CN109347136A - A kind of online extractor of Hybrid HVDC system inverter and method - Google Patents
A kind of online extractor of Hybrid HVDC system inverter and method Download PDFInfo
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- CN109347136A CN109347136A CN201811405434.4A CN201811405434A CN109347136A CN 109347136 A CN109347136 A CN 109347136A CN 201811405434 A CN201811405434 A CN 201811405434A CN 109347136 A CN109347136 A CN 109347136A
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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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- 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 online extractor of Hybrid HVDC system inverter and methods, including following content: inverter exits command initiated by master station online, control rectification converter station thyristor transverter increases Trigger Angle, throw thyristor bypass pair, close DC side parallel bypass cock, it is latched thyristor transverter, inverter is isolated in control by-pass knife switch component；It controls inversion converter station and closes DC side parallel bypass circuit, blocking voltage source type inverter, inverter is isolated in control by-pass knife switch component.The present invention can be effectively solved the problem that mixing inverter exits online, realizes that the safety on line of VSC inverter exits, preferably protects the safety of AC/DC Power System.
Description
Technical field
The invention belongs to Hybrid HVDC field, in particular to a kind of Hybrid HVDC system inverter exits online
Device and method.
Background technique
HVDC transmission system can be divided into two types: the customary DC transmission system (LCC- based on thyristor technology
) and the flexible HVDC transmission system based on full-control type voltage source converter (VSC-HVDC) HVDC.Wherein, customary DC transmission of electricity system
Unite (LCC-HVDC) the advantages of be it is at low cost, loss is small, running technology is mature, the disadvantage is that inverter side be easy to happen commutation failure,
, absorption a large amount of idle, converter stations strong to the dependence of AC system take up a large area.And the flexible HVDC transmission system of a new generation
Then having can be realized active power and reactive power decoupling control, can power to passive network, compact-sized occupied area
It is small, be not present inverter side commutation failure problem the advantages that, but its there are it is with high costs, loss it is larger the defects of.In recent years, comprehensive
The Hybrid HVDC technology of LCC-HVDC and VSC-HVDC technology has good future in engineering applications, by adopting in rectification side
With LCC-HVDC, inverter side uses VSC-HVDC, the commutation failure problem of inverter side can be alleviated or avoided, while to a certain degree
Guarantee the advantage in project cost.
In order to meet the requirement of long-distance and large-capacity power transmission, customary DC transmission system generally uses two or more changes of current
The concatenated technology of device carrys out the DC voltage level and transmission capacity of lifting system.Same, the country is implementing mixed at present
Closing DC transmission engineering uses rectification side to connect for two thyristor transverters, and inverter side is two voltage source converter series connection
Or a voltage source converter and a concatenated topological structure of thyristor transverter.
For the DC transmission system using inverter serial connection technology, it is a key technology that inverter, which is thrown move back online,.It changes
Stream device throws online move back can guarantee single converter exit with it is out of service do not influence it is another connect inverter normal operation, from
And guarantee the flexibility and reliability of tandem type DC transmission system operation.The thyristor-type of current customary DC transmission system changes
The online throwing of stream device moves back that technology is more mature, and online throw of the voltage source converter of Hybrid HVDC system moves back technology still
Among research.Patent CN106655125A is proposed a kind of put into online based on single valve group in a kind of mixed DC system and moved back
Method out, voltage source converter, which uses, in mentioned method has full-bridge submodule, is not particularly suited for using half-bridge submodule
Voltage source converter does not have versatility.
