CN106451518B - A kind of method and system of determining flexible direct current power grid DC fields electrical main connecting wire - Google Patents
A kind of method and system of determining flexible direct current power grid DC fields electrical main connecting wire Download PDFInfo
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention relates to a kind of method and system of determining flexible direct current power grid DC fields electrical main connecting wire, 1) it is the following steps are included: carry out fail-safe analysis to pre-set each converter station DC fields electrical main connecting wire alternative；2) according to the cost of relevant device each in main electrical scheme alternative level and quantity, to the carry out economic analysis of main electrical scheme alternative；3) according to the design feature of main electrical scheme alternative, power distribution equipment arrangement, relay protection and control mode, Dexterity analysis is carried out to main electrical scheme alternative；4) according to reliability, economy and the flexibility of each converter substation scheme's alternative, the scheme of each converter station DC fields electrical main connecting wire is determined；5) according to the scheme of each converter station DC fields electrical main connecting wire, the scheme of flexible direct current power grid DC fields electrical main connecting wire is obtained.The present invention can select optimal Main Wire Connection Scheme based on various factors, and adapt to Fast Construction and the development of the following flexible direct current power grid.
Description
Technical field
The present invention relates to a kind of in electrical network field determines the method and system of DC fields electrical main connecting wire, especially with regard to
A kind of method and system of determining flexible direct current power grid DC fields electrical main connecting wire.
Background technique
Flexible DC transmission, can be to wattful power generally using full control power electronic devices using voltage source converter
Rate and reactive power carry out independent quickly control.Based on wholly-controled device (IGBT) and the big essential characteristic of high frequency modulated technology two,
Flexible direct current also has reactive compensation and commutation failure problem, active and idle function on the basis of having the advantages that customary DC
Rate independent control, trend invert the technical advantages such as convenient and efficient, method of operation transformation is flexible.Currently, it is soft to have gone into operation both at home and abroad
Property DC engineering is substantially both ends chain type or the relatively simple topological structures such as multiterminal are emanant, not proper direct current
Power grid has the flexible direct current power grid of typical mesh topology structure, there is no engineering practice at present.
According to the difference of DC Line Fault reset mode, there are half-bridge converter valves to cooperate dc circuit breaker for flexible direct current power grid
(half-bridge scheme) and full-bridge converter valve cooperate Fast mechanical switch (full-bridge scheme) two schemes.Wherein, full-bridge scheme is in failure
It needs to be latched whole converter stations in reset procedure, the operation of AC and DC power grid is caused to impact；In contrast, half-bridge scheme exists
When removing DC Line Fault, it can not be latched or be only latched a few converter station, very little, Neng Gougeng are influenced caused by operation of power networks
The requirement of the following complicated DC grid operation control of good adaptation, is the developing direction of the following DC grid.Dc circuit breaker is
It is applied in the power system, but the problems such as there are voltage class and not high breaking capacity, is suitable for ± 500kV voltage class
Dc circuit breaker be still in the development stage.
DC fields are one of important components of converter station.The direct current for the flexible DC transmission engineering gone into operation both at home and abroad
Field electricity main wiring design is relatively easy, and does not carry out the correlative study of DC fields main electrical scheme moulder moisture substantially, usually adopts
With simple wiring or single bus scheme；Main cause is that return number less for equipment and outlet in DC fields, and due to not having high pressure
Dc circuit breaker, direct current system operation are relatively easy.With the development and building of global energy internet, flexible direct current power grid
Scale will it is increasingly huge, electric network composition is increasingly complicated, converter station goes out line number and number of elements and will be continuously improved, flexible direct current electricity
The method of operation of net and converter station is by more sophisticated.Therefore, it is necessary to flexible direct current power grid DC fields electrical main connecting wire type selecting
Carry out special design and research.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of determining flexible direct current power grid DC fields electrical main connecting wires
Method and system can select optimal Main Wire Connection Scheme based on various factors, and adapt to the following flexible direct current power grid
Fast Construction and development.
