CN109361213A - A kind of Hybrid HVDC Cascade System inverter extractor and method - Google Patents
A kind of Hybrid HVDC Cascade System inverter extractor and method Download PDFInfo
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- CN109361213A CN109361213A CN201811405436.3A CN201811405436A CN109361213A CN 109361213 A CN109361213 A CN 109361213A CN 201811405436 A CN201811405436 A CN 201811405436A CN 109361213 A CN109361213 A CN 109361213A
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- H02J3/005—
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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
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- 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 Hybrid HVDC Cascade System inverter extractor and methods, including following content: the thyristor transverter that control rectification converter station need to exit closes DC side parallel bypass cock, it is latched the thyristor transverter that need to be exited, DC side isolation switch is disconnected, exchange side incoming switch is disconnected；The voltage source converter closure DC side parallel bypass circuit that control inversion converter station need to exit, is latched the voltage source converter that need to be exited, disconnects DC side isolation switch, disconnect exchange side incoming switch；Finally restore the operation power of Hybrid HVDC system.The present invention can be effectively solved the problem that mixing inverter exits online, realize exiting online for series connection VSC inverter, reduces ac and dc current impact when exiting, 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 Cascade System inverter exits
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 Hybrid HVDC Cascade System inverter extractor 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 Hybrid HVDC Cascade System inverter extractor 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 can be effectively solved the problem that mixing inverter exits online, realize series connection VSC
Inverter exits online, reduces ac and dc current impact when exiting, preferably protects the safety of each transmission facility.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme:
A kind of Hybrid HVDC Cascade System inverter extractor, the Hybrid HVDC system includes for connecting
It picks the rectification converter station for holding AC network, the inversion converter station for connecting receiving end AC network and is changed for connecting rectification
The DC power transmission line at stream station and inversion converter station, the rectification converter station include at least one set of thyristor transverter unit, institute
Stating 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 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 series connection inverter extractor for exiting series connection inverter, including acquisition unit, judgement unit, control online
Unit processed, 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 enabling signal；
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, which carries out inverter, is exited operation；
Described control unit, for detecting that Hybrid HVDC system needs to carry out inverter and moves back in the judgement unit
When operating out, the thyristor transverter that control rectification converter station need to exit closes DC side parallel bypass cock, and locking need to be exited
Thyristor transverter, disconnect DC side isolation switch, disconnect exchange side incoming switch；The electricity that control inversion converter station need to exit
Potential source type inverter is closed DC side parallel bypass circuit, is latched the voltage source converter that need to be exited, and disconnects DC side isolation
Disconnecting link disconnects exchange side incoming switch；Finally restore the operation power of Hybrid HVDC system.
Preferably, described control unit detects that Hybrid HVDC system needs to carry out the change of current in the judgement unit
Device specifically executes following steps when exiting operation:
(1) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
In the range of out；
(2) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a2) voltage source converter that locking inversion converter station need to exit；
(b2) it is closed DC side parallel bypass circuit；
(3) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a3) DC side isolation switch is disconnected；
(b3) exchange side incoming switch is disconnected；
(4) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a4) it is closed DC side parallel bypass cock；
(b4) thyristor transverter that locking rectification converter station need to exit；
(5) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a5) DC side isolation switch is disconnected；
(b5) exchange side incoming switch is disconnected；
(6) it controls rectification converter station and reduces Trigger Angle, control inversion converter station increases DC voltage to specified, recovery mixing
The operation power of DC transmission system.
Preferably, described control unit detects that Hybrid HVDC system needs to carry out the change of current in the judgement unit
Device specifically executes following steps when exiting operation:
(21) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
Out
In range；
(22) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a22) it is closed DC side parallel bypass cock；
(b22) thyristor transverter that locking rectification converter station need to exit；
(23) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a23) DC side isolation switch is disconnected；
(b23) exchange side incoming switch is disconnected；
(24) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a24) voltage source converter that locking inversion converter station need to exit；
(b24) it is closed DC side parallel bypass circuit；
(25) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a25) DC side isolation switch is disconnected；
(b25) exchange side incoming switch is disconnected；
(26) control rectification converter station reduces Trigger Angle, and control inversion converter station increases DC voltage to specified, restores mixed
Close the operation power of DC transmission system.
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 enabling signal and is triggered by operations staff or triggered by fault-signal.
Preferably, control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly galvanic electricity pressure drop down to permission
Inverter refers to the DC current control by Hybrid HVDC system to lower than electric current threshold, DC voltage in the range of exiting
It controls lower than voltage threshold.