Therefore, the present invention provides a kind of online extractor of Hybrid HVDC system inverter and method, can have
Effect solves the problems, such as that mixing inverter exits online, realizes exiting online for series connection VSC inverter, the friendship reduced when exiting is straight
Rush of current is flowed, the safety of each transmission facility is preferably protected.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of online extractor of Hybrid HVDC system inverter and method,
Applying at least one end is the rectification converter station containing thyristor transverter, and one end is the inverse transformation containing voltage source converter
The Hybrid HVDC system of stream station composition.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme: one kind is mixed
The online extractor of DC transmission system inverter is closed, the Hybrid HVDC system includes for connecting sending end AC network
Rectification converter station, the inversion converter station for connecting receiving end AC network and for connecting the rectification converter station and inversion change of current
The DC power transmission line stood, the rectification converter station include at least one set of thyristor transverter unit, the inversion converter station packet
Include at least one set of voltage source converter unit；
Thyristor transverter unit includes thyristor transverter and bypass cock, and the two is connected in parallel；Or including brilliant lock
Pipe inverter and bypass cock and disconnecting link component, thyristor transverter are connected in parallel with bypass cock, the unit both ends after parallel connection
It is connected respectively with one end of connection disconnecting link, connects the other end parallel connection bypass disconnecting link of disconnecting link；
Thyristor transverter unit exchange side includes alternating current inlet wire switch, the converter power transformer being serially connected；
Voltage source converter unit exchange side includes the alternating current inlet wire switch, converter power transformer and charging electricity being serially connected
Resistance, the both ends of charging resistor by-pass switch also in parallel；
The voltage source converter unit includes voltage source converter and its bypass circuit；Or including voltage-source type
Inverter and its bypass circuit and disconnecting link component, and voltage source converter and its bypass circuit both ends respectively with connection disconnecting link
One end be connected, connect disconnecting link the other end parallel connection bypass disconnecting link；
The online extractor of inverter includes acquisition unit, judgement unit, control unit, in which:
The acquisition unit, for acquiring the DC voltage, DC current, DC fields switch cutter of Hybrid HVDC system
The location status of lock, inverter exit signal online；
The judgement unit, for straight according to acquisition unit each analog quantity collected and the judgement mixing of each digital quantity signal
Whether stream transmission system carries out inverter is exited operation online；
Described control unit, for detecting that Hybrid HVDC system needs to carry out inverter and exists in the judgement unit
When line exits operation, control rectification converter station thyristor transverter increases Trigger Angle, throws thyristor bypass pair, closes DC side parallel
Bypass cock, is latched thyristor transverter, and inverter is isolated in control by-pass knife switch component；It controls inversion converter station and closes DC side simultaneously
Join bypass circuit, blocking voltage source type inverter, inverter is isolated in control by-pass knife switch component.
Preferably, described control unit detects that Hybrid HVDC system needs to carry out inverter in the judgement unit
When exiting operation online, following steps are specifically executed:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(21) it is latched inversion converter station voltage source converter；
(22) after DC current is lower than threshold value or when DC current is lower than threshold value and inversion converter station voltage source
The joined alternating current inlet wire switch of type inverter closes the bypass circuit in parallel of inversion converter station voltage source converter after disconnecting；
(23) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Preferably, described control unit detects that Hybrid HVDC system needs to carry out inverter in the judgement unit
When exiting operation online, following steps are specifically executed:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(31) bypass circuit in parallel of inversion converter station voltage source converter is closed after DC current is lower than threshold value；
(32) it is latched inversion converter station voltage source converter；
(33) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Preferably, the voltage source converter and its bypass circuit are voltage source converter DC terminal and bypass cock
It is in parallel；Or voltage source converter DC terminal is in parallel with bypass thyristor valve；Or voltage source converter DC side series connection
It is in parallel with bypass cock after diode valve；Or after voltage source converter DC side series diode valve with bypass thyristor valve
It is in parallel；Or it is in parallel with bypass cock after voltage source converter DC side series diode valve, while bypass cock both ends are simultaneously
It is associated with bypass thyristor valve；Or it after voltage source converter DC side series diode valve, is opened by DC line and bypass
Parallel connection is closed, while bypass cock both ends are parallel with bypass thyristor valve；Or voltage source converter DC side series diode
It is in parallel with bypass cock after valve, it is in parallel with bypass thyristor valve by DC line；Or voltage source converter DC side string
It is in parallel with bypass thyristor valve after joining diode valve, it is in parallel with bypass cock by DC line.
Preferably, the inverter exits signal online and is triggered by operations staff, and initiator must be master station, and the change of current
Communicating between station must be normal.
Preferably, Inverter Station voltage source converter parallel connection bypass cock has switching-on resistance or combined floodgate inductance.
Preferably, the DC current threshold value value range is 0~0.05pu, and wherein 1pu is rated direct current.
The present invention proposes that a kind of Hybrid HVDC system inverter exits method, the Hybrid HVDC online simultaneously
System include for connect the rectification converter station of sending end AC network, the inversion converter station for connecting receiving end AC network and
For connecting the DC power transmission line of rectification converter station and inversion converter station, the rectification converter station includes at least one set of thyristor
Inverter unit, the inversion converter station include at least one set of voltage source converter unit；
Thyristor transverter unit includes thyristor transverter and bypass cock, and the two is connected in parallel；Or including brilliant lock
Pipe inverter and bypass cock and disconnecting link component, thyristor transverter are connected in parallel with bypass cock, the unit both ends after parallel connection
It is connected respectively with one end of connection disconnecting link, connects the other end parallel connection bypass disconnecting link of disconnecting link；
Thyristor transverter unit exchange side includes alternating current inlet wire switch, the converter power transformer being serially connected；
Voltage source converter unit exchange side includes the alternating current inlet wire switch, converter power transformer and charging electricity being serially connected
Resistance, the both ends of charging resistor by-pass switch also in parallel；
The voltage source converter unit includes voltage source converter and its bypass circuit；Or including voltage-source type
Inverter and its bypass circuit and disconnecting link component, and voltage source converter and its bypass circuit both ends respectively with connection disconnecting link
One end be connected, connect disconnecting link the other end parallel connection bypass disconnecting link；
The inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter and exits online
After signal, control rectification converter station thyristor transverter increases Trigger Angle, throws thyristor bypass pair, closes DC side parallel bypass and opens
It closes, is latched thyristor transverter, inverter is isolated in control by-pass knife switch component；It controls inversion converter station and closes DC side parallel bypass
Inverter is isolated in circuit, blocking voltage source type inverter, control by-pass knife switch component.
