CN102982230A - Short circuit current exceeding auxiliary decision method based on node impedance sensitivity - Google Patents
Short circuit current exceeding auxiliary decision method based on node impedance sensitivity Download PDFInfo
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Abstract
The invention provides a short circuit current exceeding auxiliary decision method based on node impedance sensitivity which includes the following steps: obtaining on-line data or off-line data, obtaining connecting relation with a physical bus, arranging power grid and breaking current and short circuit current reducing measure at a priority level; calculating open circuit voltage and short circuit current of a fault point, determining and warning a short circuit current exceeding point within the scope of power grid; as to an exceeding bus, searching measures of reducing the short circuit current; calculating the node impedance sensitivity of each measure of reducing the short circuit current and sorting measures of reducing the short circuit current; forming and verifying the short circuit current exceeding auxiliary decision method. The short circuit current exceeding auxiliary decision method based on the node impedance sensitivity is achieved based on current limiting measures capable of changing the electric power network structure. If short circuit current exceeding exists under the current operation mode, factory stand connection mode, lines and running state of a unit are automatically analyzed, and auxiliary decision and advice are provided.
Description
Technical field
The invention belongs to electric system simulation and computational analysis technical field, be specifically related to a kind of short-circuit current based on node impedance sensitivity aid decision-making method that exceeds standard.
Background technology
Short circuit refers to all situations between phase and phase abnormal or phase and ground (for the system of neutral ground) generation path.The destruction of the normal operation of electric system is caused by short trouble mostly.When being short-circuited, system is from a kind of state drastic change to another kind of state, and supervenes complicated transition effect.Produce the main cause of short circuit: (1) element is damaged, and such as the unaccelerated aging of insulating material, the equipment deficiency that design, installation and imperfect maintenance bring develops into short circuit.(2) meteorological condition worsens, and the flashover that causes such as thunderbolt discharges or lightning arrestor movement.(3) human accident is such as on-load broaching tool lock.(4) other damages cable such as ditching, and birds and beasts is connected across exposed current carrying part.
The harm of short circuit mainly contains the following aspects: (1) short trouble makes the electric current that occurs near the branch road of short dot than the large manyfold of normal value, because the dynamo-electric effect of short-circuit current, to produce very large mechanical stress between conductor, and may make conductor support destruction and accident is further enlarged.(2) short circuit continues when longer, and equipment may be overheated so that be damaged.(3) system voltage declines to a great extent during short circuit, and is very large to customer impact.(4) when the short circuit origination point was longer from not far and duration of power supply, the generator of paired running may lose synchronously, caused large areas to have a power failure, and this is the short circuit severest consequences.
Short circuit calculation is exactly under certain fault, obtains the fault current that flows through short dot and each branch road, the calculating of each busbar voltage of the whole network.The purpose of short circuit calculation: in the design and running of electric system and electrical equipment, short circuit calculation is to solve the indispensable basic calculating of series of technical, is mainly used in:
(1) selection has the electrical equipment of enough mechanical stabilities and heat stability.
(2) the various relay protections of configuration and aut.eq. and its parameter of correctly adjusting.
(3) design and select the generating plant and during the electric system main electrical scheme for the wiring diagram of different schemes relatively, determines whether to take the measure of limiting short-circuit current.
When (4) carrying out transient stability calculating, the research short circuit is on the impact of user job.
The conventional method of calculation of short-circuit current is: utilize symmetrical component method to realize ABC system and the conversion of positive and negative zero sequence system parameter; List positive and negative, zero-sequence network equation; Derive the boundary condition equation of trouble spot; With network equation and boundary condition equation simultaneous solution, obtain short-circuit current and other components.
Along with the develop rapidly of national economy and improving constantly of living standards of the people, society also constantly increases the demand of electric power, thereby has driven the development of electric system.Because the electrical network scale constantly enlarges, the sustainable growth of the continuous increase of generating set capacity, station capacity and transformer capacity and down town load density, the contact of electrical network is more and more tightr, the many regional power grids particularly short circuit current level of developed regions electrical network have approached even have surpassed the maximum rupturing capacity of isolating switch, need adopt an effective measure and limit.In actual motion, owing to reasons such as new equipment operation, voltage levvl variations, so that may surpass the rated rupturing capacity of isolating switch near the short-circuit current of the bus of the limit and circuit in planning or when design.In the past, according to the short-circuit current of maximum short circuit current calculating principle check each point, when finding to exceed standard, by experience manual change's electric network composition of method of operation personnel, generate the multiple method of operation and come limiting short-circuit current, from this multiple method of operation, filter out several feasible programs.This work that power system operating mode manually is set is consuming time, consumption power, the staff is required height and can not consider whole feasible programs.
