JP2001086649A - Load frequency controlling method in power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control various kinds of generators connected to a power system according to respective load frequency control(LFC) adjusting abilities, by allotting a control demand for generated output of each generator by a specified electric energy value determined for each generator in order from a generator of the highest priority order. SOLUTION: In an output command controlling element 20, a frequency detector 21 is connected to an input terminal of a load frequency controller(LFC) 22, and the difference between a frequency in an electric circuit 7 and a reference frequency is detected and applied to the LFC 22. The output terminals 21A of the LFC 22 are connected to the control input terminals of a group of hydraulic generators 4 and a group of thermal generators 5 as objects of load frequency control. In respect of a priority order, a generator having a higher output changing speed is given priority, and an electric energy value is allotted. Consequently, control which follows demand variations swiftly becomes feasible, so not only prevention of overcontrol but also economical frequency control of a power system become feasible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load frequency control method in a power system.

[0002]

2. Description of the Related Art In an electric power system of an electric power company, electric power is supplied from power generators provided at nuclear power plants, thermal power plants, hydroelectric power plants (including pumped-storage power plants), and the like. Of these power supplies, other than the nuclear power plant, the other power supplies respond to fluctuations in power consumption of loads consuming power, that is, fluctuations in demand, and adjust the output based on the supply control signal from the central power dispatching center. It is carried out. By this output adjustment, the balance between the power supplied from each power supply and the demand power is maintained, and the frequency of the power system is maintained within a predetermined deviation from a reference value (50 Hz or 60 Hz). The following two control signals are mainly used as supply control signals for controlling the supply power to be increased or decreased in accordance with the increase or decrease in the demand power and the frequency of the power system to be maintained within a predetermined deviation of the reference value. . One is a load frequency control signal (hereinafter referred to as an LFC signal) for controlling the output of each generator in response to a demand fluctuation in which the fluctuation period is several minutes to several tens of minutes and the fluctuation width is not so large. , LFC is Load Freuency Co
ntrol).

[0003] LFC refers to controlling the output of a generator so that the frequency does not deviate from a predetermined range of a reference frequency due to an increase or decrease in load power demand. Another control signal is an economic load distribution control signal (hereinafter referred to as an EDC signal) intended to control the output of each generator in response to a large demand fluctuation in a longer cycle than the LFC signal targets. , EDC
Is an acronym for Economic load Dispatching Control). For small-scale demand fluctuations with a period of several minutes or less shorter than the target of the LFC signal, the GF (governor-free) function provided in each generator automatically generates power in response to frequency fluctuations in the power system. Controlling the output of the machine. In the operation of the power system, by utilizing each of these control functions, the output of the generator is controlled according to the fluctuation of demand in the power system, and the frequency of the power system is within a predetermined deviation from a reference value. I keep it.

[0004] Thermal power generators (hereinafter referred to as "thermal power generators") have a mainstream power of 400 MW until the early 1960s.
In recent years, many once-through boilers with larger capacities have been connected to the system in place of drum boilers up to a certain extent. A drum boiler machine has a drum in a plant, and since this drum serves as a buffer for heat capacity, it is possible to maintain an output that has increased or decreased in response to a change in frequency for a certain period of time. On the other hand, in a once-through boiler, water is directly converted into steam in a steam pipe and sent to a superheater / turbine. For this reason, the heat capacity is smaller than that of the drum boiler machine, and when the output is increased, the time during which the output can be maintained is relatively short, and is reduced in a few minutes.

[0005] In the time range in which the output of the once-through boiler machine decreases, the output is controlled by the GF function. The influence of such characteristics of the once-through boiler machine on the frequency fluctuation of the power system increases as the usage ratio of the once-through boiler machine in the system increases. That is, if the frequency drop continues for a certain period of time,
The GF function cannot sufficiently cope with a relatively long cycle variation in the cycle range to be dealt with. For this reason, output fluctuation occurs in a cycle that cannot be controlled by the GF function or the LFC, which is one of the causes of the system frequency being disturbed. Therefore, in recent frequency control, GF
Also covers output fluctuations in the periodic range where functions are shared
It is necessary to perform LFC, and a frequency control method that can respond at high speed in this cycle range is required.