Preferably, the inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter
After line exits signal, following steps are specifically executed:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(21) it is latched inversion converter station voltage source converter；
(22) after DC current is lower than threshold value or when DC current is lower than threshold value and inversion converter station voltage source
The joined alternating current inlet wire switch of type inverter closes the bypass circuit in parallel of inversion converter station voltage source converter after disconnecting；
(23) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Preferably, the inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter
After line exits signal, following steps are specifically executed:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(31) bypass circuit in parallel of inversion converter station voltage source converter is closed after DC current is lower than threshold value；
(32) it is latched inversion converter station voltage source converter；
(33) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Preferably, the voltage source converter and its bypass circuit are voltage source converter DC terminal and bypass cock
It is in parallel；Or voltage source converter DC terminal is in parallel with bypass thyristor valve；Or voltage source converter DC side series connection
It is in parallel with bypass cock after diode valve；Or after voltage source converter DC side series diode valve with bypass thyristor valve
It is in parallel；Or it is in parallel with bypass cock after voltage source converter DC side series diode valve, while bypass cock both ends are simultaneously
It is associated with bypass thyristor valve；Or it after voltage source converter DC side series diode valve, is opened by DC line and bypass
Parallel connection is closed, while bypass cock both ends are parallel with bypass thyristor valve；Or voltage source converter DC side series diode
It is in parallel with bypass cock after valve, it is in parallel with bypass thyristor valve by DC line；Or voltage source converter DC side string
It is in parallel with bypass thyristor valve after joining diode valve, it is in parallel with bypass cock by DC line.
Preferably, the inverter exits signal online and is triggered by operations staff, and initiator must be master station, and the change of current
Communicating between station must be normal.
Preferably, Inverter Station voltage source converter parallel connection bypass cock has switching-on resistance or combined floodgate inductance.
Preferably, the DC current threshold value value range is 0~0.05pu, and wherein 1pu is rated direct current.
The beneficial effects of the present invention are: propose a kind of online extractor of Hybrid HVDC system inverter and method,
It when needing to exit wherein one group of 2 groups of inverters of series operation online, is issued and is ordered by master station, converting plant is by increasing touching
Hair angle to 90 degree or 90 degree operate above, and are zero by the DC current control of Hybrid HVDC system, control the inverter side change of current
Bypass circuit in parallel is closed at station, so that converting plant and Inverter Station obtain exits predetermined inverter in a secured manner.Effectively
It solves the problems, such as that mixing inverter exits online, realizes exiting online for series connection VSC inverter, reduce alterating and direct current when exiting
Stream impact, preferably protects the safety of each transmission facility.
Detailed description of the invention
Fig. 1 is converting plant by thyristor transverter, and Inverter Station is mixed special by the both ends that two kinds of mixed DC inverters form
HVDC transmission system；
Fig. 2 is converting plant by thyristor transverter, and Inverter Station is more by the Mixed cascading that two kinds of mixed DC inverters form
Hold extra-high voltage DC transmission system；
Fig. 3 is the mixing that converting plant 1 and converting plant 2 are made of thyristor transverter, inverter side voltage source converter
Three end DC transmission systems；
Fig. 4 is converting plant by thyristor transverter, and Inverter Station 1 is by thyristor transverter, and Inverter Station 2 is by the voltage-source type change of current
The three end DC transmission system of mixing that device composes in parallel；
Fig. 5 is that converting plant is composed in parallel by thyristor transverter, Inverter Station 1 and Inverter Station 2 by voltage source converter
Three end DC transmission system of mixing；
Fig. 6 is a kind of online extractor of Hybrid HVDC Cascade System inverter of the invention；
Fig. 7 is that a kind of Hybrid HVDC Cascade System inverter of the invention exits method online.
Specific embodiment
Technical solution of the present invention is described in further detail with specific embodiment with reference to the accompanying drawing, so that ability
The technical staff in domain can better understand the present invention and can be practiced, but illustrated embodiment is not as to limit of the invention
It is fixed.
The present invention is suitable for Hybrid HVDC system as depicted in figs. 1 and 2, but is not limited to both transmission systems,
Such as Fig. 3, Fig. 4, three end DC transmission systems of mixing shown in fig. 5 are also applied for the present invention, and the present invention is suitable for all rectifications
Side is there are thyristor transverter, and there are the Hybrid HVDC systems of voltage source converter for inverter side.Below using Fig. 1 as tool
Body embodiment is illustrated.
