CN110084495A - A kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing - Google Patents
A kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing Download PDFInfo
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Abstract
The present invention relates to Electric Power Network Planning assessment technique field, specially a kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing, the evaluation index including the wind farm grid-connected scheme of determination is evaluated in terms of these three from safety, economy, wind-powered electricity generation are uncertain；Overall evaluation system is established using analytic hierarchy process (AHP)；The basic data that all kinds of appraisement systems need is calculated, index is handled and is classified again；The judgment matrix of design criterions layer and indicator layer judges their consistency, solves its weight vectors, show that index weights always sort, and calculates comprehensive assessment value；Obtaining maximum comprehensive evaluation value is corresponding optimal case, the present invention is according to the existing power transmission network situation containing Large Scale Wind Farm Integration, the establishment principle of binding hierarchy analytic approach overall evaluation system, it establishes and considers probabilistic grid-connected program evaluation system of Large Scale Wind Farm Integration, influence of the wind-electricity integration to Electric Power Network Planning can be more accurately assessed, provides data foundation for Electric Power Network Planning personnel.
Description
Technical field
The present invention relates to Electric Power Network Planning assessment technique field, specially a kind of Electric Power Network Planning for considering that wind-electricity integration influences is commented
Valence method.
Background technique
The renewable energy power generations such as wind-powered electricity generation have the characteristics that intermittence, randomness, schedulability are low, right after extensive access
Operation of power networks can generate large effect.In addition, China's wind-powered electricity generation initially occurs as soon as extensive, high concentration exploitation and long distance from development
Conveying requirement from, high voltage, shows the feature dramatically different with external Wind Power Development mode, thus bring electric power network technique
It is especially prominent with economic problems, it is increasingly complex.Remote wind power base is met with mostly sends out bottleneck, and problem of rationing the power supply is very tight
Weight.Nearest National Energy Board requires, and arranges Wind Power Generation scale and the important references of project layout to refer to using wind-electricity integration as new
Mark.
China's interconnected network scale is growing, and the uncertain factor for influencing Operation of Electric Systems increases, and contains large-scale wind electricity
The electric power networks of field, will not only consider these conventional indexs of economy, reliability, and the uncertain index new as one causes
The extensive concern of people needs to establish completeer since the uncertainty of wind-powered electricity generation makes power generation and operational plan face generate several factors
Kind appraisement system assesses the power grid containing wind power system.
Summary of the invention
The purpose of the present invention is to overcome above-mentioned technical deficiency, solve in the prior art due to the uncertainty of wind-powered electricity generation, fill
Abundant property, economy, reliability are not able to satisfy the problem of containing large-scale wind electricity grid-connected electric system gradually, provide a kind of by drawing
Enter the probabilistic Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing of wind-powered electricity generation.
In order to realize the purpose, the specific embodiment that the present invention uses is as follows:
A kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing, which comprises the following steps:
1): the evaluation index of wind farm grid-connected scheme is determined, from safety, economy, these three uncertain sides of wind-powered electricity generation
Wind farm grid-connected scheme is comprehensively evaluated in face；
2): establishing overall evaluation system using analytic hierarchy process (AHP), 3 levels, destination layer, criterion will be divided into decision problem
Layer, solution layer；
3): calculating the basic data that all kinds of appraisement systems need, nondimensionalization processing is carried out to index and is classified again；
4): the judgment matrix of design criterions layer and indicator layer judges their consistency, solves its weight vectors, obtains
Index weights always sort, and calculate comprehensive assessment value；
5): obtaining maximum comprehensive evaluation value is corresponding optimal case.
Safety indexes refer to that generating and transmitting system bears the ability disturbed suddenly in the step 1), and disturbance refers to prominent suddenly
System element that is so short-circuit or losing unplanned outage comprising:
(1) main transformer " N-1 " verifies percent of pass TN:
Main transformer " N-1 " verifies the ability that percent of pass reaction power grid bears failure, and percent of pass is bigger, and the safety of power grid is got over
Good, calculation formula is as follows:
(2) high-tension line " N-1 " verifies percent of pass LN:
High-tension line " N-1 " verifies the ability that percent of pass reaction power grid bears failure, and percent of pass is bigger, the safety of power grid
Better, calculation formula is as follows:
Economic index refers to life cycle costing based on equipment in the step 1), chooses cost of investment of power grid and electricity
Net annual operating cost comprising:
(1) cost of investment (IC) of power grid:
In formula: AnIt is power equipment collection to be selected；μkIt is the Installed capital cost of equipment；ZkFor the decision variable of equipment, if setting
Standby plus k enters network, then Zk=1, otherwise Zk=0；M is the service life time limit of power grid；P is portfolio investment cost rate；
(2) power grid annual operating cost (OC):
In formula: νkFor the operation expense of equipment；A is power grid sale of electricity electricity price；W is active power loss；T is power grid annual
Power-on time, ZkFor the decision variable of equipment, if equipment adds k to enter network, Zk=1, otherwise Zk=0；M is the service life year of power grid
Limit；P is portfolio investment cost rate.