[0006] The conventional LFC can be further subdivided into constant frequency control (hereinafter abbreviated as FFC, an acronym for Flat Frequency Control) and frequency-biased interconnection flow control (hereinafter abbreviated as TBC, an acronym for Tie line Bias Control). ). The FFC is a control that detects a deviation (ΔF) of the frequency from the reference value as described above, and adjusts the generator output so as to reduce the deviation ΔF to keep the frequency of the power system constant. . The TBC detects the deviation ΔF and an interconnecting line flow change (ΔPt) indicating the exchange of electric power with another electric power system (for example, electric power systems of a plurality of other electric power companies) and detects the frequency from these. The power required for constant control (hereinafter referred to as a required control amount) is calculated, and the output of the generator is adjusted according to the required control amount.

[0007] It is known that the response delay time to the LFC signal and the output change speed of each generator, which is a control target for keeping the frequency of the power system constant, differ depending on each generator. This means that, for example, when the deviation of the system frequency from the reference frequency becomes large and the output control is performed on the generator using the LFC signal, the output of the generator with a low output change speed or a long response delay time May act to increase the supply-demand imbalance.
That is, the output fluctuation of the generator that does not properly follow the demand fluctuation causes disturbance in the frequency of the system. Therefore, in system operation, it is desirable to use a generator that has a good response to fluctuations in demand. If the output of the generator can be controlled promptly, the generator can be controlled to immediately supply the power corresponding to the fluctuation when the demand fluctuates, and the supply and demand can be easily balanced. Can be.

FIG. 5 is a graph of actually measured values showing an example in which a generator having a slow LFC response adversely affects frequency control in a normal operation of a certain power system. In FIG. 5, the horizontal axis is time. The scale on the right side of the vertical axis is the frequency deviation Δf (Hz) of the system, and its change is shown by a solid line graph. The scale on the left side of the vertical axis indicates the generator output (M
W: megawatts) and a command value (MW). The dashed line indicates the actual output of the generator A having a long response delay time, and the two-dot chain line indicates the actual output of the generator B having a short response delay time. A dotted line a is a command value of the generator A, and a dotted line b is a command value of the generator B. In this example, the output of the generator B having a short response delay time is decreasing after 12:07:30 (arrow A in the figure) after the frequency deviation increases in the positive direction and a down pulse is output. Nevertheless, generator A with a long response delay time
Is increasing the output as shown by the dashed line. Such a state may further increase the frequency deviation Δf.

[0009]

In the conventional LFC, the same control signal (output increase signal or output decrease signal) is simultaneously sent to all the generators to be subjected to the LFC. For example, even when a required control amount is distributed to each LFC target generator at a predetermined ratio and an LFC signal corresponding to the control amount is transmitted, the LFC signal is transmitted to all the LFC target generators. For this reason, the ability of the generator having a high LFC adjustment capability, that is, the generator having a fast output change speed or a short response delay time, is not sufficiently utilized, which adversely affects the frequency adjustment. If a generator having a high LFC adjustment capability is used in preference to a generator having a low LFC adjustment capability, high-speed control becomes possible, and the deviation from the reference frequency can be further reduced. However, this has not been the case in the past.

It is known from actual measurements that, depending on the type of thermal power unit, if the output is changed so as to follow the LFC signal, the efficiency is reduced and the economic efficiency is deteriorated even if the total power generation is the same. . In LFC, it is possible to improve the economics by maximizing the use of the type of thermal power plant with high LFC adjustment capability and operating the thermal power unit with low LFC adjustment capability at a constant output. I didn't.

Further, sending the LFC signal to all the generators has a problem from the viewpoint of coordination with economic load distribution control (EDC). Without considering the control state of the generator, for example, if the power generation is increasing by EDC and the control (reverse control) is performed to reduce the power generation by LFC, economical load In addition to hindering the distribution, the response of the generator may be delayed.

Furthermore, from the viewpoint of securing the required control amount, if LFC is performed without considering the control state of the generator, the upper and lower margins of the LFC adjustment capacity, which indicates the margin of power that can be increased or decreased, are biased. Either one of the LFC adjustment capacities may be insufficient. An object of the present invention is to provide a load frequency control method for controlling various generators connected to an electric power system according to their LFC adjustment capabilities.

[0013]

A load frequency control method in a power system according to the present invention detects a change in a system frequency and a power flow in an interconnecting line caused by a fluctuation in power consumption in a power system to which many generators are connected. And the reference frequency (50
Hz or 60 Hz), or a step of calculating a power control required amount required to compensate for the fluctuation of the power consumption when the deviation or the supply and demand unbalance amount is equal to or more than a predetermined value. Setting a priority order for each generator to be controlled according to the control characteristic of the generated power unique to each generator and the control state of the generated power of each generator; There is a step of allocating a predetermined power value determined for each generator in order from the generator. By allocating the required control amount to each generator according to the respective control characteristics and control state, a generator with good control characteristics, that is, a high LFC adjustment capability is utilized, and the accuracy of frequency adjustment is improved. .

