CN109546691A - A kind of electric system generator rotor angle Transient Instability cuts the searching method and device of machine automatically - Google Patents
A kind of electric system generator rotor angle Transient Instability cuts the searching method and device of machine automatically Download PDFInfo
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- CN109546691A CN109546691A CN201811436599.8A CN201811436599A CN109546691A CN 109546691 A CN109546691 A CN 109546691A CN 201811436599 A CN201811436599 A CN 201811436599A CN 109546691 A CN109546691 A CN 109546691A
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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
- H02J3/48—Controlling the sharing of the in-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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
-
- 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
-
- 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]
Abstract
The application provides the searching method and device that a kind of electric system generator rotor angle Transient Instability cuts machine automatically, in described search method, after obtaining target's center's branch, end system and receiving-end system are sent into electric system, system stability is improved by accurately cutting off sending unit, " blindness " that unit is cut in artificial selection is avoided, is solved in the prior art by the subjective judgement for calculating analysis personnel, the lower problem of accuracy.In addition, searching method provided by the present application can use computer technology realization, calculating analysis efficiency is improved, solves the problems, such as to expend time and manpower in the prior art.Further, by specifying the preferential excision sequence of power generation node to power generation node generator terminal voltage phase angle sequence, the machine result of cutting is optimized the application.
Description
Technical field
This application involves power system security stability control techniques fields, and in particular to a kind of electric system generator rotor angle transient state mistake
The searching method and device of machine are surely cut automatically.
Background technique
Electric power system dispatching or planning department are being scheduled, are planning or when other electric system researchs, it will usually use
The power system analysis softwares such as PSD-BPA, PSS/E, PSASP to electric system carry out simulation analysis, simulation analysis include stable state,
Dynamic and transient emulation analysis.In power system transient simulation analytic process, it is possible that since electric power system fault is led
The case where generator rotor angle Transient Instability of cause, two kinds main for the solution of generator rotor angle Transient Instability of tradition, the first is that reduction is defeated
Electric section tidal current, second is timely cut-out generating set, the method quilt of cut-out generating set after breaking down
It referred to as " cuts machine ", makes electric system restore stable again by cutting machine, to guarantee the safe and stable operation of electric system.
When solving generator rotor angle Transient Instability using machine is cut, critical issue is the generator for how selecting to need to cut off
Group.Due in electric system after breaking down, it will usually there is asynchronous oscillation, during an asynchronous oscillation, lose
Walk the point of the voltage minimum occurred on the interconnection of oscillation, as asynchronous oscillation oscillation center.Existing selection cuts off generator
Group method in, generator rotor angle Transient Instability generation after, calculate analysis personnel firstly the need of observation transient emulation analysis in include
The generator rotor angle of each generating set is posed for photograph curve, is determined by generator rotor angle curve of posing for photograph and is caused the generating set area of generator rotor angle Transient Instability
Domain, rule of thumb excision cuts off one or more groups of generating sets in the generating set region.
However, inventor has found in the research process of the application, the method for the generating set that existing selection needs to cut off
The subjective judgement for calculating analysis personnel is relied primarily on, accuracy is lower；In addition, during the generating set of selection excision,
Continuous " trial and error " is needed, i.e., one by one increases or decreases the generating set quantity of excision, to seek to solve generator rotor angle Transient Instability
Critical state, in the process, it usually needs it is a large amount of to calculate, expend time and manpower.
Summary of the invention
The application provides the searching method and device that a kind of electric system generator rotor angle Transient Instability cuts machine automatically, existing to solve
In the method for selection excision generating set, accuracy is low, expends the problem of time and manpower.
