CN108258664A - A kind of Hybrid HVDC system failure processing unit and fault handling method - Google Patents
A kind of Hybrid HVDC system failure processing unit and fault handling method Download PDFInfo
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- CN108258664A CN108258664A CN201810010419.3A CN201810010419A CN108258664A CN 108258664 A CN108258664 A CN 108258664A CN 201810010419 A CN201810010419 A CN 201810010419A CN 108258664 A CN108258664 A CN 108258664A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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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- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Direct Current Feeding And Distribution (AREA)
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- Inverter Devices (AREA)
Abstract
The present invention discloses a kind of Hybrid HVDC system failure processing unit, including collecting unit, fault distinguishing unit and fault processing unit.Invention additionally discloses a kind of Hybrid HVDC system failure processing method, DC voltage, DC current, inversion current conversion station and the rectification current conversion station of acquisition Hybrid HVDC system connect the submodule capacitor voltage of voltage source converter in the alternating voltage and rectification current conversion station of AC network；Differentiate whether Hybrid HVDC system breaks down；If breaking down, rectification current conversion station switching DC current command value and/or DC voltage command value, control inversion current conversion station handover trigger angle command value are controlled.The direct current transmission line fault of Hybrid HVDC system can be effectively treated in such technical solution in the case where transverter is not latched; reliably through fault; and it can realize that quick dc power is restored after failure vanishes; the stabilization of AC/DC Power System is preferably maintained, protects the safety of AC/DC Power System.
Description
Technical field
The invention belongs to Hybrid HVDC field, more particularly to a kind of Hybrid HVDC system failure processing unit and
Fault handling method.
Background technology
HVDC transmission system can be divided into two types：Customary DC transmission system (LCC- based on thyristor technology
) and the flexible direct current power transmission system based on all-controlling power electronics device technology (Flexible-HVDC) HVDC.Wherein, it is conventional
DC transmission system (LCC-HVDC) is at low cost, loss is small, running technology is ripe, and at present, the direct current being currently running in the world is defeated
Electric system is nearly all LCC-HVDC systems, but there are inverter sides that commutation easily occurs for customary DC transmission system (LCC-HVDC)
The shortcomings of failure, a large amount of idle, current conversion stations of absorption strong to the dependence of AC system take up a large area.And the flexibility of a new generation
DC transmission system (Flexible-HVDC) can then realize active power and reactive power decoupling control, can be to passive net
Network power supply, compact-sized floor space be small, there is no the advantages that inverter side commutation failure problem, but its there are with high costs, damages
Consume the defects of larger.
Therefore there will be good engineering with reference to the Hybrid HVDC system of customary DC transmission of electricity and flexible DC power transmission
Application prospect.The topological structure of Hybrid HVDC system is mainly just like the mixing two of symmetrical monopolar wiring shown in FIG. 1 at present
Hold DC transmission system and the mixing two-terminal direct current transmission system of symmetrical bipolar wiring shown in Fig. 2.Both systems combine
Customary DC transmission losses is small, running technology is ripe and flexible DC power transmission can be powered to passive network, will not be changed
Mutually the advantages of failure.
But the Hybrid HVDC system in Fig. 1 and Fig. 2, when since insulation reduces flashover or tree occur for DC power transmission line
When branch collision causes earth fault, straight-flow system will form short circuit in short-term, and active power cannot be output to exchange side, and generate huge
Big direct fault current needs quickly to take measures on customs clearance at this time, in order to avoid jeopardize related DC equipment safety.
