CN109327037A - A kind of layer-specific access direct-current commutation failure prevention and control setting method and device - Google Patents
A kind of layer-specific access direct-current commutation failure prevention and control setting method and device Download PDFInfo
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- CN109327037A CN109327037A CN201710645148.4A CN201710645148A CN109327037A CN 109327037 A CN109327037 A CN 109327037A CN 201710645148 A CN201710645148 A CN 201710645148A CN 109327037 A CN109327037 A CN 109327037A
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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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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention provides a kind of layer-specific access direct-current commutation failure prevention and control setting method and devices, it include: building electromechanics-electromagnetism hybrid simulation example, the example includes the electromagnetism side form type of the electromechanical side data of the extra-high voltage direct-current layer-specific access obtained and the extra-high voltage direct-current layer-specific access built；Failure is set, finds and causes the failure mode that commutation failure occurs for non-faulting level converter valve；The factor that shutdown angle is influenced in preventive control for commutation failure logic is analyzed, selection is suitable for the parameter of the preventive control for commutation failure of layer-specific access system；Preventive control for commutation failure strategy is formed according to the parameter of the preventive control for commutation failure.Technical solution provided by the invention uses electromechanics-electromagnetism hybrid simulation means, and direct current system is built in electromagnetism side, it is contemplated that is layered the detailed construction of direct current, is overcome the defect that traditional electro-mechanical model emulation method is unable to accurate simulation commutation failure process.
Description
Technical field
The present invention relates to the methods of a kind of simulation of electric system and calculating field, and in particular to a kind of layer-specific access direct current
Preventive control for commutation failure setting method and device.
Background technique
Extra-high voltage layer-specific access (1000kV and 500kV AC network) mode improve receiving-end system voltage support ability,
It has a clear superiority in terms of guidance trend reasonable layout.Currently, the preventive control for commutation failure plan of extra-high voltage DC transmission system
Slightly, to after trouble saving in voltage recovery process inverter side occur again commutation failure play the role of it is good.However, direct current
In the case that the failure of the single level of receiving end causes another level alternating voltage fall little, the pre- prevention and control of commutation failure at present
System strategy can not often make another level avoid the generation of commutation failure, or even occur leading to commutation since control strategy is improper
The case where failure.
If improving shutdown angle definite value rapidly when ac bus voltage reduces, direct current system is made to operate in lower touching in short-term
It sends out under angle, reserves enough nargin to the increase of angle of overlap, be that practical calculated shutdown angle can be made to be not reduced to is lower
Value, from without commutation failure.Current all kinds of preventive control for commutation failure strategies are to pass through detection voltage or electric current change
Change amount provides the shutdown angle definite value under different situations by certain logical operation process.
Preventive control for commutation failure carries out Detection & Controling using two kinds of detection means, takes two various detection means most
Big value, the increment by the output of self-sustaining link as the shutdown angle angle γ.
The parameter for influencing preventive control for commutation failure effect includes the following aspects:
(1) the amplitude coefficient A of voltage varietyCFAnd Aαβ_CF
The reduction of voltage variety amplitude coefficient can be such that preventive control for commutation failure meets in bigger voltage range to sentence play
And start, the promotion for turning off angle definite value after commutation failure in voltage recovery process is good.However, in some voltages
In the case where receiving small sample perturbations, excessively sensitive preventive control for commutation failure can bring the frequent increase at shutdown angle, and turn off
Angle and the idle of inverter consumption meet following formula:
Wherein: γ is shutdown angle, UdFor DC voltage, Ud0For direct current ideal floating voltage, IdFor DC current, XrInversion
Side equivalent reactance；
The increase at shutdown angle will cause inverter side inverter and absorb consumption reactive power increase, and idle fluctuation is unfavorable for handing over
The voltage stabilization of streaming system；And quickly steady can still be reached by the adjustment of other parameters for the recovery of system after commutation failure
Fixed purpose, therefore not to ACFAnd Aαβ_CFOriginal parameter is adjusted.
(2) preventive control for commutation failure gain GCFAnd Gαβ_CF
Relationship between preventive control for commutation failure gain and shutdown angle definite value meets:
Δ γ=cos-1(1-GCF×UDIFF)
Δ γ=cos-1(1-Gαβ_CF×Uαβ_DIFF)
Wherein, UDIFFAnd Uαβ_DIFFFor delay time, Δ γ is shutdown angle definite value increment.