The application's in a first aspect, provide the searching method that a kind of electric system generator rotor angle Transient Instability cuts machine automatically, comprising:
In the case where occurring generator rotor angle Transient Instability in transient emulation analytic process, electric system asynchronous oscillation center is obtained
Place branch, using branch where electric system asynchronous oscillation center as target's center's branch；
Calculation of tidal current of the target's center's branch before breaking down is obtained, and according to the Load flow calculation knot
Electric system is divided into sending and receiving-end system by the effective power flow direction in fruit, and the sending is to the receiving end system
System transmission power；
The power generation node for including in the sending is obtained, and obtains each power generation node in the Load flow calculation
As a result set end voltage phase angle and active power output in；
It sorts according to the size order of the set end voltage phase angle, establishes power generation node sequencing table, the power generation node row
Include power generation node, set end voltage phase angle and active power output in sequence table, wherein each power generation node and the set end voltage
Phase angle or active power output are corresponding；
Determination cut machine amount, according to it is described power generation node sequencing table in sequencing choose K power generation node, and according to
Lower formula determines the value of K:
Wherein, PtTo cut machine amount, PiFor active power output, i=1,2,3 ... N, N are the number of power generation node；
Before input excision after the instruction of K power generation node, transient emulation analysis is re-started；
It is analyzed by the transient emulation recalculated as a result, judging that electric system whether there is the feelings of generator rotor angle Transient Instability
Condition；
If it exists the case where generator rotor angle Transient Instability, machine amount is cut in increase, obtain it is new cut machine amount, and return to execution and choose power generation
The operation of node, until the case where generator rotor angle Transient Instability is not present in electric system；
There will be no when generator rotor angle Transient Instability situation to cut machine amount, power generation number of nodes and specific power generation node defeated
Out.
Optionally, machine amount is cut in the determination, comprising:
Fixed step size P is set according to the following formulastep:
Pstep=min (Pi)；
Machine amount P is cut in determination according to the following formulat:
Pt=Pstep。
Optionally, machine amount is cut in the increase, is obtained and new is cut machine amount, comprising:
Enable Pt=Pt+Pstep, by PtCalculated value cut machine amount as new.
Optionally, according to the effective power flow direction in the calculation of tidal current, by electric system be divided into sending and
Receiving-end system, comprising:
According to the effective power flow in the calculation of tidal current, the effective power flow direction of target's center's branch is determined；
In the case where target's center's branch disconnects, according to the effective power flow direction, electric system is divided into and is sent
End system and receiving-end system, wherein the sending is the input terminal in the effective power flow direction, and the receiving-end system is institute
State the output end in effective power flow direction.
The second aspect of the application provides the searcher that a kind of electric system generator rotor angle Transient Instability cuts machine automatically, comprising:
First obtains module, in the case where for occurring generator rotor angle Transient Instability in transient emulation analytic process, obtains electricity
Branch where Force system asynchronous oscillation center, using branch where electric system asynchronous oscillation center as target's center's branch
Road；
Division module, for obtaining calculation of tidal current of the target's center's branch before breaking down, and according to
Electric system is divided into sending and receiving-end system, the sending end system by the effective power flow direction in the calculation of tidal current
It unites to the receiving-end system transmission power；
Second obtains module, for obtaining the power generation node for including in the sending, and obtains each power generation
Set end voltage phase angle and active power output of the node in the calculation of tidal current；
Power generation node sequencing table establishes module, for the size order sequence according to the set end voltage phase angle, establishes hair
Electrical nodes sequencing table includes power generation node, set end voltage phase angle and active power output in the power generation node sequencing table, wherein each
A power generation node is corresponding with the set end voltage phase angle or active power output；
Generate electricity node determining module, cuts machine amount for determination, selects according to the sequencing in the power generation node sequencing table
K power generation node is taken, and determines the value of K according to following formula:
Wherein, PtTo cut machine amount, PiFor active power output, i=1,2,3 ... N, N are the number of power generation node；
It is imitative to re-start transient state after the instruction of K power generation node before input excision for transient emulation analysis module
True analysis；
Judgment module, for the transient emulation analysis by recalculating as a result, judging electric system with the presence or absence of generator rotor angle
The case where Transient Instability；
Loop module, for determining that electric system there are in the case where generator rotor angle Transient Instability, increases in the judgment module
Cut machine amount, obtain it is new cut machine amount, and the operation for executing and choosing power generation node is returned to, until generator rotor angle transient state is not present in electric system
The case where unstability；
Output module cuts machine amount, power generation number of nodes and specific when for will be not present generator rotor angle Transient Instability situation
Power generation node output.
Optionally, the power generation node determining module includes cutting machine amount determination unit, and the machine amount determination unit of cutting is used for
Machine amount is cut in determination, and the machine amount determination unit of cutting includes:
Fixed step size determines subelement, for setting fixed step size P according to the following formulastep:
Pstep=min (Pi)；
The machine amount of cutting determines subelement, cuts machine amount P for determination according to the following formulat:
Pt=Pstep。
Optionally, the loop module include it is new cut machine amount determination unit, the new machine amount determination unit of cutting is used for
Determine electric system there are in the case where generator rotor angle Transient Instability in the judgment module, machine amount is cut in increase, obtain it is new cut machine amount,
The new machine amount determination unit of cutting includes:
New machine amount of cutting determines subelement, for enabling Pt=Pt+Pstep, by PtCalculated value cut machine amount as new.
