CN105226709A - The choosing method of generator order is excised in a kind of power grid high-frequency cutting machine allocation plan - Google Patents

Abstract

The present invention relates in a kind of power grid high-frequency cutting machine allocation plan the choosing method excising generator order, comprising: the whole generators selecting to participate in high-frequency cutting machine allocation plan; Obtain generated power corresponding to the frequency variation of the frequency variation Δ f of generator and generator to exert oneself variation delta P _g, and the difference coefficient R of calculating generator and limit response frequency f _gmax; Relatively start the operating frequency f cutting motor-driven work in high-frequency cutting machine allocation plan _cutwith the limit response frequency f of generator _gmax, the equivalent difference coefficient R ' of calculating generator is also converted into perunit value form R ' _*; By the R ' of whole generator _*order sequence is from big to small as preferential excision order; Method provided by the invention is by based on the unit power regulation of each generator self or the difference coefficient that can participate in high-frequency cutting machine, determine the generator order of the excision of prioritizing selection in high-frequency cutting machine scheme, thus use minimum cut machine amount control system frequency operate in zone of reasonableness and under the condition of cutting machine amount equally control system frequency and rated value deviation minimum.

Description

The choosing method of generator order is excised in a kind of power grid high-frequency cutting machine allocation plan

Technical field

The present invention relates to power system safety and stability control technology field, be specifically related to the choosing method excising generator order in a kind of power grid high-frequency cutting machine allocation plan.

Background technology

Frequency is an important parameter in power system operation, is also one of leading indicator weighing the quality of power supply.Power system frequency be all load consumption (comprising network loss) in the active power summation and system that send by all generators of paired running in system active power summation between balance maintain.When being subject to the disturbances such as large-sized unit tripping operation, interconnection disconnection or Large Copacity load switching when electric power system, because the active power balance of system is destroyed, system frequency is caused to change, when frequency change amplitude is larger, obvious adverse effect will be caused to power system operation, even cause the generation of frequency stabilization malicious event;

Being defined as according to " operation of power networks criterion " (DL/T10402007) keeps electric power system can stable operation, when system loading declines larger, need to take high-frequency cutting machine measure, when system frequency rises to a threshold value, configure multiple round and cut machine, cut-out generator; Such as from system frequency reaches 50.5Hz, frequency often raises 0.1Hz and excises a part of generator.If after a round cut machine completes, system power still has a large amount of surplus, frequency continues to rise, then can trigger next one and cut motor-driven work; If after a round cut machine completes, system power is in a basic balance, and frequency is controlled, then can not triggers next one again and cut motor-driven work, cut wheel for reducing, improving and cutting machine effect, improve the problems demand solution that each round cuts machine quality.

Summary of the invention

For the deficiencies in the prior art, the invention provides in a kind of power grid high-frequency cutting machine allocation plan the choosing method excising generator order, by based on the unit power regulation of each generator self or the difference coefficient that can participate in high-frequency cutting machine, determine the generator order of the excision of prioritizing selection in high-frequency cutting machine scheme, thus use minimum cut machine amount control system frequency operate in zone of reasonableness and under the condition of cutting machine amount equally control system frequency and rated value deviation minimum.

The object of the invention is to adopt following technical proposals to realize:

Excise a choosing method for generator order in power grid high-frequency cutting machine allocation plan, its improvements are, described method comprises:

(1) generator that can participate in high-frequency cutting machine allocation plan is selected;

(2) obtain generated power corresponding to the frequency variation of the frequency variation Δ f of described generator and described generator to exert oneself variation delta P _g, and calculate the difference coefficient R of described generator;

(3) limit response frequency f of described generator is calculated _gmax;

(4) the operating frequency f starting in high-frequency cutting machine allocation plan and cut motor-driven work is compared _cutwith the limit response frequency f of described generator _gmaxsize, calculate the equivalent difference coefficient R ' of described generator;

(5) the equivalent difference coefficient R ' of described generator is converted into perunit value form R ' _*;

(6) by the R ' of whole generator _*order sequence is from big to small as preferential excision order.

Preferably, described step (1) comprising:

(1-1) select conventional power plant unit, determine whether unconventional Power Plant participates in high-frequency cutting machine allocation plan according to actual conditions;

(1-2) select directly to receive dispatching of power netwoks and run the Power Plant that department's United Dispatching arranges instruction, determine whether power plant for self-supply's unit participates in high-frequency cutting machine allocation plan according to actual conditions;

(1-3) Power Plant of option and installment high-frequency cutting machine Signal reception and final controlling element, or possess the Power Plant of Install and configure high-frequency cutting machine Signal reception and final controlling element;

(1-4) the Power Plant total capacity that described step (1-1) to (1-3) is selected is greater than the maximum of described high-frequency cutting machine allocation plan needs configuration and cuts machine capacity.