From the above equation, we can see that GCFAnd Gαβ_CFIncrease to a certain extent can make the shutdown angle definite value increment Delta γ being calculated
Increase, commutation failure is not occurred during failure for the valve group without AC fault of layer-specific access direct current beneficial.Consider simultaneously
Inverter absorbs the idle relationship with shutdown angle, should control the amplitude that gain bring shutdown angle definite value increases.
(3) self-sustaining link time constant TCF
When play is sentenced in the starting that voltage variety meets preventive control for commutation failure, Δ γ can be promoted for shutdown angle definite value rapidly
Certain angle, if however after a failure in system recovery procedure, voltage is slowly promoted to exiting shutdown at once when being unsatisfactory for sentencing play
The increase of angle definite value easily causes the generation of primary new commutation failure.Therefore, prevention and control can be made by self-sustaining link
It gently exits, the number of commutation failure is effectively reduced.The self-sustaining link time constant T that conventional extra-high voltage direct-current usesCFIt is smaller,
Easily make non-faulting valve group that commutation failure occur in recovery process, therefore should suitably increase TCF, make to turn off the extension of angle retention time, have
Commutation failure does not occur during failure conducive to the valve group without AC fault of layer-specific access direct current.In conjunction with above-mentioned principle and direct current
System relevant parameter, TCFValue should suitably increase on former non-layered parameter basis, different direct currents are slightly different.
The collaboration of (4) two voltage level preventive control for commutation failure
Traditional preventive control for commutation failure passes through the voltage change of detection the connected ac bus of converter valve as starting
Foundation, and under layer-specific access Model Condition, the voltage class of the connected ac bus of inverter side inverter is different, a level hair
Voltage reduction caused by raw AC fault is also different to the influence degree of another level, and voltage declines the low level of degree may not
The threshold value of starting preventive control for commutation failure can be reached；But the series connection of inverter side valve group makes the DC current phase of different level
Together, commutation failure occurs for the valve group of a certain level, DC current can be made to be significantly increased, will result directly in the valve group of fault-free level
Commutation failure occurs.Therefore, after two level voltage class of original inverter side respectively calculate Δ γ, two Δ γ are calculated
Maximum value, the Δ γ common as two levels can be effectively prevented fault-free level converter valve and commutation failure occur.
Though there is the analysis of all kinds of customary DC preventive control for commutation failure, it is pre- for direct current layer-specific access commutation failure
Anti- control determination method for parameter rare research.
Summary of the invention
In view of the deficiencies of the prior art, the invention proposes a kind of layer-specific access direct-current commutation failure prevention and control adjusting sides
Method and device.
A kind of layer-specific access direct-current commutation failure prevention and control setting method,
Electromechanics-electromagnetism hybrid simulation example is constructed, the example includes the electromechanics of the extra-high voltage direct-current layer-specific access obtained
The electromagnetism side form type of side data and the extra-high voltage direct-current layer-specific access built；
Failure is set, finds and causes the failure mode that commutation failure occurs for non-faulting level converter valve；
Electromechanics-electromagnetism hybrid simulation example is utilized according to failure mode, the commutation that selection is suitable for layer-specific access system is lost
Lose the parameter of prevention and control；
Preventive control for commutation failure strategy is formed according to the parameter of the preventive control for commutation failure.
Further, the electromechanical side data include: the convergence of trend, the deviation of node voltage, Line Flow, under
Infuse the stabilization of power and electric system.
Further, the electromagnetism side form type includes: and builds layer-specific access direct current primary system model and build layering to connect
Enter DC control system model.
Further, the layer-specific access direct current primary system model of building includes:
Primary system is built, it is according to the practical structures of the extra-high voltage direct-current layer-specific access, rectification side and inverter side is double
The alternating current filter of pole, 16 groups of converter power transformers, 4 groups of double 12 pulse conversion bridges, DC filtering built with 16 group of six arteries and veins bridge
Device, earthing pole, smoothing reactor and DC line are successively built, and are filled according to DC engineering parameter；
DC inversion side structure is built, the AC system of two voltage class, the steady-state operation of two layer system are respectively connected to
Voltage is respectively the reference voltage of accessed AC system；
Rectification side structure is built according to customary DC structure.
Further, the layer-specific access DC control system model of building includes:
Rectification side structure is built using constant current control and low-voltage flow control of rationing the power supply；
Using constant current control, determine hold-off angle control, constant voltage control and low-voltage threshold currents VDCOL control build inversion
Side structure；
In inverter side according to preventive control for commutation failure logic is built, the parameter in the logic is using conventional extra-high straightening
The parameter of preventive control for commutation failure in streaming system.
