CN106208049A - The practical approach that a kind of power distribution network simple state is estimated - Google Patents
The practical approach that a kind of power distribution network simple state is estimated Download PDFInfo
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- CN106208049A CN106208049A CN201610670874.7A CN201610670874A CN106208049A CN 106208049 A CN106208049 A CN 106208049A CN 201610670874 A CN201610670874 A CN 201610670874A CN 106208049 A CN106208049 A CN 106208049A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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Abstract
A kind of method that the present invention relates to electric field state estimation, particularly relates to the practical approach that a kind of power distribution network simple state is estimated, comprises the steps: (1) Historic Section Data Matching；(2) power distribution network topological tree generates；(3) switch remote signalling identification；(4) remote measurement polishing；(5) cyclization analysis；(6) examination statistics；(7) daily load prediction.The application provides the practical approach that a kind of power distribution network simple state is estimated, thus the remote signalling value of identification switch/disconnecting link, polishing switch remote measurement value, estimate the most believable system running state.
Description
Technical field
A kind of method that the present invention relates to electric field state estimation, particularly relates to a kind of power distribution network simple state and estimates
The practical approach of meter.
Background technology
State estimation also referred to as " filtering ", be the redundancy of utilization examining system to get rid of irrational wrong data,
Improve the precision of data, the running status of estimating system, provide credible, consistent flow data.It is to join that state of electric distribution network is estimated
The basis of electrical network analysis, can be that the senior application such as idle work optimization, voltage & var control provides credible, consistent basic data.
While improving data reliability, improve the practical level of each senior application.
At present, power distribution network measure configuration is few, intelligent and automatization level is relatively low.Using with adopt the metrical information of distribution transforming as
Pseudo-measure, still can not obtain higher redundancy, but it is estimated that system close on unobservable in the case of system the most credible
Running status.
Power distribution network only has feeder line service entrance switch and the block switch of minority, on-load switch to have measure configuration at present, and deposits
In the inaccurate problem of measurement that the problems such as factor data collection and communication port cause, distribution main website with the extraction system time not
Synchronicity, causes the unmatched problem of inter-system data section.
Prior art simplifies electric connecting relation, it is believed that a feeder line generates a distribution sub-island, according to circuit
Kirchhoff's law takes remote measurement the pretreatment of data, sharing of load and load assemble the remote measurement polishing carrying out switching, use
Sectional carries out the method for local state estimation.And in reality, when between feeder line, interconnection switch closes position, it is impossible to determine load/distribution transforming
By which section feeder line powered, it is impossible to simply a feeder line is generated a distribution sub-island, simplify electric connecting relation unreasonable；Real
The not all distribution transforming in border all has measure configuration and metric data, it is also difficult to ensure with adopting distribution transforming and distribution main website mates completely,
It is irrational that prior art processes the mode of load/distribution transforming；Prior art being thought, the remote signalling value of switch/disconnecting link is correct nothing
By mistake, only switch remote measurement value being carried out pretreatment, processing mode is not inconsistent with practical situation.
Summary of the invention
The purpose of the present invention, is to combine power distribution network to run present situation, it is provided that the practicality side that a kind of power distribution network simple state is estimated
Method, thus the remote signalling value of identification switch/disconnecting link, polishing switch remote measurement value, estimate the most believable system running state.
