CN109672229A - A kind of spare optimization method of multi-infeed DC system generator dynamic reactive - Google Patents
A kind of spare optimization method of multi-infeed DC system generator dynamic reactive Download PDFInfo
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- CN109672229A CN109672229A CN201910062423.9A CN201910062423A CN109672229A CN 109672229 A CN109672229 A CN 109672229A CN 201910062423 A CN201910062423 A CN 201910062423A CN 109672229 A CN109672229 A CN 109672229A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a kind of spare optimization methods of multi-infeed DC system generator dynamic reactive, are related to the reactive power compensation technology of HVDC transmission system, belong to the technical field of power generation, power transformation or distribution.The present invention quickly screens catastrophe failure collection using the voltage interaction factor and proposes a kind of Reactive Power Reserve evaluation index of voltage stabilization contribution to any bar change of current bus of covering any generator under multiple faults scene, then determines the reactive power reserve that each generator provides by the idle power output increment of transient state of each generator in each change of current bus commutation failure under all catastrophe failure scenes.The spare evaluation index of generator dynamic reactive can intuitively embody contribution of the generator reactive to multi-infeed DC system transient modelling voltage stabilization, can provide theoretical foundation for the reciprocation and optimization system Enhancement of Transient Voltage Stability of Electric Power Network Planning personnel analysis generator and change of current bus.
Description
Technical field
The invention discloses a kind of spare optimization methods of multi-infeed DC system generator dynamic reactive, are related to high voltage direct current
The reactive power compensation technology of transmission system belongs to the technical field of power generation, power transformation or distribution.
Background technique
In recent years, China's HVDC transmission system (High Voltage Direct Current, HVDC) development is fast
Speed, two load center regions of south electric network and East China Power Grid have preliminarily formed more feed-in receiving ends of multiple direct current drop points
Power grid.Although the pressure of load center electricity shortage has been effectively relieved in HVDC system, due to largely using half control type thyristor
As switch element, HVDC system need to consume at runtime it is a large amount of idle, meanwhile, the electrical couplings between alternating current-direct current, which act on, to be increased
The risk that cascading failure occurs, if more feed-in receiving-end systems can not provide enough reactive power supports, fault disturbance will lead to
Direct-current commutation failure even direct current locking, further may cause collapse of voltage, seriously endangers the stability of system.
Configuration dynamic reactive compensation device can effectively improve the reactive power support ability of system, but its cost is high, and
There is a large amount of generator in more feed-in receiving end power grids, the reactive power source most basic as electric system, it is necessary to sufficiently excavate
The idle potentiality of generator in receiving end power grid play its transient state reactive power support ability after a failure, reduce additional dynamic nothing
Function configures expense.Generator transient state reactive power support ability after a failure it can be appreciated that generator Reactive Power Reserve ability,
Therefore, how effectively to assess the Reactive Power Reserve ability of generator in multi-infeed DC system is to excavate generator reactive potentiality
Basis.
Chinese patent " a kind of method and system for reducing layer-specific access direct-current commutation failure risk "
(ZL201710060865.0) by time-domain-simulation calculate reactive source and change of current bus reactive power/voltage control sensitivity and by its
Dynamic reactive source reactive power reserve index is established as weight coefficient, system commutation is reduced by Optimal Reactive Power spare capacity
Risk of failure；Chinese patent " the spare optimization method of dynamic reactive for improving alternating current-direct current power grid Transient Voltage Stability "
(ZL201410004942.7) judge that each reactive source is steady to system transient modelling voltage by calculating the trace sensitivity in dynamic reactive source
Qualitatively contribution, and based on this amendment reactive source Reactive Power Reserve, alterating and direct current is promoted by optimization dynamic reactive source Reactive Power Reserve
Press Enhancement of Transient Voltage Stability；Above two dynamic reactive source Reactive Power Reserve index is fixed upper limit value form, is not embodied temporarily
The power output variation in dynamic reactive source during state.The dynamic reactive that Sun versatile person etc. defines reactive source is spare, and uses time weighting
Coefficient, node voltage support coefficient and failure service demand factor are modified spare to system transient modelling voltage peace to assess dynamic reactive
(Sun Quancai, Cheng Haozhong, Zhang Jian wait to improve the spare optimization method of dynamic reactive [J] of transient voltage security level to full value
Proceedings of the CSEE, 2015,35 (11): 2718-2725.), the index mainly for AC system, the application to its into
It has gone and has expanded and improve, proposed a kind of spare optimization method of generator dynamic reactive suitable for multi-infeed DC system.
