JP5802469B2 - Power system load frequency control system and program - Google Patents

Description

  Embodiments described herein relate generally to a power system load frequency control system and a program.

  The demand (load) of the power system is constantly changing seasonally, temporally, and momentarily. It is considered that the load fluctuation of the power system is a superposition of pulsating components having various vibrations and periods with a small variation width and irregular fluctuation components. The components of the load fluctuation include a cyclic part for a minute fluctuation up to a period of several minutes, a fringe part for a short period fluctuation from a few minutes to about 10 minutes, and a sustain part for a long period fluctuation of 10 minutes or more. It is mainly divided into three components.

  If the characteristics of the governor of the power plant that operates governor-free is appropriate for the component of extremely short cycle such as cyclic component than the load characteristic of the system, and the component of periodic fluctuation of about several minutes beyond that, Adjusted automatically. For longer periodic components, control sharing for each periodic component is performed at the central power supply command center of the electric power company.

  Load fluctuations with a fluctuation period of up to 10 minutes, such as the fringe, have a larger fluctuation amount than the cyclic part, and therefore cannot be adjusted only by the governor-free operation. For this reason, the output of the generator is adjusted by detecting the frequency deviation and the amount of power fluctuation by load frequency control (LFC).

  Sustained load fluctuations with a longer fluctuation period can be considered as part of the changes that are dominated by the daily load curve, where the load fluctuations are quite large. When adjusting the sustain amount having such a large load fluctuation, the load changing control alone is insufficient for the output changing capability of the power plant, and the economical load distribution between the power plants becomes a problem. For this reason, for long-period load fluctuations such as sustain, the power plant is mainly responsible for economic operation, and power supply is adjusted by economic load distribution control (ELD).

  These load frequency control systems and economic load distribution control systems are the most important functions of the central power supply command center in electric power companies. The main purpose of each system is to maintain a constant power flow and system frequency in the load frequency control (LFC), and to create an operation plan that is the most economical in the economic load distribution control (ELD). Is to do.

  Load frequency control (LFC) commands the output adjustment of each generator (power generation unit) at a central power supply command station according to changes in the system frequency and the interconnection current flow with other systems. This output adjustment command is issued to an oil-fired thermal power generation unit or a hydraulic power unit that does not cause a problem even if quick output fluctuation is performed among all the power generation units. Also, output adjustment commands are generally not issued to nuclear power units, coal-fired thermal power units, and power generation units that want to avoid output fluctuations for operational reasons.

  In load frequency control (LFC), since a command is issued from the central power supply command station in this way, there is usually a delay of about several tens of seconds before the output actually changes.

  Load frequency control (LFC) mainly includes constant frequency control (FFC), constant power control (FTC), and frequency bias connection power control (TBC). ).

  The constant frequency control (FFC) is a method of detecting the frequency change amount (ΔF), adjusting the output of the generator so as to reduce this, and keeping only the system frequency at a specified value.

  Fixed grid power control (FTC) detects the grid line power flow variation (ΔPT), adjusts the output of the generator so as to reduce this, and tries to keep only the grid cable power flow at the specified value. It is a method.

  Frequency bias interconnection power control (TBC) detects frequency change (ΔF) and interconnection power flow change (ΔPT), calculates regional demand power (AR) from these, and according to the amount This is a method to adjust the output of the generator.

  Hereinafter, an example of frequency bias interconnection power control (TBC) performed in most Japanese electric power companies will be described.

  The frequency bias interconnection power control (TBC) is a method in which a generator command is issued to adjust the output to each generator from the central power supply command center of each power company. The following procedures [1] to [[ 6].

  [1] Based on the frequency change amount (ΔF) and the interconnection power flow change amount (ΔPT), the regional required power (AR) is calculated as shown in equation (1).

AR = −K · ΔF + ΔPT (1)
Here, K: system constant, ΔPT: tidal current flowing into own system is positive.

  Note that when the regional demand power (AR) is a positive value, it is necessary to increase the output of the generator as a whole system. Further, when the regional demand power (AR) is a negative value, it is necessary to reduce the output of the generator as a whole system.

  [2] When filtering the regional required power (AR), filtering is performed by exponential smoothing using the past regional required power (AR), and the regional required power (AR) is converted to a low speed machine (eg, output change rate). ) And a high-speed machine (eg, a hydropower machine with a fast output change speed). Instead of the filtering method, a method may be used in which the regional required power (AR) is frequency-resolved, a short periodic component is assigned to a low speed machine, and a long periodic component is assigned to a high speed machine.