Technical scheme is as follows:
The practical approach that a kind of power distribution network simple state is estimated, comprises the steps:
(1) Historic Section Data Matching
Read with extraction system 96 power curve data every day and corresponding section moment, choose in distribution main website section
The section in time closest to this section moment and the section in first 5 minutes of this section moment and latter 5 minutes, choose by the merit adopting distribution transforming
Rate curve is gained merit data, by platform area code set up main website distribution transforming with adopting the matching relationship of distribution transforming, by calculating between two systems 3
The distribution transforming active power error matched in individual section, splices with extraction system with the main website section that error is minimum, with
Adopt the section moment as section complete after splicing in the section moment；With with adopting the power curve data assignment main website side of distribution transforming mutually
The distribution low-voltage winding power joined measures；
(2) power distribution network topological tree generates
First, Article 1 line bus1 and Article 2 line bus2 represents that interconnection switch between two feeder lines closes the situation of position, when the
Article one, line bus1, Article 2 line bus2 side load summation be all higher than or the most respective service entrance switch power measurement (such as:
Time 100kW), illustrate to measure and forbidden, the most do not generate topological tree；If Article 1 line bus1 side total load is less than Article 1 line bus1
Side service entrance switch measures, and Article 2 line bus2 side total load measures more than Article 2 line bus2 side service entrance switch, and contact is described
Switch power is flowed to Article 2 line bus2 by Article 1 line bus1, by the service entrance switch of Article 2 line bus2 side, according to electricity
The regular tap of gas annexation traversal point position, till the loading assembled is more than service entrance switch, dividing this switch upstream
The switch of looped network, as untiing the switch of looped network, is untied with this in Article 1 line bus1 and Article 2 line bus2 side by bit switch respectively
Topological tree is generated for cut-off condition；Vice versa；
Through above-mentioned steps, all feeder lines being generated topological tree, the process generating topological tree is: disregard switch/disconnecting link
State, carries out depth-first search with the interconnection switch of point position or the switch specified for border, generate comprise bus, switch/
The topological tree of disconnecting link, load/distribution transforming equipment, searchable equipment；During topology, with root node i.e. substation exit bus to
Line end recursive search, and mark the flow direction of power, i.e. according to first searching nd or znd of equipment to determine this equipment
Power flow direction；
(3) switch remote signalling identification
Upstream and downstream topological relation, the state of upstream equipment and measuring value according to equipment, upstream device be the most charged, with or without
The information such as other plant-grid connection state based on following principle judgement switch:
Divide position state of switch/disconnecting link downstream to connect the load/distribution transforming measuring absolute value more than 0, and supply without other power supply
Electricity, then this switch/disconnecting link of accurate recognition is for closing position and being modified to close position；
State point position and measure absolute value switch/disconnecting link downstream more than 0 and do not have load/distribution transforming, switch/disconnecting link state and
Measuring the situation of contradiction, this switch/disconnecting link remote signalling is suspicious；
Switch/disconnecting link state closes position, downstream load/distribution transforming and switch measure be 0 and upstream without the switch/cutter of point position
Lock, then this switch/disconnecting link remote signalling is suspicious；
For the switch of wobble variation, owing to its time of day cannot be determined, use the above principle can be with accurate recognition
Close position, or be recognized as suspicious point of position；
(4) remote measurement polishing
After remote signalling identification, distribution sub-island generate, add up the injecting power of each junction point in each distribution sub-island, through with
Lower process determines electric current and the power of branch road:
F) assume that the whole network voltage is root node voltage U, it is known that each junction point power, branch resistance G and reactance B parameter, depend on
Branch power can be calculated according to following equation；
G) against power flow direction, calculate forward with branch power according to node injecting power, calculate each branch power and electricity
Stream；
H) along power flow direction, according to each branch power and first node voltage, branch voltage fall is calculated；
I) two processes of b, c are repeated, until the voltage difference of all nodes less than a limit value or reaches the meter specified
Till calculating number of times；
J) close line segment serial number sec, zsec that the switch both sides of position connect, find with not line segment sequence number for the side of-1
Line segment, with this line segment electric current, meritorious, the electric current of idle polishing switch, power measurement；If sec Yu isec is-1, statistic switch
The line segment that both sides connect, if the node number zbs of the line segment other end is more than the bs of switch, the most respectively by this line current, meritorious, nothing
Merit is sued for peace, with the electric current of result polishing switch, power measurement after summation；
(5) cyclization analysis
After generating topological tree remote signalling identification, carry out sectional, bus analysis, electrical island analysis generation distribution sub-island；
(6) examination statistics
After remote signalling identification correction, with a point position state, the switch of power measurement is had to generate section for border, in section
The switch of trip is that power flows into switch, and remaining flows out switch for power, and the difference calculating power carries out regional imbalance statistics, no
Aequum comprises meritorious with idle；Setting voltage bound, busbar voltage measures and carries out busbar voltage compared with voltage bound
Out-of-limit statistics, for single phase model, voltage takes AB phases line voltage, takes current measurement maximum and the screening of switch in A, B, C three-phase
Disconnected capacity carries out switching heavy duty/out-of-limit analysis；Being less than 100% more than setting value is heavy duty, is out-of-limit more than 100%；
The reason of topology failure feeder line is divided into: feeder line can not find bus, feeder line can not find cyclization between service entrance switch and feeder line；
During generating distribution sub-island, search another outlet bus then cyclization with side substation exit bus, add up cyclization feeder line；
To each distribution sub-island, its island internal loading summation and service entrance switch power measurement carry out initial network loss statistics；Through examination statistics
Function, the result of display state directly perceived estimation and effect；
(7) daily load prediction
The partial data section that Historic Section Data Matching obtains, has 96 complete data section every day, by every day 96
Individual data section obtains 288 data section every day according to linear interpolation method, according to the similar day date the most to be predicted forward 10
The load data on it similar date and the Forecasting Methodology of linear extrapolation, for with adopting the distribution transforming that distribution transforming matches, carry out bearing day
Lotus is predicted；Predict the load data of 24 hours days to be predicted, carry out real-time status estimation in conjunction with distribution main website real time data.
