CN105914772A - Hybrid DC power transmission system having DC fault blocking capacity and control method thereof - Google Patents
Hybrid DC power transmission system having DC fault blocking capacity and control method thereof Download PDFInfo
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- CN105914772A CN105914772A CN201610261731.0A CN201610261731A CN105914772A CN 105914772 A CN105914772 A CN 105914772A CN 201610261731 A CN201610261731 A CN 201610261731A CN 105914772 A CN105914772 A CN 105914772A
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- inverter
- level converter
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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
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a hybrid DC power transmission system. The power transmission system comprises a phase controlled rectifier which is arranged at a transmitting end and a self-resistance modularized multilevel converter which is arranged at a receiving end, or comprises the self-resistance modularized multilevel converter which is arranged at the transmitting end and the phase controlled rectifier which is arranged at the receiving end. The transmitting end and a first AC system are connected at the AC bus of the transmitting end, the receiving end and a second AC system are connected at the AC bus of the receiving end through an AC transformer, and the controlled rectifier and DC port of the self-resistance modularized multilevel converter are connected through a corresponding DC power transmission line. The invention also discloses a corresponding control method of the hybrid DC power transmission system. The problems that a phase controlled converter cannot connect a weak AC power grid and is liable to fail in phase commutation can be solved; or the phase controlled converter can directly connect a wind power plant with no requirement for installing of a reactive power compensation device so that the hybrid power transmission system is enabled to have a DC fault isolation function at the minimum cost.
Description
Technical field
The invention belongs to power system power transmission and distribution technical field, possess direct current more particularly, to one
The mixed type DC transmission system of fault blocking ability and control method thereof.
Background technology
High voltage dc transmission technology is broadly divided into the Traditional DC technology of transmission of electricity using phased inverter, adopts
Technology of HVDC based Voltage Source Converter and one end with voltage source converter use phased inverter, the other end
Use the Hybrid HVDC system of voltage source converter.
Traditional DC technology of transmission of electricity is suitable for high pressure, conveying electric energy remote, high-power, when receiving end exchanges
When short-circuit ratio is relatively low, the inverter side of Traditional DC transmission of electricity is susceptible to commutation failure, and Traditional DC
Technology of transmission of electricity needs external communication system to provide commutation voltage to it so that Traditional DC technology of transmission of electricity without
Method directly applies to transmit the generation of electricity by new energy such as wind-power electricity generation, photovoltaic generation.Existing flexible direct current is defeated
Power technology typically uses the topology of semi-bridge type modularization multi-level converter, overcomes tradition well straight
The above-mentioned two defect that stream transmission of electricity exists, uses the flexible direct current of semi-bridge type modularization multi-level converter
The defect of transmission of electricity is that this Technology of HVDC based Voltage Source Converter does not possess DC Line Fault isolating power, and direct current occurs
It is generally required to cut-off the AC circuit breaker of inverter both sides thus isolated DC fault during fault, and cut-off
AC circuit breaker can cause system power supply to interrupt and significantly delay the time of system resumes power.Although
The DC side of semi-bridge type modularization multi-level converter installs dc circuit breaker can preferably solve direct current
Fault Isolation problem, but dc circuit breaker technology is the most immature at present, and reliability has to be hoisted, and directly
Stream chopper is with high costs so that Technology of HVDC based Voltage Source Converter still exists in terms of DC Line Fault isolation
Defect.
Hybrid HVDC system can overcome the problem that flexible transmission system exists, such as a kind of direct current
Transmission system, its rectification side uses phased inverter, uses semi-bridge type modular multilevel in inverter side
Inverter, and in the DC port installing high-voltage diode group of inverter side, this system possesses unidirectional trend
DC Line Fault isolation features.The most also propose to use based on full-bridge submodule in the side of direct current transportation
The mixed of phased inverter is used with the mixed type module multilevel converter of half-bridge submodule, opposite side
Close the scheme of HVDC Transmission Technology, so that this Hybrid HVDC system possesses two-way isolated DC
The ability of fault, and reduce the cost of Hybrid HVDC to a certain extent and can have concurrently phased
Inverter and the advantage of voltage source converter.
Fig. 2 show a kind of mixed type module multilevel converter topology 2 of the prior art with complete
Bridge type submodule topology 5, this topology possesses the ability blocking direct fault current.But, due to mixing
Type modularization multi-level converter needs to use more compared to semi-bridge type modularization multi-level converter
All-controlling power electronics device, mixed type module multilevel converter cost is still much higher than semi-bridge type
The cost of modularization multi-level converter, causes above-mentioned Hybrid HVDC technology to remain cost
High shortcoming, particularly, its speed restored electricity after isolated DC fault is the slowest, deposits
In obvious defect.
Occur in that in the industry a kind of novel Modularized multi-level converter sub-module topology at present, referred to as
From resistance type submodule (Self-blocking Sub-module), the such as earlier patent application of applicant
Disclosed in 201410233072.0 from resistance type submodule and be made up of it from resistance type modular multilevel
Disclosed in inverter, and 201610172192.3 a kind of from resistance type submodule and be made up of it from
Resistance type modularization multi-level converter.It is illustrated in figure 1 a kind of typical from resistance type modular multilevel
Inverter (from resistance type MMC) topology 1 and from resistance type submodule topology 4a, 4b.From resistance type MMC
The switching device quantity used is considerably less than mixed type MMC, is also less than from the cost of resistance type MMC
Mixed type MMC.
Summary of the invention
For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of mixed type direct current
Transmission system, it is by using from resistance type modularization multi-level converter as receiving end or sending end current conversion station,
It coordinates with phase controlled rectifier, can realize solving phased inverter and can not connect weak AC network, easily go out
The problem of existing commutation failure；Or can directly be connected with wind energy turbine set, it is not necessary to installing reactive power compensator,
Mixed type transmission system is made can just to possess DC Line Fault isolation features with minimum cost.
