JP2786281B2 - Power plant control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a control device for a power plant composed of a plurality of power generating units, and in particular, to collectively receive a power supply command signal from a power supply command station as a power plant. And a power plant control device for determining an output request for each power generation unit.

[Conventional technology]

For stable operation of the power system, the output of each power generation unit needs to be adjusted in accordance with a power supply command from a power supply command center.

JP-A-61-157233 shows an example of a power generation unit composed of a plurality of combined cycle power generation facilities as a power generation unit operated in accordance with a power supply command from a power supply command center. Here, a combined cycle power generation facility consisting of a gas turbine, an exhaust heat recovery boiler that generates steam using the heat held by the exhaust gas, a steam turbine, and a generator driven by the gas turbine and the steam turbine, Since the total electric output is about 100,000 kW, a plurality of combined cycle power generation facilities are operated as one power generation unit in accordance with the power supply command from the power supply command center.

Although a thermal power plant usually has a plurality of steam power generation facilities (hereinafter also referred to as power generation units) including a boiler, a turbine, and a generator, a power supply command signal from a power supply command center is given for each power generation unit. . By the way, the power generation unit is usually referred to as an N-th power plant in the case of steam power generation equipment, and a plurality of sets in the case of a combined cycle power generation unit.

[Problems to be solved by the invention]

In the above-mentioned known example, a power supply command is given to each of the power generation units from the power supply command center, and from the viewpoint of a power plant having a plurality of power generation units, the general operation is not performed. is there. To explain this in more detail, FIG. 2 shows a typical power plant facility having a plurality of power generation units, and in this example, a combined cycle power generation system comprising a plurality of power generation facilities (referred to as shafts). Units (referred to as “series”) are provided with a total of 5 sets of 2 sets (1 series and 2 series) and 3 sets of conventional coal-fired power generation units (1st, 2nd and 3rd units) as power generation units . A power station is a set of power generation units and switchgear facilities, a pure water treatment unit, a wastewater treatment unit, a fuel storage unit, a coal storage unit, a water intake unit, and other auxiliary facilities common to the above power generation units. Refers to the entire power generation facility, including

In this way, the power plant has, for example, five power generating units, each of which is operated individually as shown in FIG. That is, the power supply command signal 12 from the power supply command station 1 is individually applied to each control device 5 for each power generation unit 7 of the power plant 2, and the control device 5 controls each power generation unit 7. Power generation unit is a steam power plant 7a
In the case of (1), the control device 5 includes a load adjusting device, and exchanges the signal 10 between 5 and 7a in order to control the output of the boiler, the turbine, the generator and the like according to the power supply command signal 12. When the power generation unit is the combined cycle power generation unit 7b, the control device 5 is configured as in, for example, the above-mentioned Japanese Patent Application Laid-Open No. 61-157233, and the power supply command signal 12 is output from the series load control device 51 to the shaft load control signal 12 for each axis. '. The shaft load controller 52 adjusts the output of the gas turbine, the exhaust heat recovery boiler, the steam turbine, the generator, and the like constituting each shaft by the signal 10 so as to match the shaft load control signal 12 '. Then, for each power generation unit 7, a central operation monitoring panel 6 that monitors plant information in the unit and controls each part of the plant is provided. In the example of the power plant shown in Fig. 2, the central operation monitoring panel consists of five panels, one for each unit as shown in Fig. 3.
A board is provided.

As described above, in the conventional system, the power generation units 7 are individually controlled by the power supply command center 1, and the power plant itself does not have a function of comprehensively controlling and monitoring the power generation units in the power plant.

For this reason, the internal arithmetic processing becomes complicated because the number of power generation units managed by the power supply command center is enormous. In addition, since the power supply command is unilaterally given without considering the situation on the power generation unit side, when the power supply command cannot be satisfied, unnecessary frequency fluctuation of the power system results.

In view of the above, an object of the present invention is to provide a power plant control device that can contribute to improving the stability of a power system with a simple device.

[Means for solving the problem]

In the present invention, a power supply command is received from a power supply command station for each power station, and the load shared by each power generation unit is determined in the power station load adjustment device.

