CN107968572B - A kind of DC solid transformer and its control method with fault ride-through capacity - Google Patents
A kind of DC solid transformer and its control method with fault ride-through capacity Download PDFInfo
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- CN107968572B CN107968572B CN201711276544.0A CN201711276544A CN107968572B CN 107968572 B CN107968572 B CN 107968572B CN 201711276544 A CN201711276544 A CN 201711276544A CN 107968572 B CN107968572 B CN 107968572B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/002—Intermediate AC, e.g. DC supply with intermediated AC distribution
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a kind of DC solid transformer and its control method with fault ride-through capacity.The DC solid transformer includes a filter inductance, a full-bridge submodule, N-1 half-bridge submodule and N number of DC-DC isolated converter.Bridge-type submodule, which is connected after cascading mutually with filter inductance, accesses medium voltage DC net, the output end of each bridge-type submodule is connect with the direct-flow input end of each DC-DC isolated converter, is connect after the DC output end of all DC-DC isolated converters is in parallel with low-voltage direct power grid.When short trouble occurs for medium voltage DC net, if the medium voltage DC net voltage after failure is higher than preset threshold, DC solid transformer of the present invention realizes fault traversing by adjusting whole bridge-type submodule duty ratios；If DC voltage is less than or equal to preset threshold, DC solid transformer of the present invention is by shutting down half-bridge submodule and its connected DC-DC isolated converter, and only fault traversing is realized in full-bridge submodule and its DC-DC isolated converter connected work.
Description
Technical field
The invention belongs to the technical fields of applied power electronics, are related to DC grid short trouble and solid-state transformer, especially
It is related to a kind of DC solid transformer and its control method with fault ride-through capacity.
Background technique
The short trouble processing of DC grid is a problem.In DC grid, since nature is not present in short circuit current
Zero crossing, dc circuit breaker needs cut-off very big fault current in several milliseconds, this is one very big to dc circuit breaker
Challenge, the case history still applied at present without dc circuit breaker.Therefore, pertinent literature proposes a kind of no dc circuit breaker
DC Line Fault remove strategy, by combine converters current handling capability and high current but structure cannot be cut-off
Simply, cheap, Technical comparing is mature DC switchgear (such as D.C. contactor, direct current sectionaliser) realize failure every
From, key is that the converters for controlling power output remain to maintain output current control after exporting terminal shortcircuit,
Possess fault ride-through capacity, this removes strategy for DC Line Fault and provides a kind of completely new thinking.
Basic equipment of traditional power transformer as electric system, cannot achieve DC voltage conversion.In recent years, with
The fast development of power electronic technique, DC solid transformer had received widespread attention as a kind of novel transformer.?
In DC grid, DC solid transformer not only carries the task of transformation, provides for the load or new energy of low-voltage-grade
Port also takes on the function of DC power flow control, is the key that one of following DC grid distribution net equipment, DC solid transformation
It is the key that realize that direct current distribution is protected without dc circuit breaker that whether device, which possesses fault ride-through capacity, it is therefore necessary to propose one kind
DC solid transformer and its control method with fault ride-through capacity.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of direct current with short trouble ride-through capability
Solid-state transformer and its control method, the New Topological and its control method can meet the technical need that short trouble passes through.
The technical solution adopted by the present invention is that:
A kind of DC solid transformer with fault ride-through capacity, including a filter inductance, N number of bridge-type submodule
(containing a full-bridge submodule, N-1 half-bridge submodule) and N number of DC-DC isolated converter, N number of bridge-type submodule
Direct-flow input end anode after cascade is connected and is connect after the filter inductance with the anode of medium voltage DC net, N number of bridge-type
Direct-flow input end cathode after sub-module cascade is connect with the cathode of medium voltage DC net, N number of DC-DC isolated converter
DC output side it is in parallel after form direct current output port, direct current output port is connect with low-voltage direct power grid, each DC-
The direct current input side of DC isolated converter forms direct-flow input end mouth, each direct-flow input end mouth respectively with a bridge-type submodule
DC output end connection.
The DC-DC isolated converter includes inverter, LC series resonance link, intermediate-frequency transformer, rectifier and
The DC side of one capacitor, the inverter is connect with the DC output end of bridge-type submodule, the exchange side series connection of the inverter
The primary side of the intermediate-frequency transformer is connected after the LC series resonance link, the exchange side of the rectifier connects the intermediate frequency and becomes
The DC side on the secondary side of depressor, first capacitor described in the DC side parallel of the rectifier, the rectifier connects low-voltage direct
Power grid；
The inverter and the rectifier include four full-controlled switch containing anti-paralleled diode, and four contain instead simultaneously
The full-controlled switch of union II pole pipe connects into full bridge structure；LC series resonance link includes resonant inductance and resonant capacitance, bunchiness
The connection of connection form.
