CN102982230B - A kind of short circuit current based on node impedance sensitivity exceeds standard aid decision-making method - Google Patents
A kind of short circuit current based on node impedance sensitivity exceeds standard aid decision-making method Download PDFInfo
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Abstract
The present invention provides a kind of short circuit current based on node impedance sensitivity to exceed standard aid decision-making method, comprise the following steps: obtain online data or offline mode data, and obtain the annexation of physics bus, set electrical network scope, breaking current and reduction short circuit current measure priority；Calculate open-circuit voltage and the short circuit current of trouble point, determine that the short circuit current in the range of electrical network exceeds standard a little, and it is alerted；For the bus that exceeds standard, search reduces short circuit current measure；Calculate the node impedance sensitivity of each reduction short circuit current measure, and be ranked up reducing short circuit current measure；Generate short circuit current to exceed standard aid decision, and the aid decision that exceeds standard short circuit current verifies.The present invention realizes based on the current limiting measures changing electric network composition, if there is short circuit current excessive problem under the current method of operation, then automatically analyzes the running status of the plant stand mode of connection, circuit and unit, provides aid decision suggestion.
Description
Technical field
The invention belongs to electric system simulation and computational analysis technical field, be specifically related to a kind of based on node impedance sensitivity short
Road electric current exceeds standard aid decision-making method.
Background technology
Short circuit refer to all abnormal between phase and phase or phase and ground (for system of neutral ground) occur path in the case of.
The properly functioning destruction of power system is caused by short trouble mostly.When being short-circuited, system from a kind of state drastic change to separately
A kind of state, and supervene the transition effect of complexity.The main cause of generation short circuit: (1) element rupture, such as insulant
Natural aging, design, install and equipment deficiency that imperfect maintenance is brought develops into short circuit.(2) meteorological condition deteriorates, as
The flashover that thunderbolt causes discharges or lightning arrestor movement.(3) human accident, such as on-load broaching tool lock.(4) other, as ditching damage
Hindering cable, birds and beasts is connected across exposed current carrying part.
The harm of short circuit mainly has the following aspects: (1) short trouble makes to occur in the branch road near short dot bigger than normal value
The electric current of manyfold, due to the dynamo-electric effect of short circuit current, by producing the biggest mechanical stress between conductor, may make conductor prop up
Frame destroys and makes accident expand further.(2), when short circuit duration is longer, equipment may be overheated so that damaging.(3) system during short circuit
System voltage declines to a great extent, the biggest to customer impact.(4) when the persistent period is longer from power supply is not far for short circuit generation point, side by side
The electromotor run may lose synchronization, causes large areas to have a power failure, and this is short circuit severest consequences.
Short circuit calculation is exactly under certain fault, obtains and flows through short dot and the fault current of each branch road, each busbar voltage of the whole network
Calculate.The purpose of short circuit calculation: in power system and the design of electrical equipment and running, short circuit calculation is to solve a series of skills
The art indispensable basic calculating of problem, is mainly used in:
(1) electrical equipment having enough mechanical stabilities and heat stability is selected.
(2) various relay protection and automaton its parameter of correctly adjusting are configured.
(3) when designing and select power plant and power system main electrical scheme, in order to compare the wiring diagram of different schemes, it is determined whether need
The measure of limiting short-circuit current to be taked.
(4) when carrying out multilayer output feedback network, the research short circuit impact on user job.
The conventional method of calculation of short-circuit current is: utilize symmetrical component method to realize ABC system and positive and negative zero sequence system Parameters Transformation；
List positive and negative, zero-sequence network equation；Derive the boundary condition equation of trouble point；Network equation is joined with boundary condition equation
Stand and solve, obtain short circuit current and other components.
Along with developing rapidly of national economy and improving constantly of living standards of the people, the demand of electric power is also continuously increased by society,
Thus driven the development of power system.Owing to electrical network scale constantly expands, generating set capacity, station capacity and change
Depressor capacity is continuously increased and the sustainable growth of down town load density, and the contact of electrical network is increasingly tightr, many regions electricity
The short circuit current level of net particularly developed regions electrical network has approached the maximum rupturing capacity of even more than chopper, need to take
Effect measure limits.In actual motion, due to reasons such as new equipment operation, voltage levvl changes so that planning or
The rated rupturing capacity of chopper may be exceeded already close to the bus of the limit and the short circuit current of circuit during design.In the past, pressed
Check the short circuit current of each point according to maximum short circuit current calculating principle, when finding to exceed standard, the experience by method of operation personnel is artificial
Change electric network composition, generate the multiple method of operation and carry out limiting short-circuit current, from this multiple method of operation, filter out several feasible side
Case.This work manually arranging power system operating mode is time-consuming, effort, high and can not consider whole to staff requirement
Feasible program.