  [3] When allocating filtered or frequency-resolved regional demand power (AR) to each generator, the power generation is performed for all generators for which load frequency control is performed for each low-speed machine and high-speed machine. Distribute based on the output change speed ratio or output margin ratio of the machine.

  [4] The target command value of each generator is calculated by an operation such as adding the allocated regional required power (AR) and the ELD value calculated for each hour in the economic load distribution control (ELD). The The target command value may be provided with upper and lower limit values so as not to deviate from a certain reference value or more.

  [5] Each generator adjusts the output according to the target command value received from the central power supply command station. As a result, the system frequency and the interconnecting line power flow change, and a frequency change amount (ΔF) and an interconnecting line power flow change amount (ΔPT) are generated.

  [6] Return to procedure [1].

Japanese Patent No. 3930218 JP 2007-306770 A

"Power System Engineering" Maruzen ISBN4-621-04636-5 (P104) "Electrical Engineering Handbook" The Institute of Electrical Engineers of Japan ISBN4-88686-012-5 (P970 to P975) Technical Report No. 869 of the Institute of Electrical Engineers of Japan “Normal and Emergency Load Frequency Control in the Power System” The Institute of Electrical Engineers of Japan, Power and Energy Division, Power System Technical Committee (P133 to P141)

  However, the load frequency control (LFC) as described above usually has no problem. However, according to the study of the present inventor, there is a possibility that a residual distribution of the regional required power (AR) may occur in some cases. For this reason, there is room for improvement so that the occurrence of this residual distribution can be suppressed.

  For example, in the above-mentioned procedure [3], the regional required power (AR) subjected to filtering or frequency decomposition is distributed to each generator. However, when the number of generators subject to LFC is small or the remaining capacity of those generators ( If the difference between the current output and the maximum output, or the difference between the current output and the minimum output) is small, there is a possibility that the regional demand power (AR) cannot be allocated and a remaining distribution occurs. In addition, when distribution remainder arises, control performance will be reduced according to the amount of distribution remainder.

  Also, the regional power requirement (AR) frequency-decomposed according to the characteristics of the generator is biased like an operating system in which the generator targeted for LFC consists of a large number of high-speed machines and a small number of low-speed machines. In the case of an operating system, the low-speed machine side has a small number of adjustments and a reserve capacity, so the regional power demand (AR) cannot be allocated and there may be a remaining distribution. Similarly, in the case of an operating system consisting of a small number of high-speed machines and a large number of low-speed machines, the high-speed machine side has a small number of adjustments and adjustment capacity, so there may be a residual distribution of regional required power (AR). There is sex. As described above, these remaining distributions deteriorate the control performance according to the amount of remaining distributions.

  In summary, in load frequency control (LFC), if there is little adjustment capacity of the generator, or if the operation system is biased, there is a possibility of causing a residual distribution of regional required power (AR). There is room for improvement so that the remaining generation can be suppressed.

  The problem to be solved by the present invention is to provide a load frequency control system and program capable of suppressing the occurrence of residual distribution of regional required power when there is little adjustment capacity of the generator or when the operation system is biased. is there.

  The load frequency control system according to the embodiment includes a frequency change amount detection means, an interconnected power flow change amount detection means, an area request power calculation means, a frequency resolution means, an area request power distribution means, a target command value calculation means, and a command value transmission means. It has.

  The frequency change amount detecting means detects a frequency change amount of the power system.

  The interconnecting line power flow variation detecting means detects the interconnected power flow variation of the power system.

  The regional required power calculation means calculates the regional required power based on the frequency change amount and the interconnection power flow change amount.

  The frequency resolving means frequency-resolves the calculated regional power requirement.

  The regional required power distribution means distributes the frequency-resolved regional required power for each generator.

  The target command value calculation means calculates a target command value from the allocated regional demand power and the economic load distribution schedule value calculated by the economic load distribution control.

  The command value transmission means transmits the calculated target command value to the generator.

Here, the area required power allocation means comprises adjustment means.

Before Sulfur butterfly integer unit calculates an adjustment margin of the low-speed machine of the high-speed machine adjustment margin between the generator of the generator.

Before Sulfur butterfly integer unit, when adjusted reserve capacity of the high-speed machine is greater than a threshold value than adjustment reserve capacity of the low-speed machines, while increasing the frequency band range in which the high-speed machine is shared, the low-speed machine share to reduce the frequency band range.