According to another aspect of the present invention, there is provided a load frequency control method in a power system, in a power system to which a number of generators are connected, detecting a change in a system frequency and an interconnecting line flow caused by a change in power consumption. A step of obtaining a deviation from a reference frequency (50 Hz or 60 Hz) or a supply / demand imbalance amount, and calculating a power control required amount necessary to compensate for the fluctuation of the power consumption when the deviation or the supply / demand imbalance amount is a predetermined value or more. Generating a load frequency control signal (hereinafter, referred to as an LFC signal) for instructing an increase or decrease of the generated power of the generator in accordance with the control required amount, and a step of generating in advance for each generator receiving the LFC signal. Each generator is provided with the response delay based on at least one of the measured response delay time to the LFC signal and the rate of change of the generated power. Setting a first priority order in which the order of time increases from shortest to longest, and setting a second priority order in which the order of change in the generated power changes from slow to fast By summing the first and second priorities, the higher the total priority of the generator, the larger the allocated amount of the required control amount for compensating for the fluctuation of the power consumption, which is instructed by the application of the LFC signal. The lower the total priority of the generator, the smaller the allocated amount of the required control amount or the less the allocated amount.

Considering the control characteristics of each generator,
For power generators with high priority of change suitable for LFC and output change speed and generators with fast response delay time, allocated amount of control required is increased, and power generation with low output change speed and long response delay time Reduce the amount of control required for the machine or do not allocate it at all. As a result, when the power consumption fluctuates, the generator having a high output change speed and a short response delay time promptly compensates for the fluctuation in the power consumption, thereby enabling high-precision control to quickly follow the demand fluctuation. Since generators that are not suitable for LFC are excluded from LFC, overcontrol and hunting in LFC can be prevented. Since the output of the generator that does not receive LFC is maintained at the rated value, it can be operated with high efficiency and economic operation can be performed.

Further, since the power consumption fluctuation is promptly compensated for by a generator having a high output change speed and a short LFC response delay time, the GF function can sufficiently cope with a relatively long cycle fluctuation in a cycle range to be handled by the GF function. be able to.

BEST MODE FOR CARRYING OUT THE INVENTION

A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing an example of a power system to which a load frequency control method according to the present invention is applied. The power system to which the present invention is applied is not limited to the one shown in FIG. 1, but is also applicable to an interconnecting power system in which power systems of a plurality of power companies are connected. FIG.
Shows a frequency control system that controls each generator using an LFC signal and an EDC signal from the output command control unit 20 of the central power supply command center. FIG. 2 is a flowchart showing each step of the load frequency control method of the present invention. In FIG.
The power system 1 is a system connecting the power generation unit 2 and a customer, that is, a load 8. This system includes a nuclear power generator group 3, a hydroelectric generator group 4, and a thermal power generator group 5 as the power generation unit 2. These generator groups are connected to a load 8 by an electric circuit 7. The hydroelectric generator group 4 and the thermal power generator group 5 are LFC target power supplies, and their outputs are controlled according to fluctuations in power demand. The LFC is an output control for responding to a demand fluctuation having a fluctuation period of several minutes to 20 minutes. The nuclear power generator group 3 is always generating a certain amount of electric power, and is a generator not subject to LFC.

The output command control unit 20 provided at the central power supply command center has a frequency detector 21 connected to an input terminal of an LFC device (load frequency control device) 22. The frequency is measured and the reference frequency (50
Hz or 60 Hz), and applies the difference Δf to the LFC device 22. The output terminal 21A of the LFC device 22 is connected to the control input terminals of the hydraulic power generator group 4 and the thermal power generator group 5 to be controlled by the LFC. An output terminal 21 </ b> B that outputs a system demand signal from the LFC device 22 is connected to a negative input terminal of the adder 23. The output terminal of the adder 23 is connected to the input terminal 25A of the EDC device 25. Output end 25 of EDC device 25
B is connected to the control input terminal of the power source to be controlled by LFC. Another output terminal 25C of the EDC device 25 is an adder 24.
Is connected to the negative input terminal of The actual output value of each generator is input to the positive input terminal of the adder 24.