On the other hand, the data carrying out calculation of short-circuit current at current operating mode are all off-line datas, these data and current electricity
The method of operation of net is different, and the off-line data used based on mode is the operating condition that cannot analyze current electric grid.Therefore,
Online data is derived calculated off line data form, and carries out simulation analysis based on online data and more can approach the operation of current electric grid
Operating mode.Use short circuit current based on online data and aid decision the most necessary at the method for operation.
Along with the fast development of interconnection power system, technical merit and the complexity of electrical network are more and more higher, are especially in the presence of electromagnetism
Looped network, grid short circuit levels of current increases the most day by day, and grid short circuit electric current excessive problem has become each department electrical network and run in recent years
One of distinct issues, the short circuit current excessive problem of especially more than 220kV electrical network.Grid short circuit levels of current exceeds standard and asks
Topic, not only threatens the safe and stable operation of system, and directly affects the economy of operation of power networks.Solve short circuit current problem
Having both direction, one is directly to change primary equipment, and two is the measure taking limiting short-circuit current.Replacing primary equipment is applicable to
The situation that partial short-circuit electric current is excessive, when whole system short circuit current level improves, changes the very expensive of primary equipment, this
Time be considered as taking the measure of limiting short-circuit current, changing electric network composition is effective method.Change electric network composition to limit
The method of short circuit current mainly has: cut-offs circuit, bus fanout operation, jump logical circuit, partition running etc., current said method
Being to carry out limiting short-circuit current by manually adjusting electric network composition mostly, it is the most rare that Automatic Program realizes.These work completely may be used
To be realized by computer, part artificial experience is combined sensitive analysis and filters out the measure of various limiting short-circuit current, root
Automatically generate the method for operation of electrical network according to the current limiting measures generated, and carry out trend and short circuit current is checked and finally determined effective limit
Stream measure.The most also there is no the correlational study of short circuit current aid decision.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of short circuit current based on node impedance sensitivity to exceed standard auxiliary
Help decision method, realize based on the current limiting measures changing electric network composition, exceed standard ask if there is short circuit current under the current method of operation
Topic, then automatically analyze the running status of the plant stand mode of connection, circuit and unit under the current method of operation, be given to draw and stop circuit, bus
The aid decision suggestions such as split operation or stoppage in transit electromotor.
It can be found that there is short circuit current excessive problem in the real time operation mode that EMS state estimation provides, for there is short circuit current
The method of operation exceeded standard carries out aid decision calculating, and provides aid decision to advise in time to dispatching of power netwoks personnel.
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that:
There is provided a kind of short circuit current based on node impedance sensitivity to exceed standard aid decision-making method, said method comprising the steps of:
Step 1: acquisition online data or offline mode data, and obtain the annexation of physics bus, setting electrical network scope,
Breaking current and reduction short circuit current measure priority；
Step 2: calculate open-circuit voltage and the short circuit current of trouble point, determine that the short circuit current in the range of electrical network exceeds standard a little, and right
Short circuit current exceeds standard and a little alerts；
Step 3: for the bus that exceeds standard, search reduces short circuit current measure；
Step 4: calculate the node impedance sensitivity of each reduction short circuit current measure, and according to reducing the node of short circuit current measure
Impedance sensitivity and priority are ranked up reducing short circuit current measure；
Step 5: generate short circuit current and exceed standard aid decision, and the aid decision that exceeds standard short circuit current verifies.
