CN107681678A - A kind of commutation failure prevention method based on rectification side Trigger Angle emergent control - Google Patents

A kind of commutation failure prevention method based on rectification side Trigger Angle emergent control Download PDF

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CN107681678A
CN107681678A CN201710772714.8A CN201710772714A CN107681678A CN 107681678 A CN107681678 A CN 107681678A CN 201710772714 A CN201710772714 A CN 201710772714A CN 107681678 A CN107681678 A CN 107681678A
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rec2
rec1
fault
under
threshold value
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CN107681678B (en
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张振安
饶宇飞
姚伟
刘畅
李程昊
刘阳
方舟
王建波
田春笋
高泽
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Huazhong University of Science and Technology
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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Huazhong University of Science and Technology
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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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
    • 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]

Abstract

The invention discloses a kind of commutation failure prevention method based on rectification side Trigger Angle emergent control, according to the Analysis on Mechanism of commutation failure, on the premise of reasonable assumption, when straight-flow system primary parameter, control system and AC system voltage determine, whether commutation failure occurs relation corresponding with rectification side Trigger Angle and inverter side Trigger Angle existence anduniquess, and any coupled relation is not present with inverter side Trigger Angle in rectification side Trigger Angle, therefore after fault in ac transmission system, the possibility of commutation failure generation can be quickly reduced according to certain logical changes rectification side Trigger Angle；As a result of variable failure determination threshold value, variable inertia time constant, and it directly controls rectification side Trigger Angle, is not necessary to by PI controlling units, therefore has the advantages of response quickly；This method reduces commutation failure odds, maintains the safe and stable operation of alternating current-direct current combined hybrid system.

Description

A kind of commutation failure prevention method based on rectification side Trigger Angle emergent control
Technical field
The present invention relates to operation and control of electric power system technical field, more particularly to one kind are urgent based on rectification side Trigger Angle The commutation failure prevention method of control.
Background technology
China, which is just greatly developing, is adapted to the remote, HVDC Transmission Technology of large capacity transmission, with more and more direct currents Power transmission engineering puts into operation so that China's power network forms typical " tetanic weak friendship " structure, and commutation failure easily occurs.
Commutation failure is typically too small caused by caused converter valve blow-out angle after inverter side fault in ac transmission system, is changed The acute variation of DC current, voltage, power mutually can be unsuccessfully caused, AC system is had an immense impact on.Actual DC is transmitted electricity Engineering is often provided with commutation failure PREDICTIVE CONTROL module, to prevent the generation of commutation failure, but commutation failure PREDICTIVE CONTROL Action effect is limited.
At present on the basis of Traditional DC transmits electricity control system, the new method of some existing prevention commutation failures.Such as DC current PREDICTIVE CONTROL method.DC current PREDICTIVE CONTROL method is joined by reducing DC current after fault in ac transmission system is detected Value is examined, reaches the purpose of prevention commutation failure.However, while DC current PREDICTIVE CONTROL acts, DC control system is certainly The commutation failure PREDICTIVE CONTROL module of band can reduce inverter side Trigger Angle, and then DC current is had certain ascendant trend.Cause This, certain internal conflict relation be present in DC current PREDICTIVE CONTROL method and commutation failure PREDICTIVE CONTROL, when simultaneously using this two It can weaken mutual control effect within a bit of time after fault in ac transmission system generation during kind method, and then be presented as direct current Predictive current control action effect is slow；In addition, the Startup time of existing DC current PREDICTIVE CONTROL places one's entire reliance upon, commutation is lost PREDICTIVE CONTROL is lost, startup is slower, therefore the prevention to commutation failure is limited in one's ability.
The content of the invention
It is an object of the invention to provide a kind of commutation failure prevention method based on rectification side Trigger Angle emergent control, its mesh Be reduce commutation failure odds, maintain alternating current-direct current combined hybrid system safe and stable operation.
The technical solution adopted by the present invention is：
A kind of commutation failure prevention method based on rectification side Trigger Angle emergent control, comprises the following steps：
A：Connect the parameter and running situation of AC system according to DC transmission system and its both sides, set rectification side urgent Startup threshold value choice set of the delayed trigger control under unbalanced fault closes { Srec1(1)、Srec1(2)、Srec1(3), rectification side is set Startup threshold value choice set of the urgent delayed trigger control under symmetric fault closes { Srec2(1)、Srec2(2)、Srec2(3), and ensure Srec1(1)>Srec1(3)>Srec1(2)、Srec2(1)>Srec2(3)>Srec2(2)；
B：Connect the parameter and running situation of AC system according to DC transmission system and its both sides, unbalanced fault is set Lower Trigger Angle output inertia time constant selection set { Trec1(1)、Trec1(2)、Trec1(3), set Trigger Angle under symmetric fault defeated Go out inertia time constant selection set { Trec2(1)、Trec2(2)、Trec2(3), and ensure Trec1(2)>Trec1(3)>Trec1(1)、Trec2(2)> Trec2(3)>Trec2(1)；
C：Rectification side Trigger Angle α during input system normal operationnor；
D：Set in the urgent delayed trigger control system of rectification side, start threshold value under unbalanced fault and change signal Frec1Just It is worth for 0, starts threshold value under symmetric fault and change signal Frec2Initial value is 0；Delayed trigger enabling signal C under unbalanced faultrec1Just It is worth for 0, delayed trigger enabling signal C under symmetric faultrec2Initial value is 0, and Trigger Angle exports α under unbalanced faultrec1(1)With it is symmetrical Trigger Angle exports α under failurerec2(1)Initial value is 0, Trigger Angle output inertia time constant kt under unbalanced faultrec1Initial value is Trec1(1), Trigger Angle output inertia time constant kt under symmetric faultrec2Initial value is Trec2(1)；
E：Unbalanced fault detection instantaneous value in the commutation failure PREDICTIVE CONTROL module that input direct-current transmission system carries Udiff1, symmetric fault detection instantaneous value Udiff2, unbalanced fault detection sampled value Usdiff1, symmetric fault detection sampled value Usdiff2And DC voltage real-time measurement values Udc；
F：Change signal F according to threshold value is started under unbalanced faultrec1Change signal F with threshold value is started under symmetric faultrec2 Whether it is 0, judges that the urgent delayed trigger of rectification side controls the startup threshold value S under unbalanced faultrec1With under symmetric fault Startup threshold value Srec2Situation；
G：Instantaneous value U is detected according to unbalanced faultdiff1With the startup threshold value S under unbalanced faultrec1Situation, judge not Start threshold value under symmetric fault and change signal Frec1With delayed trigger enabling signal C under unbalanced faultrec1Value；According to symmetrical Fault detect instantaneous value Udiff2With the startup threshold value S under symmetric faultrec2Situation, judge that starting threshold value under symmetric fault changes letter Number Frec2With delayed trigger enabling signal C under symmetric faultrec2Value；
H：Calculate rectification side the first reference value alpha of Trigger Anglerec1(2)The reference value alpha of angle value second is triggered with rectification siderec2(2)；
H1：Trigger Angle α under unbalanced fault is calculated according to formula (1)rec1(0),
αrec1(0)=arccos ((1-Usdiff1)cosαnor)·k1Crec1(1)；
Trigger Angle α under symmetric fault is calculated according to formula (2)rec2(0),
αrec2(0)=arccos ((1-Usdiff2)cosαnor)·k2Crec2(2)；
Wherein k1、k2For nargin coefficient, must be set according to the actual parameter of the urgent delayed trigger control system of rectification side It is fixed；
H2：Trigger Angle under unbalanced fault is exported into α respectivelyrec1(0)α is exported with Trigger Angle under symmetric faultrec2(0)Pass through Gain is 1, Trigger Angle output inertia time constant kt under unbalanced faultrec1Inertia time is exported with Trigger Angle under symmetric fault Constant ktrec2First order inertial loop, obtain under unbalanced fault Trigger Angle and export αrec1(1)With Trigger Angle under symmetric fault αrec2(1), and update Trigger Angle output inertia time constant kt under symmetric faultrec1Inertial time is exported with Trigger Angle under symmetric fault Between constant ktrec2；
H3：α is exported to Trigger Angle under unbalanced fault respectivelyrec1(1)α is exported with Trigger Angle under symmetric faultrec2(1)Carry out Amplitude limit, obtain the reference value alpha of rectification side Trigger Angle firstrec1(2)The reference value alpha of angle value second is triggered with rectification siderec2(2)；
I：Take the reference value alpha of rectification side Trigger Angle firstrec1(2), the reference value alpha of rectification side Trigger Angle secondrec2(2)And direct current system The Trigger Angle reference value alpha of system Given current controller output itselfrec(0)Maximum as Trigger Angle reference value alpharec, export to direct current The triggering system of transmission of electricity；
J：Judge whether system is still being run, if then entering step (E), if not then control strategy terminates.