For achieving the above object, according to one aspect of the present invention, it is provided that a kind of mixed type direct current transportation
System, it is characterised in that this transmission system it include being positioned at phase controlled rectifier of sending end and be positioned at receiving end
From resistance type modularization multi-level converter, wherein,
Described phase controlled rectifier is connected at sending end ac bus by AC transformer and the first AC system
Connect, handed in receiving end by AC transformer and the second AC system from resistance type modularization multi-level converter
It is connected at stream bus, described phase controlled rectifier and the DC port from resistance type modularization multi-level converter
It is connected by corresponding DC power transmission line.
The technical scheme formed by above-mentioned design, it, when there is DC Line Fault, can pass through locking
From the driving signal of the all-controlling power electronics device of resistance type modularization multi-level converter and make sending end phase
Control rectifier is operated in inverter mode thus extinguishes the electric arc of DC Line Fault point so that Hybrid HVDC
System can quickly isolate DC Line Fault.
Preferably, described receiving end from resistance type modularization multi-level converter for by including the sub-change of current of positive pole
Two of device and the sub-inverter of negative pole from the sub-inverter unit of resistance type by connecting into bipolarity connection type
Form, wherein, the minus earth of the sub-inverter of described positive pole.
Preferably, the phase controlled rectifier of described sending end is for by including the sub-inverter of positive pole and the sub-change of current of negative pole
Two phase controlled rectifier unit of device form by connecting into bipolarity connection type, wherein, phased whole
The minus earth of the sub-inverter of positive pole of stream device.
Preferably, the sub-inverter of phase controlled rectifier positive pole negative pole and from the resistance type modular multilevel change of current
The negative pole of the sub-inverter of device positive pole can also pass through metallic return ground connection.
Preferably, described second AC system is two different AC networks, the resistance certainly of described receiving end
Type modularization multi-level converter is connectable to this two different AC networks, wherein from resistance type module
The positive pole inverter positive pole changing multilevel converter is connected with DC power transmission line positive pole, and positive pole changes
The AC of stream device is connected with one of them AC network by AC transformer, the sub-inverter of negative pole
Negative pole is connected with DC power transmission line negative pole, and negative pole inverter AC passes through AC transformer with another
One AC network is connected.
Preferably, the phase controlled rectifier in described mixed type DC transmission system and many from resistance type modularity
Level converter uses asymmetric positive polarity connection type, wherein phase controlled rectifier positive pole and from resistance type mould
Massing multilevel converter positive pole is connected by DC power transmission line, phase controlled rectifier and from resistance type module
Change the negative pole ground connection respectively of multilevel converter.
Preferably, described phase controlled rectifier positive pole and passing through from resistance type modularization multi-level converter positive pole
DC power transmission line is connected, and phase controlled rectifier and the negative pole from resistance type modularization multi-level converter pass through
Metallic return ground connection.
Preferably, the phase controlled rectifier in described mixed type DC transmission system and many from resistance type modularity
Level converter uses asymmetric positive polarity connection type, wherein phase controlled rectifier negative pole and from resistance type mould
Massing multilevel converter negative pole is connected by DC power transmission line, and the positive pole of two inverters connects respectively
Ground.
Preferably, phase controlled rectifier negative pole and pass through direct current from resistance type modularization multi-level converter negative pole
Transmission line of electricity is connected, and phase controlled rectifier and the positive pole from resistance type modularization multi-level converter pass through metal
Loop line is connected ground connection.
Preferably, described first AC system can be AC network, single wind energy turbine set, multiple wind-powered electricity generation
Group and single power station and multiple GROUP OF HYDROPOWER STATIONS.
Preferably, described first AC system can use with the public exchange bus of the second AC system
But it is not limited to the mode of connection of single busbar, double-bus, sectionalized single busbar connection.
Preferably, the full-control type power electronic that described receiving end uses from resistance type modularization multi-level converter
Device can be that insulated door pole bipolar transistor, integrated gate commutated thyristor or gate electrode capable of switching off are brilliant
Brake tube.
Preferably, the DC power transmission line of described mixed type DC transmission system can use direct current cables,
Overhead transmission line, overhead transmission line and the form such as cable run mixes.
It is another aspect of this invention to provide that provide the fault of a kind of above-mentioned mixed type DC transmission system every
From method, it is characterised in that after DC Line Fault being detected, how electric locking is therein from resistance type modularity
The driving signal of the all-controlling power electronics device of flat inverter, and it is inverse that phase controlled rectifier is operated in
Change state, thus extinguish direct-current arc.
Exist it is another aspect of this invention to provide that provide one for above-mentioned mixed type DC transmission system
Pre-charge method when restoring electricity, it is characterised in that described phase controlled rectifier detects DC Line Fault
After removing, put into constant DC current control and charge to DC power transmission line, described many from resistance type modularity
Level converter detects from the DC port voltage of resistance type modularization multi-level converter higher than a certain limit
The driving signal of its all-controlling power electronics device is unlocked again during value, thus fast recovery of power supply.
According to another aspect of the invention, it is provided that a kind of mixed type DC transmission system, its feature
Be, this mixed type DC transmission system include being positioned at sending end from resistance type modularization multi-level converter
Be positioned at the phased inverter of receiving end, wherein, described from resistance type modularization multi-level converter by handing over
Convertor transformer and the first AC system are connected at sending end ac bus, and described phased inverter is by handing over
Convertor transformer and the second AC system are connected at receiving end ac bus, described phased inverter and resistance certainly
The DC port of type modularization multi-level converter is connected by corresponding DC power transmission line.
The technical scheme formed by above-mentioned design, it, when there is DC Line Fault, can pass through locking
From the driving signal of the all-controlling power electronics device of resistance type modularization multi-level converter and make sending end phase
Control rectifier is operated in inverter mode thus extinguishes the electric arc of DC Line Fault point so that Hybrid HVDC
System can quickly isolate DC Line Fault.
Preferably, described receiving end from resistance type modularization multi-level converter for by including the sub-change of current of positive pole
Two of device and the sub-inverter of negative pole from the sub-inverter unit of resistance type by connecting into bipolarity connection type
Form, wherein, the minus earth of the sub-inverter of described positive pole.