On the other hand, the data that the current operating mode place carries out calculation of short-circuit current all are off-line datas, and these data are different from the method for operation of current electrical network, and the off-line data that uses based on mode is the operating condition that can't analyze current electrical network.Therefore, online data is derived the calculated off-line data layout, and carry out the operating condition that simulation analysis more can approach current electrical network based on online data.Method of operation place adopts very necessary based on short-circuit current and the aid decision making of online data.
Along with the interconnected fast development of large regional grid, technical merit and the complexity of electrical network are more and more higher, particularly there is electromagnetic looped network, the grid short circuit levels of current also increases day by day, the grid short circuit electric current problem that exceeds standard has become the each department electrical network and has moved in recent years one of distinct issues, especially the short-circuit current of the above electrical network of the 220kV problem that exceeds standard.The grid short circuit levels of current problem that exceeds standard not only threatens security of system, stable operation, and directly affects the economy of operation of power networks.Solving the short-circuit current problem has both direction, and the one, directly change primary equipment, the 2nd, take the measure of limiting short-circuit current.Change primary equipment and be applicable to the excessive situation of partial short-circuit electric current, when the whole system short circuit current level improves, change the very expensive of primary equipment, at this moment should consider to take the measure of limiting short-circuit current, changing electric network composition is effective method.Changing electric network composition comes the method for limiting short-circuit current to mainly contain: cut-off circuit, bus fanout operation, jump logical circuit, partition running etc., said method is to come limiting short-circuit current by artificial adjustment electric network composition mostly at present, and it is comparatively rare that program realizes automatically.These work can realize by computing machine fully, the part artificial experience is filtered out the measure of various limiting short-circuit currents in conjunction with sensitivity analysis, automatically generate the method for operation of electrical network according to the current limiting measures that generate, and carry out trend and the final definite effective current limiting measures of short-circuit current check.Also there is not at present the correlative study of short-circuit current aid decision making both at home and abroad.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of short-circuit current based on node impedance sensitivity aid decision-making method that exceeds standard, realize based on the current limiting measures that change electric network composition, if there is the short-circuit current problem that exceeds standard under the current method of operation, then the current method of operation of the automatic analysis running status of the station mode of connection, circuit and unit of going to the factory provides and draws aid decision makings such as stopping circuit, bus splitting or stoppage in transit generator suggestion.
Can find that there is the short-circuit current problem that exceeds standard in real time operation mode that the EMS state estimation provides, and carries out aid decision making for the method for operation that exists short-circuit current to exceed standard and calculates, and in time provide the aid decision making suggestion to the dispatching of power netwoks personnel.
In order to realize the foregoing invention purpose, the present invention takes following technical scheme:
A kind of short-circuit current based on node impedance sensitivity aid decision-making method that exceeds standard is provided, said method comprising the steps of:
Step 1: 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;
Step 2: calculate open-circuit voltage and the short-circuit current of trouble spot, determine that the short-circuit current in the electrical network scope exceeds standard a little, and short-circuit current exceeded standard a little carry out alarm;
Step 3: for the bus that exceeds standard, search reduces the short-circuit current measure;
Step 4: calculate the node impedance sensitivity that respectively reduces the short-circuit current measure, and sort to reducing the short-circuit current measure according to the node impedance sensitivity that reduces the short-circuit current measure and priority;
Step 5: generate the short-circuit current aid decision making that exceeds standard, and the short-circuit current aid decision making that exceeds standard is carried out verification.
Described step 2 may further comprise the steps:
Step 2-1: the open-circuit voltage and the short-circuit current that calculate the trouble spot; Detailed process is as follows:
Utilize symmetrical component method to realize ABC system and the conversion of positive and negative zero sequence system parameter; List positive and negative, zero-sequence network equation; Derive the boundary condition equation of trouble spot; With network equation and boundary condition equation simultaneous solution, obtain in the situation of the whole network bus difference fault, flow through open-circuit voltage and the short-circuit current of trouble spot;
Step 2-2: if satisfy the short-circuit current I of all buses in the setting range
SCBusBreaking current I greater than the trouble spot short-circuit current
Bc, can determine that this trouble spot is that electric current exceeds standard a little, and short-circuit current exceeded standard a little carry out alarm.