Unbalanced fault detection instantaneous value U in calculation procedure Ediff1, symmetric fault detection instantaneous value Udiff2, it is asymmetric Fault detect sampled value Usdiff1With symmetric fault detection sampled value Usdiff2；
Unbalanced fault detection instantaneous value Udiff1The order of severity of AC system unbalanced fault is characterized, its calculation formula For：
Udiff1=| UA+UB+UC| (3)
Wherein, UA、UB、UCFor change of current busbar voltage instantaneous value；
Symmetric fault detection instantaneous value Udiff2The order of severity of AC system symmetric fault is characterized, its calculation formula is：
Wherein, UA、UB、UCFor change of current busbar voltage instantaneous value；
By unbalanced fault detection instantaneous value Udiff1Maximum keeps 12ms, produces unbalanced fault detection sampled value Usdiff1, symmetric fault is detected into instantaneous value Udiff2Maximum keeps 12ms, produces symmetric fault detection sampled value Usdiff2。
In described step F the startup threshold value S under unbalanced fault is controlled on the urgent delayed trigger of rectification siderec1With Startup threshold value S under symmetric faultrec2Specific determination step be：
F1：Check that starting threshold value under unbalanced fault changes signal Frec1Whether it is 0, if so, then entering step F2, if not It is, then Srec1=Srec1(3)；
If starting threshold value under unbalanced fault changes signal Frec1It is not 0, has illustrated the urgent delayed trigger of nearest rectification side There is action, can cause that AC system voltage pulsation is larger in the presence of the controller, therefore make the startup under unbalanced fault Threshold value Srec1For a higher value Srec1(3), avoid the follow-up frequent movement of the urgent delayed trigger of rectification side；
F2：Check that starting threshold value under symmetric fault changes signal Frec2Whether it is 0, if then Srec1=Srec1(2)If not It is, then Srec1=Srec1(1)；
If starting threshold value under symmetric fault changes signal Frec2It is not 0, illustrates pair of the urgent delayed trigger of nearest rectification side Claim faulty component to act, can cause that AC system voltage pulsation is larger in the presence of the control, therefore make asymmetric event Startup threshold value S under barrierrec1For a higher value Srec1(1), avoid the frequent movement of the urgent delayed trigger of rectification side.
If starting threshold value under symmetric fault changes signal Frec2For 0, illustrate that nearest system has been at normal even running State, AC system voltage pulsation is smaller if etching system does not break down when this, therefore makes opening under unbalanced fault Dynamic threshold value Srec1For a relatively low value Srec1(2), the reaction sensitivity of control is improved, accelerates toggle speed；
F3：Check that starting threshold value under symmetric fault changes signal Frec2Whether it is 0, if then entering step F4, if it is not, Then Srec2=Srec2(3)；
If starting threshold value under symmetric fault changes signal Frec2It is not 0, illustrates that the urgent delayed trigger of nearest rectification side has Action, can make it that AC system voltage pulsation is larger, therefore make the startup threshold value under symmetric fault in the presence of the control Srec2For a higher value Srec2(3), avoid the follow-up frequent movement of the urgent delayed trigger of rectification side；
F4：Check that starting threshold value under unbalanced fault changes signal Frec1Whether it is 0, if then Srec2=Srec2(2)If not It is then Srec2=Srec2(1)；
If starting threshold value under unbalanced fault changes signal Frec1It is not 0, illustrates the urgent delayed trigger of nearest rectification side Unbalanced fault part has acted, and can cause that AC system voltage pulsation is larger in the presence of the control, therefore makes symmetrical Startup threshold value S under failurerec2For a higher value Srec2(1), avoid the frequent movement of the urgent delayed trigger of rectification side；
If starting threshold value under unbalanced fault changes signal Frec1For 0, illustrate that nearest system has been at normal steady fortune Capable state, AC system voltage pulsation is smaller if etching system does not break down when this, therefore makes opening under symmetric fault Dynamic threshold value Srec2For a relatively low value Srec2(2), the reaction sensitivity of control is improved, accelerates toggle speed.