In the prior art, the customary DC transmission system based on thyristor technology, when DC power transmission line breaks down,
Rectification side transverter is after judging that DC line breaks down, phase shift immediately to maximum angle, is transferred to inverter operation state pumping
It takes the fault energy of DC side and cuts off direct fault current, inverter side transverter passes through interior communication or the fault distinguishing of oneself
Unit is determined after DC line breaks down, and is continued to inverter operation, is extracted DC side fault energy.In DC line event
After barrier disappears, rectification side transverter reduces Trigger Angle immediately, restores the power of straight-flow system.And based on full-control type power electronic device
The flexible direct current power transmission system of part technology, when DC power transmission line breaks down, the capacitance that is included by transverter is put
Electro ultrafiltration, at this time DC side will generate more huge fault current, rectification and inversion both sides transverter are judging AC line
Road is latched immediately after breaking down and tripping simultaneously joins exchange side breaker, tripping DC side disconnecting link, to cut off DC Line Fault
Electric current.After DC line fault disappearance, rectification and inversion both sides transverter will first close DC side disconnecting link, then close again
Exchange side breaker finally restores the power of straight-flow system into line precharge, such whole system to restart recovery time longer,
Usually second grade is unfavorable for the transient stability of AC/DC Power System.Since Hybrid HVDC system at least one end is using electricity
Potential source type transverter, one end uses thyristor converter device, therefore Hybrid HVDC system is in direct current transmission line fault, and one
As thyristor converter device use customary DC transmission system processing method, voltage source converter use flexible DC power transmission system
The processing method of system, therefore entire Hybrid HVDC system restarts that recovery time is also longer, and usually second grade, is unfavorable for handing over
The transient stability of DC transmission system.
Invention content
The purpose of the present invention is to provide a kind of Hybrid HVDC system failure processing unit and fault handling method,
The direct current transmission line fault of Hybrid HVDC system can be effectively treated in the case where transverter is not latched, reliably wear
More failure, and can realize that quick dc power is restored after failure vanishes, the stabilization of AC/DC Power System is preferably maintained,
Protect the safety of AC/DC Power System.
In order to achieve the above objectives, solution of the invention is：
A kind of Hybrid HVDC system failure processing unit, the Hybrid HVDC system include connecting sending end
The rectification current conversion station of AC network, for the inversion current conversion station that connects receiving end AC network and for connect rectification current conversion station and
The DC power transmission line of inversion current conversion station, the rectification current conversion station includes at least one set of voltage source converter unit, described inverse
Transform stream station includes at least one set of thyristor converter device unit；The fault treating apparatus includes：
Collecting unit, for acquiring the DC voltage of Hybrid HVDC system, DC current, inversion current conversion station and rectification
Current conversion station connects the submodule capacitor voltage of voltage source converter in the alternating voltage and rectification current conversion station of AC network；
Fault distinguishing unit, for the condition adjudgement Hybrid HVDC of relevant mode analog quantity acquired according to collecting unit
Whether system breaks down；And
Fault processing unit, for when the fault distinguishing unit detects Hybrid HVDC system jam,
Control rectification current conversion station switching DC current command value and/or DC voltage command value, control inversion current conversion station handover trigger angle
Command value；
The fault processing unit is additionally operable to, when being reached when the blow-out time to be set, control rectification current conversion station switching
DC current command value and/or DC voltage command value, control inversion current conversion station handover trigger angle command value, attempt to restore direct current
Power.
The Hybrid HVDC system dc electric current of above-mentioned collecting unit acquisition is not more than the current ration Iref1 of setting,
And when blow-out to be set have not timed out up to when, fault processing unit control rectification current conversion station switching DC current is notified to refer to
Value and/or DC voltage command value are enabled, the value range of Iref1 is 0~0.1pu.
Whether the Hybrid HVDC system that rectification current conversion station and inversion current conversion station independently detects breaks down or whole
Whether stream current conversion station is broken down with inversion current conversion station by the common detection Hybrid HVDC system that communicates.
When fault distinguishing unit judges Hybrid HVDC system jam, the DC voltage of rectification current conversion station generation
And/or the alternating current of output changes.
The DC voltage and/or the alternating current of output that above-mentioned rectification current conversion station generates specifically are changed into：Troubleshooting
Unit control rectification current conversion station is defeated to change according to the virtual value dynamic change alternating current instruction of the ac bus voltage of actual measurement
The alternating current gone out；Control rectification current conversion station adjusts the total number and input of modularization multi-level converter input submodule in real time
The polarity of submodule output level to survey DC current no more than Iref2 to change the size of DC voltage, and Iref2's takes
It is worth ranging from 0~0.1pu.
