CN109390936A - A kind of regional power grid line losses management method considering interconnection trend adjustment - Google Patents
A kind of regional power grid line losses management method considering interconnection trend adjustment Download PDFInfo
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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
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Abstract
A kind of regional power grid line losses management method considering interconnection trend adjustment proposed by the present invention, belongs to power system and automation technology.The present invention is according to power grid historical data, set the total load flow rectification amount of transmission cross-section of regional power grid to be calculated and external electrical network, according to each moment power grid history active loss and equipment strength active loss, set the load flow rectification amount of each interconnection in corresponding moment each transmission cross-section, it is whether suitable to verify interconnection trend adjustment amount, trend value after interconnections all in all transmission cross-sections for meeting verification condition adjustment is updated in corresponding moment power grid historical data and corresponds to interconnection trend value, obtain the active loss adjusted of each moment power grid and equipment active loss, finally obtain regional power grid Energy loss and equipment Energy loss adjusted, realize the line losses management to regional power grid under interconnection difference trend mode.The present invention can damage equipment, power grid wastage reducing and energy saving provide foundation again to determine.
Description
Technical field
The invention belongs to power system and automation technologies, in particular to a kind of to consider what interconnection trend adjusted
Regional power grid line losses management method.
Background technique
Interconnected network is formed by multiple regions Power System Interconnection, through interconnection between a small amount of tie-point realizes regional power grid
Synchronous interconnection, have many characteristics, such as voltage levels, big transmission capacity and long distance power transmission.Advantage master possessed by interconnected network
It is embodied in the following aspects:
China's energy resources distribution, power load distributing it is not identical, by between interconnected network it is transregional transprovincially transmission of electricity can be realized water,
Thermoelectricity resources advantage is complementary, preferably utilizes and dissolve the new energy such as wind, photoelectricity；Due to the electrical equipment structure of each regional power grid
It being had differences at, part throttle characteristics, electricity consumption habit, the Peak power use load of each power grid may be not present in the same time,
It mutually staggers, under the same working capacity of entire power grid, support of avoiding the peak hour can be realized by interconnection, reduce system total installed capacity and hold
Amount；To ensure safe operation of power system and uninterruptedly powering to user, electric system has operation standby whether great or small
With, overhaul reserve and emergency duty, after Power System Interconnection, each region power grid just shares entire reserve capacity of power grid, thing is occurring
Therefore when carry out emergency episode and support each other, while can reduce the spare installed capacity of one's respective area power grid；It is entire after Power System Interconnection
Power system capacity increases, and spare capacity is larger, and spare unit increases, and influence of the individual equipment failure to system is opposite to become smaller, and can
Accident support is carried out by interconnection, the unfailing performance of entire power grid accesses raising；Power system load fluctuation can cause frequency
Rate variation, since power system capacity increases after interconnection, supply district expands, and total load fluctuation can be than the load wave of each department
The sum of dynamic to want small, therefore, caused system frequency variation is also opposite to want small, to improve power quality.
Based on above-mentioned advantage, interconnected network receives people and more and more pays close attention to.
Since there is resistance for the electrical equipment in power grid, when electric current flows through, a certain number of wattful powers will be generated
Rate loss, within the given period (day, the moon, season, year), consumed whole active energy is known as network loss electricity in each grid equipment
Amount generally comprises the (letter of active energy consumed by active energy consumed by line facility (abbreviation line loss) and transformer equipment
Claim loss on transmission).When the interconnection trend of interconnected network changes, regional power grid power flow changing will be caused, so as to cause power grid
The variation of network 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, and is layouted and acquired real-time property etc. by electric energy meter
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 included in electric network model and corresponding loss calculation
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.Li Xuyang, Xing Bo " realization of real-time theoretical line loss caluclation analysis system " (electric power
Informationization, 2007, the 10th phase of volume 5,63-65 pages) in illustrate the equipment effective power flow being calculated according to electric network swim
It is worth the method calculated, gives a kind of application method of online theory nework losses.
