CN102323550A - Primary frequency modulation adjusting performance determination method of generating set - Google Patents

Abstract

The invention discloses a primary frequency modulation adjusting performance determination method of a generating set, and determination of primary frequency modulation adjusting performance is carried out on the generating set with automatic generating control. An improved additional weight integration electric quantity algorithm is provided in the invention, according to real contribution degree of primary frequency modulation to an electrical network, different weight coefficients are employed to carry out integration contribution electric quantity calculation on different frequency differences or time quanta in large and small frequency disturbances, thus primary frequency modulation motions of different generating sets can be distinguished scientifically, a correct rate and contribution electric quantity of the primary frequency modulation motion can be taken into consideration comprehensively to calculate deserved primary frequency modulation economy compensation, and through carrying out verification with real-time measurement data, the novel performance determination method is completely operable. An instance in the invention shows that the additional weight integration electric quantity algorithm has rationality compared with a common integration electric quantity algorithm.

Description

Generating set primary frequency regulation adjusting function assay method

[technical field]

The present invention relates to a kind of genset adjusting function assay method, particularly a kind of generating set primary frequency regulation adjusting function assay method.

[background technology]

Primary frequency modulation is meant that when power system frequency departs from objectives genset is through the automatic reaction of governing system, and meritorious the exerting oneself of adjustment reduced the service that frequency departure provided, and belongs to the basic assistant service in the assistant service.The primary frequency modulation function of genset is an important technique measure of systems stabilisation frequency, for realizing that grid generation dispatches, improves the quality of power supply automatically, keeps power network safety operation and can play an important role.

The primary frequency modulation function is meant that when the network system frequency exceeds regions the automatic control system of the unit that generates electricity by way of merging two or more grid systems increases or reduce the active power of unit, thereby significantly a kind of function of variation takes place the restriction mains frequency.The primary frequency modulation ability of corresponding unit is meant the size that changes unit active power in the unit interval, mainly by load change speed, artificial dead band, momentary speed variation, dead-band decision.

The primary frequency modulation ability of unit is with the type of unit; The design logic of automatic control module, the parameter setting of control system, the throwing of concrete function stop waiting has much relations; The unit primary frequency modulation particularly primary frequency modulation ability of fired power generating unit is also relevant with the real-time operation conditions of unit; Like the amount of stored heat of boiler the fm capacity of unit at that time just there is very big influence, the unit that amount of stored heat is big, the ability of primary frequency modulation is just strong.The size of unit primary frequency modulation ability can not use a certain secondary data to weigh; Because the acting characteristic of unit primary frequency modulation has very big dynamic perfromance; With the steady state test result bigger gap is arranged, so must use primary frequency modulation function that long real time data reflects the unit input to stablizing the contribution that the electrical network system frequency is made.

There is following problem in existing assay method: the real time data of artificial dead band, momentary speed variation, the peak load amplitude of accommodation, dead-band, respondent behavior is measured relatively difficulty; Whether existing assay method just reaches technical indicator based on the examination item; Measure just towards the result; Can not intactly write down the running status during unit is participated in primary frequency modulation, and it is low to measure precision.

[summary of the invention]

The object of the present invention is to provide a kind of generating set primary frequency regulation adjusting function assay method, not enough to solve prior art; It is high that it measures precision, can react the actual contribution size of unit to mains frequency accurately.

To achieve these goals, the present invention adopts following technical scheme:

A kind of generating set primary frequency regulation adjusting function assay method is the mensuration of carrying out the adjusting function of primary frequency modulation for the genset with Automatic Generation Control, may further comprise the steps:

1), image data: gather mains frequency, have the actual AGC status data of exerting oneself, having the genset of Automatic Generation Control of the genset of Automatic Generation Control;

2) data of the above-mentioned collection of foundation are used the contribution electric weight algorithm computation primary frequency modulation integration electric weight of additional weight:

Computing formula during big disturbance is:

