CN109784742A - Unit primary frequency modulation performance comprehensive estimation method and system based on combination weights method - Google Patents
Unit primary frequency modulation performance comprehensive estimation method and system based on combination weights method Download PDFInfo
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Abstract
The invention proposes a kind of unit primary frequency modulation performance comprehensive estimation method and system based on combination weights method, wherein, method includes the following steps: establishing unit primary frequency modulation evaluation index system, and initial assessment index is obtained according to unit primary frequency modulation evaluation index system；Initial assessment index is normalized to obtain final evaluation index；Subjective decision method is respectively adopted to final evaluation index to calculate, to obtain the subjective weight and objective weight of index；Using the subjective weight of least square method parameter and the comprehensive weight of objective weight, and according to the comprehensive evaluation result of comprehensive weight acquisition unit.This method establishes complete index structure, the overall merit of unit primary frequency modulation has been acquired in conjunction with objective and subjective synthetic approach, as a result more comprehensive, objective, reasonable, facilitate the primary frequency modulation performance that management and running department analyzes each unit in power grid comprehensively, it is managed and examines convenient for establishing database to it, be able to ascend supervision and evaluation quality.
Description
Technical field
The present invention relates to electric system net source coordination administrative skill field, in particular to a kind of machines based on combination weights method
Group primary frequency modulation performance comprehensive estimation method and system.
Background technique
The running frequency of electric system is that can one of most basic index of power quality and electric system safety and stability
The basis of operation.For operation of power networks, it is desirable that guarantee that frequency control near standard value, otherwise, will result in power generation and electricity consumption
The damage of all kinds of establishings in side will further result in the collapse of frequency of system if causing a large amount of compressor emergency shutdowns, cause serious
Large area blackout.
Important foundation means of the primary frequency modulation as power grid frequency modulation, accurate frequency modulation movement are conducive to be obviously improved power grid frequency
Rate qualification rate improves power supply quality；Under the premise of having enough spare capacities and reflection speed, electricity can also be significantly improved
Frequency stability when net reply burst accident impact, maintains frequency in controlled range, machine, the generation of cutting load are cut in reduction.
With deepening continuously for power market reform, the appraisal management difficulty of generator is increased after separating the factory and network.Due to throwing
Entering primary frequency function will cause Adjusting system and the certain fluctuation of therrmodynamic system, and part electricity power enterprise only focuses on unit fortune
Row stability cuts off primary frequency function for a long time or increases operating dead zone, so that the Primary frequency control ability of power grid is weakened,
The quasi-steady state underfrequency for causing system after accident may cause low cycles unloading device movement, be unfavorable for the safety and stability of system
Operation.Therefore, how in real time, accurately assess unit Primary frequency control ability, to supervise power plant keep generating set it is good
Primary frequency modulation performance, and the primary frequency modulation level of the whole network, the running quality for increasing power grid and stability are grasped in real time with weight
Want meaning.
Currently, the appraisal procedure of unit primary frequency modulation is divided into offline evaluation and online evaluation, offline evaluation is right at the scene
Generating set carries out experiment test.Online evaluation is the data of frequency and active power output based on on-line monitoring, and it is real to calculate unit
Chirp parameter in the operational process of border is more advantageous to the frequency modulation behavior of specification power plant.But there are indexs for existing appraisal procedure
The problems such as system is unsound, only calculates isolated index, lacks the overall merit to unit is unfavorable for playing the excellent of online evaluation
Point, it is difficult to the fm capacity of comprehensive control full electric network unit.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of, the unit primary frequency modulation performance based on combination weights method is comprehensive
Appraisal procedure.This method makes assessment result more comprehensive, objective, reasonable, facilitates management and running department and analyzes power grid comprehensively
In each unit primary frequency modulation performance, be managed and examine convenient for establishing database to it, be able to ascend supervision and evaluation
Quality.
It is another object of the present invention to propose that a kind of unit primary frequency modulation performance based on combination weights method is comprehensive to comment
Estimate system.
In order to achieve the above objectives, it is comprehensive to propose the unit primary frequency modulation performance based on combination weights method for one aspect of the present invention
Appraisal procedure, comprising the following steps: establish unit primary frequency modulation evaluation index system, and assessed according to the unit primary frequency modulation
Index system obtains initial assessment index；The initial assessment index is normalized, after obtaining normalized
Final evaluation index；The final evaluation index is respectively adopted in the Delphi method and objective making decision method in subjective decision method
CRITIC method calculated, to obtain the subjective weight and objective weight of the index；And it is calculated using least square method
The subjective weight of the index and the comprehensive weight of objective weight, and according to the overall merit knot of comprehensive weight acquisition unit
Fruit.
