CN109102196A - A kind of power distribution network diversification load digestion capability appraisal procedure and system - Google Patents
A kind of power distribution network diversification load digestion capability appraisal procedure and system Download PDFInfo
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- CN109102196A CN109102196A CN201810958918.5A CN201810958918A CN109102196A CN 109102196 A CN109102196 A CN 109102196A CN 201810958918 A CN201810958918 A CN 201810958918A CN 109102196 A CN109102196 A CN 109102196A
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
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- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
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- G—PHYSICS
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0637—Strategic management or analysis, e.g. setting a goal or target of an organisation; Planning actions based on goals; Analysis or evaluation of effectiveness of goals
- G06Q10/06375—Prediction of business process outcome or impact based on a proposed change
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S50/00—Market activities related to the operation of systems integrating technologies related to power network operation or related to communication or information technologies
- Y04S50/16—Energy services, e.g. dispersed generation or demand or load or energy savings aggregation
Abstract
The present invention relates to a kind of power distribution network diversification load digestion capability appraisal procedure and systems, comprising the following steps: 1) obtains regional power grid basic data, and draft diversification load and be initially accessed scheme；2) layering subelement is carried out to regional power grid to divide；3) Rationality Assessment index system is established, for carrying out Rationality Assessment to layering subelement power grid；4) the layering subelement division result based on regional power grid builds computation model and obtains regional power grid operation data, and according to Rationality Assessment index system and grid operation data, calculates the reasonability score value of diversification load access rear region power grid；5) judge whether current diversification load access scheme is maximum digestion capability scheme, if so, stopping calculating, regional power grid is otherwise obtained to the maximum digestion capability of diversification load by loop iteration.The present invention can be widely applied to the evaluation of power distribution network diversification load connect-in strategy and preferred work.
Description
Technical field
The present invention relates to power distribution network diversification load planning technology fields, and in particular to a kind of matching based on layering subelement
Power distribution network diversification load digestion capability appraisal procedure and system.
Background technique
In recent years, with the continuous social and economic development, diversity and complexity are increasingly presented in the load in power distribution network
Feature, and demand of the different type load to Power System Reliability and power supply quality is different.It is electric car, energy-storage system, micro-
The polynary load such as net system, in energy-saving and emission-reduction, load management, renewable resource utilization, power quality improves, system reliability mentions
High aspect embodies bigger value, makes up the deficiency of conventional electrical distribution net.But since the polynary load of scale accesses distribution
Net, the characteristic of randomness, access technology otherness and " being both power supply and load " run and plan to power distribution network and generate
It significantly affects.Therefore, scientifically and rationally assessment power distribution network dissolves the ability of polynary load, it has also become distribution network planning and ran
Critical issue in journey.
Currently, distribution network planning can not grasp the overall situation of regional diversification load, it is more to lack assessment power distribution network consumption
The maturation method and tool of memberization load cause the access of diversification load confused and disordered, cause to power network safety operation
Impact.Meanwhile lacking diversification load Rationality Assessment method, it is difficult to which its applicable cases is fed back in tracking.To promote diversification negative
Distribution network planning is instructed in the coordinated development of lotus and power distribution network, improves power distribution network to the digestion capability of diversification load, needs more
Memberization load digestion capability calculates aspect and is probed into, for diversification load it is scientific, orderly grid-connected provide support.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of power distribution network diversification load digestion capability appraisal procedure and
System, in conjunction with the Rationality Assessment of diversification load, emphasis from operation of power networks it is safe and reliable in terms of assessment area power grid and its
Internal each element provides reason to the digestion capability of diversification load for the evaluation of diversification load access scheme and District power network planning
By and technical support.
To achieve the above object, the present invention takes following technical scheme: a kind of power distribution network diversification load digestion capability is commented
Estimate method, it is characterised in that the following steps are included: 1) obtaining model, parameter and the fortune of the regional power grid of diversification load to be accessed
The basic datas such as row data, and draft diversification load and be initially accessed scheme；2) it obtains in diversification load initial access scheme
The on-position of diversification load and access scale, and regional power grid is layered according to the access scale of the diversification load
Subelement divides；Wherein, the access scale of diversification load includes access capacity and access voltage class；3) negative according to diversification
The situation of change of lotus access front and back regional power grid operating status establishes Rationality Assessment index system, and determines each evaluation index
Index weights are used to carry out Rationality Assessment to layering subelement power grid；Wherein, peace when operation of power networks state refers to operation of power networks
Row for the national games, power quality, energy management；4) it is based on the layering subelement division result in step 2) to regional power grid, according to step
Rapid 3) the middle Rationality Assessment index system established, builds power system computation model, calculates diversification load and access rear region
The every evaluation index situation of change and score of power grid obtain the reasonability score value of diversification load access rear region power grid；
5) according to the reasonability score value of obtained regional power grid, judge whether current diversification load access scheme is maximum consumption energy
Otherwise power scheme obtains regional power grid to the maximum consumption energy of diversification load by loop iteration if so, stopping calculating
Power.
In the step 2), the method that layering subelement divides is carried out to regional power grid are as follows: first, in accordance with voltage class
Regional power grid is carried out layering division by difference, is then assigned according to main element type in each voltage class with importance difference
Power, obtains the layering subelement division result of regional power grid.