The deviation “Δf” between the frequency measured at a predetermined measurement point of the power system and the reference frequency of the system or the local demand (the amount of unbalance due to fluctuations in supply and demand in the control area) “ΔPt− K △ f ”(where △ f
Is the deviation from the reference frequency, ΔPt is the deviation from the reference power value of the interconnection line flow, and K is a system constant that is a positive value. ) Is detected (step 31 in the flowchart of FIG. 2). When a frequency fluctuation or an unbalance between supply and demand occurs beyond a predetermined reference value (step 32), an LFC signal is supplied from the central power supply command center to each generator to control the output. At this time, the required control amount, which is the power required to return to the reference frequency, is calculated (step 33). The necessary control amount is allocated in order from a generator having a predetermined priority (step 34 in the same manner) (a generator having a high LFC adjustment capability) (step 35), and the LFC instructing the assigned generator in the required control amount. Send a signal (Step 3
6).

The LFC signal used for controlling the generator output includes a current pulse signal and a command value signal.
Any device that can transmit a command value signal corresponding to the required control amount allocated to each generator may be used, and is effective for both the pulse method and the command value method. The method of determining the priority order performed in step 34 of the flowchart of FIG. 2 will be described below using a specific example.

As an example of how to determine the priority, a method of giving priority to a generator having a fast output change speed, that is, a short time from when the LFC signal is received until the output changes, will be described with reference to the flowchart of FIG. I do. For example,
When the absolute value of the deviation between the system frequency and the reference frequency is equal to or greater than a predetermined value (Δf <0) in a state where the four generators 1, 2, 3, and 4 are connected to the power system, the reference frequency 50MW required control of generator to return to
Assume that The output change speed of the generator 1 to the generator 4 is 8 MW / min, 6 MW / min, 20 MW / min, 2
It is 5 MW / min, and the margin for increasing the output (hereinafter referred to as a reserve margin) is 15 MW, 20 MW, and 2 MW, respectively.
It is assumed that they are 0 MW and 25 MW (step 41 in the flowchart of FIG. 3). In the above-mentioned state, the priorities are in the descending order of the output change speed, and the generator 4 is ranked first,
The generator 3 ranks second, the generator 1 ranks third, and the generator 2 ranks fourth (step 42).

Next, at step 43, the required control amount of 50 MW is allocated in order from the generator with the highest priority to the surplus power. That is, 25 MW of the required control amount 50 MW is allocated to the generator 4 having the first priority, and 20 MW of the remaining 25 MW is allocated to the generator 3 having the second priority. Then, the remaining 5 MW is allocated to the generator 1 having the third priority. Here, since the allocation of the required control amount of 50 MW has been completed, the required control amount is not allocated to the generator 2 having the fourth priority.
An LFC signal is transmitted to the generators 1 to 3 to which the required control amount has been allocated (step 44). The output change rate used to determine the priority is a “control characteristic” unique to each generator, and the remaining power increase is a “control state” of each generator. As described above, the generator having a fast output change rate (the generators 3 and 4 in the above example) is assigned a larger control required amount than the generator 1 having a slow output change rate, and the generator 2 having a particularly slow output change rate is completely assigned. By not assigning, it becomes possible to perform control that quickly follows demand fluctuations. LFC for generator 2 with slow output change rate
In addition to preventing over-control by suppressing signal transmission and not changing the output, it also makes it possible to operate a slow generator with a constant output and high efficiency, making economical power system frequency control possible. It becomes possible.

FIG. 4 is a graph showing the result of a simulation for comparing the conventional load frequency control method with the load frequency control method of the present invention. As the evaluation index of the simulation, the number of times of transmission of the LFC signal for 24 hours and the frequency standard deviation are used. The fact that the number of transmissions of the LFC signal is large means that despite the fact that the LFC is performed, the effect does not readily appear and the deviation Δf does not decrease.
Indicates that the signal is being output continuously. A large frequency standard deviation indicates that the LFC is not operating effectively. The vertical axes of FIGS. 4A and 4B show the number of times of transmission of the LFC signal and the frequency standard deviation, respectively, and the horizontal axes show Cases 1 to 8 described in detail below. In this simulation, three generators A and B
And C are used. Generators A and B are thermal power generators,
Generator C is a hydroelectric generator. The output change speed and the response delay time in the LFC are the largest for the generator C, the smallest for the generator A, and the generator B is between the generators C and A.
In FIG. 4A, a vertical bar hatched bar graph indicates a generator A, and a hatched hatched bar graph indicates a generator B. The bar graph without hatching indicates the generator C.