The unit primary frequency modulation performance comprehensive estimation method based on combination weights method of the embodiment of the present invention, by establishing
Line database, can by the frequency modulation result real-time update of unit, can vertical and horizontal must analyze unit frequency modulation performance, help
In the monitoring level for promoting dispatching of power netwoks, it can be obviously improved the operation and maintenance level of power plant, ensure power network safety operation.
In addition, the unit primary frequency modulation performance comprehensive assessment side according to the above embodiment of the present invention based on combination weights method
Method can also have following additional technical characteristic:
It is optionally, in one embodiment of the invention, described to establish complete unit primary frequency modulation evaluation index system,
Its described evaluation index includes: to adjust dead zone, difference coefficient, lag time and stablize time, contribution rate, throw ratio and positive positive motion
Make one or more in rate.
Further, in one embodiment of the invention, the Delphi method is according to default field assessment result to institute
It states final evaluation index and carries out feedback modifiers, to obtain the subjective weight, the CRITIC method is according to specific strength and evaluation
The objective weight is determined based on conflicting between index.
Further, in one embodiment of the invention, if the initial assessment index is positive index a, normalizing
Change formula are as follows:
Wherein, amaxIt is maximum value of each assessment object (unit) on index a, aminIt is each assessment object (unit)
Minimum value on index a, for positive index, when a is optimal performance amaxWhen,It is 1；When a reaches worst performance amin
When,It is 0；
amaxThe optimal performance of unit a in index is embodied, if one reference unit of setting, the index a of the reference unit
With regard to as amaxMinimum value,
If the initial assessment index negative sense index, normalizes formula are as follows:
When a is optimal performance aminWhen,It is 1；When a reaches worst performance amaxWhen,It is 0；
aminOptimal performance of the unit on index a is embodied, if as soon as setting reference unit, the index a of reference unit make
For aminMinimum value.
Further, in one embodiment of the invention, the calculation formula of the comprehensive weight are as follows:
W=[w1,w2,...wm]T
Wherein, W indicates comprehensive weight, wmIndicate m-th of index；
The assessment formula of the postitallation evaluation are as follows:
Wherein, wjIndicate j-th of expert, zijData matrix after indicating standardization.
In order to achieve the above objectives, another aspect of the present invention proposes a kind of unit primary frequency modulation based on combination weights method
Energy integrated estimation system, comprising: module is established, for establishing unit primary frequency modulation evaluation index system, and according to the unit
Primary frequency modulation evaluation index system obtains initial assessment index；Processing module, for carrying out normalizing to the initial assessment index
Change processing, to obtain the final evaluation index after normalized；Module is obtained, for adopting respectively to the final evaluation index
It is calculated with the CRITIC method in the Delphi method and objective making decision method in subjective decision method, to obtain the subjectivity of the index
Weight and objective weight；And computing module, for calculating the subjective weight and objective power of the index using least square method
The comprehensive weight of weight, and according to the comprehensive evaluation result of comprehensive weight acquisition unit.
The unit primary frequency modulation performance integrated estimation system based on combination weights method of the embodiment of the present invention, by establishing
Line database, can by the frequency modulation result real-time update of unit, can vertical and horizontal must analyze unit frequency modulation performance, help
In the monitoring level for promoting dispatching of power netwoks, it can be obviously improved the operation and maintenance level of power plant, ensure power network safety operation.
In addition, the unit primary frequency modulation performance comprehensive assessment system according to the above embodiment of the present invention based on combination weights method
System can also have following additional technical characteristic:
Optionally, in one embodiment of the invention, it is described establish evaluation index described in module include: adjust it is dead
It is one or more in area, difference coefficient, lag time and stable time, contribution rate, throw ratio and performance factor.
Further, in one embodiment of the invention, the Delphi method is according to default field assessment result to institute
It states final evaluation index and carries out feedback modifiers, to obtain the subjective weight, the CRITIC method is according to specific strength and evaluation
The objective weight is determined based on conflicting between index.