Relevant mode analog quantity of the above-mentioned fault distinguishing unit according to collecting unit acquisition after failure generation further judges event
Whether barrier disappears.
When failure vanishes, the power of fault processing unit control inversion current conversion station conveying restore the power to failure or
K1 times of power before failure, the alternating current of the DC voltage that rectification current conversion station generates and output restore the level to failure or
K2 times before failure, the value range of k1 and k2 are 0~1.
A kind of Hybrid HVDC system failure processing method, includes the following steps：
Step 1, DC voltage, DC current, inversion current conversion station and the rectification current conversion station of Hybrid HVDC system are acquired
The submodule capacitor voltage of voltage source converter in the alternating voltage of connected AC network and rectification current conversion station；
Step 2, the analog quantity acquired according to step 1 differentiates whether Hybrid HVDC system breaks down；
Step 3, if breaking down, rectification current conversion station switching DC current command value and/or DC voltage instruction are controlled
Value, control inversion current conversion station handover trigger angle command value；When being reached when the blow-out time to be set, control rectification current conversion station is cut
DC current command value and/or DC voltage command value are changed, control inversion current conversion station handover trigger angle command value is attempted to restore straight
Flow power.
When failure vanishes, then the power of inversion current conversion station conveying restores the k1 of power before the power to failure or failure
Times, the DC voltage and the alternating current of output that rectification current conversion station generates restore the level to failure or k2 times before failure,
The value range of k1 and k2 is 0~1.
In above-mentioned steps 2, when fault distinguishing unit judges Hybrid HVDC system jam：Rectification current conversion station produces
Raw DC voltage and/or the alternating current of output change, and specifically change into：The fault processing unit controls rectification
Current conversion station changes alternating current instruction to change the alternating current of output according to the virtual value dynamic of the ac bus voltage of actual measurement；
Control rectification current conversion station adjusts the total number of modularization multi-level converter input submodule and input submodule output electricity in real time
Flat polarity to survey DC current no more than Iref2 to change the size of DC voltage, the value range of Iref2 for 0~
0.1pu。
After using the above scheme, the beneficial effects of the invention are as follows：
(1) DC power transmission line short trouble in Hybrid HVDC system can be effectively treated in the present invention, prevent direct current
Equipment overcurrent reliably smoothly passes through DC line fault, preferably protects equipment safety；
(2) the configuration of the present invention is simple, it is easy to operate, both sides transverter can be maintained not when DC line breaks down
Locking, still to connect AC system offer reactive power support, effectively prevent rectification current conversion station during DC line fault simultaneously
Active power conveying and reactive power support are lost, maintains the stabilization for connecting AC system voltage；
(3) direct current transportation of Hybrid HVDC system can be effectively treated in the present invention in the case where transverter is not latched
Line fault, and the fast quick-recovery of dc power can be realized after a failure, preferably protect the safety of AC/DC Power System.
Description of the drawings
Fig. 1 is the mixing two-terminal direct current transmission system schematic diagram of symmetrical monopolar wiring；
Fig. 2 is the mixing two-terminal direct current transmission system schematic diagram of symmetrical bipolar wiring；
Fig. 3 is a kind of structure diagram of Hybrid HVDC system failure processing unit of the present invention；
Fig. 4 is a kind of flow chart of Hybrid HVDC system failure processing method of the present invention；
Fig. 5 is the three end DC transmission system schematic diagram of mixing of symmetrical monopolar wiring, wherein containing there are two be based on thyristor
The inversion current conversion station of transverter, 1 rectification current conversion station based on voltage source converter；
Fig. 6 is the three end DC transmission system schematic diagram of mixing of symmetrical bipolar wiring, wherein containing there are two be based on thyristor
The inversion current conversion station of transverter, 1 rectification current conversion station based on voltage source converter.
Specific embodiment
Below with reference to attached drawing, technical scheme of the present invention and advantageous effect are described in detail.