Optionally, the division module includes division unit, and the division unit is used for according to the calculation of tidal current
In effective power flow direction, electric system is divided into sending and receiving-end system, the division unit includes:
Direction of tide determines subelement, for determining the target according to the effective power flow in the calculation of tidal current
The effective power flow direction of central branches；
Subelement is divided, is used in the case where target's center's branch disconnects, it, will according to the effective power flow direction
Electric system is divided into sending and receiving-end system, wherein the sending is the input terminal in the effective power flow direction, institute
State the output end that receiving-end system is the effective power flow direction.
It from the above technical scheme,, will be electric after obtaining target's center's branch in searching method provided by the present application
Force system sends end system and receiving-end system, improves system stability by accurately cutting off sending unit, avoids artificial
" blindness " of unit is cut in selection, is solved in the prior art by the subjective judgement for calculating analysis personnel, accuracy is lower
The problem of.In addition, searching method provided by the present application can use computer technology realization, calculating analysis efficiency is improved, is solved
It has determined and has expended the time in the prior art and the problem of manpower.Further, the application passes through power generation node generator terminal voltage phase angle row
Sequence, specifies the preferential excision sequence of power generation node, and the machine result of cutting is optimized.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the work for the searching method that a kind of electric system generator rotor angle Transient Instability provided by the embodiments of the present application cuts machine automatically
Make flow chart；
Fig. 2 is sending end provided by the embodiments of the present application and receiving end schematic diagram；
Fig. 3 is electric system line chart provided by the embodiments of the present application；
Fig. 4 is the knot for the searcher that a kind of electric system generator rotor angle Transient Instability provided by the embodiments of the present application cuts machine automatically
Structure schematic diagram.
Specific embodiment
Accuracy is low in method to solve the problem of selection excision generating set, expend the time and manpower, the application mention
Cut the searching method and device of machine automatically for a kind of electric system generator rotor angle Transient Instability.
Work flow diagram shown in referring to Fig.1, it is automatic that the embodiment of the present application provides a kind of electric system generator rotor angle Transient Instability
Cut the searching method of machine, comprising the following steps:
Step 101, in the case where occurring generator rotor angle Transient Instability in transient emulation analytic process, electric system step-out is obtained
Branch where oscillation center, using branch where electric system asynchronous oscillation center as target's center's branch.
In the step, in the case of generator rotor angle Transient Instability, it will usually electric system asynchronous oscillation occur, from analysis software
In branch where available asynchronous oscillation center.
Step 102, calculation of tidal current of the target's center's branch before breaking down is obtained, and according to the tide
Electric system is divided into sending and receiving-end system by the effective power flow direction in stream calculation result, and the sending is to institute
State receiving-end system transmission power.
In the step, transient emulation analysis, which refers to, to be carried out under the premise of a certain fixed trend, that is to say, that in transient state
Before simulation analysis, Load flow calculation is had been carried out in analysis software, and calculation of tidal current is stored in analysis software, passes through click
Operation or input instruction, can obtain calculation of tidal current.
It will according to the effective power flow direction in the calculation of tidal current referring to sending end shown in Fig. 2 and receiving end schematic diagram
Electric system is divided into sending and receiving-end system, comprising the following steps:
Step 1021, according to the effective power flow in the calculation of tidal current, the active of target's center's branch is determined
Direction of tide.
In the step, if the numerical value of effective power flow is positive value, determine the effective power flow direction of target's center's branch with
Sense of current is consistent；If the numerical value of effective power flow is negative value, the effective power flow direction of target's center's branch and electric current
It is contrary.
Step 1022, in the case where target's center's branch disconnects, according to the effective power flow direction, by power train
System is divided into sending and receiving-end system, wherein the sending is the input terminal in the effective power flow direction, the receiving end
System is the output end in the effective power flow direction.
Step 103, the power generation node for including in the sending is obtained, and obtains each power generation node described
Set end voltage phase angle and active power output in calculation of tidal current.
In the step, sending includes one or more generating sets, the corresponding one or more hairs of each generating set
Electrical nodes.Virtual voltage when set end voltage refers to generator operation on generator outlet terminal.Set end voltage phase angle and have
Function power output can obtain in analysis software.
