CN105914772B - The mixed type DC transmission system and control method for having DC Line Fault blocking ability - Google Patents
The mixed type DC transmission system and control method for having DC Line Fault blocking ability Download PDFInfo
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- CN105914772B CN105914772B CN201610261731.0A CN201610261731A CN105914772B CN 105914772 B CN105914772 B CN 105914772B CN 201610261731 A CN201610261731 A CN 201610261731A CN 105914772 B CN105914772 B CN 105914772B
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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
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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
- 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
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- 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
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- 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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Abstract
The invention discloses a kind of mixed type DC transmission systems, it includes positioned at the phase controlled rectifier of sending end and positioned at receiving end from resistance type modularization multi-level converter to the transmission system, or includes positioned at sending end from resistance type modularization multi-level converter and positioned at the phase controlled rectifier of receiving end.Wherein, sending end is connect at sending end ac bus with the first AC system, receiving end is connected at receiving end ac bus by AC transformer with the second AC system, and the phase controlled rectifier is connected with the DC port from resistance type modularization multi-level converter by corresponding DC power transmission line.The invention also discloses the control methods of corresponding mixed type DC transmission system.The present invention can solve phased inverter and cannot connect weak AC network, the problem of commutation failure easily occur；Or can directly be connected with wind power plant, installing reactive power compensator is not needed, mixed type transmission system is enabled just to have DC Line Fault isolation features with the smallest cost.
Description
Technical field
The invention belongs to electric system transmission & distribution electro-technical fields, have DC Line Fault more particularly, to one kind and block energy
The mixed type DC transmission system and its control method of power.
Background technique
High voltage dc transmission technology is broadly divided into the Traditional DC technology of transmission of electricity using phased inverter, using voltage-source type
The flexible DC transmission technology of inverter and one end use phased inverter, and the other end uses the mixing of voltage source converter
DC transmission system.
Traditional DC technology of transmission of electricity is suitble to high pressure, remote, high-power conveying electric energy, when receiving end ac short circuit is relatively low
When, the inverter side of Traditional DC transmission of electricity is easy to happen commutation failure, and Traditional DC technology of transmission of electricity needs external communication system
Commutation voltage is provided to it, so that Traditional DC technology of transmission of electricity not can be used directly in transmission wind-power electricity generation, photovoltaic power generation etc. newly
Energy power generation.Existing flexible DC transmission technology generally uses the topology of semi-bridge type modularization multi-level converter, well
The existing above-mentioned two defect of Traditional DC transmission of electricity is overcome, the flexible direct current using semi-bridge type modularization multi-level converter is defeated
The defect of electricity is that the flexible DC transmission technology does not have DC Line Fault isolating power, occurs to generally require out when DC Line Fault
The AC circuit breaker of disconnected inverter two sides cut-offs AC circuit breaker and will lead to system power supply interruption simultaneously to isolated DC failure
Delay the time of system resumes power significantly.Although the DC side in semi-bridge type modularization multi-level converter installs direct current interruption
Device can preferably solve DC Line Fault isolating problem, but dc circuit breaker technology is still immature at present, reliability have it is to be hoisted,
And dc circuit breaker is with high costs, so that flexible DC transmission technology still remains defect in terms of DC Line Fault isolation.
Hybrid HVDC system can overcome the problems, such as that flexible transmission system exists, such as a kind of DC transmission system,
Its rectification side uses phased inverter, uses semi-bridge type modularization multi-level converter in inverter side, and in the direct current of inverter side
High-voltage diode group is installed in port, which has the DC Line Fault isolation features of unidirectional trend.It also proposes in the industry defeated in direct current
The side of electricity uses phase using the mixed type module multilevel converter based on full-bridge submodule and half-bridge submodule, the other side
The scheme of the Hybrid HVDC technology of inverter is controlled, so that the Hybrid HVDC system has two-way isolated DC event
The ability of barrier, and reduce the cost of Hybrid HVDC to a certain extent and phased inverter and voltage-source type can be had both
The advantages of inverter.
Fig. 2 show a kind of mixed type module multilevel converter topology 2 in the prior art and bridge-type submodule
Topology 5, the topology have the ability for blocking direct fault current.But since mixed type module multilevel converter is compared
It needs in semi-bridge type modularization multi-level converter using more all-controlling power electronics devices, the more level of mixed type moduleization
Inverter cost is still much higher than the cost of semi-bridge type modularization multi-level converter, leads to above-mentioned Hybrid HVDC technology still
So have the shortcomings that at high cost, in particular, its speed for restoring electricity after isolated DC failure is also more slowly, there are bright
Aobvious defect.
Occurs a kind of novel Modularized multi-level converter sub-module topology in the industry at present, referred to as from resistance type submodule
Block (Self-blocking Sub-module), such as disclosed in the earlier patent application 201410233072.0 of applicant certainly
Resistance type submodule and be made of it from one kind disclosed in resistance type modularization multi-level converter and 201610172192.3
Constituted from resistance type submodule and by it from resistance type modularization multi-level converter.It is as shown in Figure 1 one kind typically from resistance type
Modularization multi-level converter (from resistance type MMC) topology 1 and from resistance type submodule topology 4a, 4b.It opens used by the resistance type MMC
It closes number of devices and is considerably less than mixed type MMC, be also lower than mixed type MMC from the cost of resistance type MMC.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of mixed type DC transmission system,
It, as receiving end or sending end converter station, cooperates by using from resistance type modularization multi-level converter with phase controlled rectifier, can
Realization solves the problems, such as that phased inverter cannot connect weak AC network, commutation failure easily occurs；Or it can directly and wind power plant
Be connected, do not need installing reactive power compensator, enable mixed type transmission system with the smallest cost just have DC Line Fault every
From function.
To achieve the above object, according to one aspect of the present invention, a kind of mixed type DC transmission system, feature are provided
Be, the transmission system it include positioned at the phase controlled rectifier of sending end and positioned at receiving end from the resistance type modular multilevel change of current
Device, wherein
The phase controlled rectifier is connect at sending end ac bus by AC transformer with the first AC system, from resistance type
Modularization multi-level converter is connected at receiving end ac bus by AC transformer with the second AC system, described phased whole
Stream device is connected with the DC port from resistance type modularization multi-level converter by corresponding DC power transmission line.