Described step 2 comprises the following steps:
Step 2-1: calculate open-circuit voltage and the short circuit current of trouble point；Detailed process is as follows:
Symmetrical component method is utilized to realize ABC system and positive and negative zero sequence system Parameters Transformation；List positive and negative, zero-sequence network equation；
Derive the boundary condition equation of trouble point；By network equation and boundary condition equation simultaneous solution, obtain the event respectively of the whole network bus
In the case of barrier, flow through open-circuit voltage and the short circuit current of trouble point；
Step 2-2: if the short circuit current I of all buses in meeting set pointSCBusBreaking current more than trouble point short circuit current
Ibc, i.e. can determine that this trouble point is that electric current exceeds standard a little, and short circuit current is exceeded standard a little alert.
The open-circuit voltage expression formula of described trouble point is:
Wherein:
For the open-circuit voltage of trouble point, E is the equivalent electromotive force of system generator reactance after-potential；Δ V is load current
Cause by the pressure drop of potential source to trouble point；VcThe trouble point open circuit voltage variations value caused for various compensation, circuit B/2,
Generally its gross effect is capacitive, and it is generally higher than 0；
The short circuit current expression formula of described trouble point is:
Wherein, IfFor the short circuit current of trouble point, VoFor the open-circuit voltage of trouble point, X1System positive sequence equivalence for trouble point hinders
Anti-.
Described open-circuit voltage and calculating of short circuit current support that synchro generator model, the motor that can set ratio and constant-impedance are combined
Model, π type Type Equivalent Circuit Model, two-winding transformer model and three-winding transformer model.
In described step 3, reduce short circuit current measure and include:
1) draw and stop circuit: on the premise of not having a strong impact on system reliability, draw and stop some circuit, increase the equivalent impedance of electrical network,
Suppression short circuit current；
2) bus splitting: open bar coupler, makes transformator split operation, can increase system impedance, reduces short
Road electric current；
3) 500kV circuit goes out string operation: i.e. when plant stand 500kV side uses the mode of connection of one-and-half breaker, the company of employing
The chopper connecing two side bus disconnects, middle breaker closing, increases system impedance, reduces short circuit current；
4) stoppage in transit electromotor: electromotor provides the size of short circuit current to depend on its set end voltage and its transfger impedance to short dot,
Reduce short circuit current.
In described step 4: use parallel computing platform to carry out task distribution and scheduling to reducing short circuit current measure, and then calculate
Node impedance sensitivity, and be ranked up according to the node impedance sensitivity and priority reducing short circuit current measure；
Described parallel computing platform is formed with calculating node server by managing node server, uses and is suitable for Power System Analysis meter
The parallel computing of calculation feature realizes；Management node carry out data exchange, calculate task scheduling, result reclaim collect and calculate
Software interface；Calculate node and environment and the control of parallel computation are provided for all kinds of calculation procedure.
Reduction short circuit current measure is carried out described parallel computing platform task distribution and scheduling process is as follows:
1) parallel computing platform uses predistribution task management policy preferential, that dynamically distribution supplements, according to different parallel computations
Need to select appropriate scheduling mechanism, improve communication efficiency and the speed of overall parallel computation of system；
2) parallel computing platform uses UDP/IP physics, logical multicast and unicast technique, it is achieved reliable efficient internal data is led to
Letter mechanism, it is provided that in platform, the data of cross-node exchange and integrated service；
3) parallel computing platform uses the mechanism of Time-sharing control, and all kinds of calculating tasks carry out orderly management, simplifies calculating task
Scheduling, it is ensured that the accuracy of result of calculation transmission and integrity, improves stability and the work efficiency of system；
4) parallel computing platform provides the parallelization interface of standard, it is ensured that software for calculation can conveniently realize self and calculate task also
Rowization processes, and platform should provide the parallelization interface that task predistribution and task dynamically distribute two ways, it is ensured that the task that realizes is adjusted
Degree and parallel computation.
According to the power system operating mode data being newly formed, calculate nodal impedance matrix, and calculate node impedance sensitivity, described joint
Point impedance sensitivity is characterized as the self-impedance amplitude front with grid structure change of the variable quantity of self-impedance amplitude before and after grid structure changes
Ratio, its expression formula is:
Wherein, λiiExceed standard node impedance sensitivity a little for adjusting short circuit current after rack, ZiiExceed standard a little before adjusting for grid structure
Self-impedance, Z 'iiThe self-impedance exceeded standard a little after adjusting for grid structure；λiiThe biggest, represent that grid structure exceeds standard a little after adjusting
It is the most that short circuit current reduces.