Further, in one embodiment of the invention, if the initial assessment index is positive index a, normalizing
Change formula are as follows:
Wherein, amaxIt is maximum value of each assessment object (unit) on index a, aminIt is each assessment object (unit)
Minimum value on index a, for positive index, when a is optimal performance amaxWhen,It is 1；When a reaches worst performance amin
When,It is 0；
amaxThe optimal performance of unit a in index is embodied, if one reference unit of setting, the index a of the reference unit
With regard to as amaxMinimum value,
If the initial assessment index negative sense index, normalizes formula are as follows:
When a is optimal performance aminWhen,It is 1；When a reaches worst performance amaxWhen,It is 0；
aminOptimal performance of the unit on index a is embodied, if as soon as setting reference unit, the index a of reference unit make
For aminMinimum value.
Further, in one embodiment of the invention, the calculation formula of the comprehensive weight are as follows:
W=[w1,w2,...wm]T
Wherein, W indicates comprehensive weight, wmIndicate m-th of index；
The assessment formula of the postitallation evaluation are as follows:
Wherein, wjIndicate j-th of expert, zijData matrix after indicating standardization.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the unit primary frequency modulation performance comprehensive estimation method stream based on combination weights method according to the embodiment of the present invention
Cheng Tu；
Fig. 2 is the unit primary frequency modulation appraisal procedure figure according to the embodiment of the present invention；
Fig. 3 is that power flow chart is assigned according to the Delphi of the embodiment of the present invention；
Fig. 4 is the unit primary frequency modulation performance integrated estimation system based on combination weights method according to the embodiment of the present invention
Structural schematic diagram.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The unit primary frequency modulation based on combination weights method proposed according to embodiments of the present invention is described with reference to the accompanying drawings
Can comprehensive estimation method and system be described, describe to propose according to embodiments of the present invention first with reference to the accompanying drawings based on synthesis
The unit primary frequency modulation performance comprehensive estimation method of enabling legislation.
Fig. 1 is the unit primary frequency modulation performance comprehensive estimation method stream based on combination weights method of one embodiment of the invention
Cheng Tu.
As shown in Figure 1, should unit primary frequency modulation performance comprehensive estimation method based on combination weights method the following steps are included:
In step s101, unit primary frequency modulation evaluation index system is established, and according to unit primary frequency modulation evaluation index
System obtains initial assessment index.
Optionally, in one embodiment of the invention, it establishes in complete unit primary frequency modulation evaluation index system and comments
Estimating index includes: to adjust dead zone, difference coefficient, lag time and stablize in time, contribution rate, throw ratio and performance factor
It is one or more.
Specifically, adjusting dead zone is to improve set steady, dead zone is set near rated speed, makes unit to frequency
Minor fluctuations do not generate adjustment effect.For example, the unit dead zone size of rated speed 3000r/min is ± 2r/min, then machine
Unit primary frequency modulation is failure to actuate when within the scope of group revolving speed 2998r/min~3002r/min.
Currently, the action signal of the big multi-configuration primary frequency modulation of the unit newly to put into operation can export dynamic when frequency exceeds dead zone
Make signal, calculates the deviation of frequency and standard frequency at this time, the estimated value in dead zone is acquired with this.
εi=fi-fref (1)
Wherein, fiIt is the frequency of action moment, frefIt is standard frequency, generally 50Hz, εiIt is calculated dead zone.
Difference coefficient is during the frequency of generating set once adjusts, and the curve of output power and frequency relation claims
For the power-frequency static characteristic of generating set, it can approximatively indicate that the tune that thus can calculate generator is poor with straight line
Coefficient.
The calculation formula of difference coefficient:
Wherein, Δ f is the difference of the frequency before frequency adjusted and adjustment, unit Hz；Δ P is that unit adjusted has
The difference of unit active power output before function power output and adjustment, unit MW；fnFor rated frequency, unit Hz；PnIt is specified fixed active
Power, unit MW.
Lag time and to stablize time calculation formula as follows:
Unit reaction speed lag time TlagTo assess:
Tlag=Tp_begin-Tf_beyond (3)
Wherein, Tp_beginAt the time of variation takes place for active power output；Tf_beyondFor mains frequency be more than threshold value when
It carves.Lag time is shorter, and the reaction for indicating that unit changes frequency is faster.