The open-circuit voltage expression formula of described trouble spot is:
Wherein:
Be the open-circuit voltage of trouble spot, E is the equivalent electromotive force of system's generator reactance after-potential; Δ V be load current cause by the pressure drop of potential source to the trouble spot; V
cBe the trouble spot open circuit voltage variations value that various compensation, circuit B/2 cause, its gross effect is capacitive usually, and it is generally greater than 0;
The short-circuit current expression formula of described trouble spot is:
Wherein, I
fBe the short-circuit current of trouble spot, V
oBe the open-circuit voltage of trouble spot, X
1System's positive sequence equivalent impedance for the trouble spot.
But motor and constant-impedance composite model, π type Type Equivalent Circuit Model, two-winding transformer model and the three-winding transformer model of synchro generator model preset proportion are supported in the calculating of described open-circuit voltage and short-circuit current.
In the described step 3, reduce the short-circuit current measure and comprise:
1) draws and stop circuit: under the not serious prerequisite that affects system reliability, draw and stop some circuit, increase the equivalent impedance of electrical network, suppress short-circuit current;
2) bus splitting: open bar coupler, make the transformer split operation, can increase system impedance, reduce short-circuit current;
3) the 500kV circuit goes out the string operation: namely when factory's station 500kV side adopts the mode of connection of one-and-half breaker, adopt the isolating switch that connects two side bus to disconnect, middle breaker closing increases system impedance, reduces short-circuit current;
4) stoppage in transit generator: generator provides the size of short-circuit current to depend on its set end voltage and its transfer impedance to short dot, reduces short-circuit current.
In the described step 4: the employing parallel computing platform carries out task distribution and scheduling to reducing the short-circuit current measure, and then the computing node impedance sensitivity, and sorts according to the node impedance sensitivity and the priority that reduce the short-circuit current measure;
Described parallel computing platform is comprised of management node server and computing node server, adopts the parallel computing that is fit to the Power System Analysis calculation features to realize; Management node carries out the scheduling of exchanges data, calculation task, the result reclaims and gathers and the software for calculation interface; Computing node provides environment and the control of parallel computation for all kinds of calculation procedure.
Described parallel computing platform carries out to reducing the short-circuit current measure that task is distributed and scheduling process is as follows:
1) parallel computing platform adopts the task management policy that predistribution is preferential, dynamic assignment is replenished, and selects appropriate scheduling mechanism according to different parallel computation needs, improves the communication efficiency of system and the speed of whole parallel computation;
2) parallel computing platform adopts UDP/IP physics, logical multicast and unicast technique, realizes reliable efficiently internal data communication mechanism, and exchanges data and the Integration Services of cross-node in the platform is provided;
3) parallel computing platform adopts the mechanism of timesharing control, and all kinds of calculation tasks are carried out orderly management, simplifies the scheduling of calculation task, guarantees accuracy and the integrality of result of calculation transmission, improves Systems balanth and work efficiency;
4) parallel computing platform provides the parallelization interface of standard, guarantee that software for calculation can realize easily that the parallelization of self calculation task processes, platform should provide the parallelization interface of task predistribution and task dynamic assignment dual mode, guarantees to realize task scheduling and parallel computation.
Power system operating mode data according to new formation, the computing node impedance matrix, and the computing node impedance sensitivity, described node impedance sensitivity characterizes as grid structure changes the variable quantity of front and back self-impedance amplitude and the ratio that grid structure changes front self-impedance amplitude, and its expression formula is:
Wherein, λ
IiFor adjusting exceed standard a little node impedance sensitivity of short-circuit current behind the rack, Z
IiBe the self-impedance that exceeds standard before the grid structure adjustment a little, Z '
IiBe a little the self-impedance of exceeding standard after the grid structure adjustment; λ
IiLarger, a little the short-circuit current minimizing of exceeding standard after the expression grid structure adjustment more.