The node impedance sensitivity respectively user's setting reducing short circuit current measure priority and each reduction short circuit current measure is taken advantage of
With corresponding weight and sue for peace, obtain the coefficient of efficiency of all reduction short circuit current measures, according to coefficient of efficiency from big to small to fall
Low short circuit current measure is ranked up.
In described step 5, reduce short circuit current measure according to node impedance sensitivity screening, and to the reduction short circuit electricity after screening
Stream measure is combined, and generates short circuit current and exceeds standard aid decision, and the short circuit current in aid decision that short circuit current is exceeded standard,
Thermally-stabilised and transient stability verifies.
Compared with prior art, the beneficial effects of the present invention is:
1. propose and a kind of be used uniformly across node impedance sensitivity for multiple current limiting measures and quickly calculate what short circuit current exceeded standard
Aid decision-making method, is that the bus under the real time operation mode providing EMS state estimation carries out Analysis of Short-Circuit Current, if deposited
Then start short circuit current aid decision in short circuit current excessive problem to calculate, it is ensured that the security and stability of electrical network real time execution.This merit
Can guarantee that when the method for operation is continually changing, find potential short circuit current excessive problem and provide auxiliary in time to dispatching of power netwoks personnel
Decision recommendation.This requires that short circuit current aid decision wants fast in line computation speed, and the decision information be given is simple and feasible, will not carry
Carry out other safety and stability problem；
2. under actual electric network data, carry out calculation of short-circuit current, node impedance sensitive analysis and the research of aid decision and trial,
Finding out a kind of short circuit current to exceed standard the method for aid decision, the method can carry out short circuit current emulation meter to real time operation mode
Calculate, the excessive problem being likely to occur is alerted, carry out electric network composition adjustment according to node impedance sensitivity and effectively limit
Short circuit current exceeds standard, and provides aid decision, eliminates the potential safety hazard that system exists in time, instructs the adjustment of the method for operation, right
Safe and stable operation in electrical network has great significance；
3. automatically carry out electric network composition adjustment due to this method, it is not necessary to the participation of a large amount of manpowers, it is not required that very professional people
Member carries out short circuit current adjustment, calculates speed and is also obviously improved, and effectively solves tradition limiting short-circuit current ways of carrying out and adjusts
Need a large amount of manpower, dependence experience, the calculating slow and inefficient problem of speed during calculating, there are popularization and application widely
Prospect.
Accompanying drawing explanation
Fig. 1 is that short circuit current based on node impedance sensitivity exceeds standard aid decision-making method flow chart.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Such as Fig. 1, it is provided that a kind of short circuit current based on node impedance sensitivity exceeds standard aid decision-making method, described method include with
Lower step:
Step 1: acquisition online data or offline mode data, and obtain the annexation of physics bus, setting electrical network scope,
Breaking current and reduction short circuit current measure priority；
Step 2: calculate open-circuit voltage and the short circuit current of trouble point, determine that the short circuit current in the range of electrical network exceeds standard a little, and right
Short circuit current exceeds standard and a little alerts；
Step 3: for the bus that exceeds standard, search reduces short circuit current measure；
Step 4: calculate the node impedance sensitivity of each reduction short circuit current measure, and according to reducing the node of short circuit current measure
Impedance sensitivity and priority are ranked up reducing short circuit current measure；
Step 5: generate short circuit current and exceed standard aid decision, and the aid decision that exceeds standard short circuit current verifies.
Described step 2 comprises the following steps:
Step 2-1: calculate open-circuit voltage and the short circuit current of trouble point；Detailed process is as follows:
Symmetrical component method is utilized to realize ABC system and positive and negative zero sequence system Parameters Transformation；List positive and negative, zero-sequence network equation；
Derive the boundary condition equation of trouble point；By network equation and boundary condition equation simultaneous solution, obtain the event respectively of the whole network bus
In the case of barrier, flow through open-circuit voltage and the short circuit current of trouble point；
Step 2-2: if the short circuit current I of all buses in meeting set pointSCBusBreaking current more than trouble point short circuit current
Ibc, i.e. can determine that this trouble point is that electric current exceeds standard a little, and short circuit current is exceeded standard a little alert.