Further, in described step (1), for a distribution transforming unmatched, if winding power measurement in high-pressure side is meritorious,
Idle occur the most in pairs, calculates idle with the power factor of the service entrance switch of feeder line belonging to this distribution transforming, make distribution transforming high-pressure side gain merit,
Idle measurement occurs in pairs；If main website high-pressure side load is without measuring, then the power measurement of the on-load switch connected with this distribution transforming is composed
Value high-pressure side winding power measures, and to ensure equally to gain merit, idle paired appearance.
Further, described step (3) detailed process is:
E) traversal measures the load/distribution transforming more than 0, the hierarchical relationship in topological tree find the on-load switch of upstream, if
This on-load switch divides position, then this on off state mistake is described, and is modified to close position；
F) regular tap of position is divided to the direction of circuit head end traversal with line end, with this switch to line end (root
Determine according to power flow direction) search for the load/distribution transforming measured more than 0 or be modified to close the switch of position, if searching, then this point of position
Regular tap status error, and be modified to close position；If not searching the magnitude of current of the regular tap of load/distribution transforming and this point of position
Survey more than 0, then illustrate that this point of bit switch state is suspicious；
G) traversal measurement is the load/distribution transforming of 0, according to the conjunction bit switch of the hierarchical relationship search upstream in topological tree, if
The conjunction bit switch current measurement searched is 0, and this conjunction bit switch does not exist the switch of point position to root node, then illustrate that this closes position
On off state is suspicious；
H) switch is after identification terminates, it is judged that the switch of the switch of accurate recognition/suspicious identification whether wobble variation, if so,
Then save as and accurately close position or suspicious point of position.
Further, in described step (5), for closed loop design, the power distribution network of open loop operation, due to opening of instantaneity
Close combination operation, remote signalling data problem causes cyclization between feeder line；Show as when electrical island is analyzed from a substation exit bus
Search another substation exit bus, push back before employing and cannot process the situation of cyclization between this feeder line for Load flow calculation,
When generating distribution sub-island, the feeder line of cyclization between feeder line is filtered, be not involved in Load flow calculation and measure polishing；Wherein, dual power supply
Power actual can only be by power supplying from one direction, the situation determined by prepared auto restart equipment is not belonging to cyclization, need to negative by dual power supply
Lotus splits into two independent loads, is powered by two ends power supply respectively, and cyclization filters out the situation of dual power supply when analyzing.
The beneficial effects of the present invention is:
(1) according to the upstream and downstream topological relation of switch/disconnecting link equipment, the measurement information of upstream and downstream equipment, load/distribution transforming it is
No charged, carry out switching/disconnecting link remote signalling identification with or without information such as other plant-grid connection, it is possible to be accurately judged to opening of remote signalling mistake
Close, the switch that remote signalling is suspicious, the accurate wobble variation closing position and suspicious point of position switch.There is significant identification effect.
(2) use the electric current of approximation Load flow calculation polishing switch and the method for power measurement, do not have what calculating did not restrained
Situation, compares the method for estimating state such as orthogonal transformation, least-squares estimation, singular value decomposition, have faster calculate speed and
Precision.
(3) service entrance switch is only had to have measure configuration with part regular tap, gain merit not become with reactive power for power distribution network
To the present situation occurred, measure configuration is low, the present invention also can estimate the most believable fortune of system under less measure configuration present situation
Row state.
