CN107067099A - Wind power probability forecasting method and device - Google Patents

Wind power probability forecasting method and device Download PDF

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Publication number
CN107067099A
CN107067099A CN201710055611.XA CN201710055611A CN107067099A CN 107067099 A CN107067099 A CN 107067099A CN 201710055611 A CN201710055611 A CN 201710055611A CN 107067099 A CN107067099 A CN 107067099A
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wind power
condition
wind
error
power plant
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CN107067099B (en
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汪宁渤
乔颖
马明
吕清泉
陈钊
吴问足
周强
鲁宗相
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Tsinghua University
State Grid Corp of China SGCC
State Grid Gansu Electric Power Co Ltd
Wind Power Technology Center of Gansu Electric Power Co Ltd
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Tsinghua University
State Grid Corp of China SGCC
State Grid Gansu Electric Power Co Ltd
Wind Power Technology Center of Gansu Electric Power Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06QINFORMATION 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
    • G06Q10/00Administration; Management
    • G06Q10/04Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00Pattern recognition
    • G06F18/20Analysing
    • G06F18/23Clustering techniques
    • G06F18/232Non-hierarchical techniques
    • G06F18/2321Non-hierarchical techniques using statistics or function optimisation, e.g. modelling of probability density functions
    • G06F18/23213Non-hierarchical techniques using statistics or function optimisation, e.g. modelling of probability density functions with fixed number of clusters, e.g. K-means clustering
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06QINFORMATION 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
    • G06Q50/00Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06Electricity, gas or water supply

Abstract

The present invention relates to a kind of wind power probability forecasting method and device, methods described includes:According to history power output and historical forecast power, the statistical nature of wind power plant predicated error is obtained;The fluctuations in wind speed amount predicted the outcome according to the NWP of historical forecast power and wind power plant, obtains the condition complete or collected works of wind-powered electricity generation probabilistic forecasting;By K means clustering algorithms, condition complete or collected works are divided into some condition subsets;Error set formation condition experience distribution to being under each condition subset, and examine whether its numerical characteristic overlaps with numerical characteristic in the statistical nature of wind power plant predicated error;Clustered again by K means clustering algorithms if overlapping;And the wind power prediction result according to each moment and the distribution of condition experience, obtain wind power probabilistic forecasting result.The invention further relates to a kind of prediction meanss.The wind power probability forecasting method that the present invention is provided can provide error distribution function to otherness, with higher prediction accuracy.

Description

Wind power probability forecasting method and device
Technical field
The present invention relates to a kind of wind power probability forecasting method, more particularly to a kind of wind power probability forecasting method and Device.
Background technology
The randomness of wind-resources, fluctuation, the uncontrollability of uncertainty and wind power output are steady to the safety of power system Fixed operation brings larger puzzlement.Wind power prediction technology turns into indispensable technology.
However, in actual motion, the predicated error in wind power prediction result can not be avoided, traditional wind power The general point prediction using wind power of prediction, so as to can not provide wind power probabilistic information.Conventional wind power There is unpredictable predicated error in prediction, cause forecasting inaccuracy really, the security and stability analysis for influenceing power system, from And influence the validity of operational decisions result.
The content of the invention
In summary, it is necessory to propose a kind of method and device that accurately can be predicted to wind power probability.
A kind of wind power probability forecasting method, comprises the following steps:
According to history power output and historical forecast power, the statistical nature of wind power plant predicated error is obtained;
The fluctuations in wind speed amount predicted the outcome according to the NWP of historical forecast power and wind power plant, obtains wind-powered electricity generation probabilistic forecasting Condition complete or collected works;
By K-means clustering algorithms, condition complete or collected works are divided into some condition subsets;
Error set formation condition experience distribution to being under each condition subset, and examine its numerical characteristic and wind-powered electricity generation Whether numerical characteristic overlaps in the statistical nature of field prediction error;Gathered again by K-means clustering algorithms if overlapping Class;And
It is distributed according to the wind power prediction result at each moment and condition experience, obtains wind power probabilistic forecasting knot Really.