In FIGS. 4A and 4B, case 1 is a simulation result of a conventional LFC. Cases 2 to 8 are simulation results of the present invention when the conditions for determining the priority are variously changed. Case 2 is a case where a generator with a higher output change speed is given a higher priority. Case 3 is a case where a generator with a shorter response delay time is given a higher priority. Case 4
The case where the change direction of the output by the LFC and the EDC gives the same priority to the generator with the same priority. Case 5 is a case where a generator having a larger difference between the command value and the actual output is given a higher priority. Case 6 is a case where a high priority is given to a generator whose actual output has not reached the EDC command value. Case 7 is a case in which a high priority is given to a generator in which the direction approaching the optimum λ value and the direction in which the output of the LFC changes are the same.
The λ value is a value indicating the incremental fuel cost, and the λ value at which the largest increase in actual output is realized with the smallest increase in fuel is referred to as “optimum λ value”. Case 8 is a case where priority is determined by combining case 2 and case 5.

As a result of the above simulation, the number of transmissions of the LFC signal shown in FIG.
Is about 2300 times, whereas in cases 2 to 8, the number is about 400 times at the maximum, and it can be seen that the number is greatly reduced. In cases 2 to 8, the number of transmissions of the LFC signal is the largest for generator C, and
Is smaller than the generator C, and the generator A is the least. This indicates that the generator C is involved in LFC more than the generators A and B. Regarding the frequency standard deviation of FIG.
In contrast to the case where the frequency was 04 Hz, in each of Cases 2 to 8, the frequency was 0.034 Hz or less, and a considerable improvement effect was obtained. The priority may be determined by the method described below.
That is, the first priority based on the response delay time of the LFC of each generator and the second priority based on the output change speed are obtained, and based on the sum of the numerical values indicating the first and second priorities. Determine overall priority.

[0026]

As described above, according to the present invention, in consideration of the control characteristics and control state of each generator, the generators are prioritized according to the purpose at that time, and the generators having higher priorities are assigned. By allocating control requirements and maximizing the use of generators with high LFC regulation or economically advantageous generators, reasonable and efficient operation of the generators is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power system to which a load frequency control method according to the present invention is applied;

FIG. 2 is a flowchart showing the operation of the embodiment of the load frequency control method of the present invention.

FIG. 3 is a flowchart showing a specific example of an embodiment of the present invention.

FIG. 4 is a graph showing a result of simulating a situation in which the load frequency control method of the present invention is applied to a certain power system;

FIG. 5 is a graph showing a relationship between a frequency deviation and an actual output of a generator in a conventional power system.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tetsuo Sasaki 3-3-22 Nakanoshima, Kita-ku, Osaka F Kansai Electric Power Co., Inc. F-term (reference) 5G066 AA05 AE09 5H590 AA02 AA21 BB09 CA01 CA05 CA11 CA29 CC01 CE01 EA07 EA14 EB07 EB14 EB21 EB28 FA05 GA06 GA09 GB05 HA01 HA06 HA09 JA02

Claims (16)

