CN109378817A - One kind being based on primary frequency modulation method for estimating stability - Google Patents
One kind being based on primary frequency modulation method for estimating stability Download PDFInfo
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- CN109378817A CN109378817A CN201811239378.1A CN201811239378A CN109378817A CN 109378817 A CN109378817 A CN 109378817A CN 201811239378 A CN201811239378 A CN 201811239378A CN 109378817 A CN109378817 A CN 109378817A
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- frequency modulation
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- primary frequency
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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
Abstract
The present invention relates to one kind to be based on primary frequency modulation method for estimating stability, and the evaluation result of primary frequency modulation performance factor and momentary speed variation is obtained by calculation.In the present invention, the statistics of primary frequency modulation performance factor makes up the deficiency of previous frequency modulation characteristic analysis indexes；Mains frequency is calculated using turbine speed, is a kind of method of Quick Acquisition mains frequency, can be changed in shortest time induction frequencies；Acquisition data can be handled in time, provide reference for post analysis unit frequency modulation performance by the statistics of momentary speed variation；It is calculating among electricity contribution methods, using the difference of active power and load instruction, is reducing because AGC adjusts influence of the variation to primary frequency modulation, it is scientific and reasonable to avoid contradiction, improve the authenticity of frequency modulation contributing electricity；In order to avoid frequently calculating, according to previous unit frequency modulation characteristic, unit frequency modulation characteristic can fully demonstrate after 10s, so the reasonability of statistical data can be improved in setting evaluation Period Length.
Description
Technical field
The invention belongs to frequency modulation estimation of stability technical fields, are based on primary frequency modulation estimation of stability more particularly, to one kind
Method.
Background technique
As load growth and power grid scale increasingly increase, extra-high voltage grid and interconnection power system under the new situation,
Unit primary frequency function can be obviously improved frequency quality of power grid with the mutation of quick response grid power, pacify in power grid
Very important effect is played in full stable operation.Current primary frequency modulation estimation of stability is tired because of data acquisition and data analysis
It is difficult heavy, it needs to establish data analysis system, so not carrying out correlated performance analysis work, primary frequency modulation analysis and summary master at present
To report by each frequency regulation power plant data, then carry out data analysis, carried out after uniformly summarizing the analysis of bulk power grid primary frequency modulation with
It summarizes, wherein data collection phase can delay valuable time, miss the opportunity of optimized analysis data, and data are analyzed or with master
Sight factor, causes many difficulties for primary frequency modulation analysis, proposes that one kind is based on primary frequency modulation method for estimating stability based on this,
Significant data is provided for scientific analysis generating set frequency modulation stability.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide the data-handling capacities powerful using control system
Come solve previous frequcny modulation data is not perfect, use historical storage mode and search function for further research frequency modulation characteristic provide according to
According to one kind be based on primary frequency modulation method for estimating stability.
Specific technical solution of the present invention is as follows:
One kind being based on primary frequency modulation method for estimating stability, it is characterised in that: the following steps are included:
(1) the grid-connected power generator turbine revolving speed of timing acquiring, is converted to mains frequency for revolving speed；
(2) the deviation of mains frequency and standard frequency is calculated, and result is subjected to signed magnitude arithmetic(al)；
(3) when absolute value of the bias is greater than the set value, then next step is entered；
Otherwise, step is returned to (1)；
(4) when absolute value of the bias is reduced to setting value, this Phase Evaluation terminates, minute book phases-time length；Otherwise, after
Continuous timing；
(5) when time span is greater than 10 seconds, the data of this phase acquisition are analyzed, obtain evaluation number；
When time span is less than or equal to 10 seconds, step is returned to (1)；
Setting value is 0.034Hz；
Turbine speed w is converted to mains frequency f:f=w/60；
Mains frequency f and standard frequency f0 absolute value of the bias: Δ f=∣ f-f0 ∣；
Time span h: stop from absolute value of the bias Δ f is greater than the 0.034Hz moment to less than equal to the 0.034Hz moment；
Sampling time interval h0: the minimum sampling period of control system or analysis system；
Number of samples n:n=h/h0；
Electricity contributes deviation: Δ p=p-p0；
Electricity contributes peak value: Δ pm=max ∣ Δ p ∣；
Electricity contribution amount W calculation method: W=3600*1000* Σ Δ p/n；
Unit rated power is pe, unit MW；
When mains frequency is greater than standard frequency:
When electricity contribution amount is negative, the correct action frequency k1 of meter primary frequency modulation increases by 1 time, primary frequency modulation malfunction time
Number k2 is constant；When electricity contribution amount is positive number, k1 is constant, and k2 increases primary；
When mains frequency is less than standard frequency:
When electricity contribution amount is positive number, k1 increases by 1 time, and k2 is constant；When electricity contribution amount is negative, k1 is constant, and k2 increases
Once；
Primary frequency modulation performance factor A:A=k1/ (k1+k2)；
Momentary speed variation δ: δ=pe* Δ f/ (f0* Δ pm).