Load flow calculation described above is according to power transmission network topological structure, the electric parameter of primary equipment, power generator
Active power and reactive power, the active power of duty value and reactive power, breaker and be isolated the division state of plug-in strip with
And the switching state of secondary capacitor or low tension reactor calculates the active power of each equipment of power transmission network, the numerical value of reactive power
Calculation procedure, He Yangzan, Wen Zengyin etc. are in " Power System Analysis (third edition) " (publishing house, the Central China University of Science and Technology, 2002)
It is discussed.
At present in interconnected network actual motion, regional power grid is connected by one or more groups of interconnections with external electrical network,
For system safety, frequency stabilization, each power grid is mainly by unit in automatic voltage control system (AGC) control power grid, according to hair
Electricity, interconnection framework keep system frequency attached in 50Hz in conjunction with load prediction in the case of considering unit limit value and creep speed
In a close allowed band, interconnection trend then real-time change within the allowable range.
Line losses management is to realize power grid wastage reducing and energy saving to determine that power grid damages equipment, finds weak link again.But mesh
The preceding single regional power grid in interconnected network, in one's respective area power grid total load it is constant, with external electrical network always send by it is electric not
Become, in the case where generation load balance, the fresh understatement of research that regional power grid network loss changes caused by adjusting because of interconnection trend
Road.
Summary of the invention
The purpose of the invention is to overcome the shortcoming of prior art, propose what a kind of consideration interconnection trend adjusted
Regional power grid line losses management method, the variation of analyzed area power grid network loss under interconnection difference trend mode are damaged again for determination
Equipment, power grid wastage reducing and energy saving provide foundation.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of regional power grid line losses management method considering interconnection trend adjustment proposed by the present invention, which is characterized in that
Method includes the following steps:
1) model of regional power grid A to be calculated is obtained and loaded from Energy Management System (EMS), which includes region electricity
Net the topological structure of A, the electric parameter of regional power grid A primary equipment, regional power grid A and interconnection parameter of external electrical network etc.；
According to the topological relation of regional power grid A, regional power grid A to be calculated and each external electrical network A are respectively obtainediTransmission cross-section Si, note the
I transmission cross-section SiThe interconnection for including is respectivelyWherein (1, N) i ∈,i、N、j、
It is positive integer, respectively indicates the number of external electrical network, the total number of external electrical network, regional power grid A and i-th external electrical network
Transmission cross-section SiThe transmission cross-section S of the number of middle interconnection and i-th of external electrical networkiContained interconnection sum；
2) note interconnection trend adjustment forefoot area power grid A and external electrical network AiThe total trend of transmission cross-section be Pi his, To adjust preceding transmission cross-section SiIn j-th of interconnection trend value, it is specified that transmission cross-section S before adjustingiIt is interior
The direction of tide of each interconnection is consistent；Note adjustment rear region power grid A and external electrical network AiThe total trend of transmission cross-section be Pi, For transmission cross-section S after adjustmentiIn j-th of interconnection trend value, it is specified that adjustment after transmission cross-section SiIt is interior each
The direction of tide of interconnection is consistent；Remember regional power grid A and external electrical network AiThe total load flow rectification amount of transmission cross-section be Δ Pi, For transmission cross-section SiIn j-th of interconnection load flow rectification amount；Each transmission cross-section is always damp before note adjusts
Current algebra and it isEach total trend algebraical sum of transmission cross-section is after note adjustmentAnd Phis=P,
Read typical day t0The power grid historical data at moment, the historical data include the active power and nothing of power generator
Function power, the active power of transformer and reactive power, the active power of route and reactive power, busbar voltage, duty value
Active power and reactive power, grid circuit breaker and isolation switch the information such as division state, it is known that each transmission cross-section Si
Total trend (adjust before total trend), determine therefrom that total load flow rectification amount Δ Pi, which can be to meet power grid reality
The arbitrary value of situation, and meet Phis=P,
3) typical day t is calculated0The loss of moment history electric network activeIt is lost with electric network active after adjustmentSpecific mistake
Journey is as follows:
3-1) according to the t of reading0Moment power grid historical data obtains in regional power grid model each by Load flow calculation
The active power and reactive power on road, to obtain moment electric network active lossWith equipment active lossidev
∈(1,Ndev),idevFor device numbering, NdevFor equipment sum in power grid；
3-2) set t0Moment transmission cross-section SiThe load flow rectification amount of middle j-th strip interconnection isExpression formula is as follows:
