CN108649573A - A kind of computational methods for causing grid net loss to change by power transmission and transforming equipment maintenance - Google Patents
A kind of computational methods for causing grid net loss to change by power transmission and transforming equipment maintenance Download PDFInfo
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Abstract
A kind of computational methods for causing grid net loss to change by power transmission and transforming equipment maintenance proposed by the present invention, belong to electric power overhaul technical field, this method calculates before having maintenance, calculates two kinds of calculating patterns after maintenance, and service information and Historic Section are obtained respectively according to two kinds of calculating patterns；Integration period is set according to the repair time；For the Historic Section of different moments, the electricity of each Historic Section grid loss in the latter integration period before contrary operation is calculated；It sums respectively to obtain the total Energy loss of the forward and backward power grid of contrary operation；According to equipment original state, the total Energy loss of power grid under putting equipment in service, stoppage in transit state is respectively obtained, finally obtains grid net loss variation before and after overhaul of the equipments is stopped transport.The present invention can be when repair schedule be formulated, for grid net loss situation of change caused by analytical equipment maintenance, with this reasonable arrangement repair schedule.
Description
Technical field
The invention belongs to electric power overhaul technical fields, more particularly to a kind of to cause grid net loss to become by power transmission and transforming equipment maintenance
The computational methods of change.
Background technology
Electric energy is secondary energy sources obtained from being converted by primary energy, can be converted into mechanical energy, thermal energy, magnetic energy etc..With
The development of society, oneself warp of electric energy becomes the lifeblood of the national economic development, and application has been deep into each neck of production, life
Domain.
Power grid be unable to do without power transmission and transforming equipment, therefore ensure power transmission and transforming equipment just during conveying and distributing electric energy
Often operation work is particularly important.The power transmission and transforming equipment of normal operation is likely to break down, and it requires and is set to power transmission and transformation
Standby to be overhauled, so-called maintenance makes sure that equipment keeps realizing the state of its design function.And the purpose overhauled is to reduce
The frequency of equipment fault reduces the influence of equipment fault, extends the service life of equipment.
Power transmission and transforming equipment service work is the important process for ensureing power equipment safety operation.Maintenance be generally divided into A,
B, C, D, E Pyatyi, wherein A, B, C are interruption maintenance, and D, E are non-interruption maintenance, specifically：A grades of maintenance refer to globality maintenance,
It is tested after carrying out more comprehensively disintegration (line facility replacement) to equipment, check, repair and repair, with holding, restorer performance；
B grades of maintenance refer to locality maintenance, carry out overhaul, repairing to environment division functional component, replace and tested after repairing, to protect
It holds, restorer performance；C grades of maintenance refer to general maintenance, the preventive trial that is carried out under power failure to equipment, generality
Defect elimination, inspection, maintenance and cleaning, to keep and verify the normal performance of equipment；D grades of maintenance refer to maintainability maintenance, exist to equipment
The live testing carried out under live state and equipment appearance inspection, maintenance, maintenance, to ensure the normal function of equipment；E grades of inspections
Repair equipotential maintenance, defect elimination, the maintenance in the case of referring to equipment live.
Since there is resistance for power transmission and transforming equipment, when electric current flows through, a certain number of active power losses are just will produce,
Within the given period (day, the moon, season, year), the whole active energies consumed in each grid equipment are known as Energy loss, generally
The active energy (abbreviation loss on transmission) that the active energy (abbreviation line loss) and transformer equipment consumed including line facility is consumed.
And overhaul of the equipments can stop transport to equipment, and electric network swim will be caused to change, and cause the variation of grid net loss.
The calculation of grid net loss can be divided into statistics loss and two class of theoretical loss.Statistics loss is according to electric energy
Table indicated number calculates, and the data dependent on electric energy meter acquire, layouted with gathered data real-time by electric energy meter etc.