As shown in Figure 1, Hybrid HVDC system includes: rectification converter station and inversion converter station, the two is straight by two
It flows transmission line of electricity to be connected, in which: rectification converter station 20 is for after being converted to direct current for the three-phase alternating current of sending end AC network
Inversion converter station 21 is sent to by DC power transmission line, can be connected with passive filtering on the bus 10 that sending end AC network enters the station
Device 23, it is also possible to not have, need to be determined according to system engineering condition, when sending end is made of thyristor transverter, be generally required
Passive filter is installed, also needs to install reactive-load compensation capacitor sometimes.Converter station is rectified in Fig. 1 by two groups of thyristor transverters
Unit 1 is composed in series, and series connection node connects earthing pole 7, and the positive and negative both ends after series connection pass through smoothing reactor 13 and direct current
Transmission line of electricity 15 is connected；DC filter 14 is installed between DC line and the earth simultaneously.
Thyristor transverter unit is using 12 pulsation bridge circuits；Wherein, each bridge arm is by several thyristor strings
Connection is constituted, and thyristor transverter uses constant DC current control policy control.Thyristor transverter passes through a mode of connection point
Not Wei the three-winding transformer 8 of Y0/Y/ Δ connect with sending end AC network, and transformer primary side is installed with alternating current interruption respectively
Device 11.Transformer can carry out voltage class transformation to the three-phase alternating current of sending end AC system, to adapt to required direct current
Press grade, the transformer secondary mode of connection be not all 12 pulsation bridge-type thyristor transverters two six pulse conversions up and down
Bridge provides the three-phase alternating current that phase angle difference is 30 °, to reduce the harmonic current for flowing into power grid.
Inversion converter station is for being conveyed to receiving end AC network after direct current is converted to three-phase alternating current, by two groups of electricity
Potential source type inverter 2 and two groups of thyristor transverters 1 are composed in series, and series connection node connects earthing pole 7, voltage source converter
It is connect by the two-winding transformer 11 that a mode of connection is Y0/ Δ with receiving end AC network, is distinguished in transformer primary side
It is installed with AC circuit breaker 11, voltage source converter, which uses, to be determined DC voltage and determine Reactive Power Control policy control, brilliant lock
Pipe inverter uses constant DC voltage control.
As shown in Figure 1, voltage source converter unit includes voltage source converter 2 and its bypass circuit 71, voltage source
2 both ends parallel connection bypass circuit 71 of type inverter；Or including voltage source converter 2 and disconnecting link component 4,5, the voltage-source type change of current
2 both ends of device are connected with one end of connection disconnecting link 5 respectively, connect the other end parallel connection bypass disconnecting link 4 of disconnecting link；Or including voltage source
Type inverter 2 and its bypass circuit 71 and disconnecting link component 4,5, after 2 both ends parallel connection bypass circuit 71 of voltage source converter respectively
It is connected with one end of connection disconnecting link 5, connects the other end parallel connection bypass disconnecting link 4 of disconnecting link；Or including voltage source converter 2 and
Its bypass circuit 71, blocking diode 32 and disconnecting link component 4,5, voltage source converter 2 concatenate parallel connection after blocking diode 32
Bypass circuit 71,71 both ends of bypass circuit are connected with one end of connection disconnecting link 5 respectively, connect the other end parallel connection bypass knife of disconnecting link
Lock 4；Or including voltage source converter 2 and its bypass circuit 71, current-limiting reactor 61 and disconnecting link component 4,5, voltage-source type is changed
It flows device 2 and concatenates bypass circuit 71 in parallel after current-limiting reactor 61,71 both ends of bypass circuit are connected with one end of connection disconnecting link 5 respectively,
The other end parallel connection for connecting disconnecting link bypasses disconnecting link 4；Or including voltage source converter 2 and its bypass circuit 71, current-limiting reactor
61, blocking diode 32 and disconnecting link component 4,5, voltage source converter 2 concatenate blocking diode 32, parallel connection after current-limiting reactor 61
Bypass circuit 71,71 both ends of bypass circuit are connected with one end of connection disconnecting link 5 respectively, connect the other end parallel connection bypass knife of disconnecting link
Lock 4.