In the step 3), the reasonability of the situation of change foundation of front and back operation of power networks state is accessed according to diversification load
Evaluation index includes safe operation index, power quality index and energy management index；The safe operation index envelope curve road or
Transformer is unsatisfactory for N-1 index, route or transformer heavy duty increment rate index, short-term load (duty) rate value added index and short circuit current
Exceeding standard rate index；The power quality index includes voltage deviation exceeding standard rate index, harmonic voltage exceeding standard rate index and harmonic wave electricity
Flow exceeding standard rate index；The energy management index includes peak-valley ratio value added index and line loss value added index.
The calculation formula of the items evaluation index is as follows:
1. being safely operated index
A, it is unsatisfactory for N-1 increment rate:
In formula,The transformer or number of, lines increment rate of N-1 safety criterion are unsatisfactory for after accessing for diversification load,
Unit is %；nTAiFor the transformer or number of, lines for being unsatisfactory for N-1 safety criterion after the access of diversification load；nTBiFor diversification
The transformer or number of, lines of N-1 safety criterion are unsatisfactory for before load access；nTFor assessment area power distribution network common transformer or
Number of, lines；
B, equipment component heavy duty increment rate:
In formula:For transformer or number of, lines increment rate heavily loaded after the access of diversification load, unit %；nTSAi
Heavily loaded transformer or number of, lines after the access of diversification load；nTSBiThe transformer or line of heavy duty before being accessed for diversification load
Number amount: nTSFor transformer in assessment area power distribution network or route sum；
C, short-term load (duty) rate value added:
In formula, x5For the short-term load (duty) rate value added after the access of diversification load, unit %；It is connect for diversification load
After entering, the average load of the period, unit is megawatt；PAL.maxAfter the access of diversification load, peak load in the period, unit
For megawatt；Before the access of diversification load, the average load of the period, unit is megawatt；PBL.maxFor the access of diversification load
Before, peak load in the period, unit is megawatt；
D, short-time current exceeding standard rate:
In formula: x6For the exceeded number of nodes increment rate of short circuit current after the access of diversification load, unit %；NSCDGIt is more
Desired node number is unsatisfactory for after the access of memberization load；NSCTo be unsatisfactory for desired node number before the access of diversification load；
nNOD,IFor assessment area power distribution network calculation of short-circuit current number of nodes；
2. power quality index
A, voltage unusual fluctuation exceeding standard rate:
In formula:Not for voltage deviation exceeding standard rate, voltage fluctuation and flicker exceeding standard rate, voltage after the access of diversification load
Degree of balance exceeding standard rate, unit %；nTCAiNot for voltage deviation, voltage fluctuation and flicker or voltage after the access of diversification load
The degree of balance is unable to satisfy the number of nodes of requirement；nTCBiVoltage deviation, voltage fluctuation and flicker before being accessed for diversification load, or
Voltage unbalance factor is unable to satisfy the number of nodes of requirement；nTCAssessment area node total number；
B, harmonic wave unusual fluctuation exceeding standard rate:
In formula, KUFor harmonic voltage exceeding standard rate or harmonic current exceeding standard rate after the access of diversification load, unit %；nVdAi
Desired number of nodes is unsatisfactory for for harmonic voltage after the access of diversification load or harmonic current；nVdBiFor the access of diversification load
Preceding harmonic voltage or harmonic current are unsatisfactory for desired number of nodes；nNODFor assessment area power distribution network number of nodes；
3. energy management index
A, peak-valley ratio value added:
In formula: x12For peak-valley ratio value added after the access of diversification load, unit %；PPVDAFor the access of diversification load
Assessment area peak-valley difference afterwards, unit are megawatt；PPVDAMFor assessment area load maximum value after the access of diversification load, unit million
Watt；PPVDBAssessment area peak-valley difference before accessing for diversification load, unit are megawatt；PPVDBMAssessment before being accessed for diversification load
Region load maximum value, unit are megawatt.
B, line loss value added:
x13=LA-LB,
In formula: x13For line loss per unit value added after the access of diversification load, unit %；LAFor line after the access of diversification load
Loss rate；LBLine loss per unit before being accessed for diversification load.
In the step 3), the index weights of every evaluation index are according to each partition power grid and the different degree feelings of evaluation index
Condition determines, and the sum of all evaluation criterion weights are 1；The establishment principle of the scoring formula of every evaluation index is: diversification is negative
After lotus access, if the corresponding exceeded situation of evaluation index increases, scoring is negative；If the corresponding exceeded situation of evaluation index subtracts
Few, then scoring is positive.
In the step 4), the appraisal procedure of the reasonability score value of regional power grid the following steps are included:
4.1) according to the every evaluation index score and index weights of each element of different voltages level Grid, electricity is calculated
The reasonability score value of mesh element；
Wherein, the calculation formula of the element reasonability score value of each level Grid are as follows:
In formula: M is that different voltages grade power distribution network dissolves reasonability scoring；yiFor the kth item specific targets number of power distribution network
Value；wiFor the kth item specific targets weight of power distribution network；
4.2) by different voltages level Grid reasonability score value weighted accumulation, the reasonability of each voltage class power grid is obtained
Score value, calculation formula are as follows:
In formula: MiFor the reasonability score value of the voltage class electric network element of serial number i；Wi jFor voltage class serial number i,
It is layered serial number AjPartition power grid reasonability score weight；
4.3) by the reasonability score value weighted accumulation of each voltage class power grid, the reasonability scoring of regional power grid is obtained
Value；Calculation formula are as follows:
In formula: MAREAThe reasonability scoring of rear region power grid is accessed for diversification load；N is the difference of regional power grid evaluation
Voltage class quantity, n≤5；WiFor the reasonability index weights of the voltage class power grid of voltage class serial number i.