It is formed by technical solution by above-mentioned design, it, can be by being latched from resistance type module when DC Line Fault occurs
Change the driving signal of the all-controlling power electronics device of multilevel converter and sending end phase controlled rectifier is made to work in inverter mode
To extinguish the electric arc of DC Line Fault point, Hybrid HVDC system is enabled to quickly isolate DC Line Fault.
Preferably, the receiving end is sub by including the sub- inverter of anode and cathode from resistance type modularization multi-level converter
Two of inverter are formed from the sub- inverter unit of resistance type by connecting into bipolarity connection type, wherein anode changes
Flow the cathode ground connection of device.
Preferably, the phase controlled rectifier of the sending end is by including two phases of anode inverter and the sub- inverter of cathode
Control rectifier unit is formed by connecting into bipolarity connection type, wherein the cathode of the sub- inverter of anode of phase controlled rectifier
Ground connection.
Preferably, it the cathode of the sub- inverter of phase controlled rectifier anode and is changed from resistance type modularization multi-level converter anode
The cathode of stream device can also be grounded by metallic return.
Preferably, second AC system be two different AC networks, the receiving end it is more from resistance type modularization
Level converter can be connected to two different AC networks, wherein changing from the positive son of resistance type modularization multi-level converter
Stream device anode is connected with DC power transmission line anode, and the exchange side of the sub- inverter of anode is handed over by AC transformer with one of
Galvanic electricity net is connected, and the cathode of the sub- inverter of cathode is connected with DC power transmission line cathode, and cathode inverter exchange side passes through friendship
Convertor transformer is connected with another AC network.
Preferably, the phase controlled rectifier in the mixed type DC transmission system and from resistance type modularization multi-level converter
Using asymmetric positive polarity connection type, wherein phase controlled rectifier is positive and passes through from resistance type modularization multi-level converter anode
DC power transmission line is connected, and phase controlled rectifier and the cathode from resistance type modularization multi-level converter are grounded respectively.
Preferably, the phase controlled rectifier is positive and passes through DC transmission line from resistance type modularization multi-level converter anode
Road is connected, and phase controlled rectifier and the cathode from resistance type modularization multi-level converter are grounded by metallic return.
Preferably, the phase controlled rectifier in the mixed type DC transmission system and from resistance type modularization multi-level converter
Using asymmetric positive polarity connection type, wherein phase controlled rectifier cathode and pass through from resistance type modularization multi-level converter cathode
DC power transmission line is connected, and the anode of two inverters is grounded respectively.
Preferably, phase controlled rectifier cathode and from resistance type modularization multi-level converter cathode pass through DC power transmission line phase
Even, phase controlled rectifier and the anode from resistance type modularization multi-level converter are connected ground connection by metallic return.
Preferably, first AC system can be AC network, single wind power plant, multiple wind farm groups and single
Power station and multiple GROUP OF HYDROPOWER STATIONSs.
Preferably, the public exchange bus of first AC system and the second AC system may be employed without limitation of
Single busbar, double-bus, the mode of connection of sectionalized single busbar connection.
Preferably, the receiving end can be from the all-controlling power electronics device that resistance type modularization multi-level converter uses
Insulate gate pole bipolar junction transistor, integrated gate commutated thyristor or gate level turn-off thyristor.
Preferably, the DC power transmission line of the mixed type DC transmission system can using direct current cables, overhead transmission line,
Overhead transmission line such as mixes at the forms with cable run.
It is another aspect of this invention to provide that a kind of failure separation method of above-mentioned mixed type DC transmission system is provided,
It is characterized in that, after detecting DC Line Fault, is latched the full-control type power electronic therein from resistance type modularization multi-level converter
The driving signal of device, and make phase controlled rectifier work in inverter mode, to extinguish direct-current arc.
It is another aspect of this invention to provide that providing one kind is used for above-mentioned mixed type DC transmission system when restoring electricity
Pre-charge method, which is characterized in that the phase controlled rectifier detect DC Line Fault remove after, put into constant DC current control
It charges to DC power transmission line, it is described to detect from resistance type modularization multi-level converter from resistance type modularization multi-level converter
DC port voltage unlock the driving signal of its all-controlling power electronics device again when being higher than a certain limit value, thus fast quick-recovery
Power supply.
Another aspect according to the invention provides a kind of mixed type DC transmission system, which is characterized in that the mixing
Type DC transmission system includes positioned at sending end from resistance type modularization multi-level converter and positioned at the phased inverter of receiving end,
In, it is described from resistance type modularization multi-level converter by AC transformer with the first AC system the phase at sending end ac bus
Even, the phased inverter is connected at receiving end ac bus by AC transformer with the second AC system, described phased inverse
Become device and is connected with the DC port from resistance type modularization multi-level converter by corresponding DC power transmission line.
It is formed by technical solution by above-mentioned design, it, can be by being latched from resistance type module when DC Line Fault occurs
Change the driving signal of the all-controlling power electronics device of multilevel converter and sending end phase controlled rectifier is made to work in inverter mode
To extinguish the electric arc of DC Line Fault point, Hybrid HVDC system is enabled to quickly isolate DC Line Fault.
Preferably, the receiving end is sub by including the sub- inverter of anode and cathode from resistance type modularization multi-level converter
Two of inverter are formed from the sub- inverter unit of resistance type by connecting into bipolarity connection type, wherein anode changes
Flow the cathode ground connection of device.
Preferably, the phase controlled rectifier of the sending end is by including two phases of anode inverter and the sub- inverter of cathode
Control rectifier unit is formed by connecting into bipolarity connection type, wherein the cathode of the sub- inverter of anode of phase controlled rectifier
Ground connection.
Preferably, it the cathode of the sub- inverter of phased inverter anode and is changed from resistance type modularization multi-level converter anode
The cathode of stream device can also be grounded by metallic return.