Respectively corresponding weight and summation are multiply by in user the reduction short-circuit current measure priority of setting and the node impedance sensitivity that each reduces the short-circuit current measure, obtain the coefficient of efficiency that all reduce the short-circuit current measure, sort to reducing the short-circuit current measure from big to small according to coefficient of efficiency.
In the described step 5, reduce the short-circuit current measure according to node impedance sensitivity screening, and the reduction short-circuit current measure after the screening made up, generate the short-circuit current aid decision making that exceeds standard, and exceed standard short-circuit current in the aid decision making, thermally-stabilised and transient stability of short-circuit current carried out verification.
Compared with prior art, beneficial effect of the present invention is:
1. proposed a kind of for the unified aid decision-making method that adopts node impedance sensitivity to come quick calculating short circuit current to exceed standard of multiple current limiting measures, that bus under the real time operation mode that the EMS state estimation is provided carries out Analysis of Short-Circuit Current, if have exceed standard problem then start the short-circuit current aid decision making and calculate of short-circuit current, guarantee the security and stability of electrical network real time execution.When this function guarantees that method of operation constantly changes, finds exceed standard problem and in time provide aid decision making suggestion to the dispatching of power netwoks personnel of potential short-circuit current.This requires the online computing velocity of short-circuit current aid decision making to want fast, and the decision information that provides is simple and feasible, can not bring other safety and stability problem;
2. under the actual electric network data, carry out calculation of short-circuit current, the research of node impedance sensitivity analysis and aid decision making and trial, find out the exceed standard method of aid decision making of a kind of short-circuit current, the method can be carried out the short-circuit current simulation calculation to real time operation mode, the problem of exceeding standard that may occur is carried out alarm, carry out the electric network composition adjustment according to node impedance sensitivity and come effectively that limiting short-circuit current exceeds standard, and provide aid decision making, the potential safety hazard of in time elimination system existence, instruct the adjustment of the method for operation, have great significance for the safe and stable operation of electrical network;
3. because this method is carried out the electric network composition adjustment automatically, do not need the participation of a large amount of manpowers, do not need very professional personnel to carry out the short-circuit current adjustment yet, computing velocity also obviously promotes, effectively solved the conventional limited short-circuit current mode of carrying out adjust with computation process in need a large amount of manpowers, dependence experience, computing velocity is slow and inefficient problem, has widely popularizing application prospect.
Description of drawings
The short-circuit current that Fig. 1 the is based on node impedance sensitivity aid decision-making method process flow diagram that exceeds standard.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Such as Fig. 1, a kind of short-circuit current based on node impedance sensitivity aid decision-making method that exceeds standard is provided, said method comprising the steps of:
Step 1: 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;
Step 2: calculate open-circuit voltage and the short-circuit current of trouble spot, determine that the short-circuit current in the electrical network scope exceeds standard a little, and short-circuit current exceeded standard a little carry out alarm;
Step 3: for the bus that exceeds standard, search reduces the short-circuit current measure;
Step 4: calculate the node impedance sensitivity that respectively reduces the short-circuit current measure, and sort to reducing the short-circuit current measure according to the node impedance sensitivity that reduces the short-circuit current measure and priority;
Step 5: generate the short-circuit current aid decision making that exceeds standard, and the short-circuit current aid decision making that exceeds standard is carried out verification.
Described step 2 may further comprise the steps:
Step 2-1: the open-circuit voltage and the short-circuit current that calculate the trouble spot; Detailed process is as follows:
Utilize symmetrical component method to realize ABC system and the conversion of positive and negative zero sequence system parameter; List positive and negative, zero-sequence network equation; Derive the boundary condition equation of trouble spot; With network equation and boundary condition equation simultaneous solution, obtain in the situation of the whole network bus difference fault, flow through open-circuit voltage and the short-circuit current of trouble spot;
Step 2-2: if satisfy the short-circuit current I of all buses in the setting range
SCBusBreaking current I greater than the trouble spot short-circuit current
Bc, can determine that this trouble spot is that electric current exceeds standard a little, and short-circuit current exceeded standard a little carry out alarm.