The open-circuit voltage expression formula of described trouble point is:
Wherein:
For the open-circuit voltage of trouble point, E is the equivalent electromotive force of system generator reactance after-potential；Δ V is load current
Cause by the pressure drop of potential source to trouble point；VcThe trouble point open circuit voltage variations value caused for various compensation, circuit B/2,
Generally its gross effect is capacitive, and it is generally higher than 0；
The short circuit current expression formula of described trouble point is:
Wherein, IfFor the short circuit current of trouble point, VoFor the open-circuit voltage of trouble point, X1System positive sequence equivalence for trouble point hinders
Anti-.
Described open-circuit voltage and calculating of short circuit current support that synchro generator model, the motor that can set ratio and constant-impedance are combined
Model, π type Type Equivalent Circuit Model, two-winding transformer model and three-winding transformer model.
In described step 3, reduce short circuit current measure and include:
1) draw and stop circuit: on the premise of not having a strong impact on system reliability, draw and stop some circuit, increase the equivalent impedance of electrical network,
Suppression short circuit current；
2) bus splitting: open bar coupler, makes transformator split operation, can increase system impedance, reduces short
Road electric current；
3) 500kV circuit goes out string operation: i.e. when plant stand 500kV side uses the mode of connection of one-and-half breaker, the company of employing
The chopper connecing two side bus disconnects, middle breaker closing, increases system impedance, reduces short circuit current；
4) stoppage in transit electromotor: electromotor provides the size of short circuit current to depend on its set end voltage and its transfger impedance to short dot,
Reduce short circuit current.
In described step 4: use parallel computing platform to carry out task distribution and scheduling to reducing short circuit current measure, and then calculate
Node impedance sensitivity, and be ranked up according to the node impedance sensitivity and priority reducing short circuit current measure.
Described parallel computing platform is formed with calculating node server by managing node server, uses and is suitable for Power System Analysis meter
The parallel computing of calculation feature realizes；Management node carry out data exchange, calculate task scheduling, result reclaim collect and calculate
Software interface；Calculate node and environment and the control of parallel computation are provided for all kinds of calculation procedure.
Reduction short circuit current measure is carried out described parallel computing platform task distribution and scheduling process is as follows:
1) parallel computing platform uses predistribution task management policy preferential, that dynamically distribution supplements, according to different parallel computations
Need to select appropriate scheduling mechanism, improve communication efficiency and the speed of overall parallel computation of system；
2) parallel computing platform uses UDP/IP physics, logical multicast and unicast technique, it is achieved reliable efficient internal data is led to
Letter mechanism, it is provided that in platform, the data of cross-node exchange and integrated service；
3) parallel computing platform uses the mechanism of Time-sharing control, and all kinds of calculating tasks carry out orderly management, simplifies calculating task
Scheduling, it is ensured that the accuracy of result of calculation transmission and integrity, improves stability and the work efficiency of system；
4) parallel computing platform provides the parallelization interface of standard, it is ensured that software for calculation can conveniently realize self and calculate task also
Rowization processes, and platform should provide the parallelization interface that task predistribution and task dynamically distribute two ways, it is ensured that the task that realizes is adjusted
Degree and parallel computation.
Reducing short circuit current measure is nothing but by adjusting the grid structure of the electrical network electrical link with suitably minimizing network, i.e. reducing
Each power supply is to the impedance of short dot, and this is to reduce one of effective method of short circuit current level.Certainly the resistance of nodal impedance matrix
Anti-then be the impedance to short dot of power supply, the impedance variation that adjustment electric network composition causes all can reflect nodal impedance matrix.From
Impedance matrix level analysis, draws in electrical network and stops circuit and stoppage in transit electromotor, is equivalent to reduce even on the basis of former network impedance matrix
, the self-impedance of all websites can be increased, so that the short circuit current of all websites has decline in various degree；On the contrary, electrical network
Middle connection circuit, is equivalent to increase chord on the basis of former network impedance matrix, can reduce the self-impedance of all websites, so that
The short circuit current of all websites has rising in various degree, along with the increase of system loading, also can constantly put into new in system
Equipment, in the input meeting constantly minimizing system of these equipment, the self-impedance of all websites, makes the short circuit current of all websites have not
With the rising of degree, some website then there will be the phenomenon that short circuit current exceeds standard.