Preferably, second AC system be two different AC networks, the receiving end it is more from resistance type modularization
Level converter can be connected to two different AC networks, wherein changing from the positive son of resistance type modularization multi-level converter
Stream device anode is connected with DC power transmission line anode, and the exchange side of the sub- inverter of anode is handed over by AC transformer with one of
Galvanic electricity net is connected, and the cathode of the sub- inverter of cathode is connected with DC power transmission line cathode, and cathode inverter exchange side passes through friendship
Convertor transformer is connected with another AC network.
Preferably, the phased inverter in the mixed type DC transmission system and from resistance type modularization multi-level converter
Using asymmetric positive polarity connection type, wherein phased inverter is positive and passes through from resistance type modularization multi-level converter anode
DC power transmission line is connected, and phased inverter and the cathode from resistance type modularization multi-level converter are grounded respectively.
Preferably, the phased inverter is positive and passes through DC transmission line from resistance type modularization multi-level converter anode
Road is connected, and phased inverter and the cathode from resistance type modularization multi-level converter are grounded by metallic return.
Preferably, the phased inverter in the mixed type DC transmission system and from resistance type modularization multi-level converter
Using asymmetric positive polarity connection type, wherein phased inverter cathode and passing through from resistance type modularization multi-level converter cathode
DC power transmission line is connected, and the anode of two inverters is grounded respectively.
Preferably, phased inverter cathode and from resistance type modularization multi-level converter cathode pass through DC power transmission line phase
Even, phased inverter and the anode from resistance type modularization multi-level converter are connected ground connection by metallic return.
Preferably, the sending end is controlled from resistance type modularization multi-level converter using alternating voltage is determined, the receiving end phase
It controls inverter and uses constant DC voltage control.
Preferably, first AC system can be AC network, single wind power plant, multiple wind farm groups and single
Power station and multiple GROUP OF HYDROPOWER STATIONSs.
Preferably, the public exchange bus of first AC system and the second AC system may be employed without limitation of
Single busbar, double-bus, the mode of connection of sectionalized single busbar connection.
Preferably, the receiving end can be from the all-controlling power electronics device that resistance type modularization multi-level converter uses
Insulate gate pole bipolar junction transistor, integrated gate commutated thyristor or gate level turn-off thyristor.
Preferably, the DC power transmission line of the mixed type DC transmission system can using direct current cables, overhead transmission line,
Overhead transmission line such as mixes at the forms with cable run.
It is another aspect of this invention to provide that the failure separation method of above-mentioned mixed type DC transmission system is provided, it is special
Sign is, when sending end detects that DC Line Fault occurs from resistance type modularization multi-level converter, is latched its full-control type power electronic
The driving signal of device, the phased inverter of receiving end, which detects, still to be remained operational to extract in DC line when DC Line Fault occurs
Arc energy.
It is another aspect of this invention to provide that after providing a kind of failure for above-mentioned mixed type DC transmission system quickly
The method to restore electricity, which is characterized in that the phased inverter of receiving end detect DC Line Fault remove after, be latched its trigger pulse or
Its DC current instruction value is set to zero by person, and sending end is led to after detecting that DC Line Fault is removed from resistance type modularization multi-level converter
Cross certain control, gradually reduce negative investment from resistance type submodule number to be changed using sending end from resistance type modular multilevel
The AC system for flowing device gives DC power transmission line charging, when sending end is from resistance type modularization multi-level converter and the phased inversion of receiving end
When device detects that respective DC port voltage is higher than certain value, respective closed-loop control, recovery system power supply are put into.
Another aspect according to the invention provides a kind of quickly throwing again certainly for above-mentioned mixed type DC transmission system
The method of resistance type MMC, which is characterized in that after DC Line Fault is removed, gradually reduce in blocking from resistance type submodule
Number reaches to be pre-charged without current-limiting resistance to DC line to route quick pre-charging electricity unloaded after DC Line Fault
Purpose.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) in the present invention, the topological from resistance type submodule of direct fault current ability is blocked by using having, is compared
In bridge-type submodule and clamp dimorphism submodule, reduce submodule quantity and switching loss from resistance type submodule, by this
The modularization multi-level converter (MMC) constituted from resistance type submodule, which has, blocks direct fault current function, is suitable for aerial
Line direct current transportation occasion.
(2) present invention is defeated compared to the mixed type direct current based on phased inverter and semi-bridge type modularization multi-level converter
Electric system has excellent DC Line Fault isolating power, while using less all-controlling power electronics device, and cost is more
It is low.
(3) DC transmission system of the invention and its control method can rapidly extinguish electric arc, can be extensive more quickly
If DC Line Fault still has in multiple power supply and recovery process, due to controlling DC current during restoring electricity to protect
Card will not jeopardize equipment operation when restoring.