Start threshold value in described step G under unbalanced fault and change signal Frec1Opened with delayed trigger under unbalanced fault Dynamic signal Crec1, start threshold value under symmetric fault and change signal Frec2Delayed trigger enabling signal C under symmetric faultrec2It is specific Calculation procedure：
G1：If unbalanced fault detection instantaneous value Udiff1More than the startup threshold value S under unbalanced faultrec1Then by asymmetry Start threshold value under failure and change signal Frec11 is set to, changes signal F by threshold value is started under unbalanced faultrec1Broadening 0.5s, will Delayed trigger enabling signal C under unbalanced faultrec11 is set to, by delayed trigger enabling signal C under unbalanced faultrec1Broadening 0.05s, if unbalanced fault detection instantaneous value Udiff1No more than the startup threshold value S under unbalanced faultrec1, and unbalanced fault Lower startup threshold value changes signal Frec1More than broadening section before, then it will start threshold value under unbalanced fault and change signal Frec1 It is set to 0；If unbalanced fault detection instantaneous value Udiff1No more than the startup threshold value S under unbalanced faultrec1, and unbalanced fault Lower delayed trigger enabling signal Crec1More than broadening section before, then by delayed trigger enabling signal C under unbalanced faultrec1 It is set to 0；
If unbalanced fault detection instantaneous value Udiff1More than the startup threshold value S under unbalanced faultrec1, explanation detects Unbalanced fault is, it is necessary to which rectification side Trigger Angle promptly increases；
G2：If symmetric fault detection instantaneous value Udiff2More than the startup threshold value S under symmetric faultrec2Then by under symmetric fault Start threshold value and change signal Frec21 is set to, changes signal F by threshold value is started under symmetric faultrec2Broadening 0.5s, by symmetric fault Lower delayed trigger enabling signal Crec21 is set to, by delayed trigger enabling signal C under symmetric faultrec2Broadening 0.05s, if symmetrical event Barrier detection instantaneous value Udiff2No more than the startup threshold value S under symmetric faultrec2, and start threshold value under symmetric fault and change signal Frec2More than broadening section before, then it will start threshold value under symmetric fault and change signal Frec2It is set to 0；If symmetric fault detects Instantaneous value Udiff2No more than the startup threshold value S under symmetric faultrec2, and delayed trigger enabling signal C under symmetric faultrec2Exceed Broadening section before, then by delayed trigger enabling signal C under symmetric faultrec2It is set to 0；
If symmetric fault detection instantaneous value Udiff2More than the startup threshold value S under symmetric faultrec2, illustrate to detect symmetrically Failure is, it is necessary to which rectification side Trigger Angle promptly increases；
Trigger Angle α under unbalanced fault in described step H2rec1(1)With Trigger Angle α under symmetric faultrec2(1)Specific meter Calculate Trigger Angle output inertia time constant kt under step, and symmetric faultrec1Inertia time is exported with Trigger Angle under symmetric fault Constant ktrec2Specific renewal step：
H2-1：Judge delayed trigger enabling signal C under unbalanced faultrec1Whether continuous 0.1s keeps 1, if so, then Into H2-2, otherwise unbalanced fault inertia time constant selection signal Trec1For 0；
H2-2：As delayed trigger enabling signal C under unbalanced faultrec1After continuous 0.1s keeps 1, DC voltage is judged Real-time measurement values UdcWhether 0.65pu is more than, if so, then unbalanced fault inertia time constant selection signal Trec1For 1, if not It is, then unbalanced fault inertia time constant selection signal Trec1For 0；
H2-3：Judge delayed trigger enabling signal C under symmetric faultrec2Whether continuous 0.1s keeps 1, if then entering H2-4, otherwise symmetric fault inertia time constant selection signal Trec2For 0；
H2-4：As delayed trigger enabling signal C under symmetric faultrec2After continuous 0.1s keeps 1, judge that direct current is compacted When measured value UdcWhether 0.65pu is more than, if so, then symmetric fault inertia time constant selection signal Trec2For 1, if it is not, then Symmetric fault inertia time constant selection signal Trec2For 0；
H2-5：Utilize Trec3=Trec1ORTrec2Obtain and recover inertia time constant selection signal Trec3, and inertia will be recovered Time constant selection signal Trec3Broadening 0.3s；
H2-6：Check and recover inertia time constant selection signal Trec3Whether it is 1, is touched if so, then putting under unbalanced fault Send out angle output inertia time constant ktrec1For Trec1(3), put Trigger Angle output inertia time constant kt under symmetric faultrec2For Trec2(3), otherwise ktrec1、ktrec2Keep constant, and enter step H2-7；
H2-7：Respectively by Trigger Angle α under unbalanced faultrec1(0)With Trigger Angle α under symmetric faultrec2(0)It is by gain 1, Trigger Angle output inertia time constant kt under unbalanced faultrec1Inertia time constant is exported with Trigger Angle under symmetric fault ktrec2First order inertial loop, obtain under unbalanced fault Trigger Angle and export αrec1(1)Exported with Trigger Angle under symmetric fault αrec2(1)；
H2-8：Compare Trigger Angle under unbalanced fault and export αrec1(1)With last round of αrec1(1)Calculated value, if asymmetric Trigger Angle exports α under failurerec1(1)Less than last round of αrec1(1)Calculated value, then put time constant ktrec1For Trec1(2)If Not less than last round of αrec1(1)Calculated value, then put time constant ktrec1For Trec1(1)；
H2-9：Compare Trigger Angle under symmetric fault and export αrec2(1)With last round of αrec2(1)Calculated value, if symmetric fault Lower Trigger Angle exports αrec2(1)Less than last round of αrec2(1)Calculated value, then put time constant ktrec2For Trec2(2)It is if not small In last round of αrec2(1)Calculated value, then put time constant ktrec2For Trec2(1)。
Beneficial effects of the present invention：
1st, reasonability：According to the Analysis on Mechanism of commutation failure, on the premise of reasonable assumption, when straight-flow system is once joined When number, control system and AC system voltage determine, whether commutation failure occurs and rectification side Trigger Angle and inverter side Trigger Angle Relation corresponding to existence anduniquess, and any coupled relation is not present with inverter side Trigger Angle in rectification side Trigger Angle, therefore exchange system After failure of uniting, the possibility of commutation failure generation can be quickly reduced according to certain logical changes rectification side Trigger Angle.
2nd, novelty：A kind of commutation failure prevention method based on rectification side Trigger Angle emergent control proposed by the present invention is still Have no document report.
3rd, rapidity：The whether effective key of commutation failure preventive means is the rapidity of its action.Changed with existing Mutually failure Control Measure is compared, a kind of commutation failure prevention based on rectification side Trigger Angle emergent control proposed by the present invention Method is as a result of variable failure determination threshold value, variable inertia time constant, and it directly controls rectification side Trigger Angle, is not necessary to By PI controlling units, therefore there is the advantages of response quickly.
4th, effect is good：A kind of commutation failure prevention method based on rectification side Trigger Angle emergent control proposed by the present invention and The DC current PREDICTIVE CONTROL that existing scholar proposes is compared, and further reduces the probability of DC transmission system commutation failure, Be advantageous to system safe and stable operation.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention；
Fig. 2 is the structural representation of DC transmission system；
Fig. 3 is that DC current PREDICTIVE CONTROL contrasts with the present invention in the case of single-phase fault to the preventive effect of commutation failure Figure；
Fig. 4 is that DC current PREDICTIVE CONTROL contrasts with the present invention in the case of three-phase fault to the preventive effect of commutation failure Figure.
Embodiment
As shown in figure 1, a kind of commutation failure prevention method of rectification side Trigger Angle emergent control, comprises the following steps：
A：Connect the parameter and running situation of AC system according to DC transmission system and its both sides, set rectification side urgent Startup threshold value choice set of the delayed trigger control under unbalanced fault closes { Srec1(1)、Srec1(2)、Srec1(3), rectification side is set Startup threshold value choice set of the urgent delayed trigger control under symmetric fault closes { Srec2(1)、Srec2(2)、Srec2(3), and ensure Srec1(1)>Srec1(3)>Srec1(2)、Srec2(1)>Srec2(3)>Srec2(2)；
Start threshold value choice set close must be connected according to DC transmission system and its both sides AC system parameter tested it is whole It is fixed, and ensure Srec1(1)>Srec1(3)>Srec1(2)、Srec2(1)>Srec2(3)>Srec2(2).Start threshold value choice set to close so that rectification side is tight The startup threshold value of anxious delayed trigger control method can change according to the difference of running situation, rectification side is promptly lagged Triggering control has different sensitivity under system difference running situation, so as to both ensure that the control is quick in the action Action, turn avoid frequent movement when should not act.