Further, the setting failure finds and causes the failure mode that commutation failure occurs for non-faulting level converter valve
Include:
DC inversion top-cross Flow Line N-1 failure is respectively set in two voltage class level exchange near regions of direct current drop point,
And fault resstance is gradually reduced in Multi simulation running, increase the severity of failure, causes the change of current of non-faulting level until finding
The failure mode of valve generation commutation failure.
Further, described to utilize electromechanics-electromagnetism hybrid simulation example according to failure mode, selection is suitable for layer-specific access
The parameter of the preventive control for commutation failure of system includes:
(1) simulation observation only changes preventive control for commutation failure gain GCFAnd Gαβ_CFTo non-faulting level converter valve commutation
The influence of failure；
(2) simulation observation only changes preventive control for commutation failure self-sustaining link time constant TCFTo the non-faulting level change of current
The influence of valve commutation failure；
(3) two state modulator gain Gs of preventive control for commutation failure are changed simultaneouslyαβ_CFWith self-sustaining link time constant
TCFInfluence to non-faulting level converter valve commutation failure.
Further, the step (1) includes:
It is starting point with parameter 0.2 according to failure mode, successively increases preventive control for commutation failure gain with 0.05 for gradient
GCFAnd Gαβ_CFTwo parameters must be worth；
By the number of simulation observation commutation failure, until determining the pre- prevention and control of commutation failure when commutation failure no longer occurs
Gain G processedCFAnd Gαβ_CFValue.
Further, the step (2) includes:
It is starting point with parameter 0.00001 according to failure mode, successively increases commutation failure prevention with 0.00005 for gradient
Control self-sustaining link time constant TCFValue；
By the number of simulation observation commutation failure, until determining self-sustaining link time when commutation failure no longer occurs
Constant TCFValue.
Further, the step (3) includes:
According to failure mode, gain G is controlled by adjusting parameter simultaneouslyαβ_CFWith self-sustaining link time constant TCFValue；
By the number of simulation observation commutation failure, direct current system is enable faster to enter stable state, determines parameter control at this time
Gain G processedαβ_CFWith self-sustaining link time constant TCFValue thus direct current layer-specific access system commutation failure prevention ginseng
Number.
A kind of layer-specific access direct-current commutation failure prevention and control setting device, described device include:
Model buildings module, for constituting electromechanics-electromagnetism hybrid simulation example according to electromechanical side data and electromagnetism side form type；
The example includes the electromechanical side data of the extra-high voltage direct-current layer-specific access obtained and the extra-high voltage direct-current layer-specific access built
Electromagnetism side form type；
Malfunctioning module finds for failure to be arranged and causes the failure mode that commutation failure occurs for non-faulting level converter valve；
Determining module, for analyzing the factor for influencing shutdown angle in preventive control for commutation failure logic, selection is suitable for dividing
The parameter of the preventive control for commutation failure of layer access system；
Execution module, for forming preventive control for commutation failure strategy according to the parameter of the preventive control for commutation failure.
Further, the model buildings module includes:
Acquire submodule, the electromechanical side data of the extra-high voltage direct-current layer-specific access for acquisition；
Layer-specific access direct current primary system model submodule, for building layer-specific access direct current primary system model；
Layer-specific access DC control system model submodule, for building layer-specific access DC control system model.
Further, malfunctioning module is used for,
DC inversion top-cross Flow Line N-1 failure is respectively set in two voltage class level exchange near regions of direct current drop point,
And fault resstance is gradually reduced in Multi simulation running, increase the severity of failure, causes the change of current of non-faulting level until finding
The failure mode of valve generation commutation failure.
Further, determining module is used for,
(1) simulation observation only changes preventive control for commutation failure gain to the shadow of non-faulting level converter valve commutation failure
It rings；
(2) simulation observation only changes preventive control for commutation failure self-sustaining link time constant to non-faulting level converter valve
The influence of commutation failure；
(3) two state modulator gains for changing preventive control for commutation failure simultaneously and self-sustaining link time constant are to non-
The influence of failure level converter valve commutation failure.
Compared with the latest prior art, technical solution provided by the invention has the advantages that
1, technical solution provided by the invention uses electromechanics-electromagnetism hybrid simulation means, and direct current system is built in electromagnetism
Side, it is contemplated that be layered the detailed construction of direct current, overcome traditional electro-mechanical model emulation method and be unable to accurate simulation commutation failure mistake
The defect of journey.