Detailed description of the invention
Fig. 1 is mixed type inverter topology, wherein every phase bridge arm of mixed type inverter by half bridge-type submodule
It is formed with the semi-bridge type submodule of half；
Fig. 2 is from resistance type modularization multi-level converter topology, wherein from every phase of resistance type modularization multi-level converter
Bridge arm is made of the semi-bridge type submodule from resistance type submodule and half of half；
Fig. 3 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier is adopted
With the bipolarity mode of connection, receiving end is from resistance type modularization multi-level converter using the pseudo- bipolarity mode of connection；
Fig. 4 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier with
Receiving end is all made of the bipolarity mode of connection from resistance type modularization multi-level converter, is changed respectively by the sub- inverter of anode and cathode
Stream device is connected in series, the cathode of the sub- inverter of phase controlled rectifier anode and from the sub- change of current of resistance type modularization multi-level converter anode
The cathode of device is grounded respectively；
Fig. 5 is mixed type DC transmission system according to an embodiment of the present invention, wherein receiving end is from resistance type modularization
The sub- inverter of multilevel converter anode is connected with the second AC system, and the sub- inverter of cathode is connected with third AC system；
Fig. 6 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier with
Receiving end is all made of the bipolarity mode of connection from resistance type modularization multi-level converter.The cathode of the sub- inverter of phase controlled rectifier anode
It is grounded with the cathode from the sub- inverter of resistance type modularization multi-level converter anode by metallic return；
Fig. 7 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier with
Receiving end is all made of the bipolarity mode of connection, the cathode of the sub- inverter of phase controlled rectifier anode from resistance type modularization multi-level converter
It is grounded with the cathode from the sub- inverter of resistance type modularization multi-level converter anode by metallic return, it is how electric from resistance type modularization
The sub- inverter of flat inverter anode is connected with the second AC system, and the sub- inverter of cathode is connected with third AC system；
Fig. 8 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier with
Receiving end is all made of the asymmetric positive polarity mode of connection, the cathode of phase controlled rectifier and certainly resistance from resistance type modularization multi-level converter
The cathode of type modularization multi-level converter is grounded respectively；
Fig. 9 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier with
Receiving end is all made of the asymmetric positive polarity mode of connection, the cathode of phase controlled rectifier and certainly resistance from resistance type modularization multi-level converter
The cathode of type modularization multi-level converter is grounded by metallic return；
Figure 10 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier
Be all made of the asymmetric negative polarity mode of connection from resistance type modularization multi-level converter with receiving end, the anode of phase controlled rectifier and from
The anode of resistance type modularization multi-level converter is grounded respectively；
Figure 11 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier
Be all made of the asymmetric negative polarity mode of connection from resistance type modularization multi-level converter with receiving end, the anode of phase controlled rectifier and from
The anode of resistance type modularization multi-level converter is grounded by metallic return；
Figure 12 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end power supply is wind-powered electricity generation
Field (14), sending end phase controlled rectifier are exchanging mother with wind power plant (14), reactive power compensator (15) by AC transformer (12)
It is connected at line (7)；
Figure 13 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end is from resistance type module
Change multilevel converter using the pseudo- bipolarity mode of connection, the phased inverter of receiving end uses the bipolarity mode of connection；
The mixed type DC transmission system of Figure 14 according to an embodiment of the present invention, wherein sending end is from resistance type modularization
Multilevel converter and the phased inverter of receiving end are all made of the bipolarity mode of connection, are changed respectively by the sub- inverter of anode and cathode
Stream device is connected in series, cathode and the sub- change of current of phased inverter anode from the sub- inverter of resistance type modularization multi-level converter anode
The cathode of device is grounded respectively；
Figure 15 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end is from resistance type module
Change multilevel converter and the phased inverter of receiving end is all made of the bipolarity mode of connection, the sub- inverter of the phased inverter anode of receiving end
It is connected with the second AC system, the sub- inverter of cathode is connected with third AC system.
Figure 16 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end is from resistance type module
Change multilevel converter and the phased inverter of receiving end is all made of the bipolarity mode of connection, just from resistance type modularization multi-level converter
The cathode of the cathode of extremely sub- inverter and the sub- inverter of phased inverter anode is grounded by metallic return；
Figure 17 is mixed type DC transmission system according to an embodiment of the present invention, and how electric sending end is from resistance type modularization
Flat inverter and the phased inverter of receiving end are all made of the bipolarity mode of connection, change from resistance type modularization multi-level converter anode
The cathode of the cathode and the sub- inverter of phased inverter anode that flow device is grounded by metallic return, phased inverter anode of receiving end
Inverter is connected with the second AC system, and the sub- inverter of cathode is connected with third AC system；
Figure 18 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end is from resistance type module
Change multilevel converter and the phased inverter of receiving end is all made of the asymmetric positive polarity mode of connection, is changed from resistance type modular multilevel
The cathode of the cathode and phased inverter that flow device is grounded respectively；
Figure 19 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier
It is all made of the asymmetric positive polarity mode of connection from resistance type modularization multi-level converter with receiving end, is changed from resistance type modular multilevel
The cathode of the cathode and phased inverter that flow device is grounded by metallic return；
Figure 20 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end is from resistance type module
Change multilevel converter and the phased inverter of receiving end is all made of the asymmetric negative polarity mode of connection, is changed from resistance type modular multilevel
The anode of stream device and the anode of phased inverter are grounded respectively；
Figure 21 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end phase controlled rectifier
It is all made of the asymmetric negative polarity mode of connection from resistance type modularization multi-level converter with receiving end, is changed from resistance type modular multilevel
The anode of the anode and phased inverter that flow device is grounded by metallic return；
Figure 22 is mixed type DC transmission system according to an embodiment of the present invention, wherein sending end power supply is wind-powered electricity generation
Field (14), sending end phase controlled rectifier are exchanging mother with wind power plant (14), reactive power compensator (15) by AC transformer (12)
It is connected at line (7)；
Figure 23 is the bridge arm current controller control from resistance type modularization multi-level converter fast recovery of power supply after a failure
Block diagram processed.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Fig. 3 is that mixed type DC transmission system provided in an embodiment of the present invention is used to hand over from an AC system to another
Streaming system transimission power, use realize DC Line Fault isolation features from resistance type MMC.
Wherein, phase controlled rectifier is made of the sub- inverter 3P and sub- inverter 3N of cathode of anode.Phase controlled rectifier anode
The anode of the anode connection DC power transmission line 6 of inverter 3P, the cathode connection DC power transmission line 6 of the sub- inverter 3N of cathode
The anode of cathode, the cathode and the sub- inverter 3N of cathode of the sub- inverter 3P of anode is directly grounded.
Phased inverter is connected at ac bus 7 by AC transformer 12 with the first AC system 9.
The symmetrical single stage mode of connection is used from resistance type modularization multi-level converter 1, passes through AC transformer 12 and the
Two AC systems 8 are connected at ac bus 7.
When operating normally, phased inverter is in rectification operating status, is in inverter operation state from resistance type inverter.
After detecting that DC Line Fault occurs, the phased urgent phase shift of inverter Trigger Angle switches to inverter operation；From the full control of resistance type MMC
Power electronic devices locking is in negative investment state from the capacitor for hindering submodule, so that fault point electric arc extinguishes rapidly, it is real
The isolation of existing direct fault current.For temporary DC Line Fault, it is also necessary to which transmission system, which has, quickly restarts kinetic force.Due to
DC line has discharged completely when failure occurs, and is in light condition.
