CN106936132A - A kind of multi-area Interconnected Power System STOCHASTIC CONTROL device for evaluating performance and method based on entropy - Google Patents

A kind of multi-area Interconnected Power System STOCHASTIC CONTROL device for evaluating performance and method based on entropy Download PDF

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Publication number
CN106936132A
CN106936132A CN201710248782.4A CN201710248782A CN106936132A CN 106936132 A CN106936132 A CN 106936132A CN 201710248782 A CN201710248782 A CN 201710248782A CN 106936132 A CN106936132 A CN 106936132A
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performance
entropy
power system
evaluating
area
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CN201710248782.4A
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CN106936132B (en
Inventor
孟庆伟
王艳松
钟振芳
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China University of Petroleum East China
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China University of Petroleum East China
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

Abstract

The invention discloses the random device for evaluating performance and method of a kind of multi-area Interconnected Power System based on minimal information entropy.The device includes data filter, entropy calculator, the part of indicia calculator three；The method includes the minute level average filter to area control error and frequency departure；The entropy of performance statistics is estimated；Three steps of performance Index Calculation.The random method of evaluating performance of multizone of the present invention system interconnecting electric power system is succinct and efficiently, on the normal operation of system without influence, and convenience of calculation, it is easy to apply.

Description

A kind of multi-area Interconnected Power System STOCHASTIC CONTROL device for evaluating performance based on entropy with Method
Technical field
The invention belongs to technical field of power systems, more particularly to power system frequency STOCHASTIC CONTROL device for evaluating performance and side Method.
Background technology
Regional power system interconnection is the citation form of current power system.The quality of regional power grid control performance is straight Connect the stabilization and reliability for being related to power network.Its control performance is also the foundation of regional power grid examination.Load fluctuation and with Under the very strong new energy double action of machine, interconnected electric power system shows stronger randomness, and its random performance evaluation turns into The main aspect of its Region control performance evaluation.
The content of the invention
The technical scheme is that a kind of random device for evaluating performance of multi-area Interconnected Power System based on entropy and side Method.
It is characterized in that the device include data filter, entropy calculator, the part of indicia calculator three, three parts are gone here and there successively Row connection.Wherein data filter exchanges deviation and frequency departure signal as input with the dominant eigenvalues of each control area, The minute level average filter value of area control error and frequency departure is obtained using average filter method, both filter values do and multiply Method obtains being worth as the output of data filter；It is input into as it using the output of data filter for entropy calculator, is used KERNEL FUNCTION METHOD is exported after calculating entropy；Indicia calculator is output as input with entropy calculator, carries out performance evaluation calculating, shows Show and export random Evaluation results.
The random method of evaluating performance of multi-area Interconnected Power System based on entropy is it is characterized in that the method includes three steps：
(1) to the minute level average filter of area control error and frequency departure
Area control error ACE and frequency deviation f is filtered and constructs new performance statistics according to minute level I-th element of Y, Y is calculated as follows：
Yi=mean (ACE)imin×mean(Δf)imin (1)
Wherein mean ()iminRepresent and the sampled value in variable i-th minute is averaging.
(2) entropy of performance statistics Y is estimated
Within the performance statistics cycle, the probability density function of statistic is estimated using KERNEL FUNCTION METHOD, and then estimate its entropy. The kernel function that the present invention is used is designated as κ (x) for gaussian kernel function, is specifically expressed as follows：
Wherein：X is the variable of any kernel function to be calculated.
Using the probability density value γ (Y of above-mentioned each statistic of kernel function estimationi) as follows：
Wherein N is the data amount check of Y, h=1.06 σ N-0.2, σ is the standard deviation of Y.
Estimate that the entropy of Y is as follows according to the definition of entropy with this：
(3) calculating of performance indications
The entropy of the performance statistics Y of each hour in performance evaluation cycle is calculated, the note entropy of i-th hour is H (Y)ihour, then with the entropy H of the performance statistics Y of whole year upper one yearLMake comparisons, the performance indications of i-th hour can be obtained
What long-term random Performance Evaluating Indexes CPS_H was defined as follows：
CPS_H=(2-avg (CH)T)×100 (6)
Wherein：avg(CH)TExpression is averaging in each hour performance indications CH in performance evaluation time T.If CPS_H ＞ 100 think that the random performance of multi-area Interconnected Power System is qualified.
Brief description of the drawings
Fig. 1：10 hours frequency departures and area control error
Fig. 2：Performance statistics
Specific embodiment
With reference to invention book content, preferred embodiment is briefly described.It is emphasized that the description below is only example Property, rather than in order to limit the scope of the present invention and its application.
In order to illustrate the convenience of the implementation of the inventive method, by the evaluation of the random performance of certain regional power system when 10 hours of Duan Xuanwei, generally take in practice 1 month or 1 year.Example of the invention selects certain interconnected electric power system Zhong-1 block Domain is random performance evaluation object, and the statistic entropy for calculating a year thereon is -10.2.If accompanying drawing 1 is certain interconnected electric power system The frequency departure and area control error in Zhong-1 block domain.Definition according to area control error ACE calculates ACE, more actual ACE signals can be obtained directly from data acquisition analysis system in system.
ACE and frequency departure are calculated into performance statistics Y according to formula (1), as shown in Figure 2.
Calculate the entropy of Y of calculating in each hour.The entropy for calculating specific each hour using KERNEL FUNCTION METHOD is as follows：
-10.80 -10.88 -10.42 -10.44 -11.23
-10.18 -10.33 -10.79 -9.89 -10.45
Entropy in each hour is taken do exponent arithmetic must be worth it is as follows：
2.04×10-5 1.88×10-5 2.98×10-5 2.92×10-5 1.33×10-5
3.79×10-5 3.26×10-5 2.05×10-5 5.08×10-5 2.93×10-5
It is as follows the index of each hour to be calculated according to formula (5)：
0.5498 0.5058 0.8011 0.7859 0.3582
1.0185 0.8765 0.5522 1.3655 0.7880
Calculating 10 hours region STOCHASTIC CONTROL performance indications according to formula (6) is：
123.9>100
Illustrate that the region STOCHASTIC CONTROL performance is qualified.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims It is defined.

