CN106786713A - A kind of voltage source converter unit topological structure and control method - Google Patents
A kind of voltage source converter unit topological structure and control method Download PDFInfo
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- CN106786713A CN106786713A CN201611059115.3A CN201611059115A CN106786713A CN 106786713 A CN106786713 A CN 106786713A CN 201611059115 A CN201611059115 A CN 201611059115A CN 106786713 A CN106786713 A CN 106786713A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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 voltage source converter unit topological structure, including：The first module isolation switch (D1) that is serially connected, cell isolation switch (S1), voltage source converter, second unit isolation switch (D2) and connecting wire, the first direct current end points (X1) and the second direct current end points (X2) of the top and end of the series loop respectively as the voltage source converter unit；Unit bypass disconnecting link (D3), it is connected across between the first direct current end points (X1) and the second direct current end points (X2)；Unit bypass switchs (S2), and it is connected across between the nearly voltage source converter end (Y1) of first module isolation switch (D1) and the nearly voltage source converter end (Y2) of second unit isolation switch (D2).The invention also discloses the corresponding control method of the topological structure.The online input of single voltage source converter and exited when the present invention realizes two or more transverter series operations of DC transmission system.
Description
Technical field
The invention belongs to technical field of direct current power transmission, and in particular to a kind of voltage source converter unit topological structure and control
Method.
Background technology
HVDC transmission system can be divided into two types：Customary DC transmission system based on thyristor converter device
And the flexible direct current power transmission system based on full-control type voltage source converter (VSC-HVDC) (LCC-HVDC).Customary DC transmission of electricity system
System low cost, the small, running technology of loss are ripe, and the DC transmission system overwhelming majority being currently running in the world at present is all LCC-
HVDC systems, but customary DC transmission system exist inverter side easily occur commutation failure, it is strong to the dependence of AC system, need to inhale
Receive a large amount of reactive powers, the shortcomings of current conversion station floor space is big；And the flexible direct current power transmission system of a new generation then have can be real
Existing active power and reactive power uneoupled control, can be powered to passive network, compact conformation floor space is small, in the absence of commutation
The advantages of failure problem, but there is also relatively costly defect.Therefore, both comprehensive customary DC transmission of electricity and flexible DC power transmission
Advantage, one end current conversion station uses the Hybrid HVDC skill of voltage source converter using thyristor converter device, other end current conversion station
Art has good future in engineering applications.From the point of view of long term, with the reduction of full-controlled device price used by voltage source converter, two ends
Current conversion station also will be increasingly widely applied using the Technology of HVDC based Voltage Source Converter of voltage source converter.
In order to meet the transmission of electricity demand of remote Large Copacity, customary DC power transmission engineering is changed using two or more IGCTs
The technology of device series connection is flowed to lift the DC voltage level and transmission capacity of DC transmission system, existing multiple crystalline substance locks domestic at present
Pipe transverter tandem type DC transmission engineering builds up and puts into operation.For one end current conversion station using the series connection of thyristor converter device, the other end
Current conversion station uses voltage source converter using the tandem type Hybrid HVDC technology and two ends of voltage source converter series connection
The tandem type Technology of HVDC based Voltage Source Converter of series connection is still in conceptual phase at present.
For the DC transmission system using transverter serial connection technology, the requirement to major loop topological structure and control system
Be that by the online input of transverter in the running of direct current pole and exiting online, with meet direct current pole two or two with
Following demand during upper transverter series operation：1) single transverter can normally be exited and overhauled manually, after maintenance is finished
Can put into and continue to run with；2) can be exited with automatic fault when single transverter breaks down；3) the online throwing of single transverter
Move back the normal operation for not influenceing other transverters, the demand can ensure the operation of tandem type DC transmission system flexibility and
Reliability.The topological structure of current thyristor converter device tandem type DC transmission system and the throwing annealing method of thyristor converter device are equal
It is ripe.
For tandem type Hybrid HVDC system and tandem type flexible direct current power transmission system, such as still changed using IGCT
The online throwing that the topological structure of stream device tandem type DC transmission system carries out voltage source converter is moved back, because voltage source converter is deposited
In capacitance energy storage element, voltage source converter can be caused similar DC side positive pole, the catastrophe failure of negative pole short circuit occur, cause to change
Stream device is thrown and is moved back unsuccessfully, and voltage source converter throws the topology moved back online in having not yet to see achievable tandem type DC transmission system
Structure and control method are suggested, it is therefore necessary to a kind of achievable voltage source converter is provided with reference to the characteristics of voltage source converter
Device throws topological structure and the control method moved back online, defeated to meet tandem type Hybrid HVDC system or tandem type flexible direct current
The operation and maintenance of electric system need.
The content of the invention
It is an object of the invention in view of the shortcomings of the prior art, providing a kind of voltage source converter unit topological structure and control
Method processed, for realizing single voltage source converter during two or more transverter series operations of DC transmission system DC pole
The online input of device and exit online, tandem type Hybrid HVDC system or tandem type flexible direct current power transmission system can be met
Operation and safeguard need.
In order to reach above-mentioned purpose, the technical solution adopted by the present invention is：A kind of voltage source converter unit topology is provided
Structure, it is characterised in that：Changed including the first module isolation switch (D1) that is serially connected, cell isolation switch (S1), voltage source
Stream device, second unit isolation switch (D2) and connecting wire, the top and end of above-mentioned series loop are respectively as the voltage source
The first direct current end points (X1) and the second direct current end points (X2) of inverter unit, for being carried out with other voltage source converter units
Series connection；
Also include unit bypass disconnecting link (D3), it is connected across the first direct current end points (X1) and the second direct current end points (X2)
Between；
Also include unit bypass switch (S2), its nearly voltage source converter for being connected across the first module isolation switch (D1)
Between device end (Y1) and the nearly voltage source converter end (Y2) of second unit isolation switch (D2)；
The series loop includes following two kinds of topological structures：
I) the first direct current end points (X1) is connected to electricity through first module isolation switch (D1), cell isolation switch (S1) successively
Source Con-verters anode (Z1), the second direct current end points (X2) is connected to voltage source converter and bears through second unit isolation switch (D2)
End (Z2)；
Ii) the first direct current end points (X1) is connected to voltage source converter anode (Z1) through first module isolation switch (D1),
Second direct current end points (X2) is connected to voltage source converter through second unit isolation switch (D2), cell isolation switch (S1) successively
Negative terminal (Z2).
In such scheme, voltage source converter in voltage source converter unit using modular multilevel structure and including
The submodule of following two types or one of which type：
First kind submodule is the submodule that positive and negative 03 class level can be exported under non-blocked state；
Equations of The Second Kind submodule be can only be exported under non-blocked state just, the submodule of zero liang of class level.
In such scheme, under the submodule configuration mode of the bridge arm of voltage source converter includes in voltage source converter unit
State two kinds：
Mode one, constitutes per mutually upper and lower bridge arm by the first kind sub-module cascade；
Mode two, is by the first kind submodule, Equations of The Second Kind submodule two types submodule per mutually upper and lower bridge arm
The mixing bridge arm of composition is cascaded, the quantity configuration ratio of the seed module of each bridge arm two is identical and specified in two seed module electric capacity
In the case of voltage identical, the quantity configuration ratio of first kind submodule is more than or equal to 50% in each bridge arm.