In the step 5), according to the reasonability score value of obtained regional power grid, it is more to judge whether regional power grid has
The method of memberization load digestion capability are as follows:
If reasonability score value is greater than 0, evaluation result is " having stronger digestion capability "；
If reasonability score value is equal to 0 point, evaluation result is " having digestion capability "；
If reasonability score value be 0 point hereinafter, if evaluation result be " not having digestion capability ".
In the step 5), the maximum digestion capability refers to that regional power grid dissolves under the conditions of meeting safe and reliable operation
Diversification load maximum capacity, i.e., when regional power grid reasonability score value be 0 when, corresponding diversification load access capacity.
In the step 5), regional power grid is obtained to the method for the maximum digestion capability of diversification load by loop iteration
The following steps are included:
5.1) whether judge that current reasonability scoring calculates is first iteration: if first iteration, then judgement obtains
Whether the reasonability score value of current region power grid is 0, if 0, then corresponding diversification in the diversification load access scheme
Load access capacity is the maximum digestion capability of the regional power grid；If not 0, then it enters step 5.3)；
5.2) if not first iteration, then judge the reasonability score value and current region power grid of last regional power grid
Whether reasonability score value is respectively one positive one negative；
If the determination result is YES, i.e., the reasonability score value of last regional power grid and the reasonability of current region power grid are commented
Score value is respectively one positive one negative, then corresponding polynary when linear interpolation method being used to seek regional power grid reasonability score value as 0
Change load access capacity, which is the maximum digestion capability of regional power grid；
If judging result be it is no, enter step 5.3)；
5.3) judge whether the reasonability score value of current region power grid is greater than 0:
If the determination result is YES, i.e., the reasonability score value of current region power grid is greater than 0, shows that regional power grid has enough
Adjustment ratio S is arranged in digestion capabilitykFor positive value, according to adjustment ratio SkTo increase diversification load access capacity Fk+1=Fk×
(1+Sk) after, return step 4) it is iterated again；
If judging result be it is no, i.e., 5.4) the reasonability score value of current region power grid is then entered step less than 0；
5.4) in the case where the access capacity of diversification load is constant, judge that diversification load access scheme whether can
It is adjusted again；
Specific judgment method are as follows: in the case where the access capacity of diversification load is constant, according to Rationality Assessment knot
Fruit adjusts and improves diversification load planning access scheme for the insufficient weak link of reasonability, later return step 4) again
Carry out Rationality Assessment；If adjustment rear region power grid does not still have consumption condition to diversification load access scheme, that is, close
Rationality score value then illustrates that the diversification load access scheme cannot be adjusted again still less than 0；
If the diversification load access scheme cannot be adjusted again, adjustment ratio S is setkFor negative value, according to adjustment
Ratio SkTo reduce diversification load access capacity Fk+1=Fk×(1+Sk), return step 4) it is iterated again, it finally obtains
The maximum digestion capability of regional power grid.
A kind of power distribution network diversification load digestion capability assessment system, it is characterised in that: comprising: data acquisition module,
For obtaining the basic data of the regional power grid of diversification load to be accessed, and drafts diversification load and be initially accessed scheme；Point
Layer subelement division module is obtained for being initially accessed the range of scheme and regional power grid according to the diversification load drafted
The on-position of diversification load and scale carry out layering subelement to regional power grid and divide；Evaluation index constructs module, is used for
Rationality Assessment index system is established according to the situation of change that diversification load accesses front and back regional power grid operating status；Reasonability
Score value computing module builds computation model and obtains regional power grid for the layering subelement division result according to regional power grid
Operation data, and then according to the Rationality Assessment index system of foundation, calculate the items of diversification load access rear region power grid
Evaluation index score and index weights obtain the reasonability score value of diversification load access rear region power grid；Reasonable evaluation
Module, for accessing the reasonability score value of rear region power grid according to diversification load, to current diversification load access scheme
Reasonable evaluation is carried out, and regional power grid is obtained to the maximum digestion capability of diversification load by loop iteration.
The invention adopts the above technical scheme, which has the following advantages: 1, the present invention is using the think of for being layered subelement
Want to carry out level division to power network object to be evaluated, according to the access capacity of diversification load and access voltage class to region electricity
Net carries out layering subelement and divides, and then determines the range of value of power grid, and reasonable evaluation is precisely arrived to different levels power grid
Equipment component, the accurate each equipment component of power distribution network of grasping specify digestion capability and promote bottle to the digestion capability of diversification load
Neck instructs practical construction retrofit work.2, the present invention accesses the front and back each operating status variable quantity of power grid according to diversification load
As analysis on its rationality evaluation index, reflects that diversification load accesses the influence to power distribution network, commented using the index system of quantization
Valence power grid can accurately reflect the harmony of diversification load and power distribution network to the reasonability of diversification load.3, the present invention exists
Using exploration+interpolation method method when solving diversification load maximum digestion capability, the scheme for having digestion capability is followed
Ring iterative adjusts the scheme for not having digestion capability again, the simpler easy calculation of solution procedure, has stronger operate
Property and engineering practicability.4, the present invention is according to Rationality Assessment index system to reasonable after regional power grid access diversification load
Property when being evaluated, power grid physics operating condition, the management of reduction power grid enterprises emphatically requires, so that calculated result is more in line with electricity
The safe operation of net and the requirement of power quality.Thus the present invention can be widely applied to power distribution network to the consumption of diversification load
In the calculating of ability, for diversification load science, orderly access provides support.