Preferably, described step (2) comprising:

Calculate the difference coefficient R of described generator, formula is:

$R=\frac{1}{K_G}=-\frac{\mathrm{\Δ}f}{{\mathrm{\ΔP}}_G}---\left(1\right)$

In formula (1), K _gfor the unit power regulation of described generator.

Preferably, described step (3) comprising:

Calculate the limit response frequency f of described generator _gmax, formula is:

f _Gmax＝f _B-R·ΔP _Gmax(2)

In formula (2), f _b=50Hz is frequency base value, and R is the difference coefficient of described generator, Δ P _gmaxfor the power adjustments upper limit of described generator.

Preferably, described step (4) comprising:

If f _cut≤ f _gmax, then the equivalent difference coefficient R ' formula of described generator is:

R′＝R(3)

In formula (3), R is the difference coefficient of described generator;

If f _cut> f _gmax, then the equivalent difference coefficient R ' formula of described generator is:

$R^{\′}=-\frac{f_{cut}-f_B}{{\mathrm{\ΔP}}_{G\max }}---\left(4\right)$

In formula (4), f _b=50Hz is frequency base value, Δ P _gmaxfor the power adjustments upper limit of described generator.

Preferably, described step (5) comprising:

If f _cut≤ f _gmax, f _cutfor starting the operating frequency of cutting motor-driven work in high-frequency cutting machine allocation plan, f _gmaxfor the limit response frequency of described generator, then the perunit value form R ' of described equivalent difference coefficient R ' _*formula is:

$R_{*}^{\′}=R\·\frac{P_B}{f_B}---\left(5\right)$

In formula (5), P _bfor described generator rating power, f _b=50Hz is frequency base value, and R is the difference coefficient of described generator;

If f _cut> f _gmax, then the perunit value form R ' of described equivalent difference coefficient R ' _*formula is:

$R_{*}^{\′}=-\frac{f_{cut}/f_B-1}{{\mathrm{\ΔP}}_{Gmax}/P_B}---\left(6\right)$

In formula (6), f _cutfor starting the operating frequency of cutting motor-driven work in high-frequency cutting machine allocation plan, Δ P _gmaxfor the power adjustments upper limit of described generator, P _bfor described generator rating power, f _b=50Hz is frequency base value.

Compared with immediate prior art, the beneficial effect that the present invention has:

(1) excising the choosing method of generator order in a kind of power grid high-frequency cutting machine allocation plan provided by the invention, by choosing the preferential excision order of generator, providing guidance for work of electric power system personnel carry out high-frequency cutting machine arrangements;

(2) choosing method of generator order is excised in a kind of power grid high-frequency cutting machine allocation plan provided by the invention, can make control power system frequency under a certain load unbalanced amount condition determined, frequency is no more than the upper frequency limit that generator normally runs permission, needed for machine of the cutting total amount taked minimum;

(3) choosing method of generator order is excised in a kind of power grid high-frequency cutting machine allocation plan provided by the invention, can make control power system frequency under a certain load unbalanced amount condition determined, excision identical capacity generator after, system cloud gray model frequency and rated value deviation minimum.

Accompanying drawing explanation

Fig. 1 is the choosing method flow chart excising generator order in a kind of power grid high-frequency cutting machine allocation plan provided by the invention;

Fig. 2 simplifies electric network model schematic diagram in the embodiment of the present invention;

Fig. 3 is the model framework chart of speed regulator electrohydraulic servo system GA in the PSD-BPA electric system simulation analysis software of embodiment of the present invention use;

Fig. 4 is the model framework chart of speed regulator regulating system GI in the PSD-BPA electric system simulation analysis software of embodiment of the present invention use;

Fig. 5 is the model framework chart of speed regulator regulating system GJ in the PSD-BPA electric system simulation analysis software of embodiment of the present invention use;

Fig. 6 is that the embodiment of the present invention adopts two kinds of different machine of cutting measure mains frequency change curve result figure.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.