[Action]

Since the power plant load adjusting device is installed in the power plant, the output sharing to each power generation unit is determined in order to achieve the power supply command after sufficiently understanding the circumstances such as the output margin in each power generation unit.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a power supply commanding station 1, a power plant load adjusting device 3 provided in the power plant 2 in FIG. 2, and control devices 5, 5 'for each power generating unit (load control for controlling the load of each power generating unit 7). FIG. 2 is an overall configuration diagram of the present invention showing the relationship between the devices 51 and 51 ′, the power generation unit automation devices 52 and 52 ′, and the shaft load control device 53 ′).

According to the present invention, the power supply command 4 from the power supply
The power plant load adjusting device 3 receives a collective command value for two power plants composed of various types of power generating units 7 having different outputs and fuels. The load control devices 51, 51 'which manage the operation information 10, 10', 11, 11 'indicating the current operation state of each power generation unit 7 and the operation information such as the characteristics of the power generation unit 7.
Information from the automated equipment 52 and 52 '
Based on 8 ', 9,9', the optimal output sharing or operation schedule of each power generation unit 7 as a total of the power plant 2 is determined, and the load control devices 51,51 'of each power generation unit and the automatic power generation unit of each power generation unit are determined. Unit output request commands 8, 8 ', 9, 9' are given to 52, 52 '. Load control devices 51, 51 'for each power generation unit and automation devices 52, 52' for the power generation units
Is based on the demand command 8,8 ', 9,9'
And the power generation unit 7 is operated.

On the other hand, the central operation monitoring device 6 is provided for each power generation unit, and information indicating the operation state of the power generation unit is displayed, and the operator monitors the plant. Further, an operation signal, a permission signal, and the like by an operator are given to the control devices 5, 5 'via the central operation monitoring device 6, and the plant is operated.

FIG. 4 shows the flow of information in FIG. 1 in the case of the steam power plant 7a. In FIG. 4, the power supply command 4 given from the power supply command station 1 to the power plant load adjusting device 3 is a load request command, an AFC (Automatic Frequency Control) command, or a reactive power command that is instantaneous every unit of the power plant. Or a load notice command, a reactive power notice command, or an operation number notice command.

Each of the steam power generation units 7a receives power from the load control device 51 or the automation device 52 of each power generation unit in the power plant load adjustment device 3 based on the power supply command 4 (power plant load request command, AFC command, reactive power command). Thermal efficiency characteristics that affect output adjustment of each power generation unit (No. 2) are used as power generation unit operation information 82, 92 to determine the optimal output sharing and operation schedule of the power generation unit as a whole.
10), permissible load change rate characteristics (Fig. 11),
Lower limit value characteristics (Fig. 12), permissible load fluctuation rate characteristics (number of load fluctuations per unit time, Fig. 13), permissible load sudden change fluctuation width characteristics (Fig. 14), equipment life consumption rate, generator invalidity Power operation permissible characteristics (Fig. 15), current operation status (power generation output, reactive power), status information of the power generation unit as "running / starting" or "stopping / stopping" are transmitted to the power plant load adjusting device 3. Given. These characteristics will be described in detail later, but are prepared in advance as individual characteristics for each power generation unit, and are modified as needed each time.

Based on this information, the power plant load adjusting device 3 determines the output sharing and operation schedule of each power generation unit that are optimal as a total for the power plant within the allowable operation limit of each power generation unit, and determines the load control device of each power generation unit. 51,5
A power generation unit output sharing command 81 and an operation schedule 91 are given to 1 'or the automatic devices 52, 52' of each power generation unit.

Reply information from power plant load adjustment device 3 to power supply command center 1
The contents of 13 include, when the power plant is not allowed for the power supply command 4, the allowable values of the power plant, the feasible load fluctuation range, the feasible reactive power, the feasible operation schedule, and the feasible operation schedule. It is the number of movable units.

FIG. 5 is a diagram for explaining the case of a combined cycle power generation unit. Since the combined cycle power generation unit 7b is composed of a plurality of power generation facilities (referred to as shafts), a load control device is provided between each shaft and the power plant load adjustment device 3 as an overall control of each shaft.
There is a 51 'and an automation device 52'. The load control device 51 'and the automation device 52' receive the output sharing command 81 'and the operation schedule command 91' as a series determined by the power plant load adjusting device 3, and receive a sharing command 10 'for each axis which is optimal as a series.
a or the schedule 11'a is sent to the axis controller 53 '. On the other hand, data 10'b and 11'b similar to the information from the power generating unit in FIG. 4 are used as information for determining the optimal power sharing of the power generating unit as a power plant and the optimal shaft power sharing as a series. Given from each axis.