Step 104, it sorts according to the size order of the set end voltage phase angle, establishes power generation node sequencing table, the hair
Include power generation node, set end voltage phase angle and active power output in electrical nodes sequencing table, wherein each power generation node with it is described
Set end voltage phase angle or active power output are corresponding.
In the step, according to the remoter rule of the power generation bigger electrical distance of node phase angle, the preferential electrical distance that cuts off is remote
Unit is conducive to keep the stability of electric system, therefore, sorts, sorts forward according to the size order of set end voltage phase angle
The corresponding generating set of power generation node is preferentially removed.
Step 105, machine amount is cut in determination, chooses K power generation node according to the sequencing in the power generation node sequencing table,
And the value of K is determined according to following formula:
Wherein, PtTo cut machine amount, PiFor active power output, i=1,2,3 ... N, N are the number of power generation node.
In the step, in a kind of achievable mode, machine amount is cut in the determination, comprising the following steps:
Step 1051, fixed step size P is set according to the following formulastep:
Pstep=min (Pi)；
Step 1052, machine amount P is cut in determination according to the following formulat:
Pt=Pstep。
Step 106, before input excision after the instruction of K power generation node, transient emulation analysis is re-started.
Step 107, it is analyzed by the transient emulation recalculated as a result, judging that electric system is lost with the presence or absence of generator rotor angle transient state
Steady situation.
In the step, if the case where electric system still has generator rotor angle Transient Instability, illustrate it is aforementioned cut machine operation be not enough to
Reach generator rotor angle transient stability, executes the operation of step 108 at this time；If the case where generator rotor angle Transient Instability is not present in electric system, say
It is bright to cut machine operation just at the critical state for reaching generator rotor angle transient stability, the operation of step 109 can be performed at this time.
Step 108, if it exists generator rotor angle Transient Instability the case where, machine amount is cut in increase, obtain it is new cut machine amount, and return to execution
The operation of power generation node is chosen, until the case where generator rotor angle Transient Instability is not present in electric system.
In a kind of achievable mode, P is enabledt=Pt+Pstep, by PtCalculated value cut machine amount as new.
Wherein, PstepFor fixed step size, if new machine amount of cutting after returning and executing the operation for choosing power generation node, still
It is unable to reach generator rotor angle transient stability, then is needed in Pt' on the basis of continue to sum it up with fixed step size, obtain it is new cut machine amount, such as
This circulate operation stops circulation when electric system reaches generator rotor angle transient stability, and last time is calculated generator rotor angle transient stability
When cut machine amount, power generation number of nodes and specific power generation node output.
Step 109, there will be no cut machine amount, power generation number of nodes and specific power generation when generator rotor angle Transient Instability situation
Node output.
In the step, the specific node that generates electricity is corresponding with generating set, after finding specific power generation node, can obtain
Know generating set to be cut off.
It from the above technical scheme,, will be electric after obtaining target's center's branch in searching method provided by the present application
Force system sends end system and receiving-end system, improves system stability by accurately cutting off sending unit, avoids artificial
" blindness " of unit is cut in selection, is solved in the prior art by the subjective judgement for calculating analysis personnel, accuracy is lower
The problem of.In addition, searching method provided by the present application can use computer technology realization, calculating analysis efficiency is improved, is solved
It has determined and has expended the time in the prior art and the problem of manpower.Further, the application passes through power generation node generator terminal voltage phase angle row
Sequence, specifies the preferential excision sequence of power generation node, and the machine result of cutting is optimized.
The application is further illustrated below by way of specific embodiment.
Referring to certain simple power system schematic diagram shown in Fig. 3, simulation analysis is carried out using PDS-BPA simulation software.It will
It is analyzed using electric system shown in Fig. 3 as embodiment, the feasibility of the above method is verified by simulation analysis.In Fig. 3,
" collecting E " is transmitted electric power by two loop line road directions " load A " as 2 × 210MW.When collecting the two loop line road E~load A (I, II time)
In I time line fault after, system will lose stabilization, show as sending end power generation one, power generation two, power generation three power station units to infinite
The asynchronous oscillation (transient state generator rotor angle unstability) of big G unit.The following are the power generations that excision is found using searching method provided by the present application
Unit, to keep the process of power system stability.
Step 1 reads central branches where asynchronous oscillation.According to electromechanical transient calculated result, collects E~load A two and return
Route N-1 (occur a failure) generator rotor angle unstability afterwards, asynchronous oscillation center, which is located at, collects E~II loop line of load A road.