The open-circuit voltage expression formula of described trouble spot is:
Wherein:
Be the open-circuit voltage of trouble spot, E is the equivalent electromotive force of system's generator reactance after-potential; Δ V be load current cause by the pressure drop of potential source to the trouble spot; V
cBe the trouble spot open circuit voltage variations value that various compensation, circuit B/2 cause, its gross effect is capacitive usually, and it is generally greater than 0;
The short-circuit current expression formula of described trouble spot is:
Wherein, I
fBe the short-circuit current of trouble spot, V
oBe the open-circuit voltage of trouble spot, X
1System's positive sequence equivalent impedance for the trouble spot.
But motor and constant-impedance composite model, π type Type Equivalent Circuit Model, two-winding transformer model and the three-winding transformer model of synchro generator model preset proportion are supported in the calculating of described open-circuit voltage and short-circuit current.
In the described step 3, reduce the short-circuit current measure and comprise:
1) draws and stop circuit: under the not serious prerequisite that affects system reliability, draw and stop some circuit, increase the equivalent impedance of electrical network, suppress short-circuit current;
2) bus splitting: open bar coupler, make the transformer split operation, can increase system impedance, reduce short-circuit current;
3) the 500kV circuit goes out the string operation: namely when factory's station 500kV side adopts the mode of connection of one-and-half breaker, adopt the isolating switch that connects two side bus to disconnect, middle breaker closing increases system impedance, reduces short-circuit current;
4) stoppage in transit generator: generator provides the size of short-circuit current to depend on its set end voltage and its transfer impedance to short dot, reduces short-circuit current.
In the described step 4: the employing parallel computing platform carries out task distribution and scheduling to reducing the short-circuit current measure, and then the computing node impedance sensitivity, and sorts according to the node impedance sensitivity and the priority that reduce the short-circuit current measure.
Described parallel computing platform is comprised of management node server and computing node server, adopts the parallel computing that is fit to the Power System Analysis calculation features to realize; Management node carries out the scheduling of exchanges data, calculation task, the result reclaims and gathers and the software for calculation interface; Computing node provides environment and the control of parallel computation for all kinds of calculation procedure.
Described parallel computing platform carries out to reducing the short-circuit current measure that task is distributed and scheduling process is as follows:
1) parallel computing platform adopts the task management policy that predistribution is preferential, dynamic assignment is replenished, and selects appropriate scheduling mechanism according to different parallel computation needs, improves the communication efficiency of system and the speed of whole parallel computation;
2) parallel computing platform adopts UDP/IP physics, logical multicast and unicast technique, realizes reliable efficiently internal data communication mechanism, and exchanges data and the Integration Services of cross-node in the platform is provided;
3) parallel computing platform adopts the mechanism of timesharing control, and all kinds of calculation tasks are carried out orderly management, simplifies the scheduling of calculation task, guarantees accuracy and the integrality of result of calculation transmission, improves Systems balanth and work efficiency;
4) parallel computing platform provides the parallelization interface of standard, guarantee that software for calculation can realize easily that the parallelization of self calculation task processes, platform should provide the parallelization interface of task predistribution and task dynamic assignment dual mode, guarantees to realize task scheduling and parallel computation.
Reduce the short-circuit current measure and be nothing but grid structure by adjusting electrical network with the electrical link of suitable minimizing network, namely reduce each power supply to the impedance of short dot, this is one of effective method of reduction short circuit current level.The self-impedance of nodal impedance matrix then be power supply to the impedance of short dot, the impedance variation that the adjustment electric network composition causes all can be reflected to nodal impedance matrix.From the impedance matrix level analysis, draw in the electrical network and stop circuit and stoppage in transit generator, be equivalent to reduce chord on former network impedance matrix basis, can increase the self-impedance of all websites, thereby make the short-circuit current of all websites that in various degree decline be arranged; On the contrary, connect circuit in the electrical network, being equivalent to increases chord on former network impedance matrix basis, can reduce the self-impedance of all websites, thereby make the short-circuit current of all websites that in various degree rising be arranged, along with the increase of system loading, also can constantly drop into new equipment in the system, the input of these equipment can be continuous the self-impedance of all websites in the minimizing system, make the short-circuit current of all websites that in various degree rising be arranged, some website then the phenomenon that short-circuit current exceeds standard can occur.
Short-circuit current is the ratio of the self-impedance of the node voltage of instantaneous short circuit point before the short circuit and short dot, such as 1) shown in the short-circuit current formula in calculation of short-circuit current and the alarm that exceeds standard, no matter be that to change or increase primary equipment or change electric network composition all be to effectively reduce short circuit current level by increasing short-circuit impedance.For ten thousand node level large scale electric networks, local electric network composition changes in the little situation, V
oSubstantially constant, so the grid structure self-impedance of the website situation of change of short-circuit current that changed complete reaction that exceeds standard after changing.