FIG. 6 is a diagram showing functions of the power plant load adjusting device 3 in FIG. The current power plant actual state value or the scheduled power plant actual state value B after a certain time with respect to the power supply command value A such as the output request command and the output notice command as a power station batch
(AB) is calculated by the processing block 31. The deviation (AB) is within the allowable value C of each power generation unit of the power plant and the system is stopped or started up so as to be optimal as a total of the power plant. The processing block 32 optimally distributes power to the power generation units that can be allocated, excluding power generation units on the way, and gives the distribution values + Δ ₁ , + Δ ₂ ,..., + Δ _N of each power generation unit as command values to each power generation unit. In this case, the command values + Δ ₁ , + Δ ₂ ,
..., + delta if tracking can not power Yunitsuto has been made with respect to _N, with the exception of not catch up power Yunitsuto, redistributed so that the allowable values in a and optimal allocation to distributable power Yunitsuto, again the The distribution value is given to each power generation unit as a command value. Even if the deviation (AB) is optimally distributed as described above, the power cannot be absorbed as a total of the power plant and exceeds the allowable value of the power generation unit. Information such as output notice
13 (FIGS. 1 and 4) will be returned to the power supply command station 1. The method of determining the optimal distribution to each power generation unit as a total of the power plants will be described with reference to FIGS. 7 to 9. I do.

Prior to this, the power supply commands given from the power supply command station 1 to the power plant load adjusting device 3 are classified into several types.
As shown in Fig. 16, one that requires the power generation unit to follow in a long-term order of several tens of minutes or more (usually called the economic load distribution signal ELD), one that requires the power generation unit to follow in the minute order (usually automatic A frequency adjustment signal AFC), which instructs the adjustment of the active power of the power generation unit while the former two instruct the adjustment of the reactive power of the power plant (usually an automatic reactive power adjustment signal AQC In the former two, the mechanical input of the generator is adjusted, whereas the field input of the generator is adjusted). Note that the notice command includes a command for instructing a load to be reached by the power generation unit at a predetermined time (usually included in a part of the ELD signal) and a command for instructing a scheduled start / stop of the power generation unit. .

Since the power supply commands are classified as described above and have different characteristics, the viewpoints in distributing the load to the power generation units, that is, the evaluation items are different. For example, the ELD signal
Once the load is set, it is assumed that the load will be operated at the same load for a long period of time.Therefore, it is better to take the thermal efficiency of the entire power plant as an evaluation item and distribute the load to maximize this. . As a constraint to achieve this, when the ELD is given as a load increase / decrease range, the allowable load change rate, allowable load upper / lower limit value, allowable load change rate, and equipment life consumption rate of each power generation unit should be considered. Therefore, the distribution (maximum thermal efficiency) of the evaluation item should be allocated within the allowable value. Also, when the ELD is given as a load notice command, distribution is performed in consideration of the same constraint conditions. Next, since the AFC signal frequently fluctuates on the order of minutes, load distribution must be performed from the viewpoint of whether or not the power generation unit itself can withstand this fluctuation. The margin of the allowable load fluctuation rate with respect to the actual value is used as an evaluation item, and the load is distributed to optimize this. As a constraint in this case, the allowable load fluctuation range and the life consumption rate of the device should be considered. In the case of the AQC signal, since there is a limit to the reactive power that the generator can take, the difference between the current operating reactive power value and the reactive power allowable value (reactive power margin) is used as an evaluation item, and the load distribution is performed accordingly. At this time, low excitation and overexcitation restrictions on the generator operation permissible characteristics of each power generation unit are set as constraints. Hereinafter, a specific distribution method will be described.