The present invention provides a kind of Hybrid HVDC system failure processing unit, wherein, the Hybrid HVDC system
Including being used to connecting the rectification current conversion station of sending end AC network, for connecting the inversion current conversion station of receiving end AC network and be used for
The DC power transmission line of rectification current conversion station and inversion current conversion station is connected, inversion current conversion station connects receiving end alternating current by transformer
Net, the rectification current conversion station include at least one set of voltage source converter unit, and the inversion current conversion station includes at least one set of brilliant
Brake tube inverter unit.
Rectification current conversion station uses the voltage source converter based on all-controlling power electronics device, forms the voltage-source type change of current
The submodule of device bridge arm is one or more of：Semi-bridge type, bridge-type, class bridge-type, clamp Shuangzi modular type, and form son
The switching device of module is full-controlled switch device, such as IGBT, IGCT, IEGT or GTO.Inversion current conversion station is used based on brilliant lock
The transverter of tube device, thyristor converter device can be six pulsation bridge circuits, 12 pulsation bridge circuits or double 12 arteries and veins
Dynamic bridge circuit.
The mixing two-terminal direct current transmission system of symmetrical monopolar wiring shown in FIG. 1 and symmetrical bipolar wiring shown in Fig. 2
It is relatively common Hybrid HVDC system to mix two-terminal direct current transmission system, and the present invention is suitable for as depicted in figs. 1 and 2
Hybrid HVDC system, but both transmission systems are not limited to, the three end direct current of mixing of symmetrical monopolar wiring as shown in Figure 5
Transmission system and the three end DC transmission system of mixing of symmetrical bipolar wiring shown in fig. 6 are also applied for the present invention, and the present invention is suitable
For all rectification sides there are voltage source converter, there are the Hybrid HVDC systems of thyristor converter device for inverter side.
It is illustrated below using Fig. 2 as specific embodiment.
As shown in Fig. 2, Hybrid HVDC system includes：Rectification current conversion station and inversion current conversion station, the two are straight by two
Stream transmission line of electricity is connected, wherein：Rectification current conversion station is used to after the three-phase alternating current of sending end AC network is converted to direct current lead to
It crosses DC power transmission line and sends inversion current conversion station to, passive filter can be connected on the busbar that sending end AC network enters the station,
May not have, need to be determined according to system engineering condition.Rectification current conversion station is composed in series by two groups of voltage source converters, string
Interlink point connects earthing pole, and voltage source converter is handed over by two-winding transformer of the mode of connection for Y0/ Δs with sending end
Galvanic electricity net connects, and AC circuit breaker is installed with respectively in transformer primary side, voltage source converter using determine DC voltage with
Determine the control of alternating voltage control strategy.
Inversion current conversion station is used to be conveyed to receiving end AC network after direct current is converted to three-phase alternating current, when receiving end is by crystalline substance
When brake tube transverter forms, installing passive filter is generally required, also needs to installing reactive-load compensation capacitor sometimes.It is inverse in Fig. 2
Transform stream station is composed in series by two groups of thyristor converter device units, series connection node connection earthing pole, the positive and negative both ends after series connection
It is connected by smoothing reactor with DC power transmission line；DC filtering is installed between DC line and the earth simultaneously
Device.
Thyristor converter device unit is using 12 pulsation bridge circuits；Wherein, each bridge arm is by several thyristor strings
Connection is formed, and thyristor converter device uses constant DC current control policy control.Thyristor converter device passes through a mode of connection point
Not Wei the three-winding transformers of Y0/Y/ Δs connect with receiving end AC network, and transformer primary side is installed with alternating current interruption respectively
Device.Transformer can carry out voltage class transformation to the three-phase alternating current of receiving end AC system, to adapt to required DC voltage
Grade, the transformer secondary mode of connection be not all 12 pulsation bridge-type thyristor converter devices two six pulse conversion bridges up and down
The three-phase alternating current that phase angle difference is 30 ° is provided, to reduce the harmonic current for flowing into power grid.