Accompanying drawing explanation
Fig. 1 show interconnection switch between two feeder lines of bus1 and bus2 and closes the situation of position.
Fig. 2 show the example of switch remote signalling identification step, and wherein k2, k3 are the switch that state is suspicious.
Fig. 3 show in remote measurement polishing step, with electric current, the power sum polishing switch phase of line segment sec1, sec2, sec3
The example that should measure.
Detailed description of the invention
Technical term in the present invention is described below:
Topological tree generates: according to the connection node of electrical equipment, the equipment that search is associated, to characterize father and son's brotherhood
The tree equipment that searches of storage organization storage.The topological tree generated characterizes annexation and the upstream and downstream level pass of equipment room
System.The present invention generates a kind of tree-like storage structure comprising the equipment such as bus, switch, load/distribution transforming, it is simple to equipment of searching connects
Relation and the topological tree of hierarchical relationship.
Daily load prediction: for distribution transforming historical load data, by following 24 hours of similar day linear extrapolation method prediction
The load data of interior every five minutes, carries out real-time data analysis using the load value of prediction as Real-time Load metric data.
Remote signalling identification: switch/disconnecting link remote signalling value is divided into: close position and point position (i.e. the state of switch/disconnecting link), by switching/
Disconnecting link upstream and downstream equipment is the most charged, equipment amount measured value, switch/disconnecting link remote measurement value judges that the state of switch is the most correct.Energy
Enough it is accurately judged to incorrect switch, corrects its remote signalling value (i.e. state)；It is judged as the switch that remote signalling value (state) is suspicious, right
Its mark.
Remote measurement polishing: estimate the electric current of each branch road, meritorious, idle with power distribution network forward-backward sweep method, statistic switch with open
Close the relation of relative branch, the electric current of relative branch, the switch correspondence giving measurement disappearance meritorious, idle are measured.
Historic Section Data Matching: electrical power distribution automatization system main website profile data and electricity consumption acquisition system distribution transforming profile data
Coupling, the distribution transforming of distribution main website mated by platform area code with adopting distribution transforming, by by the power assignment main website side phase adopting distribution transforming
The low-pressure side winding power of coupling distribution transforming.
Depth-first search: depth-first search belongs to the one of nomography, english abbreviation is DFS i.e. Depth First
Search. its process be in simple terms the individual path that each is possible is deep into can not more deeply till, and each joint
Point can only access once.
Below in conjunction with the accompanying drawings, technical scheme is made detailed elaboration.
The present invention comprises the following specific steps that:
1, Historic Section Data Matching
For carrying out Load flow calculation, all loads of power distribution network/distribution transforming point is needed to have load data, yet with field measurement
Configuration is not enough, or measurement terminal is in state to be repaired, it is difficult to ensure the load data of all load point.Access marketing system
The continuous data of system, mates the distribution transforming of distribution main website with adopting distribution transforming according to platform area code, with by the power curve adopting distribution transforming
Load/switching data that data assignment main website side matches.
Read with extraction system 96 power curve data every day and corresponding section moment, choose in distribution main website section
The section in time closest to this section moment and the section in first 5 minutes of this section moment and latter 5 minutes, choose by the merit adopting distribution transforming
Rate curve is gained merit data, by platform area code set up main website distribution transforming with adopting the matching relationship of distribution transforming, by calculating between two systems 3
The distribution transforming active power error matched in individual section, splices with extraction system with the main website section that error is minimum.With with
Adopt the section moment as section complete after splicing in the section moment.
Measure with the distribution low-voltage winding power matched with the power curve data assignment main website side adopting distribution transforming；For
The distribution transforming unmatched, occurs the most in pairs if winding power measurement in high-pressure side is meritorious, idle, opens with the inlet wire of feeder line belonging to this distribution transforming
The power factor closed calculates idle, makes that distribution transforming high-pressure side is meritorious, idle measurement occurs in pairs；If main website high-pressure side load is immeasurable
Survey, then the power measurement assignment high-pressure side winding power of the on-load switch connected with this distribution transforming measures, and to ensure equally to gain merit, nothing
Merit occurs in pairs.
2, power distribution network topological tree generates
According to the electric connecting relation of equipment, do not consider the folding condition of switch/disconnecting link, use the plan of depth-first search
Slightly travel through all of equipment, generate the topological tree characterizing upstream and downstream equipment connecting relation.Due to load transfer, network reconfiguration, inspection
The operation such as repair, cause the situation that feeder line lower part load is powered by other feeder line by interconnection switch.Can not be simply by one
Under feeder line, all devices generates topological tree.