Unit is regulated the speed with stablizing time TstableTo assess:
Tstable=Tp_begin-TP_end (4)
In formula, Tp_beginAt the time of variation takes place for active power output；TP_endAfter the adjustment for generated power power output
At the time of reaching new stationary value.The stable time is shorter, indicates that the speed of unit adjustment is faster.
Contribution rate K is the ratio of actual contribution electricity and theory contribution electricity, shown in expression formula such as formula (5):
Wherein, HiFor unit actual contributing electricity during the adjustment；HgFor unit theoretical contribution during the adjustment
Electricity.
Shown in actual contributing electricity expression formula such as formula (6):
Wherein,t0At the time of being more than threshold value for mains frequency；ttAt the time of returning to threshold value for mains frequency, when maximum integrates
Between be 1min, if it exceeds 1min then remembers according to 1min；PtFor the unit active power output of the t moment in integral process；P0For t0When
Carve the active power output of unit.
Shown in theoretical contributing electricity expression formula such as formula (7):
Wherein, Δ f (t) is the mains frequency of t moment and the deviation of threshold value；fnFor rated frequency；δsetFor theoretic machine
Difference coefficient examination value as defined in the setting value or power grid of group difference coefficient, generally takes 5%；PnFor rated active power.
It is as follows that unit primary frequency modulation operational percentage (moon) counts calculating formula:
It can be calculated with similar formula to count daily or annual primary frequency modulation operational percentage, it need to will formula above
In related moon statistic be changed to relevant date or related year statistic.Primary frequency modulation to calculate full factory, certain power plant puts into operation
Rate averages the primary frequency modulation operational percentage of each unit in the factory.
Shown in the calculation formula such as formula (9) of unit primary frequency modulation moon performance factor F:
In formula, fcorrectFor monthly correct action frequency；ftotalExceed threshold value for monthly frequency, what unit should act
Number.It is generally believed that unit of the performance factor less than 40%, does not put into primary frequency function.
In step s 102, initial assessment index is normalized, to obtain the most final review after normalized
Estimate index.
Further, in one embodiment of the invention, if initial assessment index is positive index a, public affairs are normalized
Formula are as follows:
Wherein, amaxIt is maximum value of each assessment object (unit) on index a, aminIt is each assessment object (unit)
Minimum value on index a, for positive index, when a is optimal performance amaxWhen,It is 1；When a reaches worst performance amin
When,It is 0；
amaxThe optimal performance of unit a in index is embodied, if as soon as setting reference unit, the index a of reference unit make
For amaxMinimum value,
If initial assessment index negative sense index, normalizes formula are as follows:
When a is optimal performance aminWhen,It is 1；When a reaches worst performance amaxWhen,It is 0；
aminOptimal performance of the unit on index a is embodied, if as soon as setting reference unit, the index a of reference unit make
For aminMinimum value.
It should be noted that similarly for amin, optimal performance of the unit on index a is embodied, a ginseng can be set
Burn-in group, the index a of reference unit can serve as possible maximum standard value, realize the normalized of index,
All indexs are turned to the positive index between 0 to 1.
In step s 103, as shown in Fig. 2, to final evaluation index be respectively adopted Delphi method in subjective decision method and
CRITIC method in objective making decision method is calculated, to obtain the subjective weight and objective weight of index.
Wherein, Delphi is a kind of expert consulting method, and target is to concentrate the suggestion of multidigit expert, obtains specific area
Expert's assessment result is usually used in planning, plan, prediction and assessment etc..The characteristics of Delphi is to be solicited by way of anonymous specially
The opinion of family, and constantly summarize as a result, carrying out feedback modifiers and obtain compellent conclusion so that expert opinion is gradually unified,
It is prediction, the evaluation method of a kind of fixed guantity combining with fixed quality made an appraisal to evaluation object.
Further, in one embodiment of the invention, using the Delphi method and objective making decision in subjective decision method
CRITIC method in method calculates separately, wherein Delphi method carries out final evaluation index according to default field assessment result anti-
Feedback amendment, to obtain subjective weight, CRITIC method based on the conflicting between specific strength and evaluation index according to determining
Objective weight.
For example, as shown in figure 3, Delphi method is a kind of subjective weights method since result depends on expertise,
Specific in the assessment of primary frequency modulation, realization process is as follows.
1, expert group is determined, this directly determines the reasonability of the weights finally obtained.Under normal circumstances, it to select
Select the expert 10-30 people or so for having practical work experience and deep theoretical preparation, it is ensured that it is to primary frequency modulation index weights
Opinion is professional enough, has referential.