In one of the embodiments, the statistical nature of the wind power plant predicated error includes the equal of wind power plant predicated error Value E (X), variance Var (X), degree of bias Skew (X) and kurtosis Kurtosis (X);
In one of the embodiments, it is described according to history power output and historical forecast power, obtain wind power plant pre- The step of statistical nature for surveying error, includes:
Obtain the history power output of wind power plant within a predetermined period of time;
Obtain the historical forecast power of wind power plant within a predetermined period of time;
Calculate the error vector in predetermined amount of time;And
Each component in error vector is obtained, wind power plant predicated error sample value is constituted, calculates wind power plant predicated error Statistical nature.
In one of the embodiments, the wind speed ripple that the NWP according to historical forecast power and wind power plant predicts the outcome The step of momentum, condition complete or collected works for obtaining wind-powered electricity generation probabilistic forecasting, includes:
According to the historical forecast power of wind power plant in the predetermined amount of time of acquisition, obtain in moment t, wind power plant NWP is pre- Survey the fluctuations in wind speed amount of result;
Obtain the fluctuations in wind speed duration set that the fluctuations in wind speed amount at the moment from t-s to t-1 is constituted;And
The Descartes's collection for being mutually combined and being constituted by fluctuations in wind speed amount and the set is obtained, condition complete or collected works are used as.
In one of the embodiments, it is described by K-means clustering algorithms, condition complete or collected works are divided into some condition The step of collection, includes:
For condition complete or collected works, using K-means clustering algorithms, m clusters are classified as, that is, are classified as m individual mutually disjoint Condition subset, m numerical value is evenly distributed for the element number in 4~10, and each condition subset.
In one of the embodiments, the described pair of error set formation condition experience being under each condition subset is divided Cloth, and include the step of examine its numerical characteristic and whether numerical characteristic overlaps in the statistical nature of wind power plant predicated error:
To each condition subset Ci, obtain error sample set E under this conditioni, obtain wind-powered electricity generation work(at different conditions The experience distribution PDF of rate predicated errori, and be distributed to describe in condition C with the experience of wind power prediction erroriUnder error Stochastic variable ei:
ei~PDFi
The condition experience distribution of m error of one by one inspection, if special with numeral in the statistical nature of wind power plant predicated error The error empirical distribution function levied is overlapped.
It is in one of the embodiments, described to be distributed according to the wind power prediction result and condition experience at each moment, The step of obtaining wind power probabilistic forecasting result includes:
The wind power prediction result at moment t+k is obtained in tAnd moment t+k prediction of wind speed undulate quantity fluct+k
If real number pairIn condition subset Cj, select the error experience distribution PDF of the condition subsetj, And by error stochastic variable ejIt is used as the error stochastic variable at the t+k moment;
With reference to t+k wind power prediction resultObtain final probabilistic forecasting result:
Wherein,It is the result of wind power probabilistic forecasting, is stochastic variable, for describes the uncertain of wind power Information.
A kind of wind power probabilistic forecasting device, described device includes:
Feature calculation module, for according to history power output and historical forecast power, obtaining wind power plant predicated error Statistical nature;
Condition computing module, for the fluctuations in wind speed amount predicted the outcome according to the NWP of historical forecast power and wind power plant, is obtained Obtain the condition complete or collected works of wind-powered electricity generation probabilistic forecasting;
Sort module, for by K-means clustering algorithms, condition complete or collected works to be divided into some condition subsets;
Cluster module, for being distributed to the error set formation condition experience being under each condition subset, and examines it Whether numerical characteristic overlaps with numerical characteristic in the statistical nature of wind power plant predicated error;Clustered if overlapping by K-means Algorithm is clustered again;
Prediction module, is distributed for the wind power prediction result according to each moment and condition experience, obtains wind-powered electricity generation work( Rate probabilistic forecasting result.
The feature calculation module includes:
First acquisition unit, for obtaining the history power output of wind power plant within a predetermined period of time;
Second acquisition unit, the historical forecast power for obtaining wind power plant within a predetermined period of time;
First computing unit, for calculating the error in predetermined amount of time between history power output and historical forecast power Vector;
Second computing unit, for obtaining each component in error vector, constitutes wind power plant predicated error sample value, calculates The statistical nature of wind power plant predicated error.