B：Connect the parameter and running situation of AC system according to DC transmission system and its both sides, unbalanced fault is set Lower Trigger Angle output inertia time constant selection set { Trec1(1)、Trec1(2)、Trec1(3), set Trigger Angle under symmetric fault defeated Go out inertia time constant selection set { Trec2(1)、Trec2(2)、Trec2(3), and ensure Trec1(2)>Trec1(3)>Trec1(1)、Trec2(2)> Trec2(3)>Trec2(1)；
Inertia time constant selection set must be according to DC transmission system and its parameter and operation feelings of connected AC system Condition is adjusted, and ensures Trec1(2)>Trec1(3)>Trec1(1)、Trec2(2)>Trec2(3)>Trec2(1).Inertia of design time constant selects The purpose of set is to make the final output of the urgent delayed trigger control of rectification side in the different phase of fault in ac transmission system have Different change speed degrees, both ensure that the quick acting of the control after fault in ac transmission system, after again failure being terminated Output quantity steadily declines, and reduces system power fluctuation.
C：Rectification side Trigger Angle α during input system normal operationnor；
D：Set in the urgent delayed trigger control system of rectification side, start threshold value under unbalanced fault and change signal Frec1Just It is worth for 0, starts threshold value under symmetric fault and change signal Frec2Initial value is 0；Delayed trigger enabling signal C under unbalanced faultrec1Just It is worth for 0, delayed trigger enabling signal C under symmetric faultrec2Initial value is 0, and Trigger Angle exports α under unbalanced faultrec1(1)With it is symmetrical Trigger Angle exports α under failurerec2(1)Initial value is 0, Trigger Angle output inertia time constant kt under unbalanced faultrec1Initial value is Trec1(1), Trigger Angle output inertia time constant kt under symmetric faultrec2Initial value is Trec2(1)；
E：Unbalanced fault detection instantaneous value in the commutation failure PREDICTIVE CONTROL module that input direct-current transmission system carries Udiff1, symmetric fault detection instantaneous value Udiff2, unbalanced fault detection sampled value Usdiff1, symmetric fault detection sampled value Usdiff2And DC voltage real-time measurement values Udc；
Unbalanced fault detection instantaneous value Udiff1The order of severity of AC system unbalanced fault is characterized, its calculation formula For：
Udiff1=| UA+UB+UC| (3)
Wherein, UA、UB、UCFor change of current busbar voltage instantaneous value；
Symmetric fault detection instantaneous value Udiff2The order of severity of AC system symmetric fault is characterized, its calculation formula is：
Wherein, UA、UB、UCFor change of current busbar voltage instantaneous value；
By unbalanced fault detection instantaneous value Udiff1Maximum keeps 12ms, produces unbalanced fault detection sampled value Usdiff1, symmetric fault is detected into instantaneous value Udiff2Maximum keeps 12ms, produces symmetric fault detection sampled value Usdiff2。
F：Change signal F according to threshold value is started under unbalanced faultrec1Change signal F with threshold value is started under symmetric faultrec2 Whether it is 0, judges that the urgent delayed trigger of rectification side controls the startup threshold value S under unbalanced faultrec1With under symmetric fault Startup threshold value Srec2Situation；
In described step F the startup threshold value S under unbalanced fault is controlled on the urgent delayed trigger of rectification siderec1With Startup threshold value S under symmetric faultrec2Specific determination step be：
F1：Check that starting threshold value under unbalanced fault changes signal Frec1Whether it is 0, if so, then entering step F2, if not It is, then Srec1=Srec1(3)；
If starting threshold value under unbalanced fault changes signal Frec1It is not 0, has illustrated the urgent delayed trigger of nearest rectification side There is action, can cause that AC system voltage pulsation is larger in the presence of the controller, therefore make the startup under unbalanced fault Threshold value Srec1For a higher value Srec1(3), avoid the follow-up frequent movement of the urgent delayed trigger of rectification side；
F2：Check that starting threshold value under symmetric fault changes signal Frec2Whether it is 0, if then Srec1=Srec1(2)If not It is, then Srec1=Srec1(1)；
If starting threshold value under symmetric fault changes signal Frec2It is not 0, illustrates pair of the urgent delayed trigger of nearest rectification side Claim faulty component to act, can cause that AC system voltage pulsation is larger in the presence of the control, therefore make asymmetric event Startup threshold value S under barrierrec1For a higher value Srec1(1), avoid the frequent movement of the urgent delayed trigger of rectification side.
If starting threshold value under symmetric fault changes signal Frec2For 0, illustrate that nearest system has been at normal even running State, AC system voltage pulsation is smaller if etching system does not break down when this, therefore makes opening under unbalanced fault Dynamic threshold value Srec1For a relatively low value Srec1(2), the reaction sensitivity of control is improved, accelerates toggle speed；
F3：Check that starting threshold value under symmetric fault changes signal Frec2Whether it is 0, if then entering step F4, if it is not, Then Srec2=Srec2(3)；
If starting threshold value under symmetric fault changes signal Frec2It is not 0, illustrates that the urgent delayed trigger of nearest rectification side has Action, can make it that AC system voltage pulsation is larger, therefore make the startup threshold value under symmetric fault in the presence of the control Srec2For a higher value Srec2(3), avoid the follow-up frequent movement of the urgent delayed trigger of rectification side；
F4：Check that starting threshold value under unbalanced fault changes signal Frec1Whether it is 0, if then Srec2=Srec2(2)If not It is then Srec2=Srec2(1)；
If starting threshold value under unbalanced fault changes signal Frec1It is not 0, illustrates the urgent delayed trigger of nearest rectification side Unbalanced fault part has acted, and can cause that AC system voltage pulsation is larger in the presence of the control, therefore makes symmetrical Startup threshold value S under failurerec2For a higher value Srec2(1), avoid the frequent movement of the urgent delayed trigger of rectification side；
If starting threshold value under unbalanced fault changes signal Frec1For 0, illustrate that nearest system has been at normal steady fortune Capable state, AC system voltage pulsation is smaller if etching system does not break down when this, therefore makes opening under symmetric fault Dynamic threshold value Srec2For a relatively low value Srec2(2), the reaction sensitivity of control is improved, accelerates toggle speed.