2, technical solution provided by the invention uses electromechanics-electromagnetism hybrid simulation means, by the bulk power grid other than direct current
Build in electromechanical side, it is contemplated that direct current and external communication system influence each other, overcome traditional electromagnetic transient simulation need into
Row is external equivalent and simulation scale is caused to reduce, the defect that accuracy reduces.
3, technical solution provided by the invention can optimize the parameter of preventive control for commutation failure, effectively inhibit layer-specific access side
The extra-high voltage DC transmission system inverter side of formula is because an AC network failure connects another without AC fault power grid
Valve group operation influence, guarantee the valve group without AC fault can stable operation, commutation failure will not occur.
4, technical solution provided by the invention has extensive adaptability, and means are simple, and speed is fast, connects suitable for different layerings
Enter the preventive control for commutation failure parameter optimization of the extra-high voltage DC transmission system engineering of mode.
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is extra-high voltage direct-current layer-specific access AC system schematic diagram provided by the invention；
Fig. 3 is extra-high voltage direct-current layer-specific access schematic diagram provided by the invention；
Fig. 4 is preventive control for commutation failure logic diagram provided by the invention；
Fig. 5 is that preventive control for commutation failure parameter optimization front and back non-faulting level inverter side shutdown provided by the invention angle is imitative
True curve.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawing.For purpose, the technical solution for making the embodiment of the present invention
Clearer with advantage, following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out
It clearly and completely describes, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its embodiment, shall fall within the protection scope of the present invention.
A kind of layer-specific access direct-current commutation failure prevention and control setting method is present embodiments provided, electromechanics-electromagnetism is passed through
Simulation means propose a kind of improved control for the inverter side preventive control for commutation failure of existing layer-specific access DC engineering application
The extra-high voltage DC transmission system inverter side of layer-specific access mode can be effectively suppressed because of an AC network failure pair in system strategy
The influence of another valve group operation connected without AC fault power grid, guarantees the valve group stable operation without AC fault, research
Achievement can instruct large-scale alternating current-direct current combined hybrid system simulation analysis personnel to carry out DC control adjusting performance, and reality with higher is answered
With value.Flow chart is as shown in Figure 1, mainly comprise the steps that
Step 1: build extra-high voltage direct-current layer-specific access alternating current-direct current combined hybrid system calculate needed for electromechanical side trend and steady
Fixed number evidence.
The step 1 includes:
Step 1-1: the alternating current-direct current combined hybrid system for building extra-high voltage direct-current layer-specific access calculates required bulk power grid, is based on machine
Electric Transient calculation form is carried out；
Step 1-2: trend primary Calculation is carried out using Load Flow Calculation Software, guarantees the convergence of trend；Check node electricity
Voltage levels guarantee that the deviation of node voltage meets the relevant regulations in " power system voltage and reactive power fire protection technology "；
It checks that Line Flow is horizontal, guarantees that Line Flow is no more than the steady limit of heat of route itself；It checks transformer bet power, guarantees
Power of betting is no more than the rated capacity of transformer；
Step 1-3: it carries out stablizing primary Calculation (mainly calculating according to existing software) using stability Calculation software, guarantee
Electric system is able to maintain stabilization in microvariations or single failure.
Step 2: building the electromagnetism side detailed model of extra-high voltage direct-current layer-specific access, model includes that layer-specific access direct current is primary
System and control system and preventive control for commutation failure logic.The step 2 includes:
Step 2-1: the base components of use include but is not limited to: three-phase RLC element, single-phase RLC element, thyristor member
Part, transmission line of electricity element, three-phase single-phase fault element, three-phase two-winding transformer element；Primary system is modeled according to practical knot
Structure is by the bipolar alternating current filter of rectification side and inverter side, 16 groups of converter power transformers, built with 16 group of six arteries and veins bridge 4 groups double 12
Pulse conversion bridge, DC filter, earthing pole, smoothing reactor, DC line are successively built, and are filled out according to DC engineering parameter
It writes, in which: direct current system is 5000MW, rated DC current using double 12 pulsation 2*400kV inverters, monopole nominal DC power
Stream be 6.25kA, inverter inverter side turn off angle be 17 °, the steady-state voltage of receiving end two layer system be respectively 525kV,
1050kV；DC inversion side is respectively connected to 525kV and 1050kV bus；It is identical as customary DC to rectify side structure；
Step 2-2: building layer-specific access DC control system model, and rectification side is rationed the power supply using constant current control, low-voltage
Flow control, inverter side use constant current control, determine hold-off angle control, constant voltage control, low-voltage threshold currents VDCOL control；Separately
Outside, preventive control for commutation failure logic is built in inverter side, as shown in Figure 4.Parameter in logic is using conventional extra-high voltage direct-current
Preventive control for commutation failure parameter in system.
