JPS59162726A - Generating plant operation controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an operation control device for a power generation plant composed of a plurality of power generation units.

[Technical background of the invention and its problems]

Recently, composite cycle power generation units have been developed and are being put into practical use with the aim of improving power generation efficiency.

This power generation unit combines a gas turbine and a steam turbine, and uses the exhaust gas that has been used to drive the gas turbine to drive the steam turbine, thereby making effective use of thermal energy. However, since this power generation unit has a small single unit capacity, it is necessary to configure a single power generation plant with multiple units for system operation. Furthermore, since this power generation plant has only recently been developed, its operation control system has not been completely established, but it is expected that it will take a control form that is slightly different from conventional ones.

For example, since individual power generation units can be started and stopped easily, this power generation plant is used for operation control with a wide range of load adjustment.

Now, when operating such a power generation plant in a system, the number of operating power generation units is usually calculated based on the maximum capacity of the power generation unit and the minimum continuous operation load condition, and the power generation efficiency is determined according to the power generation plant load at that time. It is conceivable to determine the maximum value.

However, when determining the number of operating power generating units using this method, the number of operating power generating units may have to be changed in a short period of time, resulting in
The energy loss caused by the stoppage is greater, and the problem arises that it is not possible to operate with good power generation efficiency.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a power generation plant operation control device that can determine the number of power generation units in operation so as to maximize operating efficiency, including start-up and stop losses, during load adjustment.

[Summary of the Invention] Therefore, the present invention is activated when determining the number of operating power generation units according to the load of the power generation plant.

The feature is that the stop loss is compared with the loss due to reduction in power generation efficiency in the case of not starting or stopping, and the number of operating units is determined depending on the magnitude of the loss.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. FIG. 1 shows a system configuration diagram of a power plant operation control device according to an embodiment of the present invention.
2 is a load control device, 2 is a process computer, and 3 is a data setting device. This data setting device 3 is generally used for exchanging information between a human and a computer, and when a human gives commands, setting values, etc. to the computer, it is done through the setting device. The daily power plant load pattern set by the data setting device 3 is input to the process computer 2 as a load/turn setting signal S. The process computer 2 shown in the figure monitors and controls the entire power generation ground 5 based on the power generation unit operation monitoring control signal S2 obtained from each power generation unit 4. That is, the process computer 2 monitors the operating status of each device in the power generation plant 5, performs many operations necessary for starting and stopping the power generation unit 4 in place of humans, and controls each control device and auxiliary equipment of the power generation unit. A control command S3 is output to. The load control device 1 performs output load control of the power generation unit, and performs output load control of the power generation unit during load operation in accordance with a power generation plant target load given from the outside. The power plant target load is generally set by a person or provided by the process computer 2. When setting a target load from the process computer 2, the target load signal is transmitted from the process computer 2 to the load control device 1 as a load control device monitoring control signal S4. In other words, when a person sets the power generation plant load gloss turn on -day using the data setting device 3, the power generation plant load pattern is input to the process computer 2, and the process computer 2 controls the start/stop of the power generation unit according to the load pattern. In addition, the target load calculated based on the load pattern is transmitted from the process computer 2 to the load control device 1, and the load control device 1 determines that the total load of the power generation units 4 activated by the process computer 2 is
The output load of the power generation unit 4 is controlled to reach the target load.

FIG. 2 shows a functional block diagram of the process computer 2, and 20 is a power generation unit maximum and minimum load storage section that stores a power generation unit maximum load signal 820 and a power generation unit minimum load signal Sat.

The power generation unit maximum load signal S20 stored in advance in the storage unit 20 is determined by the rated capacity of the power generation unit 4, and the power generation unit minimum load signal Sat is determined by the steam turbine thermal stress and the exhaust gas NOx pollution limit value.

21 is a power generation unit load efficiency storage section that stores power generation unit load efficiency curve parameters Sl. As shown in FIG. 3, the power generation unit load efficiency curve stored in advance in the storage unit 21 indicates the power generation unit efficiency with respect to load changes from the minimum continuous operating load MINL to the maximum continuous operating load MAXL. be. As is clear from this figure, the efficiency of the power generation unit 4 increases as the output load of the power generation unit increases.

Reference numeral 22 is a power generation unit start-up/stop loss storage section that stores the power generation unit start-up/stop loss signal SO3. The power generation unit start-up and stop losses stored in advance in this storage section 22 are the start-up losses of the power generation unit 4.

