Utility model content
The application provides a kind of gamma kick device, it is possible to shortens and is disappeared from commutation failure to the transient process recovering commutation
The time of consumption, accelerate DC transmission system and recover the speed of power transmission.
For reaching above-mentioned purpose, the application adopts the following technical scheme that
Blow-out angle compensation module, gating module and control module;
Described blow-out angle compensation module, for receiving triggering signal U (s) of gamma kick, after U (s) is compensated, to
The first input end output of described gating module compensates and triggers signalWherein Kγ、TγIt is respectively one order inertia ring
The scale parameter of joint and time constant;Second input of described gating module connects U (s);
Described control module includes four inputs;Wherein first input end is used for receiving inverter side change of current busbar voltage letter
Number UL, ULFor indicating the magnitude of voltage of inverter side change of current bus;Second input is used for receiving transient state critical voltage signal UCL, UCL
When entering transient process after indicating described HVDC transmission system that commutation failure occurs, inverter side change of current busbar voltage
Marginal value;3rd input is used for receiving normality critical voltage signal UCL1, UCL1For indicating described HVDC transmission system
When transient process returns to properly functioning, the marginal value of inverter side change of current busbar voltage;Four-input terminal is used for receiving voltage
Fluctuation restriction signal | ε |, | ε | be used for indicating described HVDC transmission system when transient process returns to properly functioning, inverse
Become the lower limit of side change of current busbar voltage rate of change;
Described control module includes two outfans;First outfan of described control module connects described gating module
3rd input;Second outfan of described control module connects the four-input terminal of described gating module;Described control module
For according to ULAnd UCLGenerate the first gating signal, and by the first described first gating of outfan output of described control module
Signal;Described control module is additionally operable to according to UL、UCL1And | ε | generates the second gating signal, and by described control module
Second outfan exports described second gating signal;
Described gating module, for after receiving described first gating signal, gates described compensation and triggers signalAs blow-out angle reference value signal γref-T(s);It is additionally operable to after receiving described second gating signal,
Gate described triggering signal U (s) as blow-out angle reference value signal γref-T(s)。
Gamma kick device provided by the utility model, according to UL、UCL、UCL1And | ε | determines that transmission system is currently located
In transient process or normal course of operation.If normal course of operation, i.e. inverter commutation are normal, now output blow-out JIAOSHEN
Examine value signal γref-TS ()=U (s), when transmission system is properly functioning by determining gamma kick, keeps transmission system stable
Run.If transient process, i.e. Commutation Failure, now export the blow-out angle reference value signal through overcompensationThus shorten the time shared by transient process, accelerate DC transmission system and recover power biography
Defeated speed.
Embodiment
Embodiment of the present utility model provides a kind of gamma kick device, is installed on the inversion of HVDC transmission system
Side, with reference to shown in Fig. 1, gamma kick device 1 includes:
Blow-out angle compensation module 11, gating module 12 and control module 13.
Blow-out angle compensation module 11, for receiving triggering signal U (s) of gamma kick, after compensating U (s), Xiang Xuan
First input end 121 output of logical module 12 compensates and triggers signalWherein Kγ、TγIt is respectively one order inertia ring
The scale parameter of joint and time constant.Second input 122 of gating module 12 connects U (s).
Control module 13 includes four inputs.Wherein first input end 131 is used for receiving inverter side change of current busbar voltage
Signal UL, ULFor indicating the magnitude of voltage of inverter side change of current bus.Second input 132 is used for receiving transient state critical voltage signal
UCL, UCLWhen entering transient process after indicating HVDC transmission system that commutation failure occurs, inverter side change of current busbar voltage
Marginal value.3rd input 133 is used for receiving normality critical voltage signal UCL1, UCL1For indicating HVDC transmission system
When transient process returns to properly functioning, the marginal value of inverter side change of current busbar voltage.Four-input terminal 134 is used for receiving electricity
Pressure fluctuation restriction signal | ε |, | ε | be used for indicating HVDC transmission system when transient process returns to properly functioning, inversion
The lower limit of side change of current busbar voltage rate of change.
Control module 13 includes two outfans.First outfan 135 of control module 13 connects the of gating module 12
Three inputs 123.Second outfan 136 of control module 13 connects the four-input terminal 124 of gating module 12.Control module 13
For according to ULAnd UCLGenerate the first gating signal, and export the first gating letter by the first outfan 135 of control module 13
Number.Control module 13 is additionally operable to according to UL、UCL1And | ε | generates the second gating signal and defeated by the second of control module 13
Go out end 136 output the second gating signal.
The outfan 125 of gating module 12 is used for exporting blow-out angle reference value signal γref-T(s)。
Gating module 12 is after receiving the first gating signal, by outfan 125 and the gating module of gating module 12
The first input end 121 of 12 connects, and strobe compensation triggers signalAs blow-out angle reference value signal γref-T(s)
Output, i.e.
Gating module 12 is after receiving the second gating signal, by outfan 125 and the gating module of gating module 12
Second input 122 of 12 connects, and gating triggers signal U (s) as blow-out angle reference value signal γref-TS () exports, i.e.