High and low end inverter is thyristor transverter 1 in rectification converter station, and inversion converter station middle and high end inverter is crystalline substance
Brake tube inverter 1, low side inverter are voltage source converter 2.Such as when the rectification high-end inverter of converter station and the low side change of current
Device is being run, the high-end inverter of inversion converter station and low side inverter at runtime, the rectification high-end inverter of converter station with
In coincidence, bypass cock 3 connects disconnecting link 5 in coincidence, bypass in quartile for low side inverter ac bus connection switch or disconnecting link 11
In quartile, the high-end inverter ac bus connection switch of inversion converter station or disconnecting link 11 in coincidence, bypass cock 3 is dividing disconnecting link 4
Position, connection disconnecting link 5 bypass disconnecting link 4 in quartile, Inverter Station low side inverter ac bus connection switch or disconnecting link 11 exist in coincidence
Coincidence, bypass circuit 71 connect disconnecting link 5 in coincidence, bypass disconnecting link 4 in quartile in quartile.Normal feelings are communicated between converter station
Under condition, low side inverter order is exited by master station sending, wherein master station can be converting plant, be also possible to Inverter Station, should
Order is transmitted to by communicating between station to station after issuing.The high-end inverter of rectification converter station and low side inverter increase triggering immediately
To 164 degree, the DC voltage and DC current for controlling Hybrid HVDC system decline at angle, and it is brilliant then to rectify converter station low side
Brake tube inverter 1 puts into thyristor bypass pair, then closes bypass cock 3 in parallel, is then latched low side thyristor transverter 1,
Bypass disconnecting link 4 is finally closed, thyristor transverter 1 is latched, and disconnects bypass cock 3, disconnects disconnecting link 5, is disconnected ac bus and is connected
Switch or disconnecting link 11 are connect, converting plant low side thyristor transverter 1 is isolated.Inverter Station is detecting DC current lower than threshold
The bypass circuit 71 of voltage source converter parallel connection is put into when 0.01pu (1pu is rated direct current), what bypass cock carried
Switching-on resistance or combined floodgate inductance are used to reduce the surge voltage and electric current when closing a floodgate, then blocking voltage source type inverter 2, finally
Bypass disconnecting link 4 is closed, bypass circuit 71 is disconnected, disconnects disconnecting link 5, ac bus connection switch or disconnecting link 11 are disconnected, by inversion
Lower terminal voltage source type inverter 2 of standing isolation.So far it rectifies and the completion of the low side inverter at two station of inversion is exited online.The entire change of current
It is steady that device exits process safety, and remaining high-end inverter restores to operate normally.
It is the online extractor of Hybrid HVDC system inverter of the invention shown in Fig. 6 comprising acquisition unit is sentenced
Other unit, control unit, are below described in detail each unit:
The acquisition unit, for acquiring the DC voltage, DC current, DC fields switch cutter of Hybrid HVDC system
The location status of lock, inverter exit signal online；
The judgement unit, for straight according to acquisition unit each analog quantity collected and the judgement mixing of each digital quantity signal
Whether stream transmission system carries out inverter is exited operation online；
Described control unit, for detecting that Hybrid HVDC system needs to carry out inverter and exists in the judgement unit
When line exits operation, control rectification converter station thyristor transverter increases Trigger Angle, throws thyristor bypass pair, closes DC side parallel
Bypass cock, is latched thyristor transverter, and inverter is isolated in control by-pass knife switch component；It controls inversion converter station and closes DC side simultaneously
Join bypass circuit, blocking voltage source type inverter, inverter is isolated in control by-pass knife switch component.
Preferred embodiment 1:
Described control unit detects that Hybrid HVDC system needs to carry out inverter and moves back online in the judgement unit
When operating out, following steps are specifically executed:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(21) it is latched inversion converter station voltage source converter；
(22) after DC current is lower than threshold value or when DC current is lower than threshold value and inversion converter station voltage source
The joined alternating current inlet wire switch of type inverter closes the bypass circuit in parallel of inversion converter station voltage source converter after disconnecting；
(23) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Preferred embodiment 2:
Described control unit detects that Hybrid HVDC system needs to carry out inverter and moves back online in the judgement unit
When operating out, following steps are specifically executed:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(31) bypass circuit in parallel of inversion converter station voltage source converter is closed after DC current is lower than threshold value；
(32) it is latched inversion converter station voltage source converter；
(33) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Wherein, the voltage source converter and its bypass circuit be voltage source converter DC terminal and bypass cock simultaneously
Connection；Or voltage source converter DC terminal is in parallel with bypass thyristor valve；Or voltage source converter DC side series connection two
It is in parallel with bypass cock after pole pipe valve；Or after voltage source converter DC side series diode valve with bypass thyristor valve simultaneously
Connection；Or it is in parallel with bypass cock after voltage source converter DC side series diode valve, while bypass cock both ends are in parallel
There is bypass thyristor valve；Or after voltage source converter DC side series diode valve, by DC line and bypass cock
Parallel connection, while bypass cock both ends are parallel with bypass thyristor valve；Or voltage source converter DC side series diode valve
Afterwards, in parallel with bypass cock, it is in parallel with bypass thyristor valve by DC line；Or voltage source converter DC side series connection
It is in parallel with bypass thyristor valve after diode valve, it is in parallel with bypass cock by DC line.