As shown in figure 3, fault treating apparatus include collecting unit, fault distinguishing unit and fault processing unit, below it is right
Each unit is described in detail：
The collecting unit be used to acquiring the DC voltage of Hybrid HVDC system, DC current, rectification current conversion station and
Inversion current conversion station connects the submodule capacitance of voltage source converter in the alternating voltage and rectification current conversion station of AC network
Voltage；
The fault distinguishing unit is used for the condition adjudgement mixed DC of relevant mode analog quantity acquired according to collecting unit
Whether transmission system breaks down；
The fault processing unit, for detecting Hybrid HVDC system jam in the fault distinguishing unit
When, control rectification current conversion station switches DC current command value and/or DC voltage command value, controls inversion current conversion station handover trigger
Angle command value；
The fault processing unit is further used for, and when being reached when the blow-out time to be set, controls rectification current conversion station
Switch DC current command value and/or DC voltage command value, control inversion current conversion station handover trigger angle command value is attempted to restore
Dc power.
Further, in electric current of the Hybrid HVDC system dc electric current of collecting unit acquisition no more than setting
During definite value Iref1, and when blow-out to be set have not timed out up to when, fault processing unit control rectification current conversion station is notified to cut
DC current command value and/or DC voltage command value are changed, Iref1 value ranges are：0~0.1pu.
Wherein, rectification current conversion station can independently detect whether Hybrid HVDC system occurs event with inversion current conversion station
Whether barrier or rectification current conversion station are broken down with inversion current conversion station by the common detection Hybrid HVDC system that communicates.
Wherein, when following 4 conditions, at least one meets, fault distinguishing unit can differentiate Hybrid HVDC
System jam：
1) DC voltage is less than first voltage definite value Uset1, and the duration is more than the first detection time definite value Tset1；
2) DC current is more than the first current ration Iset1, and the duration is more than the second detection time definite value Tset2；
3) rate of change of DC voltage is less than first rate definite value DUset, and the duration is more than third detection time
Definite value Tset3；
4) rate of change of DC current is more than the second rate definite value DIset, and the duration is more than the 4th detection time
Definite value Tset4；
When fault distinguishing unit judges Hybrid HVDC system jam, the DC voltage of rectification current conversion station generation
And/or the alternating current of output changes.
Specially：
The virtual value dynamic of ac bus voltage of the fault processing unit control rectification current conversion station according to actual measurement changes
Alternating current instructs the alternating current to change output；Control rectification current conversion station adjusts modularization multi-level converter input in real time
The total number of submodule and the polarity of input submodule output level to survey DC current to change the size of DC voltage
No more than Iref2, Iref2 value ranges are：0~0.1pu.
Fault distinguishing unit failure generation after according to collecting unit acquisition the further failure judgement of relevant mode analog quantity be
No disappearance, when following conditions, at least one meets, fault distinguishing unit differentiates that the Hybrid HVDC system failure disappears：
A) error of the DC current instruction before DC current and failure is less than the second current ration Iset2, and when continuing
Between more than the 6th detection time definite value Tset6；
B) DC voltage is persistently more than tertiary voltage definite value Uset3, and the duration is more than the 7th detection time definite value
Tset7；
When failure vanishes, the power of fault processing unit control inversion current conversion station conveying restore the power to failure or
K1 times of power before failure, the alternating current of the DC voltage that rectification current conversion station generates and output restore the level to failure or
K2 times before failure, the value range of k1 and k2 are 0~1.
Wherein, the Tset1 to Tset8, Iset1 of different Hybrid HVDC systems, Iset2, Uset1, Uset3,
DUset and DIset values are different according to the difference of its circuit performance parameters, some value ranges presented below：
The value range of time definite value Tset1 to Tset8 is 0~1s, and DC current definite value Iset1's and Iset2 takes
It is worth ranging from KiTimes rated direct current, wherein 0<Ki≤ 3, the value range of DC voltage definite value Uset1 and Uset3 are Ku1Times
Rated direct voltage, wherein 0<Ku1The value range of≤1, DUset are -10pu/ms to -0.001pu/ms, the value model of DIset
It encloses for 0.001pu/ms to 5.0pu/ms.