Preventive control for commutation failure carries out Detection & Controling using two kinds of detection means, takes the maximum of two kinds of detection means
Value exports the increment Delta γ ' as the shutdown angle angle γ by self-sustaining link, as turning off incrementss of the angle during failure,
Increase the definite value for determining hold-off angle control in short-term, the generation of voltage Restoration stage commutation failure after trouble saving occurs.
Step 3: forming electromechanics-electromagnetism hybrid simulation example, it is ensured that the stable operation under non-failure conditions.The step 3
Include:
Step 3-1: setting electromechanics-electromagnetism hybrid simulation interface forms electromechanics-electromagnetism hybrid simulation example, wherein extra-high
Straightening flow point layer access model is in electromagnetism side, remaining power grid is in electromechanical side；
Step 3-2: under fault-free conditions, hybrid simulation example can stable operation, observe that direct current system monopole is straight
Stream power, DC current, inverter inverter side shutdown angle reach setting valve, the steady-state voltage difference of receiving end two layer system
By connection bus reference voltage.
Step 4: DC inversion side ac bus N-1 failure is respectively set in two voltage class levels of direct current drop point, looks for
To the failure mode for causing non-faulting level converter valve generation commutation failure.
In the step 4, DC inversion side ac bus N-1 event is respectively set in two voltage class levels of direct current drop point
Barrier, and fault resstance is gradually reduced in Multi simulation running, it is intended that increase the severity of failure, then failure level inverter side exchanges
The reduction of voltage will affect the alternating voltage of non-faulting level, increases and causes non-faulting level DC converter valve generation commutation failure
A possibility that；Cause the failure mode that commutation failure occurs for non-faulting level converter valve until finding.
Step 5: several factors at shutdown angle: the amplitude system of voltage change are influenced in amendment preventive control for commutation failure logic
Number, control gain, self-sustaining link time constant.In the step 5, layer-specific access direct-current commutation failure prevention and control parameter is excellent
Change includes: preventive control for commutation failure gain GCFAnd Gαβ_CF, self-sustaining link time constant TCF。
By electromechanics-electromagnetism hybrid simulation means, being adjusted in accordance with the following steps to above-mentioned parameter and emulating determination is
The no extra-high voltage DC transmission system inverter side that can effectively inhibit layer-specific access mode is because of an AC network failure to another
The influence of one valve group operation connected without AC fault power grid:
Step 5-1: simulation observation only changes preventive control for commutation failure gain GCFAnd Gαβ_CFTo non-faulting level converter valve
The influence of commutation failure.Failure mode determined by setting steps 4 is starting point with traditional parameters 0.2, to the pre- prevention and control of commutation failure
Gain G processedCFAnd Gαβ_CFTwo parameters are successively increased with 0.05 for gradient, are gradually subtracted by the number of commutation failure known to emulation
It is few, until avoiding the generation of non-faulting level converter valve commutation failure completely.
Step 5-2: simulation observation only changes preventive control for commutation failure self-sustaining link time constant TCFTo non-faulting layer
The influence of face converter valve commutation failure.Failure mode determined by setting steps 4 is starting point with traditional parameters 0.00001, exchange
Mutually failure prevention and control self-sustaining link time constant TCFParameter is successively increased with 0.00005 for gradient, by changing known to emulation
Mutually the number of failure gradually decreases, until avoiding the generation of non-faulting level converter valve commutation failure completely.
Step 5-3: while changing two parameter G of preventive control for commutation failureαβ_CFAnd TCFTo non-faulting level converter valve
The influence of commutation failure.Step 5-1 and 5-2 are the mode that commutation failure prevention is carried out in the case where individually adjusting a certain parameter,
And adjusted while by two parameters by a small margin, it can achieve optimal effect, direct current system enable faster to enter stable state.
Non-faulting level inverter side shutdown angle simulation curve is as shown in figure 5, visual parameter before and after preventive control for commutation failure parameter optimization
Effect of optimization is obvious.
Step 6: proposing improved control strategy, effectively inhibit the extra-high voltage DC transmission system inversion of layer-specific access mode
Side is because of influence of the AC network failure to another valve group operation connected without AC fault power grid.