Step 2, the effective power flow of branch (collecting E~load A II to return) where reading asynchronous oscillation center are 210MW.It will
Collect E~load A II and return disconnection (collect E~load A I and return failed disconnection), system is divided into two systems at this time.Collect the side E
System transmission power from system to the side load A, therefore collect the side E system be sending, and the system of the side load A be by
End system.
Step 3 obtains all power generation nodes of sending.From figure 3, it can be seen that the power generation node in sending
Have: the 1G that generates electricity, one 2G of power generation, two 1G of power generation, two 2G of power generation, three 1G of power generation, generate electricity three 2G totally 6 units.
Step 4, from the set end voltage phase angle for reading the node that generates electricity in sending in calculation of tidal current, and pressing will be each
Power generation node is sorted from large to small by phase angle, and the active power output and set end voltage phase angle for the node that generates electricity are as shown in Table 1.
The power generation node sequencing table of one sending of table
| Generating set (power generation node) title | Active power output (MW) | Set end voltage mutually spends (degree) |
| Generate electricity a 1G | 85.00 | 33.37 |
| Generate electricity a 2G | 75.00 | 33.09 |
| Generate electricity two 1G | 75.00 | 32.54 |
| Generate electricity two 2G | 65.00 | 32.27 |
| Generate electricity three 1G | 65.00 | 31.72 |
| Generate electricity three 2G | 55.00 | 31.44 |
Step 5 sums 6 unit outputs of sending for 420MW, and minimum unit output is 55MW, and P is arrangedstep=
min(Pi)=55MW, enables Pt=Pstep=55MW chooses K power generation node from front to back from table one, meetsK=1 is calculated, i.e. one 1G of excision power generation.
The instruction of one 1G of excision power generation is added in the transient emulation analysis for carrying out failure, carries out transient state again for step 6
Simulation analysis.
Step 7, it is generator rotor angle Transient Instability that transient emulation, which analyzes result,.Enable Pt=Pt+Pstep=110MW, from table one from
K power generation node is chosen front to back, is metK=2 is calculated, i.e. one 1G of excision power generation, hair
One 2G of electricity.
The instruction of excision power generation one 1G, the 2G that generates electricity is added, again in step 8 in the transient emulation analysis for carrying out failure
Carry out transient emulation analysis.
Step 9, it is generator rotor angle transient stability that transient emulation, which analyzes result, then power system stability can be restored by having found
Cut machine combination: one 1G of excision power generation, one 2G of power generation.
Step 10 terminates simultaneously outputting cutting machine amount 110MW, cuts machine quantity K=2, the generating set specifically cut off: power generation one
1G, one 2G of power generation.
Referring to structural schematic diagram shown in Fig. 4, originally who asks embodiment to provide a kind of electric system generator rotor angle Transient Instability automatic
Cut the searcher of machine, comprising:
First obtains module 100, in the case where for occurring generator rotor angle Transient Instability in transient emulation analytic process, obtains
Branch where electric system asynchronous oscillation center, using branch where electric system asynchronous oscillation center as target's center's branch
Road；
Division module 200, for obtaining calculation of tidal current of the target's center's branch before breaking down, and root
According to the effective power flow direction in the calculation of tidal current, electric system is divided into sending and receiving-end system, the sending end
System is to the receiving-end system transmission power；
Second obtains module 300, for obtaining the power generation node for including in the sending, and obtains each hair
Set end voltage phase angle and active power output of the electrical nodes in the calculation of tidal current；
Power generation node sequencing table establishes module 400, for the size order sequence according to the set end voltage phase angle, establishes
Generate electricity node sequencing table, and power generation node, set end voltage phase angle and active power output are included in the power generation node sequencing table, wherein
Each power generation node is corresponding with the set end voltage phase angle or active power output；
Generate electricity node determining module 500, for determining machine amount of cutting, chooses K power generation node, and determine according to following formula
The value of K:
Wherein, PtTo cut machine amount, PiFor active power output, i=1,2,3 ... N, N are the number of power generation node；
Transient emulation analysis module 600, for according to the sequence in the power generation node sequence table, K to generate electricity before choosing
Node, and before input excision after the instruction of K power generation node, re-start transient emulation analysis；
Judgment module 700, for the transient emulation analysis by recalculating as a result, judging electric system with the presence or absence of function
The case where angle Transient Instability；
Loop module 800, for determining that electric system there are in the case where generator rotor angle Transient Instability, increases in the judgment module
Add and cut machine amount, obtain it is new cut machine amount, and the operation for executing and choosing power generation node is returned to, until there is no generator rotor angle is temporary for electric system
The case where state unstability；
Output module 900 cuts machine amount, power generation number of nodes and tool when for will be not present generator rotor angle Transient Instability situation
The power generation node of body exports.