Specific embodiment
The present invention is described in detail below with reference to embodiment.
A kind of power distribution network diversification load digestion capability appraisal procedure provided by the invention, comprising the following steps:
1) basic datas such as model, model parameter and the operation data of regional power grid of diversification load to be accessed are obtained,
And it drafts diversification load and is initially accessed scheme；
2) according to the on-position of diversification load in diversification load initial access scheme and access scale, and according to more
The access scale of memberization load carries out layering subelement to the regional power grid of diversification load to be accessed and divides, wherein diversification
The access scale of load includes the parameters such as access capacity and access voltage class；
3) Rationality Assessment index is established according to the situation of change that diversification load accesses front and back regional power grid operating status
System, and determine index weights, for carrying out Rationality Assessment to layering subelement power grid；Wherein, operation of power networks state refers to electricity
Safe operation, power quality, energy management when net operation；
4) the layering subelement division result in step 2) to regional power grid, the Rationality Assessment established in step 3) are based on
Index system builds power system computation model, calculates every evaluation index variation of diversification load access rear region power grid
Situation and score obtain the reasonability score value of diversification load access rear region power grid；
5) according to the reasonability score value of obtained regional power grid, scheme is initially accessed to each diversification load and is commented
Estimate；
6) based on the reasonability score value of obtained regional power grid, judge that current each diversification load access scheme is
It is no that regional power grid is otherwise obtained to diversification load by loop iteration if so, stopping calculating for maximum digestion capability scheme
Maximum digestion capability.
Above-mentioned steps 2) in, according to the diversification load access scale and power grid model drafted in diversification load access scheme
It encloses, the method that layering subelement divides is carried out to regional power grid are as follows: carry out regional power grid first, in accordance with the difference of voltage class
Layering divides, and then carries out tax power with importance difference according to main element type in each voltage class, obtains regional power grid
It is layered subelement division result.
Above-mentioned steps 3) in, the conjunction of the situation of change foundation of front and back regional power grid operating status is accessed according to diversification load
Rationality assessment indicator system includes that Rationality Assessment index, Rationality Assessment index weights and the scoring of Rationality Assessment index are public
Formula.Wherein, Rationality Assessment index includes safe operation index, power quality index and energy management index.Safe operation refers to
Mark includes that route or transformer are unsatisfactory for N-1 index, route or transformation and think highly of (mistake) load increment rate index, the increase of short-term load (duty) rate
It is worth index and short circuit current exceeding standard rate index；Power quality index includes voltage deviation exceeding standard rate index, harmonic voltage exceeding standard rate
Index and harmonic current exceeding standard rate index；Energy management index includes peak-valley ratio value added index and line loss value added index.
Specifically, the calculation formula of every evaluation index is as follows:
1. being safely operated index
A, it is unsatisfactory for N-1 increment rate, i.e., after the access of diversification load, transformer and route are unsatisfactory for N-1 safety criterion
Number of elements increment rate calculates calculation formula are as follows:
In formula,The transformer or number of, lines increment rate of N-1 safety criterion are unsatisfactory for after accessing for diversification load,
That is x1Or x2, unit %；nTAiFor the transformer or number of, lines for being unsatisfactory for N-1 safety criterion after the access of diversification load；nTBi
For the transformer or number of, lines for being unsatisfactory for N-1 safety criterion before the access of diversification load；nTIt is public for assessment area power distribution network
Transformer or number of, lines；
B, equipment component weight (mistake) carries increment rate, i.e., after the access of diversification load, transformer and route number that weight (mistake) carries
Measure increment rate, calculation formula are as follows:
In formula:The transformer or number of, lines increment rate carried for weight (mistake) after the access of diversification load, i.e. x3Or x4, single
Position is %；nTSAiThe transformer or number of, lines that weight (mistake) carries after the access of diversification load；nTSBiWeight before being accessed for diversification load
The transformer or number of, lines that (mistake) carries: nTSFor transformer in assessment area power distribution network or route sum；
C, after the access of short-term load (duty) rate value added, i.e. diversification load, the ratio of average load and peak load in the short time
The value added of value, calculation formula are as follows:
In formula, x5For the short-term load (duty) rate value added after the access of diversification load, unit %；It is connect for diversification load
After entering, the average load of the period, unit is megawatt；PAL.maxAfter the access of diversification load, peak load in the period, unit
For megawatt；Before the access of diversification load, the average load of the period, unit is megawatt；PBL.maxFor the access of diversification load
Before, peak load in the period, unit is megawatt；
D, after the access of short-time current exceeding standard rate, i.e. diversification load, short circuit current is unsatisfactory for desired number of nodes and increases
Rate, the calculating of the index, which is considered as the access of diversification load, influences the method for operation of most serious on grid short circuit electric current, calculates public
Formula are as follows:
In formula: x6For the exceeded number of nodes increment rate of short circuit current after the access of diversification load, unit %；NSCDGIt is more
Desired node number is unsatisfactory for after the access of memberization load；NSCTo be unsatisfactory for desired node number before the access of diversification load；