The advantages of the present invention are:
In the present invention, manpower money is reduced using the powerful data-handling capacity of control system by method for estimating stability
Source consumption, it is not perfect to solve previous frequcny modulation data, using historical storage mode, can use search function, for further research
Frequency modulation characteristic provides foundation；The statistics of primary frequency modulation performance factor makes up the deficiency of previous frequency modulation characteristic analysis indexes；Using
Turbine speed calculates mains frequency, is a kind of method of Quick Acquisition mains frequency, can be in shortest time induction frequencies
Variation；Acquisition data can be handled in time, provide ginseng for post analysis unit frequency modulation performance by the statistics of momentary speed variation
It examines；It is calculating among electricity contribution methods, using the difference of active power and load instruction, is reducing because AGC adjusts variation to one
The influence of secondary frequency modulation, it is scientific and reasonable to avoid contradiction, improve the authenticity of frequency modulation contributing electricity；In order to avoid frequently calculating, according to
Previous unit frequency modulation characteristic, unit frequency modulation characteristic can fully demonstrate after 10s, so setting evaluation Period Length can mention
The reasonability of high statistical data.
Detailed description of the invention
Fig. 1 is the example plot of each data.
Specific embodiment
The present invention is described in further detail by following embodiment, but the technology contents that are described of the present embodiment be it is illustrative,
Without being restrictive, protection scope of the present invention should not be limited to according to this.
One kind being based on primary frequency modulation method for estimating stability, and innovation of the invention is: the following steps are included:
(1) the grid-connected power generator turbine revolving speed of timing acquiring, is converted to mains frequency for revolving speed；
(2) the deviation of mains frequency and standard frequency is calculated, and result is subjected to signed magnitude arithmetic(al)；
(3) when absolute value of the bias is greater than the set value, then next step is entered；
Otherwise, step is returned to (1)；
(4) when absolute value of the bias is reduced to setting value, this Phase Evaluation terminates, minute book phases-time length；Otherwise, after
Continuous timing；
(5) when time span is greater than 10 seconds, the data for analyzing this phase acquisition are (including data sampling time interval h0, active
Power p, power instruction p0 etc.), obtain evaluation number (momentary speed variation δ, electricity contribution amount W, primary frequency modulation performance factor A
Deng)；
When time span is less than or equal to 10 seconds, step is returned to (1)；
Setting value is 0.034Hz；
Turbine speed w is converted to mains frequency f:f=w/60；
Mains frequency f and standard frequency f0 absolute value of the bias: Δ f=∣ f-f0 ∣；
Time span h: stop from absolute value of the bias Δ f is greater than the 0.034Hz moment to less than equal to the 0.034Hz moment；
Sampling time interval h0: the minimum sampling period of control system or analysis system；Number of samples n:n=h/h0；
Electricity contributes deviation: Δ p=p-p0；Electricity contributes peak value: Δ pm=max ∣ Δ p ∣；
Electricity contribution amount W calculation method: W=3600*1000* Σ Δ p/n；
Unit rated power is pe, unit MW；
When mains frequency is greater than standard frequency:
When electricity contribution amount is negative, the correct action frequency k1 of meter primary frequency modulation increases by 1 time, primary frequency modulation malfunction time
Number k2 is constant；When electricity contribution amount is positive number, k1 is constant, and k2 increases primary；
When mains frequency is less than standard frequency:
When electricity contribution amount is positive number, k1 increases by 1 time, and k2 is constant；When electricity contribution amount is negative, k1 is constant, and k2 increases
Once；
Primary frequency modulation performance factor A:A=k1/ (k1+k2)；
Momentary speed variation δ: δ=pe* Δ f/ (f0* Δ pm).