As shown in Figure 1: between two feeder lines of bus1 and bus2, interconnection switch closes the situation of position, and when bus1, bus2 side, load is total
Be all higher than or during power measurement (such as: 100kW) of the most respective service entrance switch, illustrate to measure inaccurate, the most do not generate and open up
Flutter tree；If bus1 side total load measures less than bus1 side service entrance switch, and bus2 side total load is more than bus2 side service entrance switch amount
Survey, illustrate that interconnection switch power is flowed to bus2 by bus1, by the service entrance switch of bus2 side, travel through according to electric connecting relation
Divide the regular tap of position, till the loading assembled is more than service entrance switch, using point bit switch of this switch upstream as untiing
The switch of looped network, generates topological tree with this switch untiing looped network for cut-off condition to bus1 Yu bus2 side respectively；Vice versa.
After Fig. 1, all feeder lines being generated topological tree, the process generating topological tree is: disregard the state of switch/disconnecting link,
Carrying out depth-first search with the interconnection switch of point position or the switch specified for border, the present invention only generates for the time being and comprises mother
The topological tree of line, switch/disconnecting link, load/distribution transforming equipment, searchable equipment.During topology, with root node, (transformer station goes out
Mouthful bus) to line end recursive search, and mark the flow direction of power, i.e. come really according to nd or znd first searching equipment
The power flow direction of this equipment fixed.
3, switch remote signalling identification
Upstream and downstream topological relation, the state of upstream equipment and measuring value according to equipment, upstream device be the most charged, with or without
The information such as other plant-grid connection state based on following principle judgement switch:
Divide position state of switch/disconnecting link downstream to connect the load/distribution transforming measuring absolute value more than 0, and supply without other power supply
Electricity, then this switch/disconnecting link of accurate recognition is for closing position and being modified to close position；
State point position and measure absolute value switch/disconnecting link downstream more than 0 and do not have load/distribution transforming, switch/disconnecting link state and
Measuring the situation of contradiction, this switch/disconnecting link remote signalling is suspicious；
Switch/disconnecting link state closes position, downstream load/distribution transforming and switch measure be 0 and upstream without the switch/cutter of point position
Lock, then this switch/disconnecting link remote signalling is suspicious.
For the switch of wobble variation, owing to its time of day cannot be determined, use the above principle can be with accurate recognition
Close position, or be recognized as suspicious point of position.
Detailed process is:
I) traversal measures the load/distribution transforming more than 0, the hierarchical relationship in topological tree find the on-load switch of upstream, if
This on-load switch divides position, then this on off state mistake is described, and is modified to close position；
J) regular tap of position is divided to the direction of circuit head end traversal with line end, with this switch to line end (root
Determine according to power flow direction) search for the load/distribution transforming measured more than 0 or be modified to close the switch of position, if searching, then this point of position
Regular tap status error, and be modified to close position；If not searching the magnitude of current of the regular tap of load/distribution transforming and this point of position
Survey more than 0, then illustrate that this point of bit switch state is suspicious；
K) traversal measurement is the load/distribution transforming of 0, according to the conjunction bit switch of the hierarchical relationship search upstream in topological tree, if
The conjunction bit switch current measurement searched is 0, and this conjunction bit switch does not exist the switch of point position to root node, then illustrate that this closes position
On off state is suspicious；
L) switch is after identification terminates, it is judged that the switch of the switch of accurate recognition/suspicious identification whether wobble variation, if so,
Then save as and accurately close position or suspicious point of position.
In Fig. 2, switch k2, k3 are the switch that state is suspicious.