G：Instantaneous value U is detected according to unbalanced faultdiff1With the startup threshold value S under unbalanced faultrec1Situation, judge not Start threshold value under symmetric fault and change signal Frec1With delayed trigger enabling signal C under unbalanced faultrec1Value；According to symmetrical Fault detect instantaneous value Udiff2With the startup threshold value S under symmetric faultrec2Situation, judge that starting threshold value under symmetric fault changes letter Number Frec2With delayed trigger enabling signal C under symmetric faultrec2Value；
Start threshold value in described step G under unbalanced fault and change signal Frec1Opened with delayed trigger under unbalanced fault Dynamic signal Crec1, start threshold value under symmetric fault and change signal Frec2Delayed trigger enabling signal C under symmetric faultrec2It is specific Calculation procedure：
G1：If unbalanced fault detection instantaneous value Udiff1More than the startup threshold value S under unbalanced faultrec1Then by asymmetry Start threshold value under failure and change signal Frec11 is set to, changes signal F by threshold value is started under unbalanced faultrec1Broadening 0.5s, will Delayed trigger enabling signal C under unbalanced faultrec11 is set to, by delayed trigger enabling signal C under unbalanced faultrec1Broadening 0.05s, if unbalanced fault detection instantaneous value Udiff1No more than the startup threshold value S under unbalanced faultrec1, and unbalanced fault Lower startup threshold value changes signal Frec1More than broadening section before, then it will start threshold value under unbalanced fault and change signal Frec1 It is set to 0；If unbalanced fault detection instantaneous value Udiff1No more than the startup threshold value S under unbalanced faultrec1, and unbalanced fault Lower delayed trigger enabling signal Crec1More than broadening section before, then by delayed trigger enabling signal C under unbalanced faultrec1 It is set to 0；
If unbalanced fault detection instantaneous value Udiff1More than the startup threshold value S under unbalanced faultrec1, explanation detects Unbalanced fault is, it is necessary to which rectification side Trigger Angle promptly increases；
G2：If symmetric fault detection instantaneous value Udiff2More than the startup threshold value S under symmetric faultrec2Then by under symmetric fault Start threshold value and change signal Frec21 is set to, changes signal F by threshold value is started under symmetric faultrec2Broadening 0.5s, by symmetric fault Lower delayed trigger enabling signal Crec21 is set to, by delayed trigger enabling signal C under symmetric faultrec2Broadening 0.05s, if symmetrical event Barrier detection instantaneous value Udiff2No more than the startup threshold value S under symmetric faultrec2, and start threshold value under symmetric fault and change signal Frec2More than broadening section before, then it will start threshold value under symmetric fault and change signal Frec2It is set to 0；If symmetric fault detects Instantaneous value Udiff2No more than the startup threshold value S under symmetric faultrec2, and delayed trigger enabling signal C under symmetric faultrec2Exceed Broadening section before, then by delayed trigger enabling signal C under symmetric faultrec2It is set to 0；
If symmetric fault detection instantaneous value Udiff2More than the startup threshold value S under symmetric faultrec2, illustrate to detect symmetrically Failure is, it is necessary to which rectification side Trigger Angle promptly increases.
H：Calculate rectification side the first reference value alpha of Trigger Anglerec1(2)The reference value alpha of angle value second is triggered with rectification siderec2(2)；
H1：Trigger Angle α under unbalanced fault is calculated according to formula (1)rec1(0),
αrec1(0)=arccos ((1-Usdiff1)cosαnor)·k1Crec1(1)；
Trigger Angle α under symmetric fault is calculated according to formula (2)rec2(0),
αrec2(0)=arccos ((1-Usdiff2)cosαnor)·k2Crec2(2)；
Wherein k1、k2For nargin coefficient, must be set according to the actual parameter of the urgent delayed trigger control system of rectification side It is fixed；
According to the principle analysis of commutation failure, in the case of system three-phase symmetrical, it is assumed that fault moment occurs in commutation Before process, exist
Wherein, γ is blow-out angle, ULnFor inverter side change of current bus line voltage, ULzFor rectification side change of current bus line voltage, Rz、 RnRespectively rectification side and inverter side transverter equivalence commutating resistance, RLFor line resistance, αrecFor rectification side Trigger Angle, βinvFor Inverter side triggers angle of advance.
The basic reason of commutation failure is that blow-out angle γ is too small.In the case where systematic parameter is constant, if inverter side AC system short circuit causes ULnDecline, equal proportion improves cos αrecIt can play a part of preventing commutation failure.Udiff1And Udiff2 Characterize the decline degree of change of current busbar voltage, therefore available Udiff1And Udiff2Calculate rectification side Trigger Angle αrecChange value. k1、k2For the constant more than 1, its object is to the control effect for the device that tightens control；In the case of unbalanced fault, commutation electricity Press through zero point to shift to an earlier date, be less useful for commutation, therefore k2More than k1。
H2：Trigger Angle under unbalanced fault is exported into α respectivelyrec1(0)α is exported with Trigger Angle under symmetric faultrec2(0)Pass through Gain is 1, Trigger Angle output inertia time constant kt under unbalanced faultrec1Inertia time is exported with Trigger Angle under symmetric fault Constant ktrec2First order inertial loop, obtain under unbalanced fault Trigger Angle and export αrec1(1)With Trigger Angle under symmetric fault αrec2(1), and update Trigger Angle output inertia time constant kt under symmetric faultrec1Inertial time is exported with Trigger Angle under symmetric fault Between constant ktrec2；
Trigger Angle α under unbalanced fault in described step H2rec1(1)With Trigger Angle α under symmetric faultrec2(1)Specific meter Calculate Trigger Angle output inertia time constant kt under step, and symmetric faultrec1Inertia time is exported with Trigger Angle under symmetric fault Constant ktrec2Specific renewal step：
H2-1：Judge delayed trigger enabling signal C under unbalanced faultrec1Whether continuous 0.1s keeps 1, if so, then Into H2-2, otherwise unbalanced fault inertia time constant selection signal Trec1For 0；
H2-2：As delayed trigger enabling signal C under unbalanced faultrec1After continuous 0.1s keeps 1, DC voltage is judged Real-time measurement values UdcWhether 0.65pu is more than, if so, then unbalanced fault inertia time constant selection signal Trec1For 1, if not It is, then unbalanced fault inertia time constant selection signal Trec1For 0；
H2-3：Judge delayed trigger enabling signal C under symmetric faultrec2Whether continuous 0.1s keeps 1, if then entering H2-4, otherwise symmetric fault inertia time constant selection signal Trec2For 0；
H2-4：As delayed trigger enabling signal C under symmetric faultrec2After continuous 0.1s keeps 1, judge that direct current is compacted When measured value UdcWhether 0.65pu is more than, if so, then symmetric fault inertia time constant selection signal Trec2For 1, if it is not, then Symmetric fault inertia time constant selection signal Trec2For 0；
H2-5：Utilize Trec3=Trec1ORTrec2Obtain and recover inertia time constant selection signal Trec3, and inertia will be recovered Time constant selection signal Trec3Broadening 0.3s；
H2-6：Check and recover inertia time constant selection signal Trec3Whether it is 1, is touched if so, then putting under unbalanced fault Send out angle output inertia time constant ktrec1For Trec1(3), put Trigger Angle output inertia time constant kt under symmetric faultrec2For Trec2(3), otherwise ktrec1、ktrec2Keep constant, and enter step H2-7；
H2-7：Respectively by Trigger Angle α under unbalanced faultrec1(0)With Trigger Angle α under symmetric faultrec2(0)It is by gain 1, Trigger Angle output inertia time constant kt under unbalanced faultrec1Inertia time constant is exported with Trigger Angle under symmetric fault ktrec2First order inertial loop, obtain under unbalanced fault Trigger Angle and export αrec1(1)Exported with Trigger Angle under symmetric fault αrec2(1)；
H2-8：Compare Trigger Angle under unbalanced fault and export αrec1(1)With last round of αrec1(1)Calculated value, if asymmetric Trigger Angle exports α under failurerec1(1)Less than last round of αrec1(1)Calculated value, then put time constant ktrec1For Trec1(2)If Not less than last round of αrec1(1)Calculated value, then put time constant ktrec1For Trec1(1)；
H2-9：Compare Trigger Angle under symmetric fault and export αrec2(1)With last round of αrec2(1)Calculated value, if symmetric fault Lower Trigger Angle exports αrec2(1)Less than last round of αrec2(1)Calculated value, then put time constant ktrec2For Trec2(2)It is if not small In last round of αrec2(1)Calculated value, then put time constant ktrec2For Trec2(1)；
H3：α is exported to Trigger Angle under unbalanced fault respectivelyrec1(1)α is exported with Trigger Angle under symmetric faultrec2(1)Carry out Amplitude limit, obtain the reference value alpha of rectification side Trigger Angle firstrec1(2)The reference value alpha of angle value second is triggered with rectification siderec2(2)；
The purpose of step H1~H3 is to make αrec1(2)Or αrec2(2)Quick increase, is slowly reduced, and had both been played quick prevention commutation and has been lost The effect lost, it turn avoid the rapid fluctuation of follow-up time internal power；In addition, after if failure starts a period of time, DC voltage More than 0.65pu, illustrate now to be not susceptible to follow-up commutation failure, α can be acceleratedrec1(1)Or αrec2(1)Decline so that system Normal operating condition is returned to as early as possible.