Preferably, the electric current threshold value range is 0~0.05pu, and wherein 1pu is rated direct current；Voltage threshold
Value range is 0~0.2pu, and wherein 1pu is rated direct voltage.
The present invention proposes a kind of Hybrid HVDC Cascade System inverter simultaneously and exits method, and the mixed DC is defeated
Electric system include for connect the rectification converter station of sending end AC network, for connect the inversion converter station of receiving end AC network with
And the DC power transmission line for connecting rectification converter station and inversion converter station, the rectification converter station include at least one set of brilliant lock
Pipe 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 exit method be when detecting that Hybrid HVDC system needs to carry out inverter to exit operation,
The thyristor transverter that control rectification converter station need to exit closes DC side parallel bypass cock, and the thyristor that being latched need to exit changes
Device is flowed, DC side isolation switch is disconnected, disconnects exchange side incoming switch；The voltage-source type change of current that control inversion converter station need to exit
Device is closed DC side parallel bypass circuit, is latched the voltage source converter that need to be exited, and disconnects DC side isolation switch, disconnects and handing over
Flow side incoming switch；Finally restore the operation power of Hybrid HVDC system.
Preferably, the inverter exits method and specifically comprises the following steps:
(1) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
In the range of out；
(2) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a2) voltage source converter that locking inversion converter station need to exit；
(b2) it is closed DC side parallel bypass circuit；
(3) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a3) DC side isolation switch is disconnected；
(b3) exchange side incoming switch is disconnected；
(4) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a4) it is closed DC side parallel bypass cock；
(b4) thyristor transverter that locking rectification converter station need to exit；
(5) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a5) DC side isolation switch is disconnected；
(b5) exchange side incoming switch is disconnected；
(6) it controls rectification converter station and reduces Trigger Angle, control inversion converter station increases DC voltage to specified, recovery mixing
The operation power of DC transmission system.
Preferably, the inverter exits method and specifically comprises the following steps:
(21) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
Out
In range；
(22) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a22) it is closed DC side parallel bypass cock；
(b22) thyristor transverter that locking rectification converter station need to exit；
(23) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a23) DC side isolation switch is disconnected；
(b23) exchange side incoming switch is disconnected；
(24) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a24) voltage source converter that locking inversion converter station need to exit；
(b24) it is closed DC side parallel bypass circuit；
(25) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a25) DC side isolation switch is disconnected；
(b25) exchange side incoming switch is disconnected；
(26) control rectification converter station reduces Trigger Angle, and control inversion converter station increases DC voltage to specified, restores mixed
Close the operation power of DC transmission system.
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, control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly galvanic electricity pressure drop down to permission
Inverter refers to the DC current control by Hybrid HVDC system to lower than electric current threshold, DC voltage in the range of exiting
It controls lower than voltage threshold.
Preferably, the electric current threshold value range is 0~0.05pu, and wherein 1pu is rated direct current；Voltage threshold
Value range is 0~0.2pu, and wherein 1pu is rated direct voltage.
The beneficial effects of the present invention are:
The configuration of the present invention is simple, it is easy to operate, it can be effectively solved the problem that mixing inverter exits online, realize string
Connection VSC inverter exits online, reduces ac and dc current impact when exiting, preferably protects the safety of each equipment.
Detailed description of the invention
Fig. 1 is four kinds of topological structures that thyristor transverter unit is connected with voltage source converter unit；
Fig. 2 is four kinds of topological structures that typical thyristor transverter unit is connected with voltage source converter unit；
Fig. 3 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. 4 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. 5 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. 6 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. 7 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. 8 is a kind of online extractor of Hybrid HVDC Cascade System inverter of the invention；
Fig. 9 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.Wherein, identical component uses identical appended drawing reference.
Fig. 1 is four kinds of topological structures that thyristor transverter unit of the present invention is connected with voltage source converter unit.Its
In, Fig. 1 (a) is the topology knot that the cathode X1 of thyristor transverter unit is connected with the cathode X4 of voltage source converter unit
Structure；Fig. 1 (b) is the topology knot that the anode X2 of thyristor transverter unit is connected with the positive X3 of voltage source converter unit
Structure；Fig. 1 (c) is the topology knot that the cathode X1 of thyristor transverter unit is connected with the positive X3 of voltage source converter unit
Structure；Fig. 1 (d) is the topology knot that the anode X2 of thyristor transverter unit is connected with the cathode X4 of voltage source converter unit
Structure.