It is connect using direct current layer-specific access system and AC system in Fig. 2, Fig. 3 as an example, building extra-high voltage direct-current layering
The alternating current-direct current combined hybrid system entered calculates required electromechanical side trend and stablizes data, and concrete structure diagram is as shown in Figure 2.It builds extra-high
The electromagnetism side detailed model of straightening stream layer-specific access, concrete structure diagram are as shown in Figure 3.Direct current system is using double 12 pulsation 2*
400kV inverter, monopole nominal DC power are 5000MW, rated direct current 6.25kA, inverter inverter side shutdown angle
It is 17 °, the steady-state voltage of receiving end two layer system is respectively 525kV, 1050kV；DC inversion side is respectively connected to 525kV
With 1050kV bus；It is identical as customary DC to rectify side structure；Electromagnetism side form type includes layer-specific access direct current primary system and control
System processed and preventive control for commutation failure logic；Form electromechanics-electromagnetism hybrid simulation example, it is ensured that steady under non-failure conditions
Fixed operation, observes that direct current system operates under specified operating condition.
DC inversion side ac bus N-1 failure is respectively set in two voltage class levels of direct current drop point, finds initiation
The failure mode of commutation failure occurs for non-faulting level converter valve, is the three-phase shortcircuit ground connection on 525kV inverter side ac bus
Failure, fault ground resistance are 0.00001 ohm, then it is believed that this failure is metallic earthing failure.
By electromechanics-electromagnetism hybrid simulation means, being adjusted as follows to above-mentioned parameter and emulating determination is
The no extra-high voltage DC transmission system inverter side that can effectively inhibit layer-specific access mode is because of an AC network failure to another
The influence of one valve group operation connected without AC fault power grid:
1. simulation observation only changes preventive control for commutation failure gain GCFAnd Gαβ_CFNon-faulting level converter valve commutation is lost
The influence lost.Failure mode determined by setting steps 4 is starting point with traditional parameters 0.2, to preventive control for commutation failure gain
GCFAnd Gαβ_CFTwo parameters are successively increased with 0.05 for gradient, are gradually decreased by the number of commutation failure known to emulation, until
The generation of non-faulting level converter valve commutation failure is avoided completely.
By increasing parameter Gαβ_CFValue, gradually decreased by the number of commutation failure known to emulation, work as Gαβ_CF=
0.35, it can completely avoid the generation of the side 1050kV commutation failure.
2. simulation observation only changes preventive control for commutation failure self-sustaining link time constant TCFTo the non-faulting level change of current
The influence of valve commutation failure.Failure mode determined by setting steps 4 is starting point with traditional parameters 0.0001, to commutation failure
Prevention and control self-sustaining link time constant TCFParameter is successively increased with 0.00005 for gradient, passes through commutation failure known to emulation
Number gradually decrease, until avoiding the generation of non-faulting level converter valve commutation failure completely.
By increasing parameter TCFValue, gradually decreased by the number of commutation failure known to emulation, work as TCF=0.00025
When, it can completely avoid the generation of the side 1050kV commutation failure.
3. changing two parameter G of preventive control for commutation failure simultaneouslyαβ_CFAnd TCFNon-faulting level converter valve commutation is lost
The influence lost.Adjusted while by two parameters by a small margin, can achieve optimal effect, enable direct current system faster into
Enter stable state.
As shown in figure 5, working as Gαβ_CFAnd TCFUsing initial parameter, three-phase ground failure occurs on 525kV change of current bus
Afterwards, in failure vanishes voltage recovery process, 4 commutation failures occur for 1050kV level converter valve, and system recovery time is up to
1.6s；Work as Gαβ_CFParameter is adjusted to 0.2, while TCFWhen being adjusted to 0.0001,1050kV level converter valve occurs 2 commutations and loses
It loses, system recovery time 1.2s；Work as Gαβ_CFParameter is adjusted to 0.25, while TCFWhen being adjusted to 0.0001,1050kV level is changed
Commutation failure will not occur completely in voltage recovery process for stream valve, and system recovery time is only 0.6s.The adjustment of two parameters
Equal amplitude is smaller, and the speed that post-fault system restores is also more rapid.By this Gαβ_CFAnd TCFResult as this direct current layering connect
Enter the parameter of the preventive control for commutation failure of system.
It is real based on electromechanics-electromagnetism hybrid simulation direct current layer-specific access system preventive control for commutation failure parameter determination method
Existing more convenient, clear concept is applied and is verified in actual electric network.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, are intended to be within the scope of the claims of the invention.