I：Take the reference value alpha of rectification side Trigger Angle firstrec1(2), the reference value alpha of rectification side Trigger Angle secondrec2(2)And direct current system The Trigger Angle reference value alpha of system Given current controller output itselfrec(0)Maximum as Trigger Angle reference value alpharec, export to direct current The triggering system of transmission of electricity；
J：Judge whether system is still being run, if then entering step (E), if not then control strategy terminates.
It is pre- to the commutation failure of the present invention based on rectification side Trigger Angle emergent control with reference to specific embodiment Anti- method is described in detail.
Using PSCAD EMTDC emulation platforms, built in DC transmission system shown in Fig. 2 DC current PREDICTIVE CONTROL with Commutation failure prevention method proposed by the present invention based on rectification side Trigger Angle emergent control.In the model, rectification side and inverse It is 4 to become top-cross streaming system short-circuit ratio, and rectification side change of current bus rated line voltage virtual value is 345kV, inverter side change of current bus Rated line voltage virtual value is 230kV, rated direct voltage 500kV, rated direct current 2kA.Critical extinction angle γmin For 0.1745rad, rectification side Trigger Angle α during normal operationnorFor 0.16rad.
Each parameter setting of commutation failure prevention method based on rectification side Trigger Angle emergent control is as follows：Set {Srec1(1)、Srec1(2)、Srec1(3)}={ 0.03,0.015,0.02 }；{ S is setrec2(1)、Srec2(2)、Srec2(3)}={ 0.25, 0.045、0.15}；{ T is setrec1(1)、Trec1(2)、Trec1(3)}={ 0,0.1,0.06 }；{ T is setrec2(1)、Trec2(2)、Trec2(3)} ={ 0,0.1,0.06 }；α is setrec1(2)Amplitude limit up and down be respectively 0.77,0.088；α is setrec2(2)Amplitude limit up and down be respectively 0.77、0.088；K is set1=2, k2=1.1.
Set inverter side change of current bus that A phase ground short circuits are occurring at different moments through different grounded inductors, be respectively adopted straight Predictive current control and the commutation failure precautionary measures proposed by the present invention based on the urgent delayed trigger of rectification side are flowed, observe commutation Failure scenarios are as shown in Figure 3.As can be seen that in 400 groups of examples test of progress, during using DC current PREDICTIVE CONTROL, have 287 groups of examples use the commutation failure proposed by the present invention based on the urgent delayed trigger of rectification side pre- there occurs commutation failure During anti-measure, only 217 groups of examples are there occurs commutation failure, than reducing 24.39% during use DC current PREDICTIVE CONTROL Commutation failure possibility occurrence.
Set inverter side change of current bus that three-phase ground short circuit is occurring at different moments through different grounded inductors, be respectively adopted straight Predictive current control and the commutation failure precautionary measures proposed by the present invention based on the urgent delayed trigger of rectification side are flowed, observe commutation Failure scenarios are as shown in Figure 4.As can be seen that in 210 groups of examples test of progress, during using DC current PREDICTIVE CONTROL, have 125 groups of examples use the commutation failure proposed by the present invention based on the urgent delayed trigger of rectification side pre- there occurs commutation failure During anti-measure, only 96 groups of examples reduce there occurs commutation failure, during than using DC current PREDICTIVE CONTROL 23.20% and changed Mutually failure possibility occurrence.
Method proposed by the present invention can preferably prevent commutation failure, to maintaining AC-DC hybrid power grid safety and stability fortune Row serves certain effect.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：It is still Technical scheme described in previous embodiment can be modified, either which part or all technical characteristic are carried out etc. With replacement；And these modifications or replacement, the essence of appropriate technical solution is departed from technical scheme of the embodiment of the present invention Scope.