2, the primary frequency modulation assessment indicator system of above-mentioned foundation is issued into expert, expert is asked to set up weight to it.It is required that each
The sum of weight is 1, and complete independently.
3, recycling is as a result, calculate the average and standard deviation of each weight.Expression is as follows:
Wherein, wi,jIt is the weighted value that j-th of expert provides i-th of index；M is expert's quantity；wiIt is i-th of index
Weighted mean；δiIt is the standard deviation of i-th of index weights.
4, result is arranged and feeds back to expert, it is desirable that the last round of result of expert reference provides index weights again.
5,3-4 is repeated, consults expert opinion repeatedly, until the standard deviation of the weight obtained is less than certain threshold value, i.e. majority
The conclusion of expert has reached unanimity, at this time weight of each mean value as index.
Specifically, CRITIC method is a kind of objective weight enabling legislation proposed by Diakoulaki.It is with two of data
The objective weight of index is determined based on basic conception.First is that it indicates that the same each evaluation of programme of index takes to specific strength
Value difference away from size, showed in the form of standard deviation, that is, standardize difference size show each scheme in same index
The value gap of the size of value gap, the more big each scheme of standard deviation is bigger.Second is that the conflicting between evaluation index, index it
Between conflicting be correlation between index based on, as having stronger positive correlation between two indices, illustrate two
Index conflicting is lower.The conflicting quantizating index of i-th of index and other indexs isrijBe i-th of index and
The related coefficient of j-th of index, m are index sums.
The objective weight of each index is to integrate measurement to specific strength and conflicting.If CiIndicate that j-th of evaluation refers to
Included information content is marked, then CiIt can indicate are as follows:
Wherein, δiIt is the standard deviation of i-th of index.
CiBigger, the information content for illustrating that i-th of index includes is bigger, and objective weight is also bigger.
In step S104, using the subjective weight of least square method parameter and the comprehensive weight of objective weight, and
The comprehensive evaluation result of unit is obtained according to comprehensive weight.
Further, in one embodiment of the invention, the calculation formula of comprehensive weight are as follows:
W=[w1,w2,...wm]T
Wherein, W indicates comprehensive weight, wmIndicate m-th of index；
The assessment formula of postitallation evaluation are as follows:
Wherein, wjIndicate j-th of expert, zijData matrix after indicating standardization.
Specifically, being obtained and above-mentioned the two the smallest comprehensive weight of weighted deviations under the meaning of least square.Enable benefit
The subjective weight of the primary frequency modulation index obtained with Delphi method indicates are as follows:
U=[u1,u2,...um]T (15)
Enabling the objective weight of the primary frequency modulation index obtained using CRITIC method is indicated are as follows:
V=[v1,v2,...vm]T (16)
If comprehensive weight indicates are as follows:
W=[w1,w2,...wm]T (17)
If primary frequency modulation shares m evaluation index, n platform participates in evaluation and electing unit, then the data matrix after standardizing is Zn×m。
Ideally, subjective and objective tax power result is the smaller the better apart from true result error, therefore establishes as follows most
Small square law optimum organization evaluation model:
Model is as follows:
This model is solved below, establishes Langrange function
Partial derivative is asked to L:
It is expressed in matrix as
Wherein,
E=[1,1 ... 1]T
W=[w1,w2,...wm]T
Above-mentioned matrix is solved, is obtained
The weight of comprehensive evaluation index is obtained.
After obtaining weight, the embodiment of the present invention can be obtained by the primary frequency modulation comprehensive assessment result of each unit.
The unit primary frequency modulation performance comprehensive estimation method based on combination weights method proposed according to embodiments of the present invention leads to
Cross and establish online database, can by the frequency modulation result real-time update of unit, can vertical and horizontal must analyze the frequency modulation of unit
Performance facilitates the monitoring level for promoting dispatching of power netwoks, can be obviously improved the operation and maintenance level of power plant, ensures power grid security
Stable operation.
The unit primary frequency modulation based on combination weights method proposed according to embodiments of the present invention is described referring next to attached drawing
It can integrated estimation system.
Fig. 4 is the unit primary frequency modulation performance integrated estimation system based on combination weights method of one embodiment of the invention
Structural schematic diagram.