Constraint, it is difficult to for carrying out online analysis.Theoretical loss is the structural parameters and operating parameter according to power grid, with electrician's original
Theory in reason and electricity, by the voltage of each transmission facility, electric current and corresponding loss calculation included in electric network model
Out, the loss being calculated in this way is referred to as theoretical loss, and the theoretical loss of entire power grid, which is in electric network model, includes
The sum of the theoretical loss of whole electrical equipments.Theoretical loss calculating can carry out online, and real-time is high, do not layouted by ammeter and
The limitation of acquisition can be used for real-time grid net loss analysis and calculate.Li Xuyang, Xing Bo《Real-time theoretical line loss caluclation analysis
The realization of system》It illustrates to be calculated according to electric network swim in (power informatization, 2007, the 10th phase of volume 5,63-65 pages)
The equipment effective power flow value arrived calculates Δ PijMethod, give a kind of application process of online theory nework losses.
It is a kind of calculating for studying power system mesomeric state operating condition that electric power system tide, which calculates, it is according to given number
According to calculating the voltage of busbar, the power and network loss of each element, and assess the operating status of power grid everywhere.Further according to meter
Obtained data are monitored and optimize to the operation of network system, to improve the reasonable of power supply plan or the method for operation
Property, reliability and economy.For the electric system being currently running, current system median generatrix can be assessed by Load flow calculation
Voltage, branch the parameters such as power whether transfinite；It if there is exception, should just take measures, adjust the method for operation.
Electric network swim equation under polar coordinates can be expressed as：
Wherein, wherein ViFor the amplitude of busbar i voltages, θiFor the phase angle of busbar i voltages, VjFor the amplitude of busbar j voltages,
θjFor the phase angle of busbar j voltages, I indicates the set for the busbar j being connect with busbar i by branch；gijFor connection busbar i and busbar
The conductance of the branch of j, bijFor the susceptance of branch.PGiFor the active power power generation on busbar i, PDiFor the active power on busbar i
Load, QGiIt generates electricity for the reactive power of busbar i, QDiFor the reactive power load on busbar i.
It is as follows that Branch Power Flow calculation expression can be further obtained from above-mentioned trend mode：
Wherein PijThe active power flow flowed on branch to connect busbar i and its adjacent busbar j, PijIndicate from
Busbar i flows to the trend of busbar j, PjiExpression flows to the effective power flow of busbar j from busbar j；Branch includes the circuit for connecting busbar
Or transformer winding.QijFor branch reactive power trend, ycIndicate half admittance of circuit.
Load flow calculation can determine the steady-state operating condition of power grid in the case where electric network composition parameter determines.In power grid
Node can be divided into PQ nodes, PV node and V θ nodes according to given variable difference, and what is calculated is that electric network state variable saves
Point voltage magnitude and phase angle.Power flow equation is one group of high-order nonlinear Algebraic Equation set, uses solution by iterative method.Newton-pressgang
Inferior power flow algorithm is the power flow algorithm for having Quadratic Convergence, therefore is widely used.But refined due to this method can
It is state variable function to be asked than matrix, so to re-form Jacobian matrix in an iterative process and carry out Gaussian reduction
It solves, the calculation amount of each iteration is larger.Since it is the basis of various tidal current computing methods, there is it in electrical network analysis
Consequence.
With the fast development of power grid, in the case that electric network composition becomes increasingly complex, the interruption maintenance of equipment is by direct shadow
The safety and stability to electric system during maintenance is rung, therefore electric company pays the utmost attention to ensure when repair schedule is formulated
Power grid security, reliable, stable operation carry out various safety checks and evaluation to overhaul of the equipments, but cause to overhaul of the equipments
Grid net loss situation of change, lack effective calculating, evaluation measures at present.