Optionally, the power generation node determining module includes cutting machine amount determination unit, and the machine amount determination unit of cutting is used for
Machine amount is cut in determination, and the machine amount determination unit of cutting includes:
Fixed step size determines subelement, for setting fixed step size P according to the following formulastep:
Pstep=min (Pi)；
The machine amount of cutting determines subelement, cuts machine amount P for determination according to the following formulat:
Pt=Pstep。
Optionally, the loop module include it is new cut machine amount determination unit, the new machine amount determination unit of cutting is used for
Determine electric system there are in the case where generator rotor angle Transient Instability in the judgment module, machine amount is cut in increase, obtain it is new cut machine amount,
The new machine amount determination unit of cutting includes:
New machine amount of cutting determines subelement, for enabling Pt=Pt+Pstep, by PtCalculated value cut machine amount as new.
Optionally, the division module includes division unit, and the division unit is used for according to the calculation of tidal current
In effective power flow direction, electric system is divided into sending and receiving-end system, the division unit includes:
Direction of tide determines subelement, for determining the target according to the effective power flow in the calculation of tidal current
The effective power flow direction of central branches；
Subelement is divided, is used in the case where target's center's branch disconnects, it, will according to the effective power flow direction
Electric system is divided into sending and receiving-end system, wherein the sending is the input terminal in the effective power flow direction, institute
State the output end that receiving-end system is the effective power flow direction.
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present invention substantially or
Say that the part that contributes to existing technology can be embodied in the form of software products, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that computer equipment (can be with
It is personal computer, server or the network equipment etc.) execute certain part institutes of each embodiment of the present invention or embodiment
The method stated.
Same and similar part may refer to each other between each embodiment in this specification.Implement especially for device
For example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring in embodiment of the method
Explanation.
Combine detailed description and exemplary example that the application is described in detail above, but these explanations are simultaneously
It should not be understood as the limitation to the application.It will be appreciated by those skilled in the art that without departing from the application spirit and scope,
A variety of equivalent substitution, modification or improvements can be carried out to technical scheme and embodiments thereof, these each fall within the application
In the range of.The protection scope of the application is determined by the appended claims.
Claims (8)
1. the searching method that a kind of electric system generator rotor angle Transient Instability cuts machine automatically characterized by comprising
In the case where occurring generator rotor angle Transient Instability in transient emulation analytic process, electric system asynchronous oscillation center place is obtained
Branch, using branch where electric system asynchronous oscillation center as target's center's branch；
Calculation of tidal current of the target's center's branch before breaking down is obtained, and according in the calculation of tidal current
Effective power flow direction, electric system is divided into sending and receiving-end system, the sending is defeated to the receiving-end system
Send power；
The power generation node for including in the sending is obtained, and obtains each power generation node in the calculation of tidal current
In set end voltage phase angle and active power output；
It sorts according to the size order of the set end voltage phase angle, establishes power generation node sequencing table, the power generation node sequencing table
In include power generation node, set end voltage phase angle and active power output, wherein each power generation node and the set end voltage phase angle
Or active power output is corresponding；
Machine amount is cut in determination, chooses K power generation node according to the sequencing in the power generation node sequencing table, and according to following public affairs
Formula determines the value of K:
Wherein, PtTo cut machine amount, PiFor active power output, i=1,2,3 ... N, N are the number of power generation node；
Before input excision after the instruction of K power generation node, transient emulation analysis is re-started；
It is analyzed by the transient emulation recalculated as a result, judging the case where electric system is with the presence or absence of generator rotor angle Transient Instability；
If it exists the case where generator rotor angle Transient Instability, machine amount is cut in increase, obtain it is new cut machine amount, and return to execution and choose power generation node
Operation, until electric system be not present generator rotor angle Transient Instability the case where；
There will be no cut machine amount, power generation number of nodes and specific power generation node output when generator rotor angle Transient Instability situation.