The full-bridge submodule includes two half-bridge bridge arms and second capacitor, and the half-bridge bridge arm is contained by upper and lower two
The full-controlled switch of anti-paralleled diode is composed in series, the collector of the upper tube of described two half-bridge bridge arms with the second capacitor
Anode is connected, and the emitter of down tube is connect with the cathode of the second capacitor, and the midpoint of described two half-bridge bridge arms is as full-bridge
The direct-flow input end of module, DC output end of the positive and negative anodes of second capacitor as full-bridge submodule.
The half-bridge submodule includes a half-bridge bridge arm and a third capacitor, the current collection of the upper tube of the half-bridge bridge arm
Pole is connected with the anode of third capacitor, and the emitter of down tube is connect with the cathode of third capacitor, the midpoint of the half-bridge bridge arm with
Direct-flow input end of the emitter of bridge arm down tube as half-bridge submodule, the positive and negative anodes of the third capacitor are as half-bridge submodule
DC output end.
The control method of the DC solid transformer includes nominal situation control and fault traversing control.Nominal situation control
Under system, the work of full-bridge submodule passes through the operative duty cycles for adjusting whole bridge-type submodules in 1/0 mode, DC solid transformer
Realize the bi-directional power flow between DC grid, the full-controlled switch in DC-DC isolated converter is with constant 50% duty
Compare work.Under fault traversing control, if medium voltage DC net voltage is higher than preset threshold, the DC solid transformer work shape
Condition passes through the operative duty cycles realization fault traversing for adjusting whole bridge-type submodules with the working condition under nominal situation control；
If medium voltage DC net voltage is less than or equal to preset threshold, the work of full-bridge submodule is in 1/-1 mode, the work of half-bridge submodule
In 0 mode, the full-controlled switch in DC-DC isolated converter that full-bridge submodule is connected is with constant 50% duty ratio work
Make, the full-controlled switch locking in the DC-DC isolated converter that half-bridge submodule is connected, by adjusting full-bridge submodule
Operative duty cycles realize fault traversing.
Beneficial effects of the present invention are as follows:
The invention proposes a kind of DC solid transformer and its control method with fault ride-through capacity, direct current are solid
State transformer has the characteristics that small in size, is conducive to the area occupied for reducing DC solid transformer, control method is divided into just
Normal operating conditions and fault traversing control, wherein fault traversing control are taken not according to the difference of actual electric network Voltage Drop degree
With control strategy, full voltage may be implemented and fall fault traversing in range, facilitate the removing of DC grid short trouble.
Detailed description of the invention
Fig. 1 is the integrated circuit structural schematic diagram of DC solid transformer of the present invention.
Fig. 2 is the bridge-type sub-modular structure schematic diagram of DC solid transformer of the present invention.
Fig. 3 is the DC-DC isolated converter structural schematic diagram of DC solid transformer of the present invention.
Fig. 4 is DC solid transformer bridge-type submodule operating mode schematic diagram of the present invention.
Fig. 5 is that DC solid transformer of the present invention is in nominal situation control and medium voltage DC net voltage is higher than default threshold
The status diagram under fault traversing control when value.
Fig. 6 is the failure that DC solid transformer of the present invention is in that medium voltage DC net voltage is less than or equal to preset threshold
Pass through the status diagram under control.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
As shown in Figure 1, a kind of DC solid transformer, which is characterized in that including 100, full-bridges of a filter inductance
Submodule 200, N-1 half-bridge submodule 300 and N number of DC-DC isolated converter 400, full-bridge submodule 200 and N-1 partly
It is connect after direct-flow input end anode series filtering inductance 100 after the cascade of bridge submodule 300 with the anode of medium voltage DC net, entirely
Bridge submodule 200 and the cathode of direct-flow input end cathode and medium voltage DC net after the N-1 cascade of half-bridge submodule 300 connect
Connect, form direct current output port after the DC output side of N number of DC-DC isolated converter 400 is in parallel, direct current output port with it is low
DC grid connection is pressed, the direct current input side of each DC-DC isolated converter 400 forms direct-flow input end mouth, each direct current
Input port is connect with the DC output end of full-bridge submodule 200 or half-bridge submodule 300, N number of DC-DC isolated converter
400 correspond with N number of bridge-type submodule.