Invention content
The purpose of the present invention is overcome formulate power transmission and transformation repair schedule when, can not effectively assessment equipment maintenance cause power grid net
The problem of damage variation, proposes that a kind of computational methods for causing grid net loss to change by power transmission and transforming equipment maintenance, the present invention have inspection
Two kinds of calculating patterns are calculated after repairing preceding calculating, maintenance, and can integration period be set automatically according to the repair time, can be counted in maintenance
Timing is drawn, for grid net loss situation of change caused by analytical equipment maintenance.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of computational methods for causing grid net loss to change by power transmission and transforming equipment maintenance, which is characterized in that this method includes
Following steps：
(1) calculating pattern is selected, has maintenance preceding and maintenance latter two calculates pattern；If calculated before selection maintenance,
It enters step (2)；If calculated after selection maintenance, enter step (3)；
(2) typical day of the selection for being calculated before overhauling service information, including device name, repair time are obtained, obtained
The Historic Section of typical day；It enters step (4)；It is described typical case day be and the power grid overall operation mode of scheduled overhaul day, power generation
Horizontal, the load level similar date；The Historic Section is the electrical ginseng for storing topological structure of electric, power grid primary equipment
Number, the active power of power generator and reactive power, the active power of duty value and reactive power, grid circuit breaker and every
The data packet of division status information from disconnecting link；
(3) service information, including repair apparatus title, repair time are obtained；Obtain the Historic Section of maintenance day；Into step
Suddenly (4)；
(4) integration period T is arranged according to the repair time, for calculating grid net loss electricity；Historic Section is total needed for determining
Number
(5) maintenance start time t is read0Historic Section, the state of the moment equipment is judged, if equipment is to put into operation shape
State, then it is the state that puts into operation to record this secondary device original state；If equipment is stoppage in transit state, this secondary device original state is recorded
For stoppage in transit state；By Load flow calculation, the active power and reactive power of each branch of power grid are obtained, and obtain the moment power grid to have
Work(is lostBy equipment contrary operation, then by Load flow calculation, the active power of each branch of power grid and idle work(are obtained
Rate, and obtain moment electric network active loss
(6) it reads and last moment t0T at the time of Historic Section interval time T1Historic Section, judge the moment equipment
State it is whether consistent with original state, by Load flow calculation if consistent, obtain the active power and nothing of each branch of power grid
Work(power, and obtain moment electric network active lossBy equipment contrary operation, then by Load flow calculation, power grid is obtained
The active power and reactive power of each branch, and obtain moment electric network active lossIt enters step (7)；
(7) it takes trapezoidal method to be integrated, obtains moment t1An integration period T of the Historic Section before contrary operation,
That is t0~t1The electricity of grid loss in period：
It takes trapezoidal method to be integrated, obtains moment t1An integration period T, i.e. t of the Historic Section after contrary operation0
~t1The electricity of grid loss in period：
(8) step (6)~(7) are repeated, each Historic Section is successively read, respectively obtains i-th of Historic Section contrary operation
Before obtainIt is obtained after i-th of Historic Section contrary operationUntil maintenance terminates；Wherein,
It is rightSummation, obtains the total Energy loss of power grid before contrary operation：
It is rightSummation, obtains the total Energy loss of power grid after contrary operation：
(9) if equipment original state is the state that puts into operation, the total Energy loss of power grid is under putting equipment in service stateThe total Energy loss of power grid is under equipment stoppage in transit stateIf equipment original state is stoppage in transit shape
State, then the total Energy loss of power grid is under putting equipment in service stateThe total Energy loss of power grid is under equipment stoppage in transit stateThe total Energy loss changing value of power grid caused by power transmission and transforming equipment overhauls as a result,：
If Δ Eloss>0, then grid net loss increases after overhaul of the equipments is stopped transport, if Δ Eloss<0, then power grid net after overhaul of the equipments is stopped transport
Damage is reduced.
The characteristics of the method for the present invention and advantageous effect are：
The present invention calculates before having maintenance, calculates two kinds of calculating patterns after maintenance, and product is arranged automatically according to the repair time
Divide the period, can provide grid net loss variation caused by power transmission and transforming equipment maintenance when repair schedule is formulated, can be reasonable arrangement
Repair schedule provides certain reference.