Preferably, the phase controlled rectifier of described sending end is for by including the sub-inverter of positive pole and the sub-change of current of negative pole
Two phase controlled rectifier unit of device form by connecting into bipolarity connection type, wherein, phased whole
The minus earth of the sub-inverter of positive pole of stream device.
Preferably, the phased sub-inverter of inverter positive pole negative pole and from the resistance type modular multilevel change of current
The negative pole of the sub-inverter of device positive pole can also pass through metallic return ground connection.
Preferably, described second AC system is two different AC networks, the resistance certainly of described receiving end
Type modularization multi-level converter is connectable to this two different AC networks, wherein from resistance type module
The positive pole inverter positive pole changing multilevel converter is connected with DC power transmission line positive pole, and positive pole changes
The AC of stream device is connected with one of them AC network by AC transformer, the sub-inverter of negative pole
Negative pole is connected with DC power transmission line negative pole, and negative pole inverter AC passes through AC transformer with another
One AC network is connected.
Preferably, the phased inverter in described mixed type DC transmission system and many from resistance type modularity
Level converter uses asymmetric positive polarity connection type, the most phased inverter positive pole and from resistance type mould
Massing multilevel converter positive pole is connected by DC power transmission line, phased inverter and from resistance type module
Change the negative pole ground connection respectively of multilevel converter.
Preferably, described phased inverter positive pole and passing through from resistance type modularization multi-level converter positive pole
DC power transmission line is connected, and phased inverter and the negative pole from resistance type modularization multi-level converter pass through
Metallic return ground connection.
Preferably, the phased inverter in described mixed type DC transmission system and many from resistance type modularity
Level converter uses asymmetric positive polarity connection type, the most phased inverter negative pole and from resistance type mould
Massing multilevel converter negative pole is connected by DC power transmission line, and the positive pole of two inverters connects respectively
Ground.
Preferably, phased inverter negative pole and pass through direct current from resistance type modularization multi-level converter negative pole
Transmission line of electricity is connected, and phased inverter and the positive pole from resistance type modularization multi-level converter pass through metal
Loop line is connected ground connection.
Preferably, described sending end uses from resistance type modularization multi-level converter determines alternating voltage control,
The phased inverter of described receiving end uses constant DC voltage control.
Preferably, described first AC system can be AC network, single wind energy turbine set, multiple wind-powered electricity generation
Group and single power station and multiple GROUP OF HYDROPOWER STATIONS.
Preferably, described first AC system can use with the public exchange bus of the second AC system
But it is not limited to the mode of connection of single busbar, double-bus, sectionalized single busbar connection.
Preferably, the full-control type power electronic that described receiving end uses from resistance type modularization multi-level converter
Device can be that insulated door pole bipolar transistor, integrated gate commutated thyristor or gate electrode capable of switching off are brilliant
Brake tube.
Preferably, the DC power transmission line of described mixed type DC transmission system can use direct current cables,
Overhead transmission line, overhead transmission line and the form such as cable run mixes.
It is another aspect of this invention to provide that provide the Fault Isolation of above-mentioned mixed type DC transmission system
Method, it is characterised in that from resistance type modularization multi-level converter, sending end detects that DC Line Fault occurs
Time, the driving signal of its all-controlling power electronics device of locking, the phased inverter of receiving end detects direct current
The arc energy still remained on during fault generation thus extract in DC line.
It is another aspect of this invention to provide that provide a kind of for above-mentioned mixed type DC transmission system
The method of fast recovery of power supply after fault, it is characterised in that the phased inverter of receiving end detects direct current event
After barrier is removed, locking its trigger pulse or its DC current command value is set to zero, sending end is from resistance type
Modularization multi-level converter detect DC Line Fault remove after by certain control, progressively reduce bear
Put into from resistance type submodule number thus utilize sending end from the exchange of resistance type modularization multi-level converter
System is charged to DC power transmission line, when sending end is phased from resistance type modularization multi-level converter and receiving end
Inverter detects when respective DC port voltage is higher than certain value, puts into respective closed loop control,
Recovery system is powered.
A kind of for above-mentioned mixed type DC transmission system according to it is still another aspect of the present invention to provide
Quickly heavily throw the method from resistance type MMC, it is characterised in that after DC Line Fault is removed, progressively reduce
It is in the number from resistance type submodule of blocking thus without current-limiting resistance to DC line preliminary filling
Electricity, reaches to the purpose of circuit quick pre-charging electricity unloaded after DC Line Fault.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it is possible to
Obtain following beneficial effect:
(1) in the present invention, by employing possess block direct fault current ability from resistance type submodule
Topology, it, compared to bridge-type submodule and clamp dimorphism submodule, decreases son from resistance type submodule
Module number and switching loss, by this modularization multi-level converter constituted from resistance type submodule
(MMC) possesses blocking-up direct fault current function, it is adaptable to aerial line direct current transportation occasion.
(2) present invention is mixed compared to based on phased inverter and semi-bridge type modularization multi-level converter
Mould assembly DC transmission system, it possesses excellent DC Line Fault isolating power, have employed less simultaneously
All-controlling power electronics device, cost is lower.
(3) DC transmission system of the present invention and control method thereof, can extinguish electric arc rapidly, can
If to restore electricity more quickly and in recovery process, DC Line Fault yet suffers from, owing to restoring electricity
During control DC current thus ensure recover time not entail dangers to equipment run.