Wind-powered electricity generation uncertainty refers to the features such as randomness and intermittence due to wind-force itself in the step 1), so that wind
The operation of electric field has very big uncertainty, chooses voltage magnitude maximum fluctuation rate, voltage phase angle maximum fluctuation rate, packet
It includes:
(1) voltage magnitude maximum fluctuation rate:
Voltage magnitude maximum fluctuation rate=max | voltage magnitude when voltage magnitude-wind-powered electricity generation when wind-powered electricity generation is completely sent out is stopped paying out | ×
100%；
(2) voltage phase angle maximum fluctuation rate:
(3) apparent energy maximum changing amplitude:
Maximum changing amplitude=max (apparent energy of route when route apparent energy-wind-powered electricity generation when wind-powered electricity generation is completely sent out is stopped paying out).
The calculating of the step 4) includes the following steps:
(1) check whether consistency check passes through by calculating consistency ration；
The wherein calculating judgment formula of consistency ration are as follows:
C.I. is the index for judging consistency, calculation formula in formula are as follows:
R.I is Aver-age Random Consistency Index；
(2) in the case where consistency passes through, the maximum eigenvalue of calculating matrix and its corresponding feature vector calculate
Weight of a certain factor relative to the relative importance of upper level factor:
Seek BX=λmaxThe feature vector, X of X, X={ x1,x2,...xiIts corresponding point weight XiIt is the element in this layer
Weight in secondary；
(3) total hierarchial sorting is carried out:
Using the single sequence of all levels as a result, calculating a relatively upper level for, this level all elements are relatively heavy
The weight for the property wanted, referred to as total hierarchial sorting:
According to all elements A in a upper level1, A2..., AnTotal sequence, obtaining weight is respectively a1, a2..., am, with
AiCorresponding this hierarchical elements B1, B2..., BnSingle ranking results be b1i..., bni, then B level is always ordered as
(4) comprehensive evaluation result is calculated:
The calculation method of the comprehensive evaluation value of numerical procedure is as follows:
Wherein aijIt is the weight of total hierarchial sorting, yiFor the result of the nondimensionalization of evaluation index；
When carrying out nondimensionalization to index, frequently with extremum method, calculation formula is as follows:
Wherein xiFor the index value of i-th kind of scheme, yiExtremum method processing costs is obtained for i-th kind of scheme index value, n is scheme
Number.
The beneficial effects of the present invention are: the present invention is according to the existing power transmission network situation containing Large Scale Wind Farm Integration, binder course
The establishment principle of fractional analysis overall evaluation system establishes and considers probabilistic grid-connected program evaluation body of Large Scale Wind Farm Integration
System, can more accurately assess influence of the wind-electricity integration to Electric Power Network Planning, provide data foundation for Electric Power Network Planning personnel, optimize
Electric Power Network Planning benefit has very strong practical value.
Detailed description of the invention
Fig. 1 is wind power plant integration scenario estimation flow figure of the invention.
Fig. 2 is wind farm grid-connected scheme appraisement system block diagram of the invention.
Specific embodiment
Structure of the invention and its advantages are further illustrated below in conjunction with attached drawing 1-2.
The Electric Power Network Planning evaluation method that a kind of consideration wind-electricity integration as described in Fig. 1-2 influences, is containing Large Scale Wind Farm Integration
Electric system in need to choose its Electric Power Network Planning problem, select which kind of wind-electricity integration mode more preferable, can be according to institute
State method progress.
Initially set up evaluation index system, it is necessary to which establishing rationally science, objective indicator evaluation system, index system must abide by
Corresponding principle is followed, is not to pile up one group of arbitrary index.
The grid entry point of Large Scale Wind Farm Integration is generally on the power transmission network of 220kv or more at present, therefore the scheme of Transmission Expansion Planning in Electric
Appraisement system applies generally to the appraisement system of Large Scale Wind Farm Integration connect-in strategy, but the uncertainty for essentially consisting in wind power plant causes
Input active power, the stability problem of voltage it is larger.