nNOD,IFor assessment area power distribution network calculation of short-circuit current number of nodes；
2. power quality index
A, after the intervention of voltage unusual fluctuation exceeding standard rate, i.e. diversification load, voltage deviation exceeding standard rate, voltage fluctuation and flicker are exceeded
Rate, voltage unbalance factor exceeding standard rate, calculation formula are as follows:
In formula:Not for voltage deviation exceeding standard rate, voltage fluctuation and flicker exceeding standard rate, voltage after the access of diversification load
Degree of balance exceeding standard rate, i.e. x7, x8Or x9, unit %；nTCAiFor voltage deviation, voltage fluctuation and sudden strain of a muscle after the access of diversification load
Change or voltage unbalance factor are unable to satisfy the number of nodes of requirement；nTCBiVoltage deviation, voltage wave before being accessed for diversification load
Dynamic and flickering or voltage unbalance factor are unable to satisfy the number of nodes of requirement；nTCAssessment area node total number；
B, after the intervention of harmonic wave unusual fluctuation exceeding standard rate, i.e. diversification load, harmonic voltage exceeding standard rate and harmonic current exceeding standard rate, meter
Calculate formula are as follows:
In formula, KUFor harmonic voltage exceeding standard rate or harmonic current exceeding standard rate after the access of diversification load, i.e. x10Or x11, unit
For %；nVdAiDesired number of nodes is unsatisfactory for for harmonic voltage after the access of diversification load or harmonic current；nVdBiFor diversification
Harmonic voltage or harmonic current are unsatisfactory for desired number of nodes before load accesses；nNODFor assessment area power distribution network number of nodes；
3. energy management index
A, after the access of peak-valley ratio value added, i.e. diversification load, peak-valley ratio and the preceding peak valley of access in certain a period of time
The difference of rate, calculation formula are as follows:
In formula: x12For peak-valley ratio value added after the access of diversification load, unit %；PPVDAFor the access of diversification load
Assessment area peak-valley difference afterwards, unit are megawatt；PPVDAMFor assessment area load maximum value after the access of diversification load, unit million
Watt；PPVDBAssessment area peak-valley difference before accessing for diversification load, unit are megawatt；PPVDBMAssessment before being accessed for diversification load
Region load maximum value, unit are megawatt.
B, after the access of line loss value added, i.e. diversification load, line loss per unit and the difference for accessing preceding line loss per unit, calculation formula
Are as follows:
x13=LA-LB (8)
In formula: x13For line loss per unit value added after the access of diversification load, unit %；LAFor line after the access of diversification load
Loss rate；LBLine loss per unit before being accessed for diversification load.
The index weights of every evaluation index are determined according to the different degree situation of each layering power grid and evaluation index, and are owned
The sum of evaluation criterion weight is 1；The establishment principle of the scoring formula of every evaluation index is: after the access of diversification load, if commenting
The corresponding exceeded situation of valence index increases, then scoring is negative；If the corresponding exceeded situation of evaluation index is reduced, scoring is positive.
It is the index weights and scoring formula of each evaluation index shown in the following table 1.
Table 1 dissolves reasonable evaluation index and standards of grading
Above-mentioned steps 4) in, the principle of regional power grid reasonable evaluation: power grid physics operating condition emphatically, reduction power grid enterprise
Industry management requirement, i.e., regional power grid reasonable evaluation value lower limit is determined by the score value of safe operation index or power quality index
Fixed, energy management index is only used as the reasonable evaluation that aided assessment participates in regional power grid.Specifically, the reasonability of regional power grid
Assessment the following steps are included:
4.1) according to the every evaluation index score and index weights of each element of different voltages level Grid, electricity is calculated
The reasonability score value of mesh element；
Wherein, the calculation formula of the element reasonability score value of each level Grid are as follows:
In formula: M is that different voltages grade power distribution network dissolves reasonability scoring；yiFor the kth item specific targets number of power distribution network
Value；wiFor the kth item specific targets weight of power distribution network；There are close ties since energy management index and power grid enterprises manage, and
The present invention is to lay particular emphasis on objective reality reflection power grid physics operating condition, weakens enterprise operation index of correlation weight, therefore right
When the element reasonability of each level Grid is assessed, negative effect of the enterprise operation to diversification load access power grid is reduced,
Peak-valley ratio value added and line loss value added index are not considered；
4.2) by different voltages level Grid reasonability score value weighted accumulation, the reasonability of each voltage class power grid is obtained
Score value, calculation formula are as follows:
In formula: MiFor the reasonability score value of the voltage class electric network element of serial number i；Wi jFor voltage class serial number i,
It is layered serial number AjPartition power grid reasonability score weight；
4.3) by the reasonability score value weighted accumulation of each voltage class power grid, the reasonability scoring of regional power grid is obtained
Value；Calculation formula are as follows:
In formula: MAREAThe reasonability scoring of rear region power grid is accessed for diversification load；N is the difference of regional power grid evaluation
Voltage class quantity, n≤5；WiFor the reasonability index weights of the voltage class power grid of voltage class serial number i.
Above-mentioned steps 5) in, according to the reasonability score value of obtained regional power grid, judges whether regional power grid has and disappear
Receive the method for diversification load-bearing capacity are as follows:
If reasonability score value is greater than 0, evaluation result is " having stronger digestion capability "；
If reasonability score value is equal to 0 point, evaluation result is " having digestion capability "；
If reasonability score value be 0 point hereinafter, if evaluation result be " not having digestion capability ".