Power system operating mode data according to new formation, the computing node impedance matrix, and the computing node impedance sensitivity, described node impedance sensitivity characterizes as grid structure changes the variable quantity of front and back self-impedance amplitude and the ratio that grid structure changes front self-impedance amplitude, and its expression formula is:
Wherein, λ
IiFor adjusting exceed standard a little node impedance sensitivity of short-circuit current behind the rack, Z
IiBe the self-impedance that exceeds standard before the grid structure adjustment a little, Z '
IiBe a little the self-impedance of exceeding standard after the grid structure adjustment; λ
IiLarger, a little the short-circuit current minimizing of exceeding standard after the expression grid structure adjustment more.
Respectively corresponding weight and summation are multiply by in user the reduction short-circuit current measure priority of setting and the node impedance sensitivity that each reduces the short-circuit current measure, obtain the coefficient of efficiency that all reduce the short-circuit current measure, sort to reducing the short-circuit current measure from big to small according to coefficient of efficiency.
In the described step 5, reduce the short-circuit current measure according to node impedance sensitivity screening, and the reduction short-circuit current measure after the screening made up, generate the short-circuit current aid decision making that exceeds standard, and exceed standard short-circuit current in the aid decision making, thermally-stabilised and transient stability of short-circuit current carried out verification.
Short-circuit current verification: guarantee effectively limiting short-circuit current of the strategy chosen, and provide the busbar short-circuit Current calculation value after current limiting measures are implemented, namely apply I after the current limiting measures
SCBus＜I
Bc
Thermally-stabilised verification: there is not new thermally-stabilised problem in the method for operation of guaranteeing to apply after the current limiting measures;
The transient stability verification: there is not new transient stability problem in the method for operation of guaranteeing to apply after the current limiting measures;
If satisfy the requirement of above-mentioned three aspects:, this strategy is for reducing the optimal strategy of short-circuit current; If do not satisfy, then choose the less reduction short-circuit current measure of sensitivity, carry out again above-mentioned verification, until till meeting the demands.
Generate the short-circuit current aid decision making that exceeds standard following two kinds of measures arranged:
1) considers the minimizing calculated amount, and make the result of adjustment more reasonable, the measures for limiting short-circuit current of preferential user's appointment, the user can specify the adjustment strategy after the out-of-limit situation of short-circuit current appears in each website, according to the priority of adjusting strategy, provide every kind or several short-circuit current situation of adjusting strategy.
2) if the user can not provide concrete adjustment strategy, then adopt measures for limiting short-circuit current (only limiting to adjust network structure) commonly used, for example: the stoppage in transit generator, draw stop circuit, bus splitting (bus split at the factory station that exceeds standard), 500kV factory station track road goes out the string operation, and the priority of definite restriction.
The present invention has following features:
(1) calculation of short-circuit current: carry out fast short-circuit current scanning based on online data, provide the short circuit current level of all buses.
(2) the short-circuit current auto-alarming that exceeds standard: according to the short-circuit current limit value of each bus, the bus that the automatic screening short-circuit current exceeds standard, and provide alarm.
(3) impedance sensitivity analysis: analyze near exceed standard the electric network composition bus of short-circuit current, calculate the impedance sensitivity that various electric network compositions change.
(4) adopt the parallel computing that is fit to the Power System Analysis calculation features to realize the quick calculating of short-circuit current aid decision making, comprise the functions such as exchanges data, calculation task scheduling, result's recovery gather;
(5) short-circuit current aid decision making: according to the impedance sensitivity analysis result, carrying out the adjustment of short-circuit current current limliting calculates, generate various reduction short-circuit current measure (comprising the combination measure), and carry out trend, hot steady and transient stability verifying work, finally provide feasible reduction short-circuit current measure.
Embodiment
This method is applied in certain regional power grid safety on line assessment and early warning system.This electrical network comprises 6 provincial power networks.The online data that simulation calculation is used is the real time operation mode data that generate after providing Data of State Estimation to integrate through online data by EMS.These data are carried out calculation of short-circuit current, and provide the short-circuit current warning that exceeds standard; Then short-circuit current is exceeded standard and a little carry out the node impedance sensitivity analysis, generate the reduction short-circuit current measure with operability according to the sensitivity analysis result; At last verification is carried out in the reduction short-circuit current measure that generates, and provided decision-making assistant information.