In order to avoid generating dash current during restarting, the safety of equipment is endangered, is changed in the present embodiment from resistance type
Stream device preferably uses bridge arm current controller shown in Figure 13, to guarantee that quick recovery process bridge arm electric current did not occurred
Flow phenomenon 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 embodiment is mixed
The receiving end for closing DC transmission system further constitutes bipolarity connection type from the sub- inverter unit 1P and 1N of resistance type by two.From
The anode of the cathode and the sub- inverter 1N of cathode of the sub- inverter 1P of resistance type modularization multi-level converter anode is directly grounded.Fig. 4
With being distinguished as after DC power transmission line breaks down for Fig. 3, topology shown in Fig. 4 can be transmitted electricity by another polar non-faulting
Route continues to run, and ensures the power transmission of a part.
Fig. 5 is the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 5, the embodiment is mixed
The receiving end inverter for closing DC transmission system may further connect two different AC networks.Wherein, receiving end is from resistance type module
Change the sub- inverter of multilevel converter anode to be connected with the second AC system 8, the sub- inverter of cathode and 13 phase of third AC system
Even.
Fig. 6 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in fig. 6, the embodiment
The sending end inverter of Hybrid HVDC system can be grounded by metallic return 11 with receiving end Converter DC-side neutral point.
Compared to topology shown in Fig. 4, DC current passes through metallic return 11 and constitutes circuit so as to avoid straight without flowing through the earth
Corrosion of the galvanic electricity stream to other civil equipments such as metallic conduits along the line.
Fig. 7 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in fig. 7, the embodiment
By metallic return be connected ground connection Hybrid HVDC system may further connect two different AC networks.Wherein
It is connected from the sub- inverter of resistance type modularization multi-level converter anode with the second AC system 8, the sub- inverter of cathode and third are handed over
Streaming system 13 is connected.
Fig. 8 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 8, the embodiment
Mixed type DC transmission system in sending end phase controlled rectifier and receiving end be all made of from resistance type modularization multi-level converter it is not right
Claim the positive polarity mode of connection.The cathode of phase controlled rectifier 3 and cathode from resistance type modularization multi-level converter 1 are grounded respectively.
For the embodiment mixed type DC transmission system when operating normally, 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, as shown in figure 9, the embodiment
Mixed type DC transmission system in sending end phase controlled rectifier and receiving end be all made of from resistance type modularization multi-level converter it is not right
Claim the positive polarity mode of connection.The cathode of phase controlled rectifier 3 and cathode from resistance type modularization multi-level converter 1 point pass through metal
Loop line 11 is grounded, can be to avoid DC current in embodiment illustrated in fig. 8 to other civil equipments such as metallic conduit near earthing pole
Corrosion.
Figure 10 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in Figure 10, the implementation
Sending end phase controlled rectifier and receiving end are all made of not from resistance type modularization multi-level converter in the mixed type DC transmission system of example
The symmetrical negative polarity mode of connection.The anode of phase controlled rectifier and from resistance type modularization multi-level converter anode be grounded respectively.
For the embodiment when operating normally, earthing pole can flow through larger current, and earthing pole can additionally be arranged.
Figure 11 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 11, the implementation
Sending end phase controlled rectifier and receiving end are all made of not from resistance type modularization multi-level converter in the mixed type DC transmission system of example
The symmetrical negative polarity mode of connection.The anode of phase controlled rectifier and anode from resistance type modularization multi-level converter pass through metal and return
Line 11 is grounded.By the above-mentioned means, can avoid in embodiment illustrated in fig. 10 DC current to metallic conduit near earthing pole etc.
The corrosion of other civil equipments.
Figure 12 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 12, the implementation
Example mixed type DC transmission system in contrast to the embodiment of FIG. 3, connect with wind power plant, with can be used for wind energy pass
It is defeated.Using STATCOM device 15 since phased inverter cannot directly be connected with wind power plant, in the present embodiment maintains sending end to hand over
Flow 7 voltage of bus.
Figure 13 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 13, the implementation
The sending end and receiving end of the Hybrid HVDC system of example are respectively by from resistance type modularization multi-level converter 1 and phased inverter 10
It constitutes.Wherein, phased inverter is made of the sub- inverter 10P and sub- inverter 10N of cathode of anode.Phased inverter anode changes
The anode of the anode connection DC power transmission line 6 of device 10P is flowed, the cathode connection DC power transmission line 6 of the sub- inverter 10N of cathode
The anode of cathode, the cathode and the sub- inverter 10N of cathode of the sub- inverter 10P of anode is directly grounded.Phased inverter 10P and 10N
Be connected at ac bus 7 by AC transformer 12 with the second AC system 8.It is adopted from resistance type modularization multi-level converter
With the symmetrical single stage mode of connection, it is connected at ac bus 7 by AC transformer 12 with the first AC system 9.
Further, the topology of the present embodiment has DC Line Fault isolating power.After DC Line Fault occurs, from resistance type MMC
Full control power electronic devices locking, be in negative investment state from the capacitor of resistance type submodule, AC system 9 can not pass through sending end
From resistance type inverter give fault point provide short circuit current.And the phased inverter work of receiving end is in inverter operation state, due to
The unilateral conduction of thyristor device, AC system 8 also can not provide short circuit electricity to fault point by the phased inverter of receiving end
Stream.To realize the isolation of direct fault current.
The difference of embodiment documented by the scheme and Fig. 3 of the present embodiment is, the topology of the present embodiment can directly with
Wind power plant is connected, and does not need installing reactive power compensator.
Figure 14 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 14, the implementation
The sending end of the Hybrid HVDC system of example further constitutes bipolarity wiring from the sub- inverter unit 1P and 1N of resistance type by two
Form.It is directly connect from the anode of the cathode and the sub- inverter 1N of cathode of the sub- inverter 1P of resistance type modularization multi-level converter anode
Ground.
Figure 14 and embodiment illustrated in fig. 13 are distinguished as after DC power transmission line breaks down, and topology shown in Figure 14 can be with
It is continued to run by another polar non-faulting transmission line of electricity, ensures the power transmission of a part.
Figure 15 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 15, the implementation
The receiving end inverter of the Hybrid HVDC system of example may further connect two different AC networks.Wherein, receiving end is phased
The sub- inverter of inverter anode is connected with the second AC system 8, and the sub- inverter of cathode is connected with third AC system 13.