Before Sulfur butterfly integer unit, when adjusted reserve capacity of the low-speed machine is greater than a threshold value than adjustment reserve capacity of the high-speed machines, while increasing the frequency band range in which the low-speed machine is shared, the high-speed machine is shared to reduce the frequency band range.

It is a schematic diagram which shows the structure of the load frequency control system common to each embodiment. It is a flowchart for demonstrating the processing content of load frequency control common to each embodiment. It is a flowchart for demonstrating the processing content of the AR distribution part common to each embodiment. It is a flowchart for demonstrating the outline | summary of each embodiment. It is a flowchart for demonstrating the AR allocation process which concerns on 1st Embodiment. It is a flowchart for demonstrating AR distribution processing in the embodiment. It is a flowchart for demonstrating AR distribution processing in the embodiment. It is a schematic diagram which shows the AR allocation process in the embodiment. It is a flowchart which shows the modification of AR allocation processing in the embodiment. It is a mimetic diagram showing the modification of AR distribution processing in the embodiment. It is a flowchart for demonstrating AR allocation processing which concerns on 2nd Embodiment. It is a mimetic diagram showing the modification of AR distribution processing in the embodiment. It is a flowchart for demonstrating AR allocation processing which concerns on 2nd Embodiment. It is a flowchart for demonstrating AR allocation processing which concerns on 2nd Embodiment.

  Each embodiment will be described below with reference to the drawings. The apparatus described below using a computer as an example can be implemented with either a hardware configuration or a combined configuration of hardware resources and software. As the software of the combination configuration, a program that is installed in advance from a network or a computer-readable storage medium into the computer of the device and realizes the function of the device is used.

  FIG. 1 is a schematic diagram showing a configuration of a load frequency control system common to each embodiment, FIG. 2 is a flowchart for explaining processing contents of load frequency control common to each embodiment, and FIG. It is a flowchart for demonstrating the processing content of the AR distribution part common to embodiment. As shown in FIG. 1, the power system 1 includes a data detection unit 10 and n generators G1, G2,..., Gn, and is connected to another system 3 via a connection line 4. Each of the generators G1, G2,..., Gn is connected to n generator output signal input parts 201, 202,..., 20n in the computer 2 via a detection signal line 11 and a control signal line 12. The n command value transmission units 231, 232,..., 23 n are individually connected. The computer (computer) 2 includes a man-machine interface MMI5, n generator output signal input units 201, 202,..., 20n, n command value transmission means 231, 232,. .., 22n, AR calculation unit 24, AR decomposition unit 25, AR distribution unit 26, power generation end total demand calculation unit 27, online forecast demand unit 28, previous day operation plan unit 29, and ELD schedule calculation The unit 30 is provided.

  The generator output signal input units 201, 202,..., 20n individually generate generator output signals indicating output values of the generators G1, G2,. Transmit to. These generator output signals are also transmitted to the power generation end total demand calculation unit 27.

  The power generation end total demand calculation unit 27 takes in the generator output signals from the generator output signal input units 201, 202,..., 20n and calculates the power generation end total demand. The calculated power generation end total demand is input to the online forecast demand unit 28.

  The online forecast demand unit 28 inputs the online forecast demand to the ELD schedule calculation unit 30 based on the input power generation end total demand. Also, the previous day operation plan unit 29 inputs a preset previous day operation plan to the ELD schedule calculation unit 30.

  That is, as shown in FIG. 2, the operation data including the online predicted demand and the previous day operation plan is input to the ELD schedule calculation unit 30 (step S100).

  On the other hand, the data detection unit 10 detects the frequency change amount (ΔF) and the interconnection power flow change amount (ΔPT) of the power system 1. The detected frequency change amount (ΔF) and interconnection line power flow change amount (ΔPT) are input to the AR calculator 24 via the signal line 13.

  The AR calculation unit 24 calculates the regional required power (AR) as shown in the equation (1) based on the input frequency change amount (ΔF) and interconnection power flow change amount (ΔPT) (step S200). . The calculated AR is input to the AR decomposition unit 25.

  The AR decomposition unit 25 performs frequency decomposition on the calculated AR, and inputs the frequency decomposition result of the AR to the AR distribution unit 26 and the ELD schedule calculation unit 30 (step S300).

  The ELD schedule calculation unit 30 calculates an ELD schedule value (hereinafter referred to as an ELD value) by economic load distribution control based on the frequency decomposition result of the input AR and the online predicted demand and the previous day operation plan input in step S100. The ELD value is calculated and input to the target command value calculation units 221, 222,..., 22n (step S400).