Accompanying drawing explanation
Fig. 1 is mixed type inverter topology, and wherein, every phase brachium pontis of mixed type inverter is by half
The semi-bridge type submodule composition of bridge-type submodule and half；
Fig. 2 is from resistance type modularization multi-level converter topology, wherein, from resistance type modular multilevel
Every phase brachium pontis of inverter is made up of the semi-bridge type submodule from resistance type submodule and half of half；
Fig. 3 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier uses the bipolarity mode of connection, and receiving end uses puppet from resistance type modularization multi-level converter
The bipolarity mode of connection；
Fig. 4 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use the bipolarity mode of connection from resistance type modularization multi-level converter, point
It is not in series by the sub-inverter of positive pole and the sub-inverter of negative pole, the sub-inverter of phase controlled rectifier positive pole
Negative pole and the negative pole from the resistance type sub-inverter of modularization multi-level converter positive pole ground connection respectively；
Fig. 5 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, receiving end
Being connected from the resistance type sub-inverter of modularization multi-level converter positive pole and the second AC system, negative pole changes
Stream device and the 3rd AC system are connected；
Fig. 6 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use the bipolarity mode of connection from resistance type modularization multi-level converter.Phase
The negative pole of the sub-inverter of control rectifier positive pole and from the resistance type sub-inverter of modularization multi-level converter positive pole
Negative pole by metallic return ground connection；
Fig. 7 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use the bipolarity mode of connection, phase from resistance type modularization multi-level converter
The negative pole of the sub-inverter of control rectifier positive pole and from the resistance type sub-inverter of modularization multi-level converter positive pole
Negative pole by metallic return ground connection, from the resistance type sub-inverter of modularization multi-level converter positive pole and the
Two AC systems are connected, and the sub-inverter of negative pole and the 3rd AC system are connected；
Fig. 8 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use asymmetric positive polarity wiring side from resistance type modularization multi-level converter
Formula, the negative pole of phase controlled rectifier and the ground connection respectively of the negative pole from resistance type modularization multi-level converter；
Fig. 9 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use asymmetric positive polarity wiring side from resistance type modularization multi-level converter
Formula, the negative pole of phase controlled rectifier and the negative pole from resistance type modularization multi-level converter pass through metallic return
Ground connection；
Figure 10 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use asymmetric negative polarity wiring side from resistance type modularization multi-level converter
Formula, the positive pole of phase controlled rectifier and the ground connection respectively of the positive pole from resistance type modularization multi-level converter；
Figure 11 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use asymmetric negative polarity wiring side from resistance type modularization multi-level converter
Formula, the positive pole of phase controlled rectifier and the positive pole from resistance type modularization multi-level converter pass through metallic return
Ground connection；
Figure 12 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Power supply is wind energy turbine set (14), sending end phase controlled rectifier by AC transformer (12) and wind energy turbine set (14),
Reactive power compensator (15) is connected at ac bus (7) place；
Figure 13 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Using the pseudo-bipolarity mode of connection from resistance type modularization multi-level converter, the phased inverter of receiving end uses
The bipolarity mode of connection；
Figure 14 is according to the mixed type DC transmission system of one embodiment of the present invention, and wherein, sending end is certainly
Resistance type modularization multi-level converter and the phased inverter of receiving end all use the bipolarity mode of connection, respectively
It is in series, from resistance type modularization multi-level converter just by the sub-inverter of positive pole and the sub-inverter of negative pole
The negative pole of the most sub-inverter and the negative pole of the phased sub-inverter of inverter positive pole ground connection respectively；
Figure 15 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
All use the bipolarity mode of connection from resistance type modularization multi-level converter and the phased inverter of receiving end, be subject to
Holding the phased sub-inverter of inverter positive pole and the second AC system to be connected, the sub-inverter of negative pole and the 3rd is handed over
Streaming system is connected.
Figure 16 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
The bipolarity mode of connection is all used from resistance type modularization multi-level converter and the phased inverter of receiving end, from
The negative pole of the sub-inverter of resistance type modularization multi-level converter positive pole and the phased sub-inverter of inverter positive pole
Negative pole by metallic return ground connection；
Figure 17 is the mixed type DC transmission system according to one embodiment of the present invention, and sending end is from resistance type
Modularization multi-level converter and the phased inverter of receiving end all use the bipolarity mode of connection, from resistance type mould
The negative pole of the sub-inverter of massing multilevel converter positive pole and the negative pole of the phased sub-inverter of inverter positive pole
By metallic return ground connection, the receiving end phased inverter inverter of positive pole and the second AC system are connected,
The sub-inverter of negative pole and the 3rd AC system are connected；
Figure 18 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Asymmetric positive polarity wiring side is all used from resistance type modularization multi-level converter and the phased inverter of receiving end
Formula, from negative pole and the negative pole ground connection respectively of phased inverter of resistance type modularization multi-level converter；
Figure 19 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use asymmetric positive polarity wiring side from resistance type modularization multi-level converter
Formula, passes through metallic return from the negative pole of resistance type modularization multi-level converter and the negative pole of phased inverter
Ground connection；
Figure 20 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Asymmetric negative polarity wiring side is all used from resistance type modularization multi-level converter and the phased inverter of receiving end
Formula, from positive pole and the positive pole ground connection respectively of phased inverter of resistance type modularization multi-level converter；
Figure 21 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Phase controlled rectifier and receiving end all use asymmetric negative polarity wiring side from resistance type modularization multi-level converter
Formula, passes through metallic return from the positive pole of resistance type modularization multi-level converter and the positive pole of phased inverter
Ground connection；
Figure 22 is the mixed type DC transmission system according to one embodiment of the present invention, wherein, sending end
Power supply is wind energy turbine set (14), sending end phase controlled rectifier by AC transformer (12) and wind energy turbine set (14),
Reactive power compensator (15) is connected at ac bus (7) place；
Figure 23 is the brachium pontis electricity from resistance type modularization multi-level converter fast recovery of power supply after a failure
Stream controller control block diagram.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And embodiment, the present invention is further elaborated.Should be appreciated that described herein specifically
Embodiment only in order to explain the present invention, is not intended to limit the present invention.Additionally, it is disclosed below
Just may be used as long as technical characteristic involved in each embodiment of the present invention does not constitutes conflict each other
To be mutually combined.
The mixed type DC transmission system that Fig. 3 provides for the embodiment of the present invention is used for from an AC system
To another AC system through-put power, it uses and achieves DC Line Fault isolation merit from resistance type MMC
Energy.