The present invention also provides a kind of fault handling method of Hybrid HVDC system, as shown in figure 4, including following step
Suddenly：
Step 1, DC voltage, DC current, rectification current conversion station and the inversion current conversion station of Hybrid HVDC system are acquired
The submodule capacitor voltage of voltage source converter in the alternating voltage of connected AC network and rectification current conversion station；
Step 2, the analog quantity acquired according to step 1 differentiates whether Hybrid HVDC system breaks down；
Step 3, if breaking down, rectification current conversion station switching DC current command value and/or DC voltage instruction are controlled
Value, control inversion current conversion station handover trigger angle command value；When being reached when the blow-out time to be set, control rectification current conversion station is cut
DC current command value and/or DC voltage command value are changed, control inversion current conversion station handover trigger angle command value is attempted to restore straight
Flow power.
Wherein, when failure vanishes, then the power of inversion current conversion station conveying restores work(before the power to failure or failure
K1 times of rate, before the alternating current of the DC voltage that rectification current conversion station generates and output restores the level to failure or failure
K2 times, the value range of k1 and k2 are 0~1.
It is preferred that when fault distinguishing unit judges Hybrid HVDC system jam：Rectification current conversion station generates straight
Galvanic electricity is pressed and/or the alternating current of output changes, and is specifically changed into：The fault processing unit controls rectification current conversion station
The virtual value dynamic of ac bus voltage according to actual measurement changes alternating current instruction to change the alternating current of output；It controls whole
Stream current conversion station adjusts the total number of modularization multi-level converter input submodule and puts into the pole of submodule output level in real time
Property to change the size of DC voltage to survey DC current no more than Iref2, Iref2 value ranges are：0~0.1pu.
It is corresponding with Hybrid HVDC system failure processing unit, when following conditions, at least one meets,
Differentiate Hybrid HVDC system jam：
1) DC voltage is less than first voltage definite value Uset1, and the duration is more than the first detection time definite value Tset1；
2) DC current is more than the first current ration Iset1, and the duration is more than the second detection time definite value Tset2；
3) rate of change of DC voltage is less than first rate definite value DUset, and the duration is more than third detection time
Definite value Tset3；
4) rate of change of DC current is more than the second rate definite value DIset, and the duration is more than the 4th detection time
Definite value Tset4；
When at least one meets when following conditions, differentiate that the Hybrid HVDC system failure disappears：
A) error of the DC current instruction before DC current and failure is less than the second current ration Iset2, and when continuing
Between more than the 6th detection time definite value Tset6；
B) DC voltage is persistently more than tertiary voltage definite value Uset3, and the duration is more than the 7th detection time definite value
Tset7。
It is only described below with a specific embodiment of Hybrid HVDC system shown in Fig. 2, troubleshooting
Method is similar, repeats no more.
A DC voltage as shown in Figure 2 is the mixing two-terminal direct current transmission system of 500kV, at voltage source converter
In converting plant, thyristor-type transverter is in Inverter Station, and wherein voltage source converter uses the module based on full-bridge submodule
Change multilevel converter.In Hybrid HVDC system operation, when converting plant acquires and detects the variation of DC voltage
Rate is less than -580kv/ms, and the duration is more than 1ms, it is determined that DC power transmission line breaks down at this time, and by fault-signal
Inverter Station is given by the communication between two stations.After judgement DC power transmission line breaks down, fault processing unit controls immediately
Rectification current conversion station switches DC current command value and DC voltage command value as the command value under direct current transmission line fault, and leads to
It crosses the total number of adjustment modularization multi-level converter input submodule in real time and puts into the polarity of submodule output level to change
The size for becoming converting plant output DC voltage so that surveying DC current is less than 0.0001pu or maintains zero.Foundation simultaneously
The virtual value dynamic that the voltage source converter of actual measurement connects ac bus voltage changes alternating current instruction, and then change voltage
The alternating current of source type transverter output, while inversion current conversion station handover trigger angle is controlled to instruct to maximum and runs Trigger Angle, and
Still it is inverter operation state to maintain receiving end thyristor converter device, extracts DC side fault energy.When the blow-out for waiting for 250ms
Between when reaching, fault processing unit control converting plant switching DC current command value is the command value before DC line fault, directly
Stream voltage instruction value is switched to is risen to by certain slope the command value before DC line fault by 0, in the process, works as converting plant
It acquires and detects that the DC voltage of Hybrid HVDC system is more than 0.2 times of rated direct voltage value (i.e. 100kV), and holds
The continuous time is more than 10ms, then judges that direct current transmission line fault disappears, and this failure vanishes signal is passed through the communication between two stations
Inverter Station is given, after Inverter Station receives this failure vanishes signal, the thyristor converter device of Inverter Station is cancelled immediately to Trigger Angle
Intervene, and start to reduce Trigger Angle, the power of conveying is restored into the power level to failure, the voltage-source type change of current of converting plant
Device cancels the intervention to DC voltage and alternating current instruction immediately, and the DC voltage of generation and the alternating current of output are restored
Level before to failure.