Claims (5)

  1. A kind of 1. commutation failure prevention method based on rectification side Trigger Angle emergent control, it is characterised in that：Comprise the following steps：
    A：Connect the parameter and running situation of AC system according to DC transmission system and its both sides, set rectification side promptly to lag Startup threshold value choice set of the triggering control under unbalanced fault closes { Srec1(1)、Srec1(2)、Srec1(3), set rectification side urgent Startup threshold value choice set of the delayed trigger control under symmetric fault closes { Srec2(1)、Srec2(2)、Srec2(3), and ensure Srec1(1)> Srec1(3)>Srec1(2)、Srec2(1)>Srec2(3)>Srec2(2)；
    B：Connect the parameter and running situation of AC system according to DC transmission system and its both sides, set and touched under unbalanced fault Send out angle output inertia time constant selection set { Trec1(1)、Trec1(2)、Trec1(3), set Trigger Angle output under symmetric fault used Property time constant selection set { Trec2(1)、Trec2(2)、Trec2(3), and ensure Trec1(2)>Trec1(3)>Trec1(1)、Trec2(2)> Trec2(3)>Trec2(1)；
    C：Rectification side Trigger Angle α during input system normal operationnor；
    D：Set in the urgent delayed trigger control system of rectification side, start threshold value under unbalanced fault and change signal Frec1Initial value is 0, start threshold value under symmetric fault and change signal Frec2Initial value is 0；Delayed trigger enabling signal C under unbalanced faultrec1Initial value is 0, delayed trigger enabling signal C under symmetric faultrec2Initial value is 0, and Trigger Angle exports α under unbalanced faultrec1(1)And symmetric fault Lower Trigger Angle exports αrec2(1)Initial value is 0, Trigger Angle output inertia time constant kt under unbalanced faultrec1Initial value is Trec1(1), Trigger Angle output inertia time constant kt under symmetric faultrec2Initial value is Trec2(1)；
    E：Unbalanced fault detection instantaneous value U in the commutation failure PREDICTIVE CONTROL module that input direct-current transmission system carriesdiff1、 Symmetric fault detection instantaneous value Udiff2, unbalanced fault detection sampled value Usdiff1, symmetric fault detection sampled value Usdiff2And DC voltage real-time measurement values Udc；
    F：Change signal F according to threshold value is started under unbalanced faultrec1Change signal F with threshold value is started under symmetric faultrec2Whether For 0, judge that the urgent delayed trigger of rectification side controls the startup threshold value S under unbalanced faultrec1With opening under symmetric fault Dynamic threshold value Srec2Situation；
    G：Instantaneous value U is detected according to unbalanced faultdiff1With the startup threshold value S under unbalanced faultrec1Situation, judge asymmetric Start threshold value under failure and change signal Frec1With delayed trigger enabling signal C under unbalanced faultrec1Value；According to symmetric fault Detect instantaneous value Udiff2With the startup threshold value S under symmetric faultrec2Situation, judge that starting threshold value under symmetric fault changes signal Frec2With delayed trigger enabling signal C under symmetric faultrec2Value；
    H：Calculate rectification side the first reference value alpha of Trigger Anglerec1(2)The reference value alpha of angle value second is triggered with rectification siderec2(2)；
    H1：Trigger Angle α under unbalanced fault is calculated according to formula (1)rec1(0),
    αrec1(0)=arccos ((1-Usdiff1)cosαnor)·k1Crec1(1)；
    Trigger Angle α under symmetric fault is calculated according to formula (2)rec2(0),
    αrec2(0)=arccos ((1-Usdiff2)cosαnor)·k2Crec2(2)；
    Wherein k1、k2For nargin coefficient, must be set according to the actual parameter of the urgent delayed trigger control system of rectification side；
    H2：Trigger Angle under unbalanced fault is exported into α respectivelyrec1(0)α is exported with Trigger Angle under symmetric faultrec2(0)Pass through gain For 1, Trigger Angle output inertia time constant kt under unbalanced faultrec1Inertia time constant is exported with Trigger Angle under symmetric fault ktrec2First order inertial loop, obtain under unbalanced fault Trigger Angle and export αrec1(1)With Trigger Angle α under symmetric faultrec2(1), And update Trigger Angle output inertia time constant kt under symmetric faultrec1Inertia time constant is exported with Trigger Angle under symmetric fault ktrec2；
    H3：α is exported to Trigger Angle under unbalanced fault respectivelyrec1(1)α is exported with Trigger Angle under symmetric faultrec2(1)Carry out amplitude limit, Obtain the reference value alpha of rectification side Trigger Angle firstrec1(2)The reference value alpha of angle value second is triggered with rectification siderec2(2)；
    I：Take the reference value alpha of rectification side Trigger Angle firstrec1(2), the reference value alpha of rectification side Trigger Angle secondrec2(2)And straight-flow system sheet The Trigger Angle reference value alpha of body Given current controller outputrec(0)Maximum as Trigger Angle reference value alpharec, export to direct current transportation Triggering system；
    J：Judge whether system is still being run, if then entering step (E), if not then control strategy terminates.
  2. 2. the commutation failure prevention method according to claim 1 based on rectification side Trigger Angle emergent control, its feature exist In：Unbalanced fault detection instantaneous value U in calculation procedure Ediff1, symmetric fault detection instantaneous value Udiff2, unbalanced fault inspection Survey sampled value Usdiff1With symmetric fault detection sampled value Usdiff2；
    Unbalanced fault detection instantaneous value Udiff1The order of severity of AC system unbalanced fault is characterized, its calculation formula is：
    Udiff1=| UA+UB+UC| (3)
    Wherein, UA、UB、UCFor change of current busbar voltage instantaneous value；
    Symmetric fault detection instantaneous value Udiff2The order of severity of AC system symmetric fault is characterized, its calculation formula is：
    Wherein, UA、UB、UCFor change of current busbar voltage instantaneous value；
    By unbalanced fault detection instantaneous value Udiff1Maximum keeps 12ms, produces unbalanced fault detection sampled value Usdiff1, will Symmetric fault detection instantaneous value Udiff2Maximum keeps 12ms, produces symmetric fault detection sampled value Usdiff2。
  3. 3. the commutation failure prevention method according to claim 1 based on rectification side Trigger Angle emergent control, its feature exist In：In described step F the startup threshold value S under unbalanced fault is controlled on the urgent delayed trigger of rectification siderec1With right Claim the startup threshold value S under failurerec2Specific determination step be：
    F1：Check that starting threshold value under unbalanced fault changes signal Frec1Whether it is 0, if so, then entering step F2, if it is not, then Srec1=Srec1(3)；
    If starting threshold value under unbalanced fault changes signal Frec1It is not 0, illustrates that the urgent delayed trigger of nearest rectification side has moved Make, can make it that AC system voltage pulsation is larger in the presence of the controller, therefore make the startup threshold value under unbalanced fault Srec1For a higher value Srec1(3), avoid the follow-up frequent movement of the urgent delayed trigger of rectification side；
    F2：Check that starting threshold value under symmetric fault changes signal Frec2Whether it is 0, if then Srec1=Srec1(2), if it is not, then Srec1=Srec1(1)；
    If starting threshold value under symmetric fault changes signal Frec2It is not 0, illustrates the symmetric fault of the urgent delayed trigger of nearest rectification side Part has acted, and can cause that AC system voltage pulsation is larger in the presence of the control, therefore make under unbalanced fault Start threshold value Srec1For a higher value Srec1(1), avoid the frequent movement of the urgent delayed trigger of rectification side.
    If starting threshold value under symmetric fault changes signal Frec2For 0, illustrate that nearest system has been at the shape of normal even running State, AC system voltage pulsation is smaller if etching system does not break down when this, therefore makes the actuation threshold under unbalanced fault Value Srec1For a relatively low value Srec1(2), the reaction sensitivity of control is improved, accelerates toggle speed；
    F3：Check that starting threshold value under symmetric fault changes signal Frec2Whether it is 0, if then entering step F4, if it is not, then Srec2=Srec2(3)；
    If starting threshold value under symmetric fault changes signal Frec2It is not 0, illustrates that the urgent delayed trigger of nearest rectification side has acted, It can cause that AC system voltage pulsation is larger in the presence of the control, therefore make the startup threshold value S under symmetric faultrec2For one Individual higher value Srec2(3), avoid the follow-up frequent movement of the urgent delayed trigger of rectification side；
    F4：Check that starting threshold value under unbalanced fault changes signal Frec1Whether it is 0, if then Srec2=Srec2(2), if not then Srec2=Srec2(1)；
    If starting threshold value under unbalanced fault changes signal Frec1It is not 0, illustrates the asymmetry of the urgent delayed trigger of nearest rectification side Faulty component has acted, and can cause that AC system voltage pulsation is larger in the presence of the control, therefore make under symmetric fault Startup threshold value Srec2For a higher value Srec2(1), avoid the frequent movement of the urgent delayed trigger of rectification side；
    If starting threshold value under unbalanced fault changes signal Frec1For 0, illustrate that nearest system has been at the shape of normal even running State, AC system voltage pulsation is smaller if etching system does not break down when this, therefore makes the startup threshold value under symmetric fault Srec2For a relatively low value Srec2(2), the reaction sensitivity of control is improved, accelerates toggle speed.