The evaluation requirement of power transmission network, the uncertainty of wind-powered electricity generation and obtained data are considered, from safety, economy and wind-powered electricity generation
Uncertain three aspects carry out overall merit:
1) safety indexes:
Safety refers to that generating and transmitting system bears the ability disturbed suddenly, and disturbance suddenly refers to suddenly-applied short circuit or loses non-meter
Draw the system element stopped transport.
(1) main transformer " N-1 " verifies percent of pass TN:
Main transformer " N-1 " verifies the ability that percent of pass reaction power grid bears failure, and percent of pass is bigger, and the safety of power grid is got over
Good, calculation formula is as follows:
(2) high-tension line " N-1 " verifies percent of pass LN:
High-tension line " N-1 " verifies the ability that percent of pass reaction power grid bears failure, and percent of pass is bigger, the safety of power grid
Better, calculation formula is as follows:
2) economic index:
Economic evaluation index to power grid is life cycle costing based on equipment, chooses cost of investment of power grid and power grid
Annual operating cost
(1) cost of investment (IC) of power grid:
In formula: An is power equipment collection to be selected；μkIt is the Installed capital cost of equipment；ZkFor the decision variable of equipment, if setting
Standby plus k enters network, then Zk=1, otherwise Zk=0；M is the service life time limit of power grid；P is that portfolio investment cost rate (considers bank's benefit
The factors such as rate, price-rise factor, funding risk can obtain the value by seeking advice from investment company).
(2) power grid annual operating cost (OC):
In formula: νkFor the operation expense of equipment；A is power grid sale of electricity electricity price；W is active power loss；T is power grid annual
Power-on time, ZkFor the decision variable of equipment, if equipment adds k to enter network, Zk=1, otherwise Zk=0；M is the service life year of power grid
Limit；P is that portfolio investment cost rate (considers the factors such as bank rate, price-rise factor, funding risk, can be invested by consulting
Company obtains the value).
3) wind-powered electricity generation uncertainty index:
Wind-powered electricity generation uncertainty refers to the features such as randomness and intermittence due to wind-force itself, so that the operation of wind power plant has
There is very big uncertainty, chooses voltage magnitude maximum fluctuation rate, voltage phase angle maximum fluctuation rate.
(1) voltage magnitude maximum fluctuation rate:
Voltage magnitude maximum fluctuation rate=max | voltage magnitude when voltage magnitude-wind-powered electricity generation when wind-powered electricity generation is completely sent out is stopped paying out | ×
100%
(2) voltage phase angle maximum fluctuation rate:
(3) apparent energy maximum changing amplitude:
Maximum changing amplitude=max (apparent energy of route when route apparent energy-wind-powered electricity generation when wind-powered electricity generation is completely sent out is stopped paying out)
Secondly according to index system establishment principle, B safety is established, C economy, uncertain 3 level-ones of D wind-powered electricity generation refer to
Mark.
Mode of Level Simple Sequence is carried out, the corresponding weight of each interpretational criteria is further calculated using analytic hierarchy process (AHP).
Judgement Matricies carry out assignment to judgment matrix interior element:
Wherein bijIt indicates to AkFor, BiOpposite BjThe numerical value of significance level embodies
1 judgment matrix structural form of table
| Ak | B1 | B2 | … | Bn |
| B1 | b11 | b12 | … | b1n |
| B2 | b21 | b22 | … | b2n |
| … | … | … | … | … |
| Bn | bn1 | bn2 | … | bnm |
bij1,2,3 can be taken ..., 9 is reciprocal with it, and numerical value can be taken accordingly by table 2, table 3.
2 different degree of table defines table
3 different degrees of table define table
| Comparison marking | Relative importance | Explanation |
| 1/3 | It is slightly inessential | Indicate BiCompare BjIt is slightly inessential |
| 1/5 | It is obvious inessential | Indicate BiCompare BjIt is obvious inessential |
| 1/7 | It is strong inessential | Indicate BiCompare BjIt is strong inessential |
| 1/9 | It is extremely inessential | Indicate BiCompare BjIt is extremely inessential |
| 2,4,6,8 | Neighboring extent median | It is used when needing to compromise |
Then the judgment matrix of design criterions layer checks whether consistency check passes through by calculating consistency ration.
4) consistency ration calculation formula:
C.I. is the index for judging consistency in formula, calculation formula:
R.I is Aver-age Random Consistency Index, and value rule is as shown in table 4.
4 RI value rule of table
| Stage | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| RI | 0.00 | 0.00 | 0.58 | 0.90 | 1.12 | 1.24 | 1.32 | 1.41 | 1.45 |
When institute's structure matrix has satisfied consistency, otherwise needs to readjust, full until having
The consistency of meaning.
