured is determined, the collection capacity determining according to step (1), described
The data item of efficiency metering includes direct current and the data item exchanging stoichiometric point；The data item of described exchange stoichiometric point includes three-phase electricity
Pressure, electric current, power factor, general power, forward and reverse electricity, ABC three-phase electricity and electricity markers；The number of described DC measurement point
Include voltage, electric current, power, forward and reverse electricity and electricity markers according to item；The acquisition protocols of above-mentioned data item and data form are
The data form that DL/T645 agreement specifies, uses secondary side numerical value；Sampling interval is for arranging 5-60 minute or giving tacit consent to 60 minutes；
(3), after determining the data item of the metering of efficiency described in step (2), use above-mentioned for flexible DC power transmission system
The electric energy acquisition terminal system of system efficiency metering carries out the collection of data and data is uploaded to described data acquisition for electric energy
Main website.
The system-level efficiency of flexible direct current power transmission system is that system output has in flexible direct current power transmission system transmitting procedure
Work(electric energy and the difference of the active energy of input, simultaneously for further Study system internal unit level efficiency, gather connection respectively
The data such as knot transformer, converter valve, reactor, the electric flux at DC power transmission line two ends, active power, voltage, electric current, thus
Directly or by the energy loss numerical value being indirectly calculated flexible direct current power transmission system and relevant device.Determine and be used for efficiency
Metering contiguous items, including direct current with exchange stoichiometric point.Exchange stoichiometric point need data include three-phase voltage, electric current,
Power factor, general power, forward and reverse electricity, ABC three-phase electricity and these electricity time mark corresponding when freezing or gather
Knowledge information i.e. electricity markers；DC measurement point data includes voltage, electric current, power, forward and reverse electricity and mark of corresponding time
Knowledge information, i.e. electricity markers.In Fig. 1 the 1st, the 2nd, 4 stoichiometric points gather alternating current energy datum；7 stoichiometric points gather direct current energy
Data；Needing the data item for efficiency metering as follows, table 1 gathers data item for exchange stoichiometric point, and table 2 is adopted for DC measurement point
Collection data.
Table 1 exchanges stoichiometric point and gathers data item
Table 2 DC measurement point gathers data item
After determining stoichiometric point and required data, above-mentioned measuring for flexible direct current power transmission system efficiency can be used
Electric energy acquisition terminal system to realize the collection of data and data be uploaded to main website.On the one hand electric energy acquisition terminal is adopted
The energy data that collection, storage electric energy meter export with serial traffic form；The energy data collecting is passed through upper by still further aspect
Row communications is in the data acquisition for electric energy main website of dispatching terminal, finally by efficiency metering main website and traffic department's electric flux
The data interaction of data acquisition main website obtains corresponding data.
If using conventional electrical formula ammeter, for the electric energy acquisition terminal system of flexible direct current power transmission system efficiency metering
As shown in Figure 2；Ammeter is connected with ERTU, and ERTU is by public telephone network, electric power program-controlled network or Internet and Fax/
Modern private line network be connected and and electric energy metering system to carry out information mutual.If using digitlization ammeter or digitlization ammeter
The pattern mixing with electronic electricity meter, for electric energy acquisition terminal system such as Fig. 3 of flexible direct current power transmission system efficiency metering
Shown in；Digitlization ammeter is connected with digitlization ERTU, and digitlization ERTU is connected with electric energy metering system, measures main website from efficiency
Obtain and store related data.
In the above-mentioned electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, electric energy metered system
Conventional electric energy metered system and digitalized electric energy metering system can be configured.Conventional electric energy metered system mainly uses electromagnetic type mutual
The voltage collecting, current-mode analog quantity are sent in traditional electronic electricity meter by sensor by cable, at ammeter
Reason calculates；Digitalized electric energy metering system uses electronic mutual inductor and combining unit to complete the collection of voltage, current data,
Output digit signals, then sends, by IEC61850 standard communication protocol, process and the meter that digitlization ammeter carries out data to
Calculate.
The present embodiment is for the electric energy acquisition terminal ERTU scheme of flexible direct current power transmission system efficiency metering, it is proposed that suitable
The efficiency measuring terminal acquisition scheme measured for the metering of system-level efficiency and the device level efficiency of flexible direct current power transmission system, be
Improving the flexible direct current power transmission system change of current from now on provides technical support with transmission facility technological level, system operation mode.
It should be appreciated that the part that this specification does not elaborates belongs to prior art.
Although describing the detailed description of the invention of the present invention above in association with accompanying drawing, but those of ordinary skill in the art should
Understanding, these are merely illustrative of, and can make various deformation or modification to these embodiments, former without departing from the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (9)
1. the electric energy acquisition terminal system for the metering of flexible direct current power transmission system efficiency, including data acquisition for electric energy master
Stand, it is characterised in that: described system also includes that efficiency measures main website, electric energy metering system, at least one generated energy acquisition eventually
End and at least one ammeter；Described data acquisition for electric energy main website measures main website, electric energy metering system and electric flux with efficiency
Acquisition terminal connects, and described electric energy acquisition terminal is connected with ammeter, is used for gathering, storing the energy data of described ammeter, and
The energy data transmission that will be gathered in described data acquisition for electric energy main website, then by described efficiency measure main website with described
The data interaction of data acquisition for electric energy main website obtains corresponding data.