As shown in Fig. 2, in the present embodiment, full-bridge submodule 200 includes two half-bridge bridge arms and the second capacitor 210, two
A half-bridge bridge arm is respectively preceding half-bridge bridge arm 220 and rear half-bridge bridge arm 230, and half-bridge bridge arm contains anti-paralleled diode by upper and lower two
Insulated gate bipolar transistor be composed in series, the emitter of the collector of the upper tube of half-bridge bridge arm and down tube respectively with the second electricity
Hold 210 positive and negative anodes connection, direct-flow input end of the midpoint of two half-bridge bridge arms as full-bridge submodule 200, the second capacitor 210
DC output end of the positive and negative anodes as full-bridge submodule 200.Half-bridge submodule 300 includes a half-bridge bridge arm and the second capacitor
210, the collector of the upper tube of half-bridge bridge arm and the emitter of down tube are connect with the positive and negative anodes of the second capacitor 210 respectively, half-bridge bridge
The positive and negative anodes of the direct-flow input end of the midpoint of arm and the emitter of bridge arm down tube as half-bridge submodule 300, the second capacitor 210 are made
For the DC output end of half-bridge submodule 300.
As shown in figure 4, in the present embodiment, there are two types of different operating modes, respectively 1 mode and 0 for half-bridge submodule
Mode.1 mode refers to that bridge insulated gate bipolar transistor is open-minded, lower bridge insulated gate bipolar transistor shutdown, half-bridge submodule
Block output voltage can consider equal to the second capacitance voltage；0 mode refers to that bridge insulated gate bipolar transistor turns off, and down tube is opened
Logical, half-bridge submodule output voltage can consider equal to 0.There are three types of different operating modes, respectively 1 mould for full-bridge submodule
Formula, -1 mode and 0 mode.1 mode refers to that bridge insulated gate bipolar transistor is open-minded on preceding half-bridge bridge arm in full-bridge submodule, under
Bridge insulated gate bipolar transistor turns off, the shutdown of bridge insulated gate bipolar transistor, lower bridge insulated gate bipolar on rear half-bridge bridge arm
Transistor npn npn is open-minded, and full-bridge submodule output voltage can consider equal to the second capacitance voltage；- 1 mode refers to full-bridge submodule
In bridge insulated gate bipolar transistor shutdown on preceding half-bridge bridge arm, lower bridge insulated gate bipolar transistor is open-minded, rear half-bridge bridge arm
Upper bridge insulated gate bipolar transistor is open-minded, the shutdown of lower bridge insulated gate bipolar transistor, and full-bridge submodule output voltage can be with
Think the negative value equal to the second capacitance voltage；0 mode refers to that bridge insulated gate bipolar is brilliant on preceding half-bridge bridge arm in full-bridge submodule
The shutdown of body pipe perseverance, lower bridge insulated gate bipolar transistor perseverance is open-minded, bridge insulated gate bipolar transistor Heng Guan on rear half-bridge bridge arm
Disconnected, lower bridge insulated gate bipolar transistor perseverance is open-minded, and full-bridge submodule output voltage can consider equal to 0.
In the present embodiment, the fault traversing of preset threshold is higher than in nominal situation control and medium voltage DC net voltage
Under control, the operating mode of half-bridge submodule is switched between 1 mode and 0 mode with switching frequency, that is, is worked in 1/0 mode, entirely
The operating mode of bridge submodule is switched between 1 mode and 0 mode with switching frequency, that is, is worked in 1/0 mode；In medium voltage DC
Net voltage is less than or equal under the fault traversing control of preset threshold, and half-bridge submodule perseverance works in 0 mode, full-bridge submodule
Operating mode is switched between 1 mode and -1 mode with switching frequency, that is, is worked in 1/-1 mode.
As shown in figure 3, DC-DC isolated converter 400 includes inverter 410, LC series resonance link 420, intermediate frequency change
Depressor 430, rectifier 440 and first capacitor 470.The DC side and full-bridge submodule 200 or half-bridge submodule of inverter 410
300 DC output end connects, and intermediate-frequency transformer 430 is connected after the exchange side series LC series resonance link 420 of inverter 410
Primary side, rectifier 440 exchange side connection intermediate-frequency transformer 430 secondary side, the DC side parallel first capacitor of rectifier 440
470, the DC side of rectifier 440 connects low-voltage direct power grid.
In the present embodiment, inverter and rectifier include four insulated gate bipolar crystal containing anti-paralleled diode
Pipe, four insulated gate bipolar transistors containing anti-paralleled diode connect into full bridge structure.Full bridge structure is a kind of modularization
Structure, convenient for integrated, production and management.