Fig. 2 is four kinds of topology knots that currently preferred thyristor transverter unit is connected with voltage source converter unit
Structure.Wherein, Fig. 2 (a) is that the cathode of preferred thyristor transverter unit is connected with the cathode of voltage source converter unit
Topological structure；Fig. 2 (b) is that the anode of preferred thyristor transverter unit is connected with the anode of voltage source converter unit
Topological structure；Fig. 2 (c) is that the cathode of preferred thyristor transverter unit is connected with the anode of voltage source converter unit
Topological structure；Fig. 2 (d) is that the anode of preferred thyristor transverter unit is connected with the cathode of voltage source converter unit
Topological structure.Thyristor transverter unit includes thyristor transverter 1 and bypass cock and disconnecting link component, thyristor transverter 1
It is connected in parallel with bypass cock 3, the unit both ends after parallel connection are connected with one end of connection disconnecting link 5 respectively, connect the another of disconnecting link 5
Hold bypass cock or disconnecting link 4 in parallel.Voltage source converter unit includes voltage source converter 2 and bypass cock and disconnecting link group
Part, voltage source converter 2 are connected and are connected in parallel after current-limiting reactor 61 and blocking diode 32 with bypass electronic power switch 71,
Unit both ends after parallel connection one end phase with valve group connecting line connection switch or disconnecting link 5, bus connection switch or disconnecting link 5 respectively
Even, the other end parallel connection bypass cock or disconnecting link 4 of valve group connecting line connection switch or disconnecting link 5, bus connection switch or disconnecting link 5.
In order to match the capacity of thyristor transverter 1, voltage source converter 2 is that an inverter or multiple inverters are in parallel.Optionally,
Increasing in order to preferably inhibit direct fault current, between voltage source converter 2 and current-limiting reactor 61 has the event of disjunction direct current
Hinder the dc circuit breaker of electric current, or increases and flow to equidirectional blocking diode 32 with DC current.
The present invention is suitable for Hybrid HVDC system as shown in Figure 3 and Figure 4, but is not limited to both transmission systems,
Such as Fig. 5, Fig. 6, three end DC transmission systems of mixing shown in Fig. 7 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. 3 as tool
Body embodiment is illustrated.
As shown in figure 3, 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. 3 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 3, 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.When acquisition needs to exit the low side change of current
When device signal, the high-end inverter of rectification converter station and low side inverter increase Trigger Angle to 164 degree immediately, make system dc electric current
It is down near zero, while inversion converter station reduces DC voltage near zero, then rectifies converter station low side thyristor transverter 1
Bypass cock 3 is closed, low side thyristor transverter 1 is then latched, bypass disconnecting link 4 is finally closed, disconnects bypass cock 3, the company of disconnection
Disconnecting link 5 is connect, ac bus connection switch or disconnecting link 11 is disconnected, converting plant low side thyristor transverter 1 is isolated.Inversion converter station
The bypass circuit 71 of voltage source converter parallel connection is put into when detecting DC current lower than threshold, then blocking voltage source type
Inverter 2 finally closes bypass disconnecting link 4, disconnects bypass circuit 71, disconnect disconnecting link 5, disconnects ac bus connection switch or knife
Lock 11 is isolated by Inverter Station lower terminal voltage source type inverter 2.So far it rectifies and the completion of the low side inverter at two station of inversion is moved back online
Out, finally, control rectification converter station reduces Trigger Angle, control inversion converter station increases DC voltage to specified, it is straight to restore mixing
Flow the operation power of transmission system.
It is Hybrid HVDC Cascade System inverter extractor of the invention shown in Fig. 8 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 enabling signal；
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, which carries out inverter, is exited operation；
Described control unit, for detecting that Hybrid HVDC system needs to carry out inverter and moves back in the judgement unit
When operating out, the thyristor transverter that control rectification converter station need to exit closes DC side parallel bypass cock, and locking need to be exited
Thyristor transverter, disconnect DC side isolation switch, disconnect exchange side incoming switch；The electricity that control inversion converter station need to exit
Potential source type inverter is closed DC side parallel bypass circuit, is latched the voltage source converter that need to be exited, and disconnects DC side isolation
Disconnecting link disconnects exchange side incoming switch；Finally restore the operation power of Hybrid HVDC system.