[Claims] In a power system to which a number of generators are connected, a change in a system frequency and a power flow of an interconnection line caused by a change in power consumption is detected, and a reference frequency (50 Hz or 6 Hz) is detected.
0 Hz), or a step of obtaining the amount of supply and demand imbalance;
Calculating the control amount of power required to compensate for the fluctuation of the power consumption, according to the control characteristics of the generated power unique to each generator and the control state of the generated power of each generator, A load frequency control method in a power system, comprising: setting a priority order for a generator; and allocating the control required amount to a predetermined power value determined for each generator in order from the generator having the highest priority. 2. The control characteristic includes a response delay time until an output starts to change in response to a control signal, and a change speed which is a change amount per unit time of generated power when the control signal is received. 2. The load frequency control method in a power system according to claim 1, wherein the control state is an increase or decrease of the generated power of each generator. 3. The load frequency control method in a power system according to claim 1, wherein the predetermined power value determined for each generator is a generated power value that can be increased or decreased in each generator. 4. A control characteristic, an output change speed, and a control state, a state in which an output change direction by LFC and EDC is the same, a state in which there is a difference between a command value and an actual output, and an actual output is a command. Value has not reached, the direction to approach the optimal λ value and
2. The load frequency control method for a power system according to claim 1, wherein the priority of the generator is determined based on a combination of two or more selected from a state in which an output change direction of the LFC is the same. 5. In a power system to which a number of generators are connected, a change in a system frequency and a power flow of an interconnecting line caused by a change in power consumption is detected, and a reference frequency (50 Hz or 6 Hz) is detected.
0 Hz), or a step of obtaining an amount of supply and demand imbalance, and when the deviation or the amount of supply and demand imbalance is equal to or more than a predetermined value,
Calculating a control amount of power required to compensate for the fluctuation of the power consumption; a load frequency control signal (hereinafter, LFC signal) for instructing an increase or decrease of the power generated by the generator according to the control amount. ), And based on the response delay time to the LFC signal or the rate of change of the generated power, which is measured in advance for each generator receiving the LFC signal, the output of each generator changes. A first priority order is set in which the response delay time until the start is long, from the longest one to the shortest one, and the order of the change in the generated power per unit time from the slowest one to the fastest one is sequentially changed. Setting an ascending second priority, wherein the higher the total priority of the generator determined by a predetermined method by integrating the first and second priorities, the more the LFC signal The amount of control required to compensate for the fluctuation of the power consumption, which is instructed by the application, is increased, and the lower the total priority of the generator is, the smaller the amount of control required is allocated or not allocated. A load frequency control method in a power system. 6. The first and second comprehensive priorities are the first and second priorities.
6. The load frequency control method for a power system according to claim 5, wherein the load frequency is determined based on a sum of respective numerical values indicating the priority order. 7. The power system according to claim 5, wherein the total priority is determined based on the first priority with respect to the same priority in the second priority. Load frequency control method. 8. The power system according to claim 5, wherein the overall priority is based on a second priority with respect to a same priority in the first priority. Load frequency control method. 9. The load frequency control method in an electric power system according to claim 5, wherein the required control amount is assigned only to some of the generators having a high overall priority. 10. The control necessary so that only a part of the generators having the first priority order has a higher allocation amount as the generators having the first priority order among the part generators have a higher priority. 6. The method according to claim 5, wherein the amount is assigned. 11. The control necessary for only a part of the generators having the second priority and a control amount such that the higher the second priority of the part generators, the larger the allocated amount. 6. The method according to claim 5, wherein the amount is assigned. 12. In order to perform economical power generation, the generated power of a generator with a low power generation cost among a large number of generators is increased, and the generated power of a generator with a high power generation cost is reduced. , Economic load distribution control (hereinafter,
A generator in which the change direction indicating increase / decrease of the generated power in the command value of EDC) is the same as the change direction indicating increase / decrease of the generated power of the LFC signal, wherein the first and second priorities are different. In at least one of the high-priority generators, the higher the priority of the generator, the larger the allocated amount of the control required amount, and the lower the priority of the generator, the higher the allocated amount of the control required amount. 6. The method according to claim 5, wherein the load frequency is reduced. 13. The method according to claim 13, further comprising: detecting an output deviation between the EDC command value and an actual output value for each generator, and comparing the detected output deviations with each other. Only for some of the large generators, the generator with the larger output deviation increases the allocated amount of the required control amount, and the generator with a smaller output deviation decreases the allocated amount of the required control amount. The load frequency control method in a power system according to claim 12. 14. A part having a higher priority in at least one of the first and second priorities in which generated power has not reached the EDC command value and a priority determined by the magnitude of an output deviation. 13. The generator according to claim 12, wherein the higher the priority, the larger the allocated amount of the required control amount, and the lower the priority, the smaller the allocated amount of the required control amount. A load frequency control method in a power system. 15. The direction in which the actual generated power of the generator approaches the optimal incremental fuel cost is the same as the direction in which the generated power of the LFC signal indicates an increase or decrease in the generated power, and the first and second directions are the same.
In some of the generators having a higher priority in at least one of the priorities determined by the magnitude of the output deviation, the higher the priority, the larger the allocated amount of the control required amount. 13. The method according to claim 12, wherein the load frequency is controlled in a power system. 16. The first priority order and the second priority order for a generator in which the change direction of increase or decrease of the power generation output based on the command value of EDC and the change direction of increase or decrease of the power generation output based on the command value of LFC are the same.
13. The power system according to claim 12, wherein the control necessary amount is allocated in order from a generator having a higher priority according to any one of the priorities determined by the priority of the power and the magnitude of the output deviation. Load frequency control method.