The condition computing module includes:
Undulate quantity acquiring unit, for the historical forecast power of wind power plant in the predetermined amount of time according to acquisition, is obtained During moment t, the fluctuations in wind speed amount that wind power plant NWP predicts the outcome;
Duration set acquiring unit is fluctuated, for obtaining the fluctuations in wind speed amount that the fluctuations in wind speed amount at the moment from t-s to t-1 is constituted Set;
Condition complete or collected works' acquiring unit, the Descartes constituted is mutually combined for obtaining by fluctuations in wind speed amount and the set Collection, is used as condition complete or collected works.
The wind power probabilistic forecasting technology that the present invention is provided, using conditional probability distribution and K-means clustering algorithms as base Plinth, can provide error distribution function to otherness, with higher prediction accuracy.
Brief description of the drawings
The FB(flow block) for the wind power probabilistic forecasting that Fig. 1 provides for present example.
Embodiment
Further stated in detail below according to Figure of description and in conjunction with specific embodiments to technical scheme.
In large-scale wind electricity cluster, the power output of adjacent multiple wind power plants has stronger correlation, therefore can combine Wind power plant i wind speed measured value, and adjacent multiple strong correlation Power Output for Wind Power Field measured values carry out the exception of the wind power plant Data point calibration, by wind power plant i moment t exceptional data pointIt is corrected to what is estimated according to wind speed and spatial coherence Corrected power estimate
Realize that wind power plant i abnormal data point calibration needs to solve two key issues:First, certainty equivalence surveys wind speed and isWhen, the zone of reasonableness of power output value.When known to wind power plant equivalent power curve, the reasonable model of power output value Enclose as wind speedThe span determined with equivalent power curve bound intersection point.Second, determine wind power plant i current powers Value, can be based on the conditional probability distribution of strong correlation wind power plant (for example coefficient correlation is more than 0.5), carry out the sampling of condition recurrence and come It is determined that.Here only consider the reason for strong correlation wind power plant to be that conditional probability distribution dimension can be reduced, it is to avoid dimension calamity occur, and And for wind farm data correction, it is considered to strong correlation wind power plant can meet correction demand.
Referring to Fig. 1, the wind power probabilistic forecasting side based on clustering algorithm and error analysis that present example is provided Method, comprises the following steps:
Step S10, obtains the statistical nature of wind power plant predicated error.
Specifically, in one of the embodiments, the acquisition of the statistical nature of wind power plant predicated error includes:
Step S11, obtains the history power output of wind power plant within a predetermined period of time, is:
Wherein, t is current time, and s is the historical data duration reviewed forward.
Step S12, obtains the historical forecast power of wind power plant within a predetermined period of time, is:
Step S13, calculates the error vector between the history power output and historical forecast power in predetermined amount of time, For:
Step S14, obtains each component in error vector, constitutes wind power plant predicated error sample value, calculate wind power plant pre- Survey the statistical nature of error.
Specifically, the statistical nature of wind power plant predicated error may include average E (X), the variance Var of wind power plant predicated error (X), degree of bias Skew (X) and kurtosis Kurtosis (X).The X can be made to beIn the wind power plant predicated error sample that constitutes of each component Collection, calculates the statistical nature of wind power plant predicated error:Average E (X), variance Var (X), degree of bias Skew (X) and kurtosis Kurtosis (X)。
Step S20, according to historical forecast power and the NWP of wind power plant (numerical weather forecast, numerical weather Prediection the fluctuations in wind speed amount) predicted the outcome, obtains the condition complete or collected works of wind-powered electricity generation probabilistic forecasting.
Specifically, in one of the embodiments, the condition complete or collected works of wind-powered electricity generation probabilistic forecasting and the acquisition of scatter diagram include Following steps:
Step S21, according to the historical forecast power of wind power plant in the predetermined amount of time of acquisition:
Obtain in moment t, the fluctuations in wind speed amount that wind power plant NWP predicts the outcome is:
Step S22, selects the fluctuations in wind speed amount fluc at the moment from t-s to t-1t-s,…,fluct-1The fluctuations in wind speed of composition Quantity set is combined into Fluct,s
Step S23, obtain byAnd Fluct,sBoth are mutually combined Descartes's collection of composition, as condition complete or collected works C, and Corresponding scatter diagram can be formed.