Wherein, the inverter exits signal online and is triggered by operations staff, can both initiate in converting plant, can also be
Inverter Station is initiated, but must be initiated by master station, and communicating between Converter Station must be normal.
Wherein, Inverter Station voltage source converter parallel connection bypass cock has switching-on resistance or combined floodgate inductance.
Wherein, DC current threshold value value range is 0~0.05pu, and wherein 1pu is rated direct current.
It is that Hybrid HVDC system inverter of the invention exits method, including Hybrid HVDC online shown in Fig. 7
System, the Hybrid HVDC system include for connecting the rectification converter station of sending end AC network, handing over for connecting receiving end
The inversion converter station of galvanic electricity net and DC power transmission line for connecting rectification converter station and inversion converter station, the rectification changes
Stream station includes at least one set of thyristor transverter unit, and the inversion converter station includes at least one set of voltage source converter list
Member；
Thyristor transverter unit includes thyristor transverter and bypass cock, and the two is connected in parallel；Or including brilliant lock
Pipe inverter and bypass cock and disconnecting link component, thyristor transverter are connected in parallel with bypass cock, the unit both ends after parallel connection
It is connected respectively with one end of connection disconnecting link, connects the other end parallel connection bypass disconnecting link of disconnecting link；
Thyristor transverter unit exchange side includes alternating current inlet wire switch, the converter power transformer being serially connected；
Voltage source converter unit exchange side includes the alternating current inlet wire switch, converter power transformer and charging electricity being serially connected
Resistance, the both ends of charging resistor by-pass switch also in parallel；
It is characterized in that, voltage source converter unit includes voltage source converter and its bypass circuit；Or including
Voltage source converter and its bypass circuit and disconnecting link component, and voltage source converter and its bypass circuit both ends respectively and
The one end for connecting disconnecting link is connected, and connects the other end parallel connection bypass disconnecting link of disconnecting link；
The inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter and exits online
After signal, control rectification converter station thyristor transverter increases Trigger Angle, throws thyristor bypass pair, closes DC side parallel bypass and opens
It closes, is latched thyristor transverter, inverter is isolated in control by-pass knife switch component；It controls inversion converter station and closes DC side parallel bypass
Inverter is isolated in circuit, blocking voltage source type inverter, control by-pass knife switch component.
Preferred embodiment 3:
The inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter and exits online
After signal, converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(21) it is latched inversion converter station voltage source converter；
(22) after DC current is lower than threshold value or when DC current is lower than threshold value and inversion converter station voltage source
The joined alternating current inlet wire switch of type inverter closes the bypass circuit in parallel of inversion converter station voltage source converter after disconnecting；
(23) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Preferred embodiment 4:
The inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter and exits online
After signal, converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(31) bypass circuit in parallel of inversion converter station voltage source converter is closed after DC current is lower than threshold value；
(32) it is latched inversion converter station voltage source converter；
(33) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
Wherein, the voltage source converter and its bypass circuit be voltage source converter DC terminal and bypass cock simultaneously
Connection；Or voltage source converter DC terminal is in parallel with bypass thyristor valve；Or voltage source converter DC side series connection two
It is in parallel with bypass cock after pole pipe valve；Or after voltage source converter DC side series diode valve with bypass thyristor valve simultaneously
Connection；Or it is in parallel with bypass cock after voltage source converter DC side series diode valve, while bypass cock both ends are in parallel
There is bypass thyristor valve；Or after voltage source converter DC side series diode valve, by DC line and bypass cock
Parallel connection, while bypass cock both ends are parallel with bypass thyristor valve；Or voltage source converter DC side series diode valve
Afterwards, in parallel with bypass cock, it is in parallel with bypass thyristor valve by DC line；Or voltage source converter DC side series connection
It is in parallel with bypass thyristor valve after diode valve, it is in parallel with bypass cock by DC line.
Wherein, the inverter exits signal online and is triggered by operations staff, can both initiate in converting plant, can also be
Inverter Station is initiated, but must be initiated by master station, and communicating between Converter Station must be normal.
Wherein, Inverter Station voltage source converter parallel connection bypass cock has switching-on resistance or combined floodgate inductance.