$H_i=\underset{t_0}{\overset{t_1}{\mathrm{\&Sigma;}}}[P_t-P_0-S_{\mathrm{it}}{R}_i(t-t_0)]k_1\mathrm{<figure-callout\; id="1"\; label="T\; k"\; filenames="HDA0000090169880000021.png"\; state="\{\{state\}\}">T</figure-callout>}$ $k_{}$ ${}_1=\left\{\begin{array}{cc}1,& 0.033\&le;\left|\mathrm{\&Delta;f}\right|\&le;0.05\\ 3,& 0.05\&angle;\left|\mathrm{\&Delta;f}\right|\&le;0.1\\ 5,& 0.1\&angle;\left|\mathrm{\&Delta;f}\right|\&le;0.2\\ 7,& 0.2\&angle;\left|\mathrm{\&Delta;f}\right|\end{array}\right.---\left(1\right)$

Computing formula during microvariations is:

$H_i=\underset{t_0}{\overset{t_1}{\mathrm{\&Sigma;}}}[P_t-P_0-S_{\mathrm{it}}{R}_i(t-t_0)]k_{2}T$ $k_2=\left\{\begin{array}{cc}5,& 0\&le;(t_1-t_0)\&le;5\\ 3,& 5\&angle;(t_1-t_0)\&le;10\\ 1,& 10\&angle;(t_1-t_0)\end{array}\right.---\left(2\right)$

In formula 1, the formula 2, H _iPrimary frequency modulation integration electric weight for unit i; t ₀Be the out-of-limit moment of system frequency; t ₁For system frequency gets into the dead band constantly; P _tBe t actual the exerting oneself of unit i constantly; P ₀Be t ₀Actual the exerting oneself of unit i constantly; S _ItBe the AGC slave mode of the t moment this unit i, S when unit i does not receive Automatic Generation Control or Planning Directive not to adjust load _ItBe 0, S when unit is just receiving AGC or Planning Directive effect to load adjustment _ItBe 1; R _iAverage creep speed for unit i; T is an integration period; k ₁, k ₂Be integration weight, t ₁-t ₀Unit be s; Δ f is the difference of current frequency and rated frequency 50Hz, and the unit of Δ f is Hz;

The power amount of unbalance that big disturbance is an electrical network in 5 seconds surpasses when 1% of preload, and microvariations are that the power amount of unbalance of electrical network in 5 seconds is equal to or less than when 1% of preload.

Data and the step 2 of gathering with step 1)) the adjusting function of the generating set primary frequency regulation measured of formula 1, the 2 structure evaluation of being settled accounts.

Compared with prior art; Beneficial effect of the present invention is: a kind of generating set primary frequency regulation adjusting function of the present invention assay method; The improved additional weight integration electric weight algorithm that proposes; According to the true percentage contribution of primary frequency modulation to electrical network; Frequency difference or time periods different during to the large and small disturbance of frequency are adopted different weight coefficients, thereby make result of calculation can reflect unit primary frequency modulation action effect more scientifically and rationally, more scientifically distinguish the action situation of different unit primary frequency modulations; And take all factors into consideration different unit primary frequency modulation action accuracy and calculate its deserved primary frequency modulation economic compensation, and verified that with the real-time measurement data this new performance measurement method is exercisable fully with the contribution electric weight.Demonstrated the rationality of additional weight integration electric weight algorithm simultaneously with respect to common integration electric weight algorithm.Through applying this method; Can make each power plant, genco obtain more science, reasonable compensation according to primary frequency modulation actual contribution situation; Make its understanding, approval primary frequency modulation importance; Thereby transfer the enthusiasm that primary frequency modulation is participated in each generating plant better, improve mains frequency stability.

[description of drawings]

Fig. 1 is the process flow diagram of assay method of the present invention;

Fig. 2 is the frequency change curve during direct current locking in the embodiment of the invention;

Fig. 3 is two unit output change curves during the direct current locking in the embodiment of the invention.

[embodiment]

Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:

See also shown in Figure 1ly, the present invention proposes the contribution electric weight algorithm of additional weight in order to remedy the deficiency of existing assay method.Unit primary frequency modulation contribution electric weight is the comprehensive of unit primary frequency modulation many index, and it has reflected the actual contribution size of unit to mains frequency, and the introducing of this parameter makes the input of quantification unit primary frequency modulation function and the dynamics of input become possibility.