Shows the total amount of fuel, electricity, auxiliary steam, and make-up water consumed during the shutdown process.

Reference numeral 23 denotes an input processing section for applying the load turn setting signal Sl inputted from the data setting device 3 shown in FIG. 1 to the operating number calculation section 24. The load pattern setting signal S1 is set by the operator via the data setting device 3,
It is as shown in FIG. That is, FIG. 4 shows an example of a daily load pattern curve, and the horizontal axis represents the elapsed time of the day.

The vertical axis shows the power plant load. According to the diagram,
During the time periods to-ti, t, and 5-to, there is little demand for electricity because it is late at night, and the power generation plant operates at a low load. Further, from j2 to t3 and from t6 to tγ, the power demand is large due to factory operation, resulting in high load operation. Furthermore, t4~t! I indicates that the load on the power generation plant is reduced due to the lunch break.

The operation number calculation section 24 receives the signal 82G from each section explained above.
= 0, which is a part that reads Sts and S9 and calculates the number of operating power generating units based on these signals. In addition, 25 stores the target operating number of power generating units signal 824 calculated by the operating number calculating section 24 in this way. This is the target operating number storage unit.

With the above configuration, the target number of operating power generating units 4 is determined by the operating number calculation unit 24 as shown in the flowchart of FIG. 2 is executed.

That is, the operation number calculating section 24 first receives the load no.4 turn setting signal S! via the input processing section z3. Load (Part A)
. As described above, the load turn setting signal s1 read by the operating unit calculation unit 24 is based on the power generation plant load LpI (Lpo ``LPs) and the load change time t+ necessary to set the load pattern curve as shown in FIG. 4, for example.
(to "to") etc.

Next, the operation number calculation unit 24 calculates the above set load Lpl.
(Lp0 to Lp3) and the power generation unit maximum continuous operating load MAX obtained from the power generation unit maximum and minimum load storage unit 20
Based on L, the number n1 of operating power generation units with the highest power generation efficiency corresponding to the above set load, i (Lpo ~ L, 3) is always determined without considering the start-up and stop loss of the power generation unit 4.
(no-ns) is calculated using the following formula (Part A).

Lp amount n+=(/ ) decimal rounded up ・・・・・・・・・・・・
- (1) AXL Next, the operating number calculating section 24 determines whether the number of operating vehicles corresponding to each set load calculated using the above formula (1) satisfies the following formula (section 1).

nl (min (n6 e no) Curved surface...Curve...(2) The above equation (2) indicates that the number of operating vehicles nl during the relatively short time t4 to t5 is the same as the number nl during the relatively long time t! to t3 and t6. ~ Number of operating vehicles nQp at t7,
This is a formula that indicates that the smaller the number of ng, the smaller the number of vehicles.If the above equation (2) does not hold, there is no need to change the number of operating vehicles calculated in part A above. Well, if the load is uneven in the morning like on Saturday, so no > nt = n*, or if the load is uniform throughout the day like on Sunday, then n6 "rJ = n2. shi, in the afternoon katayose shi n6
When =n1 <n2, power generation efficiency can be maximized by operating the power generation plant with the number of units in operation calculated in part A above. However, as shown in the load pattern curve in FIG. 4, if the distribution of the number of operating vehicles satisfies the above formula (2), the number of operating vehicles n! It is necessary to consider starting and stopping losses.

Therefore, the number of operating vehicles calculation unit 24 increases the number of operating vehicles from 16 to 1.
To reduce the number of units to 1, first reduce the number of units by 1, and then
Calculate the loss n in the case of +1 unit using the following formula (Engineering Department).

ηn1-ft ("pt/nt)...Song...
・Egg・(3) ηn1 +1=fs (Lp, / n
l+ 1 )・−(4) Ln=τI XLPI (,
1/ηnl +11/'l n 1) ・-・(5) Here, 41 ri and ηn1+1 are the power plant load Lp
It represents the power generation efficiency when t is operated with the number of operating power generation units n1 and nl+1, and is determined by the function curve f in FIG. 3. In addition, τ is the time t4 to 1s, that is, τ1 ""
ts −t4.

Next, the operation number calculation unit 24 calculates the loss L calculated by the engineering department.
Compare n with the shutdown and startup loss for one power generation unit obtained from the power generation unit startup and shutdown loss storage section 22, and determine whether the following formula is satisfied (Part O).