One preferred embodiment 1 are as follows:
Described control unit detects that Hybrid HVDC system needs to carry out inverter and exits behaviour in the judgement unit
As when execute following steps:
(1) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
In the range of out；
(2) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a2) voltage source converter that locking inversion converter station need to exit；
(b2) it is closed DC side parallel bypass circuit；
(3) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a3) DC side isolation switch is disconnected；
(b3) exchange side incoming switch is disconnected；
(4) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a4) it is closed DC side parallel bypass cock；
(b4) thyristor transverter that locking rectification converter station need to exit；
(5) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a5) DC side isolation switch is disconnected；
(b5) exchange side incoming switch is disconnected；
(6) it controls rectification converter station and reduces Trigger Angle, control inversion converter station increases DC voltage to specified, recovery mixing
The operation power of DC transmission system.
One preferred embodiment 2 are as follows:
Described control unit detects that Hybrid HVDC system needs to carry out inverter and exits behaviour in the judgement unit
As when execute following steps:
(21) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
In the range of out；
(22) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a22) it is closed DC side parallel bypass cock；
(b22) thyristor transverter that locking rectification converter station need to exit；
(23) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a23) DC side isolation switch is disconnected；
(b23) exchange side incoming switch is disconnected；
(24) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a24) voltage source converter that locking inversion converter station need to exit；
(b24) it is closed DC side parallel bypass circuit；
(25) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a25) DC side isolation switch is disconnected；
(b25) exchange side incoming switch is disconnected；
(26) control rectification converter station reduces Trigger Angle, and control inversion converter station increases DC voltage to specified, restores mixed
Close the operation power of DC transmission system.
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 enabling signal and is triggered by operations staff or triggered by fault-signal.
Wherein, control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly galvanic electricity pressure drop down to allowing to change
Stream device refers to the DC current control by Hybrid HVDC system to lower than electric current threshold in the range of exiting, direct current is voltage-controlled
It makes lower than voltage threshold；The electric current threshold value range is 0~0.05pu, and wherein 1pu is rated direct current；Voltage door
Sill value range is 0~0.2pu, and wherein 1pu is rated direct voltage.
It is that Hybrid HVDC Cascade System inverter of the invention exits method, the Hybrid HVDC shown in Fig. 9
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；
Above-mentioned 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 exit method be when detecting that Hybrid HVDC system needs to carry out inverter to exit operation,
The thyristor transverter that control rectification converter station need to exit closes DC side parallel bypass cock, and the thyristor that being latched need to exit changes
Device is flowed, DC side isolation switch is disconnected, disconnects exchange side incoming switch；The voltage-source type change of current that control inversion converter station need to exit
Device is closed DC side parallel bypass circuit, is latched the voltage source converter that need to be exited, and disconnects DC side isolation switch, disconnects and handing over
Flow side incoming switch；Finally restore the operation power of Hybrid HVDC system.
One preferred embodiment 3 are as follows:
The inverter exits method and includes the following steps:
(1) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
In the range of out；
(2) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a2) voltage source converter that locking inversion converter station need to exit；
(b2) it is closed DC side parallel bypass circuit；
(3) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a3) DC side isolation switch is disconnected；
(b3) exchange side incoming switch is disconnected；
(4) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a4) it is closed DC side parallel bypass cock；
(b4) thyristor transverter that locking rectification converter station need to exit；
(5) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
The operation order of content is in no particular order:
(a5) DC side isolation switch is disconnected；
(b5) exchange side incoming switch is disconnected；
(6) it controls rectification converter station and reduces Trigger Angle, control inversion converter station increases DC voltage to specified, recovery mixing
The operation power of DC transmission system.
One preferred embodiment 4 are as follows:
The inverter exits method and includes the following steps:
(21) control rectification converter station increase Trigger Angle, control the inversion change of current stand erectly galvanic electricity pressure drop down to allow inverter move back
Out
In range；
(22) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a22) it is closed DC side parallel bypass cock；
(b22) thyristor transverter that locking rectification converter station need to exit；
(23) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts
Content
Operation order in no particular order:
(a23) DC side isolation switch is disconnected；
(b23) exchange side incoming switch is disconnected；
(24) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a24) voltage source converter that locking inversion converter station need to exit；
(b24) it is closed DC side parallel bypass circuit；
(25) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, and two
Divide the operation order of content in no particular order:
(a25) DC side isolation switch is disconnected；
(b25) exchange side incoming switch is disconnected；
(26) control rectification converter station reduces Trigger Angle, and control inversion converter station increases DC voltage to specified, restores mixed
Close the operation power of DC transmission system.