Above-mentioned steps 5) in, maximum digestion capability refers to what regional power grid can dissolve under the conditions of meeting safe and reliable operation
Diversification load maximum-norm amount, i.e., when regional power grid reasonability score value is 0, corresponding diversification load access capacity.
Above-mentioned steps 6) in, regional power grid is obtained to the method packet of diversification load maximum digestion capability by loop iteration
Include following steps:
6.1) whether judge that current reasonability scoring calculates is first iteration: if first iteration, then judgement obtains
Whether the reasonability score value of current region power grid is 0, if 0, then corresponding diversification in the diversification load access scheme
Load access capacity is the maximum digestion capability of the regional power grid；If not 0, then it enters step 6.3)；
6.2) if not first iteration, then judge the reasonability score value and current region power grid of last regional power grid
Whether reasonability score value is respectively one positive one negative；If the determination result is YES, i.e., the reasonability score value of last regional power grid
Reasonability score value with current region power grid is respectively one positive one negative, then it is reasonable to seek regional power grid using linear interpolation method
Property score value be 0 when, corresponding diversification load access capacity, the diversification load access capacity is the maximum of regional power grid
Digestion capability；If judging result be it is no, enter step 6.3)；
6.3) judge whether the reasonability score value of current region power grid is greater than 0: if the determination result is YES, i.e. current region
The reasonability score value of power grid is greater than 0, shows that regional power grid has enough digestion capabilities, adjustment ratio S is arrangedkFor positive value, press
According to adjustment ratio SkTo increase diversification load access capacity CAPk=CAPk×(1+Sk) after, return step 4) it changes again
Generation；If judging result be it is no, i.e., 6.4) the reasonability score value of current region power grid is then entered step less than 0；
6.4) in the case where the access capacity of diversification load is constant, judge that diversification load access scheme whether can
It is adjusted again；
Specific judgment method are as follows: in the case where the access capacity of diversification load is constant, according to Rationality Assessment knot
Fruit adjusts and improves diversification load access scheme and source side scheme for the insufficient weak link of reasonability, returns to step later
It is rapid 4) to carry out Rationality Assessment again；If adjustment rear region power grid does not still have consumption to the access scheme of diversification load
Condition, i.e. reasonability score value then illustrate that the diversification load access scheme cannot be adjusted again still less than 0；If this is polynary
Changing load access scheme cannot be adjusted again, then adjustment ratio S is arrangedkFor negative value, according to adjustment ratio SkIt is current more to reduce
The access capacity of diversification load in memberization load access scheme: CAPk=CAPk×(1+Sk), return step 4 later) again into
Row iteration finally obtains the maximum digestion capability of regional power grid.
The present invention also proposes a kind of power distribution network diversification load digestion capability assessment system comprising: data acquisition module,
For obtaining the basic data of the regional power grid of diversification load to be accessed, and drafts diversification load and be initially accessed scheme；Point
Layer subelement division module is obtained for being initially accessed the range of scheme and regional power grid according to the diversification load drafted
The on-position of diversification load and scale carry out layering subelement to regional power grid and divide；Evaluation index constructs module, is used for
Rationality Assessment index system is established according to the situation of change that diversification load accesses front and back regional power grid operating status；Reasonability
Score value computing module builds computation model and obtains regional power grid for the layering subelement division result according to regional power grid
Operation data, and then according to the Rationality Assessment index system of foundation, calculate the items of diversification load access rear region power grid
Evaluation index score and index weights obtain the reasonability score value of diversification load access rear region power grid；Reasonable evaluation
Module, for accessing the reasonability score value of rear region power grid according to diversification load, to current diversification load access scheme
Reasonable evaluation is carried out, and regional power grid is obtained to the maximum digestion capability of diversification load by loop iteration.
Finally it should be noted that: the above examples are only used to illustrate the technical scheme of the present invention rather than to its protection scope
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (10)
1. a kind of power distribution network diversification load digestion capability appraisal procedure, it is characterised in that the following steps are included:
1) basic data of the regional power grid of diversification load to be accessed is obtained, and drafts diversification load and is initially accessed scheme；
Wherein, the basic data of regional power grid includes electric network model, model parameter and operating parameter；
2) on-position of diversification load and scale in diversification load initial access scheme are obtained, and according to diversification load
Access scale, to the regional power grid of diversification load to be accessed carry out layering subelement divide；
3) situation of change that front and back regional power grid operating status is accessed according to diversification load is established for layering subelement electricity
Net carries out the Rationality Assessment index system of Rationality Assessment, and determines evaluation criterion weight；Wherein, operation of power networks state refers to electricity
Safe operation, power quality, energy management when net operation；
4) based on the on-position of diversification load, layering subelement division result, step 3) to regional power grid in step 2)
The Rationality Assessment index system of middle foundation builds power system computation model, calculates diversification load and accesses rear region power grid
The every evaluation index situation of change and score of each each element of layer, the reasonability for obtaining diversification load access rear region power grid are commented
Score value；
5) according to the reasonability score value of obtained regional power grid, scheme is initially accessed to each diversification load and is assessed.
2. a kind of power distribution network diversification load digestion capability appraisal procedure as described in claim 1, it is characterised in that the side
Method is further comprising the steps of:
6) based on the reasonability score value of obtained regional power grid, judge whether current diversification load access scheme is that maximum disappears
Receive ability scheme, if so, stop calculating, otherwise repeatedly step 1~4), regional power grid is obtained to diversification by loop iteration
The maximum digestion capability of load.