Current-limiting resistance is can configure in such scheme, in voltage source converter unit, and for inverter unit, process is moved back in throwing online
In flow through voltage source converter DC current limitation control, it is characterised in that：Structure also includes current-limiting resistance (R1) and electricity
Resistance by-pass switch (S3), resistance by-pass switch (S3) is in parallel with current-limiting resistance (R1), afterwards, then is connected on the topological structure
I) in, gone here and there between voltage source converter negative terminal (Z2) and the nearly voltage source converter end (Y2) of second unit isolation switch (D2)
Connection；Or, resistance by-pass switch (S3) is in parallel with current-limiting resistance (R1), afterwards, then is connected on the structure ii) in, in electricity
Connected between Source Con-verters anode (Z1) and the nearly voltage source converter end (Y1) of first module isolation switch (D1).
Be can configure in such scheme, in voltage source converter unit and exit processing unit for realizing voltage source converter list
Unit's exiting online in the running of direct current pole, it is characterised in that：Also include being formed by least one semiconductor switch device
Exit processing unit；The processing unit is simultaneously connected between the anode of voltage source converter and negative terminal, or and is connected in
Between the anode and negative terminal of voltage source converter submodule；The semiconductor switch device conducting direction of the processing unit with flow through
The DC current direction of voltage source converter is consistent, and remains cut-off state in voltage source converter normal course of operation.
In such scheme, the semiconductor switch device for exiting processing unit is half control type switching device, or full control
Type switching device.
In such scheme, the semiconductor switch device for exiting processing unit is single semiconductor switch device, or
It is multiple semiconductor switch device series connection and/or parallel connection.
In such scheme, the processing unit that exits also includes at least one inductance, the inductance and semiconductor switching device
Part is connected in series.
In such scheme, the inductance for exiting processing unit is single inductance, or multiple inductance series connection and/or simultaneously
Connection.
In addition, the present invention also provides a kind of control method of voltage source converter unit topological structure, it is characterised in that：It is real
Existing online input of the voltage source converter unit in the running of direct current pole, and comprise the steps of：
Step one：The inverter unit input order for issuing is received, input voltage source converter unit is treated and is attached
Operation, the second unit isolation switch (D2) that sequentially closes, first module of closing isolation switch (D1), the unit bypass that closes switch
(S2) unit bypass disconnecting link (D3), is pulled open；
Step 2：The change of current corresponding to voltage source converter unit to be put into of closing becomes service entrance switch and treats input voltage
Voltage source converter in the inverter unit of source carries out charge control, and the voltage source in voltage source converter unit to be put into is changed
The capacitance voltage for flowing each bridge arm submodule of device is charged to close to rated value；
Step 3：Unlock the voltage source converter in voltage source converter unit to be put into and control the direct current of its output
Pressure (Ud) it is 0；
Step 4：Cell isolation switch (S1) closed in voltage source converter unit to be put into, control is flowed through to be waited to put into
DC current (the I of voltage source converter in voltage source converter unitd) to DC current with working voltage source transverter
Unit bypass switch (S2) in voltage source converter unit to be put into is pulled open when actual measured value is of substantially equal；
Step 5：Current conversion station where voltage source converter unit such as to be put into is DC voltage control station, then control to wait to throw
Enter the DC voltage (U of voltage source converter output in voltage source converter unitd) to operational objective value；Voltage source such as to be put into
Current conversion station where inverter unit is DC current control station or dc power control station, then control flows through voltage source to be put into and changes
DC current (the I of voltage source converter in stream device unitd) to operational objective value；Afterwards, voltage source converter unit to be put into
Input is completed.
In above-mentioned voltage source converter unit puts into step 3 online, electricity in voltage source converter unit to be put into is realized
DC voltage (the U of Source Con-verters outputd) be 0 control method, specifically include：By in each bridge arm of the voltage source converter
First kind submodule normal release simultaneously exports the Voltage Reference ripple matched with alternating voltage, the electricity of output per mutually upper and lower bridge arm
Press reference wave amplitude equal and opposite in phase, if being configured with Equations of The Second Kind submodule, Equations of The Second Kind in voltage source converter bridge arm
Submodule is bypassed and exited.
Wherein, the first kind submodule is the submodule that positive and negative 03 class level can be exported under non-blocked state,
The Equations of The Second Kind submodule be can only be exported under non-blocked state just, the submodule of zero liang of class level.
During above-mentioned voltage source converter unit online input, according to first input DC current control station or direct current work(
The inverter unit of rate control station, the order of the inverter unit for putting into DC voltage control station again carry out inverter unit
Line input operation.
The present invention also provides a kind of control method of voltage source converter unit topological structure, it is characterised in that：Realize electricity
Online in the running of direct current pole normally exits Source Con-verters unit, and comprises the steps of：
Step one：Receive the inverter unit for issuing to exit command, control voltage in voltage source converter unit to be retired
DC voltage (the U of source transverter outputd) drop to 0；
Step 2：Unit bypass switch (S2) closed in voltage source converter unit to be retired, flows through electricity to be retired
The DC current of voltage source converter is transferred to unit bypass switch (S2) in Source Con-verters unit；
Step 3：Pull open cell isolation switch (S1) and the locking voltage to be retired in voltage source converter unit to be retired
Voltage source converter in the inverter unit of source；
Step 4：Isolated operation is carried out to voltage source converter unit to be retired, voltage source converter to be retired is sequentially pulled open
The change of current corresponding to device unit becomes service entrance switch, the unit bypass disconnecting link (D3) that closes, pulls open unit bypass switch (S2), pulls open the
One cell isolation disconnecting link (D1), second unit isolation switch (D2) is pulled open, voltage source converter unit to be retired exits completion.
In the online normal exit step one of above-mentioned voltage source converter, electricity in voltage source converter unit to be retired is controlled
DC voltage (the U of Source Con-verters outputd) method that drops to 0, specifically include：By in each bridge arm of the voltage source converter
First kind submodule keeps normal release and exports the Voltage Reference ripple matched with alternating voltage, the output per mutually upper and lower bridge arm
Voltage Reference wave amplitude is equal and opposite in phase, such as voltage source converter bridge arm in be configured with Equations of The Second Kind submodule, then second
Class submodule is bypassed and exited.
Wherein, the first kind submodule is the submodule that positive and negative 03 class level can be exported under non-blocked state,
The Equations of The Second Kind submodule be can only be exported under non-blocked state just, the submodule of zero liang of class level.
During above-mentioned voltage source converter unit is normally exited online, according to first exiting changing for DC voltage control station
Stream device unit, the order of the inverter unit for exiting DC current control station or dc power control station again carry out inverter unit
Online normally exit operation.
Process normally is exited for being configured with the online of voltage source converter unit for exiting processing unit, above-mentioned
Also include step A between step one and step 2：By exiting all half in processing unit for voltage source converter unit to be retired
Conductor switching device triggering and conducting is DC current (Id) current channel is provided；Also include between step 3 and step 4
Step B：Locking voltage source converter unit to be retired exits all semiconductor switch devices in processing unit.