Wherein, phase controlled rectifier is made up of positive pole inverter 3P and negative pole inverter 3N.Phased
The positive pole of rectifier anode inverter 3P connects the positive pole of DC power transmission line 6, the sub-inverter of negative pole
The negative pole of 3N connects the negative pole of DC power transmission line 6, the negative pole of positive pole inverter 3P and negative pole
The positive pole of inverter 3N is directly grounded.
Phased inverter is connected with the first AC system 9 by AC transformer 12 at ac bus 7.
Using the symmetrical single stage mode of connection from resistance type modularization multi-level converter 1, it is become by exchange
Depressor 12 is connected at ac bus 7 with the second AC system 8.
When properly functioning, phased inverter is in rectification running status, is in inverse from resistance type inverter
Become running status.After detecting that DC Line Fault occurs, the phased urgent phase shift of inverter Trigger Angle, switching
To inverter operation；From the full control power electronic devices locking of resistance type MMC, from the electric capacity hindering submodule
Be in negative input state, so that trouble point electric arc extinguishes rapidly, it is achieved direct fault current every
From.For temporary DC Line Fault, in addition it is also necessary to transmission system possesses the ability that quickly restarts.Due to directly
Flow Line discharges the most completely when fault occurs, and is in Light Condition.
In order to avoid producing dash current during restarting, the safety of harm equipment, the present embodiment
In preferably employed the bridge arm current controller shown in Figure 13 from resistance type inverter, thus ensure the most extensive
During Fu there is not over-current phenomenon avoidance in bridge arm current, does not endanger the safe operation of equipment.
Fig. 4 is the topological structure of the mixed type DC transmission system of another embodiment, as shown in Figure 4,
The receiving end of the Hybrid HVDC system of this embodiment further by two from sub-inverter unit 1P of resistance type
Bipolarity connection type is constituted with 1N.From resistance type modularization multi-level converter positive pole inverter 1P
The positive pole of negative pole inverter with negative pole 1N be directly grounded.Being distinguished as of Fig. 4 and Fig. 3 works as direct current
After transmission line of electricity breaks down, topology shown in Fig. 4 can be by the non-faulting transmission line of electricity of another polarity
Continue to run with, ensure the power transmission of a part.
Fig. 5 is the topological structure of the mixed type DC transmission system of another embodiment, as it is shown in figure 5,
The receiving end inverter of the Hybrid HVDC system of this embodiment can connect two different exchanges further
Electrical network.Wherein, receiving end is from the resistance type sub-inverter of modularization multi-level converter positive pole and the second exchange system
System 8 is connected, and the sub-inverter of negative pole and the 3rd AC system 13 are connected.
Fig. 6 show the topological structure of the mixed type DC transmission system of another embodiment, such as Fig. 6 institute
Showing, the sending end inverter of the Hybrid HVDC system of this embodiment is neutral with receiving end Converter DC-side
Point can pass through metallic return 11 ground connection.Compared to topology shown in Fig. 4, DC current is big without flowing through
Ground, but constitute loop through metallic return 11 thus avoid DC current to metallic conduit along the line etc.
The corrosion of other civil equipment.
Fig. 7 show the topological structure of the mixed type DC transmission system of another embodiment, such as Fig. 7 institute
Show, can being connected further by the be connected Hybrid HVDC system of ground connection of metallic return of this embodiment
Connect two different AC networks.Wherein from the resistance type sub-inverter of modularization multi-level converter positive pole with
Second AC system 8 is connected, and the sub-inverter of negative pole and the 3rd AC system 13 are connected.
Fig. 8 show the topological structure of the mixed type DC transmission system of another embodiment, such as Fig. 8 institute
Showing, in the mixed type DC transmission system of this embodiment, sending end phase controlled rectifier and receiving end are from resistance type module
Change multilevel converter and all use the asymmetric positive polarity mode of connection.The negative pole of phase controlled rectifier 3 and from
The negative pole of resistance type modularization multi-level converter 1 ground connection respectively.This embodiment mixed type DC power transmission system
System is when properly functioning, and earthing pole can flow through larger current, can additional designs earthing pole.
Fig. 9 show the topological structure of the mixed type DC transmission system of another embodiment, such as Fig. 9 institute
Showing, in the mixed type DC transmission system of this embodiment, sending end phase controlled rectifier and receiving end are from resistance type module
Change multilevel converter and all use the asymmetric positive polarity mode of connection.The negative pole of phase controlled rectifier 3 and from
The negative pole of resistance type modularization multi-level converter 1 divides by metallic return 11 ground connection, can avoid Fig. 8
The DC current corrosion to other civil equipment such as metallic conduits near earthing pole in illustrated embodiment.
Figure 10 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 10
Shown in, in the mixed type DC transmission system of this embodiment, sending end phase controlled rectifier and receiving end are from resistance type mould
Massing multilevel converter all uses the asymmetric negative polarity mode of connection.The positive pole of phase controlled rectifier and from
The positive pole of resistance type modularization multi-level converter ground connection respectively.This embodiment when properly functioning, ground connection
Larger current can be flow through in pole, can additionally arrange earthing pole.
Figure 11 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 11
Shown in, in the mixed type DC transmission system of this embodiment, sending end phase controlled rectifier and receiving end are from resistance type mould
Massing multilevel converter all uses the asymmetric negative polarity mode of connection.The positive pole of phase controlled rectifier and from
The positive pole of resistance type modularization multi-level converter passes through metallic return 11 ground connection.By the way, may be used
Other civilian set to metallic conduit near earthing pole etc. to avoid in embodiment illustrated in fig. 10 DC current
Standby corrosion.
Figure 12 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 12
Shown in, the mixed type DC transmission system of this embodiment unlike the embodiment of Fig. 3, itself and wind
Electric field connects, may be used for wind energy transmission.Owing to phased inverter can not directly be connected with wind energy turbine set,
The present embodiment have employed STATCOM device 15 and maintain sending end ac bus 7 voltage.