If in the process, converting plant, which never has, detects that the DC voltage of Hybrid HVDC system is more than 0.2
Rated direct voltage (100kV) again, it is determined that direct current transmission line fault still has at this time, and fault-signal is passed through two
Inverter Station is given in communication between standing, and after Inverter Station receives this fault-signal, fault processing unit still maintains receiving end thyristor to change
It is maximum operation Trigger Angle that stream device, which is inverter operation state and keeps Trigger Angle instruction, extracts DC side fault energy；It is meanwhile whole
Stream station switching DC current command value and DC voltage command value are the command value under direct current transmission line fault, and are passed through in real time
Adjustment modularization multi-level converter puts into the total number of submodule and puts into the polarity of submodule output level to change direct current
The size of voltage so that surveying DC current is less than 0.0001pu or maintains zero.It is changed simultaneously according to the voltage-source type of actual measurement
The virtual value dynamic that stream device connects ac bus voltage changes alternating current instruction, and then changes voltage source converter output
Alternating current.250ms is again waited for blow-out, when reaching the blow-out time of waiting, fault processing unit control converting plant is cut
DC current command value is changed as the command value before DC line fault, DC voltage command value is switched to by 0 by certain slope liter
Command value (500kV) or 0.7 times of rated direct voltage value (350kV) before to DC line fault, in the process, when
Converting plant acquires and detects that the DC voltage of Hybrid HVDC system is more than 0.2 times of rated direct voltage (100kV), and
Duration is more than 10ms, then judges that direct current transmission line fault disappears, and this failure vanishes signal is passed through leading between two stations
Letter gives Inverter Station, and after Inverter Station receives this failure vanishes signal, the thyristor converter device of Inverter Station is cancelled immediately to Trigger Angle
Intervention, and start to reduce Trigger Angle, the power of conveying restored 0.7 of power before the power level to failure or failure
Times, the voltage source converter of converting plant cancels the intervention to DC voltage and alternating current instruction immediately, by the direct current of generation
Voltage and the alternating current of output restore 0.7 times horizontal before the level to failure or failure.
Above example is merely illustrative of the invention's technical idea, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (10)
1. a kind of Hybrid HVDC system failure processing unit, the Hybrid HVDC system includes handing over for connecting sending end
The rectification current conversion station of galvanic electricity net, for the inversion current conversion station that connects receiving end AC network and for connecting rectification current conversion station and inverse
The DC power transmission line at transform stream station, the rectification current conversion station include at least one set of voltage source converter unit, the inversion
Current conversion station includes at least one set of thyristor converter device unit；It is characterized in that, the fault treating apparatus includes：
Collecting unit, for acquiring the DC voltage of Hybrid HVDC system, DC current, inversion current conversion station and the rectification change of current
It stands the submodule capacitor voltage of voltage source converter in the alternating voltage of connected AC network and rectification current conversion station；
Fault distinguishing unit, for the condition adjudgement Hybrid HVDC system of relevant mode analog quantity acquired according to collecting unit
Whether break down；And
Fault processing unit, for when the fault distinguishing unit detects Hybrid HVDC system jam, controlling
Rectification current conversion station switches DC current command value and/or DC voltage command value, the instruction of control inversion current conversion station handover trigger angle
Value；
The fault processing unit is additionally operable to, when being reached when the blow-out time to be set, control rectification current conversion station switching direct current
Current instruction value and/or DC voltage command value, control inversion current conversion station handover trigger angle command value, attempt to restore direct current work(
Rate.