FIG. 7 shows a case where a load request command A '(ELD signal) for increasing / decreasing the load of the power plant 2 as a whole is received from the power supply command station 1. The deviation (A'-B ') between the load request command value A' and the power plant actual state value B 'is compared by 100. If the difference is not positive, the generator unit which is being stopped or being started is detected at 101. Of the power generation units excluded, the allowable load change rate, allowable load upper / lower limit value, allowable load fluctuation rate, equipment life consumption rate, and the allowable efficiency of each power generation unit shown in FIG. The order with the smallest change rate (that is,
The distribution value of the deviation (A'-B ') is determined preferentially from the lowering of the thermal efficiency when the output of the power generation unit is reduced). If the deviation (A'-B ') is positive, the order in which the rate of change of the thermal efficiency is the largest within the allowable value of the constraints of the power generation unit in 102 is the same as above (that is, the output of the power generation unit is increased). (A'-B ') preferentially because of the largest increase in thermal efficiency when it is performed)
Is determined.

To explain this determination method in more detail, the load distribution is performed so as to maximize the thermal efficiency, but the thermal efficiency differs depending on the power generation unit load as shown in Fig. 10, and in the case of steam power generation, as shown in Fig. 7a. The larger the efficiency, the higher the efficiency tends to be. In combined power generation, if the number of shafts is controlled,
It shows a tendency like 7b. Although the characteristics of the thermal efficiency with respect to the load are as shown in FIG. 10, the efficiency values of the respective power generation units are generally different even if the power generation units are of the same type. This is the same in FIGS. 11 to 15 described below. In short, these characteristics are prepared for five power generation units. Looking only at Fig. 10, it seems that it is sufficient to distribute a large amount of load to the combined cycle unit.However, it is considered that this combined cycle unit is often operated at the rated load. It may not be possible. Therefore, the following constraints are further considered for each power generation unit. The examination as to whether or not the constraint conditions can be observed is performed in order from the power generation unit having the highest thermal efficiency. Therefore, if the predetermined load requirement can be achieved with, for example, three units having high thermal efficiency, the load distribution is not performed for the remaining two units.

I. Load change rate characteristics of power generation unit FIG. 11 is a diagram showing load change rate characteristics of the power generation unit. The unchangeable rate has a characteristic of changing differently depending on the magnitude of each load for each power generation unit. The characteristic 7a of the steam power generation unit in the figure is 1-2% /
This indicates that operation can be performed at a load change rate of about 3 to 5% / min when the load is higher than the minimum load, and operation at a load change rate higher than this is not preferable. Characteristic 7b is the load change rate of the combined power generation unit. For example, when the load is 40% or more, 10% /
Although the rate of change can be as high as a minute, the rate of change of load is kept low for loads less than that. Using the characteristics shown in FIG. 11, it is determined whether or not there is a unit in which the power generation unit selected from the viewpoint of thermal efficiency can quickly respond to the power supply command.

II. Upper and lower limit of allowable load of power generation unit The steam power generation unit consists of multiple systems for supplying air, water, and fuel to the boiler in parallel,
The operation can be continued even if part of the operation stops. For example, regarding the coal supply system of the steam power generation unit, for example, there are four coal mills (hereinafter referred to as auxiliary machines),
0 to 35% for one accessory, 70 to 0% for two, 90 for three
Up to 25%, four units can operate at 100-50% load.
Fig. 12 is a simplified diagram showing only the relationship between the number of coal mills and the allowable load upper and lower limits. However, in the actual steam power generation unit, other auxiliary equipment such as a fan for air supply and a water supply pump , A feed water heater, etc., and the characteristics shown in FIG. 12 are actually expressed as a composite characteristic of these individual accessory characteristics. In the case of a combined power generation unit, the characteristics shown in Fig. 12 are determined by the number of axes of the combined power generation unit, in addition to the upper and lower limits determined by the number of feed water pumps and feed water heaters. According to this characteristic, it is necessary to start the fourth generation coal mill when trying to load 100% of this power generation unit load while operating at a load of 50% with three coal mills, considering the time required for startup. The limit that can respond quickly to the power supply command is up to 90% load. Using the characteristics shown in FIG. 12, it is determined whether or not the power generation unit selected from the viewpoint of thermal efficiency is a unit that can quickly respond to the power supply command, and if not, how far it can respond.