2. searching method according to claim 1, which is characterized in that machine amount is cut in the determination, comprising:
Fixed step size P is set according to the following formulastep:
Pstep=min (Pi)；
Machine amount P is cut in determination according to the following formulat:
Pt=Pstep。
3. searching method according to claim 2, which is characterized in that machine amount is cut in the increase, is obtained and new is cut machine amount, packet
It includes:
Enable Pt=Pt+Pstep, by PtCalculated value cut machine amount as new.
4. searching method according to claim 1, which is characterized in that according to the effective power flow in the calculation of tidal current
Electric system is divided into sending and receiving-end system by direction, comprising:
According to the effective power flow in the calculation of tidal current, the effective power flow direction of target's center's branch is determined；
In the case where target's center's branch disconnects, according to the effective power flow direction, electric system is divided into sending end system
System and receiving-end system, wherein the sending is the input terminal in the effective power flow direction, and the receiving-end system has to be described
The output end of function direction of tide.
5. the searcher that a kind of electric system generator rotor angle Transient Instability cuts machine automatically characterized by comprising
First obtains module, in the case where for occurring generator rotor angle Transient Instability in transient emulation analytic process, obtains power train
Branch where system asynchronous oscillation center, using branch where electric system asynchronous oscillation center as target's center's branch；
Division module, for obtaining calculation of tidal current of the target's center's branch before breaking down, and according to described
Electric system is divided into sending and receiving-end system by the effective power flow direction in calculation of tidal current, the sending to
The receiving-end system transmission power；
Second obtains module, for obtaining the power generation node for including in the sending, and obtains each power generation node
Set end voltage phase angle and active power output in the calculation of tidal current；
Power generation node sequencing table establishes module, for the size order sequence according to the set end voltage phase angle, establishes power generation section
Sequencing table is put, includes power generation node, set end voltage phase angle and active power output in the power generation node sequencing table, wherein Ge Gesuo
It is corresponding with the set end voltage phase angle or active power output to state power generation node；
Generate electricity node determining module, cuts machine amount for determination, chooses K according to the sequencing in the power generation node sequencing table
Generate electricity node, and the value of K is determined according to following formula:
Wherein, PtTo cut machine amount, PiFor active power output, i=1,2,3 ... N, N are the number of power generation node；
Transient emulation analysis module re-starts transient emulation point after the instruction of K power generation node before input excision
Analysis；
Judgment module, for the transient emulation analysis by recalculating as a result, judging electric system with the presence or absence of generator rotor angle transient state
The case where unstability；
Loop module, for determining electric system there are in the case where generator rotor angle Transient Instability in the judgment module, machine is cut in increase
Amount, obtain it is new cut machine amount, and the operation for executing and choosing power generation node is returned to, until generator rotor angle Transient Instability is not present in electric system
The case where；
Output module cuts machine amount, power generation number of nodes and specific hair when for will be not present generator rotor angle Transient Instability situation
Electrical nodes output.
6. searcher according to claim 5, which is characterized in that the power generation node determining module is true including cutting machine amount
Order member, it is described cut machine amount determination unit for determination cut machine amount, the machine amount determination unit of cutting includes:
Fixed step size determines subelement, for setting fixed step size P according to the following formulastep:
Pstep=min (Pi)；
The machine amount of cutting determines subelement, cuts machine amount P for determination according to the following formulat:
Pt=Pstep。
7. searcher according to claim 6, which is characterized in that the loop module includes that new machine amount of cutting determines list
Member, the new machine amount determination unit of cutting is for the case where the judgment module determines electric system there are generator rotor angle Transient Instabilities
Under, machine amount is cut in increase, obtain it is new cut machine amount, the new machine amount determination unit of cutting includes:
New machine amount of cutting determines subelement, for enabling Pt=Pt+Pstep, by PtCalculated value cut machine amount as new.
8. searcher according to claim 5, which is characterized in that the division module includes division unit, and described stroke
Sub-unit is used to that electric system to be divided into sending and receiving end system according to the effective power flow direction in the calculation of tidal current
System, the division unit include:
Direction of tide determines subelement, for determining the target's center according to the effective power flow in the calculation of tidal current
The effective power flow direction of branch；
Subelement is divided, is used in the case where target's center's branch disconnects, according to the effective power flow direction, by electric power
System is divided into sending and receiving-end system, wherein the sending be the effective power flow direction input terminal, it is described by
End system is the output end in the effective power flow direction.
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