The present invention also provides a kind of control method of voltage source converter unit topological structure, it is characterised in that：Realize electricity
Online failure of the Source Con-verters unit in the running of direct current pole is exited, and is comprised the steps of：
Step one：After detecting that electrical quantity and/or non-electric quantity identify that voltage source converter unit breaks down, to
The inverter unit issues online failure and exits command；
Step 2：Voltage source converter unit to be retired is exited into all semiconductor switch device triggerings in processing unit
It is DC current (I to turn ond) current channel is provided, while the voltage source in locking voltage source converter unit to be retired is changed
Stream device, and the change of current change service entrance switch corresponding to tripping voltage source converter unit to be retired；
Step 3：Unit bypass switch (S2) closed in voltage source converter unit to be retired, flows through electricity to be retired
DC current (the I of voltage source converter in Source Con-verters unitd) it is transferred to unit bypass switch (S2)；
Step 4：Locking voltage source converter unit to be retired exits all semiconductor switch devices in processing unit,
And pull open the switch of the cell isolation in voltage source converter unit to be retired (S1)；
Step 5：Isolated operation is carried out to voltage source converter unit to be retired, the unit bypass disconnecting link (D3) that sequentially closes,
Unit bypass switch (S2) is pulled open, first module isolation switch (D1) is pulled open, is pulled open second unit isolation switch (D2), it is to be retired
Voltage source converter unit exits completion.
During the above-mentioned online failure of voltage source converter unit is exited, the transverter that other current conversion stations correspondence need to be exited
Unit normally exits process according to it and carries out exiting operation accordingly online.
The beneficial effects of the invention are as follows：
1st, the present invention realizes DC transmission system DC by rational voltage source converter unit Topology Structure Design
The online input of single voltage source converter and exited online during two or more transverter series operations of pole, meet and connect
The operation and maintenance of type Hybrid HVDC system or tandem type flexible direct current power transmission system need.
2nd, control method proposed by the present invention can realize tandem type Hybrid HVDC system or tandem type flexible direct current
The online steady of voltage source converter puts into and exits in transmission system, does not influence the normal table of other operation transverters to transport
OK.
Brief description of the drawings
Fig. 1 is the topology diagram of the first embodiment of voltage source converter unit of the present invention；
Fig. 2 is the topology diagram of the second embodiment of voltage source converter unit of the present invention；
Fig. 3 is using the two ends bipolar series type Hybrid HVDC main loop of voltage source converter unit of the present invention
Schematic diagram；
Fig. 4 is using the two ends bipolar series type flexible direct current power transmission system major loop of voltage source converter unit of the present invention
Schematic diagram；
Fig. 5 is the topological schematic diagram of voltage source converter in voltage source converter unit of the present invention, per mutually upper and lower bridge in figure
Arm can be constituted by first kind sub-module cascade, or be constituted by first kind submodule and Equations of The Second Kind submodule Mixed cascading；
Fig. 6 is the topology diagram of the 3rd embodiment of voltage source converter unit of the present invention；
Fig. 7 is the topology diagram of the fourth embodiment of voltage source converter unit of the present invention；
Fig. 8 is three-phase upper and lower bridge when voltage source converter output DC voltage is 0 in voltage source converter unit of the present invention
The Voltage Reference waveform figure of arm output；
Fig. 9 is three-phase alternating current when voltage source converter output DC voltage is 0 in voltage source converter unit of the present invention
Voltage oscillogram；
Figure 10 is that a kind of voltage source converter unit being made up of single semiconductor switch device of the invention exits treatment
The structural representation of device；
Figure 11 is a kind of voltage source converter list being composed in series by single semiconductor switch device and inductance of the invention
Unit exits the structural representation of processing unit；
Figure 12 is that a kind of voltage source converter unit being made up of multiple semiconductor switch devices of the invention exits treatment
The structural representation of device；
Figure 13 is that a kind of voltage source converter unit being made up of multiple semiconductor switch devices and inductance of the invention is moved back
Go out the structural representation of processing unit；
Figure 14 is the first the embodiment topological structure for the voltage source converter unit that processing unit is exited in present invention configuration
Figure；
Figure 15 is second embodiment topological structure of the voltage source converter unit that processing unit is exited in present invention configuration
Figure；
Figure 16 is the third embodiment topological structure for the voltage source converter unit that processing unit is exited in present invention configuration
Figure；
Figure 17 is the 4th kind of embodiment topological structure of the voltage source converter unit that processing unit is exited in present invention configuration
Figure；
Figure 18 is that the two ends bipolar series type of the voltage source converter unit for exiting processing unit using present invention configuration is mixed
Close DC transmission system major loop schematic diagram；
Figure 19 is that the two ends bipolar series type of the voltage source converter unit for exiting processing unit using present invention configuration is soft
Property DC transmission system major loop schematic diagram；
Figure 20 is the first embodiment topology of the voltage source converter that processing unit is exited in configuration in submodule of the present invention
Schematic diagram；
Figure 21 is second embodiment topology of the voltage source converter that processing unit is exited in configuration in submodule of the present invention
Schematic diagram.
Specific embodiment
Below with reference to drawings and the specific embodiments, technical scheme is described in detail.
The present invention provides a kind of voltage source converter unit topological structure and control method, for realizing DC transmission system
The online input of single voltage source converter and exited online during two or more transverter series operations of direct current pole, can be with
Meet the operation of tandem type Hybrid HVDC system or tandem type flexible direct current power transmission system and safeguard needs.
In order to reach above-mentioned purpose, solution of the invention is：
The present invention provides a kind of voltage source converter unit topological structure is used to realize the online input of voltage source converter
With exit online, the voltage source converter unit includes：The first module isolation switch (D1) that is serially connected, cell isolation are opened
Close (S1), voltage source converter, second unit isolation switch (D2) and connecting wire, the top and end point of above-mentioned series loop
Not as the voltage source converter unit the first direct current end points (X1) and the second direct current end points (X2), for other voltage sources
Inverter unit is connected；Also include unit bypass disconnecting link (D3), it is connected across the first direct current end points (X1) and second
Between direct current end points (X2)；Also include unit bypass switch (S2), it is connected across the near of the first module isolation switch (D1)
Between voltage source converter end (Y1) and the nearly voltage source converter end (Y2) of second unit isolation switch (D2)；It is described to connect back
Road includes following two kinds of topological structures：
I) the first direct current end points (X1) is connected to electricity through first module isolation switch (D1), cell isolation switch (S1) successively
Source Con-verters anode (Z1), the second direct current end points (X2) is connected to voltage source converter and bears through second unit isolation switch (D2)
End (Z2), as shown in figure 1, it is applied to voltage source converter unit of the configuration in direct-flow positive pole；
Ii) the first direct current end points (X1) is connected to voltage source converter anode (Z1) through first module isolation switch (D1),
Second direct current end points (X2) is connected to voltage source converter through second unit isolation switch (D2), cell isolation switch (S1) successively
Negative terminal (Z2), as shown in Fig. 2 it is applied to voltage source converter unit of the configuration in direct current negative pole.