  4. 4. the commutation failure prevention method according to claim 3 based on rectification side Trigger Angle emergent control, its feature exist In：Start threshold value in described step G under unbalanced fault and change signal Frec1Start letter with delayed trigger under unbalanced fault Number Crec1, start threshold value under symmetric fault and change signal Frec2Delayed trigger enabling signal C under symmetric faultrec2Specific calculating Step：
    G1：If unbalanced fault detection instantaneous value Udiff1More than the startup threshold value S under unbalanced faultrec1Then by unbalanced fault Lower startup threshold value changes signal Frec11 is set to, changes signal F by threshold value is started under unbalanced faultrec1Broadening 0.5s, will not be right Claim delayed trigger enabling signal C under failurerec11 is set to, by delayed trigger enabling signal C under unbalanced faultrec1Broadening 0.05s, If unbalanced fault detection instantaneous value Udiff1No more than the startup threshold value S under unbalanced faultrec1, and start under unbalanced fault Threshold value changes signal Frec1More than broadening section before, then it will start threshold value under unbalanced fault and change signal Frec1It is set to 0； If unbalanced fault detection instantaneous value Udiff1No more than the startup threshold value S under unbalanced faultrec1, and lagged under unbalanced fault Trigger enabling signal Crec1More than broadening section before, then by delayed trigger enabling signal C under unbalanced faultrec1It is set to 0；
    If unbalanced fault detection instantaneous value Udiff1More than the startup threshold value S under unbalanced faultrec1, it is not right to illustrate to detect Claim failure, it is necessary to which rectification side Trigger Angle promptly increases；
    G2：If symmetric fault detection instantaneous value Udiff2More than the startup threshold value S under symmetric faultrec2It will then start under symmetric fault Threshold value changes signal Frec21 is set to, changes signal F by threshold value is started under symmetric faultrec2Broadening 0.5s, will be stagnant under symmetric fault Enabling signal C is triggered afterwardsrec21 is set to, by delayed trigger enabling signal C under symmetric faultrec2Broadening 0.05s, if symmetric fault is examined Survey instantaneous value Udiff2No more than the startup threshold value S under symmetric faultrec2, and start threshold value under symmetric fault and change signal Frec2It is super Broadening section before crossing, then it will start threshold value under symmetric fault and change signal Frec2It is set to 0；If symmetric fault detects instantaneous value Udiff2No more than the startup threshold value S under symmetric faultrec2, and delayed trigger enabling signal C under symmetric faultrec2More than before Broadening section, then by delayed trigger enabling signal C under symmetric faultrec2It is set to 0；
    If symmetric fault detection instantaneous value Udiff2More than the startup threshold value S under symmetric faultrec2, illustrate to detect symmetrical event Barrier is, it is necessary to which rectification side Trigger Angle promptly increases.
  5. 5. the commutation failure prevention method according to claim 4 based on rectification side Trigger Angle emergent control, its feature exist In：Trigger Angle α under unbalanced fault in described step H2rec1(1)With Trigger Angle α under symmetric faultrec2(1)Specific calculating step Suddenly, and under symmetric fault Trigger Angle exports inertia time constant ktrec1Inertia time constant is exported with Trigger Angle under symmetric fault ktrec2Specific renewal step：
    H2-1：Judge delayed trigger enabling signal C under unbalanced faultrec1Whether continuous 0.1s keeps 1, if so, then entering H2-2, otherwise unbalanced fault inertia time constant selection signal Trec1For 0；
    H2-2：As delayed trigger enabling signal C under unbalanced faultrec1After continuous 0.1s keeps 1, judge that DC voltage is real-time Measured value UdcWhether 0.65pu is more than, if so, then unbalanced fault inertia time constant selection signal Trec1For 1, if it is not, then Unbalanced fault inertia time constant selection signal Trec1For 0；
    H2-3：Judge delayed trigger enabling signal C under symmetric faultrec2Whether continuous 0.1s keeps 1, if then entering H2-4, Otherwise symmetric fault inertia time constant selection signal Trec2For 0；
    H2-4：As delayed trigger enabling signal C under symmetric faultrec2After continuous 0.1s keeps 1, judge that DC voltage is surveyed in real time Value UdcWhether 0.65pu is more than, if so, then symmetric fault inertia time constant selection signal Trec2For 1, if it is not, then symmetrical Failure inertia time constant selection signal Trec2For 0；
    H2-5：Utilize Trec3=Trec1ORTrec2Obtain and recover inertia time constant selection signal Trec3, and inertia time will be recovered Constant selection signal Trec3Broadening 0.3s；
    H2-6：Check and recover inertia time constant selection signal Trec3Whether it is 1, if so, it is defeated then to put Trigger Angle under unbalanced fault Go out inertia time constant ktrec1For Trec1(3), put Trigger Angle output inertia time constant kt under symmetric faultrec2For Trec2(3), it is no Then ktrec1、ktrec2Keep constant, and enter step H2-7；
    H2-7：Respectively by Trigger Angle α under unbalanced faultrec1(0)With Trigger Angle α under symmetric faultrec2(0)It is 1 by gain, no Trigger Angle output inertia time constant kt under symmetric faultrec1With Trigger Angle output inertia time constant kt under symmetric faultrec2's First order inertial loop, obtain Trigger Angle under unbalanced fault and export αrec1(1)α is exported with Trigger Angle under symmetric faultrec2(1)；
    H2-8：Compare Trigger Angle under unbalanced fault and export αrec1(1)With last round of αrec1(1)Calculated value, if unbalanced fault Lower Trigger Angle exports αrec1(1)Less than last round of αrec1(1)Calculated value, then put time constant ktrec1For Trec1(2)It is if not small In last round of αrec1(1)Calculated value, then put time constant ktrec1For Trec1(1)；
    H2-9：Compare Trigger Angle under symmetric fault and export αrec2(1)With last round of αrec2(1)Calculated value, if under symmetric fault touch Send out angle output αrec2(1)Less than last round of αrec2(1)Calculated value, then put time constant ktrec2For Trec2(2)If not less than upper The α of one wheelrec2(1)Calculated value, then put time constant ktrec2For Trec2(1)。
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CN109742786A (en) * 2019-01-10 2019-05-10 天津大学 The electrically continuous preventive control for commutation failure method of high-voltage dc transmission based on fuzzy control
CN110797898A (en) * 2019-10-31 2020-02-14 国网河南省电力公司电力科学研究院 Method and system for preventing and controlling commutation failure of extra-high voltage direct current multi-feed-in system
CN112332437A (en) * 2020-10-27 2021-02-05 山东电力研究院 Direct current transmission prediction type fault current limiting control method and system based on rectifying side

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