Figure 13 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 13
Shown in, the sending end of the Hybrid HVDC system of this embodiment and receiving end are respectively by many from resistance type modularity
Level converter 1 and phased inverter 10 are constituted.Wherein, phased inverter is by positive pole inverter 10P
Inverter 10N with negative pole forms.The positive pole of phased inverter positive pole inverter 10P connects direct current
The positive pole of transmission line of electricity 6, the negative pole of negative pole inverter 10N connects the negative pole of DC power transmission line 6,
The positive pole of negative pole inverter with the negative pole 10N of positive pole inverter 10P is directly grounded.The phased change of current
Device 10P with 10N is connected with the second AC system 8 by AC transformer 12 at ac bus 7.
Using the symmetrical single stage mode of connection from resistance type modularization multi-level converter, it passes through AC transformer 12
It is connected at ac bus 7 with the first AC system 9.
Further, the topology of the present embodiment possesses DC Line Fault isolating power.After there is DC Line Fault,
From the full control power electronic devices locking of resistance type MMC, it is in negative input from the electric capacity of resistance type submodule
State, AC system 9 cannot provide short circuit current from resistance type inverter to trouble point by sending end.
And the phased inverter of receiving end is operated in inverter operation state, due to the unilateral conduction of thyristor device,
AC system 8 also cannot provide short circuit current by the phased inverter of receiving end to trouble point.Thus it is real
The isolation of existing direct fault current.
The scheme of the present embodiment is with the difference of the embodiment described in Fig. 3, the topology of the present embodiment
Can directly be connected with wind energy turbine set, it is not necessary to installing reactive power compensator.
Figure 14 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 14
Shown in, the sending end of the Hybrid HVDC system of this embodiment further by two from the sub-inverter of resistance type
Unit 1P and 1N constitutes bipolarity connection type.Change from resistance type modularization multi-level converter positive pole
The positive pole of negative pole inverter with the negative pole 1N of stream device 1P is directly grounded.
Figure 14 and embodiment illustrated in fig. 13 be distinguished as after DC power transmission line breaks down, Figure 14
Shown topology can be continued to run with by the non-faulting transmission line of electricity of another polarity, ensures the merit of a part
Rate is transmitted.
Figure 15 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 15
Shown in, the receiving end inverter of the Hybrid HVDC system of this embodiment can connect two not further
Same AC network.Wherein, the receiving end phased inverter inverter of positive pole and the second AC system 8 are connected,
The sub-inverter of negative pole and the 3rd AC system 13 are connected.
Figure 16 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 16
Shown in, in the sending end inverter of the Hybrid HVDC system of this embodiment and receiving end Converter DC-side
Property point can pass through metallic return 11 ground connection.Compared to topology shown in Figure 14, DC current is without stream
Through the earth, but constitute loop through metallic return 11 thus avoid DC current to metal tube along the line
The corrosion of other civil equipment such as road.
Figure 17 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 17
Shown in, this embodiment the most permissible by the be connected Hybrid HVDC system of ground connection of metallic return
Connect two different AC networks.Wherein from the resistance type sub-inverter of modularization multi-level converter positive pole
Being connected with the second AC system 8, the sub-inverter of negative pole and the 3rd AC system 13 are connected.
Figure 18 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 19
Shown in, in the mixed type DC transmission system of this embodiment, sending end is from resistance type modularization multi-level converter
Inverter phased with receiving end all uses the asymmetric positive polarity mode of connection.In this embodiment, phased inversion
The negative pole of device 10 and the ground connection respectively of the negative pole from resistance type modularization multi-level converter 1.This embodiment exists
Time properly functioning, earthing pole can flow through larger current, can additional designs earthing pole.
Figure 19 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 19
Shown in, in the mixed type DC transmission system of this embodiment, sending end is from resistance type modularization multi-level converter
Inverter phased with receiving end all uses the asymmetric positive polarity mode of connection.In this embodiment, phased inversion
The negative pole of device 10 and the negative pole from resistance type modularization multi-level converter 1 are divided and are connect by metallic return 11
Ground, can avoid in embodiment illustrated in fig. 18 DC current to other people such as metallic conduits near earthing pole
With the corrosion of equipment.
Figure 20 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 20
Shown in, in the mixed type DC transmission system of this embodiment, sending end is from resistance type modularization multi-level converter
Inverter phased with receiving end all uses the asymmetric negative polarity mode of connection.In this embodiment, phased inversion
The positive pole of device 10 and the ground connection respectively of the positive pole from resistance type modularization multi-level converter 1.This embodiment exists
Time properly functioning, earthing pole can flow through larger current, can additional designs earthing pole.
Figure 21 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 20
Shown in, in the mixed type DC transmission system of this embodiment, sending end is from resistance type modularization multi-level converter
Inverter phased with receiving end all uses the asymmetric negative polarity mode of connection.The positive pole of phased inverter 10 and
Divide by metallic return 11 ground connection from the positive pole of resistance type modularization multi-level converter 1, Figure 20 can be avoided
The DC current corrosion to other civil equipment such as metallic conduits near earthing pole in embodiment.
Figure 22 show the topological structure of the mixed type DC transmission system of another embodiment, such as Figure 22
Shown in, the mixed type DC transmission system of this embodiment from embodiment illustrated in fig. 3 unlike, itself and
Wind energy turbine set connects, may be used for wind energy transmission.Unlike embodiment illustrated in fig. 12, should be from resistance
Type modularization multi-level converter can directly be connected at ac bus 7 with wind energy turbine set 14.
Figure 23 show the bridge from resistance type modularization multi-level converter fast recovery of power supply after a failure
Arm electric current control block diagram.As shown in figure 23, after DC Line Fault is removed, by controlling at progressively reduction
In the number from resistance type submodule of blocking, such that it is able to do not put into current-limiting resistance to DC line
Precharge, reaches to the purpose of circuit quick pre-charging electricity unloaded after DC Line Fault.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention,
Not in order to limit the present invention, all made within the spirit and principles in the present invention any amendment, etc.