2. electric energy acquisition terminal system as claimed in claim 1, it is characterised in that: described electric energy acquisition terminal is adopted
The energy data of the ammeter collect, storing is that described ammeter exports with serial traffic form, and extremely described by uplink communication transmission
Data acquisition for electric energy main website.
3. electric energy acquisition terminal system as claimed in claim 2, it is characterised in that: described ammeter include electronic electricity meter and
Digitlization ammeter.
4. electric energy acquisition terminal system as claimed in claim 3, it is characterised in that: described electric energy acquisition terminal includes
ERTU and digitlization ERTU.
5. electric energy acquisition terminal system as claimed in claim 4, it is characterised in that: described electric energy metering system includes often
Rule electric energy metering system and digitlization electric energy metering system, described conventional electric energy metering system uses electromagnetic transformer
The voltage collecting, current-mode analog quantity are sent to described electronic electricity meter by cable, are carried out by described electronic electricity meter
Process and calculate；Described digitalized electric energy consumption metering system uses electronic mutual inductor and combining unit to complete voltage, electric current number
According to collection, output digit signals, then by IEC61850 standard communication protocol be sent to described digitlization ammeter, by institute
State digitlization ammeter to carry out processing calculating.
6. electric energy acquisition terminal system as claimed in claim 5, it is characterised in that: described conventional electrical energy metering is by public affairs
Common-battery phone network or electric power program-controlled network or Internet, through Fax/Modern special line Modern network system connect described ERTU with
Described electronic electricity meter.
7. electric energy acquisition terminal system as claimed in claim 5, it is characterised in that: described digitalized electric energy consumption metering system
Connect described electronic electricity meter and digitlization ammeter, institute by IEC61850 standard communication protocol through described digitlization ERTU respectively
State digitlization ammeter and connect described combining unit.
8. electric energy acquisition terminal system as claimed in claim 3, it is characterised in that: described electronic electricity meter uses pulse defeated
Go out ammeter or RS485 interface ammeter.
9. the electric energy acquisition terminal ERTU scheme for the metering of flexible direct current power transmission system efficiency, it is characterised in that described side
Case comprises the following steps:
(1) determine the collection capacity that flexible direct current power transmission system efficiency is measured, the metering of described efficiency include the metering of system-level efficiency and
Device level efficiency is measured, and the collection capacity of described system-level efficiency metering is in described flexible direct current power transmission system transmitting procedure, defeated
Go out the difference of active energy and input active energy；The collection capacity of described device level efficiency metering is for gathering connection transformation respectively
Device, converter valve, reactor, the electric flux at DC power transmission line two ends, active power, voltage, the data of electric current；Above-mentioned collection capacity
Directly obtain or be indirectly calculated the energy loss numerical value of described flexible direct current power transmission system and equipment；
(2) data item that flexible direct current power transmission system efficiency is measured is determined, the collection capacity determining according to step (1), described efficiency
The data item of metering includes direct current and the data item exchanging stoichiometric point；Described exchange stoichiometric point data item include three-phase voltage,
Electric current, power factor, general power, forward and reverse electricity, ABC three-phase electricity and electricity markers；The data of described DC measurement point
Item includes voltage, electric current, power, forward and reverse electricity and electricity markers；The acquisition protocols of above-mentioned data item and data form are DL/
The data form that T645 agreement specifies, uses secondary side numerical value；Sampling interval is for arranging 5-60 minute or giving tacit consent to 60 minutes；
(3), after determining the data item of the metering of efficiency described in step (2), any claim institute in claim 1 to 8 is used
The electric energy acquisition terminal system stated carries out the collection of data and data is uploaded to described data acquisition for electric energy main website.
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Cited By (6)
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| CN106970263A (en) * | 2017-05-16 | 2017-07-21 | 国网江苏省电力公司电力科学研究院 | The efficiency metering system and metering method of a kind of electric vehicle alternating-current charging pile |
| CN107085139A (en) * | 2017-05-16 | 2017-08-22 | 国网江苏省电力公司电力科学研究院 | The efficiency metering system and metering method of a kind of electric automobile direct-current charging post |
| CN108134379A (en) * | 2018-01-24 | 2018-06-08 | 国网江苏省电力有限公司苏州供电分公司 | A kind of distribution network system with failure active process |
| CN112730975A (en) * | 2020-12-28 | 2021-04-30 | 国网黑龙江省电力有限公司电力科学研究院 | Electric quantity metering system and network loss evaluation system realized by adopting same |
| CN112858779A (en) * | 2021-01-20 | 2021-05-28 | 国网浙江省电力有限公司营销服务中心 | Metering method and system for medium and low voltage direct current transmission system |
| CN114035099A (en) * | 2021-10-12 | 2022-02-11 | 深圳供电局有限公司 | Method and device for measuring AC/DC conversion efficiency and electronic equipment |
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| CN112858779A (en) * | 2021-01-20 | 2021-05-28 | 国网浙江省电力有限公司营销服务中心 | Metering method and system for medium and low voltage direct current transmission system |
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| CN114035099A (en) * | 2021-10-12 | 2022-02-11 | 深圳供电局有限公司 | Method and device for measuring AC/DC conversion efficiency and electronic equipment |
| CN114035099B (en) * | 2021-10-12 | 2023-12-22 | 深圳供电局有限公司 | Method and device for measuring alternating-current/direct-current conversion efficiency and electronic equipment |
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