The two ends bipolar series type Hybrid HVDC main loop being made up of above-mentioned voltage source converter unit is illustrated
Figure is as shown in Figure 3.
The two ends bipolar series type flexible direct current power transmission system major loop being made up of above-mentioned voltage source converter unit is illustrated
Figure is as shown in Figure 4.
In such scheme, voltage source converter in voltage source converter unit using modular multilevel structure and including
The submodule of following two types or one of which type：
First kind submodule is the submodule that positive and negative 03 class level can be exported under non-blocked state, such as full-bridge submodule
Block (FBSM) etc..
Equations of The Second Kind submodule be can only be exported under non-blocked state just, the submodule of zero liang of class level, such as half-bridge submodule
Block (HBSM), class full-bridge submodule (SFBSM) etc..
In such scheme, the topological schematic diagram of voltage source converter is as shown in figure 5, wherein in voltage source converter unit
Uap、Ubp、UcpThe respectively upper bridge arm voltage of voltage source converter A, B, C three-phases, Uan、Ubn、UcnRespectively under A, B, C three-phase
Bridge arm voltage.
In such scheme, under the submodule configuration mode of the bridge arm of voltage source converter includes in voltage source converter unit
State two kinds：
Mode one, constitutes per mutually upper and lower bridge arm by first kind sub-module cascade, and which can ensure voltage source converter
Device can be output as 0 DC voltage.
Mode two, is by first kind submodule, Equations of The Second Kind submodule two types sub-module cascade per mutually upper and lower bridge arm
The mixing bridge arm of composition, the quantity configuration ratio of the seed module of each bridge arm two is identical, and in two seed module electric capacity rated voltages
In the case of identical, the quantity configuration ratio of first kind submodule is more than or equal to 50% in each bridge arm.Mode two reduces electricity
In Source Con-verters bridge arm the usage quantity of first kind submodule and still can ensure voltage source converter can be output as 0 it is straight
Stream voltage, reduces the design cost and running wastage of voltage source converter, with engineering application value higher.
Loop resistance value in view of voltage source converter unit in such scheme is relatively low, can according to actual needs in voltage
Current-limiting resistance is configured in the inverter unit of source, voltage source is changed in being used to flow through voltage source converter unit during moving back online throwing
Flowing the DC current of device carries out limitation control, and the voltage source converter unit for configuring current-limiting resistance includes：First for being serially connected
Cell isolation disconnecting link (D1), cell isolation switch (S1), voltage source converter, current-limiting resistance (R1), second unit isolation switch
(D2) and connecting wire, first direct current end points of the top and end of the series loop respectively as the voltage source converter unit
(X1) and the second direct current end points (X2), for being connected with other voltage source converter units；Unit bypass disconnecting link (D3), its
It is connected across between the first direct current end points (X1) and the second direct current end points (X2)；Unit bypass switchs (S2), and it is connected across institute
State nearly voltage source converter end (Y1) and the nearly voltage source of second unit isolation switch (D2) of first module isolation switch (D1)
Between transverter end (Y2)；Resistance by-pass switch (S3), it is in parallel with current-limiting resistance (R1)；The series loop includes following
Two kinds of topological structures：
I) the first direct current end points (X1) is connected to electricity through first module isolation switch (D1), cell isolation switch (S1) successively
Source Con-verters anode (Z1), the second direct current end points (X2) connects through second unit isolation switch (D2), current-limiting resistance (R1) successively
Voltage source converter negative terminal (Z2) is connected to, as shown in fig. 6, it is applied to voltage source converter unit of the configuration in direct-flow positive pole；
Ii) the first direct current end points (X1) is connected to voltage through first module isolation switch (D1), current-limiting resistance (R1) successively
Source transverter anode (Z1), the second direct current end points (X2) is successively through second unit isolation switch (D2), cell isolation switch (S1)
Voltage source converter negative terminal (Z2) is connected to, as shown in fig. 7, it is applied to voltage source converter list of the configuration in direct current negative pole
Unit.
The present invention also provides a kind of control method of voltage source converter unit topological structure for realizing voltage source converter
Online input of the device unit in the running of direct current pole, specifically comprises the steps of：
Step one：The inverter unit input order for issuing is received, input voltage source converter unit is treated and is attached
Operation, the second unit isolation switch (D2) that sequentially closes, first module of closing isolation switch (D1), the unit bypass that closes switch
(S2) unit bypass disconnecting link (D3), is pulled open；For the voltage source converter unit to be put into for being configured with current-limiting resistance, current-limiting resistance
It is initially set input state i.e. resistance by-pass switch (S3) and is in point position；
Step 2：The change of current closed corresponding to voltage source converter unit to be put into becomes service entrance switch and to the transverter list
Unit is exchanged do not control charging, starts charge control after exchange does not control charging complete, by the capacitance voltage of each bridge arm submodule
It is charged to close to rated value；
Step 3：Voltage source converter unit to be put into sets the voltage source converter unit in the case where voltage control mode is determined
DC voltage command value (the U of middle voltage source converterd-ord) 0 and to unlock the voltage source converter, in voltage controller effect
DC voltage (the U of lower voltage source converter outputd) 0 is controlled to, now the running status of the voltage source converter is：Each bridge
The Voltage Reference ripple that first kind submodule normal release and output in arm match with alternating voltage, it is defeated per mutually upper and lower bridge arm
The Voltage Reference wave amplitude for going out is equal and opposite in phase, such as voltage source converter bridge arm in be configured with Equations of The Second Kind submodule, then
Two class submodules are bypassed and exited；Voltage Reference waveform such as Fig. 8 institutes of the now upper and lower bridge arm output of the voltage source converter
Show, wherein Uan-ref、Ubn-ref、Ucn-refThe Voltage Reference ripple of bridge arm respectively under voltage source converter A, B, C three-phase,
Uap-ref、Ubp-ref、Ucp-refThe Voltage Reference ripple of bridge arm, U respectively on A, B, C three-phasedFor the voltage source converter output it is straight
Stream voltage；Now the corresponding three-phase alternating current corrugating of the voltage source converter is as shown in figure 9, wherein Ua、Ub、UcRespectively A,
The alternating voltage of B, C three-phase.
Step 4：Close voltage source converter unit to be put into cell isolation switch (S1) complete the voltage source converter
The electrical connection of voltage source converter in unit, the control model of the voltage source converter is taken over seamlessly as Given current controller side
Formula simultaneously sets the DC current command value (I of the voltage source converterd-ord) be working voltage source transverter DC current reality
Border measured value, under current controller effect, the DC current of voltage source converter in the voltage source converter unit is flowed through
(Id) regulation to transverter DC current actual measured value in working voltage source is of substantially equal when pull open unit bypass switch
(S2)；For the voltage source converter unit for being configured with current-limiting resistance, by the resistance that closed after unit bypass switch (S2) is pulled open
Way switch (S3) exits current-limiting resistance (R1)；
Step 5：Current conversion station where voltage source converter unit such as to be put into is DC voltage control station, then will wait to put into
The control model of voltage source converter is taken over seamlessly to determine voltage control mode and setting the voltage in voltage source converter unit
DC voltage command value (the U of source transverterd-ord) it is operational objective value, the voltage source converter list under voltage controller effect
Voltage source converter steps up the DC voltage (U of output in unitd) operational objective value is risen to certain rate ramp；Such as
Current conversion station is DC current control station or dc power control station where voltage source converter unit to be put into, then will treat input electricity
The control model of voltage source converter remains Given current controller mode and sets the voltage source converter in Source Con-verters unit
DC current command value (the I of deviced-ord) be this direct current pole DC current operational objective value, current controller effect under, stream
Through the DC current (I of voltage source converter in the voltage source converter unitd) adjust to the DC current operation of this direct current pole
Desired value；Afterwards, voltage source converter unit input to be put into is completed.