III. Permissible load fluctuation rate of power generation unit Fig. 13 is a diagram showing allowable load fluctuation rate characteristics of the power generation unit. If the ratio of the integrated value of the number of load changes in the output operation to the integrated value of the output operation time of each power generation unit is calculated, the load fluctuation rate always indicates the average value in the output operation, and the equipment life of the power generation unit The number of years greatly depends on the number of load changes, but when a single load change is observed, the degree of equipment life and wear varies depending on the magnitude of the load change. Therefore, the number of load changes is corrected by the magnitude of the load change. In contrast to the permissible load change rate characteristic (a) obtained based on the obtained number of load changes, if the actual operation load change rate characteristic up to the present time is represented by (b), the permissible load change of the load change rate at the current time The number of times is (ab). Therefore, in response to the command to the power generation unit, the load fluctuation rate at the current time exceeds the allowable load fluctuation rate characteristic, and the power generation unit in the load change restriction area does not change load to return to the normal operation area. It will be entrusted to another power generation unit that has enough time. From the above point of view, load change may not be allowed even for the power generation unit selected for thermal efficiency.

IV.Equipment life consumption rate Although not specifically shown, for example, the life consumption rate of these equipment is obtained based on the thermal stress of the high-temperature metal part of a steam turbine or a gas turbine, and this is used as a constraint condition when the load changes. .

In the present invention, when the economic load distribution signal ELD is received, the load is distributed so as to maximize the thermal efficiency. This specific example will be described with reference to FIG. However, FIG.
(C) shows the thermal efficiency characteristics of each of the first to third units, where the current loads are X, Y, and Z, respectively.

When (A'-B ')> 0 The change rates of the thermal efficiency at the current operation output of the first to third units are α, β, γ, and it is assumed that α <β <γ.

Deviation Δ between middle supply command A 'and current power plant total output B'
First, KW (= A'-B ') is distributed to the Unit 3 having the largest rate of change in thermal efficiency. (However, requests that exceed the rated output will not be made. If there is a request that exceeds the rated output, the portion that could not be allocated will be allocated to Unit 2 with the next largest rate of change in thermal efficiency. .) When the rate of change γ ′ in thermal efficiency at the output (Z + ΔKW) as a result of allocating ΔKW to Unit 3 is smaller than the rate of change β in thermal efficiency of Unit 2, a part ΔK of the value ΔKW allocated to Unit 3
W '(difference between output corresponding to intersection a of tangent line of γ and γ')
To Unit 2. At this time, the thermal efficiency change rate β 'at (Y + ΔKW') and the output Z + (ΔKW '
+ ΔKW ′) is assumed to be γ ″. Γ ″
In the case of <β ′, allocation calculation is performed and determined in the same manner as described above. When γ ″> β ′, the difference ΔKW ″ between the output Y + (ΔKW′−ΔKW ″) corresponding to the intersection b of the tangent line between β and β ′ of the second unit is returned to the third unit, and similarly the rate of change of the thermal efficiency The same calculation is repeated in the same manner. For example, when the adjustment amount becomes 1 MW or less, the process is terminated and the final distribution value is determined.

The same is calculated for the other units (Unit 1) below,
Determine the optimal distribution value.

When (A'-B ') <0 When (A'-B')> 0, the means for calculating the optimal allocation value is the same, but in the case of (A'-B ') <0, In the case of (A'-B ')> 0, the deviation .DELTA.KW between the middle supply command A' and the current total power plant output B 'is negative, and the distribution value of the decrease is determined. Unlike this, the decrease distribution value is determined in ascending order of the rate of change in thermal efficiency.

The distribution in the power plant load adjusting device when the economic load distribution signal ELD is input in FIG. 7 is determined as described above, but the current output is maintained for the determined distribution value due to a failure or the like. When a power generation unit that cannot be neglected occurs, the load distribution value of each power generation unit is redistributed in the same manner as described above so that the total thermal efficiency of the power generation station among the power generation units that can be distributed excluding this power generation unit is the highest. Through the above process, it is determined at 103 that the determined load has been distributed to each of the power generating units, and as a result, the deviation (A'-
If B ′) is completely absorbed, it is determined at 104 that the indivisible component is zero, and that it is possible to follow the power supply command, and the deviation (A′−
If all of B ') are not absorbed, the executable load value of the power plant is returned to the power supply command station 1 at 105. Next, when the ELD signal issued from the power supply dispatching station is a load notice command (including a command for the number of operating units of the power generation units), the method for determining the optimal operation schedule of each power generation unit in response to this is basically Is performed in the same manner as in the method of determining the load sharing of each power generation unit in response to the load change request command.