In formula,For t0Moment transmission cross-section SiTotal adjustment amount accounts for transmission cross-section SiThe percentage of total trend,ΔPiThe regional power grid A and external electrical network A determined for step 2)iTransmission cross-section SiTotal trend tune
Whole amount,To adjust preceding t0Moment transmission cross-section SiTotal trend, according to step 2) read t0Moment power grid historical data, will
Transmission cross-section SiInterior interconnection trend sums to obtain；To adjust preceding t0Moment transmission cross-section SiMiddle j-th strip interconnection trend；
T after setting adjustment0Moment transmission cross-section SiThe trend of middle j-th strip interconnection
Interconnection trend adjustment amount 3-3) is verified, trend value, packet after the adjustment of all interconnections are obtained in all transmission cross-sections
Include following steps:
The absolute value of effective power flow on every route of power grid has a safety limit, remembers interconnection effective power flow safety limit
pmax, remember the difference p' of trend absolute value after the safety limit and adjustment, then transmission cross-section SiMiddle interconnectionEffective power flow safety
Limit value is denoted asTransmission cross-section SiMiddle interconnectionSafety limit and adjustment after the difference of trend absolute value be denoted as
3-3-1) to i-th current of transmission cross-section SiDetermined as follows: ifIndicate that the interconnection adjusts
Trend is not out-of-limit afterwards, then enters step 3-3-2)；IfTrend is out-of-limit after indicating interconnection adjustment, needs to get over
Limit is partially distributed to other not out-of-limit interconnections, and specific assigning process is as follows:
3-3-1-1) current transmission cross-section S is calculated according to formula (2)iMiddle interconnectionAdjustment after trend value, in terms of this
Calculate t0Moment interconnectionSafety limit and adjustment after trend absolute value differenceChoose t0Moment transmission cross-section SiMiddle peace
The maximum value of the difference of trend absolute value after full limit value and adjustmentIt enables at this timeIt is corresponding
Interconnection isDetermined as follows:
IfThen indicate interconnectionIt has the ability to eliminate interconnectionOut-of-limit trend, further determine
It is as follows: ifAdjustmentIfAdjustmentSubsequently into step 3-3-2)；
IfThen indicate interconnectionThere is no enough abilities to eliminate interconnectionOut-of-limit trend, into one
Step determines as follows: ifAdjustmentIfAdjustment Subsequently into step 3-3-1-2)；
3-3-1-2) define t0Moment current transmission cross-section SiMiddle interconnectionThe out-of-limit trend of residueIt carries out such as
Lower judgement:
IfIt enablesIf
It enablesThen according to current transmission cross-section SiMiddle contact
LineTrend value adjusted calculates t0The difference of trend absolute value after the safety limit of moment each interconnection and adjustmentChoosing
Take t0Moment transmission cross-section SiThe maximum value of the difference of trend absolute value is after middle safety limit and adjustmentIt enables at this timeCorresponding to interconnection isDetermined as follows:
IfThen indicate interconnectionIt has the ability to eliminate interconnectionThe out-of-limit trend of residue, further
Determine: ifAdjustmentIfAdjustmentSubsequently into step 3-3-2)；
IfThen indicate interconnectionIt has no ability to eliminate interconnectionThe out-of-limit trend of residue, adjustmentAnd repeat step 3-3-1-2), continue to distribute, until interconnectionIt has the ability to eliminate interconnection
The out-of-limit trend of residue, and enter step 3-3-2)；
If trend section SiIn all interconnections reach trend safety limit, it is out-of-limit still to eliminate trend, shows to walk
It is rapid 2) in give the total load flow rectification amount Δ P of transmission cross-sectioniIt is unreasonable, it can not effectively be distributed, then to user's outputting alarm
Information " input cross section regulation is unreasonable, please re-enter ", and return step 2) redefine total load flow rectification amount Δ Pi；
3-3-2) constantly repeat step 3-3-1), it goes through all over all transmission cross-sections, completion interconnection trend adjustment verification, and
Trend value after all interconnection adjustment in all transmission cross-sections；
3-4) using trend value after interconnection adjustment each in the finally obtained all transmission cross-sections of step 3-3), t is updated0When
It carves in power grid historical data and corresponds to interconnection trend value, by Load flow calculation, obtain the active of each branch in regional power grid model
Power and reactive power, to obtain active loss after moment power grid adjustmentWith equipment active lossidev∈
(1,Ndev),idevFor device numbering, NdevFor equipment sum in power grid；
4) it is successively read integral point moment t when 24 of typical day 00hHistorical data, and according to step 3) calculate to it is corresponding when
Carve the loss of history electric network activeEquipment active lossIt is lost with electric network active after adjustmentEquipment active loss
5) adjustment forefoot area grid net loss electricity is calculated:
Calculate equipment Energy loss before adjusting:
Calculate adjustment rear region grid net loss electricity:
Calculate equipment Energy loss after adjusting:
The characteristics of the method for the present invention and beneficial effect are:
The present invention is based on interconnected networks to focus on this characteristic of safe and stable operation, has investigated determining generated energy, connection emphatically
When winding thread framework, regional power grid network loss caused by by electricity is sent to the interconnection of regional power grid and external electrical network；Specifically, of the invention
It is realized to interconnection not by power grid historical data by the larger interconnection trend for changing one's respective area power grid and external electrical network
With the line losses management of regional power grid under trend mode.