4, remote measurement polishing
After remote signalling identification, distribution sub-island generate, add up the injecting power of each junction point in each distribution sub-island, through with
Lower process determines electric current and the power of branch road:
K) assume that the whole network voltage is root node voltage U, it is known that each junction point power, branch resistance G and reactance B parameter, depend on
Branch power can be calculated according to following equation；
L) against power flow direction, calculate forward with branch power according to node injecting power, calculate each branch power and electricity
Stream；
M) along power flow direction, according to each branch power and first section of node voltage, branch voltage fall and each node electricity are calculated
Pressure；
N) two processes of b, c are repeated, until the voltage difference of all nodes less than a limit value or reaches the meter specified
Till calculating number of times；
O) close line segment serial number sec, zsec that the switch both sides of position connect, find with not line segment sequence number for the side of-1
Line segment, with this line segment electric current, meritorious, the electric current of idle polishing switch, power measurement；If sec Yu isec is-1, statistic switch
The line segment that both sides connect, if the node number zbs of the line segment other end is more than the bs of switch, the most respectively by this line current, meritorious, nothing
Merit is sued for peace, with the electric current of result polishing switch, power measurement after summation.
As shown in Figure 3: with electric current, the corresponding measurement of power sum polishing switch of line segment sec1, sec2, sec3.
5, cyclization analysis
After generating topological tree remote signalling identification, carry out sectional, bus analysis, electrical island analysis generation distribution sub-island.
For closed loop design, the power distribution network of open loop operation, owing to switch combination operation, the remote signalling data problem of instantaneity cause between feeder line
Cyclization.Show as searching another substation exit bus from a substation exit bus when electrical island is analyzed.Before employing
Push back and cannot process the situation of cyclization between this feeder line for Load flow calculation, when generating distribution sub-island, by the feedback of cyclization between feeder line
Line filters, and is not involved in Load flow calculation and measures polishing.Wherein, dual power supply (actual can only be passed through prepared auto restart by power supplying from one direction
Equipment determines) situation be not belonging to cyclization, the load of dual power supply need to be split into two independent loads, respectively by two ends
Power supply is powered, and cyclization filters out the situation of dual power supply when analyzing.
6, examination statistics
After remote signalling identification correction, with a point position state, the switch of power measurement is had to generate section for border, in section
The switch of trip is that power flows into switch, and remaining flows out switch for power, and the difference calculating power carries out regional imbalance statistics, no
Aequum comprises meritorious with idle；Setting voltage bound (such as: 10.7,9.3), busbar voltage measures compared with voltage bound
Carrying out the out-of-limit statistics of busbar voltage, for single phase model, voltage takes AB phases line voltage；Take current measurement in A, B, C three-phase maximum
Value carries out switching heavy duty/out-of-limit analysis with the rupturing capacity of switch, and being less than 100% more than setting value (such as: 80%) is heavy duty, greatly
It is out-of-limit in 100%；The reason of topology failure feeder line is divided into: feeder line can not find bus, feeder line can not find service entrance switch and feeder line
Between cyclization；During generating distribution sub-island, searching another outlet bus then cyclization with side substation exit bus, statistics is closed
Ring feeder line；To each distribution sub-island, its island internal loading summation and service entrance switch power measurement carry out initial network loss statistics；Through examining
Nuclear statistics function, the result of display state directly perceived estimation and effect.
7, daily load prediction
The partial data section that Historic Section Data Matching obtains, has 96 complete data section every day, by every day 96
Individual data section obtains 288 data section every day according to linear interpolation method, according to similar day (the 10 days forward date to be predicted
The load data on similar date) and the Forecasting Methodology of linear extrapolation, for with adopting the distribution transforming that distribution transforming matches, carry out daily load
Prediction.The load data of 24 hours days to be predicted can be predicted, carry out real-time status estimation in conjunction with distribution main website real time data.
The key problem in technology point of the present invention and to be intended to protect be a little what
1. the Historic Section number that electrical power distribution automatization system main website profile data mates with between extraction system distribution transforming profile data
According to coupling.
2. annexation and hierarchical relationship, electriferous state, measuring value according to upstream and downstream equipment carry out switching/disconnecting link remote signalling
Identification.
3. to switch the switching current of power flow solutions polishing measurement disappearance of associate device, quantity of power after approximation Load flow calculation
Measured value, completes to switch remote measurement polishing.
4. load/distribution transforming the historical data of linear interpolation method completion disappearance, similar day is born with linear extrapolation prediction distribution transforming
Lotus.