The invention provides in a kind of power grid high-frequency cutting machine allocation plan the choosing method excising generator order, as shown in Figure 1, comprising:

(1) generator that can participate in high-frequency cutting machine allocation plan is selected;

(2) obtain generated power corresponding to the frequency variation of the frequency variation Δ f of described generator and described generator to exert oneself variation delta P _g, and calculate the difference coefficient R of described generator;

Wherein, the frequency variation Δ f of the described generator of described acquisition and generated power corresponding to the frequency variation of described generator are exerted oneself variation delta P _gby under generator rating power running status, can carry out load rejection experiment, the frequency variation Δ f of record generator and generated power corresponding to the frequency variation of described generator are exerted oneself variation delta P _gor according to the controller parameter such as generator excitation, speed governing of actual measurement, use the method for Computer Simulation, generator and controller model thereof is set up in power system analysis software, generator is adjusted to and operates in rated power state, the rotating speed of generator and changed power response when simulation load declines, the variation delta P thus generated power corresponding to the frequency variation obtaining the frequency variation Δ f of described generator and described generator is exerted oneself _g;

(3) limit response frequency f of described generator is calculated _gmax;

(4) the operating frequency f starting in high-frequency cutting machine allocation plan and cut motor-driven work is compared _cutwith the limit response frequency f of described generator _gmaxsize, calculate the equivalent difference coefficient R ' of described generator;

Wherein, the operating frequency f cutting motor-driven work is started in described high-frequency cutting machine allocation plan _cutcan set according to actual conditions, " operation of power networks criterion " (DL/T10402007) is defined as and keeps electric power system can stable operation, when system loading declines larger, need to take high-frequency cutting machine measure, when system frequency rises to certain limit value, configure multiple round and start the operating frequency f cutting motor-driven work _cutcarry out cutting machine measure, cut-out generator;

Such as: from system frequency reaches 50.5Hz, frequency often raises 0.1Hz and excises a part of generator, then the operating frequency f of motor-driven work is cut in the startup of system _cutbe followed successively by: 50.5Hz, 50.6Hz, 50.7Hz ... if after a round cut machine completes, system power still has a large amount of surplus, frequency continues to rise, then can trigger next one and cut motor-driven work; If after a round cut machine completes, system power is in a basic balance, and frequency is controlled, then can not triggers next one again and cut motor-driven work.

(5) the equivalent difference coefficient R ' of described generator is converted into perunit value form R ' _*;

(6) by the R ' of whole generator _*order sequence is from big to small as preferential excision order.

Concrete, described step (1) comprising:

(1-1) select conventional power plant unit, determine whether unconventional Power Plant participates in high-frequency cutting machine allocation plan according to actual conditions;

Wherein, described conventional power plant unit comprises: the Power Plant such as hydroelectric plant, thermal power plant, and described unconventional Power Plant comprises: the Power Plant such as cogeneration power plant, nuclear power plant;

(1-2) select directly to receive dispatching of power netwoks and run the Power Plant that department's United Dispatching arranges instruction, determine whether power plant for self-supply's unit participates in high-frequency cutting machine allocation plan according to actual conditions;

(1-3) Power Plant of option and installment high-frequency cutting machine Signal reception and final controlling element, or possess the Power Plant of Install and configure high-frequency cutting machine Signal reception and final controlling element;

(1-4) the Power Plant total capacity that described step (1-1) to (1-3) is selected is greater than the maximum of described high-frequency cutting machine allocation plan needs configuration and cuts machine capacity.

Described step (2) comprising:

Calculate the difference coefficient R of described generator, formula is:

$R=\frac{1}{K_G}=-\frac{\mathrm{\Δ}f}{{\mathrm{\ΔP}}_G}---\left(1\right)$

In formula (1), K _gfor the unit power regulation of described generator.

Described step (3) comprising:

Calculate the limit response frequency f of described generator _gmax, formula is:

f _Gmax＝f _B-R·ΔP _Gmax(2)

In formula (2), f _b=50Hz is frequency base value, and R is the difference coefficient of described generator, Δ P _gmaxfor the power adjustments upper limit of described generator.

Described step (4) comprising:

If f _cut≤ f _gmax, then the equivalent difference coefficient R ' formula of described generator is:

R′＝R(3)

In formula (3), R is the difference coefficient of described generator;

If f _cut> f _gmax, then the equivalent difference coefficient R ' formula of described generator is:

$R^{\′}=-\frac{f_{cut}-f_B}{{\mathrm{\ΔP}}_{G\max }}---\left(4\right)$

In formula (4), f _b=50Hz is frequency base value, Δ P _gmaxfor the power adjustments upper limit of described generator.