Condition complete or collected works, by K-means clustering algorithms, are divided into some condition subsets by step S30.
Condition complete or collected works C can be classified by K-means clustering algorithms, formation includes C1,C2,...,CmM bar Part subset.
K-means algorithms are the clustering algorithms based on distance, using evaluation index of the distance as similitude, that is, think two The distance of individual object is nearer, and its similarity is bigger.
Specifically, for condition complete or collected works C, using K-means clustering algorithms, being classified as m clusters, that is, it is classified as m mutually Disjoint condition subset:
M numerical value selection can be 4~10, selected according to different situations, should ensure that the element in each condition subset Number is more average, i.e. the number of element in each condition subset is essentially identical.
Step S40, to being in each condition subset CiUnder error set formation condition experience distribution, and examine its numeral Whether height is overlapped feature with numerical characteristic in the statistical nature of wind power plant predicated error;The return to step S30 if highly overlapping, Re-start cluster.
Specifically, in one of the embodiments, to each condition subset Ci, error sample under this condition can be obtained Collect Ei, the experience distribution PDF of wind power prediction error at different conditions can be obtainedi, described with this distribution in bar Part CiUnder error stochastic variable ei:
ei~PDFi
Whether the condition experience distribution of m error of one by one inspection is highly heavy with the error empirical distribution function in step S10 Close.So-called height is overlapped, and is that both numerical characteristic (average, variance, the degree of bias, kurtosis) differences are less than predetermined threshold value, this is preset Threshold value can be selected as needed, and predetermined threshold value is smaller, then numerical characteristic is more identical.
If highly overlapping, the condition difference information that error can not be distributed by illustrating this cluster is effectively peeled off.Need to return Step S30, the numerical value for changing m re-starts cluster, until the distribution of none of condition experience and wind power plant predicated error Statistical nature in experience distribution height overlap.
Step S50, with reference to the wind power prediction result formation wind power probabilistic forecasting result at each moment.
Specifically, in one of the embodiments, the acquisition of wind power probabilistic forecasting result includes:
Step S51, the wind power prediction result at moment t+k is obtained in tAnd moment t+k prediction of wind speed Undulate quantity fluct+k
Step S52, if this real number pairIn condition subset Cj, select the error of this condition subset Experience is distributed PDFj, by error stochastic variable ejIt is used as the error stochastic variable at the t+k moment;
Step S53, with reference to t+k wind power prediction resultForm final probabilistic forecasting result:
Wherein,It is the result of wind power probabilistic forecasting, is a stochastic variable, wind power can be described not Determine information.
Wind power probability forecasting method provided in an embodiment of the present invention, is calculated with conditional probability distribution and K-means clusters Based on method, error distribution function can be provided to otherness, with more preferable prediction effect.The wind power probabilistic forecasting side Method is modeled and analyzed by the predicated error to wind power, can be to the possible fluctuation range of wind power and probability point The description of overall picture is furnished with, so as to provide reliable, detailed information for wind power prediction result.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of wind power probabilistic forecasting device, due to this The principle that a little equipment solve problem is similar to a kind of wind power probability forecasting method, therefore the implementation of these equipment may refer to The implementation of method, repeats part and repeats no more.
The wind power probabilistic forecasting device can include:
Feature calculation module, for according to history power output and historical forecast power, obtaining wind power plant predicated error Statistical nature;
Condition computing module, for the fluctuations in wind speed amount predicted the outcome according to the NWP of historical forecast power and wind power plant, is obtained Obtain the condition complete or collected works of wind-powered electricity generation probabilistic forecasting;
Sort module, for by K-means clustering algorithms, condition complete or collected works to be divided into some condition subsets;
Cluster module, for being distributed to the error set formation condition experience being under each condition subset, and examines it Whether numerical characteristic overlaps with numerical characteristic in the statistical nature of wind power plant predicated error;Clustered if overlapping by K-means Algorithm is clustered again;
Prediction module, is distributed for the wind power prediction result according to each moment and condition experience, obtains wind-powered electricity generation work( Rate probabilistic forecasting result.