In the present embodiment, LC resonance link includes resonant inductance 450 and resonant capacitance 460, is connected at cascade.LC
Resonance link and inverter, intermediate-frequency transformer and rectifier constitute series resonant converter, are conducive to improve working efficiency, reduce
DC-DC isolated converter volume.
In the present embodiment, the fault traversing of preset threshold is higher than in nominal situation control and medium voltage DC net voltage
Under control, whole DC-DC isolated converters are in operating status, i.e. inverter in DC-DC isolated converter and rectification
Switching frequency operation of the insulated gate bipolar transistor containing anti-paralleled diode to set in device；In medium voltage DC net electricity
It forces down under the fault traversing control of preset threshold, only the DC-DC isolated converter of direct-flow input end connection full-bridge submodule
In it is in operating status, in the inverter and rectifier in remaining DC-DC isolated converter containing the exhausted of anti-paralleled diode
Edge grid bipolar junction transistor is turned off.
As shown in figure 5, in the present embodiment, under nominal situation control, the work of half-bridge bridge arm is in PWM before full-bridge submodule
The lower bridge insulated gate bipolar transistor perseverance of state, rear half-bridge bridge arm is open-minded, upper bridge insulated gate bipolar transistor perseverance shutdown, this
The operating mode of Shi Quanqiao submodule is identical with the operating mode of half-bridge submodule, works in 1/0 mode, owns simultaneously
DC-DC isolated converter is in operating status, and the operative duty cycles by adjusting whole bridge-type submodules realize direct current
Bi-directional power flow between net.However, pressing DC bus hair in the middle if power presses DC bus from low-voltage direct bus flow direction
After raw short trouble, in order to cooperate DC grid to remove strategy without dc circuit breaker short trouble, DC solid transformer is necessary
Output current handling capability is kept after middle pressure exports terminal shortcircuit, if the middle pressure DC bus-bar voltage after failure is higher than default threshold
Value, then DC solid transformer station high-voltage side bus mode is consistent with nominal situation control, by adjusting accounting for for whole bridge-type submodules
Fault traversing can be realized in empty ratio.
As shown in fig. 6, in the present embodiment, if power presses DC bus from low-voltage direct bus flow direction, straightening in the middle
After flowing bus generation short trouble, if the middle pressure DC bus-bar voltage after failure is less than or equal to preset threshold, only by adusting
Whole bridge-type submodule operative duty cycles can not realize fault traversing under conditions of meeting DC Line Fault checkout time.In addition,
It, can not since the bridge-type submodule to work in 1/0 mode can not export negative voltage when pressure DC bus-bar voltage drops into 0 in the middle
Inductive current is flexibly controlled again.Therefore, in order to realize the fault traversing in total failure Voltage Drop depth, full-bridge
Module no longer works in 1/0 mode, but works in 1/-1 mode, exports negative voltage active control inductive current and reduces, simultaneously
Since middle pressure DC bus-bar voltage is smaller at this time, only full-bridge submodule autonomous working can meet resistance to pressure request, half-bridge submodule
Bridge insulated gate bipolar transistor perseverance is open-minded under block, upper bridge insulated gate bipolar transistor perseverance shutdown, i.e., permanent to work in 0 mode,
The DC-DC isolated converter that half-bridge submodule is connected no longer works.The DC-DC isolated form transformation that full-bridge submodule is connected
Device remains operational state, and DC solid transformer realizes fault traversing by adjusting the duty ratio of full-bridge submodule.
A specific embodiment of the invention is described in detail above, but specific during the present invention is not limited to the above embodiments
Details can carry out a variety of equivalents to technical solution of the present invention, these are equivalent within the scope of the technical concept of the present invention
Transformation all belongs to the scope of protection of the present invention.
