CN1295859C - Method for measuring modulation efficiency of generating set primary frequency-modulation - Google Patents

Abstract

The present invention relates to a method for measuring modulation efficiency of generating set primary frequency modulation, which is used for measuring modulation efficiency of primary frequency modulation of a generating set with automatic power generation control. When no secondary frequency modulation occurs, needed data is measured for calculating the modulation index number, the modulation electric quantity and the deviation electric quantity of the generating set. The modulation efficiency of the primary frequency modulation of the generating set can be accurately and comprehensively evaluated according to the aggregative indicators. Because the influence of the secondary frequency modulation is removed and the interference of the small disturbance of the frequency of an electric network is reduced, the measuring result of the present invention is more accurate than the prior art.

Description

Generating set primary frequency regulation regulation efficiency assay method

Technical field

The present invention relates to a kind of generating set regulation efficiency assay method, relate in particular to the assay method of generating set primary frequency regulation regulation efficiency.Be specially adapted to the to have automatic generation control electricity generation system of (abbreviating AGC-AutomaticGeneration Control as).

Background technology

Modern power network has developed into the interconnected systems that many control areas constitute, distributes and improve the whole economic efficiency of electrical network rationally with the energy resources in realizing on a large scale.In order to make power system security, high-quality, operation economically, each regional dispatching of power netwoks control centre adopts the main means of automatic generation control (AGC) as interconnected systems power and FREQUENCY CONTROL usually.

At present, the pattern of the automatic generation control of regional power grid dispatching control center mainly adopts interconnection and frequency departure control.Basic principle is under the prerequisite that guarantees the system frequency quality, exchanges power planning between execution area.Each zone is responsible for handling the load disturbance that the one's respective area took place, and in case of emergency, gives adjacent area with provisional support.

One of main task of power system operation monitors frequency exactly and controls, and the primary frequency modulation function of generating set is most important to keeping stablizing of mains frequency.Therefore, all significant for the real-time monitoring and the effect measuring of generating set primary frequency regulation function.

The primary frequency modulation of said generating set is meant that when the mains frequency offrating increase of generating set regulation and control system robot brain group active power (when frequency descends) or minimizing (when frequency raises) are with the characteristic of restriction mains frequency variation.The generating set primary frequency regulation ability is meant the size that changes the meritorious amount of unit in the unit interval.What meritorious amount changed in the unit interval is big more, and then the stabilization to mains frequency is big more, but the generating set poor stability; Otherwise, more little to the mains frequency stabilization, but the generating set good stability.

In the prior art, inventor Li Duan is super, Chen Shi etc. provides a kind of " generating set primary frequency regulation regulation efficiency The real time measure and compensation method " (referring to " Automation of Electric Systems " 2004,28 (2): 70-72), this method is examined from the angle of rate of coming into operation and electric weight.Add up the state that comes into operation and the electric weight of primary frequency modulation respectively.The basis of electric weight when system frequency deviation surpass regulation scope (± 0.03Hz) begin to start, directly with actual power power P at that time ₀Be basic point, integration generating variable quantity returns in the generating set operating dead zone until system frequency backward.The place of this method deficiency is that the parameter that it measures is less, the state that comes into operation of the primary frequency modulation that it is measured, and in fact setting that can be artificial does not have the meaning of what examination.Equal only to measure the parameter of an electric weight.In addition, in the calculating of electric weight, this method does not consider that minute level of automatic generation control postpones, and often the result with frequency modulation frequency modulation brings in the evaluation result, has influenced the precision of primary frequency modulation measurement result.

Summary of the invention

Purpose of the present invention is in order to overcome above-mentioned deficiency of the prior art, a kind of assay method of generating set primary frequency regulation regulation efficiency is provided, give grid dispatching center, the generating set that possesses automatic generation control (AGC) function is carried out primary frequency modulation usefulness examine evaluating method more accurately.

For achieving the above object, the technical solution used in the present invention is: at first to generating set with automatic generation control under the unregulated state of automatic generation control (AGC), just when no frequency modulation frequency modulation occurs, gather that generating set is actually exerted oneself, automatic generation control (AGC) is exerted oneself and mains frequency; Regulate index, regulate electric weight and deviation electric weight according to the calculation of parameter of gathering; With the regulation efficiency of the primary frequency modulation of the result of calculation Comprehensive Assessment generating set of three indexs, and deposit result of calculation in database, in order to calling at any time.