Summary of the invention
Goal of the invention of the invention is the deficiency for above-mentioned background technique, provides a kind of multi-infeed DC system power generation
Motor-driven state Reactive Power Reserve optimization method intuitively embodies tribute of the generator reactive to multi-infeed DC system transient modelling voltage stabilization
It offers, solves the technical issues of existing Reactive Power Reserve scheme does not embody power output variation in dynamic reactive source in transient process.
The present invention adopts the following technical scheme that for achieving the above object
A kind of spare optimization method of multi-infeed DC system generator dynamic reactive, the concept based on trace sensitivity, point
The reactive power support ability for analysing generator under multiple faults scene, comprehensively considers generator to the voltage stabilization contribution degree of system, node
Different degree and failure severity are established as multi-infeed DC system generator dynamic reactive shown in formula (1), formula (2) is spare
Evaluation index:
In formula (1), formula (2):Dynamic reactive for i-th generator of multi-infeed DC system is spare, QMITRIt is complete
The generator dynamic reactive of system is spare,For i-th generator t moment idle power output,For i-th generator
Stable state is idle power output, S (t)ijIt is i-th generator to the voltage stabilization contribution degree of j-th strip change of current bus, ωBjIt is changed for j-th strip
Flow the pitch point importance of bus, ωFlFor the weight of catastrophe failure scene l, Ng, Ninv, Nf are respectively multi-infeed DC system hair
Motor number of units, DC inversion station change of current bus number, catastrophe failure scene number.
Track in voltage stabilization contribution degree transient process between change of current busbar voltage and generator reactive power output is sensitive
Degree characterization, and be modified with time weighting, the importance of different moments generator reactive power output is embodied, specific formula for calculation is such as
Under:
In formula (3):For tkVoltage stabilization contribution degree of the moment generator i to change of current bus j；ωtkFor tkMoment
Time weighting, indicate transient process in generator reactive additional issue it is faster, then voltage restore faster, system transient modelling voltage stability
It is stronger；For change of current bus j and trace sensitivity of the generator i in transient process.
The ratio table of pitch point importance each change of current bus corresponding direct current nominal transmission capacity and direct current total transmission capacity
Sign defines ωBj=Pdj/∑Pdj, wherein PdjFor the nominal transmission power of j-th strip direct current.
Failure severity is characterized by the voltage deviation of change of current bus each after fault clearance, and specific formula for calculation is as follows:
In formula (4), Vj0For voltage of the change of current bus j before failure, VjcrFor change of current bus j fault clearance moment electricity
Pressure.
In addition, needing first to carry out catastrophe failure collection screening before carrying out index calculating, the multi-infeed DC system generator
The spare optimization method of dynamic reactive further includes a kind of catastrophe failure collection screening technique, firstly, by node voltage reciprocation because
Sub- VIF quickly judges the ac bus set that will lead to direct-current commutation failure after short trouble, then, to line all in set
Three-phase N-1 short trouble is arranged in road, calculates corresponding failure severity index ω by fault simulationFl, choose the Nf of most serious
A failure forms the catastrophe failure collection needed for Reactive Power Reserve evaluation index calculates.
In catastrophe failure collection screening technique, direct current commutation mistake will lead to after ac bus short trouble is quickly judged with VIF
The specific standards lost are as follows:
In formula (5), ZijFor the mutual impedance between node i and node j, ZiiFor the self-impedance of node i, j is change of current bus section
Point, Ui0For the voltage per unit value of bus i, UiN、UjNRespectively node i, the voltage rating of change of current bus j, Δ UjiIt is short for node i
The Voltage Drop of change of current bus j behind road.
The present invention by adopting the above technical scheme, has the advantages that
(1) Reactive Power Reserve optimization method proposed by the present invention, is primarily based on node voltage interaction factor VIF and commutation
Failure voltage criterion screens ac bus set, then is screened by voltage deviation of each change of current bus after the removing of each short trouble
The biggish several fault scenes of the variation total amount of change of current bus constitute catastrophe failure collection after short trouble is removed out, drop significantly
The workload of low fault simulation scanning, improves the efficiency that entire Reactive Power Reserve optimization method is applied in practical bulk power grid.