In the present invention, manpower money is reduced using the powerful data-handling capacity of control system by method for estimating stability
Source consumption, it is not perfect to solve previous frequcny modulation data, using historical storage mode, can use search function, for further research
Frequency modulation characteristic provides foundation；The statistics of primary frequency modulation performance factor makes up the deficiency of previous frequency modulation characteristic analysis indexes；Using
Turbine speed calculates mains frequency, is a kind of method of Quick Acquisition mains frequency, can be in shortest time induction frequencies
Variation；Acquisition data can be handled in time, provide ginseng for post analysis unit frequency modulation performance by the statistics of momentary speed variation
It examines；It is calculating among electricity contribution methods, using the difference of active power and load instruction, is reducing because AGC adjusts variation to one
The influence of secondary frequency modulation, it is scientific and reasonable to avoid contradiction, improve the authenticity of frequency modulation contributing electricity；In order to avoid frequently calculating, according to
Previous unit frequency modulation characteristic, unit frequency modulation characteristic can fully demonstrate after 10s, so setting evaluation Period Length can mention
The reasonability of high statistical data.
Claims (1)
1. one kind is based on primary frequency modulation method for estimating stability, it is characterised in that: the following steps are included:
(1) the grid-connected power generator turbine revolving speed of timing acquiring, is converted to mains frequency for revolving speed；
(2) the deviation of mains frequency and standard frequency is calculated, and result is subjected to signed magnitude arithmetic(al)；
(3) when absolute value of the bias is greater than the set value, then next step is entered；
Otherwise, step is returned to (1)；
(4) when absolute value of the bias is reduced to setting value, this Phase Evaluation terminates, minute book phases-time length；Otherwise, continue to count
When；
(5) when time span is greater than 10 seconds, the data of this phase acquisition are analyzed, obtain evaluation number；
When time span is less than or equal to 10 seconds, step is returned to (1)；
Setting value is 0.034Hz；
Turbine speed w is converted to mains frequency f:f=w/60；
Mains frequency f and standard frequency f0 absolute value of the bias: Δ f=∣ f-f0 ∣；
Time span h: stop from absolute value of the bias Δ f is greater than the 0.034Hz moment to less than equal to the 0.034Hz moment；
Sampling time interval h0: the minimum sampling period of control system or analysis system；
Number of samples n:n=h/h0；
Electricity contributes deviation: Δ p=p-p0；
Electricity contributes peak value: Δ pm=max ∣ Δ p ∣；
Electricity contribution amount W calculation method: W=3600*1000* Σ Δ p/n；
Unit rated power is pe, unit MW；
When mains frequency is greater than standard frequency:
When electricity contribution amount is negative, the correct action frequency k1 of meter primary frequency modulation increases by 1 time, primary frequency modulation malfunction number k2
It is constant；When electricity contribution amount is positive number, k1 is constant, and k2 increases primary；
When mains frequency is less than standard frequency:
When electricity contribution amount is positive number, k1 increases by 1 time, and k2 is constant；When electricity contribution amount is negative, k1 is constant, and k2 increases primary；
Primary frequency modulation performance factor A:A=k1/ (k1+k2)；
Momentary speed variation δ: δ=pe* Δ f/ (f0* Δ pm).
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| CN110429669A (en) * | 2019-07-30 | 2019-11-08 | 清华大学 | A kind of main website side control method for frequency of AGC and primary frequency modulation coordination |
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