With replacement and improvement etc., should be included within the scope of the present invention.
Claims (28)
1. a mixed type DC transmission system, it is characterised in that this transmission system it include being positioned at and give
End phase controlled rectifier and be positioned at receiving end from resistance type modularization multi-level converter, wherein,
Described phase controlled rectifier is connected at sending end ac bus by AC transformer and the first AC system
Connect, handed in receiving end by AC transformer and the second AC system from resistance type modularization multi-level converter
It is connected at stream bus, described phase controlled rectifier and the DC port from resistance type modularization multi-level converter
It is connected by corresponding DC power transmission line.
Mixed type DC transmission system the most according to claim 1, wherein, the phase of described sending end
Control rectifier is formed by connecting into bipolarity connection type by the sub-inverter of positive pole and the sub-inverter of negative pole,
The minus earth of the sub-inverter of positive pole of described phase controlled rectifier.
Mixed type DC transmission system the most according to claim 1 and 2, wherein, described receiving end
From resistance type modularization multi-level converter by the sub-inverter of respectively positive pole and the two of the sub-inverter of negative pole
Individual forming by connecting into bipolarity connection type from the sub-inverter unit of resistance type, positive pole therein changes
The minus earth of stream device.
4. according to the mixed type DC transmission system described in Claims 2 or 3, wherein, phase control rectifier
The negative pole of the sub-inverter of positive pole of device and the sub-inverter of positive pole from resistance type modularization multi-level converter
Negative pole can pass through metallic return ground connection.
5. according to the mixed type DC transmission system described in claim 3 or 4, wherein, described second
AC system is two different AC networks, described receiving end from resistance type modularization multi-level converter
It is connectable to this two different AC networks, wherein from the positive pole of resistance type modularization multi-level converter
Sub-inverter positive pole is connected with DC power transmission line positive pole, from resistance type modularization multi-level converter just
The AC of the most sub-inverter is connected with one of them AC network, from resistance type mould by AC transformer
The negative pole of the sub-inverter of negative pole of massing multilevel converter is connected with DC power transmission line negative pole, from resistance
The negative pole inverter AC of type modularization multi-level converter is handed over another by AC transformer
Stream electrical network is connected.
Mixed type DC transmission system the most according to claim 1, wherein, described mixed type is straight
Flow the phase controlled rectifier in transmission system and use asymmetric positive pole from resistance type modularization multi-level converter
Property connection type, wherein phase controlled rectifier positive pole and passing through from resistance type modularization multi-level converter positive pole
DC power transmission line is connected, and phase controlled rectifier and the negative pole from resistance type modularization multi-level converter are respectively
Ground connection.
Mixed type DC transmission system the most according to claim 1, wherein, described mixed type is straight
Flow the phase controlled rectifier in transmission system and use asymmetric positive pole from resistance type modularization multi-level converter
Property connection type, wherein said phase controlled rectifier positive pole and from resistance type modularization multi-level converter positive pole
It is connected by DC power transmission line, phase controlled rectifier and the negative pole from resistance type modularization multi-level converter
By metallic return ground connection.
Mixed type DC transmission system the most according to claim 1, wherein, described mixed type is straight
Flow the phase controlled rectifier in transmission system and use asymmetric negative pole from resistance type modularization multi-level converter
Property connection type, wherein phase controlled rectifier negative pole and passing through from resistance type modularization multi-level converter negative pole
DC power transmission line is connected, and phase controlled rectifier and the positive pole from resistance type modularization multi-level converter are respectively
Ground connection.
Mixed type DC transmission system the most according to claim 1, wherein, described mixed type is straight
Flow the phase controlled rectifier in transmission system and use asymmetric negative pole from resistance type modularization multi-level converter
Property connection type, wherein phase controlled rectifier negative pole and passing through from resistance type modularization multi-level converter negative pole
DC power transmission line is connected, and phase controlled rectifier and the positive pole from resistance type modularization multi-level converter pass through
Metallic return is connected ground connection.
10. according to the mixed type DC transmission system according to any one of claim 1-9, wherein, institute
Stating the first AC system can be AC network, single wind energy turbine set, multiple wind farm group and single water
Power station and multiple GROUP OF HYDROPOWER STATIONS.
11. according to the mixed type DC transmission system according to any one of claim 1-10, wherein,
The public exchange bus of described first AC system and the second AC system can use but be not limited to list
Bus, double-bus, the mode of connection of sectionalized single busbar connection.
12. according to the mixed type DC transmission system according to any one of claim 1-11, wherein,
Described receiving end can be exhausted from the all-controlling power electronics device that resistance type modularization multi-level converter uses
Edge gate pole bipolar transistor, integrated gate commutated thyristor or gate level turn-off thyristor.
13. according to the mixed type DC transmission system according to any one of claim 1-12, wherein,
The DC power transmission line of described mixed type DC transmission system can use direct current cables, overhead transmission line,
Overhead transmission line or cable run mixed form.
The fault of the mixed type DC transmission system according to any one of 14. 1 kinds of claim 1-13 every
From method, it is characterised in that after DC Line Fault being detected, mixed type DC transmission system described in locking
In the driving signal of the all-controlling power electronics device from resistance type modularization multi-level converter, and make
Obtain phase controlled rectifier and be operated in inverter mode, thus extinguish DC Line Fault electric arc.
Mixed type DC transmission system according to any one of claim 1-13 is being recovered by 15. 1 kinds
Pre-charge method is carried out, it is characterised in that described phase controlled rectifier detects that DC Line Fault is clear during power supply
After removing, put into constant DC current control and charge to DC power transmission line, described mixed type DC power transmission system
In system from resistance type modularization multi-level converter detect from resistance type modularization multi-level converter straight
When flow port voltage is higher than a certain limit value, then unlock the driving signal of its all-controlling power electronics device,
Thus fast recovery of power supply.