Figure 16 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 16, the implementation
The sending end inverter of the Hybrid HVDC system of example can be connect with receiving end Converter DC-side neutral point by metallic return 11
Ground.Compared to topology shown in Figure 14, DC current passes through metallic return 11 and constitutes circuit to avoid without flowing through the earth
Corrosion of the DC current to other civil equipments such as metallic conduits along the line.
Figure 17 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 17, the implementation
The Hybrid HVDC system by the connected ground connection of metallic return of example may further connect two different AC networks.Its
In be connected from the sub- inverter of resistance type modularization multi-level converter anode with the second AC system 8, the sub- inverter of cathode and third
AC system 13 is connected.
Figure 18 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 19, the implementation
Sending end is all made of not from resistance type modularization multi-level converter and the phased inverter of receiving end in the mixed type DC transmission system of example
The symmetrical positive polarity mode of connection.In the embodiment, the cathode of phased inverter 10 and from resistance type modularization multi-level converter 1
Cathode is grounded respectively.For the embodiment when operating normally, 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, as shown in figure 19, the implementation
Sending end is all made of not from resistance type modularization multi-level converter and the phased inverter of receiving end in the mixed type DC transmission system of example
The symmetrical positive polarity mode of connection.In the embodiment, the cathode of phased inverter 10 and from resistance type modularization multi-level converter 1
Cathode point is grounded by metallic return 11, can be to avoid DC current in embodiment illustrated in fig. 18 to metallic conduit near earthing pole
Deng the corrosion of other civil equipments.
Figure 20 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 20, the implementation
Sending end is all made of not from resistance type modularization multi-level converter and the phased inverter of receiving end in the mixed type DC transmission system of example
The symmetrical negative polarity mode of connection.In the embodiment, the anode of phased inverter 10 and from resistance type modularization multi-level converter 1
Anode is grounded respectively.For the embodiment when operating normally, 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, as shown in figure 20, the implementation
Sending end is all made of not from resistance type modularization multi-level converter and the phased inverter of receiving end in the mixed type DC transmission system of example
The symmetrical negative polarity mode of connection.The anode of phased inverter 10 and anode from resistance type modularization multi-level converter 1 point pass through
Metallic return 11 is grounded, and DC current is to other civil equipments such as metallic conduits near earthing pole in avoidable Figure 20 embodiment
Corrosion.
Figure 22 show the topological structure of the mixed type DC transmission system of another embodiment, as shown in figure 22, the implementation
The mixed type DC transmission system of example is connect unlike embodiment illustrated in fig. 3 with wind power plant, can be used for wind energy biography
It is defeated.Unlike embodiment illustrated in fig. 12, it should directly can handed over from resistance type modularization multi-level converter with wind power plant 14
It flows and is connected at bus 7.
Figure 23 show from resistance type modularization multi-level converter after a failure fast recovery of power supply bridge arm current control
Block diagram.As shown in figure 23, after DC Line Fault removing, by control gradually reduce in blocking from resistance type submodule
Number is pre-charged so as to not put into current-limiting resistance to DC line, reaches quickly pre- to route unloaded after DC Line Fault
The purpose of charging.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of mixed type DC transmission system carries out pre-charge method when restoring electricity, which is characterized in that the mixed type
DC transmission system includes positioned at the phase controlled rectifier of sending end and positioned at receiving end from resistance type modularization multi-level converter,
In, the phase controlled rectifier is connect at sending end ac bus by AC transformer with the first AC system, from resistance type module
Change multilevel converter to be connected at receiving end ac bus by AC transformer with the second AC system, the phase controlled rectifier
It is connected with the DC port from resistance type modularization multi-level converter by corresponding DC power transmission line；Wherein, the sending end
Phase controlled rectifier formed by the sub- inverter of anode and the sub- inverter of cathode by connecting into bipolarity connection type, it is described phased
The cathode ground connection of the sub- inverter of anode of rectifier；The receiving end from resistance type modularization multi-level converter by be respectively anode
Two of sub- inverter and the sub- inverter of cathode are formed from the sub- inverter unit of resistance type by connecting into bipolarity connection type,
In the sub- inverter of anode cathode ground connection；The cathode of the sub- inverter of anode of phase controlled rectifier and from resistance type modular multilevel
The cathode of the sub- inverter of anode of inverter is grounded by metallic return；Second AC system is two different alternating currents
Net, the receiving end can be connected to two different AC networks from resistance type modularization multi-level converter, wherein from resistance type
The sub- inverter anode of anode of modularization multi-level converter is connected with DC power transmission line anode, from resistance type modular multilevel
The exchange side of the sub- inverter of anode of inverter is connected by AC transformer with one of AC network, from resistance type modularization
The cathode of the sub- inverter of the cathode of multilevel converter is connected with DC power transmission line cathode, from the resistance type modular multilevel change of current
The sub- inverter exchange side of the cathode of device is connected by AC transformer with another AC network；
Phase controlled rectifier in the mixed type DC transmission system and from resistance type modularization multi-level converter using asymmetric
Positive polarity connection type, wherein phase controlled rectifier is positive and passes through DC transmission line from resistance type modularization multi-level converter anode
Road is connected, and phase controlled rectifier and the cathode from resistance type modularization multi-level converter are grounded respectively；Or the mixed type direct current is defeated
Phase controlled rectifier in electric system and from resistance type modularization multi-level converter using asymmetric positive polarity connection type, wherein institute
It states phase controlled rectifier anode to be connected with from resistance type modularization multi-level converter anode by DC power transmission line, phase controlled rectifier
It is grounded with the cathode from resistance type modularization multi-level converter by metallic return；Or in the mixed type DC transmission system
Phase controlled rectifier and from resistance type modularization multi-level converter using asymmetric negative polarity connection type, wherein phase controlled rectifier is negative
Pole is connected with from resistance type modularization multi-level converter cathode by DC power transmission line, phase controlled rectifier and from resistance type modularization
The anode of multilevel converter is grounded respectively；Or phase controlled rectifier in the mixed type DC transmission system and from resistance type module
Change multilevel converter using asymmetric negative polarity connection type, wherein phase controlled rectifier cathode and from resistance type modular multilevel
Inverter cathode is connected by DC power transmission line, and phase controlled rectifier and the anode from resistance type modularization multi-level converter pass through
Metallic return, which is connected, to be grounded；
First AC system is AC network, single wind power plant, multiple wind farm groups and single power station and multiple water
Station group；The public exchange bus of first AC system and the second AC system uses but is not limited to single busbar, double mothers
The mode of connection of line, sectionalized single busbar connection；The full-control type power electronic that the receiving end is used from resistance type modularization multi-level converter
Device is insulation gate pole bipolar junction transistor, integrated gate commutated thyristor or gate level turn-off thyristor；The mixed type is straight
The DC power transmission line for flowing transmission system uses direct current cables, overhead transmission line, overhead transmission line or cable run mixed form；
The pre-charge method includes: after the phase controlled rectifier detects that DC Line Fault is removed, to put into constant DC current control
It charges to DC power transmission line, being detected certainly from resistance type modularization multi-level converter in the mixed type DC transmission system
When the DC port voltage of resistance type modularization multi-level converter is higher than a certain limit value, then unlock its all-controlling power electronics device
Driving signal, thus fast recovery of power supply.