Result of calculation is analyzed, and the short-circuit current of the generation decision-making assistant information that exceeds standard can effectively reduce short-circuit current, and can satisfy the operation requirements of management and running.
This method is carried out research and the trial of calculation of short-circuit current, impedance sensitivity analysis and aid decision making under the actual electric network data, find out a kind of short-circuit current aid decision-making method that exceeds standard, the method can be carried out the short-circuit current simulation calculation to real time operation mode, the problem of exceeding standard that may occur is carried out alarm, carrying out the electric network composition adjustment according to impedance sensitivity effectively reduces short-circuit current and exceeds standard, and provide aid decision making, the potential safety hazard of in time elimination system existence instructs the adjustment of the method for operation.Because this method is carried out the electric network composition adjustment automatically, do not need the participation of a large amount of manpowers, do not need very professional personnel to carry out the short-circuit current adjustment yet, computing velocity also obviously promotes, effectively solved the conventional limited short-circuit current mode of carrying out adjust with computation process in need a large amount of manpowers, dependence experience, computing velocity is slow and inefficient problem, has widely popularizing application prospect.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. the short-circuit current based on node impedance sensitivity aid decision-making method that exceeds standard is characterized in that: said method comprising the steps of:
Step 1: 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;
Step 2: calculate open-circuit voltage and the short-circuit current of trouble spot, determine that the short-circuit current in the electrical network scope exceeds standard a little, and short-circuit current exceeded standard a little carry out alarm;
Step 3: for the bus that exceeds standard, search reduces the short-circuit current measure;
Step 4: calculate the node impedance sensitivity that respectively reduces the short-circuit current measure, and sort to reducing the short-circuit current measure according to the node impedance sensitivity that reduces the short-circuit current measure and priority;
Step 5: generate the short-circuit current aid decision making that exceeds standard, and the short-circuit current aid decision making that exceeds standard is carried out verification.
2. the short-circuit current based on the node impedance sensitivity according to claim 1 aid decision-making method that exceeds standard, it is characterized in that: described step 2 may further comprise the steps:
Step 2-1: the open-circuit voltage and the short-circuit current that calculate the trouble spot; Detailed process is as follows:
Utilize symmetrical component method to realize ABC system and the conversion of positive and negative zero sequence system parameter; List positive and negative, zero-sequence network equation; Derive the boundary condition equation of trouble spot; With network equation and boundary condition equation simultaneous solution, obtain in the situation of the whole network bus difference fault, flow through open-circuit voltage and the short-circuit current of trouble spot;
Step 2-2: if satisfy the short-circuit current I of all buses in the setting range
SCBusBreaking current I greater than the trouble spot short-circuit current
Bc, can determine that this trouble spot is that electric current exceeds standard a little, and short-circuit current exceeded standard a little carry out alarm.
3. the short-circuit current based on the node impedance sensitivity according to claim 2 aid decision-making method that exceeds standard, it is characterized in that: the open-circuit voltage expression formula of described trouble spot is:
Wherein:
Be the open-circuit voltage of trouble spot, E is the equivalent electromotive force of system's generator reactance after-potential; Δ V be load current cause by the pressure drop of potential source to the trouble spot; V
cBe the trouble spot open circuit voltage variations value that various compensation, circuit B/2 cause, its gross effect is capacitive usually, and it is generally greater than 0;
The short-circuit current expression formula of described trouble spot is:
Wherein, I
fBe the short-circuit current of trouble spot, V
oBe the open-circuit voltage of trouble spot, X
1System's positive sequence equivalent impedance for the trouble spot.
4. the short-circuit current based on the node impedance sensitivity according to claim 3 aid decision-making method that exceeds standard is characterized in that: but motor and constant-impedance composite model, π type Type Equivalent Circuit Model, two-winding transformer model and the three-winding transformer model of synchro generator model preset proportion are supported in the calculating of described open-circuit voltage and short-circuit current.