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, control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly galvanic electricity pressure drop down to allowing to change
Stream device refers to the DC current control by Hybrid HVDC system to lower than electric current threshold in the range of exiting, direct current is voltage-controlled
It makes lower than voltage threshold；The electric current threshold value range is 0~0.05pu, and wherein 1pu is rated direct current；Voltage door
Sill value range is 0~0.2pu, and wherein 1pu is rated direct voltage.
The beneficial effects of the present invention are:
The configuration of the present invention is simple, it is easy to operate, it can be effectively solved the problem that mixing inverter exits online, realize string
Connection VSC inverter exits online, reduces ac and dc current impact when exiting, preferably protects the safety of each equipment.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure made by bright specification and accompanying drawing content perhaps equivalent process transformation or be directly or indirectly used in other correlation
Technical field, be included within the scope of the present invention.
Claims (13)
1. a kind of Hybrid HVDC Cascade System inverter extractor, 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 series connection inverter extractor for exiting series connection inverter, including acquisition unit, judgement unit, control list online
Member, in which:
The acquisition unit, for acquiring the DC voltage of Hybrid HVDC system, DC current, DC fields switch tool
Location status, inverter exit enabling signal；
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；
Described control unit, for detecting that Hybrid HVDC system needs to carry out inverter and exits behaviour in the judgement unit
When making, the thyristor transverter that control rectification converter station need to exit closes DC side parallel bypass cock, is latched the crystalline substance that need to be exited
Brake tube inverter disconnects DC side isolation switch, disconnects exchange side incoming switch；The voltage source that control inversion converter station need to exit
Type inverter is closed DC side parallel bypass circuit, is latched the voltage source converter that need to be exited, and disconnects DC side isolation switch,
Disconnect exchange side incoming switch；Finally restore the operation power of Hybrid HVDC system.
2. a kind of Hybrid HVDC Cascade System inverter extractor according to claim 1, which is characterized in that institute
Control unit is stated, detects that Hybrid HVDC system needs to carry out specifically to hold when inverter exits operation in the judgement unit
Row following steps:
(1) control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly what galvanic electricity pressure drop was exited down to permission inverter
In range；
(2) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a2) voltage source converter that locking inversion converter station need to exit；
(b2) it is closed DC side parallel bypass circuit；
(3) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a3) DC side isolation switch is disconnected；
(b3) exchange side incoming switch is disconnected；
(4) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a4) it is closed DC side parallel bypass cock；
(b4) thyristor transverter that locking rectification converter station need to exit；
(5) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a5) DC side isolation switch is disconnected；
(b5) exchange side incoming switch is disconnected；
(6) it controls rectification converter station and reduces Trigger Angle, control inversion converter station increases DC voltage to specified, recovery mixed DC
The operation power of transmission system.
3. a kind of Hybrid HVDC Cascade System inverter extractor according to claim 1, which is characterized in that institute
Control unit is stated, detects that Hybrid HVDC system needs to carry out specifically to hold when inverter exits operation in the judgement unit
Row following steps:
(21) control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly what galvanic electricity pressure drop was exited down to permission inverter
In range；
(22) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a22) it is closed DC side parallel bypass cock；
(b22) thyristor transverter that locking rectification converter station need to exit；
(23) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a23) DC side isolation switch is disconnected；
(b23) exchange side incoming switch is disconnected；
(24) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a24) voltage source converter that locking inversion converter station need to exit；
(b24) it is closed DC side parallel bypass circuit；
(25) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a25) DC side isolation switch is disconnected；
(b25) exchange side incoming switch is disconnected；
(26) control rectification converter station reduces Trigger Angle, and control inversion converter station increases DC voltage to specified, it is straight to restore mixing
Flow the operation power of transmission system.
4. a kind of Hybrid HVDC Cascade System inverter extractor 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 Hybrid HVDC Cascade System inverter extractor according to claim 1, which is characterized in that
The enabling signal that the inverter exits is triggered by operations staff or is triggered by fault-signal.
6. a kind of Hybrid HVDC Cascade System inverter extractor according to claim 2 or 3, feature exist
In,
The control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly what galvanic electricity pressure drop was exited down to permission inverter
Refer to that by the DC current control of Hybrid HVDC system, DC voltage control is to lower than electricity to lower than electric current threshold in range
Pressure gate sill.