Claims (5)

1. a kind of multi-area Interconnected Power System STOCHASTIC CONTROL device for evaluating performance based on entropy, it is characterised in that the device bag Include data filter, entropy calculator, the part of indicia calculator three, three parts are connected in series successively.
2. a kind of method of evaluating performance of utilization claim 1 described device, it is characterised in that the method is comprised the following steps：
1) to the minute level average filter of area control error and frequency departure；
2) entropy of performance statistics Y is estimated；
3) calculating of performance indications.
3. area control error and frequency departure described in a kind of utilization claim 2 minute level average filter method, its feature It is that the method solves i-th element of performance statistics Y by following formula：
Yi=mean (ACE)imin×mean(Δf)imin
Wherein mean ()iminRepresent and the sampled value in variable i-th minute is averaging, ACE is area control error and Δ f is Frequency departure.
4. a kind of calculating of performance indications described in claim 2, it is characterised in that the performance indications CH of i-th houriBy following formula Calculate：
Wherein H (Y)ihourIt is the entropy of i-th hour, HLIt was the entropy of the performance statistics of whole year upper one year.
5. a kind of Performance Evaluating Indexes described in claim 2, the long-term random Performance Evaluating Indexes CPS_H of definition is as follows：
CPS_H=(2-avg (CH)T)×100
Wherein：avg(CH)TRepresent that each hour performance indications CH in performance evaluation time T is averaging, as CPS_H ＞ 100 Think that the random performance of multi-area Interconnected Power System is qualified.
CN201710248782.4A 2017-04-17 2017-04-17 A kind of multi-area Interconnected Power System STOCHASTIC CONTROL device for evaluating performance and method based on entropy Expired - Fee Related CN106936132B (en)

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Cited By (1)

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CN103259274A (en) * 2013-04-18 2013-08-21 华中科技大学 Multi-area interconnected power network ultra-high voltage tie line power control method and controller
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