(2) present invention demand spare for multi-infeed DC System Reactive Power, proposes one kind and covers under multiple faults scene
The Reactive Power Reserve evaluation index that any generator contributes the voltage stabilization of any bar change of current bus, fault scenes cover meeting
Lead to the opposite catastrophe failure of any time direct-current commutation failure, and in transient process after consideration trace sensitivity, time weighting
Integral is carried out to generator reactive power output changing value and embodies idle power output variation of the generator in transient process, it can be intuitive
Ground embodies the spare contribution to multi-infeed DC system transient modelling voltage stability of generator reactive, can be Electric Power Network Planning personnel
The reciprocation and optimization system Enhancement of Transient Voltage Stability of analysis generator and change of current bus provide theoretical foundation.
Detailed description of the invention
Fig. 1 is the flow chart of the publicly available spare optimization method of multi-infeed DC system generator dynamic reactive of the present invention.
Fig. 2 is the schematic diagram that improved double-fed enters 22 node systems during the present invention is implemented.
Specific embodiment
The technical solution of invention is described in detail with reference to the accompanying drawing.
The spare optimization method of multi-infeed DC system generator dynamic reactive disclosed by the invention is as shown in Figure 1.It is commenting
Before valence multi-infeed DC system generator dynamic reactive marginal capacity, the screening for carrying out catastrophe failure collection, catastrophe failure are first had to
The simulation result for collecting generic failure scanning determines, but actual electric network is in large scale, carries out fault scanning workload too to the whole network
Greatly, efficiency is too low, it is therefore necessary to reduce the range of fault scanning to improve the speed for establishing catastrophe failure collection.
Direct-current commutation failure main cause is that change of current busbar voltage is too low, it is generally recognized that change of current busbar voltage is lower than 0.8pu
And then direct-current commutation failure, change of current busbar voltage then directly judges commutation mistake lower than 0.6pu to pace of change when being more than 0.3pu/s
It loses, and then thinks that direct current restores normal commutation when change of current busbar voltage is restored to 0.75pu.Because VIF can be by node impedance
Matrix Calculating obtains, so can quickly determine that after ac bus failure whether is direct current in conjunction with VIF and commutation failure voltage criterion
Commutation failure can occur, therefore, the present invention proposes a kind of following catastrophe failure based on node voltage interaction factor VIF
Collect method of selection:
1) target grid nodal impedance matrix is sought, and the node voltage calculated between each ac bus and change of current bus interacts
Acting factor VIF；
2) the Voltage Drop value Δ that change of current bus j after three phase short circuit fault occurs for any ac bus i is sought according to VIF
Uji, shown in calculation formula such as formula (5)；
3) according to commutation failure voltage criterion Δ UjiIt may result in the exchange of direct-current commutation failure after >=0.2 determining failure
Bus set, and three-phase shortcircuit N-1 failure is occurred into for all alternating current circuits in the bus set as primary fault collection,
In, short dot is bus exit；
4) institute concentrated to primary fault is faulty to be emulated, and it is corresponding according to simulation result to calculate each failure
Severity index ωFl, shown in calculation formula such as formula (4), wherein ωBj=Pdj/∑Pdj；
5) to severity index ωFlIt sorts from large to small, most serious is chosen according to fault scenes number needed for catastrophe failure collection
Nf failure form final catastrophe failure collection.
After the catastrophe failure collection of final application has been determined, time-domain-simulation, meter can be carried out for each catastrophe failure scene
The idle power output for calculating generator in the trace sensitivity and transient process of each change of current bus and generator reactive, further calculates
Much spare evaluation index Q of direct current feedthrough system dynamic reactiveMITR, shown in calculation formula such as formula (1)~formula (4).
For convenience of program calculation, the integral calculation of generator dynamic reactive can use following discrete form approximate substitution:
In formula (6), Δ t is sampling interval, NkFor total sampled point of calculation interval.
Correspondingly, the trace sensitivity part in voltage stabilization contribution degree also uses perturbation method to carry out approximate calculation, specifically
Calculation formula is as follows:
In formula,Apply Δ U for the excitation reference voltage to generator ii,refPerturbation after in t=tkMoment generator
Idle power output is compared to the idle power output increment before applying perturbation；Vj(tk,Qi0) it is that the perturbation of excitation reference voltage is preceding in t=tkMoment
The voltage of change of current bus j；Apply after perturbing for excitation reference voltage in t=tkMoment change of current bus j's
Voltage.