Short circuit current is the ratio of the node voltage of instantaneous short circuit point and the self-impedance of short dot before short circuit, such as 1) short circuit current meter
Shown in the short circuit current formula calculated and exceed standard in alarm, either change or increase primary equipment and still change electric network composition and be all
Short circuit current level is effectively reduced by increasing short-circuit impedance.For ten thousand node level large scale electric networks, the electric network composition of local
In the case of change is little, VoBeing basically unchanged, the self-impedance change of the website that therefore exceeds standard after grid structure change has reacted short completely
The situation of change of road electric current.
According to the power system operating mode data being newly formed, calculate nodal impedance matrix, and calculate node impedance sensitivity, described joint
Point impedance sensitivity is characterized as the self-impedance amplitude front with grid structure change of the variable quantity of self-impedance amplitude before and after grid structure changes
Ratio, its expression formula is:
Wherein, λiiExceed standard node impedance sensitivity a little for adjusting short circuit current after rack, ZiiExceed standard a little before adjusting for grid structure
Self-impedance, Z 'iiThe self-impedance exceeded standard a little after adjusting for grid structure；λiiThe biggest, represent that grid structure exceeds standard a little after adjusting
It is the most that short circuit current reduces.
The node impedance sensitivity respectively user's setting reducing short circuit current measure priority and each reduction short circuit current measure is taken advantage of
With corresponding weight and sue for peace, obtain the coefficient of efficiency of all reduction short circuit current measures, according to coefficient of efficiency from big to small to fall
Low short circuit current measure is ranked up.
In described step 5, reduce short circuit current measure according to node impedance sensitivity screening, and to the reduction short circuit electricity after screening
Stream measure is combined, and generates short circuit current and exceeds standard aid decision, and the short circuit current in aid decision that short circuit current is exceeded standard,
Thermally-stabilised and transient stability verifies.
Short circuit current verifies: guarantee the strategy chosen can effective limiting short-circuit current, and provide the mother after current limiting measures enforcement
Line calculation of short-circuit current value, i.e. applies I after current limiting measuresSCBus<Ibc；
Heat-stable entertoxin: guarantee that the method for operation after applying current limiting measures does not exist new thermally-stabilised problem；
Transient stability verifies: guarantee that the method for operation after applying current limiting measures does not exist new transient stability problem；
If meeting the requirement of above-mentioned three aspects, this strategy is the optimal strategy reducing short circuit current；If be unsatisfactory for, then choose
The reduction short circuit current measure that sensitivity is less, then carry out above-mentioned verification, till meeting requirement.
Generate the short circuit current aid decision that exceeds standard and have a following two measure:
1) in view of reducing amount of calculation, and making the result of adjustment more rationally, the preferential limiting short-circuit current using user to specify is arranged
Execute, user may specify each website the out-of-limit situation of short circuit current occurs after adjustable strategies, according to the priority of adjustable strategies, give
Go out the short circuit current situation of every kind or several adjustable strategies.
2) if user is not provided that concrete adjustable strategies, then conventional measures for limiting short-circuit current is used (to be only limitted to adjust net
Network structure), such as: stoppage in transit electromotor, draw and stop circuit, bus splitting (bus split of the plant stand that exceeds standard), 500kV factory
Station track road goes out string and runs, and determines the priority of restriction.
The present invention has a characteristic that
(1) calculation of short-circuit current: carry out quick short circuit current scanning based on online data, provides the short circuit electricity of all buses
Flow horizontal.
(2) short circuit current exceeds standard auto-alarming: according to the short circuit current limit value of each bus, automatic screening short circuit current exceeds standard
Bus, and provide alarm.
(3) impedance sensitivity analysis: analyze short circuit current and exceed standard the electric network composition near bus, calculate various electric network composition and become
The impedance sensitivity changed.
(4) parallel computing being suitable for Electrical power system analysis and computing feature is used to realize the quick of short circuit current aid decision
Calculate, reclaim, including data exchange, calculating task scheduling, result, functions such as collecting；
(5) short circuit current aid decision: according to impedance sensitivity analysis result, carries out short circuit current current limliting Adjustable calculation, raw
Become various reduction short circuit current measure (including combination measure), and carry out trend, hot steady and transient stability verifying work, finally give
Go out feasible reduction short circuit current measure.