For two-terminal direct current transmission system, the control model for generally using is one end change of current stand control DC current or direct current
Power, other end change of current stand control DC voltage, two ends coordinate and make direct current convey power to maintain desired value, and control model can be with
Changed between the current conversion station of two ends.
During above-mentioned voltage source converter unit online input, according to first input DC current control station or direct current work(
The inverter unit of rate control station, then put into the inverter unit at DC voltage control station order carry out inverter unit
Line input operation.
The present invention also provides a kind of control method of voltage source converter unit topological structure for realizing voltage source converter
Online in the running of direct current pole normally exits device unit, specifically comprises the steps of：
Step one：Receive the inverter unit for issuing to exit command, such as the change of current where voltage source converter unit to be retired
It is DC voltage control station to stand, then the control model of voltage source converter is remained and determines electricity in voltage source converter unit to be retired
Press control mode and set the DC voltage command value (U of the voltage source converterd-ord) it is 0, should under voltage controller effect
DC voltage (the U of voltage source converter output in voltage source converter unitd) drop to 0 with certain rate ramp；Such as treat
It is DC current control station or dc power control station to exit current conversion station where voltage source converter unit, then first by electricity to be retired
The control model of voltage source converter is taken over seamlessly to determine voltage controlling party by Given current controller mode in Source Con-verters unit
Formula simultaneously sets the DC voltage command value (U of the voltage source converterd-ord) it is 0, the voltage source in the presence of voltage controller
DC voltage (the U of voltage source converter output in inverter unitd) drop to 0 with certain rate ramp；When electricity to be retired
DC voltage (the U of voltage source converter output in Source Con-verters unitd) when dropping to 0, the operation of the voltage source converter
State is：First kind submodule in each bridge arm keeps normal release and exports the Voltage Reference ripple matched with alternating voltage,
Exported per mutually upper and lower bridge arm Voltage Reference wave amplitude is equal and opposite in phase, such as voltage source converter bridge arm in be configured with the
Two class submodules, then Equations of The Second Kind submodule bypass and exit.
Step 2：Close voltage source converter unit to be retired unit bypass switch (S2), flow through the voltage source and change
DC current (the I of voltage source converter in stream device unitd) it is transferred to unit bypass switch (S2)；For being configured with current-limiting resistance
Voltage source converter unit, unit bypass switch (S2) close after, pull open resistance by-pass switch (S3) input current-limiting resistance
(R1)；
Step 3：Pull open cell isolation switch (S1) and the locking voltage source converter of voltage source converter unit to be retired
Voltage source converter in device unit；
Step 4：Isolated operation is carried out to voltage source converter unit to be retired, order performs following operation：Pull open and wait to move back
Go out the change of current corresponding to voltage source converter unit to become service entrance switch, the unit bypass disconnecting link (D3) that closes, pull open unit bypass and open
(S2) is closed, first module isolation switch (D1) is pulled open, is pulled open second unit isolation switch (D2), complete voltage source converter to be retired
The electrical isolation of voltage source converter in device unit, voltage source converter unit to be retired exits completion.
During above-mentioned voltage source converter unit is normally exited online, according to first exiting changing for DC voltage control station
Stream device unit, then exit the order of the inverter unit of DC current control station or dc power control station and carry out inverter unit
Online normally exit operation.
When single voltage source converter breaks down, the full-controlled switch device of voltage source converter needs quick lock
With isolated fault, this causes voltage source converter to lose normal control ability, it is impossible to using the above-mentioned online control normally exited
The online failure that method carries out voltage source converter is exited.Through research, place is exited by the configuration in voltage source converter unit
Reason device can realize that the online failure of voltage source converter is exited, and exiting processing unit includes：At least one semiconductor switch
Device, or at least one semiconductor switch device and an inductance, the semiconductor switch device and the inductance series connection and
Into；Described device is simultaneously connected between the anode of voltage source converter and negative terminal, or and is connected in voltage source converter submodule
Between the anode and negative terminal of block (SM).
The semiconductor switch device conducting direction for exiting processing unit and the DC current for flowing through voltage source converter
Direction is consistent, and cut-off state is remained in voltage source converter normal course of operation, and DC transmission system is not being influenceed just
Often operation；The semiconductor switch device is half control type switching device, such as IGCT (SCR), or full-controlled switch device, such as
IGBT, IGCT, IEGT, GTO etc..
Figure 10 show the structure that a kind of voltage source converter unit of single semiconductor switch device exits processing unit
Schematic diagram, in parallel with voltage source converter for described device comprising the first terminal 2 in parallel of terminal 1, second in parallel, 3 is half
Conductor switching device.
Figure 11 show a kind of voltage source converter unit being made up of single semiconductor switch device and inductance and exits place
The structural representation of device is managed, described device and voltage source converter are used for comprising the first terminal 3 in parallel of terminal 1, second in parallel
Parallel connection, the semiconductor switch device 4 negative electrode (if half control type switching device, then referred to as negative electrode, if full-controlled switch
Device is then referred to as emitter stage, and negative electrode is related to if following, identical) it is series at 2 with inductance 5.The inductance 5 can be single electricity
Sense, it is also possible to connected and/or be formed in parallel by multiple inductance.
Figure 12 show a kind of voltage source converter unit being made up of multiple semiconductor switch devices and exits processing unit
Structural representation, be used for described device comprising the first 1, second terminal 4 in parallel of terminal in parallel in parallel with voltage source converter,
Described device is by the multiple semiconductor switch device shapes including but not limited to semiconductor switch device 5 and semiconductor switch device 6
Anode into, the negative electrode of semiconductor switch device 5 and next semiconductor switch device is (if half control type switching device, then claim
It is anode, if full-controlled switch device is then referred to as colelctor electrode, anode is related to if following, identical) 2 are connected in, semiconductor is opened
The anode for closing device 6 is connected in 3 with the negative electrode of a upper semiconductor switch device.All semiconductor switch devices in described device
Same trigger pulse is used, is triggered conducting in synchronization, simultaneously turned off when branch current is reduced to 0, or same
Moment is triggered shut-off.