Technical solution of the present invention is further described in detail below by the calculating of a specific embodiment, the present invention
Improved double-fed used in embodiment enters 22 node systems as shown in Fig. 2, the system is to be done to stablize by China Power scientific research to divide
6 machine, 22 node system of analysis is improved and is obtained, and deletes G6 phase modifier, and accesses the direct current that twice nominal transmission capacity are 200MW, and
The shunt capacitor of 100MVar is installed at corresponding change of current bus.
Firstly, obtaining the nodal impedance matrix of double feedthrough systems by PSD-BPA software and calculating each ac bus and two
Node voltage interaction factor between the change of current bus DC1 and DC2, and each exchange is calculated according to formula (5) on this basis
The Voltage Drop of change of current bus, is computed after busbar short-circuit, for DC1, will lead to direct current commutation mistake after having 7 busbar short-circuits
It loses, for DC2, will lead to direct-current commutation failure after having 8 busbar short-circuits, specifically as shown in table 1, table 2:
Change of current bus DC1 Voltage Drop after table 1 ac bus short circuit
| Node | N9 | N12 | N14 | N16 | N18 | N19 | N20 | N21 |
| DC1 voltage drop | 0.2547 | 0.4997 | 0.4735 | 0.9875 | 0.3789 | 0.3433 | 0.2165 | 0.2275 |
Change of current bus DC2 Voltage Drop after table 2 ac bus short circuit
Consolidated statement 1, table 2 can obtain the ac bus that will lead to direct-current commutation failure after short trouble as a result, both take union
Collection is combined into Bcf={ N1, N2, N7, N8, N9, N12, N14, N16, N18, N19, N20, N21 }.
Fault type of the present invention only considers three-phase N-1 short trouble, does not consider transformer and generator outlet bus-bar fault,
In addition short circuit inevitably results in direct-current commutation failure at change of current bus, therefore according to BcfInterior bus it can be concluded that primary fault collection such as
Under:
Wherein, each route includes head end bus exit and end bus exit three-phase shortcircuit, clear after 0.1s
Except failure and cut off a faulty line.All fault scenes are concentrated to carry out simulation analysis primary fault, and according to emulation
As a result the severity ω of each fault scenes is calculatedFl, 22 node example systems, two for choosing most serious are entered for the double-fed
Failure is as catastrophe failure collection.
Because the nominal transmission power of two direct currents is 200MW, the node of two change of current buses in the embodiment
Different degree ωB1=ωB2=0.5, convolution (4), calculate most serious two fault scenes it is as shown in table 3:
3 catastrophe failure collection fault scenes of table
| Fault scenes | Before N13-N12 | Before N9-N7 |
| Failure severity ωFl | 0.3718 | 0.3963 |
According to the catastrophe failure scene that table 3 determines, taking total duration that calculates is 5s, sampling time interval 0.002s, according to formula
(7), generator G1~G5 under two catastrophe failure scenes is calculated to tie respectively to the trace sensitivity of change of current bus DC1, DC2
It closes emulation and obtains idle power output of the generator in transient process, according to formula (1)~formula (4) and formula (6), calculate to generate electricity motor-driven
State Reactive Power Reserve evaluation index is as shown in table 4.
The 4 spare evaluation index of generator dynamic reactive of table
For node voltage interaction factor Ⅴ IF, existing research is generally acknowledged that VIF value is bigger, then the ac bus and the change of current
Bus reciprocation is stronger, and the bus importance stable for change of current busbar voltage is higher, and therefore, this section is also to node voltage
Interaction factor is calculated so as to comparative analysis, and calculated result is as shown in table 5.
5 node voltage interaction factor of table
| Node | G1 | G2 | G3 | G4 | G5 |
| Direct current is by 1 | 0.0526 | 0.1138 | 0.1422 | 0.1012 | 0.1540 |
| Direct current is by 2 | 0.2105 | 0.4231 | 0.1172 | 0.0624 | 0.0345 |
As seen from Table 4, the generator in the system all plays positive contribution to the voltage of change of current bus on the whole, each to generate electricity
The voltage stability of multi-infeed DC system can be improved in the reactive power that transient process is issued additional for machine, and wherein generator G5 exists
Contribution highest is stablized to system voltage under N9-N7 failure, the reactive power that generator G5 is issued additional under the scene gives two changes of current
The promotion of bus bring weighted voltage has reached 0.0509；Tribute of the generator G5 under N13-N12 failure to change of current busbar voltage
Offer numerically very big, but it plays negative interaction to the recovery of voltage, this is because under the fault scenes generator G5 it is idle go out
The promotion of power will lead to be reduced with the stronger generator reactive power output of DC converter bus DC1, DC2 reciprocation, receiving-end system
The voltage support ability of change of current bus is reduced instead, causes change of current busbar voltage to fall more serious, recovery and slows down；From system layer
From the point of view of face, the Reactive Power Reserve of generator improves the voltage stability of multi-infeed DC system, improves the ability of resisting risk.