Specific implementation mode
Technical scheme of the present invention is further described with reference to embodiment as follows：
A kind of computational methods for causing grid net loss to change by power transmission and transforming equipment maintenance proposed by the present invention, including following step
Suddenly：
(1) calculating pattern is selected, has maintenance preceding and maintenance latter two calculates pattern；If calculated before selection maintenance,
It enters step (2)；If calculated after selection maintenance, enter step (3)；
This method provides two kinds of calculating patterns, including：It is calculated before maintenance, caused network loss is changed by scheduled overhaul and is carried out
It calculates；It is calculated after maintenance, network loss variation caused by scheduled overhaul, trouble hunting for having completed etc. is calculated；
(2) typical day of the selection for being calculated before overhauling service information, including repair apparatus title, repair time are obtained
Deng the Historic Section information of acquisition typical day；It enters step (4)；
Typical day is the date similar with the power grid overall operation mode of scheduled overhaul day, power generation level, load level；It goes through
History section is to store topological structure of electric, the electric parameter of power grid primary equipment, the active power of power generator and idle
The data packet of the division status information of power, the active power of duty value and reactive power, grid circuit breaker and isolation switch,
It is provided by SCADA (data acquire and monitoring controls) system of electric company, the general storage period is 5 minutes；
Wherein, repair schedule file is provided by maintenance department of electric company, and this document contains the title of repair apparatus, maintenance
The information such as time, as shown in the table：
| Serial number | Overhaul unit | Affiliated plant stand | Repair apparatus title | Device type | Overhaul the time started | Overhaul the end time |
| 1 | A electric companies | B substations | C circuits | Circuit | 2018-01-01 09:00:00 | 2018-01-0117:00:00 |
(3) service information, including repair apparatus title, repair time etc. are obtained, acquisition modes are：Read repair schedule text
Part；Obtain the Historic Section of maintenance day；It enters step (4)；
Wherein, repair schedule file is provided by maintenance department of electric company, and this document contains the title of repair apparatus, maintenance
The information such as time, as shown in the table：
| Serial number | Overhaul unit | Affiliated plant stand | Repair apparatus title | Device type | Overhaul the time started | Overhaul the end time |
| 1 | X electric companies | Y substations | Z main transformers | Transformer | 2018-01-01 00:00:00 | 2018-01-02 00:00:00 |
(4) integration period T is arranged according to the repair time to be as follows for calculating grid net loss electricity：
This method integration period can be arranged automatically according to the repair time, and the repair time span of power transmission and transforming equipment is general
For a few hours to a couple of days；If the repair time is not more than 6 hours, it is 15 minutes that integration period T, which is arranged,；If when repair schedule
Between be more than 6 hours but be not more than 12 hours, then be arranged integration period T be 30 minutes；If the repair schedule time is more than 12 hours
But it is not more than 24 hours, then it is 60 minutes that integration period T, which is arranged,；If the repair schedule time is more than 24 hours, integral is set
Cycle T is 120 minutes；In conjunction with the repair time, can obtain calculating required Historic Section sum
(5) maintenance start time t is read0Historic Section, the state of the moment equipment is judged, if equipment is to put into operation shape
State, then it is the state that puts into operation to record this secondary device original state；If equipment is stoppage in transit state, this secondary device original state is recorded
For stoppage in transit state；By Load flow calculation (for conventional tidal current computing method), the active power of each branch of power grid and idle is obtained
Power, and obtain moment electric network active lossBy equipment contrary operation, i.e., if equipment original state is to put into operation,
It is allowed to stop transport, if equipment original state is to stop transport, is allowed to put into operation, then by Load flow calculation, obtains each branch of power grid
Active power and reactive power, and obtain moment electric network active loss