Ln <Ls ・・・・・・・・・・・・ Song・(6
) As a result, if the above equation (6) does not hold true, even if there is a loss due to stopping and starting the power generation unit 4, the number of operating units n! calculated in part A above will remain the same. Since there is less energy loss when the vehicles are operated in the same manner, the number of vehicles in operation nl is not intentionally changed.

However, if the above equation (6) holds, then the time t4 to t
The number of operating vehicles n1 calculated in Part A above for the number of operating vehicles in 8
By adding one more unit and setting n 1 = n 1 + 1 ---- (7), the number of operating units to be stopped and started is reduced by one (power section).

Furthermore, the operating unit number calculation unit 24 compares the power generation unit load Lp1/ when n1=nl+l with the power generation unit minimum continuous operating load MINL obtained from the power generation unit maximum and minimum load storage unit 20, and calculates the following formula. Decide whether you are satisfied or not (Ki part).

L□/n1≦MINL・・・・・・・・・・・・・・・
...(7) As a result, if the above equation (7) does not hold, it can be seen that the power generation unit load at this time still has a margin up to the minimum continuous operation load MINL, so the above two parts are Go back and repeat the above-mentioned series of processes again.

On the other hand, if the above formula (7) holds true, by increasing the number of operating power generation units 4 in the power section by one, the power generation unit load Lp * / n 1 becomes equal to or less than the minimum continuous operation load of the power generation unit MINL.夛、However, you will not be able to operate power generation unit 4, so at that time, reduce the number of units in operation to 1.
Reduce the number of units, nw=ntl ・・・・・・・・・・・・・・・・・・
As (8), the number of vehicles in operation from time t4 to ts is n! Determine.

To summarize the above, the operating unit number calculation unit 24 first calculates the maximum efficiency operating unit number no +nl +n2 based on the load pattern curve given from the data setting device 3 without considering stoppage and startup losses. Next, according to this calculation result, τ1=t5 t for a relatively short time,
The power generation unit was stopped at .

If you have to start, then stop.

Based on equations (3) to (6), it is determined which is more efficient: reducing the number of activated machines or using the number of operating machines as calculated above. As a result, the number of operating vehicles n calculated above is
l If it is more efficient to increase the number of units that are stopped and started, that is, to reduce the number of units that are stopped and started, determine the number of operating units nl within a range where the load of the generation unit at that time does not become less than the minimum continuous operation load of the generation unit MINL. .

In this way, the most efficient number of operating power generation units 4 including start-up and stop losses is determined according to the load pattern curve. Based on this result, the process computer 2 controls the start and stop of the power generation unit 4 in the power generation plant 5. At the same time, the load control device 1 performs load control so that the output load of each power generation unit 4 becomes the power generation unit load LP□/ht. This allows the power plant 5 to be operated at maximum efficiency.

The above has described an example in which the power generation unit startup loss and stoppage loss are constant; however, in general, the startup loss of the power generation unit 4 changes depending on the time the power generation unit 4 is stopped. That is, the longer the power generation unit 4 is stopped, the more energy υ is required to start the power generation unit 4, and the larger the power generation unit startup loss becomes. 6th
The figure shows how the starting loss changes with respect to the power generation unit stop time at this time. In the figure, the horizontal axis shows the power generation unit stop time, and the vertical axis shows the start loss of the power generation unit. Therefore, an embodiment in which the power generation unit starting loss is variable will be described below.

FIG. 7 shows an overall configuration diagram of a power plant operation control system showing another embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 indicate the same parts, and the difference is that the power generation unit operation priority order signal S is transmitted from the data setter 3 to the system process computer 2.

FIG. 8 shows a functional block diagram of the process computer 20 in FIG. 7. In the figure, the same reference numerals as in FIG. A power generation unit stop time processing section 26 is provided which integrates the stop time of the corresponding power generation unit 4 based on the sum and outputs a power generation unit/) stop time signal S26 obtained by the integration to the operating unit number calculation section 24. This is also the point that the power generation unit operation priority order signal S11 is also transmitted from the input processing section 23 to the number of operating units calculation section 24. The power generation unit stop signal SO5 is converted from the power generation unit operation monitoring control signal S: in FIG. 7 to the process calculator 2.
This is given to the 0 input processing section 23 in correspondence with each power generation unit 4.