γref-T(s)=U (s).
Shown in Fig. 2, in a kind of specific embodiment, control module 13 includes: transient state control module 131 is with often
State control module 132.
The structure of transient state control module 131:
Transient state control module 131 includes two inputs, and wherein first input end is used for connecting UL, the second input is used for
Connect UCL.Transient state control module 131 is for according to ULAnd UCLGenerate the first gating signal.
Optionally, transient state control module 131 is comparator.Owing to hereinafter there is also comparator, for ease of distinguishing position
In the comparator of diverse location, the present embodiment is distinguished with " the first comparator ", " the second comparator " such description.Transient state control
Molding block 131 is specially the first comparator, when the first comparator determines UL< UCLTime, generate the first gating signal.First compares
The outfan of device, as the first outfan 135 of control module 13, exports the first gating signal.
The structure of normality control module 132:
Normality control module 132 includes three inputs, and wherein first input end is used for connecting UL, the second input is used for
Connect UCL1.3rd input is used for connecting | ε |.Normality control module 132 is for according to UL、UCLAnd generate the second gating letter
Number.
Optionally, normality control module 132 includes: the second comparator 132A, the 3rd comparator 132B, differentiator 132C,
And logic and operation device 132D.
Two inputs of the second comparator 132A connect U respectivelyLAnd UCL1。
The input of differentiator 132C connects UL。
Two inputs of the 3rd comparator 132B connect outfan and | ε | of differentiator 132C respectively.
Two inputs of logic and operation device 132D connect outfan and the 3rd ratio of the second comparator 132A respectively
The relatively outfan of device 132B.When the second comparator 132A determines UL> UCL1, and the 3rd comparator 132B determinesTime, patrol
Collect and generate the second gating signal with 132D arithmetical unit.The outfan of logic and operation device 132D is as the second of control module 13
Outfan 136, exports the second gating signal.
In conjunction with the concrete structure of the gamma kick device 1 shown in Fig. 2, first gamma kick device 1 receives the inverter change of current
Bus voltage signal ULAmplitude and rate of change
Work as ULMarginal value U during transient process is entered less than transmission systemCLTime, determine that transmission system is in transient process,
Now strobe compensation triggers signalAs blow-out angle reference value signal γref-T(s), now
That is, UL< UCLTime,
DC transmission system transient process after commutation failure during the recovery of normal course of operation,For just,
Represent change of current bus voltage signal ULIt is gradually increasing, works as climbing speedExceed | ε | and rise above transmission system entrance
Marginal value U during normal course of operationCL1Time, gating triggers signal U (s), as blow-out angle reference value signal γref-T(s), this
Time γref-T(s)=U (s).
That is, whenAnd UL> UCL1Time, γref-T(s)=U (s).
As a example by CIGRE-1DC standard DC transmission system model in PSCAD electromagnetic transients program, verify this
The control effect of the gamma kick device 1 that embodiment is provided.
Consider that receiving end AC system is weak pattern system, take SCR=2.5, and Inverter Station change of current busbar voltage generation single-phase earthing
Fault, in the case of trouble duration is 50ms.In a kind of concrete application scenarios, in transient process to properly functioning mistake
In the transient process of journey, the compensation dosage at blow-out angle is changed as it is shown on figure 3, compensation dosage is gradually increased in transient process, maximum
Can reach 25 °.After transient process terminates, compensation dosage makes zero.
Fig. 4 show after blow-out angle compensates in transient process by gamma kick device 1, the blow-out angle change of inverter side
Curve (shown in solid in Fig. 4), and blow-out angle change curve (in Fig. 4 shown in dotted line) in the case of compensating.
In conjunction with Fig. 3, after breaking down when 2.0 seconds, in the case of compensating, blow-out angle is about extensive when 2.8 seconds
Multiple to 15 °, the time that transient process takies is 0.8 second.Controller 1 add compensate in the case of, blow-out angle 2.2 seconds time
Time is then restored to 15 °, and the time that transient process takies is 0.2 second, and transient process shortens to original 25%.Visible the present embodiment
The controller 1 provided, can be greatly shortened the time shared by transient process, thus accelerate DC transmission system and recover power
The speed of transmission.
Gamma kick device provided by the utility model, according to UL、UCL、UCL1And | ε | determines that transmission system is currently located
In transient process or normal course of operation.If normal course of operation, i.e. inverter commutation are normal, now output blow-out JIAOSHEN
Examine value signal γref-TS ()=U (s), when transmission system is properly functioning by determining gamma kick, keeps transmission system stable
Run.If transient process, i.e. Commutation Failure, now export the blow-out angle reference value signal through overcompensationThus shorten the time shared by transient process, accelerate DC transmission system and recover power biography
Defeated speed.
The above, detailed description of the invention the most of the present utility model, but protection domain of the present utility model does not limit to
In this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in change
Or replace, all should contain within protection domain of the present utility model.Therefore, protection domain of the present utility model should be described with power
The protection domain that profit requires is as the criterion.