Power transmission and transforming equipment overhauls, and relates generally to line and transformer, and equipment is stopped transport when maintenance, i.e., equipment connecting valve is disconnected
It opens, keeps equipment not charged；Complete electric network information is stored in Historic Section, includes device name, equipment connecting relation, because
This can find the switch of its connection according to repair apparatus title；If equipment original state is the state that puts into operation, contrary operation
Refer to that the on off state for connecting equipment is set to point, the equipment is made to stop transport, if equipment original state is stoppage in transit state, inversely
Operation refers to that the on off state for connecting equipment is set to conjunction, makes the putting equipment in service；
(6) it reads and last moment t0T at the time of Historic Section interval time T1Historic Section, judge the moment equipment
State it is whether consistent with original state, by Load flow calculation if consistent, obtain the active power and nothing of each branch of power grid
Work(power, and obtain moment electric network active lossBy equipment contrary operation, i.e. equipment original state is to put into operation, then makes
Stoppage in transit, equipment original state be stop transport, then be allowed to put into operation, then by Load flow calculation, obtain the wattful power of each branch of power grid
Rate and reactive power, and obtain moment electric network active lossIt enters step (7)；
(7) it takes trapezoidal method to be integrated, obtains moment t1An integration period T of the Historic Section before contrary operation,
That is t0~t1The electricity of grid loss in period：
It takes trapezoidal method to be integrated, obtains moment t1An integration period T, i.e. t of the Historic Section after contrary operation0
~t1The electricity of grid loss in period：
(8) step (6)~(7) are repeated, each Historic Section is successively read, respectively obtains i-th of Historic Section contrary operation
Before obtainIt is obtained after i-th of Historic Section contrary operationUntil maintenance terminates；Wherein,
It is rightSummation, obtains the total Energy loss of power grid before contrary operation：
It is rightSummation, obtains the total Energy loss of power grid after contrary operation：
(9) if equipment original state is the state that puts into operation, the total Energy loss of power grid is under putting equipment in service stateThe total Energy loss of power grid is under equipment stoppage in transit stateIf equipment original state is stoppage in transit shape
State, then the total Energy loss of power grid is under putting equipment in service stateThe total Energy loss of power grid is under equipment stoppage in transit stateThe total Energy loss changing value of power grid caused by power transmission and transforming equipment overhauls as a result,：
If Δ Eloss>0, then grid net loss increases after overhaul of the equipments is stopped transport, if Δ Eloss<0, then power grid net after overhaul of the equipments is stopped transport
Damage is reduced.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (2)
1. it is a kind of by power transmission and transforming equipment maintenance cause grid net loss change computational methods, which is characterized in that this method include with
Lower step：
(1) calculating pattern is selected, has maintenance preceding and maintenance latter two calculates pattern；If calculated before selection maintenance, enter
Step (2)；If calculated after selection maintenance, enter step (3)；
(2) typical day of the selection for being calculated before overhauling service information, including repair apparatus title, repair time are obtained, obtained
The Historic Section of typical day；It enters step (4)；It is described typical case day be and the power grid overall operation mode of scheduled overhaul day, power generation
Horizontal, the load level similar date；The Historic Section is the electrical ginseng for storing topological structure of electric, power grid primary equipment
Number, the active power of power generator and reactive power, the active power of duty value and reactive power, grid circuit breaker and every
The data packet of division status information from disconnecting link；
(3) service information, including repair apparatus title, repair time are obtained；Obtain the Historic Section of maintenance day；It enters step
(4)；
(4) integration period T is arranged according to the repair time, for calculating grid net loss electricity；Historic Section sum needed for determining
(5) maintenance start time t is read0Historic Section, judge the state of the moment equipment, if equipment is to put into operation state,