Wherein, DC current threshold value value range is 0~0.05pu, and wherein 1pu is rated direct current.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (14)
1. a kind of online extractor of Hybrid HVDC system inverter, the Hybrid HVDC system includes for connecting
The rectification converter station of sending end AC network, the inversion converter station for connecting receiving end AC network and for connecting the rectification change of current
It stands and the DC power transmission line of inversion converter station, the rectification converter station includes at least one set of thyristor transverter unit, described
Inversion converter station includes at least one set of voltage source converter unit；
Thyristor transverter unit includes thyristor transverter and bypass cock, and the two is connected in parallel；Or it is changed including thyristor
Stream device and bypass cock and disconnecting link component, thyristor transverter are connected in parallel with bypass cock, the unit both ends difference after parallel connection
It is connected with one end of connection disconnecting link, connects the other end parallel connection bypass disconnecting link of disconnecting link；
Thyristor transverter unit exchange side includes alternating current inlet wire switch, the converter power transformer being serially connected；
Voltage source converter unit exchange side includes alternating current inlet wire switch, converter power transformer and the charging resistor being serially connected,
The both ends of charging resistor by-pass switch also in parallel；
It is characterized in that, the voltage source converter unit includes voltage source converter and its bypass circuit；Or including
Voltage source converter and its bypass circuit and disconnecting link component, and voltage source converter and its bypass circuit both ends respectively and
The one end for connecting disconnecting link is connected, and connects the other end parallel connection bypass disconnecting link of disconnecting link；
The online extractor of inverter includes acquisition unit, judgement unit, control unit, in which:
The acquisition unit, for acquiring the DC voltage of Hybrid HVDC system, DC current, DC fields switch tool
Location status, inverter exit signal online；
The judgement unit, for judging that mixed DC is defeated according to acquisition unit each analog quantity collected and each digital quantity signal
Whether electric system carries out inverter and exits operation online；
Described control unit, for detecting that Hybrid HVDC system needs to carry out inverter and moves back online in the judgement unit
When operating out, control rectification converter station thyristor transverter increases Trigger Angle, throws thyristor bypass pair, closes DC side parallel bypass
Switch, is latched thyristor transverter, and inverter is isolated in control by-pass knife switch component；Inversion converter station is controlled to close by DC side parallel
Inverter is isolated in circuit passband, blocking voltage source type inverter, control by-pass knife switch component.
2. a kind of online extractor of Hybrid HVDC system inverter according to claim 1, which is characterized in that institute
Control unit is stated when the judgement unit detects that Hybrid HVDC system needs to carry out inverter to exit operation online, is had
Body executes following steps:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(21) it is latched inversion converter station voltage source converter；
(22) after DC current is lower than threshold value or when DC current is lower than threshold value and inversion converter station voltage-source type changes
Flow the bypass circuit in parallel that inversion converter station voltage source converter is closed after the joined alternating current inlet wire switch of device disconnects；
(23) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
3. a kind of online extractor of Hybrid HVDC system inverter according to claim 1, which is characterized in that institute
Control unit is stated when the judgement unit detects that Hybrid HVDC system needs to carry out inverter to exit operation online, is had
Body executes following steps:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(31) bypass circuit in parallel of inversion converter station voltage source converter is closed after DC current is lower than threshold value；
(32) it is latched inversion converter station voltage source converter；
(33) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
4. a kind of online extractor of Hybrid HVDC system inverter according to claim 1, which is characterized in that
The voltage source converter and its bypass circuit are that voltage source converter DC terminal is in parallel with bypass cock；Or electricity
Potential source type inverter DC terminal is in parallel with bypass thyristor valve；Or after voltage source converter DC side series diode valve with
Bypass cock is in parallel；Or it is in parallel with bypass thyristor valve after voltage source converter DC side series diode valve；Or electricity
It is in parallel with bypass cock after potential source type Converter DC-side series diode valve, while bypass cock both ends are parallel with the brilliant lock of bypass
Pipe valve；It is in parallel with bypass cock by DC line or after voltage source converter DC side series diode valve while other
Logical switch ends are parallel with bypass thyristor valve；Or it after voltage source converter DC side series diode valve, is opened with bypass
Parallel connection is closed, it is in parallel with bypass thyristor valve by DC line；Or after voltage source converter DC side series diode valve,
It is in parallel with bypass thyristor valve, it is in parallel with bypass cock by DC line.
5. a kind of online extractor of Hybrid HVDC system inverter according to claim 1, which is characterized in that institute
It states inverter and exits signal online and triggered by operations staff, initiator must be master station, and communication must be just between Converter Station
Often.
6. a kind of online extractor of Hybrid HVDC system inverter according to claim 1, which is characterized in that inverse
Becoming station voltage source converter parallel connection bypass cock has switching-on resistance or combined floodgate inductance.
7. a kind of online extractor of Hybrid HVDC system inverter according to claim 2 or 3, feature exist
In the DC current threshold value value range is 0~0.05pu, and wherein 1pu is rated direct current.