Claims (14)
1. a kind of layer-specific access direct-current commutation failure prevention and control setting method, it is characterised in that:
Electromechanics-electromagnetism hybrid simulation example is constructed, the example includes the electromechanical side number of the extra-high voltage direct-current layer-specific access obtained
According to the electromagnetism side form type with the extra-high voltage direct-current layer-specific access built；
Failure is set, finds and causes the failure mode that commutation failure occurs for non-faulting level converter valve；
Electromechanics-electromagnetism hybrid simulation example is utilized according to failure mode, the commutation failure that selection is suitable for layer-specific access system is pre-
The parameter of anti-control；
Preventive control for commutation failure strategy is formed according to the parameter of the preventive control for commutation failure.
2. a kind of layer-specific access direct-current commutation failure prevention and control setting method as described in claim 1, which is characterized in that institute
Stating electromechanical side data includes: the convergence of trend, the deviation of node voltage, Line Flow, bet power and electric system
Stablize.
3. a kind of layer-specific access direct-current commutation failure prevention and control setting method as described in claim 1, which is characterized in that institute
Stating electromagnetism side form type includes: to build layer-specific access direct current primary system model and build layer-specific access DC control system model.
4. a kind of layer-specific access direct-current commutation failure prevention and control setting method as claimed in claim 3, which is characterized in that institute
It states and builds layer-specific access direct current primary system model and include:
Primary system is built, it is according to the practical structures of the extra-high voltage direct-current layer-specific access, rectification side and inverter side is bipolar
Alternating current filter, the 4 groups of double 12 pulse conversion bridges built with 16 group of six arteries and veins bridge, DC filter, connects 16 groups of converter power transformers
Earth polar, smoothing reactor and DC line are successively built, and are filled according to DC engineering parameter；
DC inversion side structure is built, the AC system of two voltage class, the steady-state voltage of two layer system are respectively connected to
The reference voltage of respectively accessed AC system；
Rectification side structure is built according to customary DC structure.
5. a kind of layer-specific access direct-current commutation failure prevention and control setting method as claimed in claim 3, which is characterized in that institute
It states and builds layer-specific access DC control system model and include:
Rectification side structure is built using constant current control and low-voltage flow control of rationing the power supply；
Using constant current control, determine hold-off angle control, constant voltage control and low-voltage threshold currents VDCOL control build inverter side knot
Structure；
In inverter side according to preventive control for commutation failure logic is built, the parameter in the logic is using conventional extra-high voltage direct-current system
The parameter of preventive control for commutation failure in system.
6. a kind of layer-specific access direct-current commutation failure prevention and control setting method as described in claim 1, which is characterized in that institute
Setting failure is stated, the failure mode for finding initiation non-faulting level converter valve generation commutation failure includes:
DC inversion top-cross Flow Line N-1 failure is respectively set in direct current drop point two voltage class levels exchange near regions, and
Fault resstance is gradually reduced in Multi simulation running, increases the severity of failure, causes non-faulting level converter valve hair until finding
The failure mode of raw commutation failure.
7. a kind of layer-specific access direct-current commutation failure prevention and control setting method as described in claim 1, which is characterized in that institute
It states according to failure mode using electromechanics-electromagnetism hybrid simulation example, the commutation failure that selection is suitable for layer-specific access system prevents
The parameter of control includes:
(1) simulation observation only changes preventive control for commutation failure gain GCFAnd Gαβ_CFTo non-faulting level converter valve commutation failure
It influences；
(2) simulation observation only changes preventive control for commutation failure self-sustaining link time constant TCFNon-faulting level converter valve is changed
The mutually influence of failure；
(3) two state modulator gain Gs of preventive control for commutation failure are changed simultaneouslyαβ_CFWith self-sustaining link time constant TCFIt is right
The influence of non-faulting level converter valve commutation failure.
8. a kind of layer-specific access direct-current commutation failure prevention and control setting method as claimed in claim 7, which is characterized in that institute
Stating step (1) includes:
It is starting point with parameter 0.2 according to failure mode, successively increases preventive control for commutation failure gain G with 0.05 for gradientCFWith
Gαβ_CFTwo parameters must be worth；
By the number of simulation observation commutation failure, until determining that preventive control for commutation failure when commutation failure no longer occurs increases
Beneficial GCFAnd Gαβ_CFValue.