1) present invention has according to setting trend cross section regulation amount and interconnection trend safety limit, calculates and adjusts automatically
The function of interconnection trend can provide corresponding regional power grid Energy loss to different power transmission modes；
2) present invention can provide the network loss situation of all devices in the power grid of adjustment front and back, especially the network loss number of route
According to helping to analyze under interconnection difference power transmission mode, pass through trend and its variation and the distribution of caused network loss and become in power grid
Change situation, damage equipment, power grid wastage reducing and energy saving provide foundation again to determine.
Specific embodiment
Technical solution of the present invention is further described below with reference to embodiment:
The present embodiment regional power grid A net to be calculated and 3 external electrical networks interconnect, corresponding transmission cross-section and interconnection information
It is as shown in table 1:
Table 1
A kind of regional power grid line losses management method of the consideration interconnection trend adjustment of the present embodiment, comprising the following steps:
1) model of regional power grid A to be calculated is obtained and loaded from Energy Management System (EMS), which includes region electricity
Net the topological structure of A, the electric parameter of regional power grid A primary equipment, regional power grid A and interconnection parameter of external electrical network etc.；
According to the topological relation of regional power grid A, respectively obtains regional power grid A and each external electrical network interconnects information, i.e. regional power grid A difference
Pass through transmission cross-section S1、S2、S3With external electrical network A1、A2、A3Realize interconnection, wherein transmission cross-section S1Including 2 interconnections, transmission of electricity
Section S2Including 3 interconnections, transmission cross-section S3Including 2 interconnections；
2) note interconnection trend adjustment forefoot area power grid A and external electrical network AiThe total trend of transmission cross-section be Pi his, To adjust preceding transmission cross-section SiIn j-th of interconnection trend value, it is specified that transmission cross-section S before adjustingiIt is interior
The direction of tide of each interconnection is consistent；Note adjustment rear region power grid A and external electrical network AiThe total trend of transmission cross-section be Pi, For transmission cross-section S after adjustmentiIn j-th of interconnection trend value, it is specified that adjustment after transmission cross-section SiIt is interior each
The direction of tide of interconnection is consistent；Remember regional power grid A and external electrical network AiThe total load flow rectification amount of transmission cross-section be Δ Pi, For transmission cross-section SiIn j-th of interconnection load flow rectification amount；Each transmission cross-section is always damp before note adjusts
Current algebra and it isEach total trend algebraical sum of transmission cross-section is after note adjustmentAnd Phis=P,
Read typical day t0The power grid historical data at moment, the historical data include the active power and nothing of power generator
Function power, the active power of transformer and reactive power, the active power of route and reactive power, busbar voltage, duty value
Active power and reactive power, grid circuit breaker and isolation switch the information such as division state, it is known that each transmission cross-section Si
Total trend (adjust before total trend), determine therefrom that total load flow rectification amount Δ Pi, which can be to meet power grid reality
The arbitrary value (such as can total trend be that base value is adjusted by setting ratio) of situation, and meet Phis=P,This
Each defeated section S of embodiment settingiTotal load flow rectification amount Δ PiIt is as shown in table 2:
Table 2
| Transmission cross-section | Section tidal current before adjusting | Section tidal current adjustment amount | Section tidal current after adjustment |
| S1 | 150MW | 50MW | 200MW |
| S2 | 200MW | 100MW | 300MW |
| S3 | -180MW | -150MW | -330MW |
3) typical day t is calculated0The loss of moment history electric network activeIt is lost with electric network active after adjustmentSpecific mistake
Journey is as follows:
3-1) according to the t of reading0Moment power grid historical data obtains in regional power grid model each by Load flow calculation