Described step (5) comprising:

If f _cut≤ f _gmax, f _cutfor starting the operating frequency of cutting motor-driven work in high-frequency cutting machine allocation plan, f _gmaxfor the limit response frequency of described generator, then the perunit value form R ' of described equivalent difference coefficient R ' _*formula is:

$R_{*}^{\′}=R\·\frac{P_B}{f_B}---\left(5\right)$

In formula (5), P _bfor described generator rating power, f _b=50Hz is frequency base value, and R is the difference coefficient of described generator;

If f _cut> f _gmax, then the perunit value form R ' of described equivalent difference coefficient R ' _*formula is:

$R_{*}^{\′}=-\frac{f_{cut}/f_B-1}{{\mathrm{\ΔP}}_{Gmax}/P_B}---\left(6\right)$

In formula (6), f _cutfor starting the operating frequency of cutting motor-driven work in high-frequency cutting machine allocation plan, Δ P _gmaxfor the power adjustments upper limit of described generator, P _bfor described generator rating power, f _b=50Hz is frequency base value.

Embodiment provided by the invention, as shown in Figure 2, adopts a simplification electric network model with 3 local power plant.There are 2 generators in power plant 1, and rated power is 600MW, and speed regulator is GA/GI type governor model; There are 2 generators in power plant 2, and rated power is 600MW, and speed regulator is GA/GI type governor model; There are 2 generators in power plant 3, and rated power is 300MW, and speed regulator is GA/GJ type governor model.Wherein, the model of speed regulator electrohydraulic servo system GA, regulating system GI and GJ is respectively as shown in Fig. 3,4 and 5.

Make whole generators of 3 local power plant all can participate in high-frequency cutting machine arrangements, 2 rated power of power plant 1 are the generator of 600MW, and 2 rated power of power plant 2 are the generator of 600MW, and 2 rated power of power plant 3 are the generator of 300MW.

By the method for Computer Simulation, generator and controller model thereof is set up in power system analysis software, generator is adjusted to and operates in rated power state, simulate rotating speed and the changed power response of generator when load declines, measure the difference coefficient of each generator.

According to simulation result, 2 generator unit power regulations of power plant 1 are difference coefficient is R ₁=0.016Hz/MW, the power adjustments upper limit 2 generator unit power regulations of power plant 2 are difference coefficient is R ₂=0.132Hz/MW, the power adjustments upper limit 2 generator unit power regulations of power plant 3 are difference coefficient is R ₃=0.017Hz/MW, the power adjustments upper limit ${\mathrm{\ΔP}}_{G_{3}max}=-18MW.$

Calculate the limit response frequency of each generator.

$f_{G_{1}max}=f_B-R_1\·{\mathrm{\ΔP}}_{G_{1}max}=50-0.016\·(-36)=50.576Hz$

$f_{G_{2}max}=f_B-R_2\·{\mathrm{\ΔP}}_{G_{2}max}=50-0.132\·(-36)=54.752Hz$

$f_{G_{3}max}=f_B-R_3\·{\mathrm{\ΔP}}_{G_{3}max}=50-0.017\·(-18)=50.306Hz$

Consideration is carried out generator to the high-frequency cutting machine round that operating frequency is 50.5Hz and is preferentially excised sequence, i.e. f _cut=50.5Hz.Because with all be greater than f _cut, the therefore equivalent difference coefficient R ' of power plant 1 and power plant 2 ₁=R ₁, R ' ₂=R ₂, because be less than f _cut, calculate the generator of power plant 3 at f _cutequivalent difference coefficient

The equivalent difference coefficient of power plant 1, power plant 2 and power plant 3 is converted to perunit value form respectively:

$R_{1*}=R_1\frac{P_1}{f_B}=0.016\·\frac{600}{50}=0.192$

$R_{2*}=R_2\frac{P_2}{f_B}=0.132\·\frac{600}{50}=1.584$

$R_{3*}=-\frac{f_{cut}/f_B-1}{{\mathrm{\ΔP}}_{G_{3}max}/P_B}=-\frac{50.5/50-1}{-18/300}=0.167$

Ranking results is R _2*> R _1*> R _3*, the generator of Ji Yingxianqie power plant 2, then cuts the generator of power plant 1, finally cuts the generator of power plant 3.Ranking results is verified, disconnect with external electrical network interconnection, under the unbalanced condition of emergent power, respectively 1 600MW generator of excision power plant 1,2 300MW generators, two kinds of control measure of excision power plant 3 are emulated, the relatively frequency change situation of partial electric grid, result as shown in Figure 6.Can see, adopt the measure of 1 600MW generator of excision power plant 1 than the measure adopting 2 the 300MW generators excising power plant 3, system frequency is closer to rated frequency 50Hz.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although with reference to above-described embodiment to invention has been detailed description; those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement; and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed within claims of the present invention.