The adjusting index of said generating set is to compare by the practical adjustments power of generating set and setup parameter, considers current mains frequency simultaneously.Provide the adjusting index of generating set with the form of percentage.An adjustable range of general generating set is 4%～6% of a rated power, regulates index and weeds out little frequency jitter.With the sky is an evaluation and test unit, the COMPREHENSIVE CALCULATING adjusting function.Perfect condition is 100%.

Said adjusting electric weight is to carry out integration (in the evaluation and test period) by the adjusting power to generating set, and the primary frequency modulation that obtains generating set is regulated electric weight.

Said deviation electric weight be by practical adjustments electric weight and generating set setup parameter the adjusting electricity ratio, obtain generating set deviation electric weight.

Assay method beneficial effect of the present invention is significant.

The index that assay method of the present invention is evaluated and tested is more than prior art, comprises the adjusting index of generating set, the composite target of regulating electric weight and deviation electric weight, and these indexs more can reflect the regulation efficiency of the primary frequency modulation of generating set definitely comprehensively.

Assay method of the present invention has been rejected the influence of frequency modulation frequency modulation, and has been reduced the interference of mains frequency microvariations by to measuring and the choosing of acquisition time section.Therefore, the result of assay method of the present invention is more accurate.The present invention provides a kind of effective ways of examining the generating set primary frequency regulation regulatory function to grid control centre.

Description of drawings

Fig. 1 is the flow chart of assay method of the present invention.

Embodiment

Further specify assay method of the present invention below:

According to above-mentioned technical scheme, as carrier, use the C language with computer, the concrete determination step of setting up assay method of the present invention on Microsoft's Window (Windows) operating system is:

＜1〉image data: the generating set with automatic generation control is gathered, when the given instruction of electrical network is stablized, postpone to begin image data after 10 minutes or 20 minutes, get that concerned power generation unit is actually exerted oneself, automatic generation control (AGC) is exerted oneself and the data of mains frequency per 3 seconds, when the given instruction of electrical network changes, stop to gather; The data of being gathered are as shown in table 1 in the present embodiment.The collection of said automatic generation control (AGC) is the standard that enters image data and calculation interval as judgement.

＜2〉calculate the adjusting index, regulate electric weight and deviation electric weight according to the data of above-mentioned collection: regulate index R _PerFor:

$R_{\mathrm{per}}=(1-\frac{\underset{n}{\mathrm{\Σ}}{\stackrel{\‾}{\mathrm{\ΔP}}}_{\min }*{\stackrel{\‾}{\mathrm{\Δf}}}_{\min }}{-20B*n*{\mathrm{\ϵ}}^2})*100\%$

Wherein: ${\stackrel{\‾}{\mathrm{\ΔP}}}_{\min }=\frac{1}{t_2-t_1}\underset{t_1}{\overset{t_2}{\mathrm{\Σ}}}\left|{\stackrel{\‾}{\mathrm{\ΔP}}}_i\right|$

${\stackrel{\‾}{\mathrm{\Δf}}}_{\min }=\frac{1}{t_2-t_1}\underset{t_1}{\overset{t_2}{\mathrm{\Σ}}}\left|{\stackrel{\‾}{\mathrm{\Δf}}}_i\right|$

$\stackrel{\‾}{{\mathrm{\Δf}}_i}=\frac{\stackrel{\‾}{\mathrm{\Δ}{P}_i}}{-10B}+{\mathrm{\Δf}}_i$

$\stackrel{\&OverBar;}{{\mathrm{\&Delta;P}}_i}=\left\{\begin{array}{cc}{\mathrm{\&Delta;P}}_i& {\mathrm{\&Delta;P}}_i<{\mathrm{\&Delta;P}}_m\\ {\mathrm{\&Delta;P}}_m& {\mathrm{\&Delta;P}}_i\&GreaterEqual;{\mathrm{\&Delta;P}}_m\end{array}\right.$