To achieve the above object, the present invention takes following technical scheme: a kind of determining flexible direct current power grid DC fields are electrical
The method of main electrical scheme, which is characterized in that 1) it according to pre-set each converter station DC fields the following steps are included: electrically lead
The parameter preset of main electrical scheme topological structure and relevant device in wiring alternative carries out reliability to main electrical scheme alternative
Analysis；2) according to the cost of relevant device each in main electrical scheme alternative level and quantity, the work of main electrical scheme alternative is calculated
Journey initial cost and annual cost obtain the economy of main electrical scheme alternative；3) according to the design feature of main electrical scheme alternative, match
Electric installation arrangement, relay protection and control mode carry out Dexterity analysis to main electrical scheme alternative；4) according to each converter station
Reliability, economy and the flexibility of DC fields electrical main connecting wire alternative determine that electrically master connects each converter station DC fields
The scheme of line；5) according to the scheme of each converter station DC fields electrical main connecting wire, flexible direct current power grid DC fields is obtained and are electrically led
The scheme of wiring.
Preferably, in the step 1), the alternative of each converter station DC fields electrical main connecting wire is according to each
Function and flexible direct current the Electric Power Network Planning setting of a converter station.
Preferably, the alternative of each converter station DC fields electrical main connecting wire includes single bus scheme, double-bus
Wiring, angle scheme and 3/2 wiring.
Preferably, in the step 1), carrying out fail-safe analysis to main electrical scheme alternative, specific step is as follows: according to
The structure of main electrical scheme alternative carries out trouble correlation analytic, obtains the common mode idle time of each equipment component；According to main electrical scheme
The dependability parameter of each relevant device in alternative obtains the fundamental analysis result of main electrical scheme alternative；It is standby to main electrical scheme
It selects in scheme previously selected equipment to carry out sensitivity analysis and it is alternative to be obtained according to the responsive parameter of selected equipment for main electrical scheme
The sensitivity analysis result of scheme；According to the fundamental analysis result of main electrical scheme alternative and sensitivity analysis as a result, being led
The reliability of wiring alternative.
Preferably, when the dependability parameter of each equipment includes failure rate, mean repair time, maintenance rate and maintenance
Between；The fundamental analysis result includes system blackout failure rate, System average interruption duration, availability, power failure probability, has a power failure and put down
Equal time, power failure frequency, loss electric energy and annual operating cost.
Preferably, in the step 3), the flexibility of main electrical scheme alternative is by operational flexibility, maintenance flexibility and expansion
Build flexibility composition.
Preferably, according to main electrical scheme alternative in management and running, investment and excision generator and load it is flexible
Degree, determines the operational flexibility of main electrical scheme alternative.
Preferably, safe inspection is carried out according to stoppage in transit breaker, bus and the relay protection device to main electrical scheme alternative
When repairing, the influence to operation of power networks and power supply is caused, determines the maintenance flexibility of main electrical scheme alternative.
Preferably, according to the workload of main electrical scheme alternative later period enlarging and to the influence of system power supply, master is determined
The enlarging flexibility of wiring alternative.
A kind of system of determining flexible direct current power grid DC fields electrical main connecting wire, which is characterized in that it include memory module,
Fail-safe analysis module, economy module, Dexterity analysis module and Main Wire Connection Scheme module；The memory module is for storing
The alternative of pre-set each converter station DC fields electrical main connecting wire；The fail-safe analysis module is used for according in advance
The default ginseng of main electrical scheme topological structure and relevant device in each converter station DC fields electrical main connecting wire alternative being arranged
Number carries out fail-safe analysis to the alternative of main electrical scheme, and the economy module is used for according to each in main electrical scheme alternative
The cost of equipment is horizontal and quantity obtains the economy of main electrical scheme alternative, and the Dexterity analysis module is used to be connect according to master
Design feature, power distribution equipment arrangement, relay protection and the control mode of line alternative carry out main electrical scheme alternative flexible
Property analysis；The Main Wire Connection Scheme module is used for reliability, economy and spirit according to each converter substation scheme's alternative
Activity determines the scheme of each converter station DC fields electrical main connecting wire, and according to each converter station DC fields electrical main connecting wire
Scheme obtains the scheme of flexible direct current power grid DC fields electrical main connecting wire.