  On the other hand, the AR distribution unit 26, based on the frequency decomposition result input in step 300, changes the frequency-resolved regional required power (AR) for each generator so that the fluctuation period component of the regional required power (AR) is distributed. , The distribution amount of the regional required power (AR) for each generator G1, G2,..., Gn is calculated (step S500).

  In this step S500, as shown in detail in FIG. 3, the AR distribution unit 26 extracts a short cycle component (eg, a period of several tens of seconds to 1 or 2 minutes) from the input frequency decomposition result (step E1: Yes), the distribution amount of the high speed machines is calculated so that the extracted short cycle components are shared by the high speed machines (eg, hydraulic machines) among the generators G1, G2,..., Gn (step E2). ).

  In step S500, the AR distribution unit 26 extracts a medium cycle component (eg, 1 or more than 2 minutes to several minutes) from the input frequency decomposition result (step E3: Yes), and the extracted medium cycle The distribution amount of the low speed machines is calculated so that the components are shared by the low speed machines (eg, thermal power machines) among the generators G1, G2,..., Gn (step E4).

  Further, in step S500, the AR distribution unit 26 extracts a long-period component (eg, a period exceeding several minutes) from the input frequency decomposition result (step E3: No), and converts the extracted long-period component into an ELD value. The ELD value correction amount is calculated so as to be added (step E5). The calculated distribution amount and ELD correction amount are input to the target command value calculation units 221, 222,.

  The target command value calculation units 221, 222,..., 22n are input from the generator output signals of the generators G1, G2,..., Gn, the AR value input from the AR distribution unit 26, and the ELD schedule calculation unit 30. The target command values are individually calculated based on the ELD values thus obtained (step S600), and these target command values are individually transmitted via the command value transmission means 231, 232,..., 23n (step S700). Transmit to G1, G2,..., Gn (step S800).

  The above is the outline of the load frequency control common to the embodiments. Hereinafter, an outline of each embodiment will be sequentially described. In each of the embodiments, as shown in FIG. 4, in the AR distribution process of step S500 by the AR distribution unit 26, the generator priority mode selection step A, the frequency band adjustment mode selection step B, and the frequency band automatic adjustment mode Two of the steps consisting of execution step C, frequency band manual adjustment mode execution step D, distribution amount / correction amount calculation step E, high speed machine priority mode execution step H, and low speed machine priority mode execution step L This is an embodiment for carrying out the above steps. Step E is performed in all the embodiments.

  The first embodiment is a mode in which a distribution amount / correction amount calculation step E and a high-speed machine priority mode execution step H are performed. However, as a modified example, the calculation step E of the distribution amount / correction amount and the execution step L of the low speed machine priority mode may be performed.

  In the second embodiment, the execution step C of the automatic frequency band adjustment mode and the distribution amount / correction amount calculation step E are performed. However, as a modification, the execution step H or L described in the first embodiment may be further performed.

  In the third embodiment, the priority mode selection step A of the generator, the distribution amount / correction amount calculation step E, and the execution step H or L selected in step A are performed. However, as a modification, the execution step C described in the second embodiment may be further performed.

  In the fourth embodiment, the selection step B of the frequency band adjustment mode, the execution step C or D selected in step B, and the distribution amount / correction amount calculation step E are performed. However, as a modification, the execution step H or L described in the first embodiment may be further performed, and in addition to this, the selection step A described in the third embodiment may be further performed.

  The above is the outline of each embodiment. Hereinafter, each embodiment will be specifically described sequentially.

<First embodiment: AR allocation method according to adjustment capacity>
5 to 7 are flowcharts for explaining the AR distribution processing by the AR distribution unit 26 according to the first embodiment.

  When performing load frequency control (LFC), the frequency-resolved regional demand power (AR) is distributed to the generators of the high speed machine and the low speed machine. However, if the adjustment capacity (difference between maximum output and current output, or difference between minimum output and current output) of LFC target generators in parallel is smaller than the required regional power (AR) to be allocated, the regional required power (AR) Cannot be allocated, and the balance remains.

  Therefore, in the present embodiment, for example, when the adjustment capacity of the high speed device is small with respect to the AR distribution amount to be shared by the high speed devices, as shown in FIG. It is the composition which adds to. Similarly, in this embodiment, when the adjustment capacity of the low speed machine is small with respect to the AR distribution amount that the low speed machine should share, the distribution amount that cannot be adjusted is converted into the ELD correction amount.