FIG. 8 shows a case where an AFC command for the entire power plant is received from the power supply command station 1. The deviation (A "-B") between the load fluctuation width (A ") of the AFC command value and the actual state value (B") of the power plant is determined at 106 by the power generation unit which is stopped or being started. The current load fluctuation rate actual value obtained from Fig. 13 within the allowable load sudden change fluctuation range shown in Fig. On the other hand, the distribution value of the deviation (A "-B") is determined preferentially in the order of the power generation units having the largest allowable load fluctuation rate. If there is a power generation unit that has to maintain the current operation due to a failure or the like with respect to the determined distribution value, redistribution is performed among the power generation units that can be allocated, excluding this power generation unit. Here, the evaluation item for optimal load distribution with respect to the AFC directive is the allowable load fluctuation rate margin.Distributing loads in descending order of the margin means managing the number of load changes with respect to the operation time of each power generation unit. It is to be. This is based on the idea of operating the power generation unit so that its life will be attained at the service life set for the power generation unit. In other words, the operation is such that all the power generation units have a uniform life consumption. FIG. 14 is a diagram showing allowable load sudden change fluctuation width characteristics of the power generation unit. The allowable load sudden change fluctuation characteristic changes depending on the magnitude of the load of the power generation unit, and the characteristic is larger in the upper and lower limits in the high load band than in the low load band.

It is confirmed at 107 that the distribution to each of the power generation units determined through the above-described process has been performed. As a result, when all the deviations (A "-B") have been absorbed, the non-adjustable components are determined at 108. Zero, it is determined that the power supply command can be followed, and if all the deviations (A "-B") are not absorbed, in 109, the portion that cannot be absorbed is regarded as an unadjustable component and the executable load fluctuation range of the power plant is determined by the power supply command station. Reply to

FIG. 9 shows a case where a reactive power command for the entire power plant is received from the power supply command station. The difference (A−B) between the reactive power command value (A) and the actual state value (B) of the power plant is calculated at 110 in the power generation unit excluding the power generation unit that is being stopped or being started. And the current values of the generators of each generator unit within the allowable range of the reactive power operation within the overexcitation limit and the lower excitation limit on the allowable operation characteristics of the generator of each generator unit shown in Fig. 15 The margin is determined by the difference between the operating reactive power value and the reactive power allowable value,
The distribution value of the deviation (A−B) is determined preferentially in the order of the power generation units having the largest margin and so that the margins of the respective power generation units become equal. This distribution is
The difference between the current operating reactive power value of the generator of each power generation unit and the reactive power allowable value is urged as a margin, and the power units with the largest margin are prioritized and the margin of each power unit is averaged. Is determined as follows.

FIG. 15 is a view showing a generator reactive power operation allowable characteristic of the power generation unit. The reactive power operation permissible characteristic of the generator of each generator unit is based on the generator active permissible characteristics depending on the active power and the reactive power of the generator. The range is within the characteristic indicated by the curve.

Within this range, when the reactive power at the current operating point is (d) and the permissible reactive power at this time is (c), the margin ratio is (%) Is represented by

It is confirmed at 111 that the distribution to each of the power generation units determined through the above-described process is completed. As a result, if all the deviations (AB) have been absorbed, at 112, the unadjustable component is zero, and the power is supplied. It is determined that the command can be followed, and the deviation (A-
B) If all power is not absorbed, the reactive power value executable at the power station is returned to the power supply command point at 113.

The method of determining the optimum operation schedule of each power generation unit in response to the reactive power notice command (including the number of operating units of the power generation units) issued from the power supply command center is also a method of determining the allocation to each power generation unit in response to the reactive power request command. Do the same, but to determine the driving schedule within a certain period,
As the allowable value of the constraint condition of each power generation unit, the generator reactive power operation allowable characteristic and the characteristic of the power generation unit shown in FIG. 15 are used so that the determination of the reactive power fluctuation can be made.