The active power and reactive power on road, to obtain moment electric network active lossWith equipment active lossidev
∈(1,Ndev),idevFor device numbering, NdevFor equipment sum in power grid；Wherein, the present embodiment is to t0The loss of moment electric network activeWith equipment active lossCalculating process is specific as follows:
Load flow calculation equation under polar coordinates are as follows:
In formula: NB is all node sets in the power grid, and S is reference mode,WithThe respectively described NB internal segment
The active and reactive power generation output power of point i',WithThe burden with power of the respectively described NB interior nodes i' and idle negative
Lotus, Vi'And Vj'For the voltage magnitude of NB the interior nodes i' and j', set I' indicate it is all with node i ' the section that there is branch to connect
Point set, Gi'j'、Bi'j'Conductance, susceptance between the NB interior nodes i' and node j', θi'j'=θi'-θj'For node i ' with
Phase angle difference between node j'；θSFor the phase angle of reference mode S.In Load flow calculation, it is known thatAnd
Gi'j'、Bi'j', whereinFor the operating status of power grid, Gi'j'、Bi'j'For the parameter of branch, this tittle
It is all from the moment historical data, the unknown quantity of solution is Vi'And θi'.Shared NB mode equation number and NB unknown number lead to
The V of all nodes can be obtained in the hope of determining solution by crossing numerical computation methodi'And θi'Afterwards, pass through Branch Power Flow calculation formula:
The effective power flow P of each branch can be calculatedi'j', it is calculate by the following formula to obtain moment t0Equipment idevActive tide
Stream loss
Wherein Pi”j”And Pj”i”For equipment i in power transmission networkdevBranch the i-th " node in place is to jth " branch (i ", j ") of node
The active power at both ends, and the active power loss for equipment place branch.
It is calculate by the following formula to obtain moment t0The effective power flow of power grid is lost
Wherein NL is the set of all branches for generating active loss in power transmission network, Pi'j'And Pj'i'It is in power transmission network i-th '
Active power of the node to both ends branch (i', j') of jth ' node, and the active power loss for the branch.
3-2) set t0Moment transmission cross-section SiThe load flow rectification amount of middle j-th strip interconnection isExpression formula is as follows:
In formula,For t0Moment transmission cross-section SiTotal adjustment amount accounts for transmission cross-section SiThe percentage of total trend,ΔPiThe regional power grid A and external electrical network A determined for step 2)iTransmission cross-section SiTotal trend tune
Whole amount,To adjust preceding t0Moment transmission cross-section SiTotal trend, according to step 2) read t0Moment power grid historical data, will
Transmission cross-section SiInterior interconnection trend sums to obtain；To adjust preceding t0Moment transmission cross-section SiMiddle j-th strip interconnection trend；
T0 moment transmission cross-section S after setting adjustmentiThe trend of middle j-th strip interconnection
The present embodiment obtains Section Tidal Current of Power Transmission adjustment amount according to step 2) and calculates each interconnection adjustment amount, as shown in table 3,
Trend unit is MW:
Table 3
Interconnection trend adjustment amount 3-3) is verified, trend value, packet after the adjustment of all interconnections are obtained in all transmission cross-sections
Include following steps:
The absolute value of effective power flow on every route of power grid has a safety limit, remembers interconnection effective power flow safety limit
pmax, remember the difference p' of trend absolute value after the safety limit and adjustment, then transmission cross-section SiMiddle interconnectionEffective power flow safety
Limit value is denoted asTransmission cross-section SiMiddle interconnectionSafety limit and adjustment after the difference of trend absolute value be denoted as
3-3-1) to i-th current of transmission cross-section SiDetermined as follows: ifIndicate that the interconnection adjusts
Trend is not out-of-limit afterwards, then enters step 3-3-2)；IfTrend is out-of-limit after indicating interconnection adjustment, and needing will be out-of-limit
Other not out-of-limit interconnections are partially distributed to, specific assigning process is as follows:
3-3-1-1) current transmission cross-section S is calculated according to formula (2)iMiddle interconnectionAdjustment after trend value, in terms of this