In the case where consistency passes through, the maximum eigenvalue of calculating matrix and its corresponding feature vector calculate certain
Weight of one factor relative to the relative importance of upper level factor.
Seek BX=λmaxThe feature vector, X of X, X={ x1,x2,...xiIts corresponding point weight XiIt is the element in this layer
Weight in secondary.
5) total hierarchial sorting is carried out:
Using the single sequence of all levels as a result, calculating a relatively upper level for, this level all elements are relatively heavy
The weight for the property wanted, referred to as total hierarchial sorting.
According to all elements A in a upper level1, A2..., AnTotal sequence, obtaining weight is respectively a1, a2..., am, with
Ai corresponds to this hierarchical elements B1, B2..., BnSingle ranking results be b1i..., bni, then B level is always ordered as
6) comprehensive evaluation result is calculated:
The calculation method of the comprehensive evaluation value of numerical procedure is as follows
Wherein aijIt is the weight of total hierarchial sorting, yiFor the result of the nondimensionalization of evaluation index.
When carrying out nondimensionalization to index, frequently with extremum method, calculation formula is as follows:
Wherein xiFor the index value of i-th kind of scheme, yiExtremum method processing costs is obtained for i-th kind of scheme index value, n is scheme
Number.
According to the existing power transmission network situation containing Large Scale Wind Farm Integration, the foundation of binding hierarchy analytic approach overall evaluation system is former
Then, it establishes and considers probabilistic grid-connected program evaluation system of Large Scale Wind Farm Integration.
Below according to the present invention will be described for somewhere:
It is sent through two different routes to the wind-electricity integration of substation bus bar according under the identical power output of areal wind power plant A
Scheme, obtained primary data and data processing such as table 5.
5 primary data of table and processing
Indicator layer judgment matrix is constructed, maximum eigenvalue and feature vector, and check consistency are found out.
6 safety indexes layer judgment matrix of table
| Index classification | B1 | B2 |
| B1 | 1 | 1/3 |
| B2 | 3 | 1 |
Eigenvalue λmax=2, corresponding feature vector x=[0.750,0.250].Matrix is two ranks, is examined without consistency
It tests.
7 economic index layer judgment matrix of table
| Pointer type | C1 | C2 |
| C1 | 1 | 7 |
| C2 | 7 | 1 |
Eigenvalue λmax=2, corresponding feature vector x=[0.875,0.125].Matrix is two ranks, consistent without examining
Property.
The uncertain indicator layer judgment matrix of table 8
| Pointer type | D1 | D2 | D3 |
| D1 | 1 | 3 | 5 |
| D2 | 1/3 | 1 | 3 |
| D3 | 1/5 | 1/3 | 1 |
Eigenvalue λmax=3, character pair vector x=[0.219,0.619,0.162] carries out consistency check,Consistency check passes through.
Construct first class index judgment matrix, consider that electric network security relative importance is larger, wind-powered electricity generation it is uncertain secondly, through
Importance is smaller establishes following matrix for Ji property:
9 first class index judgment matrix of table
| Index classification | B | C | D |
| B | 1 | 9 | 3 |
| C | 1/9 | 1 | 1/5 |
| D | 1/3 | 5 | 1 |
Eigenvalue λmax=3, corresponding feature vector x=[0.5439,0.2515,0.2046], and carry out consistency check
It meets the requirements.
The comprehensive evaluation value of 10 connect-in strategy of table
According to calculating it is found that two D2, D3 of scheme influence larger, economic index weight in wind-powered electricity generation uncertainty index
It remains basically stable, and security scheme one B1, B2 are affected, it is comprehensive to know that scheme one is more excellent.
Those skilled in the art can change index according to the actual electric network to be calculated accordingly.
The advantages and positive effects of the present invention are: the present invention is according to the existing power transmission network feelings containing Large Scale Wind Farm Integration
Condition, the establishment principle of binding hierarchy analytic approach overall evaluation system establish and consider probabilistic Large Scale Wind Farm Integration and network planning
Appraisement system is drawn, can more accurately assess influence of the wind-electricity integration to Electric Power Network Planning, personnel provide data for Electric Power Network Planning
Foundation optimizes Electric Power Network Planning benefit, has very strong practical value.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing, which comprises the following steps:
1): the evaluation index of wind farm grid-connected scheme is determined, from safety, economy, these three uncertain aspects of wind-powered electricity generation
Comprehensively evaluate wind farm grid-connected scheme；
2): establish overall evaluation system using analytic hierarchy process (AHP), will be divided into 3 levels to decision problem, destination layer, rule layer,
Solution layer；
3): calculating the basic data that all kinds of appraisement systems need, nondimensionalization processing is carried out to index and is classified again；
4): the judgment matrix of design criterions layer and indicator layer judges their consistency, solves its weight vectors, obtains index
Weight always sorts, and calculates comprehensive assessment value；
5): obtaining maximum comprehensive evaluation value is corresponding optimal case.