With the above configuration, in this embodiment, the startup loss of the power generation unit is calculated according to the power generation unit stoppage time, and the number of operating power generation units maximizes the power generation plant efficiency including startup and stoppage losses. .

That is, as shown in the flowchart of FIG. 9, the operating unit number calculation unit 24 reads the power generation plant load pattern and the power generation unit operation priority order in part A, and performs the same processing as explained in FIG. 5 of the above embodiment.

After executing the first part and the second part, in the second part, the power generation unit to be started as the first unit due to the increase in load up to time ts-t in Fig. 4 is determined according to the power generation unit operation priority order read in part A. I ask for it. Next, the stop time of the power generation unit is determined. In this case, the stop time T8TP corresponding to each power generation unit is integrated and stored in the power generation unit stop time processing section 26 in FIG. 8.

When the operating unit calculation unit 24 obtains the stop time T87P of the power generation unit to be started from the power generation unit stop time processing unit 26, the power generation unit start-up loss curve f2 shown in FIG. 6 is obtained.
From this, calculate the power generation unit startup loss "8TR" using the following formula (see part).

L8TR='! (TgTP)・・・・・・・・・
(9) Furthermore, the number of operating units calculation section 24 calculates the power generation unit start-up loss LIITR calculated in the above section and its value obtained from the power generation unit start-up and stop loss storage section 22 in FIG. Based on the stoppage loss L8TP of the power generation unit 4, the stoppage is performed from time t3 to time t4 and from time t, s to t6 in FIG.

The starting loss Ls is calculated using the following formula (section 1).

L=L+L ・・・・・・・・・・・・・・・
(10II sTRTgTP Next, based on the stoppage and start-up loss L8 calculated in the above-mentioned section, the operating unit number calculation unit 24 calculates the magnitude of the stoppage and start-up loss Ls as well as the loss n due to the change in the number of operating units in the O section, as in the previous example. After comparing and determining, the number of operating power generation units 4 that maximizes the operating efficiency of the power generation plant 5 including start-up and stop losses of the power generation units 4 is determined after processing the power section, opening section, and edge section. As a result, the number of operating power generation units 4 that maximizes the operating efficiency of the power generation plant 5 can be determined with higher precision than in the previous embodiment.

〔Effect of the invention〕

As described above, according to the present invention, in a power generation plant consisting of multiple power generation units, if an operator only sets and inputs the daily power generation plant load pattern, power generation unit start-up and stoppage losses can be calculated. It is possible to calculate the number of operating power generation units that maximizes the operating efficiency of the power generation plant.
To be able to efficiently control the operation of a power generation plant consisting of multiple power generation units.

[Brief explanation of drawings]

FIG. 1 shows an operating side of a power plant showing an embodiment of the present invention.
Figure 2 is a functional block diagram of the process computer in Figure 1, Figure 3 is a power generation unit load efficiency curve diagram, and Figure 4 is a power generation gland load/4' diagram.
FIG. 5 is a graph showing the processing in the operation number calculation section of FIG. An overall system configuration diagram of a power plant operation control device showing an example,
FIG. 8 is a functional block diagram of the process computer shown in FIG. 7, and FIG. 9 is a flowchart showing the processing in the operating number calculating section of FIG. 1... Load control device, 2... Process computer, 3.
... Data setting device, 4... Power generation unit, 5... Power generation plant, 20... Power generation unit maximum and minimum load storage section, 21... Power generation unit load efficiency storage section, 22...
- Generation unit start-up and stop loss storage section, 23... Input processing section, 24... Operating number calculation section, 25... Target operating number storage section, 26... Power generation unit stop time processing section. Figure 7 Figure 3 Figure 4 **WIA (Hr) Figure 8 Figure 9

Claims (1)

[Claims] In a power generation plant operation control device that controls starting and stopping of a plurality of power generation units according to a power generation plant load pattern inputted via a data setting device, the maximum power generation unit stored in advance as the power generation plant load no. A method for calculating the number of operating power generation units that maximizes power generation efficiency from the load, and a method for generating power generated when changing the number of operating power generation units that should be started and stopped when operating with the number of operating power generation units calculated by this means. means for calculating the efficiency loss; means for obtaining the start-up and stop losses of power generation units; means for comparing the power generation efficiency losses with the start-up and stop losses; and the number of operating power generation units based on the comparison results of the means. A power generation plant operation control device comprising means for determining.