3. a kind of power distribution network diversification load digestion capability appraisal procedure as described in claim 1, it is characterised in that: the step
It is rapid 2) in, the method that layering subelement divides is carried out to regional power grid are as follows: first, in accordance with the different by regional power grid of voltage class
Layering division is carried out, then carries out tax power with importance difference according to main element type in each voltage class, obtains region electricity
The layering subelement division result of net.
4. a kind of power distribution network diversification load digestion capability appraisal procedure as described in claim 1, it is characterised in that: the step
It is rapid 3) in, according to diversification load access front and back operation of power networks state situation of change establish Rationality Assessment index include peace
Row index, power quality index and energy management index for the national games；The safe operation index envelope curve road or transformer are unsatisfactory for N-1
Index, route or transformer heavy duty increment rate index, short-term load (duty) rate value added index and short circuit current exceeding standard rate index；It is described
Power quality index includes voltage deviation exceeding standard rate index, harmonic voltage exceeding standard rate index and harmonic current exceeding standard rate index；Institute
Stating energy management index includes peak-valley ratio value added index and line loss value added index.
5. a kind of power distribution network diversification load digestion capability appraisal procedure as claimed in claim 4, it is characterised in that: described each
The calculation formula of item evaluation index is as follows:
1. being safely operated index
A, it is unsatisfactory for N-1 increment rate:
In formula,For the transformer or number of, lines increment rate for being unsatisfactory for N-1 safety criterion after the access of diversification load, i.e. x1
Or x2, unit %；nTAiFor the transformer or number of, lines for being unsatisfactory for N-1 safety criterion after the access of diversification load；nTBiFor
The transformer or number of, lines of N-1 safety criterion are unsatisfactory for before the access of diversification load；nTFor the public change of assessment area power distribution network
Depressor or number of, lines；
B, equipment component heavy duty increment rate:
In formula:For transformer or number of, lines increment rate heavily loaded after the access of diversification load, unit %；nTSAiDiversification
Heavily loaded transformer or number of, lines after load access；nTSBiThe transformer or route number of heavy duty before being accessed for diversification load
Amount: nTSFor transformer in assessment area power distribution network or route sum；
C, short-term load (duty) rate value added:
In formula, x5For the short-term load (duty) rate value added after the access of diversification load, unit %；For the access of diversification load
Afterwards, the average load of the period, unit are megawatt；PAL.maxAfter the access of diversification load, peak load in the period, unit is
Megawatt；Before the access of diversification load, the average load of the period, unit is megawatt；PBL.maxFor the access of diversification load
Before, peak load in the period, unit is megawatt；
D, short-time current exceeding standard rate:
In formula: x6The exceeded number of nodes increment rate of short circuit current after the access of diversification load, unit %；NSCDGIt is negative for diversification
Desired node number is unsatisfactory for after lotus access；NSCTo be unsatisfactory for desired node number before the access of diversification load；nNOD,IFor
Assessment area power distribution network calculation of short-circuit current number of nodes；
2. power quality index
A, voltage unusual fluctuation exceeding standard rate:
In formula:For voltage deviation exceeding standard rate, voltage fluctuation and flicker exceeding standard rate, voltage unbalance factor after the access of diversification load
Exceeding standard rate, unit %；nTCAiFor voltage deviation, voltage fluctuation and flicker or voltage unbalance factor after the access of diversification load
It is unable to satisfy the number of nodes of requirement；nTCBiPreceding voltage deviation, voltage fluctuation and flicker or voltage are accessed not for diversification load
The degree of balance is unable to satisfy the number of nodes of requirement；nTCAssessment area node total number；
B, harmonic wave unusual fluctuation exceeding standard rate:
In formula, KUFor harmonic voltage exceeding standard rate or harmonic current exceeding standard rate after the access of diversification load, unit %；nVdAiIt is more
Harmonic voltage or harmonic current are unsatisfactory for desired number of nodes after the access of memberization load；nVdBiIt is humorous before the access of diversification load
Wave voltage or harmonic current are unsatisfactory for desired number of nodes；nNODFor assessment area power distribution network number of nodes；
3. energy management index
A, peak-valley ratio value added:
In formula: x12For peak-valley ratio value added after the access of diversification load, unit %；PPVDATo be commented after the access of diversification load
Estimate region peak-valley difference, unit is megawatt；PPVDAMFor assessment area load maximum value after the access of diversification load, unit is megawatt；
PPVDBAssessment area peak-valley difference before accessing for diversification load, unit are megawatt；PPVDBMArea is assessed before accessing for diversification load
Domain load maximum value, unit are megawatt.
B, line loss value added:
x13=LA-LB,
In formula: x13For line loss per unit value added after the access of diversification load, unit %；LAFor line loss after the access of diversification load
Rate；LBLine loss per unit before being accessed for diversification load.
6. a kind of power distribution network diversification load digestion capability appraisal procedure as described in claim 1, it is characterised in that: the step
It is rapid 3) in, the index weights of every evaluation index are determined according to the different degree situation of each partition power grid and evaluation index, and all
The sum of evaluation criterion weight is 1；
The establishment principle of the scoring formula of every evaluation index is: after the access of diversification load, if evaluation index is corresponding exceeded
Situation increases, then scoring is negative；If the corresponding exceeded situation of evaluation index is reduced, scoring is positive.