The invention adopts the above technical scheme, which has the following advantages: 1, of the invention from main electrical scheme alternative
Reliability, economy and flexibility are evaluated, and are realized and are stood erectly the comprehensive assessment of flow field Main Bus Wiring Scheme to the change of current, and
The influence of the factors such as different main electrical scheme structures and all kinds of novel devices can be assessed, the quick of the following flexible direct current power grid is adapted to
Construction and development.2, the present invention is assessed from the flexibility of main electrical scheme alternative, so that the electricity main wiring design recommended
Scheme has better harmony and adaptability.3, the present invention is assessed from the economy of main electrical scheme alternative, Neng Gouman
Sufficient engineering go into operation year and distant view year operation, in terms of technical requirements.
Detailed description of the invention
Fig. 1 is the topological structure single line schematic diagram of the present embodiment Zhangbei County flexible direct current power grid；
Fig. 2 is that the present embodiment Zhangbei County stands erectly the electrical single female connection plan schematic diagram in flow field；
Fig. 3 is that the present embodiment Zhangbei County stands erectly the electrical double bus wiring scheme for double schematic diagram in flow field；
Fig. 4 is that the present embodiment Zhangbei County stands erectly flow field electrically angular line connection plan schematic diagram；
Fig. 5 is that the present embodiment Zhangbei County stands erectly the electrical 3/2 connection plan schematic diagram in flow field.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
The present invention provides a kind of determining flexible direct current power grid DC fields electrical main connecting wire method, the specific steps of which are as follows:
1) according to main electrical scheme topological structure in pre-set each converter station DC fields electrical main connecting wire alternative with
And the parameter preset of relevant device, fail-safe analysis is carried out to main electrical scheme alternative；
2) according to the cost of equipment each in main electrical scheme alternative level and quantity, the engineering of main electrical scheme alternative is calculated
Initial cost and annual cost obtain the economy of main electrical scheme alternative；
3) according to the design feature of main electrical scheme alternative, power distribution equipment arrangement, relay protection and control mode, master is connect
Line alternative carries out Dexterity analysis；
4) according to reliability, economy and the flexibility of each converter substation scheme's alternative, each converter station is determined
The scheme of DC fields electrical main connecting wire；
5) according to the scheme of each converter station DC fields electrical main connecting wire, obtaining flexible direct current power grid DC fields, electrically master is connect
The scheme of line.
Above-mentioned steps 1) in, the alternative of each converter station DC fields electrical main connecting wire is the function according to each converter station
It can be with the setting of flexible direct current Electric Power Network Planning.
Above-mentioned steps 1) in, to the fail-safe analysis of main electrical scheme alternative, specific step is as follows:
(1.1) according to the structure of main electrical scheme alternative, trouble correlation analytic is carried out, the common mode for obtaining each equipment component is stopped
Transport the time；
(1.2) according to the failure rate of equipment each in main electrical scheme alternative, mean repair time, maintenance rate, repair time
Equal dependability parameters, obtain system blackout failure rate, System average interruption duration, the availability, power failure of main electrical scheme alternative
The fundamental analysis results such as probability, the average time that has a power failure, power failure frequency, loss electric energy, annual operating cost；
(1.3) sensitivity analysis is carried out to equipment previously selected in main electrical scheme alternative, according to preselected equipment
Responsive parameter, obtain the sensitivity analysis result of main electrical scheme alternative；
(1.4) according to the fundamental analysis result of main electrical scheme alternative and sensitivity analysis as a result, to obtain main electrical scheme alternative
The reliability of scheme.