Claims (4)
1. the practical approach that a power distribution network simple state is estimated, it is characterised in that described method comprises the steps:
(1) Historic Section Data Matching
Read with extraction system 96 power curve data every day and corresponding section moment, access time in distribution main website section
Closest to section and the section in first 5 minutes of this section moment and latter 5 minutes in this section moment, choose the power with adopting distribution transforming bent
Line is gained merit data, sets up main website distribution transforming with adopting the matching relationship of distribution transforming by platform area code, breaks by calculating between two systems 3
The distribution transforming active power error matched in face, splices with extraction system with the main website section that error is minimum, with disconnected with adopting
The face moment is as the section moment of section complete after splicing；With match with the power curve data assignment main website side adopting distribution transforming
Distribution low-voltage winding power measures；
(2) power distribution network topological tree generates
First, Article 1 line bus1 and Article 2 line bus2 represents that between two feeder lines, interconnection switch closes the situation of position, works as Article 1
Line bus1, Article 2 line bus2 side load summation are all higher than or the power measurement (such as: 100kW) of the most respective service entrance switch
Time, illustrate to measure and forbidden, the most do not generate topological tree；If Article 1 line bus1 side total load is less than Article 1 line bus1 side inlet wire
Switch measures, and Article 2 line bus2 side total load measures more than Article 2 line bus2 side service entrance switch, and interconnection switch merit is described
Rate is flowed to Article 2 line bus2 by Article 1 line bus1, by the service entrance switch of Article 2 line bus2 side, according to electrical connection
Relationship traversal divides the regular tap of position, till the loading assembled is more than service entrance switch, by point bit switch of this switch upstream
As untiing the switch of looped network, respectively Article 1 line bus1 is untied the switch of looped network for cut-off with Article 2 line bus2 side with this
Condition generates topological tree；Vice versa；
Through above-mentioned steps, all feeder lines being generated topological tree, the process generating topological tree is: disregard the state of switch/disconnecting link,
Carry out depth-first search with the interconnection switch of point position or the switch specified for border, generate comprise bus, switch/disconnecting link,
The topological tree of load/distribution transforming equipment, searchable equipment；During topology, with the i.e. substation exit bus of root node to circuit
End recursive search, and mark the flow direction of power, i.e. according to first searching nd or znd of equipment to determine the power of this equipment
Flow to；
(3) switch remote signalling identification
Upstream and downstream topological relation, the state of upstream equipment and measuring value according to equipment, upstream device are the most charged, with or without other
The information such as plant-grid connection state based on following principle judgement switch:
Divide position state of switch/disconnecting link downstream to connect the load/distribution transforming measuring absolute value more than 0, and power without other power supply, then
This switch/disconnecting link of accurate recognition is for closing position and being modified to close position；
State point position and measurement absolute value switch/disconnecting link downstream more than 0 do not have load/distribution transforming, switch/disconnecting link state and measurement
The situation of contradiction, this switch/disconnecting link remote signalling is suspicious；
Switch/disconnecting link state closes position, downstream load/distribution transforming and switch measure be 0 and upstream without the switch/disconnecting link of point position, then
This switch/disconnecting link remote signalling is suspicious；
For the switch of wobble variation, owing to its time of day cannot be determined, use above principle can with accurate recognition for close position,
Or it is recognized as suspicious point of position；
(4) remote measurement polishing
After remote signalling identification, distribution sub-island generate, add up the injecting power of each junction point in each distribution sub-island, through following mistake
Journey determines electric current and the power of branch road:
A) assume that the whole network voltage is root node voltage U, it is known that each junction point power, branch resistance G and reactance B parameter, according under
Row formula can calculate branch power；
B) against power flow direction, calculate forward with branch power according to node injecting power, calculate each branch power and electric current；
C) along power flow direction, according to each branch power and first node voltage, branch voltage fall is calculated；
D) two processes of b, c are repeated, until the voltage difference of all nodes less than a limit value or reaches the calculating time specified
Till number；
E) close line segment serial number sec, zsec that the switch both sides of position connect, find line with not line segment sequence number for the side of-1
Section, with this line segment electric current, meritorious, the electric current of idle polishing switch, power measurement；If sec Yu isec is-1, statistic switch two
The line segment that side connects, if the node number zbs of the line segment other end is more than the bs of switch, the most respectively by this line current, meritorious, idle
Sue for peace, with the electric current of result polishing switch, power measurement after summation；
(5) cyclization analysis