Claims (6)

1. excise a choosing method for generator order in power grid high-frequency cutting machine allocation plan, it is characterized in that, described method comprises:

(1) generator that can participate in high-frequency cutting machine allocation plan is selected;

(2) obtain generated power corresponding to the frequency variation of the frequency variation Δ f of described generator and described generator to exert oneself variation delta P _g, and calculate the difference coefficient R of described generator;

(3) limit response frequency f of described generator is calculated _gmax;

(4) the operating frequency f starting in high-frequency cutting machine allocation plan and cut motor-driven work is compared _cutwith the limit response frequency f of described generator _gmaxsize, calculate the equivalent difference coefficient R ' of described generator;

(5) the equivalent difference coefficient R ' of described generator is converted into perunit value form R ' _*;

(6) by the R ' of whole generator _*order sequence is from big to small as preferential excision order.

2. the method for claim 1, is characterized in that, described step (1) comprising:

(1-1) select conventional power plant unit, determine whether unconventional Power Plant participates in high-frequency cutting machine allocation plan according to actual conditions;

(1-2) select directly to receive dispatching of power netwoks and run the Power Plant that department's United Dispatching arranges instruction, determine whether power plant for self-supply's unit participates in high-frequency cutting machine allocation plan according to actual conditions;

(1-3) Power Plant of option and installment high-frequency cutting machine Signal reception and final controlling element, or possess the Power Plant of Install and configure high-frequency cutting machine Signal reception and final controlling element;

(1-4) the Power Plant total capacity that described step (1-1) to (1-3) is selected is greater than the maximum of described high-frequency cutting machine allocation plan needs configuration and cuts machine capacity.

3. the method for claim 1, is characterized in that, described step (2) comprising:

Calculate the difference coefficient R of described generator, formula is:

$R=\frac{1}{K_G}=-\frac{\mathrm{\Δ}f}{{\mathrm{\ΔP}}_G}---\left(1\right)$

In formula (1), K _gfor the unit power regulation of described generator.

4. the method for claim 1, is characterized in that, described step (3) comprising:

Calculate the limit response frequency f of described generator _gmax, formula is:

f _Gmax＝f _B-R·ΔP _Gmax(2)

In formula (2), f _b=50Hz is frequency base value, and R is the difference coefficient of described generator, Δ P _gmaxfor the power adjustments upper limit of described generator.

5. the method for claim 1, is characterized in that, described step (4) comprising:

If f _cut≤ f _gmax, then the equivalent difference coefficient R ' formula of described generator is:

R′＝R(3)

In formula (3), R is the difference coefficient of described generator;

If f _cut> f _gmax, then the equivalent difference coefficient R ' formula of described generator is:

$R^{\′}=-\frac{f_{cut}-f_B}{{\mathrm{\ΔP}}_{G\max }}---\left(4\right)$

In formula (4), f _b=50Hz is frequency base value, Δ P _gmaxfor the power adjustments upper limit of described generator.

6. the method for claim 1, is characterized in that, described step (5) comprising:

If f _cut≤ f _gmax, f _cutfor starting the operating frequency of cutting motor-driven work in high-frequency cutting machine allocation plan, f _gmaxfor the limit response frequency of described generator, then the perunit value form R ' of described equivalent difference coefficient R ' _*formula is:

$R_{*}^{\′}=R\·\frac{P_B}{f_B}---\left(5\right)$

In formula (5), P _bfor described generator rating power, f _b=50Hz is frequency base value, and R is the difference coefficient of described generator;

If f _cut> f _gmax, then the perunit value form R ' of described equivalent difference coefficient R ' _*formula is:

$R_{*}^{\′}=-\frac{f_{cut}/f_B-1}{{\mathrm{\ΔP}}_{Gmax}/P_B}---\left(6\right)$

In formula (6), f _cutfor starting the operating frequency of cutting motor-driven work in high-frequency cutting machine allocation plan, Δ P _gmaxfor the power adjustments upper limit of described generator, P _bfor described generator rating power, f _b=50Hz is frequency base value.