CN101593975B - Energy-saving power generation dispatching method - Google Patents

Abstract

The invention belongs to the field of power system dispatching automation, and particularly provides an energy-saving power generation dispatching method. The method comprises the steps of: pre-defining real-time load rates of units; calculating coal consumption difference per-unit values of the units; establishing the mathematical relation among load rates, coal consumptions and discharge standards of the units according to the coal consumption difference per-unit values of the units; calculating to obtain the load rates and loads of the units according to the real-time load rates of the units and the established mathematical relation; and performing energy-saving power generation dispatching according to the load rates and the loads of the units. The technical proposal provided by the invention breaks the prior fixed thinking of 'a top table method', originates the thought and the method of linking designed coal consumption values and actual power generation equivalent load rates ofthe units together, constructs a related mathematic model, breaks the technical bottleneck of the field of energy-saving power generation dispatching, scientifically solves the important problem of implementing an energy-saving power generation dispatching principle into the actual establishment of power generation plans, and has important significance in the concrete implementation of energy-saving power generation dispatching.

Description

A kind of energy-saving power generation dispatching method

Technical field

The invention belongs to the dispatching automation of electric power systems field, be specially and propose a kind of energy-saving power generation dispatching method.

Background technology

With coal consumption, discharging is that the energy-saving power generation dispatching of core content is one of important process of China's power industry current and expected future.After " energy-saving power generation dispatching way " that State Council issues, the pilot each province has put into effect detailed rules for the implementation, core content is to guarantee power network safety operation, ensure on the reliable continuously basis of supplying of electric power, foundation is the sequencing table of order with regenerative resource, nuclear power, comprehensive utilization, cogeneration of heat and power, conventional coal machine, fuel oil unit, then according to the coal consumption height, take into account emission behaviour and formulated corresponding tagmeme table in the conventional coal machine.

Because conventional thermoelectricity accounted for significant proportion in China, energy-saving power generation dispatching should comprehensively correct understanding national policy, and also need are taken into account fail safe, operability, fairness and worked out a day generation schedule curve according to the actual conditions of electrical network simultaneously.The way that generation schedule curve establishment in existing domestic day is adopted is " a top table method ", i.e. preferentially band is full for the low power plant of coal consumption.Such way can be brought several problems:

1) coal consumption of power plant and unit performance, load level, design coal have very big relation, design coal consumption and actual coal consumption differ greatly, because the mensuration work to online coal consumption exists technical barrier to realize, adopt " top table method " to work out a day generation schedule curve and carry out energy-saving power generation dispatching and exist unjustness, because the little actual coal consumption difference of unit of design coal consumption difference may be very big.

2), adopt " top table method " to work out a day generation schedule curve and carry out the energy-saving power generation dispatching poor operability from operation angle.Because the low peak load regulation of coal consumption is very capable, add/load shedding speed is very fast, load rise very fast (as morning, noon when climbing) before since load band is full substantially, can't satisfy the zooming requirement of this period system loading by other unit, cause quality of power supply decline.

So carrying out energy-saving power generation dispatching in the prior art is to adopt " top table method " to work out a day generation schedule curve, exist big not enough like this.

Summary of the invention

The objective of the invention is to, propose a kind of energy-saving scheduling method, improve the fairness of energy-saving power generation dispatching, and strengthen operability, guarantee the quality of power supply.

The energy-saving scheduling method that the present invention proposes comprises:

Step 1, in advance according to the real-time load factor F of following formula definition unit:

F＝P/S

Wherein, P is that described unit is loaded in real time, and S is described unit current time maximum available;

Step 2, calculate each unit coal consumption difference perunit value according to following formula:

B(i，j)＝[R(i，j)-R0(j)]/R0(j)

Wherein, (i is an i platform unit j period coal consumption difference perunit value j) to B, and R0 (j) is the coal consumption of the minimum unit of j period coal consumption; (i j) is the coal consumption of the unit of participating in the distribution the i platform unit j period to R;

Step 3 according to described unit coal consumption difference perunit value, is set up the mathematical relationship between unit load rate and coal consumption, the discharge standard, and described mathematical relationship is as follows:

F(i，j)＝F0(j)-B(i，j)/K-[L0-L(i，j)]/K1

Wherein, (i j) is i platform unit j period unit load rate to F; F0 (j) is the minimum unit load rate of j period coal consumption; (i j) is i platform unit j period discharge standard to L; L0 is the national regulation comprehensive discharge standard; K is coal consumption regulation and control coefficients, and K1 is discharging regulation and control coefficient;

Step 4, according to the described mathematical relationship that the real-time load factor of described unit and the step 3 of step 1 definition are set up, calculate acquisition each unit load rate and load according to following formula:

$P\left(j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}F(i,j)\×S(i,j)$

$=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\{F0\left(j\right)-B(i,j)/K-[L0-L(i,j)]/K1\}\×S(i,j)$

Wherein, the described load curve of P (j) for participating in the distribution; (i j) is i platform unit j period unit active volume to S;

Step 5 is carried out energy-saving power generation dispatching according to described each unit load rate and load.

The energy-saving power generation dispatching method that the present invention proposes, with the measurement index of the real-time load factor of unit as energy-saving power generation dispatching, and by setting up the mathematical relationship between unit load rate and coal consumption, the discharge standard, and the finding the solution of each unit load rate and load, finally carry out energy-saving power generation dispatching according to calculating each the unit load rate and the load that obtain.Owing to introduced coal consumption regulation and control coefficient and discharging regulation and control coefficient, be not as arranging foundation with single coal consumption index, so energy-saving scheduling method is more fair, in addition, according to the energy-saving scheduling method that the present invention proposes, the low unit of coal consumption keeps when low ebb and the high close load factor of unit of coal consumption, can satisfy the zooming requirement of system loading before arriving in the peak, guarantee the quality of power supply, the realization of this method possesses operability.

Description of drawings

The energy-saving scheduling method schematic flow sheet that Fig. 1 proposes for the present invention.

Embodiment

Embodiment 1:

The energy-saving scheduling method that the present invention proposes as shown in Figure 1, comprising:

Step 1, in advance according to the real-time load factor F of following formula definition unit:

F＝P/S

Wherein, P is that unit is loaded in real time, and S is a unit current time maximum available.

Unit then calculates according to following formula in the load factor of a period:

$F=\frac{\∫P\left(t\right)\mathrm{dt}}{\∫S\left(t\right)\mathrm{dt}}$

P (t) is the unit curve that generates electricity in real time; S (t) for unit deduction maintenance, face repair, the active volume after the factor such as forced partial outage, dt is the time period.System is regarded as available because of need shut down standby unit by the scheduling institutional arrangement.Defining the real-time load factor of unit herein is because it is an important indicator of weighing energy-saving power generation dispatching.

Step 2 is a base value with the minimum unit coal consumption of coal consumption, calculates each unit coal consumption difference perunit value according to following formula:

B(i，j)＝[R(i，j)-R0(j)]/R0(j)

Wherein, (i j) is i platform unit j period coal consumption difference perunit value to B.

R0 (j) is the coal consumption of the minimum unit of j period coal consumption.

R (i j) is the coal consumption of the unit of participating in the distribution the i platform unit j period, i=1,2,3....N, owing to also there are not the data of coal consumption on-line operation at present, coal consumption that the present invention gets designs the coal consumption value for unit, so coal consumption difference perunit value also is a fixed value.

Step 3, set up the mathematical relationship between unit load rate and coal consumption, the discharge standard:

F(i，j)＝F0(j)-[R(i，j)-R0(j)]/R0(j)/K-[L0-L(i，j)]/K1

According to unit coal consumption difference perunit value, get final product:

F(i，j)＝F0(j)-B(i，j)/K-[L0-L(i，j)]/K1

Wherein, (i j) is i platform unit j period unit load rate to F.

F0 (j) is the minimum unit load rate of j period coal consumption under the situation of not considering to discharge.

(i j) is i platform unit j period discharge standard to L, and this value can go to discharge the current year accumulation standard.L0 is the national regulation comprehensive discharge standard, as 97%.

K is coal consumption regulation and control coefficients, and K1 is discharging regulation and control coefficient; K is to be used for determining load factor difference degree between different coal consumptions, the different unit that discharges with k1.