9. a kind of layer-specific access direct-current commutation failure prevention and control setting method as claimed in claim 7, which is characterized in that institute
Stating step (2) includes:
It is starting point with parameter 0.00001 according to failure mode, successively increases preventive control for commutation failure with 0.00005 for gradient
Self-sustaining link time constant TCFValue；
By the number of simulation observation commutation failure, until determining self-sustaining link time constant when commutation failure no longer occurs
TCFValue.
10. a kind of layer-specific access direct-current commutation failure prevention and control setting method as claimed in claim 7, which is characterized in that
The step (3) includes:
According to failure mode, gain G is controlled by adjusting parameter simultaneouslyαβ_CFWith self-sustaining link time constant TCFValue；
By the number of simulation observation commutation failure, direct current system is enable faster to enter stable state, determines that state modulator increases at this time
Beneficial Gαβ_CFWith self-sustaining link time constant TCFValue thus direct current layer-specific access system commutation failure prevention parameter.
11. a kind of layer-specific access direct-current commutation failure prevention and control setting device, which is characterized in that described device includes:
Model buildings module, for constituting electromechanics-electromagnetism hybrid simulation example according to electromechanical side data and electromagnetism side form type；It is described
Example includes the electromagnetism of the electromechanical side data of the extra-high voltage direct-current layer-specific access obtained and the extra-high voltage direct-current layer-specific access built
Side form type；
Malfunctioning module finds for failure to be arranged and causes the failure mode that commutation failure occurs for non-faulting level converter valve；
Determining module, for analyzing the factor for influencing shutdown angle in preventive control for commutation failure logic, selection is suitable for layering and connects
Enter the parameter of the preventive control for commutation failure of system；
Execution module, for forming preventive control for commutation failure strategy according to the parameter of the preventive control for commutation failure.
12. a kind of layer-specific access direct-current commutation failure prevention and control setting device as claimed in claim 11, which is characterized in that
The model buildings module includes:
Acquire submodule, the electromechanical side data of the extra-high voltage direct-current layer-specific access for acquisition；
Layer-specific access direct current primary system model submodule, for building layer-specific access direct current primary system model；
Layer-specific access DC control system model submodule, for building layer-specific access DC control system model.
13. a kind of layer-specific access direct-current commutation failure prevention and control setting device as claimed in claim 11, which is characterized in that
Malfunctioning module is used for,
DC inversion top-cross Flow Line N-1 failure is respectively set in direct current drop point two voltage class levels exchange near regions, and
Fault resstance is gradually reduced in Multi simulation running, increases the severity of failure, causes non-faulting level converter valve hair until finding
The failure mode of raw commutation failure.
14. a kind of layer-specific access direct-current commutation failure prevention and control setting device as claimed in claim 11, which is characterized in that
Determining module is used for,
(1) simulation observation only changes influence of the preventive control for commutation failure gain to non-faulting level converter valve commutation failure；
(2) simulation observation only changes preventive control for commutation failure self-sustaining link time constant to non-faulting level converter valve commutation
The influence of failure；
(3) two state modulator gains for changing preventive control for commutation failure simultaneously and self-sustaining link time constant are to non-faulting
The influence of level converter valve commutation failure.
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| CN113049957A (en) * | 2021-03-29 | 2021-06-29 | 华北电力大学（保定） | On-line detection method for slight turn-to-turn short circuit fault of rotor winding of synchronous phase modulator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110266032A (en) * | 2019-05-14 | 2019-09-20 | 天津大学 | A kind of feasible zone of HVDC system commutation process describes method |
| CN110266032B (en) * | 2019-05-14 | 2023-01-03 | 天津大学 | Feasible domain description method for HVDC system commutation process |
| CN110581564A (en) * | 2019-08-12 | 2019-12-17 | 国家电网有限公司 | Method and system for determining extra-high voltage direct current commutation failure accelerated protection strategy |
| CN110581564B (en) * | 2019-08-12 | 2022-03-04 | 国家电网有限公司 | Method and system for determining extra-high voltage direct current commutation failure accelerated protection strategy |
| CN111506993A (en) * | 2020-04-14 | 2020-08-07 | 国网江苏省电力有限公司电力科学研究院 | On-site testing method and system for commutation failure protection |
| CN111506993B (en) * | 2020-04-14 | 2022-08-23 | 国网江苏省电力有限公司电力科学研究院 | On-site testing method and system for commutation failure protection |
| CN113049957A (en) * | 2021-03-29 | 2021-06-29 | 华北电力大学（保定） | On-line detection method for slight turn-to-turn short circuit fault of rotor winding of synchronous phase modulator |
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