In the operation schedule of each power generation unit obtained in this manner, the portion of the power plant as a whole that cannot be absorbed by the power supply command is returned as a non-adjustable portion to the power supply command center with the executable operation schedule of the power plant and the number of scheduled power generation units. I do.

〔The invention's effect〕

According to the present invention having the above-mentioned power plant load adjusting device, the power supply command from the power supply commanding station is received by the power plant load adjusting device as a collective power plant command, and the output sharing of each power generating unit is performed based on the operation information of each power generating unit. Is determined, optimal operation as a power plant can be performed, and system operability can be greatly improved.

The effects of the present invention will be described with reference to FIGS. 17 and 18. First, FIG. 17 is a diagram for explaining a power supply command and a corresponding result of each power generation unit in the prior art. The power supply command 12 is sent for each power generation unit. In the first power generation unit, the power supply command can be operated in accordance with the power supply command from the operating state. In the No. 2 power generation unit, the operation cannot be performed because the power supply command is exceeded. In the No. N power generation unit, since the power supply command has a margin with respect to the allowable value, the operation is such that the power supply command can be observed. However, the power plant as a whole will not be able to observe the power supply command.

FIG. 18 is a diagram for explaining the result of the correspondence between the power supply command 4 and each power generation unit in the present invention. The power supply command value 4 is sent to the power plant load adjustment device 3 in a lump at the power plant, and the optimal sharing is determined according to the operation status of each power generation unit based on the operation information of each power generation unit. , 2
In each of the power generation units of the No. N power generation unit and the No. N power generation unit, the operation is performed within the allowable value of each power generation unit and in compliance with the power supply command even in the power station as a whole.

As described above, when viewed from the whole power plant, the same power supply command value cannot be protected by the conventional technology, but can be protected by the present invention. As a result, it is optimal for each power generation unit group of the power plant and can greatly contribute to improvement of system operability.

In addition, the conventional mid-sales operation has a one-to-one correspondence with the power generation unit.
I don't know the situation. ) If the power generation unit was unable to respond to this, the excess or deficiency was provided to other power generation units, and adjustments were made to optimize the system operation.

The middle supply operation according to the present invention has a one-to-one correspondence with the power plant, and exchanges of signals (output commands, output values, etc.) with the power plant are smaller than before, and the output of each power generation unit of the power plant is reduced. The distribution can be freely determined by the power plant, and therefore, by adjusting the output distribution among the power generation units in response to the middle supply instruction, operation can be performed that satisfies the middle supply instruction as compared with the conventional case.
In addition, since the data to be managed in the power generation unit is also reduced for the middle salary, it is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a control system according to the present invention, FIG. 2 is a diagram showing a typical power plant configuration, and FIG. 3 is a control system showing the relationship between a conventional power supply command station and a control device in the power plant. FIG. 4, FIG. 4 is an explanatory diagram of signals transmitted and received between units in the case of a steam power generation unit, FIG. 5 is an explanatory diagram of signals transmitted and received between units in the case of a combined power generation unit, and FIG. FIG. 7 is a diagram for explaining power supply command distribution in the power plant load adjustment device 3, and FIG.
Fig. 8, Fig. 8 and Fig. 9 show that the power supply command is ELD signal, AFC signal,
Fig. 10 to Fig. 15 show the power supply command distribution when the signal is an AQC signal. Fig. 10 to Fig. 15 show the thermal efficiency characteristics, load change rate characteristics, allowable load upper and lower limit value characteristics, load change integration frequency characteristics, Diagram showing sudden load fluctuation characteristics and reactive power characteristics. Fig. 16 shows the relationship between the type of power supply command and the evaluation items and constraints at that time. Fig. 17 shows that the conventional system cannot comply with the power supply command. FIG. 18 illustrates that a power generation unit occurs, FIG. 18 illustrates that the power supply command can be complied with by receiving the power supply command in a lump, and FIG. 19 illustrates a specific method of power supply command distribution. It is. 1 ... power supply command station, 2 ... power station, 3 ... power station load adjustment device, 4 ... power supply command, 5 ... control device, 7 ... power generation unit, 8, 9 ... power generation unit output distribution command And driving information, 10, 11 ... driving information, 13 ... reply information.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-117435 (JP, A) JP-A-58-207826 (JP, A) JP-A-63-277428 (JP, A) JP-A 61-117 285029 (JP, A) Japanese Utility Model Showa 58-97943 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02J 3/38 H02J 3/46