2. a kind of Hybrid HVDC system failure processing unit as described in claim 1, it is characterised in that：The acquisition is single
The Hybrid HVDC system dc electric current of member acquisition is not more than the current ration Iref1 of setting, and when blow-out to be set
Between when not reaching, notify the fault processing unit control rectification current conversion station switching DC current command value and/or DC voltage
Command value, the value range of Iref1 is 0~0.1pu.
3. a kind of Hybrid HVDC system failure processing unit as described in claim 1, it is characterised in that：Rectification current conversion station
Hybrid HVDC system is independently detected with inversion current conversion station whether to break down or rectification current conversion station and the inversion change of current
It stands by the way that whether the common detection Hybrid HVDC system of communication breaks down.
4. a kind of Hybrid HVDC system failure processing unit as described in claim 1, it is characterised in that：Work as fault distinguishing
During unit judges Hybrid HVDC system jam, DC voltage and/or the alternating current of output that rectification current conversion station generates
Stream changes.
5. a kind of Hybrid HVDC system failure processing unit as claimed in claim 4, it is characterised in that：The rectification is changed
The DC voltage and/or the alternating current of output that stream station generates specifically are changed into：Fault processing unit controls rectification current conversion station
The virtual value dynamic of ac bus voltage according to actual measurement changes alternating current instruction to change the alternating current of output；It controls whole
Stream current conversion station adjusts the total number of modularization multi-level converter input submodule and puts into the pole of submodule output level in real time
Property to change the size of DC voltage to survey DC current no more than Iref2, the value range of Iref2 is 0~0.1pu.
6. a kind of Hybrid HVDC system failure processing unit as described in claim 1, it is characterised in that：The failure is sentenced
Whether relevant mode analog quantity further failure judgement of the other unit according to collecting unit acquisition after failure generation disappears.
7. a kind of Hybrid HVDC system failure processing unit as claimed in claim 6, it is characterised in that：Work as failure vanishes
When, the power of fault processing unit control inversion current conversion station conveying restore k1 times of power before the power to failure or failure,
The DC voltage and the alternating current of output that rectification current conversion station generates restore the level to failure or k2 times before failure, k1 and
The value range of k2 is 0~1.
8. a kind of Hybrid HVDC system failure processing method, it is characterised in that include the following steps：
Step 1, DC voltage, DC current, inversion current conversion station and the rectification current conversion station of acquisition Hybrid HVDC system connect
Connect the submodule capacitor voltage of voltage source converter in the alternating voltage and rectification current conversion station of AC network；
Step 2, the analog quantity acquired according to step 1 differentiates whether Hybrid HVDC system breaks down；
Step 3, if breaking down, rectification current conversion station switching DC current command value and/or DC voltage command value, control are controlled
Inversion current conversion station handover trigger angle processed command value；When being reached when the blow-out time to be set, control rectification current conversion station switching is straight
Current instruction value and/or DC voltage command value are flowed, control inversion current conversion station handover trigger angle command value is attempted to restore direct current work(
Rate.
9. a kind of Hybrid HVDC system failure processing method as claimed in claim 8, it is characterised in that：Work as failure vanishes
When, then the power that inversion current conversion station conveys restores k1 times of power before the power to failure or failure, and rectification current conversion station generates
DC voltage and the alternating current of output restore the level to failure or k2 times before failure, the value range of k1 and k2 are
0~1.
10. a kind of Hybrid HVDC system failure processing method as claimed in claim 8, it is characterised in that：The step 2
In, when fault distinguishing unit judges Hybrid HVDC system jam：Rectification current conversion station generate DC voltage and/or
The alternating current of output changes, and specifically changes into：The fault processing unit control rectification current conversion station is according to actual measurement
The virtual value dynamic of ac bus voltage changes alternating current instruction to change the alternating current of output；Control rectification current conversion station real
When adjustment modularization multi-level converter input submodule total number and to put into the polarity of submodule output level straight to change
The size of galvanic electricity pressure to survey DC current no more than Iref2, and the value range of Iref2 is 0~0.1pu.
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