It is the state that puts into operation to record this secondary device original state；If equipment is stoppage in transit state, it is to stop to record this secondary device original state
Fortune state；By Load flow calculation, the active power and reactive power of each branch of power grid are obtained, and obtains moment electric network active damage
ConsumptionBy equipment contrary operation, then by Load flow calculation, the active power and reactive power of each branch of power grid are obtained, and
Obtain moment electric network active loss
(6) it reads and last moment t0T at the time of Historic Section interval time T1Historic Section, judge the shape of the moment equipment
Whether state is consistent with original state, by Load flow calculation if consistent, obtains the active power of each branch of power grid and idle work(
Rate, and obtain moment electric network active lossBy equipment contrary operation, then by Load flow calculation, each of power grid is obtained
The active power and reactive power on road, and obtain moment electric network active lossIt enters step (7)；
(7) it takes trapezoidal method to be integrated, obtains moment t1An integration period T, i.e. t of the Historic Section before contrary operation0~
t1The electricity of grid loss in period：
It takes trapezoidal method to be integrated, obtains moment t1An integration period T, i.e. t of the Historic Section after contrary operation0~t1
The electricity of grid loss in period：
(8) step (6)~(7) are repeated, each Historic Section is successively read, are obtained before respectively obtaining i-th of Historic Section contrary operation
It arrivesIt is obtained after i-th of Historic Section contrary operationUntil maintenance terminates；Wherein,
It is rightSummation, obtains the total Energy loss of power grid before contrary operation：
It is rightSummation, obtains the total Energy loss of power grid after contrary operation：
(9) if equipment original state is the state that puts into operation, the total Energy loss of power grid is under putting equipment in service state
The total Energy loss of power grid is under equipment stoppage in transit stateIf equipment original state is stoppage in transit state, equipment
The total Energy loss of power grid is under the state that puts into operationThe total Energy loss of power grid is under equipment stoppage in transit stateThe total Energy loss changing value of power grid caused by power transmission and transforming equipment overhauls as a result,：
If Δ Eloss>0, then grid net loss increases after overhaul of the equipments is stopped transport, if Δ Eloss<0, then power grid net after overhaul of the equipments is stopped transport
Damage is reduced.
2. causing the computational methods that grid net loss changes by power transmission and transforming equipment maintenance as described in claim 1, which is characterized in that
The step (4) according to the repair time be arranged integration period T the specific steps are：
If the repair time is not more than 6 hours, it is 15 minutes that integration period T, which is arranged,；If the repair time is more than 6 hours but not
More than 12 hours, then it was 30 minutes that integration period T, which is arranged,；If the repair time is more than 12 hours but is not more than 24 hours, set
It is 60 minutes to set integration period T；If the repair time is more than 24 hours, it is 120 minutes that integration period T, which is arranged,.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390936A (en) * | 2018-10-26 | 2019-02-26 | 国网河北省电力有限公司 | A kind of regional power grid line losses management method considering interconnection trend adjustment |
| CN113884758A (en) * | 2021-09-29 | 2022-01-04 | 广东电网有限责任公司 | Direct current electric energy metering method, device, equipment and storage medium |
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| JP2004133663A (en) * | 2002-10-10 | 2004-04-30 | Toshiba Corp | Operating device and method for power generation facility |
| CN103066592A (en) * | 2012-12-17 | 2013-04-24 | 山东电力集团公司济宁供电公司 | Power network loss on-line monitoring method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004133663A (en) * | 2002-10-10 | 2004-04-30 | Toshiba Corp | Operating device and method for power generation facility |
| CN103066592A (en) * | 2012-12-17 | 2013-04-24 | 山东电力集团公司济宁供电公司 | Power network loss on-line monitoring method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390936A (en) * | 2018-10-26 | 2019-02-26 | 国网河北省电力有限公司 | A kind of regional power grid line losses management method considering interconnection trend adjustment |
| CN113884758A (en) * | 2021-09-29 | 2022-01-04 | 广东电网有限责任公司 | Direct current electric energy metering method, device, equipment and storage medium |
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