2. a kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing according to claim 1, it is characterised in that: institute
It states safety indexes in step 1) and refers to that generating and transmitting system bears the ability disturbed suddenly, disturbance refers to suddenly-applied short circuit or mistake suddenly
Remove the system element of unplanned outage comprising:
(1) main transformer " N-1 " verifies percent of pass TN:
Main transformer " N-1 " verifies the ability that percent of pass reaction power grid bears failure, and percent of pass is bigger, and the safety of power grid is better, meter
It is as follows to calculate formula:
(2) high-tension line " N-1 " verifies percent of pass LN:
High-tension line " N-1 " verifies the ability that percent of pass reaction power grid bears failure, and percent of pass is bigger, and the safety of power grid is got over
Good, calculation formula is as follows:
3. a kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing according to claim 1, it is characterised in that: institute
It states economic index in step 1) and refers to life cycle costing based on equipment, choose cost of investment of power grid and power grid annual running cost
With comprising:
(1) cost of investment (IC) of power grid:
In formula: AnIt is power equipment collection to be selected；μkIt is the Installed capital cost of equipment；ZkFor the decision variable of equipment, if equipment adds
K enters network, then Zk=1, otherwise Zk=0；M is the service life time limit of power grid；P is portfolio investment cost rate；
(2) power grid annual operating cost (OC):
In formula: νkFor the operation expense of equipment；A is power grid sale of electricity electricity price；W is active power loss；T is power grid annual power supply
Time, ZkFor the decision variable of equipment, if equipment adds k to enter network, Zk=1, otherwise Zk=0；M is the service life time limit of power grid；p
For portfolio investment cost rate.
4. a kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing according to claim 1, it is characterised in that: institute
The features such as wind-powered electricity generation uncertainty in step 1) refers to the randomness and intermittence due to wind-force itself is stated, so that the operation of wind power plant
With very big uncertainty, voltage magnitude maximum fluctuation rate, voltage phase angle maximum fluctuation rate are chosen comprising:
(1) voltage magnitude maximum fluctuation rate:
Voltage magnitude maximum fluctuation rate=max | voltage magnitude when voltage magnitude-wind-powered electricity generation when wind-powered electricity generation is completely sent out is stopped paying out | × 100%
(2) voltage phase angle maximum fluctuation rate:
(3) apparent energy maximum changing amplitude:
Maximum changing amplitude=max (apparent energy of route when route apparent energy-wind-powered electricity generation when wind-powered electricity generation is completely sent out is stopped paying out).
5. a kind of Electric Power Network Planning evaluation method for considering wind-electricity integration and influencing according to claim 1, it is characterised in that: institute
The calculating for stating step 4) includes the following steps:
(1) check whether consistency check passes through by calculating consistency ration；
The wherein calculating judgment formula of consistency ration are as follows:
C.I. is the index for judging consistency, calculation formula in formula are as follows:
R.I is Aver-age Random Consistency Index；
(2) in the case where consistency passes through, the maximum eigenvalue of calculating matrix and its corresponding feature vector calculate a certain
Weight of the factor relative to the relative importance of upper level factor:
Seek BX=λmaxThe feature vector, X of X, X={ x1,x2,...xiIts corresponding point weight XiIt is the element in this level
Weight；
(3) total hierarchial sorting is carried out:
Using the single sequence of all levels as a result, calculating a relatively upper level for, this level all elements relative importance
Weight, referred to as total hierarchial sorting:
According to all elements A in a upper level1, A2..., AnTotal sequence, obtaining weight is respectively a1, a2..., am, with Ai pairs
Answer this hierarchical elements B1, B2..., BnSingle ranking results be b1i..., bni, then B level is always ordered as
(4) comprehensive evaluation result is calculated:
The calculation method of the comprehensive evaluation value of numerical procedure is as follows:
Wherein aijIt is the weight of total hierarchial sorting, yiFor the result of the nondimensionalization of evaluation index；
When carrying out nondimensionalization to index, frequently with extremum method, calculation formula is as follows:
Wherein xiFor the index value of i-th kind of scheme, yiExtremum method processing costs is obtained for i-th kind of scheme index value, n is scheme number.
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