16. 1 kinds of mixed type DC transmission systems, it is characterised in that this mixed type DC transmission system
Including be positioned at sending end from resistance type modularization multi-level converter and the phased inverter being positioned at receiving end, its
In, described sent by AC transformer and the first AC system from resistance type modularization multi-level converter
Being connected at end ac bus, described phased inverter is being subject to by AC transformer and the second AC system
It is connected at end ac bus, described phased inverter and the direct current from resistance type modularization multi-level converter
Port is connected by corresponding DC power transmission line.
17. mixed type DC transmission systems according to claim 16, wherein, described sending end
Phased inverter by the sub-inverter of positive pole and the sub-inverter of negative pole by connecting into bipolarity connection type and
Become, wherein, the minus earth of the sub-inverter of positive pole of phased inverter.
18. according to the mixed type DC transmission system described in claim 16 or 17, wherein, described
Being passed through even by the sub-inverter of positive pole and the sub-inverter of negative pole from resistance type modularization multi-level converter of receiving end
It is connected into bipolarity connection type to form, wherein, the described positive pole from resistance type modularization multi-level converter
The minus earth of sub-inverter.
19. according to the mixed type DC transmission system described in claim 17 or 18, wherein, phased
The negative pole of the sub-inverter of inverter positive pole and from the resistance type sub-inverter of modularization multi-level converter positive pole
Negative pole is also by metallic return ground connection.
20. according to the mixed type DC transmission system described in claim 18 or 19, wherein, described
Second AC system is two different AC networks, changing from resistance type modular multilevel of described receiving end
Stream device is connectable to this two different AC networks, wherein from resistance type modularization multi-level converter
Positive pole inverter positive pole is connected with DC power transmission line positive pole, and the AC of the sub-inverter of this positive pole leads to
Cross AC transformer to be connected with one of them AC network, bearing from resistance type modularization multi-level converter
The negative pole of the most sub-inverter is connected with DC power transmission line negative pole, and this negative pole inverter AC passes through
AC transformer is connected with another AC network.
21. mixed type DC transmission systems according to claim 16, wherein, described mixed type
Phased inverter in DC transmission system and from resistance type modularization multi-level converter use asymmetric just
Polarity connection type, the most phased inverter positive pole and from resistance type modularization multi-level converter positive pole lead to
Crossing DC power transmission line to be connected, phased inverter and the negative pole from resistance type modularization multi-level converter divide
Other ground connection.
22. mixed type DC transmission systems according to claim 16, wherein, described mixed type
Phased inverter in DC transmission system and from resistance type modularization multi-level converter use asymmetric just
Polarity connection type, the most phased inverter positive pole and from resistance type modularization multi-level converter positive pole lead to
Crossing DC power transmission line to be connected, phased inverter and the negative pole from resistance type modularization multi-level converter lead to
Cross metallic return ground connection.
23. mixed type DC transmission systems according to claim 16, wherein, described mixed type
Phased inverter in DC transmission system and use asymmetric negative from resistance type modularization multi-level converter
Polarity connection type, the most phased inverter negative pole and from resistance type modularization multi-level converter negative pole lead to
Cross DC power transmission line to be connected, phased inverter positive pole and from resistance type modularization multi-level converter positive pole
Ground connection respectively.
24. mixed type DC transmission systems according to claim 16, wherein, described mixed type
Phased inverter in DC transmission system and use asymmetric negative from resistance type modularization multi-level converter
Polarity connection type, the most phased inverter negative pole and from resistance type modularization multi-level converter negative pole lead to
Crossing DC power transmission line to be connected, phased inverter and the positive pole from resistance type modularization multi-level converter lead to
Cross metallic return to be connected ground connection.
25. according to the mixed type DC transmission system according to any one of claim 16-24, wherein,
Alternating voltage control, described receiving end phase are determined in using from resistance type modularization multi-level converter of described sending end
Control inverter uses constant DC voltage control.
The fault of the mixed type DC transmission system according to any one of 26. 1 kinds of claim 16-25 every
From method, it is characterised in that described mixed type DC transmission system sending end how electric from resistance type modularity
Flat inverter detects when DC Line Fault occurs, the driving signal of its all-controlling power electronics device of locking,
The phased inverter of receiving end detects and still remains on when DC Line Fault occurs thus extract in DC line
Arc energy.
27. 1 kinds to the mixed type DC transmission system according to any one of claim 16-25 in fault
The method of rear fast recovery of power supply, it is characterised in that the phase of described mixed type DC transmission system receiving end
After control inverter detects that DC Line Fault is removed, locking its trigger pulse or instructed by its DC current
Value is set to zero, and detecting from resistance type modularization multi-level converter of sending end is passed through after DC Line Fault is removed
Certain control, progressively reduce negative put into from resistance type submodule number thus utilize sending end from resistance type mould
The AC system of massing multilevel converter is charged to DC power transmission line, when sending end is from resistance type modularity
Multilevel converter and the phased inverter of receiving end detect that respective DC port voltage is higher than certain value
Time, putting into respective closed loop control, recovery system is powered.
28. 1 kinds of fast for mixed type DC transmission systems according to any one of claim 1-25
Speed heavily throws the method from resistance type modularization multi-level converter, it is characterised in that after DC Line Fault is removed,
Progressively reduce and be in the number from resistance type modularization multi-level converter of blocking thus without limit
Leakage resistance is pre-charged to DC line, reaches to the mesh of circuit quick pre-charging electricity unloaded after DC Line Fault
's.
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| CN110470947B (en) * | 2019-08-15 | 2021-08-31 | 天津大学 | Grounding electrode line fault distance measurement method suitable for MMC direct current system |
| CN110470947A (en) * | 2019-08-15 | 2019-11-19 | 天津大学 | A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system |
| WO2021135459A1 (en) * | 2020-01-03 | 2021-07-08 | 东南大学 | Series-parallel modular multi-level converter with cut-off capability and control method thereof |
| US11329549B2 (en) | 2020-01-03 | 2022-05-10 | Southeast University | Hybrid modular multilevel converter having fault blocking capability, and control method thereof |
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