ΔP _i＝P _r-P _s

${\mathrm{\&Delta;f}}_i=\left\{\begin{array}{cc}{f}_r-50.033& f_r>50.033\\ 49.967-f_r& f_r<49.967\\ 0& 49.967\&GreaterEqual;f_r\&GreaterEqual;50.033\end{array}\right.$

The adjusting electric weight is:

RegMW＝∑sign*(P _r-P _avg)

The deviation electric weight is:

DiffMW＝∑sign*(P _r-P _s)

In the above-mentioned formula

P _rP _sP _Avg: generating set is actual exerts oneself, and generating set is regulated with the given benchmark of frequency change and exerted oneself, and enters the preceding actual mean value of exerting oneself of generating set of evaluation and test.

Δ P _iΔ P _iΔ P _Min: unit is regulated the deviation of exerting oneself, the offset correction of exerting oneself, the one-minute average deviation of exerting oneself

Δ f _iΔ f _iΔ f _Min: the mains frequency deviation, frequency departure is proofreaied and correct, the one-minute average frequency departure.f _r-mains frequency,

t ₁-be one-minute average t zero-computing time ₂-be that one-minute average calculates the termination time

B: primary frequency modulation is regulated slope

N: calculate the number of minutes

ε: frequency statistics variance, value 0.035 usually

＜3〉evaluate and test the regulation efficiency of the generating set primary frequency regulation of surveying with the data of first step collection and three index results that formula calculated in second step, and deposit the data of calculating in database, prepare against and call at any time.

In the present embodiment, the result of the adjusting index of calculating gained, adjusting electric weight and three indexs of deviation electric weight is as shown in table 2.In the present embodiment, database includes three partial datas: the data of historical real data, generator 's parameter and aforementioned calculation.

The data of table 1 for the generating set with automatic generation control is gathered

Time	The actual Pr that exerts oneself of generating set (MW)	Automatic generation control (AGC) exert oneself (MW)	Mains frequency f r (Hz)
				…….	…….	…….	……..
2003-10-03 19:57:00	500.150208	449.39502	49.963001
				2003-10-03 19:57:03	500.150208	449.39502	49.959
2003-10-03 19:57:06	500.150208	449.39502	49.965
				2003-10-03 19:57:09	500.573181	449.39502	49.971001
2003-10-03 19:57:12	500.573181	449.39502	49.977001
				2003-10-03 19:57:15	500.573181	449.39502	49.973
2003-10-03 19:57:18	500.573181	449.39502	49.966
				2003-10-03 19:57:21	500.573181	449.39502	49.959999
2003-10-03 19:57:24	500.573181	449.39502	49.966
				2003-10-03 19:57:27	500.573181	449.39502	49.970001
2003-10-03 19:57:30	497.612457	449.39502	49.967999
				2003-10-03 19:57:33	497.612457	449.39502	49.964001
2003-10-03 19:57:36	497.612457	449.39502	49.958
				2003-10-03 19:57:39	497.612457	449.39502	49.960999
2003-10-03 19:57:42	497.612457	449.39502	49.969002
				2003-10-03 19:57:45	497.612457	449.39502	49.969002
2003-10-03 19:57:48	497.612457	449.39502	49.962002
				2003-10-03 19:57:51	496.555054	449.39502	49.960999
2003-10-03 19:57:54	496.555054	449.39502	49.960999
				2003-10-03 19:57:57	496.555054	449.39502	49.965
2003-10-03 19:58:00	496.555054	449.39502	49.985001
				2003-10-03 19:58:03	497.612457	449.39502	49.986
2003-10-03 19:58:06	497.612457	449.39502	49.984001
				2003-10-03 19:58:09	496.132111	449.39502	49.987
2003-10-03 19:58:12	496.132111	449.39502	49.987999
				2003-10-03 19:58:15	496.132111	449.39502	49.986
2003-10-03 19:58:18	496.132111	449.39502	49.990002
				2003-10-03 19:58:21	497.189484	449.39502	49.990002
2003-10-03 19:58:24	497.189484	449.39502	49.993
				2003-10-03 19:58:27	497.189484	449.39502	50
……	……	……	……