In conjunction with 5 calculated result of table, because VIF is the mould of impedance, numerical value is positive, and does not have directionality.According to VIF
Common application method, each generator bus are bigger to the VIF of change of current bus, then it is bigger with the reciprocal effect of direct current, accordingly
Ground, it is bigger to the contribution of voltage stability of converter busbars, but actual result is shown, each generator reactive pair under N9-N7 failure
Change of current bus direct current is deviated under remaining scene, this is by the contribution numerically rule identical as VIF presentation of 1 voltage
Because VIF is only from the electrical link between the stable state electrical structure isolated-phase buses of system, but in actual transient process interior joint
Voltage change also with disturbance type and system dynamic regulation effect be closely related, it is mutual between generator and change of current bus
Effect is not unalterable, and these information are that impedance matrix can not embody, and therefore, analyzes multi-infeed systems with VIF
Enhancement of Transient Voltage Stability error it is too big, result credibility is low.
Refer in conclusion calculating the spare evaluation of the multi-infeed DC system generator dynamic reactive obtained according to transient emulation
Mark has comprehensively considered system electrical structure and dynamic regulation effect, intuitively embodies very much each generator pair under different faults scene
The stable contribution degree of system voltage can adjust operating scheme for dispatcher and provide clearly instruction.
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.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
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, and those of ordinary skills in the art should understand that still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equivalent replacement should all cover in the range that claim of the invention delimited.
Claims (9)
1. a kind of spare optimization method of multi-infeed DC system generator dynamic reactive, which is characterized in that
Utilize meeting after the determining short circuit of the node voltage interaction factor and commutation failure voltage criterion of multi-infeed DC system
Lead to the ac bus set of direct-current commutation failure and then form primary fault collection,
Catastrophe failure collection is filtered out from primary fault concentration, every generator under each catastrophe failure scene is calculated and any one is changed
The voltage stabilization contribution degree of bus is flowed,
The idle power output increment of transient state of each generator in each change of current bus commutation failure under all catastrophe failure scenes is calculated,
Calculate under each catastrophe failure scene the idle power output increment of transient state of each generator in each change of current bus commutation failure with
Every generator obtains the product of the voltage stabilization contribution degree of any one change of current bus each tight under corresponding catastrophe failure scene
The dynamic reactive of each generator is spare under weight fault scenes, the dynamic reactive of each generator under each catastrophe failure scene that adds up
The spare dynamic reactive for obtaining each generator is spare,
Add up each generator dynamic reactive it is spare so that determine all generators of multi-infeed DC system dynamic reactive it is standby
Use capacity.
2. a kind of spare optimization method of multi-infeed DC system generator dynamic reactive, feature exist according to claim 1
In, using change of current busbar voltage in transient process and generator reactive power output between trace sensitivity characterize every generator pair
The voltage stabilization contribution degree of any one change of current bus.
3. a kind of spare optimization method of multi-infeed DC system generator dynamic reactive, feature exist according to claim 1
In all in multi-infeed DC system using each catastrophe failure scene of voltage deviation characterization of change of current bus each after fault clearance
Weight in the dynamic reactive spare capacity calculating process of generator.
4. according to claim 1 to the spare optimization of a kind of multi-infeed DC system generator dynamic reactive described in any one of 3
Method, which is characterized in that transient state of each generator in each change of current bus commutation failure is idle out under each catastrophe failure scene
Power increment is the product of the pitch point importance of each generator reactive power output increment and each change of current bus under each catastrophe failure scene,
The section of each change of current bus is characterized using the ratio of the corresponding direct current nominal transmission capacity of each change of current bus and direct current total transmission capacity
Point different degree.