2. the method for a kind of pair of mixed type DC transmission system fast recovery of power supply after a failure, which is characterized in that the mixing
Type DC transmission system includes positioned at sending end from resistance type modularization multi-level converter and positioned at the phased inverter of receiving end,
In, it is described from resistance type modularization multi-level converter by AC transformer with the first AC system the phase at sending end ac bus
Even, the phased inverter is connected at receiving end ac bus by AC transformer with the second AC system, described phased inverse
Become device and is connected with the DC port from resistance type modularization multi-level converter by corresponding DC power transmission line；The receiving end
Phased inverter is formed by the sub- inverter of anode and the sub- inverter of cathode by connecting into bipolarity connection type, wherein phased
The cathode ground connection of the sub- inverter of anode of inverter；The sending end from resistance type modularization multi-level converter by the sub- change of current of anode
Device and the sub- inverter of cathode are formed by connecting into bipolarity connection type, wherein described from the resistance type modular multilevel change of current
The cathode ground connection of the sub- inverter of anode of device；It the cathode of the sub- inverter of phased inverter anode and is changed from resistance type modular multilevel
The cathode of the sub- inverter of stream device anode can be also grounded by metallic return；Second AC system is two different alternating currents
Net, the receiving end can be connected to two different AC networks from resistance type modularization multi-level converter, wherein from resistance type
The sub- inverter anode of anode of modularization multi-level converter is connected with DC power transmission line anode, the friendship of the sub- inverter of the anode
Stream side is connected by AC transformer with one of AC network, from the sub- change of current of the cathode of resistance type modularization multi-level converter
The cathode of device is connected with DC power transmission line cathode, and the sub- inverter exchange side of the cathode is exchanged by AC transformer with another
Power grid is connected；
Phased inverter in the mixed type DC transmission system and from resistance type modularization multi-level converter using asymmetric
Positive polarity connection type, wherein phased inverter is positive and passes through DC transmission line from resistance type modularization multi-level converter anode
Road is connected, and phased inverter and the cathode from resistance type modularization multi-level converter are grounded respectively；Or the mixed type direct current is defeated
Phased inverter in electric system and from resistance type modularization multi-level converter using asymmetric positive polarity connection type, wherein phase
Control inverter anode is connected with from resistance type modularization multi-level converter anode by DC power transmission line, phased inverter and oneself
The cathode of resistance type modularization multi-level converter is grounded by metallic return；Or it is phased in the mixed type DC transmission system
Inverter and from resistance type modularization multi-level converter using asymmetric negative polarity connection type, wherein phased inverter cathode and
It is connected from resistance type modularization multi-level converter cathode by DC power transmission line, phased inverter anode and from resistance type modularization
Multilevel converter anode is grounded respectively；Or phased inverter in the mixed type DC transmission system and from resistance type modularization
Multilevel converter is using asymmetric negative polarity connection type, wherein phased inverter cathode and changing from resistance type modular multilevel
It flows device cathode to be connected by DC power transmission line, phased inverter and the anode from resistance type modularization multi-level converter pass through gold
Belong to the connected ground connection of loop line；
The sending end is adopted from resistance type modularization multi-level converter using alternating voltage control, the phased inverter of receiving end is determined
Use constant DC voltage control；
The method of the fast recovery of power supply includes: that the phased inverter of the mixed type DC transmission system receiving end detects directly
After flowing fault clearance, be latched its trigger pulse or its DC current instruction value be set to zero, sending end it is more from resistance type modularization
Level converter detects after DC Line Fault is removed through certain control, gradually reduce it is negative put into from resistance type submodule number
To give DC power transmission line to charge from the AC system of resistance type modularization multi-level converter using sending end, when sending end is from resistance type
When modularization multi-level converter and the phased inverter of receiving end detect that respective DC port voltage is higher than certain value, investment
Respective closed-loop control, recovery system power supply.