7. a kind of Hybrid HVDC Cascade System inverter extractor according to claim 6, which is characterized in that institute
Stating electric current threshold value range is 0~0.05pu, and wherein 1pu is rated direct current；Voltage threshold value range be 0~
0.2pu, wherein 1pu is rated direct voltage.
8. a kind of Hybrid HVDC Cascade System inverter exits method, 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；
It is the control when detecting that Hybrid HVDC system needs to carry out inverter to exit operation that the inverter, which exits method,
The thyristor transverter that rectification converter station need to exit closes DC side parallel bypass cock, is latched the thyristor converter that need to be exited
Device disconnects DC side isolation switch, disconnects exchange side incoming switch；The voltage source converter that control inversion converter station need to exit
It is closed DC side parallel bypass circuit, is latched the voltage source converter that need to be exited, disconnects DC side isolation switch, disconnects exchange
Side incoming switch；Finally restore the operation power of Hybrid HVDC system.
9. a kind of troubleshooting side of Hybrid HVDC Cascade System inverter extractor according to claim 8
Method, which is characterized in that the inverter exits method and specifically comprises the following steps:
(1) control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly what galvanic electricity pressure drop was exited down to permission inverter
In range；
(2) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a2) voltage source converter that locking inversion converter station need to exit；
(b2) it is closed DC side parallel bypass circuit；
(3) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a3) DC side isolation switch is disconnected；
(b3) exchange side incoming switch is disconnected；
(4) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a4) it is closed DC side parallel bypass cock；
(b4) thyristor transverter that locking rectification converter station need to exit；
(5) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a5) DC side isolation switch is disconnected；
(b5) exchange side incoming switch is disconnected；
(6) it controls rectification converter station and reduces Trigger Angle, control inversion converter station increases DC voltage to specified, recovery mixed DC
The operation power of transmission system.
10. a kind of troubleshooting side of Hybrid HVDC Cascade System inverter extractor according to claim 8
Method, which is characterized in that the inverter exits method and specifically comprises the following steps:
(21) control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly what galvanic electricity pressure drop was exited down to permission inverter
In range；
(22) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a22) it is closed DC side parallel bypass cock；
(b22) thyristor transverter that locking rectification converter station need to exit；
(23) thyristor transverter that control rectification converter station need to exit carries out the operation of following two parts content, two parts content
Operation order in no particular order:
(a23) DC side isolation switch is disconnected；
(b23) exchange side incoming switch is disconnected；
(24) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a24) voltage source converter that locking inversion converter station need to exit；
(b24) it is closed DC side parallel bypass circuit；
(25) voltage source converter that need to exit of control inversion converter station carries out the operation of following two parts content, in two parts
The operation order of appearance is in no particular order:
(a25) DC side isolation switch is disconnected；
(b25) exchange side incoming switch is disconnected；
(26) control rectification converter station reduces Trigger Angle, and control inversion converter station increases DC voltage to specified, it is straight to restore mixing
Flow the operation power of transmission system.
11. a kind of troubleshooting side of Hybrid HVDC Cascade System inverter extractor according to claim 8
Method, which is characterized in that 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.
12. a kind of Hybrid HVDC Cascade System inverter according to claim 9 or 10 exits method, feature exists
In,
The control rectification converter station increases Trigger Angle, and the control inversion change of current stands erectly what galvanic electricity pressure drop was exited down to permission inverter
Refer to that by the DC current control of Hybrid HVDC system, DC voltage control is to lower than electricity to lower than electric current threshold in range
Pressure gate sill.
13. a kind of Hybrid HVDC Cascade System inverter according to claim 12 exits method, which is characterized in that
The electric current threshold value range is 0~0.05pu, and wherein 1pu is rated direct current；Voltage threshold value range be 0~
0.2pu, wherein 1pu is rated direct voltage.
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| CN201811405436.3A CN109361213B (en) | 2018-11-23 | 2018-11-23 | Withdrawal device and method for series converter of hybrid direct-current power transmission system |
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| CN201811405436.3A CN109361213B (en) | 2018-11-23 | 2018-11-23 | Withdrawal device and method for series converter of hybrid direct-current power transmission system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109802424A (en) * | 2019-03-08 | 2019-05-24 | 南京南瑞继保电气有限公司 | A kind of Hybrid HVDC system inverter investment cooperation method and device |
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| CN111600323B (en) * | 2020-04-27 | 2022-07-22 | 南京南瑞继保电气有限公司 | Hybrid cascade direct-current power transmission system coordination control method and system |
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