7. a kind of power distribution network diversification load digestion capability appraisal procedure as described in claim 1, it is characterised in that: the step
It is rapid 4) in, the appraisal procedure of the reasonability score value of regional power grid the following steps are included:
4.1) according to the every evaluation index score and index weights of each element of different voltages level Grid, power grid member is calculated
The reasonability score value of part；
Wherein, the calculation formula of the element reasonability score value of each level Grid are as follows:
In formula: M is that different voltages grade power distribution network dissolves reasonability scoring；yiFor the kth item specific targets numerical value of power distribution network；wi
For the kth item specific targets weight of power distribution network；
4.2) by different voltages level Grid reasonability score value weighted accumulation, the reasonability scoring of each voltage class power grid is obtained
Value, calculation formula are as follows:
In formula: MiFor the reasonability score value of the voltage class electric network element of serial number i；Wi jFor voltage class serial number i, layering
Serial number AjPartition power grid reasonability score weight；
4.3) by the reasonability score value weighted accumulation of each voltage class power grid, the reasonability score value of regional power grid is obtained；Meter
Calculate formula are as follows:
In formula: MAREAThe reasonability scoring of rear region power grid is accessed for diversification load；N is the different voltages of regional power grid evaluation
Grade quantity, n≤5；WiFor the reasonability index weights of the voltage class power grid of voltage class serial number i.
8. a kind of power distribution network diversification load digestion capability appraisal procedure as described in claim 1, it is characterised in that: the step
It is rapid 5) in, according to the reasonability score value of obtained regional power grid, judge whether regional power grid has diversification load consumption energy
The method of power are as follows:
If reasonability score value is greater than 0, evaluation result is " having stronger digestion capability "；
If reasonability score value is equal to 0 point, evaluation result is " having digestion capability "；
If reasonability score value be 0 point hereinafter, if evaluation result be " not having digestion capability ".
9. a kind of power distribution network diversification load digestion capability appraisal procedure as claimed in claim 2, it is characterised in that: the step
It is rapid 6) in, regional power grid is obtained to the method for the maximum digestion capability of diversification load by loop iteration the following steps are included:
6.1) whether judge that current reasonability scoring calculates is first iteration: if first iteration, then what is judged is current
Whether the reasonability score value of regional power grid is 0, if 0, then corresponding diversification load in the diversification load access scheme
Access capacity is the maximum digestion capability of the regional power grid；If not 0, then it enters step 5.3)；
6.2) if not first iteration, then judge the reasonable of the reasonability score value of last regional power grid and current region power grid
Property score value whether be respectively one positive one negative；
If the determination result is YES, i.e., the reasonability score value of the reasonability score value of last regional power grid and current region power grid
Respectively one positive one is negative, then when linear interpolation method being used to seek regional power grid reasonability score value as 0, corresponding diversification is negative
Lotus access capacity, the diversification load access capacity are the maximum digestion capability of regional power grid；
If judging result be it is no, enter step 6.3)；
6.3) judge whether the reasonability score value of current region power grid is greater than 0:
If the determination result is YES, i.e., the reasonability score value of current region power grid is greater than 0, shows that regional power grid has enough consumptions
Adjustment ratio S is arranged in abilitykFor positive value, according to adjustment ratio SkTo increase diversification load access capacity Fk+1=Fk×(1+
Sk) after, return step 4) it is iterated again；
If judging result be it is no, i.e., 6.4) the reasonability score value of current region power grid is then entered step less than 0；
6.4) in the case where the access capacity of diversification load is constant, judge diversification load access scheme whether can again into
Row adjustment；
Specific judgment method are as follows: in the case where the access capacity of diversification load is constant, according to Rationality Assessment as a result, needle
Diversification load planning access scheme is adjusted and improved to the insufficient weak link of reasonability, later return step 4) it is closed again
Rationality evaluation；If adjustment rear region power grid does not still have consumption condition to diversification load access scheme, i.e. reasonability is commented
Score value then illustrates that the diversification load access scheme cannot be adjusted again still less than 0；
If the diversification load access scheme cannot be adjusted again, adjustment ratio S is setkFor negative value, according to adjustment ratio Sk
To reduce diversification load access capacity Fk+1=Fk×(1+Sk), return step 4) it is iterated again, finally obtain region electricity
The maximum digestion capability of net.
10. a kind of power distribution network diversification load digestion capability suitable for any one of such as claim 1~9 the method assesses system
System, it is characterised in that: comprising:
Data acquisition module, the basic data of the regional power grid for obtaining diversification load to be accessed, and it is negative to draft diversification
Lotus is initially accessed scheme；
It is layered subelement division module, for being initially accessed the model of scheme and regional power grid according to the diversification load drafted
It encloses, obtains on-position and the scale of diversification load, layering subelement is carried out to regional power grid and is divided；
Evaluation index constructs module, and the situation of change for accessing front and back regional power grid operating status according to diversification load is established
Rationality Assessment index system；
Reasonability score value computing module is built computation model and is obtained for the layering subelement division result according to regional power grid
To regional power grid operation data, and then according to the Rationality Assessment index system of foundation, calculates diversification load and access rear region
The every evaluation index score and index weights of power grid obtain the reasonability score value of diversification load access rear region power grid；
Reasonable evaluation module, for accessing the reasonability score value of rear region power grid according to diversification load, to current polynary
Change load access scheme and carry out reasonable evaluation, and regional power grid is obtained by loop iteration, the maximum of diversification load is dissolved
Ability.
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