5. the short-circuit current based on the node impedance sensitivity according to claim 1 aid decision-making method that exceeds standard is characterized in that: in the described step 3, reduce the short-circuit current measure and comprise:
1) draws and stop circuit: under the not serious prerequisite that affects system reliability, draw and stop some circuit, increase the equivalent impedance of electrical network, suppress short-circuit current;
2) bus splitting: open bar coupler, make the transformer split operation, can increase system impedance, reduce short-circuit current;
3) the 500kV circuit goes out the string operation: namely when factory's station 500kV side adopts the mode of connection of one-and-half breaker, adopt the isolating switch that connects two side bus to disconnect, middle breaker closing increases system impedance, reduces short-circuit current;
4) stoppage in transit generator: generator provides the size of short-circuit current to depend on its set end voltage and its transfer impedance to short dot, reduces short-circuit current.
6. the short-circuit current based on the node impedance sensitivity according to claim 1 aid decision-making method that exceeds standard, it is characterized in that: in the described step 4: adopt parallel computing platform to carry out task distribution and scheduling to reducing the short-circuit current measure, and then the computing node impedance sensitivity, and sort according to the node impedance sensitivity and the priority that reduce the short-circuit current measure;
Described parallel computing platform is comprised of management node server and computing node server, adopts the parallel computing that is fit to the Power System Analysis calculation features to realize; Management node carries out the scheduling of exchanges data, calculation task, the result reclaims and gathers and the software for calculation interface; Computing node provides environment and the control of parallel computation for all kinds of calculation procedure.
7. the short-circuit current based on the node impedance sensitivity according to claim 6 aid decision-making method that exceeds standard is characterized in that: described parallel computing platform carries out to reducing the short-circuit current measure that task is distributed and scheduling process is as follows:
1) parallel computing platform adopts the task management policy that predistribution is preferential, dynamic assignment is replenished, and selects appropriate scheduling mechanism according to different parallel computation needs, improves the communication efficiency of system and the speed of whole parallel computation;
2) parallel computing platform adopts UDP/IP physics, logical multicast and unicast technique, realizes reliable efficiently internal data communication mechanism, and exchanges data and the Integration Services of cross-node in the platform is provided;
3) parallel computing platform adopts the mechanism of timesharing control, and all kinds of calculation tasks are carried out orderly management, simplifies the scheduling of calculation task, guarantees accuracy and the integrality of result of calculation transmission, improves Systems balanth and work efficiency;
4) parallel computing platform provides the parallelization interface of standard, guarantee that software for calculation can realize easily that the parallelization of self calculation task processes, platform should provide the parallelization interface of task predistribution and task dynamic assignment dual mode, guarantees to realize task scheduling and parallel computation.
8. according to claim 1 or 6 described short-circuit currents based on the node impedance sensitivity aid decision-making method that exceeds standard, it is characterized in that: according to the power system operating mode data of new formation, the computing node impedance matrix, and computing node impedance sensitivity, described node impedance sensitivity characterizes as grid structure changes the variable quantity of front and back self-impedance amplitude and the ratio that grid structure changes front self-impedance amplitude, and its expression formula is:
Wherein, λ
IiFor adjusting exceed standard a little node impedance sensitivity of short-circuit current behind the rack, Z
IiBe the self-impedance that exceeds standard before the grid structure adjustment a little, Z '
IiBe a little the self-impedance of exceeding standard after the grid structure adjustment; λ
IiLarger, a little the short-circuit current minimizing of exceeding standard after the expression grid structure adjustment more.
9. according to claim 1 or 6 described short-circuit currents based on the node impedance sensitivity aid decision-making method that exceeds standard, it is characterized in that: respectively corresponding weight and summation are multiply by in user the reduction short-circuit current measure priority of setting and the node impedance sensitivity that each reduces the short-circuit current measure, obtain the coefficient of efficiency that all reduce the short-circuit current measure, sort to reducing the short-circuit current measure from big to small according to coefficient of efficiency.
10. the short-circuit current based on the node impedance sensitivity according to claim 1 aid decision-making method that exceeds standard, it is characterized in that: in the described step 5, reduce the short-circuit current measure according to node impedance sensitivity screening, and to the screening after the measure of reduction short-circuit current make up, generate the short-circuit current aid decision making that exceeds standard, and exceed standard short-circuit current in the aid decision making, thermally-stabilised and transient stability of short-circuit current carried out verification.
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