K, K1 value are the macro adjustments and controls coefficient of government control energy-saving power generation dispatching, two coefficients determine to want comprehensive following factor, the one, coal consumption perunit value difference, the 2nd, discharge standard, the 3rd, the system loading characteristic, the 4th, if supply of electric power wealth and other social factor are rich more, the K value is desirable littler, can widen the gap of the low and unit load rate that coal consumption is high of coal consumption.With Guangdong is example, the higher unit (125-135MW) of energy consumption is distributed in the mountain area basically, near the coal-producing area, coal price is relatively cheap, convenient transportation, but consider from the angle that ensures supply of electric power,, must guarantee that also these power plant will send certain electric weight even period of certain affluence is arranged in supply of electric power, otherwise, at high load capacity period (as summer), these power plant are because of capital quantity, the supply of electricity coal, status of equipment, factors such as operations staff can not make unit normally leave to cause short of electricity, therefore, the K value should not be too little, recommended value is 1.9-2.1, and whole result is under normal circumstances, and the unit that the operating load rate of the power plant that coal consumption is low is higher than coal consumption is high by about 15%.Equally, also be similar process to the value of K1, if the national regulation comprehensive discharge standard is 98%, and actual being emitted on about 94%, then difference value reaches 4%, is 2 so can get recommended value to the K1 value, makes difference value reduce to 2%.

Step 4, after real-time load factor serves as to weigh the index of energy-saving power generation dispatching method with unit, and set up according to the mathematical relationship between unit load rate and coal consumption, the discharging, can calculate according to following formula by the two and to obtain load curve:

$P\left(j\right)=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}F(i,j)\×S(i,j)$

$=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\{F0\left(j\right)-B(i,j)/K-[L0-L(i,j)]/K1\}\×S(i,j)$

Wherein, P0 (j) is 96 point load curves of the whole network, and 15 minutes is a point, j=1,2,3.....96.If with 5 minutes be 1 point, promptly the value of j is j=1,2,3.....288.Present embodiment all is described with the load curve of 96 points.But technical scheme of the present invention is equally applicable to adopt the load curve of 288 points.

P1 (j) is 96 point load curves of outsourcing electricity (as southwest electricity, Three Gorges, middle), special power plant (water power, pumped storage power plant, transferring electricity from the west to the east power plant, combustion gas unit, cogeneration and comprehensive utilization unit).

The load curve of P (j) for participating in the distribution, P (j)=P0 (j)-P1 (j).

(i j) is i platform unit j period unit active volume to S.

Equation to above-mentioned load curve is found the solution, and then can obtain:

$F0\left(j\right)=\left\{\right[P\left(j\right)+\underset{i=1}{\overset{n}{\mathrm{\Σ}}}B(i,j)/K+[L0-L(i,j)]/K1]\×S(i,j)\}/\underset{i=1}{\overset{n}{\mathrm{\Σ}}}S(i,j)$

The load factor F of other each generating set (i, j) then can according to formula F (i, j)=F0 (j)-B (i, j)/K-[L0-L (i, j)]/K1 calculates acquisition.And the load P of each generating set (i, j) according to formula P (i, j)=F (i, j) * (i j) tries to achieve S.

(i j) except that satisfying security constraint, also will satisfy minimum output requirement, plus-minus rate requirement, standby requirement to P.

Step 5 is carried out energy-saving power generation dispatching according to each unit load rate and load.Behind load factor that obtains each unit and load, can be according to this establishment day generation schedule curve.

5 units of present embodiment simulation 2235MW altogether participate in a day generation schedule curve distribution, unit capacity is respectively 135MW, 200MW, 300MW, 600MW, 1000MW, coal consumption is respectively 380,360,335,300,270g/Kwh, period is a low ebb 4:00-4:30 branch, peak 10:00-10:30 branch, carry out record according to 15 minutes points, have 6 points altogether, the corresponding load of participating in the distribution is respectively 1500-1400MW, 1900-2000MW, and exert oneself Pmin and speed of unit minimum technology is as shown in table 1.

5 units of table 1 participate in the peak and low ebb day generating curve distributes analog case

Suppose that emission behaviour is all the same, reached discharge standard, allocation result is as follows:

The average load rate of the unit of participating in the distribution is 76%, and wherein 1000MW unit distribution load rate is 79.8%, and the 600MW unit is 74.2%, and the 300MW unit is 70.5%, and the 200MW unit is 75.8%, and the 135MW unit is 69.6%.Specifically as shown in table 2.