As shown in figure 4, being somebody's turn to do the unit primary frequency modulation performance integrated estimation system 10 based on combination weights method includes: to establish mould
Block 100, obtains module 300 and computing module 400 at processing module 200.
Wherein, module 100 is established for establishing unit primary frequency modulation evaluation index system, and is commented according to unit primary frequency modulation
Assessment system obtains initial assessment index.Processing module 200 is for being normalized initial assessment index, to obtain
Final evaluation index after normalized.Module 300 is obtained final evaluation index is respectively adopted in subjective decision method
CRITIC method in Delphi method and objective making decision method is calculated, to obtain the subjective weight and objective weight of index.It calculates
Module 400 is used for the comprehensive weight of subjective weight and objective weight using least square method parameter, and according to synthetic weights
Recapture the comprehensive evaluation result for taking unit.The unit primary frequency modulation performance synthesis based on combination weights method of the embodiment of the present invention is commented
Estimating system 10 makes assessment result more comprehensive, objective, reasonable, facilitates management and running department and analyzes each machine in power grid comprehensively
The primary frequency modulation performance of group, is managed and examines convenient for establishing database to it, be able to ascend supervision and evaluation quality.
Optionally, in one embodiment of the invention, complete unit primary frequency modulation evaluation index system is established, is commented
Estimating index includes: to adjust dead zone, difference coefficient, lag time and stablize in time, contribution rate, throw ratio and performance factor
It is one or more.
Further, in one embodiment of the invention, Delphi method is according to default field assessment result to most final review
Estimate index and carry out feedback modifiers, to obtain subjective weight, CRITIC method is according to the conflicting between specific strength and evaluation index
Based on determine objective weight.
Further, in one embodiment of the invention, if initial assessment index is positive index a, public affairs are normalized
Formula are as follows:
Wherein, amaxIt is maximum value of each assessment object (unit) on index a, aminIt is each assessment object (unit)
Minimum value on index a, for positive index, when a is optimal performance amaxWhen,It is 1；When a reaches worst performance amin
When,It is 0；
amaxThe optimal performance of unit a in index is embodied, if as soon as setting reference unit, the index a of reference unit make
For amaxMinimum value,
If initial assessment index negative sense index, normalizes formula are as follows:
When a is optimal performance aminWhen,It is 1；When a reaches worst performance amaxWhen,It is 0；
aminOptimal performance of the unit on index a is embodied, if as soon as setting reference unit, the index a of reference unit make
For aminMinimum value.
Further, in one embodiment of the invention, the calculation formula of comprehensive weight are as follows:
W=[w1,w2,...wm]T
Wherein, W indicates comprehensive weight, wmIndicate m-th of index；
The assessment formula of postitallation evaluation are as follows:
Wherein, wjIndicate j-th of expert, zijData matrix after indicating standardization.
It should be noted that aforementioned to the unit primary frequency modulation performance comprehensive estimation method embodiment based on combination weights method
Explanation be also applied for the unit primary frequency modulation performance integrated estimation system based on combination weights method, it is no longer superfluous herein
It states.
The unit primary frequency modulation performance integrated estimation system based on combination weights method proposed according to embodiments of the present invention leads to
Cross and establish online database, can by the frequency modulation result real-time update of unit, can vertical and horizontal must analyze the frequency modulation of unit
Performance facilitates the monitoring level for promoting dispatching of power netwoks, can be obviously improved the operation and maintenance level of power plant, ensures power grid security
Stable operation.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of unit primary frequency modulation performance comprehensive estimation method based on combination weights method, which is characterized in that including following step
It is rapid:
Unit primary frequency modulation evaluation index system is established, and is initially commented according to the unit primary frequency modulation evaluation index system
Estimate index；
The initial assessment index is normalized, to obtain the final evaluation index after normalized；
The final evaluation index is respectively adopted the CRITIC method in the Delphi method and objective making decision method in subjective decision method
It is calculated, to obtain the subjective weight and objective weight of the index；And
The subjective weight of the index and the comprehensive weight of objective weight are calculated using least square method, and according to the synthetic weights
Recapture the comprehensive evaluation result for taking unit.
2. the unit primary frequency modulation performance comprehensive estimation method according to claim 1 based on combination weights method, feature
Be, it is described to establish complete unit primary frequency modulation evaluation index system, the evaluation index include: adjust dead zone, adjust it is poor
It is one or more in coefficient, lag time and stable time, contribution rate, throw ratio and performance factor.