Above-mentioned steps 3) in, to the Dexterity analysis of main electrical scheme alternative, specific step is as follows:
(3.1) flexibility of main electrical scheme alternative is made of operational flexibility, maintenance flexibility and enlarging flexibility；
(3.2) according to main electrical scheme alternative in management and running, the flexibility ratio of investment and excision generator, load, really
Determine the operational flexibility of main electrical scheme alternative；
(3.3) safety inspection is carried out according to the stoppage in transit breaker, bus and relay protection device to main electrical scheme alternative
When, the influence to operation of power networks and power supply is caused, determines the maintenance flexibility of main electrical scheme alternative；
(3.4) according to the workload of main electrical scheme alternative later period enlarging and to the influence of system power supply, determine that master connects
The enlarging flexibility of line alternative；
(3.5) according to the operational flexibility of main electrical scheme alternative, maintenance flexibility and enlarging flexibility, main electrical scheme is obtained
The flexibility of alternative.
Based on the above method, the present invention also provides a kind of system of determining flexible direct current power grid DC fields electrical main connecting wire,
It includes memory module, fail-safe analysis module, economy module, Dexterity analysis module and Main Wire Connection Scheme module.
Memory module is used to store the alternative of pre-set each converter station DC fields electrical main connecting wire；
Fail-safe analysis module is used for according in pre-set each converter station DC fields electrical main connecting wire alternative
The parameter preset of main electrical scheme topological structure and relevant device carries out fail-safe analysis, economy to the alternative of main electrical scheme
Module is used to obtain the economy of main electrical scheme alternative according to the cost level and quantity of equipment each in main electrical scheme alternative,
Dexterity analysis module is used for the design feature according to main electrical scheme alternative, power distribution equipment arrangement, relay protection and controlling party
Formula carries out Dexterity analysis to main electrical scheme alternative.
Main Wire Connection Scheme module be used for according to the reliability of each converter substation scheme's alternative, economy and flexibly
Property, determine the scheme of each converter station DC fields electrical main connecting wire, and according to the side of each converter station DC fields electrical main connecting wire
Case obtains the scheme of flexible direct current power grid DC fields electrical main connecting wire.
Embodiment, by taking Zhangbei County station in Zhangbei County's flexible direct current power grid as an example, Zhangbei County stands erectly flow field Main Bus Wiring Scheme
Specific step is as follows for selection method:
1) as shown in Figure 1, Zhangbei County's flexible direct current power grid includes 4 converter stations altogether, respectively Zhangbei County station, Kangbao County station, Fengning
It stands and Beijing Station；Wherein, Zhangbei County station and Kangbao County station are that sending end new energy collects station, and Fengning station is energy storage regulation station, and Beijing Station is
By end station.Zhangbei County stands erectly streaming system using bipolar wiring construction, and rated capacity 3000MW, each pole outlet scale 2 is returned, until Kangbao County
It stands and each 1 time of Beijing Station；Zhangbei County's flexible direct current network voltage grade is ± 500kV, presets single bus scheme, double-bus connects
4 line, angle scheme and 3/2 wiring main electrical scheme alternatives, respectively as shown in Fig. 2~Fig. 5；
2) the common mode idle time of main electrical scheme alternative is as shown in table 1:
1 common mode idle time of table
| Device name | Common mode idle time (h) |
| DC bus | 5 |
| Disconnecting switch | 14 |
| Common-mode isolation switch | 0.4 |
| Common mode breaker | 0.5 |
The indexs such as failure rate, mean repair time, maintenance rate, repair time, the equipment manufacturing cost of main electrical scheme alternative, such as
Shown in table 2；
2 equipment dependability parameter of table
According to common mode idle time and equipment dependability parameter, obtains the power-off fault rate of main electrical scheme alternative, is averaged
Interruption duration, availability, power failure probability, the average time that has a power failure, power failure frequency, loss electric energy and operating cost etc. basis point
Analysis is as a result, as shown in table 3；Wherein, the electricity price in calculating is 0.5 yuan/kilowatt hour；
The fundamental analysis result of the electrical each main electrical scheme of 3 Zhangbei County's converter station of table
It is new research and development equipment in view of 500kV dc circuit breaker, there is no related operating statistic data, need to dc circuit breaker
Failure rate carry out sensitivity analysis, to dc circuit breaker failure rate improve 1 order of magnitude, such as failure rate by 0.0061 time/
It improves in platform year to 0.061 time/platform year；The sensitivity analysis of main electrical scheme alternative is obtained as a result, as shown in table 4；
The electrical each main electrical scheme sensitivity analysis result of 4 Zhangbei County's converter station of table
Main electrical scheme alternative is obtained according to the fundamental analysis result of main electrical scheme alternative and sensitivity analysis result
Reliability result: 3/2 wiring > angle scheme > double bus scheme > single bus scheme；Wherein, dc circuit breaker failure rate fluctuates not
It will affect the reliability ordering of main electrical scheme alternative.