Figure 13 show a kind of voltage source converter unit being made up of multiple semiconductor switch devices and inductance and exits place
The structural representation of device is managed, described device and voltage source converter are used for comprising the first terminal 5 in parallel of terminal 1, second in parallel
Parallel connection, described device is by the multiple semiconductor switch including but not limited to semiconductor switch device 6 and semiconductor switch device 7
Device is connected formation with inductance 8, and the negative electrode of semiconductor switch device 6 is connected in 2 with the anode of next semiconductor switch device,
The anode of semiconductor switch device 7 is connected in 3, the moon of semiconductor switch device 7 with the negative electrode of a upper semiconductor switch device
Pole is connected in 4 with inductance 8.The inductance 8 can be single inductance, it is also possible to connected and/or be formed in parallel by multiple inductance.Institute
All semiconductor switch devices in device are stated using same trigger pulse, is triggered conducting in synchronization, it is electric in branch road
Stream is simultaneously turned off when being reduced to 0, or is triggered shut-off in synchronization.
It is described to exit processing unit and be connected in when between voltage source converter anode (Z1) and negative terminal (Z2), the voltage
Source inverter unit includes following four kinds of topological structures：
I) structure shown in Figure 14 is applied to voltage source converter unit of the configuration in converting plant direct-flow positive pole, and it exits treatment
The conducting direction of semiconductor switch device is that Z2 points to Z1 in device, with the DC current (I for flowing through voltage source converterd) direction
Unanimously；
Ii) structure shown in Figure 15 is applied to voltage source converter unit of the configuration in Inverter Station direct-flow positive pole, and it exits place
The conducting direction of semiconductor switch device is Z1 sensing Z2 in reason device, with the DC current (I for flowing through voltage source converterd) side
To consistent；
Iii) structure shown in Figure 16 is applied to voltage source converter unit of the configuration in converting plant direct current negative pole, and it exits place
The conducting direction of semiconductor switch device is Z2 sensing Z1 in reason device, with the DC current (I for flowing through voltage source converterd) side
To consistent；
Iv) structure shown in Figure 17 is applied to voltage source converter unit of the configuration in Inverter Station direct current negative pole, and it exits place
The conducting direction of semiconductor switch device is Z1 sensing Z2 in reason device, with the DC current (I for flowing through voltage source converterd) side
To consistent.
Figure 18 show and exits the two ends bipolar series that the voltage source converter unit of processing unit is constituted described in configuration
Type Hybrid HVDC main loop schematic diagram, DC current direction flows to voltage source converter by thyristor converter device current conversion station
Device current conversion station.
Figure 19 show and exits the two ends bipolar series that the voltage source converter unit of processing unit is constituted described in configuration
Type flexible direct current power transmission system major loop schematic diagram, DC current direction flows to voltage source and changes by voltage source converter current conversion station 1
Stream device current conversion station 2.
It is described to exit processing unit and be connected in when between voltage source converter submodule anode (A) and negative terminal (B), it is described
Voltage source converter in voltage source converter unit includes following two kinds of topological structures：
I) structure shown in Figure 20 is applied to configuration in converting plant direct-flow positive pole and the voltage source converter of negative pole, and it exits place
The conducting direction of semiconductor switch device is B sensing A in reason device, with the DC current (I for flowing through voltage source converterd) direction
Unanimously；
Ii) structure shown in Figure 21 is applied to configuration in Inverter Station direct-flow positive pole and the voltage source converter of negative pole, and it is exited
The conducting direction of semiconductor switch device is that A points to B in processing unit, with the DC current (I for flowing through voltage source converterd) side
To consistent.
A phase can be selected in the three-phase bridge arm of voltage source converter in practical engineering application, by the mutually upper and lower bridge
Each submodule of arm is configured and exits processing unit, and remaining two-phase is not configured, to reduce the usage quantity of semiconductor switch device.
It should be noted that be able to can be adopted with the tandem type flexible direct current power transmission system of two-way flow for DC current
Configured with the mode for exiting two groups processing unit reverse parallel connection, it is ensured that the equal energy under two senses of current of forward and reverse
Realize that voltage source converter unit is exited online.
For being configured with the voltage source converter unit for exiting processing unit, can be in above-mentioned voltage source converter list
The step of first online normal withdrawal control method, adds step A between one and step 2：By voltage source converter unit to be retired
All semiconductor switch device triggering and conductings that exit in processing unit be DC current (Id) current channel is provided；In step
Step B is added between rapid three and step 4：Exiting for locking voltage source converter unit to be retired all in processing unit is partly led
Body switching device；Increasing the technological merit of above-mentioned steps is：The voltage source converter unit to be retired in step 2 can be ensured
Unit bypass switch (S2) close before voltage source converter output DC voltage (Ud) it is 0, unit bypass is switched (S2)
Possesses combined floodgate condition.
The present invention also provides a kind of voltage source converter unit and exits processing method, it is characterised in that：Realize that voltage source is changed
Online failure of the stream device unit in the running of direct current pole is exited, and is specifically comprised the steps of：
Step one：After detecting that electrical quantity and/or non-electric quantity identify that voltage source converter unit breaks down, to
The inverter unit issues online failure and exits command；
Step 2：Voltage source converter unit to be retired is exited into all semiconductor switch device triggerings in processing unit
It is DC current (I to turn ond) current channel is provided, while the voltage source in locking voltage source converter unit to be retired is changed
Stream device, and the change of current change service entrance switch corresponding to tripping voltage source converter unit to be retired；
Step 3：Unit bypass switch (S2) closed in voltage source converter unit to be retired, flows through electricity to be retired
DC current (the I of voltage source converter in Source Con-verters unitd) it is transferred to unit bypass switch (S2)；
Step 4：Locking voltage source converter unit to be retired exits all semiconductor switch devices in processing unit,
And pull open the switch of the cell isolation in voltage source converter unit to be retired (S1)；
Step 5：Isolated operation is carried out to voltage source converter unit to be retired, order performs following operation：Close unit
By-pass knife switch (D3), pull open unit bypass switch (S2), pull open first module isolation switch (D1), pull open second unit isolation knife
Lock (D2), completes the electrical isolation of voltage source converter in voltage source converter unit to be retired, voltage source converter to be retired
Unit exits completion.
During the above-mentioned online failure of voltage source converter unit is exited, the transverter that other current conversion stations correspondence need to be exited
Unit normally exits method according to it and carries out exiting operation accordingly online.
It should be noted that the switch, the knife that are configured in voltage source converter unit topological structure embodiment of the present invention
The equipment such as lock are necessary configuration, carry out suitably increasing on this basis and adjustment also falls within the scope of the present invention.
Above example is only explanation technological thought of the invention, it is impossible to limit protection scope of the present invention with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within the scope of the present invention
Within.