The load factor distribution condition that table 2 each point distributes

Capacity

Coal consumption

Pmin

4:00

4:15

4:30

10:00

10:15

10:30

On average

Load

Mw

1500

1450

1400

1900

1950

2000

Unit 1

135

380

90

66.7％

66.7％

66.7％

70.4％

72.6％

74.8％

69.6％

Unit 2

200

360

150

75.0％

75.0％

75.0％

75.0％

76.5％

78.5％

75.8％

Unit 3

300

335

180

60.0％

60.0％

60.0％

78.7％

81.0％

83.3％

70.5％

Unit 4

600

300

300

64.0％

60.8％

57.8％

85.2％

87.5％

89.7％

74.2％

Unit 5

1000

270

400

69.6％

66.5％

63.3％

90.8％

93.0％

95.3％

79.8％

Add up to

2235

1120

67.1％

64.9％

62.6％

85.0％

87.2％

89.4％

76.0％

135MW, 200MW unit are because minimum steady combustion load is high, peak modulation capacity is poor, although the low-valley interval institute distribution load of dividing at 4:00-4:30 is a minimum steady combustion load, promptly so loads by the unit minimum minimum steady that index distributes of exerting oneself, but load factor is higher, even exceeds the big unit of 1000MW; Unit load rate difference peak period of dividing at 10:00-10:30 is then very obvious, and the highest minimum difference reaches 95.3%-74.8%=20.5%.For high energy consumption unit higher this situation of load factor during system requisition, can adopt exerts oneself in system shuts down standby method in well-to-do and reduces monthly or annual average load rate.

From as can be seen last, the unit allocation result is consistent with the workload demand variation tendency, and all units improve the fairness of energy-saving power generation dispatching all in the peak regulation work of participation system; And situation of change and coal consumption height is in close relations, can strengthen operability again, guarantees the quality of power supply.And available technology adopting " top table method " is carried out energy-saving distribution, and as these loads of 1-4 month, 10-12 month low periods, the high machine component of coal consumption constitutes grave danger to power plant's existence, even closes down less than electric weight; By the time loaded the peak period such as the 6-9 month, these power plant cause short of electricity because of factors such as capital quantity, electric coal supply, status of equipment, operations staff can not make unit normally leave, can not satisfy social need for electricity, simultaneously on-site social stability of power plant and economic development be had a negative impact.And adopting the solution of the present invention to carry out energy-saving power generation dispatching, the high unit of coal consumption still can be assigned to some electric weight in the low district of load and keep, and remains in operation in the electricity needs peak period and to satisfy social need for electricity.

Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.

Claims (1)

1. an energy-saving power generation dispatching method is characterized in that, comprising:

Step 1, in advance according to the real-time load factor F of following formula definition unit:

F＝P/S

Wherein, P is that described unit is loaded in real time, and S is described unit current time maximum available;

Step 2, calculate each unit coal consumption difference perunit value according to following formula:

B(i，j)＝[R(i，j)-R0(j)]/R0(j)

Wherein, (i is an i platform unit j period coal consumption difference perunit value j) to B, and R0 (j) is the coal consumption of the minimum unit of j period coal consumption; (i j) is the coal consumption of the unit of participating in the distribution the i platform unit j period to R;

Step 3 according to described unit coal consumption difference perunit value, is set up the mathematical relationship between unit load rate and coal consumption, the discharge standard, and described mathematical relationship is as follows:

F(i，j)＝F0(j)-B(i，j)/K-[L0-L(i，j)]/K1

Wherein, (i j) is i platform unit j period unit load rate to F; F0 (j) is the minimum unit load rate of j period coal consumption; (i j) is i platform unit j period discharge standard to L; L0 is the national regulation comprehensive discharge standard; K is coal consumption regulation and control coefficients, and K1 is discharging regulation and control coefficient;

Step 4, according to the described mathematical relationship that the real-time load factor of described unit and the step 3 of step 1 definition are set up, calculate acquisition each unit load rate and load according to following formula:

Wherein, the load curve of P (j) for participating in the distribution; (i j) is i platform unit j period unit active volume to S;

Step 5 is carried out energy-saving power generation dispatching according to described each unit load rate and load.

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