In implementation, the feature calculation module can include:
First acquisition unit, for obtaining the history power output of wind power plant within a predetermined period of time;
Second acquisition unit, the historical forecast power for obtaining wind power plant within a predetermined period of time;
First computing unit, for calculating the error in predetermined amount of time between history power output and historical forecast power Vector;
Second computing unit, for obtaining each component in error vector, constitutes wind power plant predicated error sample value, calculates The statistical nature of wind power plant predicated error.
In implementation, the condition computing module can include:
Undulate quantity acquiring unit, for the historical forecast power of wind power plant in the predetermined amount of time according to acquisition, is obtained During moment t, the fluctuations in wind speed amount that wind power plant NWP predicts the outcome;
Duration set acquiring unit is fluctuated, for obtaining the fluctuations in wind speed amount that the fluctuations in wind speed amount at the moment from t-s to t-1 is constituted Set;
Condition complete or collected works' acquiring unit, the Descartes constituted is mutually combined for obtaining by fluctuations in wind speed amount and the set Collection, is used as condition complete or collected works.
For convenience of description, each several part of apparatus described above is divided into various modules with function or unit is described respectively. Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program Product.Therefore, the application can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware Apply the form of example.Moreover, the application can be used in one or more computers for wherein including computer usable program code The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.) The form of product.
The application is the flow with reference to method, equipment (system) and computer program product according to the embodiment of the present application Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in individual square frame or multiple square frames.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

1. a kind of wind power probability forecasting method, it is characterised in that methods described includes:
According to history power output and historical forecast power, the statistical nature of wind power plant predicated error is obtained;
The fluctuations in wind speed amount predicted the outcome according to the numerical weather forecast NWP of historical forecast power and wind power plant, obtains wind-powered electricity generation general The condition complete or collected works of rate prediction;
By K-means clustering algorithms, condition complete or collected works are divided into some condition subsets;
Error set formation condition experience distribution to being under each condition subset, and examine its numerical characteristic and wind power plant pre- Survey whether numerical characteristic in the statistical nature of error overlaps;Clustered again by K-means clustering algorithms if overlapping;With And
It is distributed according to the wind power prediction result at each moment and condition experience, obtains wind power probabilistic forecasting result.
2. wind power probability forecasting method according to claim 1, it is characterised in that the wind power plant predicated error Statistical nature includes average E (X), variance Var (X), degree of bias Skew (X) and the kurtosis Kurtosis (X) of wind power plant predicated error.
3. wind power probability forecasting method according to claim 2, it is characterised in that described according to history power output And historical forecast power, obtain wind power plant predicated error statistical nature the step of include:
Obtain the history power output of wind power plant within a predetermined period of time;
Obtain the historical forecast power of wind power plant within a predetermined period of time;
Calculate the error vector between history power output and historical forecast power in predetermined amount of time;And
Each component in error vector is obtained, wind power plant predicated error sample value is constituted, calculates the statistics of wind power plant predicated error Feature.
4. wind power probability forecasting method according to claim 1, it is characterised in that described according to historical forecast power The fluctuations in wind speed amount predicted the outcome with the numerical weather forecast NWP of wind power plant, obtains the step of the condition complete or collected works of wind-powered electricity generation probabilistic forecasting Suddenly include:
According to the historical forecast power of wind power plant in the predetermined amount of time of acquisition, obtain in moment t, wind power plant NWP prediction knots The fluctuations in wind speed amount of fruit;
Obtain the fluctuations in wind speed duration set that the fluctuations in wind speed amount at the moment from t-s to t-1 is constituted;And
The Descartes's collection for being mutually combined and being constituted by fluctuations in wind speed amount and the set is obtained, condition complete or collected works are used as.
5. wind power probability forecasting method according to claim 1, it is characterised in that described to be clustered by K-means Algorithm, the step of condition complete or collected works are divided into some condition subsets includes:
For condition complete or collected works, using K-means clustering algorithms, m clusters are classified as, that is, are classified as m mutually disjoint conditions Subset, m numerical value is evenly distributed for the element number in 4~10, and each condition subset.
6. wind power probability forecasting method according to claim 5, it is characterised in that described pair is in each condition Error set formation condition experience distribution under collection, and examine its numerical characteristic and number in the statistical nature of wind power plant predicated error The step of whether word feature overlaps includes:
To each condition subset Ci, obtain error sample set E under this conditioni, the wind power obtained at different conditions is pre- Survey the experience distribution PDF of errori, and be distributed to describe in condition C with the experience of wind power prediction erroriUnder error it is random Variable ei:
ei~PDFi
The condition experience distribution of m error of one by one inspection, if with numerical characteristic in the statistical nature of wind power plant predicated error Error empirical distribution function is overlapped.