Embodiment
This method is applied in early warning system in the assessment of certain regional power grid safety on line.This electrical network comprises 6 provincial power networks.
The online data that simulation calculation uses is the real time execution being provided Data of State Estimation to generate after online data is integrated by EMS
Mode data.These data are carried out calculation of short-circuit current, and provides short circuit current and exceed standard warning；Then short circuit current is exceeded standard a little
Carry out node impedance sensitive analysis, generate the reduction short circuit current measure with operability according to sensitive analysis result；?
Reduction short circuit current measure to generating verifies afterwards, and provides decision-making assistant information.
Being analyzed result of calculation, the short circuit current of the generation decision-making assistant information that exceeds standard can effectively reduce short circuit current, and energy
Meet the operation requirement of management and running.
This method carries out calculation of short-circuit current, impedance sensitivity analysis and the research of aid decision and trial under actual electric network data,
Finding out a kind of short circuit current to exceed standard aid decision-making method, the method can carry out short circuit current simulation calculation to real time operation mode,
The excessive problem being likely to occur is alerted, carries out electric network composition adjustment according to impedance sensitivity and be effectively reduced short circuit current
Exceed standard, and provide aid decision, eliminate the potential safety hazard that system exists in time, instruct the adjustment of the method for operation.Due to this method
Automatically electric network composition adjustment is carried out, it is not necessary to the participation of a large amount of manpowers, it is not required that very professional personnel carry out short circuit current tune
Whole, calculate speed and be also obviously improved, effectively solve during tradition limiting short-circuit current ways of carrying out adjusts and calculates and need
A large amount of manpowers, dependence experience, the calculating slow and inefficient problem of speed, have popularizing application prospect widely.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although reference
The present invention has been described in detail by above-described embodiment, those of ordinary skill in the field it is understood that still can to this
Invention detailed description of the invention modify or equivalent, and without departing from spirit and scope of the invention any amendment or etc.
With replacing, it all should be contained in the middle of scope of the presently claimed invention.
Claims (8)
1. a short circuit current based on node impedance sensitivity exceeds standard aid decision-making method, it is characterised in that: described method includes
Following steps:
Step 1: acquisition online data or offline mode data, and obtain the annexation of physics bus, setting electrical network scope,
Breaking current and reduction short circuit current measure priority；
Step 2: calculate open-circuit voltage and the short circuit current of trouble point, determine that the short circuit current in the range of electrical network exceeds standard a little, and right
Short circuit current exceeds standard and a little alerts；
Step 3: for the bus that exceeds standard, search reduces short circuit current measure；
Step 4: calculate the node impedance sensitivity of each reduction short circuit current measure, and according to reducing the node of short circuit current measure
Impedance sensitivity and priority are ranked up reducing short circuit current measure；
Step 5: generate short circuit current and exceed standard aid decision, and the aid decision that exceeds standard short circuit current verifies；
Described step 2 comprises the following steps:
Step 2-1: calculate open-circuit voltage and the short circuit current of trouble point；Detailed process is as follows:
Symmetrical component method is utilized to realize ABC system and positive and negative zero sequence system Parameters Transformation；List positive and negative, zero-sequence network equation；
Derive the boundary condition equation of trouble point；By network equation and boundary condition equation simultaneous solution, obtain the event respectively of the whole network bus
In the case of barrier, flow through open-circuit voltage and the short circuit current of trouble point；
Step 2-2: if the short circuit current I of all buses in meeting set pointSCBusBreaking current more than trouble point short circuit current
Ibc, i.e. can determine that this trouble point is that electric current exceeds standard a little, and short circuit current is exceeded standard a little alert.
Short circuit current based on node impedance sensitivity the most according to claim 1 exceeds standard aid decision-making method, and its feature exists
In: described open-circuit voltage and calculating of short circuit current support that synchro generator model, the motor that can set ratio and constant-impedance are combined
Model, π type Type Equivalent Circuit Model, two-winding transformer model and three-winding transformer model.