3. a kind of method quickly thrown from resistance type modularization multi-level converter for mixed type DC transmission system, special again
Sign is, the mixed type DC transmission system includes positioned at the phase controlled rectifier of sending end and positioned at receiving end from resistance type modularization
Multilevel converter, wherein the phase controlled rectifier is by AC transformer and the first AC system at sending end ac bus
Connection, from resistance type modularization multi-level converter by AC transformer with the second AC system the phase at receiving end ac bus
Even, the phase controlled rectifier and the DC port from resistance type modularization multi-level converter pass through corresponding DC power transmission line phase
Even；Wherein, the phase controlled rectifier of the sending end is by the sub- inverter of anode and the sub- inverter of cathode by connecting into bipolarity wiring
Form forms, the cathode ground connection of the sub- inverter of anode of the phase controlled rectifier；The receiving end from resistance type modular multilevel
Inverter is in pairs by connecting from the sub- inverter unit of resistance type by two of the respectively sub- inverter of anode and the sub- inverter of cathode
Polarity connection type forms, the cathode ground connection of the sub- inverter of anode therein；The cathode of the sub- inverter of anode of phase controlled rectifier
It is grounded with the cathode of the sub- inverter of anode from resistance type modularization multi-level converter by metallic return；Second exchange system
System is two different AC networks, the receiving end from resistance type modularization multi-level converter can be connected to this two it is different
AC network, wherein from the sub- inverter anode of anode and DC power transmission line anode phase of resistance type modularization multi-level converter
Even, it is exchanged from the exchange side of the sub- inverter of anode of resistance type modularization multi-level converter by AC transformer with one of
Power grid is connected, and is connected from the cathode of the sub- inverter of the cathode of resistance type modularization multi-level converter with DC power transmission line cathode,
Pass through AC transformer and another AC network phase from the cathode of resistance type modularization multi-level converter inverter exchange side
Even；Phase controlled rectifier in the mixed type DC transmission system and from resistance type modularization multi-level converter using it is asymmetric just
Polarity connection type, wherein phase controlled rectifier is positive and passes through DC power transmission line from resistance type modularization multi-level converter anode
It is connected, phase controlled rectifier and the cathode from resistance type modularization multi-level converter are grounded respectively；Or the mixed type direct current transportation
Phase controlled rectifier in system and from resistance type modularization multi-level converter using asymmetric positive polarity connection type, wherein described
Phase controlled rectifier anode is connected with from resistance type modularization multi-level converter anode by DC power transmission line, phase controlled rectifier with
It is grounded from the cathode of resistance type modularization multi-level converter by metallic return；Or the phase in the mixed type DC transmission system
Control rectifier and from resistance type modularization multi-level converter using asymmetric negative polarity connection type, wherein phase controlled rectifier cathode
It is connected with from resistance type modularization multi-level converter cathode by DC power transmission line, phase controlled rectifier and more from resistance type modularization
The anode of level converter is grounded respectively；Or phase controlled rectifier in the mixed type DC transmission system and from resistance type modularization
Multilevel converter wherein phase controlled rectifier cathode and is changed from resistance type modular multilevel using asymmetric negative polarity connection type
It flows device cathode to be connected by DC power transmission line, phase controlled rectifier and the anode from resistance type modularization multi-level converter pass through gold
Belong to the connected ground connection of loop line；First AC system is AC network, single wind power plant, multiple wind farm groups and single water power
It stands and multiple GROUP OF HYDROPOWER STATIONSs；The public exchange bus of first AC system and the second AC system uses but is not limited to list
Bus, double-bus, the mode of connection of sectionalized single busbar connection；The full-control type that the receiving end is used from resistance type modularization multi-level converter
Power electronic devices is insulation gate pole bipolar junction transistor, integrated gate commutated thyristor or gate level turn-off thyristor；It is described
The DC power transmission line of mixed type DC transmission system is using direct current cables, overhead transmission line, overhead transmission line or cable run mixing
Form；Or
The mixed type DC transmission system includes positioned at sending end from resistance type modularization multi-level converter and positioned at receiving end
Phased inverter, wherein described to be sent from resistance type modularization multi-level converter by AC transformer with the first AC system
Hold ac bus at be connected, the phased inverter by AC transformer with the second AC system the phase at receiving end ac bus
Even, the phased inverter passes through corresponding DC power transmission line phase with the DC port from resistance type modularization multi-level converter
Even；The phased inverter of the receiving end is by the sub- inverter of anode and the sub- inverter of cathode and connecting into bipolarity connection type
At, wherein the cathode ground connection of the sub- inverter of anode of phased inverter；The sending end from resistance type modularization multi-level converter
It is formed by the sub- inverter of anode and the sub- inverter of cathode by connecting into bipolarity connection type, wherein described from resistance type module
Change the cathode ground connection of the sub- inverter of anode of multilevel converter；The cathode of the sub- inverter of phased inverter anode and from resistance type mould
The cathode of the sub- inverter of block multilevel converter anode can be also grounded by metallic return；Second AC system is two
Different AC networks, the receiving end can be connected to two different alternating currents from resistance type modularization multi-level converter
Net, wherein being connected from the sub- inverter anode of anode of resistance type modularization multi-level converter with DC power transmission line anode, this is just
The exchange side of extremely sub- inverter is connected by AC transformer with one of AC network, from the resistance type modular multilevel change of current
The cathode of the sub- inverter of the cathode of device is connected with DC power transmission line cathode, and the cathode inverter exchange side passes through AC transformation
Device is connected with another AC network；Phased inverter in the mixed type DC transmission system and how electric from resistance type modularization
Flat inverter is using asymmetric positive polarity connection type, wherein phased inverter anode and from resistance type modularization multi-level converter
Anode is connected by DC power transmission line, and phased inverter and the cathode from resistance type modularization multi-level converter are grounded respectively；
Or phased inverter in the mixed type DC transmission system and from resistance type modularization multi-level converter using it is asymmetric just
Polarity connection type, wherein phased inverter is positive and passes through DC power transmission line from resistance type modularization multi-level converter anode
It is connected, phased inverter and the cathode from resistance type modularization multi-level converter are grounded by metallic return；Or the mixed type
Phased inverter in DC transmission system and from resistance type modularization multi-level converter using asymmetric negative polarity connection type,
Wherein phased inverter cathode is connected with from resistance type modularization multi-level converter cathode by DC power transmission line, phased inversion
Device is positive and is grounded respectively from resistance type modularization multi-level converter anode；Or it is phased in the mixed type DC transmission system
Inverter and from resistance type modularization multi-level converter using asymmetric negative polarity connection type, wherein phased inverter cathode and
It is connected from resistance type modularization multi-level converter cathode by DC power transmission line, phased inverter and how electric from resistance type modularization
The anode of flat inverter is connected by metallic return to be grounded；The sending end is handed over from resistance type modularization multi-level converter using fixed
The voltage-controlled system of galvanic electricity, the phased inverter of receiving end use constant DC voltage control；
Described quickly throw again from the method for resistance type modularization multi-level converter includes: after DC Line Fault is removed, to gradually reduce place
In blocking the number from resistance type modularization multi-level converter to without current-limiting resistance give DC line be pre-charged,
Achieve the purpose that route quick pre-charging electricity unloaded after DC Line Fault.
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