3. the unit primary frequency modulation performance comprehensive estimation method according to claim 1 based on combination weights method, feature
It is, the Delphi method carries out feedback modifiers to the final evaluation index according to default field assessment result, to obtain
Subjective weight is stated, the CRITIC method is according to described objective to determine based on the conflicting between specific strength and evaluation index
Weight.
4. the unit primary frequency modulation performance comprehensive estimation method according to claim 1 based on combination weights method, feature
It is, if the initial assessment index is positive index a, normalizes formula are as follows:
Wherein, amaxIt is maximum value of each assessment object on index a, aminIt is minimum of each assessment object on index a
Value, for positive index, when a is optimal performance amaxWhen,It is 1；When a reaches worst performance aminWhen,It is 0；
amaxThe optimal performance of unit a in index is embodied, if as soon as setting reference unit, the index a of the reference unit make
For amaxMinimum value,
If the initial assessment index negative sense index, normalizes formula are as follows:
When a is optimal performance aminWhen,It is 1；When a reaches worst performance amaxWhen,It is 0；
aminOptimal performance of the unit on index a is embodied, if as soon as setting reference unit, the index a conduct of reference unit
aminMinimum value.
5. the unit primary frequency modulation performance comprehensive assessment side according to claim 1-4 based on combination weights method
Method, which is characterized in that wherein,
The calculation formula of the comprehensive weight are as follows:
W=[w1,w2,...wm]T
Wherein, W indicates comprehensive weight, wmIndicate m-th of index；
The assessment formula of the postitallation evaluation are as follows:
Wherein, wjIndicate j-th of expert, zijData matrix after indicating standardization.
6. a kind of unit primary frequency modulation performance integrated estimation system based on combination weights method characterized by comprising
Module is established, for establishing unit primary frequency modulation evaluation index system, and according to the unit primary frequency modulation evaluation index
System obtains initial assessment index；
Processing module, for the initial assessment index to be normalized, to obtain the most final review after normalized
Estimate index；
Obtain module, Delphi method and objective making decision method for the final evaluation index being respectively adopted in subjective decision method
In CRITIC method calculated, to obtain the subjective weight and objective weight of the index；And
Computing module, for calculating the subjective weight of the index and the comprehensive weight of objective weight using least square method, and
The comprehensive evaluation result of unit is obtained according to the comprehensive weight.
7. the unit primary frequency modulation performance integrated estimation system according to claim 6 based on combination weights method, feature
It is, described to establish module, the evaluation index includes: to adjust dead zone, difference coefficient, lag time and stablize time, tribute
It offers one or more in rate, throw ratio and performance factor.
8. the unit primary frequency modulation performance integrated estimation system according to claim 6 based on combination weights method, feature
It is, the Delphi method carries out feedback modifiers to the final evaluation index according to default field assessment result, to obtain
Subjective weight is stated, the CRITIC method is according to described objective to determine based on the conflicting between specific strength and evaluation index
Weight.
9. the unit primary frequency modulation performance integrated estimation system according to claim 6 based on combination weights method, feature
It is, if the initial assessment index is positive index a, normalizes formula are as follows:
Wherein, amaxIt is maximum value of each assessment object on index a, aminIt is minimum of each assessment object on index a
Value, for positive index, when a is optimal performance amaxWhen,It is 1；When a reaches worst performance aminWhen,It is 0；
amaxThe optimal performance of unit a in index is embodied, if as soon as setting reference unit, the index a of the reference unit make
For amaxMinimum value,
If the initial assessment index negative sense index, normalizes formula are as follows:
When a is optimal performance aminWhen,It is 1；When a reaches worst performance amaxWhen,It is 0；
aminOptimal performance of the unit on index a is embodied, if as soon as setting reference unit, the index a conduct of reference unit
aminMinimum value.
10. according to the described in any item unit primary frequency modulation performance comprehensive assessment systems based on combination weights method of claim 6-9
System, which is characterized in that wherein,
The calculation formula of the comprehensive weight are as follows:
W=[w1,w2,...wm]T
Wherein, W indicates comprehensive weight, wmIndicate m-th of index；
The assessment formula of the postitallation evaluation are as follows:
Wherein, wjIndicate j-th of expert, zijData matrix after indicating standardization.
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