3) initial cost cost calculation is carried out to main electrical scheme alternative, as shown in table 5, obtains single bus scheme, angular connects
Line initial cost level is minimum, 3/2 wiring initial cost highest；Wherein, since 500kV dc circuit breaker involves great expense, about 1.5 hundred million
Member/platform, the cost of investment of predominantly breaker when electrical main connecting wire initial cost calculates；
5 main electrical scheme initial cost cost of table
The calculated result of main electrical scheme alternative annual cost is as shown in table 6, single bus scheme and double bus scheme it is reliable
Property assessment result is relatively close to；The engineering initial cost of single bus scheme and angle scheme is essentially identical, therefore, connects for single busbar
Line and 3/2 wiring carry out annual cost and calculate and compare, wherein engineering economy service life presses 8% by 30 years, earning rate；
6 Zhangbei County's flexible direct current power grid annual cost of table
According to engineering initial cost cost and annual cost, the economy for obtaining single bus scheme scheme is more excellent.
4) flexibility evaluation is carried out to main electrical scheme alternative, as shown in table 7, according to operational flexibility, maintenance flexibility
With the comprehensive comparison of enlarging flexibility, obtain that double-bus, 3/2 connection plan flexibility are best, and single bus scheme scheme is taken second place, angle
Shape connection plan is relatively poor.
7 Zhangbei County's converter station electrical main connecting wire Dexterity analysis of table
5) it according to the reliability, economy and flexibility of main electrical scheme alternative, determines and Zhangbei County stands erectly electrically master connects in flow field
Line is single bus scheme scheme.
The various embodiments described above are merely to illustrate the present invention, and structure and size, setting position and the shape of each component are all can be with
It is varied, based on the technical solution of the present invention, the improvement and wait that all principles according to the present invention carry out individual part
With transformation, should not exclude except protection scope of the present invention.
Claims (10)
1. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire, which is characterized in that it the following steps are included:
1) it according to main electrical scheme topological structure in pre-set each converter station DC fields electrical main connecting wire alternative and sets
Standby parameter preset carries out fail-safe analysis to main electrical scheme alternative；
2) according to the cost of equipment each in main electrical scheme alternative level and quantity, the engineering for calculating main electrical scheme alternative is just thrown
Money and annual cost, obtain the economy of main electrical scheme alternative；
3) standby to main electrical scheme according to the design feature of main electrical scheme alternative, power distribution equipment arrangement, relay protection and control mode
Scheme is selected to carry out Dexterity analysis；
4) it according to reliability, economy and the flexibility of each converter station DC fields electrical main connecting wire alternative, determines each
The scheme of converter station DC fields electrical main connecting wire；
5) according to the scheme of each converter station DC fields electrical main connecting wire, flexible direct current power grid DC fields electrical main connecting wire is obtained
Scheme.
2. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as described in claim 1, it is characterised in that:
In the step 1), each converter station DC fields electrical main connecting wire alternative is according to the function of each converter station and soft
Property DC grid planning setting.
3. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as claimed in claim 2, it is characterised in that:
Each converter station DC fields electrical main connecting wire alternative includes single bus scheme, double bus scheme, angle scheme and 3/2
Wiring.
4. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as described in claim 1, it is characterised in that:
In the step 1), carrying out fail-safe analysis to main electrical scheme alternative, specific step is as follows:
Trouble correlation analytic is carried out according to the structure of main electrical scheme alternative, obtains the common mode idle time of each equipment component；
According to the dependability parameter of equipment each in main electrical scheme alternative, the fundamental analysis result of main electrical scheme alternative is obtained；
Sensitivity analysis is carried out to equipment previously selected in main electrical scheme alternative, according to the responsive parameter of selected equipment,
Obtain the sensitivity analysis result of main electrical scheme alternative；
According to the fundamental analysis result of main electrical scheme alternative and sensitivity analysis as a result, obtaining the reliable of main electrical scheme alternative
Property.
5. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as claimed in claim 4, it is characterised in that:
The dependability parameter of each equipment includes failure rate, mean repair time, maintenance rate and repair time；The fundamental analysis knot
Fruit include system blackout failure rate, System average interruption duration, availability, power failure probability, have a power failure average time, power failure frequency,
Lose electric energy and annual operating cost.
6. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as described in claim 1, it is characterised in that:
In the step 3), the flexibility of main electrical scheme alternative is made of operational flexibility, maintenance flexibility and enlarging flexibility.
7. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as claimed in claim 6, it is characterised in that:
According to main electrical scheme alternative in management and running, the flexibility ratio of investment and excision generator and load determines that main electrical scheme is standby
Select the operational flexibility of scheme.
8. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as claimed in claim 6, it is characterised in that:
When carrying out safety inspection according to stoppage in transit breaker, bus and the relay protection device to main electrical scheme alternative, cause to power grid
The influence of operation and power supply, determines the maintenance flexibility of main electrical scheme alternative.
9. a kind of method of determining flexible direct current power grid DC fields electrical main connecting wire as claimed in claim 6, it is characterised in that:
According to the workload of main electrical scheme alternative later period enlarging and to the influence of system power supply, the expansion of main electrical scheme alternative is determined
Build flexibility.
10. a kind of system of determining flexible direct current power grid DC fields electrical main connecting wire, it is characterised in that: it include memory module,
Fail-safe analysis module, economy module, Dexterity analysis module and Main Wire Connection Scheme module；The memory module is for storing
Pre-set each converter station DC fields electrical main connecting wire alternative；The fail-safe analysis module is used for basis and sets in advance
Main electrical scheme topological structure and the parameter preset of equipment in each converter station DC fields electrical main connecting wire alternative set, to master
Wiring alternative carries out fail-safe analysis, and the economy module is used for the cost according to equipment each in main electrical scheme alternative
Horizontal and quantity obtains the economy of main electrical scheme alternative, and the Dexterity analysis module is used for according to main electrical scheme alternative
Design feature, power distribution equipment arrangement, relay protection and control mode Dexterity analysis is carried out to main electrical scheme alternative；It is described
Main Wire Connection Scheme module is used for reliability, economy and flexibility according to each converter substation scheme's alternative, determines each
The scheme of a converter station DC fields electrical main connecting wire, and according to the scheme of each converter station DC fields electrical main connecting wire, it obtains soft
The scheme of property DC grid DC fields electrical main connecting wire.
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| CN113922671B (en) * | 2021-10-21 | 2023-07-21 | 国网经济技术研究院有限公司 | Three-port flexible direct-current transmission DC-DC converter and control method thereof |
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| CN103227468A (en) * | 2013-04-25 | 2013-07-31 | 国家电网公司 | Main wiring pairing and stringing optimization method for transformer station |
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