Claims (18)
1. a kind of voltage source converter unit topological structure, it is characterised in that：Including the first module isolation switch being serially connected
(D1), cell isolation switch (S1), voltage source converter, second unit isolation switch (D2) and connecting wire, above-mentioned series connection are returned
The top and end on road respectively as the voltage source converter unit the first direct current end points (X1) and the second direct current end points (X2),
For being connected with other voltage source converter units；
Also include unit bypass disconnecting link (D3), its be connected across the first direct current end points (X1) and the second direct current end points (X2) it
Between；
Also include unit bypass switch (S2), its nearly voltage source converter end for being connected across the first module isolation switch (D1)
(Y1) and the nearly voltage source converter end (Y2) of second unit isolation switch (D2) between；
The series loop includes following two kinds of topological structures：
I) the first direct current end points (X1) is connected to voltage source through first module isolation switch (D1), cell isolation switch (S1) successively
Transverter anode (Z1), the second direct current end points (X2) is connected to voltage source converter negative terminal through second unit isolation switch (D2)
(Z2)；
Ii) the first direct current end points (X1) is connected to voltage source converter anode (Z1), second through first module isolation switch (D1)
Direct current end points (X2) is connected to voltage source converter negative terminal through second unit isolation switch (D2), cell isolation switch (S1) successively
(Z2)。
2. a kind of voltage source converter unit topological structure as claimed in claim 1, it is characterised in that：The voltage source converter
Voltage source converter in device unit uses modular multilevel structure,
Voltage source converter includes the submodule of following two types or one of which type,
First kind submodule is the submodule that positive and negative 03 class level can be exported under non-blocked state；
Equations of The Second Kind submodule be can only be exported under non-blocked state just, the submodule of zero liang of class level.
3. a kind of voltage source converter unit topological structure as claimed in claim 2, it is characterised in that：The voltage source converter
The submodule configuration mode of the bridge arm of voltage source converter includes following two kinds in device unit,
Mode one, constitutes per mutually upper and lower bridge arm by the first kind sub-module cascade；
Mode two, is by the first kind submodule, Equations of The Second Kind submodule two types sub-module cascade per mutually upper and lower bridge arm
The mixing bridge arm of composition, the quantity configuration ratio of the seed module of each bridge arm two is identical, and in two seed module electric capacity rated voltages
In the case of identical, the quantity configuration ratio of first kind submodule is more than or equal to 50% in each bridge arm.
4. a kind of voltage source converter unit topological structure as claimed in claim 1, it is characterised in that：Structure also includes current limliting
Resistance (R1) and resistance by-pass switch (S3), resistance by-pass switch (S3) are in parallel with current-limiting resistance (R1), afterwards, then are connected on
In the topological structure i), in voltage source converter negative terminal (Z2) and the nearly voltage source converter of second unit isolation switch (D2)
Connected between end (Y2)；
Or, resistance by-pass switch (S3) is in parallel with current-limiting resistance (R1), afterwards, then is connected on the structure ii) in, in electricity
Connected between Source Con-verters anode (Z1) and the nearly voltage source converter end (Y1) of first module isolation switch (D1).
5. a kind of voltage source converter unit topological structure as claimed in claim 1, it is characterised in that：Also include by least one
What individual semiconductor switch device was formed exits processing unit；The processing unit is simultaneously connected in the anode of voltage source converter and bears
Between end, or and it is connected between the anode of voltage source converter submodule and negative terminal；The semiconductor of the processing unit is opened
Close break-over of device direction consistent with the DC current direction for flowing through voltage source converter, and normally run in voltage source converter
Cut-off state is remained in journey.
6. a kind of voltage source converter unit topological structure as claimed in claim 5, it is characterised in that：It is described to exit treatment dress
The semiconductor switch device put is half control type switching device, or full-controlled switch device.
7. a kind of voltage source converter unit topological structure as claimed in claim 5, it is characterised in that：It is described to exit treatment dress
The semiconductor switch device put is single semiconductor switch device, or multiple semiconductor switch device series connection and/or parallel connection.
8. a kind of voltage source converter unit topological structure as claimed in claim 5, it is characterised in that：It is described to exit treatment dress
Putting also includes at least one inductance, and the inductance and semiconductor switch device are connected in series.
9. a kind of voltage source converter unit topological structure as claimed in claim 8, it is characterised in that：It is described to exit treatment dress
The inductance put is single inductance, or multiple inductance series connection and/or parallel connection.
10. a kind of control method of voltage source converter unit topological structure, it is characterised in that：Realize voltage source converter unit
Online input in the running of direct current pole, comprises the steps of：
Step one：The inverter unit input order for issuing is received, input voltage source converter unit is treated and is attached operation,
Order close second unit isolation switch (D2), first module of closing isolation switch (D1), the unit bypass that closes switch (S2), draw
Open unit bypass disconnecting link (D3)；
Step 2：The change of current corresponding to voltage source converter unit to be put into of closing becomes service entrance switch and treats input voltage source changes
Voltage source converter in stream device unit carries out charge control, by the voltage source converter in voltage source converter unit to be put into
The capacitance voltage of each bridge arm submodule is charged to close to rated value；
Step 3：Unlock the voltage source converter in voltage source converter unit to be put into and control the DC voltage of its output
(Ud) it is 0；
Step 4：Cell isolation switch (S1) closed in voltage source converter unit to be put into, control flows through voltage to be put into
DC current (the I of voltage source converter in the inverter unit of sourced) to DC current reality with working voltage source transverter
When measured value is of substantially equal, unit bypass switch (S2) in voltage source converter unit to be put into is pulled open；
Step 5：Current conversion station where voltage source converter unit such as to be put into is DC voltage control station, then control to treat input electricity
DC voltage (the U of voltage source converter output in Source Con-verters unitd) to operational objective value；
Current conversion station where voltage source converter unit such as to be put into is DC current control station or dc power control station, then control
Flow through the DC current (I of voltage source converter in voltage source converter unit to be put intod) to operational objective value；
Afterwards, voltage source converter unit input to be put into is completed.
A kind of 11. control methods of voltage source converter unit topological structure as claimed in claim 10, it is characterised in that：Step
In rapid three, the DC voltage (U for realizing voltage source converter output in voltage source converter unit to be put intod) be 0 control
Method processed, specifically includes, by the first kind submodule normal release in each bridge arm of the voltage source converter and output and alternating current
The Voltage Reference ripple that matches of pressure, the Voltage Reference wave amplitude exported per mutually upper and lower bridge arm is equal and opposite in phase, if voltage
Equations of The Second Kind submodule is configured with the converter bridge arm of source, then Equations of The Second Kind submodule is bypassed and exited；
Wherein, the first kind submodule is the submodule that positive and negative 03 class level can be exported under non-blocked state, described
Equations of The Second Kind submodule be can only be exported under non-blocked state just, the submodule of zero liang of class level.
A kind of 12. control methods of voltage source converter unit topological structure as claimed in claim 10, it is characterised in that：
The voltage source converter unit is online during input, according to first input DC current control station or dc power control station
Inverter unit, the order of the inverter unit for putting into DC voltage control station again carry out the online input behaviour of inverter unit
Make.
A kind of 13. control methods of voltage source converter unit topological structure, it is characterised in that：Realize voltage source converter unit
Online in the running of direct current pole normally exits, and comprises the steps of：
Step one：Receive the inverter unit for issuing to exit command, voltage source is changed in controlling voltage source converter unit to be retired
DC voltage (the U of stream device outputd) drop to 0；
Step 2：Unit bypass switch (S2) closed in voltage source converter unit to be retired, flows through voltage source to be retired
The DC current of voltage source converter is transferred to unit bypass switch (S2) in inverter unit；
Step 3：Pull open the switch of the cell isolation in voltage source converter unit to be retired (S1) and locking voltage source to be retired is changed
Voltage source converter in stream device unit；
Step 4：Isolated operation is carried out to voltage source converter unit to be retired, is sequentially to pull open voltage source converter to be retired
The change of current corresponding to unit becomes service entrance switch, the unit bypass disconnecting link (D3) that closes, pulls open unit bypass switch (S2), pulls open first
Cell isolation disconnecting link (D1), second unit isolation switch (D2) is pulled open, voltage source converter unit to be retired exits completion.