Claims (8)

(57) [Claims] 1. A plurality of power generating units, a control device provided for each of the power generating units, and an operating state of each of the power generating units provided for each of the power generating units, and to the power generating unit via the control device. In a power plant equipped with a central operation monitoring device that provides operation signals and operating the power generation unit in accordance with the power supply command from the power supply command center, each power supply unit receives a power supply command to be achieved as a power plant from the power supply command center. A power plant control device comprising a power plant load adjusting device that calculates an achievable load and distributes the load to each power generation unit. 2. A plurality of power generating units, a control device provided for each of the power generating units, and an operating state of each of the power generating units provided for each of the power generating units, and to the power generating unit via the control device. In a power plant equipped with a central operation monitoring device that gives operation signals and in which the power generation unit is operated in accordance with the power supply command from the power supply command center, the power supply command center receives the power supply command to be achieved from the power supply command station, and the type of power supply command A power plant control device comprising: a power plant load adjusting device that calculates a load of each power generation unit to optimize an evaluation item according to the power generation unit and distributes the load to each power generation unit. 3. A plurality of power generation units, a control device provided for each of the power generation units, and an operation state of each of the power generation units are provided for each of the power generation units, and the operation state of the power generation unit is displayed via the control device. In a power plant equipped with a central operation monitoring device that gives operation signals and in which the power generation unit is operated in accordance with the power supply command from the power supply dispatching station, an economic load distribution signal is received from the power dispatching station as a power supply command to be achieved as a power plant. A power plant control device comprising a power plant load adjusting device that calculates the load of each power generation unit to maximize thermal efficiency and distributes the load to each power generation unit. 4. A plurality of power generation units, a control device provided for each power generation unit, and an operation state of each power generation unit provided for each power generation unit, and to the power generation unit via the control device. In a power plant equipped with a central operation monitoring device that provides operation signals and in which the power generation unit is operated in accordance with the power supply command from the power supply control center, an automatic frequency adjustment signal is received from the power supply control center as a power supply command to be achieved as a power plant. A power plant control device comprising: a power plant load adjusting device that calculates a load of each power generation unit and distributes the load to each power generation unit so as to equalize an allowable load fluctuation rate margin of each power generation unit. 5. A plurality of power generation units, a control device provided for each of the power generation units, and an operation state of each of the power generation units provided for each of the power generation units, and to the power generation unit via the control device. In a power plant equipped with a central operation monitoring device that gives operation signals and the power generation unit is operated according to the power supply command from the power supply command center, an automatic reactive power adjustment signal is supplied from the power supply command center as a power supply command to be achieved as a power plant. A power plant control device comprising: a power plant load adjusting device that calculates a load of each power generation unit and distributes the load to each power generation unit so as to equalize a reactive power margin of each power generation unit. 6. A plurality of power generating units, a control device provided for each of the power generating units, and an operating state of each of the power generating units provided for each of the power generating units, and to the power generating unit via the control device. A power supply command station that issues a collective power supply command to be achieved as a power plant to a power plant having a central operation monitoring device that provides operation signals. 7. A plurality of power generation units, a control device provided for each of the power generation units, and an operation state of the power generation unit provided for each of the power generation units, and to the power generation unit via the control device. Supply a collective power supply command to be achieved as a power plant to a power plant equipped with a central operation monitoring device that gives operation signals, and distribute power to each power generation unit in consideration of the operating state of each power generation unit on the power plant side Command system. 8. A plurality of power generation units, a control device provided for each of the power generation units, and an operation state provided for each of the power generation units to display an operation state of the power generation unit, and to the power generation unit via the control device. A power supply command center issues a collective power supply command to be achieved as a power plant from a power supply command station to a power plant having a central operation monitoring device that provides an operation signal, and the power plant load adjustment device provided in the power plant issues the collective power supply command. A power supply system that distributes power to each power generation unit in consideration of the operation state of each power generation unit, and notifies the power supply command center when the power supply command cannot be achieved as a power station.