Short circuit current based on node impedance sensitivity the most according to claim 1 exceeds standard aid decision-making method, and its feature exists
In: in described step 3, reduce short circuit current measure and include:
1) draw and stop circuit: on the premise of not having a strong impact on system reliability, draw and stop some circuit, increase the equivalent impedance of electrical network,
Suppression short circuit current；
2) bus splitting: open bar coupler, makes transformator split operation, can increase system impedance, reduces short
Road electric current；
3) 500kV circuit goes out string operation: i.e. when plant stand 500kV side uses the mode of connection of one-and-half breaker, the company of employing
The chopper connecing two side bus disconnects, middle breaker closing, increases system impedance, reduces short circuit current；
4) stoppage in transit electromotor: electromotor provides the size of short circuit current to depend on its set end voltage and its transfger impedance to short dot,
Reduce short circuit current.
Short circuit current based on node impedance sensitivity the most according to claim 1 exceeds standard aid decision-making method, and its feature exists
In: in described step 4: use parallel computing platform to carry out task distribution and scheduling to reducing short circuit current measure, and then calculate
Node impedance sensitivity, and be ranked up according to the node impedance sensitivity and priority reducing short circuit current measure；
Described parallel computing platform is formed with calculating node server by managing node server, uses and is suitable for Power System Analysis meter
The parallel computing of calculation feature realizes；Management node server carry out data exchange, calculate task scheduling, result reclaim collect
And as software for calculation interface；Calculate node server and environment and the control of parallel computation are provided for all kinds of calculation procedure.
Short circuit current based on node impedance sensitivity the most according to claim 4 exceeds standard aid decision-making method, and its feature exists
Task distribution is carried out and scheduling process is as follows to reducing short circuit current measure in: described parallel computing platform:
1) parallel computing platform uses predistribution task management policy preferential, that dynamically distribution supplements, according to different parallel computations
Need to select appropriate scheduling mechanism, improve communication efficiency and the speed of overall parallel computation of system；
2) parallel computing platform uses UDP/IP physics, logical multicast and unicast technique, it is achieved reliable efficient internal data is led to
Letter mechanism, it is provided that in platform, the data of cross-node exchange and integrated service；
3) parallel computing platform uses the mechanism of Time-sharing control, and all kinds of calculating tasks carry out orderly management, simplifies calculating task
Scheduling, it is ensured that the accuracy of result of calculation transmission and integrity, improves stability and the work efficiency of system；
4) parallel computing platform provides the parallelization interface of standard, it is ensured that software for calculation can conveniently realize self and calculate task also
Rowization processes, and platform should provide the parallelization interface that task predistribution and task dynamically distribute two ways, it is ensured that the task that realizes is adjusted
Degree and parallel computation.
6. exceeding standard aid decision-making method according to the short circuit current based on node impedance sensitivity described in claim 1 or 4, it is special
Levy and be: according to the power system operating mode data being newly formed, calculate nodal impedance matrix, and calculate node impedance sensitivity, institute
State node impedance sensitivity and be characterized as the self-impedance width front with grid structure change of the variable quantity of self-impedance amplitude before and after grid structure changes
The ratio of value, its expression formula is:
Wherein, λiiExceed standard node impedance sensitivity a little for adjusting short circuit current after rack, ZiiExceed standard a little before adjusting for grid structure
Self-impedance, Z 'iiThe self-impedance exceeded standard a little after adjusting for grid structure；λiiThe biggest, represent that grid structure exceeds standard a little after adjusting
It is the most that short circuit current reduces.
7. exceeding standard aid decision-making method according to the short circuit current based on node impedance sensitivity described in claim 1 or 4, it is special
Levy and be: the node impedance that user's setting reduces short circuit current measure priority and each reduction short circuit current measure respectively is sensitive
Degree is multiplied by corresponding weight and sues for peace, and obtains the coefficient of efficiency of all reduction short circuit current measures, according to coefficient of efficiency from big to small
It is ranked up reducing short circuit current measure.
Short circuit current based on node impedance sensitivity the most according to claim 1 exceeds standard aid decision-making method, and its feature exists
In: in described step 5, reduce short circuit current measure according to node impedance sensitivity screening, and to the reduction short circuit electricity after screening
Stream measure is combined, and generates short circuit current and exceeds standard aid decision, and the short circuit current in aid decision that short circuit current is exceeded standard,
Thermally-stabilised and transient stability verifies.
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