5. a kind of spare optimization method of multi-infeed DC system generator dynamic reactive, feature exist according to claim 4
In the dynamic reactive of each generator is spare by expression formula:Meter
It calculates,
Wherein,Dynamic reactive for i-th generator of multi-infeed DC system is spare,It is i-th generator in t moment
Idle power output,For the idle power output of stable state of i-th generator, S (t)ijIt is i-th generator of t moment to the j-th strip change of current
The voltage stabilization contribution degree of bus, ωBjFor the pitch point importance of j-th strip change of current bus, ωFlFor first catastrophe failure scene
Weight, Ng, Ninv, Nf be respectively generator number of units in multi-infeed DC system, DC inversion station change of current bus bar number, serious
Fault scenes number,For tkVoltage stabilization contribution degree of i-th generator of moment to j-th strip change of current bus, ωtkFor
tkThe time weighting at moment,For the trace sensitivity of j-th strip change of current bus and i-th generator in transient process,
PdjFor the nominal transmission power of j-th strip change of current bus, Vj0For voltage of the j-th strip change of current bus before failure, VjcrIt is changed for j-th strip
Bus is flowed in the voltage of fault clearance moment.
6. a kind of spare optimization method of multi-infeed DC system generator dynamic reactive, feature exist according to claim 5
In using the trace sensitivity of perturbation method approximate calculation j-th strip change of current bus and i-th generator in transient process, tkWhen
Carve the trace sensitivity of j-th strip change of current bus and i-th generator in transient processAre as follows:Wherein,Apply for the excitation reference voltage to i-th generator
Perturbation after tkMoment, i-th generator reactive power output compared the increment before applying perturbation,For to i-th generator
Excitation reference voltage apply perturb before j-th strip change of current bus in tkThe voltage at moment,To send out i-th
J-th strip change of current bus is in t after the excitation reference voltage of motor applies perturbationkThe voltage at moment.
7. a kind of spare optimization method of multi-infeed DC system generator dynamic reactive, feature exist according to claim 1
In the method for filtering out catastrophe failure collection from primary fault concentration are as follows:
Three-phase N-1 short trouble is arranged to route all in primary fault collection, each fault scenes are calculated by fault simulation
Weight, the fault scenes for selecting weighted value to be greater than given threshold constitute catastrophe failure collection.
8. a kind of computer equipment, comprising: memory, processor and storage can be run on a memory and on a processor
Computer program, which is characterized in that the processor performs the steps of when executing described program
Utilize meeting after the determining short circuit of the node voltage interaction factor and commutation failure voltage criterion of multi-infeed DC system
Lead to the ac bus set of direct-current commutation failure and then form primary fault collection,
Catastrophe failure collection is filtered out from primary fault concentration, every generator under each catastrophe failure scene is calculated and any one is changed
The voltage stabilization contribution degree of bus is flowed,
The idle power output increment of transient state of each generator in each change of current bus commutation failure under all catastrophe failure scenes is calculated,
Calculate under each catastrophe failure scene the idle power output increment of transient state of each generator in each change of current bus commutation failure with
Every generator obtains the product of the voltage stabilization contribution degree of any one change of current bus each tight under corresponding catastrophe failure scene
The dynamic reactive of each generator is spare under weight fault scenes, the dynamic reactive of each generator under each catastrophe failure scene that adds up
The spare dynamic reactive for obtaining each generator is spare,
Add up each generator dynamic reactive it is spare so that determine all generators of multi-infeed DC system dynamic reactive it is standby
Use capacity.
9. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
It is performed the steps of when row
Utilize meeting after the determining short circuit of the node voltage interaction factor and commutation failure voltage criterion of multi-infeed DC system
Lead to the ac bus set of direct-current commutation failure and then form primary fault collection,
Catastrophe failure collection is filtered out from primary fault concentration, every generator under each catastrophe failure scene is calculated and any one is changed
The voltage stabilization contribution degree of bus is flowed,
The idle power output increment of transient state of each generator in each change of current bus commutation failure under all catastrophe failure scenes is calculated,
Calculate under each catastrophe failure scene the idle power output increment of transient state of each generator in each change of current bus commutation failure with
Every generator obtains the product of the voltage stabilization contribution degree of any one change of current bus each tight under corresponding catastrophe failure scene
The dynamic reactive of each generator is spare under weight fault scenes, the dynamic reactive of each generator under each catastrophe failure scene that adds up
The spare dynamic reactive for obtaining each generator is spare,
Add up each generator dynamic reactive it is spare so that determine all generators of multi-infeed DC system dynamic reactive it is standby
Use capacity.
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