A kind of 14. control methods of voltage source converter unit topological structure as claimed in claim 13, it is characterised in that：Step
In rapid one, the DC voltage (U of voltage source converter output in the control voltage source converter unit to be retiredd) drop to 0
Method, specifically include by each bridge arm of the voltage source converter first kind submodule keep normal release and output and exchange
The Voltage Reference ripple that voltage matches, exported per mutually upper and lower bridge arm Voltage Reference wave amplitude is equal and opposite in phase, if electric
Equations of The Second Kind submodule is configured with Source Con-verters bridge arm, then Equations of The Second Kind submodule is bypassed and exited；
Wherein, the first kind submodule is the submodule that positive and negative 03 class level can be exported under non-blocked state, described
Equations of The Second Kind submodule be can only be exported under non-blocked state just, the submodule of zero liang of class level.
A kind of 15. control methods of voltage source converter unit topological structure as claimed in claim 13, it is characterised in that：
During the voltage source converter unit is normally exited online, according to first exit DC voltage control station inverter unit,
Exit again the order of the inverter unit of DC current control station or dc power control station carry out inverter unit it is online just
Often exit operation.
A kind of 16. control methods of voltage source converter unit topological structure as claimed in claim 13, it is characterised in that：Institute
State during voltage source converter unit normally exits online, step A is also included between step one and step 2：Will be to be retired
The all semiconductor switch device triggering and conductings in processing unit that exit of voltage source converter unit are DC current (Id) provide
One current channel；
Also include step B between step 3 and step 4：Locking voltage source converter unit to be retired exits processing unit
In all semiconductor switch devices.
A kind of 17. control methods of voltage source converter unit topological structure, it is characterised in that：Realize voltage source converter unit
Online failure in the running of direct current pole is exited, and is comprised the steps of：
Step one：After detecting that electrical quantity and/or non-electric quantity identify that voltage source converter unit breaks down, changed to this
Stream device unit issues online failure and exits command；
Step 2：Voltage source converter unit to be retired is exited into all semiconductor switch device triggering and conductings in processing unit
It is DC current (Id) current channel is provided, while the voltage source converter in locking voltage source converter unit to be retired
Device, and the change of current change service entrance switch corresponding to tripping voltage source converter unit to be retired；
Step 3：Unit bypass switch (S2) closed in voltage source converter unit to be retired, flows through voltage source to be retired
DC current (the I of voltage source converter in inverter unitd) it is transferred to unit bypass switch (S2)；
Step 4：Locking voltage source converter unit to be retired exits all semiconductor switch devices in processing unit, and draws
Open cell isolation switch (S1) in voltage source converter unit to be retired；
Step 5：Isolated operation is carried out to voltage source converter unit to be retired, the unit bypass disconnecting link (D3) that sequentially closes, is pulled open
Unit bypass switchs (S2), pulls open first module isolation switch (D1), pulls open second unit isolation switch (D2), voltage to be retired
Source inverter unit exits completion.
A kind of 18. control methods of voltage source converter unit topological structure as claimed in claim 17, it is characterised in that：
During the online failure of voltage source converter unit is exited, the inverter unit that other current conversion stations correspondence need to be exited is according to it
Normally exiting method online carries out exiting operation accordingly.
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| CN201611059115.3A CN106786713B (en) | 2016-11-25 | 2016-11-25 | A kind of voltage source converter unit topological structure and control method |
| RU2019115377A RU2714121C1 (en) | 2016-11-25 | 2017-11-24 | Installation and method of control of operational input and output in voltage source converter module |
| PCT/CN2017/112844 WO2018095405A1 (en) | 2016-11-25 | 2017-11-24 | On-line input and quit control method and device for voltage-source converter unit |
| US16/345,426 US10797487B2 (en) | 2016-11-25 | 2017-11-24 | On-line input control method, on-line input and quit device for voltage-source converter unit |
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| CN201611059115.3A CN106786713B (en) | 2016-11-25 | 2016-11-25 | A kind of voltage source converter unit topological structure and control method |
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| CN107732954A (en) * | 2017-11-22 | 2018-02-23 | 南京南瑞继保电气有限公司 | A kind of online input control method and device of voltage source converter unit |
| WO2018095405A1 (en) * | 2016-11-25 | 2018-05-31 | 南京南瑞继保电气有限公司 | On-line input and quit control method and device for voltage-source converter unit |
| CN108199571A (en) * | 2018-03-05 | 2018-06-22 | 南京南瑞继保电气有限公司 | A kind of converter unit protection circuit and guard method and device |
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| CN108880291A (en) * | 2018-07-27 | 2018-11-23 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
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| CN110233472A (en) * | 2018-03-05 | 2019-09-13 | 南京南瑞继保电气有限公司 | A kind of voltage source converter fault protecting method and protective device |
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| JP2021520183A (en) * | 2018-05-28 | 2021-08-12 | エヌアール エレクトリック カンパニー リミテッドＮｒ Ｅｌｅｃｔｒｉｃ Ｃｏ．， Ｌｔｄ | Online closing circuit, closing method and equipment of hybrid DC converter valve group |
| CN109039041A (en) * | 2018-07-27 | 2018-12-18 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN108880291A (en) * | 2018-07-27 | 2018-11-23 | 广州智光电气技术有限公司 | For the bypass isolating device of cascade connection type converter system, cascade connection type converter system and control method |
| CN109119981B (en) * | 2018-09-29 | 2020-10-16 | 南京南瑞继保电气有限公司 | Direct-current fault current limiting device and system and current limiting control method thereof |
| CN109119981A (en) * | 2018-09-29 | 2019-01-01 | 南京南瑞继保电气有限公司 | A kind of DC Line Fault current-limiting apparatus and system and its Current limited Control method |
| CN111555628A (en) * | 2020-05-13 | 2020-08-18 | 西安矽力杰半导体技术有限公司 | Circuit topology identification circuit and identification method |
| CN111555628B (en) * | 2020-05-13 | 2023-08-29 | 西安矽力杰半导体技术有限公司 | Circuit topology identification circuit and identification method |
| CN111679233A (en) * | 2020-06-15 | 2020-09-18 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method for positioning measurement abnormity of hybrid direct current engineering control system |
| CN111679233B (en) * | 2020-06-15 | 2022-06-14 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method for positioning measurement abnormity of hybrid direct current engineering control system |
| CN115241964A (en) * | 2021-04-23 | 2022-10-25 | 中电普瑞电力工程有限公司 | Power supply system of offshore platform and fault protection method thereof |
| CN118198987A (en) * | 2024-05-20 | 2024-06-14 | 四川大学 | Energy-consumption type direct current breaker and control method thereof |
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