Claims (3)
1. a kind of control method of the DC solid transformer with fault ride-through capacity, it is characterised in that:
The DC solid transformer includes a filter inductance, N number of DC-DC isolated converter and N number of bridge-type submodule
Block, N number of bridge-type submodule include a full-bridge submodule and N-1 half-bridge submodule, N number of bridge-type submodule
Direct-flow input end anode after cascade is connected and is connect after the filter inductance with the anode of medium voltage DC net, N number of bridge-type
Direct-flow input end cathode after sub-module cascade is connect with the cathode of medium voltage DC net, each DC-DC isolated converter
Direct current input side forms direct-flow input end mouth, and each direct-flow input end mouth respectively connects with the DC output end of a bridge-type submodule
Connect, form direct current output port after the DC output side of N number of DC-DC isolated converter is in parallel, direct current output port with
The connection of low-voltage direct power grid；
The control method of the DC solid transformer includes nominal situation control and fault traversing control: nominal situation control
Under, the work of full-bridge submodule in 1/0 mode, DC solid transformer by adjust the operative duty cycles of whole bridge-type submodules come
Realize the bi-directional power flow between DC grid, the full-controlled switch in DC-DC isolated converter is with constant 50% duty ratio
Work；Under fault traversing control, if medium voltage DC net voltage is higher than preset threshold, the DC solid transformer working condition
With the working condition under nominal situation control, the operative duty cycles by adjusting whole bridge-type submodules realize fault traversing；If
Medium voltage DC net voltage is less than or equal to preset threshold, and the work of full-bridge submodule works in 1/-1 mode, half-bridge submodule 0
Mode, the full-controlled switch in DC-DC isolated converter that full-bridge submodule is connected is with constant 50% duty cycle, partly
Full-controlled switch locking in the DC-DC isolated converter that bridge submodule is connected, by the work for adjusting full-bridge submodule
Duty ratio realizes fault traversing.
2. a kind of control method of DC solid transformer with fault ride-through capacity according to claim 1, special
Sign is:
The DC-DC isolated converter includes inverter, LC series resonance link, intermediate-frequency transformer, rectifier and the first electricity
Hold, the DC side of the inverter is connect with the DC output end of bridge-type submodule, described in the exchange side series connection of the inverter
The primary side of the intermediate-frequency transformer is connected after LC series resonance link, the exchange side of the rectifier connects the intermediate-frequency transformer
Secondary side, the DC side of first capacitor described in the DC side parallel of the rectifier, the rectifier connects low-voltage direct power grid；
The inverter and the rectifier include four full-controlled switch containing anti-paralleled diode, and four contain inverse parallel two
The full-controlled switch of pole pipe connects into full bridge structure；LC series resonance link includes resonant inductance and resonant capacitance, at series connection shape
Formula connection.
3. a kind of control method of DC solid transformer with fault ride-through capacity according to claim 1, special
Sign is:
The full-bridge submodule includes two half-bridge bridge arms and second capacitor, and the half-bridge bridge arm is contained instead simultaneously by upper and lower two
The full-controlled switch of union II pole pipe is composed in series, the collector of the upper tube of two half-bridge bridge arms with the second capacitor just
Extremely it is connected, the emitter of down tube is connect with the cathode of the second capacitor, and the midpoint of described two half-bridge bridge arms is as full-bridge submodule
The direct-flow input end of block, DC output end of the positive and negative anodes of second capacitor as full-bridge submodule；
The half-bridge submodule include a half-bridge bridge arm and a third capacitor, the collector of the upper tube of the half-bridge bridge arm with
The anode of third capacitor is connected, and the emitter of down tube is connect with the cathode of third capacitor, the midpoint of the half-bridge bridge arm and bridge arm
Direct-flow input end of the emitter of down tube as half-bridge submodule, the positive and negative anodes of the third capacitor are as the straight of half-bridge submodule
Flow output end.
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| CN108512432B (en) * | 2018-06-08 | 2024-02-27 | 特变电工新疆新能源股份有限公司 | Power electronic transformer with function of blocking bidirectional fault current |
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| CN110323930B (en) * | 2019-08-07 | 2024-02-02 | 国网山西省电力公司电力科学研究院 | Modularized multi-level direct current solid-state transformer and fault tolerance method |
| CN112816906B (en) * | 2020-12-28 | 2023-04-14 | 国电南瑞科技股份有限公司 | Distribution network direct-current transformer medium-voltage side bipolar short-circuit test platform and method |
| CN113300607A (en) * | 2021-05-26 | 2021-08-24 | 西安交通大学 | Double-active-bridge submodule based on full-bridge interface, direct-current transformer and control method of direct-current transformer |
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| CN104917415A (en) * | 2014-03-13 | 2015-09-16 | 国家电网公司 | DC fault ride-through control method for hybrid modular multilevel converter |
| CN104167912A (en) * | 2014-08-14 | 2014-11-26 | 华中科技大学 | MMC with zero direct voltage fault ride-through capability and design method thereof |
| CN104953873A (en) * | 2015-06-15 | 2015-09-30 | 中国科学院电工研究所 | Simulation model of hybrid-structure modular multi-level current converter |
| CN107332443A (en) * | 2017-08-14 | 2017-11-07 | 浙江大学 | A kind of DC solid transformer and its control method |
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| CN107968572A (en) | 2018-04-27 |
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