Calculate t0Moment interconnectionSafety limit and adjustment after trend absolute value differenceChoose t0Moment transmission cross-section SiMiddle peace
The maximum value of the difference of trend absolute value after full limit value and adjustmentIt enables at this timeIt is corresponding
Interconnection isDetermined as follows:
IfThen indicate interconnectionIt has the ability to eliminate interconnectionOut-of-limit trend, further determine
It is as follows: ifAdjustmentIfAdjustmentSubsequently into step 3-3-2)；
IfThen indicate interconnectionThere is no enough abilities to eliminate interconnectionOut-of-limit trend, into one
Step determines as follows: ifAdjustment(when there is no regulating power, first by t0 moment interconnectionTide
Flow valuve is adjusted to its safety limit),IfAdjustment,Subsequently into step
3-3-1-2)；
3-3-1-2) define t0Moment current transmission cross-section SiMiddle interconnectionThe out-of-limit trend of residueIt carries out as follows
Determine:
IfIt enablesIf
It enablesThen according to current transmission cross-section SiMiddle contact
LineTrend value adjusted calculates t0The difference of trend absolute value after the safety limit of moment each interconnection and adjustmentChoosing
Take t0Moment transmission cross-section SiThe difference maximum value of trend absolute value after middle safety limit and adjustmentIt enables at this timeCorresponding to interconnection isDetermined as follows:
IfThen indicate interconnectionIt has the ability to eliminate interconnectionThe out-of-limit trend of residue, further
Determine: ifAdjustmentIfAdjustmentSubsequently into step 3-3-2)；
IfThen indicate interconnectionIt has no ability to eliminate interconnectionThe out-of-limit trend of residue, adjustmentAnd repeat step 3-3-1-2), continue to distribute, until interconnectionIt has the ability to eliminate interconnection
The out-of-limit trend of residue, and enter step 3-3-2)；
If trend section SiIn all interconnections reach trend safety limit, it is out-of-limit still to eliminate trend, shows to walk
It is rapid 2) in give the total load flow rectification amount Δ P of transmission cross-sectioniIt is unreasonable, it can not effectively be distributed, then to user's outputting alarm
Information " input cross section regulation is unreasonable, please re-enter ", and return step 2) redefine total load flow rectification amount Δ Pi；
3-3-2) constantly repeat step 3-3-1), it goes through all over all transmission cross-sections, completion interconnection trend adjustment verification, and
Trend value after all interconnection adjustment in all transmission cross-sections；
3-4) using trend value after interconnection adjustment each in the finally obtained all transmission cross-sections of step 3-3), t is updated0When
It carves in power grid historical data and corresponds to interconnection trend value, by Load flow calculation, obtain the active of each branch in regional power grid model
Power and reactive power, to obtain active loss after moment power grid adjustmentWith equipment active lossidev∈
(1,Ndev),idevFor device numbering, NdevFor equipment sum in power grid；
For the present embodiment, interconnection data in each transmission cross-section can be calculated according to data with existing, such as 4 institute of table
Show, unit MW:
Table 4
For transmission cross-section S1, haveThat is interconnectionTrend is not out-of-limit after adjustment,
Enter step 3-3-2)；
For transmission cross-section S3, haveThat is interconnectionTrend is not got over after adjustment
Limit, enters step 3-3-2)；
For transmission cross-section S2, haveThat is interconnectionTrend is not got over after adjustment
Limit, enters step 3-3-2)；That is interconnectionTrend is out-of-limit after adjustment, needs to be partially distributed to other for out-of-limit
Not out-of-limit interconnection, specific assigning process is as shown in table 5, unit MW:
Table 5
The difference maximum value of trend absolute value after safety limit and adjustment
That is interconnectionIt has the ability to eliminate interconnectionOut-of-limit trend, adjustment And enter step 3-3-2)；
4) it is successively read integral point moment t when 24 of typical day 00hHistorical data, and according to step 3) calculate to it is corresponding when
Carve the loss of history electric network activeEquipment active lossIt is lost with electric network active after adjustmentEquipment active loss
5) adjustment forefoot area grid net loss electricity is calculated:
Calculate equipment Energy loss before adjusting:
Calculate adjustment rear region grid net loss electricity:
Calculate equipment Energy loss after adjusting:
It is finally obtained according to the present invention as a result, if Ehisloss> Eloss, show that history area grid net loss is greater than trend side
Grid net loss after formula changes, trend mode, which changes, can reduce loss, if Ehisloss< Eloss, show history area grid net loss
Grid net loss after changing less than trend mode, trend mode, which changes, will increase loss；Provide the present embodiment equipment loss comparison number
According to as shown in table 6, unit MWh:
Table 6
| Device name | History loss | It is lost after adjustment |
| Route A | 7.26 | 6.99 |
| Route B | 6.51 | 3.86 |
| Route C | 15.65 | 15.76 |
Above-mentioned calculated result can be saved with document form, facilitate carry out subsequent analysis.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (1)
1. a kind of regional power grid line losses management method for considering interconnection trend adjustment, which comprises the following steps:
1) model that regional power grid A to be calculated is obtained and loaded from Energy Management System, according to the topological relation of regional power grid A,
Respectively obtain regional power grid A to be calculated and each external electrical network AiTransmission cross-section Si, remember i-th of transmission cross-section SiThe contact for including
Line is respectivelyWherein (1, N) i ∈,i、N、j、NSiIt is positive integer, respectively indicates outside
The number of power grid, the total number of external electrical network, regional power grid A and i-th of external electrical network transmission cross-section SiThe volume of middle interconnection
Number and i-th of external electrical network transmission cross-section SiContained interconnection sum；
2) note interconnection trend adjustment forefoot area power grid A and external electrical network AiThe total trend of transmission cross-section be Pi his, To adjust preceding transmission cross-section SiIn j-th of interconnection trend value, it is specified that transmission cross-section S before adjustingiIt is interior
The direction of tide of each interconnection is consistent；Note adjustment rear region power grid A and external electrical network AiThe total trend of transmission cross-section be Pi, For transmission cross-section S after adjustmentiIn j-th of interconnection trend value, it is specified that adjustment after transmission cross-section SiIt is interior each
The direction of tide of interconnection is consistent；Remember regional power grid A and external electrical network AiThe total load flow rectification amount of transmission cross-section be Δ Pi, For transmission cross-section SiIn j-th of interconnection load flow rectification amount；Each transmission cross-section is always damp before note adjusts
Current algebra and it isEach total trend algebraical sum of transmission cross-section is after note adjustmentAnd Phis=P,
Read typical day t0The power grid historical data at moment obtains each transmission cross-section SiTotal trend, determine therefrom that total trend tune
Whole amount Δ Pi, which can be the arbitrary value for meeting power grid actual conditions, and meet
3) typical day t is calculated0The loss of moment history electric network activeIt is lost with electric network active after adjustmentDetailed process is such as
Under:
3-1) according to the t of reading0Moment power grid historical data, by Load flow calculation, obtain each branch in regional power grid model has
Function power and reactive power, to obtain moment electric network active lossWith equipment active lossidev∈(1,
Ndev),idevFor device numbering, NdevFor equipment sum in power grid；
3-2) set t0Moment transmission cross-section SiThe load flow rectification amount of middle j-th strip interconnection isExpression formula is as follows:
In formula,For t0Moment transmission cross-section SiTotal adjustment amount accounts for transmission cross-section SiThe percentage of total trend,ΔPiThe regional power grid A and external electrical network A determined for step 2)iTransmission cross-section SiTotal trend tune
Whole amount,To adjust preceding t0Moment transmission cross-section SiTotal trend, according to step 2) read t0Moment power grid historical data, will
Transmission cross-section SiInterior interconnection trend sums to obtain；To adjust preceding t0Moment transmission cross-section SiMiddle j-th strip interconnection trend；
T after setting adjustment0Moment transmission cross-section SiThe trend of middle j-th strip interconnectionExpression formula is as follows:
Interconnection trend adjustment amount 3-3) is verified, obtains in all transmission cross-sections trend value after the adjustment of all interconnections, including with
Lower step:
Remember interconnection effective power flow safety limit pmax, remember the difference p' of trend absolute value after the safety limit and adjustment, then transmission of electricity is disconnected
Face SiMiddle interconnectionEffective power flow safety limit be denoted asTransmission cross-section SiMiddle interconnectionSafety limit and adjustment
The difference of trend absolute value is denoted as afterwards
3-3-1) to i-th current of transmission cross-section SiDetermined as follows: ifIndicate damp after the interconnection adjusts
Stream is not out-of-limit, then enters step 3-3-2)；IfTrend is out-of-limit after indicating interconnection adjustment, needs out-of-limit portion
Other not out-of-limit interconnections are assigned to, specific assigning process is as follows:
3-3-1-1) current transmission cross-section S is calculated according to formula (2)iMiddle interconnectionAdjustment after trend value, t is calculated with this0When
Carve interconnectionSafety limit and adjustment after trend absolute value differenceChoose t0Moment transmission cross-section SiMiddle safety limit
And the maximum value of the difference of trend absolute value after adjustmentIt enables at this timeCorresponding interconnection
ForDetermined as follows:
IfThen indicate interconnectionIt has the ability to eliminate interconnectionOut-of-limit trend, further determine as
Under: ifAdjustmentIfAdjustmentSubsequently into step 3-3-2)；
IfThen indicate interconnectionThere is no enough abilities to eliminate interconnectionOut-of-limit trend, further sentence
It is fixed as follows: ifAdjustmentIfAdjustment Subsequently into step 3-3-1-2)；
3-3-1-2) define t0Moment current transmission cross-section SiMiddle interconnectionThe out-of-limit trend of residueSentenced as follows
It is fixed:
IfIt enablesIfIt enablesThen according to current transmission cross-section SiMiddle interconnectionTrend value adjusted calculates t0The difference of trend absolute value after the safety limit of moment each interconnection and adjustmentIt chooses
t0Moment transmission cross-section SiThe maximum value of the difference of trend absolute value is after middle safety limit and adjustmentIt enables at this timeCorresponding to interconnection isDetermined as follows:
IfThen indicate interconnectionIt has the ability to eliminate interconnectionThe out-of-limit trend of residue, further sentence
It is fixed: ifAdjustmentIfAdjustmentSubsequently into step 3-3-2)；
IfThen indicate interconnectionIt has no ability to eliminate interconnectionThe out-of-limit trend of residue, adjustmentAnd repeat step 3-3-1-2), continue to distribute, until interconnectionIt has the ability to eliminate interconnectionThe out-of-limit trend of residue, and enter step 3-3-2)；
If trend section SiIn all interconnections reach trend safety limit, it is out-of-limit still to eliminate trend, shows in step 2)
The total load flow rectification amount Δ P of given transmission cross-sectioniIt is unreasonable, can not effectively be distributed, then return step 2) redefine always
Load flow rectification amount Δ Pi；
3-3-2) constantly repeat step 3-3-1), it goes through all over all transmission cross-sections, completes interconnection trend adjustment verification, and obtain institute
There is in transmission cross-section trend value after the adjustment of all interconnections；
3-4) using trend value after interconnection adjustment each in the finally obtained all transmission cross-sections of step 3-3), t is updated0Moment electricity
Interconnection trend value is corresponded in net historical data, by Load flow calculation, obtains the active power of each branch in regional power grid model
And reactive power, to obtain active loss after moment power grid adjustmentWith equipment active lossidev∈(1,
Ndev),idevFor device numbering, NdevFor equipment sum in power grid；
4) it is successively read integral point moment t when 24 of typical day 00hHistorical data, and calculate the corresponding moment according to step 3) and go through
The loss of history electric network activeEquipment active lossIt is lost with electric network active after adjustmentEquipment active loss
5) adjustment forefoot area grid net loss electricity is calculated:
Calculate equipment Energy loss before adjusting:
Calculate adjustment rear region grid net loss electricity:
Calculate equipment Energy loss after adjusting:
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