For better crossover frequency out-of-limit after; The primary frequency modulation of unit is to the frequency stabilization percentage contribution; Frequency disturbance is divided into big disturbance and microvariations; The power amount of unbalance that big disturbance is an electrical network in 5 seconds surpasses when 1% of preload, and microvariations are that the power amount of unbalance of electrical network in 5 seconds is equal to or less than when 1% of preload; The variation of total electric weight can be converted into the variation of frequency, and the variation of monitoring total electric weight through change of frequency is more convenient.Frequency takes place that the duration of primary frequency modulation was generally for tens seconds after the big disturbance; The primary frequency modulation actuating quantity of the generation when frequency departure is big more is valuable more; Having for rapid recovery system frequency, shortening frequency out-of-limit time is vital role more; Contribution electric weight during this period of time is bigger to the contribution of the safety and stability of electrical network, adopts the contribution electric weight algorithm of additional weight of the present invention, more science, distinguish the contribution that the unit primary frequency modulation is done frequency stabilization effectively.

Computing formula during big disturbance is suc as formula shown in 1, and this algorithm has shown according to mains frequency, the artificial dead band of primary frequency modulation and unit output the contribution electric weight calculating cumulative process of different periods with different weights.

$H_i=\underset{t_0}{\overset{t_1}{\mathrm{\&Sigma;}}}[P_t-P_0-S_{\mathrm{it}}{R}_i(t-t_0)]k_1\mathrm{<figure-callout\; id="1"\; label="T\; k"\; filenames="HDA0000090169880000021.png"\; state="\{\{state\}\}">T</figure-callout>}$ $k_{}$ ${}_1=\left\{\begin{array}{cc}1,& 0.033\&le;\left|\mathrm{\&Delta;f}\right|\&le;0.05\\ 3,& 0.05\&angle;\left|\mathrm{\&Delta;f}\right|\&le;0.1\\ 5,& 0.1\&angle;\left|\mathrm{\&Delta;f}\right|\&le;0.2\\ 7,& 0.2\&angle;\left|\mathrm{\&Delta;f}\right|\end{array}\right.---\left(1\right)$

After disturbance by a small margin takes place in frequency; The unit that system frequency has just surpassed artificial dead band responds particularly important fast; Reflected unit primary frequency modulation governing speed; Can distinguish unit primary frequency modulation contribution amount this moment according to unit primary frequency modulation response speed, gives big weight in frequency above the artificial dead band initial stage, and the computing formula during microvariations is suc as formula shown in 2.

$H_i=\underset{t_0}{\overset{t_1}{\mathrm{\&Sigma;}}}[P_t-P_0-S_{\mathrm{it}}{R}_i(t-t_0)]k_{2}T$ $k_2=\left\{\begin{array}{cc}5,& 0\&le;(t_1-t_0)\&le;5\\ 3,& 5\&angle;(t_1-t_0)\&le;10\\ 1,& 10\&angle;(t_1-t_0)\end{array}\right.---\left(2\right)$

In formula 1, the formula 2, H _iPrimary frequency modulation integration electric weight for unit i; t ₀Be the out-of-limit moment of system frequency; t ₁For system frequency gets into the dead band constantly; P _tBe t (t ₀To t ₁Between a certain moment) actual the exerting oneself of unit i constantly; P ₀Be t ₀Actual the exerting oneself of unit i constantly; S _ItBe the AGC slave mode of the t moment this unit i, S when unit i does not receive Automatic Generation Control or Planning Directive not to adjust load _ItBe 0, S when unit is just receiving AGC or Planning Directive effect to load adjustment _ItBe 1; R _iAverage creep speed for unit i; T is an integration period; k ₁, k ₂Be integration weight, t ₁-t ₀Unit be s; Δ f is the difference of current frequency and rated frequency 50Hz, and the unit of Δ f is Hz.

When being depicted as the precious direct current locking of 21:26 moral on February 26th, 2010 like Fig. 2,3, frequency variation curve figure and Weihe River Er Chang #6 machine, two unit output change curves of dam #4 machine.Can find out that by diagram after disturbance significantly took place frequency, Weihe River Er Chang #6 machine primary frequency modulation reaction velocity was very fast; Unit output descends very fast when frequency departure is big; And the amplitude of variation of exerting oneself is bigger, and after frequency difference diminished, unit output changed and also diminishes thereupon; Unit output is stronger to following property, the correlativity of frequency, and is bigger to the stable contribution of mains frequency.And dam #4 machine primary frequency modulation reaction velocity is slower; Than the Weihe River Er Chang #6 reaction time slow about 15 seconds; Unit output is not made timely response when frequency departure is maximum; Unit output also fails in time to recover when frequency difference is progressively recovered, and the correlativity of unit output and change of frequency is relatively poor, and is less relatively to the stable contribution of mains frequency.