7. wind power probability forecasting method according to claim 1, it is characterised in that the wind-powered electricity generation according to each moment Power prediction result and the distribution of condition experience, the step of obtaining wind power probabilistic forecasting result include:
The wind power prediction result at moment t+k is obtained in tAnd moment t+k prediction of wind speed undulate quantity fluct+k
If real number to (fluct+k) it is in condition subset Cj, select the error experience distribution PDF of the condition subsetj, and will be by mistake Poor stochastic variable ejIt is used as the error stochastic variable at the t+k moment;
With reference to t+k wind power prediction resultObtain final probabilistic forecasting result:
<mrow> <msubsup> <mi>P</mi> <mrow> <mi>f</mi> <mo>,</mo> <mi>p</mi> </mrow> <mrow> <mi>t</mi> <mo>+</mo> <mi>k</mi> </mrow> </msubsup> <mo>=</mo> <msubsup> <mi>P</mi> <mi>f</mi> <mrow> <mi>t</mi> <mo>+</mo> <mi>k</mi> </mrow> </msubsup> <mo>+</mo> <msub> <mi>e</mi> <mi>j</mi> </msub> <mo>;</mo> </mrow>
Wherein,It is the result of wind power probabilistic forecasting, is stochastic variable, the uncertain information for describing wind power.
8. a kind of wind power probabilistic forecasting device, it is characterised in that described device includes:
Feature calculation module, for according to history power output and historical forecast power, obtaining the system of wind power plant predicated error Count feature;
Condition computing module, for the wind speed predicted the outcome according to the numerical weather forecast NWP of historical forecast power and wind power plant Undulate quantity, obtains the condition complete or collected works of wind-powered electricity generation probabilistic forecasting;
Sort module, for by K-means clustering algorithms, condition complete or collected works to be divided into some condition subsets;
Cluster module, for being distributed to the error set formation condition experience being under each condition subset, and examines its numeral Whether feature overlaps with numerical characteristic in the statistical nature of wind power plant predicated error;Pass through K-means clustering algorithms if overlapping Clustered again;
Prediction module, is distributed for the wind power prediction result according to each moment and condition experience, obtains wind power general Rate predicts the outcome.
9. wind power probabilistic forecasting device according to claim 8, it is characterised in that the feature calculation module bag Include:
First acquisition unit, for obtaining the history power output of wind power plant within a predetermined period of time;
Second acquisition unit, the historical forecast power for obtaining wind power plant within a predetermined period of time;
First computing unit, for calculate the error in predetermined amount of time between history power output and historical forecast power to Amount;
Second computing unit, for obtaining each component in error vector, constitutes wind power plant predicated error sample value, calculates wind-powered electricity generation The statistical nature of field prediction error.
10. wind power probabilistic forecasting device as claimed in claim 8, it is characterised in that the condition computing module includes:
Undulate quantity acquiring unit, for the historical forecast power of wind power plant in the predetermined amount of time according to acquisition, is obtained in moment t When, the fluctuations in wind speed amount that wind power plant NWP predicts the outcome;
Duration set acquiring unit is fluctuated, for obtaining the fluctuations in wind speed quantity set that the fluctuations in wind speed amount at the moment from t-s to t-1 is constituted Close;
Condition complete or collected works' acquiring unit, is mutually combined the Descartes constituted collection by fluctuations in wind speed amount and the set for obtaining, made For condition complete or collected works.
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CN108133279A (en) * 2017-08-29 2018-06-08 甘肃省电力公司风电技术中心 Wind power probability forecasting method, storage medium and equipment
CN108898251A (en) * 2018-06-29 2018-11-27 上海电力学院 Consider the marine wind electric field power forecasting method of meteorological similitude and power swing
CN109784563A (en) * 2019-01-18 2019-05-21 南方电网科学研究院有限责任公司 A kind of ultra-short term power forecasting method based on virtual anemometer tower technology
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