After generating topological tree remote signalling identification, carry out sectional, bus analysis, electrical island analysis generation distribution sub-island；
(6) examination statistics
After remote signalling identification correction, with a point position state, the switch of power measurement is had to generate section for border, with section middle and upper reaches
Switching and flow into switch for power, remaining flows out switch for power, and the difference calculating power carries out regional imbalance statistics, uneven
Amount comprises meritorious with idle；Setting voltage bound, it is out-of-limit that busbar voltage measurement carries out busbar voltage compared with voltage bound
Statistics, for single phase model, voltage takes AB phases line voltage, takes the blocking of current measurement maximum and switch in A, B, C three-phase and holds
Amount carries out switching heavy duty/out-of-limit analysis；Being less than 100% more than setting value is heavy duty, is out-of-limit more than 100%；
The reason of topology failure feeder line is divided into: feeder line can not find bus, feeder line can not find cyclization between service entrance switch and feeder line；Generate
During distribution sub-island, search another outlet bus then cyclization with side substation exit bus, add up cyclization feeder line；To often
Individual distribution sub-island, its island internal loading summation and service entrance switch power measurement carry out initial network loss statistics；Through examination statistical function,
The result of display state estimation directly perceived and effect；
(7) daily load prediction
The partial data section that Historic Section Data Matching obtains, has 96 complete data section every day, by number every day 96
288 data section every day are obtained according to linear interpolation method, according to similar day date the most to be predicted 10 days phases forward according to section
Like load data and the Forecasting Methodology of linear extrapolation on date, for with adopting the distribution transforming that distribution transforming matches, carry out daily load pre-
Survey；Predict the load data of 24 hours days to be predicted, carry out real-time status estimation in conjunction with distribution main website real time data.
The practical approach that a kind of power distribution network simple state the most according to claim 1 is estimated, it is characterised in that: described step
(1) in, for a distribution transforming unmatched, occur the most in pairs, belonging to this distribution transforming if winding power measurement in high-pressure side is meritorious, idle
The power factor of the service entrance switch of feeder line calculates idle, makes that distribution transforming high-pressure side is meritorious, idle measurement occurs in pairs；If main website high pressure
Side load is without measuring, then the power measurement assignment high-pressure side winding power of the on-load switch connected with this distribution transforming measures, and wants equally
Ensure meritorious, idle paired appearance.
The practical approach that a kind of power distribution network simple state the most according to claim 1 is estimated, it is characterised in that described step
(3) detailed process is:
A) traversal measures the load/distribution transforming more than 0, the hierarchical relationship in topological tree find the on-load switch of upstream, if this is born
Lotus switch point position, then illustrate this on off state mistake, and be modified to close position；
B) regular tap of position is divided to the direction of circuit head end traversal with line end, with this switch to line end (according to merit
Rate flows to determine) search for the load/distribution transforming measured more than 0 or be modified to close the switch of position, if searching, then this point of position is general
Open up off status mistake, and be modified to close position；If the current measurement not searching the regular tap of load/distribution transforming and this point of position is big
In 0, then illustrate that this point of bit switch state is suspicious；
C) traversal measurement is the load/distribution transforming of 0, according to the conjunction bit switch of the hierarchical relationship search upstream in topological tree, if search
To conjunction bit switch current measurement be 0, and there is not the switch of point position in this conjunction bit switch to root node, then illustrate that this closes bit switch
State is suspicious；
D) switch is after identification terminates, it is judged that the switch of the switch of accurate recognition/suspicious identification whether wobble variation, the most then protect
Save as and accurately close position or suspicious point of position.
The practical approach that a kind of power distribution network simple state the most according to claim 1 is estimated, it is characterised in that described step
(5) in, for closed loop design, the power distribution network of open loop operation, owing to switch combination operation, the remote signalling data problem of instantaneity cause
Cyclization between feeder line；Show as searching another substation exit bus from a substation exit bus when electrical island is analyzed,
Push back before employing and cannot process the situation of cyclization between this feeder line for Load flow calculation, when generating distribution sub-island, will close between feeder line
The feeder line of ring filters, and is not involved in Load flow calculation and measures polishing；Wherein, dual power supply is actual can only be passed through by power supplying from one direction
The situation that prepared auto restart equipment determines is not belonging to cyclization, the load of dual power supply need to split into two independent loads, respectively
Being powered by two ends power supply, cyclization filters out the situation of dual power supply when analyzing.
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