The integration electric weight result who adopts additional weight integration assay method of the present invention and common integration electric weight algorithm to draw is as shown in table 1.Can find out because traditional integration electric weight algorithm is not considered weight calculation from table 1; Whole frequency out-of-limit in the time period weight identical because the group reaction of dam #4 machine is comparatively blunt, exerting oneself, it is longer to change the back duration; Differ very little at whole integrating range integration electric weight and Weihe River Er Chang #6 unit; Even more bigger than it, this integration electric weight algorithm is obviously reasonable inadequately, can not be truly, the primary frequency modulation of the reaction unit of science is to the percentage contribution of mains frequency.And adopt assay method of the present invention can more effectively measure unit to the stable percentage contribution of mains frequency; The primary frequency modulation of science, effective evaluation unit makes power plant obtain scientific and rational compensation according to unit primary frequency modulation actual act situation to the percentage contribution of mains frequency more.Help improving the enthusiasm that power plant improves primary frequency modulation performance, improve mains frequency stability.

Table 1 common integration electric weight algorithm and additional weight integration assay method of the present invention contrast

Claims (2)

1. a generating set primary frequency regulation adjusting function assay method is the mensuration of carrying out the adjusting function of primary frequency modulation for the genset with Automatic Generation Control, it is characterized in that, may further comprise the steps:

1), image data: gather mains frequency, have the actual AGC status data of exerting oneself, having the genset of Automatic Generation Control of the genset of Automatic Generation Control;

2) data of the above-mentioned collection of foundation are used the contribution electric weight algorithm computation primary frequency modulation integration electric weight of additional weight, distinguish big disturbance and microvariations during calculating and calculate respectively:

Computing formula during big disturbance is:

$H_i=\underset{t_0}{\overset{t_1}{\mathrm{\&Sigma;}}}[P_t-P_0-S_{\mathrm{it}}{R}_i(t-t_0)]k_{1}T$ $k_1=\left\{\begin{array}{cc}1,& 0.033\&le;\left|\mathrm{\&Delta;f}\right|\&le;0.05\\ 3,& 0.05\&angle;\left|\mathrm{\&Delta;f}\right|\&le;0.1\\ 5,& 0.1\&angle;\left|\mathrm{\&Delta;f}\right|\&le;0.2\\ 7,& 0.2\&angle;\left|\mathrm{\&Delta;f}\right|\end{array}\right.---\left(1\right)$

Computing formula during microvariations is:

$H_i=\underset{t_0}{\overset{t_1}{\mathrm{\&Sigma;}}}[P_t-P_0-S_{\mathrm{it}}{R}_i(t-t_0)]k_{2}T$ $k_2=\left\{\begin{array}{cc}5,& 0\&le;(t_1-t_0)\&le;5\\ 3,& 5\&angle;(t_1-t_0)\&le;10\\ 1,& 10\&angle;(t_1-t_0)\end{array}\right.---\left(2\right)$

In formula 1, the formula 2, H _iPrimary frequency modulation integration electric weight for unit i; t ₀Be the out-of-limit moment of system frequency; t ₁For system frequency gets into the dead band constantly; P _tBe t actual the exerting oneself of unit i constantly; P ₀Be t ₀Actual the exerting oneself of unit i constantly; S _ItBe the AGC slave mode of the t moment this unit i, S when unit i does not receive Automatic Generation Control or Planning Directive not to adjust load _ItBe 0, S when unit is just receiving AGC or Planning Directive effect to load adjustment _ItBe 1; R _iAverage creep speed for unit i; T is an integration period; k ₁, k ₂Be the integration weight; Δ f is the difference of current frequency and rated frequency 50Hz;

The power amount of unbalance that big disturbance is an electrical network in 5 seconds surpasses when 1% of preload, and microvariations are that the power amount of unbalance of electrical network in 5 seconds is equal to or less than when 1% of preload.

2. a kind of generating set primary frequency regulation adjusting function assay method according to claim 1 is characterized in that: the data and the step 2 that adopt step 1) to gather) the adjusting function of the generating set primary frequency regulation measured of formula 1, the 2 structure evaluation of being settled accounts.

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