8. a kind of Hybrid HVDC system inverter exits method online, the Hybrid HVDC system includes for connecting
The rectification converter station of sending end AC network, the inversion converter station for connecting receiving end AC network and for connecting the rectification change of current
It stands and the DC power transmission line of inversion converter station, the rectification converter station includes at least one set of thyristor transverter unit, described
Inversion converter station includes at least one set of voltage source converter unit；
Thyristor transverter unit includes thyristor transverter and bypass cock, and the two is connected in parallel；Or it is changed including thyristor
Stream device and bypass cock and disconnecting link component, thyristor transverter are connected in parallel with bypass cock, the unit both ends difference after parallel connection
It is connected with one end of connection disconnecting link, connects the other end parallel connection bypass disconnecting link of disconnecting link；
Thyristor transverter unit exchange side includes alternating current inlet wire switch, the converter power transformer being serially connected；
Voltage source converter unit exchange side includes alternating current inlet wire switch, converter power transformer and the charging resistor being serially connected,
The both ends of charging resistor by-pass switch also in parallel；
It is characterized in that, the voltage source converter unit includes voltage source converter and its bypass circuit；Or including
Voltage source converter and its bypass circuit and disconnecting link component, and voltage source converter and its bypass circuit both ends respectively and
The one end for connecting disconnecting link is connected, and connects the other end parallel connection bypass disconnecting link of disconnecting link；
The inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter and exits signal online
Afterwards, control rectification converter station thyristor transverter increases Trigger Angle, throws thyristor bypass pair, closes DC side parallel bypass cock,
It is latched thyristor transverter, inverter is isolated in control by-pass knife switch component；It controls inversion converter station and closes DC side parallel bypass electricity
Inverter is isolated in road, blocking voltage source type inverter, control by-pass knife switch component.
9. a kind of Hybrid HVDC system inverter according to claim 8 exits method online, which is characterized in that institute
It states inverter and exits method online and include the following steps, obtain Hybrid HVDC system inverter after line exits signal, tool
Body executes following steps:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(21) it is latched inversion converter station voltage source converter；
(22) after DC current is lower than threshold value or when DC current is lower than threshold value and inversion converter station voltage-source type changes
Flow the bypass circuit in parallel that inversion converter station voltage source converter is closed after the joined alternating current inlet wire switch of device disconnects；
(23) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
10. a kind of Hybrid HVDC system inverter according to claim 8 exits method online, which is characterized in that
The inverter exits method online and includes the following steps, obtains Hybrid HVDC system inverter after line exits signal,
It is specific to execute following steps:
Converting plant executes following steps:
(1) control rectification converter station increases Trigger Angle to 90 degree or 90 degree and operates above；
(2) control rectification converter station investment thyristor bypass pair；
(3) bypass cock in parallel of rectification converter station thyristor transverter is closed；
(4) locking rectification converter station thyristor transverter；
(5) paralleling switch, the disconnecting link component of control rectification converter station thyristor transverter, inverter is isolated；
Inverter Station executes following steps:
(31) bypass circuit in parallel of inversion converter station voltage source converter is closed after DC current is lower than threshold value；
(32) it is latched inversion converter station voltage source converter；
(33) paralleling switch, the disconnecting link component for controlling inversion converter station voltage source converter, inverter is isolated.
11. a kind of Hybrid HVDC system inverter according to claim 8 exits method online, which is characterized in that
The voltage source converter and its bypass circuit are that voltage source converter DC terminal is in parallel with bypass cock；Or electricity
Potential source type inverter DC terminal is in parallel with bypass thyristor valve；Or after voltage source converter DC side series diode valve with
Bypass cock is in parallel；Or it is in parallel with bypass thyristor valve after voltage source converter DC side series diode valve；Or electricity
It is in parallel with bypass cock after potential source type Converter DC-side series diode valve, while bypass cock both ends are parallel with the brilliant lock of bypass
Pipe valve；It is in parallel with bypass cock by DC line or after voltage source converter DC side series diode valve while other
Logical switch ends are parallel with bypass thyristor valve；Or it after voltage source converter DC side series diode valve, is opened with bypass
Parallel connection is closed, it is in parallel with bypass thyristor valve by DC line；Or after voltage source converter DC side series diode valve,
It is in parallel with bypass thyristor valve, it is in parallel with bypass cock by DC line.
12. a kind of Hybrid HVDC system inverter according to claim 8 exits method online, which is characterized in that
The inverter exits signal online and is triggered by operations staff, and initiator must be master station, and communicate between Converter Station necessary
Normally.
13. a kind of Hybrid HVDC system inverter according to claim 8 exits method online, which is characterized in that
Inverter Station voltage source converter parallel connection bypass cock has switching-on resistance or combined floodgate inductance.
14. a kind of Hybrid HVDC system inverter according to claim 9 or 10 exits method online, feature exists
In the DC current threshold value value range is 0~0.05pu, and wherein 1pu is rated direct current.
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| CN113471918B (en) * | 2021-06-28 | 2022-12-13 | 南京南瑞继保电气有限公司 | Ice melting circuit of extra-high voltage direct-current transmission system and control method and control device thereof |
| CN113471918A (en) * | 2021-06-28 | 2021-10-01 | 南京南瑞继保电气有限公司 | Ice melting circuit of extra-high voltage direct current transmission system and control method and control device thereof |
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