Table 2 table 1 and above-mentioned formula result calculated

Index name	Desired value
		Regulate index R per	38.68％
Regulate electric weight R egMW	196.62(MW)
		Deviation electric weight D iffMW	-543.97(MW)

Claims (1)

1, a kind of generating set primary frequency regulation regulation efficiency assay method is the mensuration of carrying out the regulation efficiency of primary frequency modulation for the generating set with automatic generation control, it is characterized in that under the unregulated state of automatic generation control, and concrete determination step is:

＜the first step〉image data: the generating set with automatic generation control is gathered, when the given instruction of electrical network is stablized, postpone to begin after 10 minutes or 20 minutes to gather, get that concerned power generation unit is actually exerted oneself, automatic generation control is exerted oneself and the data of mains frequency per 3 seconds, when the given instruction of electrical network changes, stop to gather;

＜the second step〉exert oneself and the mains frequency data are calculated and regulated index, regulate electric weight and deviation electric weight according to the generating set of gathering:

The adjusting index is:

$R_{\mathrm{per}}=(1-\frac{\underset{n}{\mathrm{\&Sigma;}}{\stackrel{\&OverBar;}{\mathrm{\&Delta;P}}}_{\min }*{\stackrel{\&OverBar;}{\mathrm{\&Delta;f}}}_{\min }}{-20B*n*{\mathrm{\&epsiv;}}^2})*100\%$

Wherein: ${\stackrel{\&OverBar;}{\mathrm{\&Delta;P}}}_{\min }=\frac{1}{t_2-t_1}\underset{t_1}{\overset{t_2}{\mathrm{\&Sigma;}}}\left|{\stackrel{\&OverBar;}{\mathrm{\&Delta;P}}}_i\right|$

${\stackrel{\&OverBar;}{\mathrm{\&Delta;f}}}_{\min }=\frac{1}{t_2-t_1}\underset{t_1}{\overset{t_2}{\mathrm{\&Sigma;}}}\left|{\stackrel{\&OverBar;}{\mathrm{\&Delta;f}}}_i\right|$

$\stackrel{\&OverBar;}{{\mathrm{\&Delta;f}}_i}=\frac{\stackrel{\&OverBar;}{{\mathrm{\&Delta;P}}_i}}{-10B}+{\mathrm{\&Delta;f}}_i$

$\stackrel{\&OverBar;}{{\mathrm{\&Delta;P}}_i}=\left\{\begin{array}{cc}{\mathrm{\&Delta;P}}_i& {\mathrm{\&Delta;P}}_i<{\mathrm{\&Delta;P}}_m\\ {\mathrm{\&Delta;P}}_m& {\mathrm{\&Delta;P}}_i\&GreaterEqual;{\mathrm{\&Delta;P}}_m\end{array}\right.$

ΔP _i＝P _r-P _s

${\mathrm{\&Delta;f}}_i=\left\{\begin{array}{cc}{f}_r-50.033& f_r>50.033\\ 49.967-f_r& f_r<49.967\\ 0& 49.967\&GreaterEqual;f_r\&GreaterEqual;50.033\end{array}\right.$

The adjusting electric weight is:

RegMW＝∑sign*(P _r-P _avg)

The deviation electric weight is:

DiffMW＝∑sign*(P _r-P _s)

In the above-mentioned formula

P _rP _sP _Avg: generating set is actual exerts oneself, and generating set is regulated with the given benchmark of frequency change and exerted oneself, and enters the preceding actual mean value of exerting oneself of generating set of evaluation and test,

Δ P _iΔ P _iΔ P _Min: unit is regulated the deviation of exerting oneself, the offset correction of exerting oneself, the one-minute average deviation of exerting oneself

Δ f _iΔ f _iΔ f _Min: the mains frequency deviation, frequency departure is proofreaied and correct, the one-minute average frequency departure; f _r-mains frequency, t ₁-be one-minute average zero-computing time, t ₂-for one-minute average calculates the termination time, B: primary frequency modulation is regulated slope, n: calculate the number of minutes

ε: frequency statistics variance, value 0.035 usually

＜the three step〉evaluate the regulation efficiency of the generating set primary frequency regulation of being measured with the data of first step collection and the formula institute result calculated in second step, and deposit result calculated in database.