  Specifically, the AR distribution unit 26 extracts the short cycle component, the middle cycle component, and the long cycle component of the regional required power frequency-resolved by the AR decomposition unit 25, and extracts the short cycle component of the generators G1 to Gn. Allocating to the high speed machine, allocating the medium period component to the low speed machine among the generators G1 to Gn, adding the long period component to the ELD value (economic load distribution schedule value), and not allocating the short period component In this case, the short-cycle component that could not be allocated (the remaining allocation of the high-speed machine) is allocated to the low-speed machine, and if the medium-cycle component cannot be allocated, the medium-cycle component that could not be allocated (low-speed machine) Of the high-speed machine priority distribution function to further add the remaining distribution) to the ELD value.

In the AR distribution unit 26, the remaining distribution of the high speed machine and the low speed machine, and the adjustment capacity for raising and lowering can be calculated as shown in the following equations (2) to (21).

  Next, the operation of the AR distribution unit 26 configured as described above will be described with reference to FIGS.

  As illustrated in FIG. 3, the AR distribution unit 26 executes a distribution amount / correction amount calculation step E. That is, the AR distribution unit 26 extracts the short period component, the middle period component, and the long period component of the regional required power frequency-decomposed by the AR decomposition unit 25, and uses the short period component as a high speed machine among the generators G1 to Gn. Distribute, distribute the medium period component to the low speed machine among the generators G1 to Gn, and add the long period component to the ELD value.

  Subsequently, as shown in FIG. 5, the AR distribution unit 26 executes the execution step H of the high speed machine priority mode. That is, the AR distribution unit 26 calculates the high-speed device distribution remainder as shown in the equations (2) to (11) and FIG. 6 (steps H1, H1-1 to H1-11).

  After step H1, the AR distribution unit 26 determines whether or not there is a remaining high-speed machine (step H2). If there is no remaining high-speed machine (when the remaining high-speed machine = 0), the process ends.

  If there is a remaining high-speed device as a result of the determination in step H2, the AR distribution unit 26 adds the remaining high-speed device to the low-speed device distribution amount (step H3).

  After step H3, the AR distribution unit 26 calculates the remaining low-speed aircraft distribution as shown in equations (12) to (21) and FIG. 7 (steps H4, H4-1 to H4-11).

  After step H4, the AR distribution unit 26 determines whether or not there is a low-speed machine remaining (step H5). If there is no low-speed machine remaining (when the low-speed machine remaining is 0), the process ends.

  If there is a low-speed machine remaining as a result of the determination in step H5, the AR distribution unit 26 further adds the low-speed machine remaining to the ELD correction amount (step H6).

  As described above, according to the present embodiment, the short period component, the medium period component, and the long period component of the frequency-resolved regional required power are extracted, the short period component is distributed to the high speed machine, and the medium period component is set to the low speed machine. When the short period component could not be allocated, the short period component that could not be allocated was allocated to the low speed machine, and the medium period component could not be allocated. In some cases, the regional required power (AR) can be distributed according to the adjustment capacity of the high-speed machine and the low-speed machine, by further adding the medium cycle component that could not be distributed to the ELD value. Therefore, when there is little adjustment capacity of a generator, generation | occurrence | production of the remaining distribution of local request | requirement electric power can be suppressed, and it becomes possible to reduce remaining distribution and to improve control performance.

  In the present embodiment, the method of adding the allocation amount that cannot be adjusted to the AR allocation amount of the low speed device when the adjustment capacity of the high speed device is small with respect to the AR allocation amount that the high speed device should share is shown. However, the order of adding the distribution amounts is not limited to this method. For example, as shown in FIGS. 9 and 10, the distribution amount addition order may be a method of adding a distribution amount that cannot be adjusted by the low speed device to the AR distribution amount of the high speed device. In this case, the AR distribution unit 26 extracts the short-cycle component, the middle-cycle component, and the long-cycle component of the regional required power frequency-resolved by the AR decomposition unit 25, and uses the short-cycle component as a high-speed machine among the generators G1 to Gn. When the medium period component cannot be allocated, the medium period component is allocated to the low speed machine among the generators G1 to Gn, the long period component is added to the ELD value (economic load distribution schedule value). Distributes the medium-cycle components that could not be allocated (remaining allocation of low-speed aircraft) to high-speed devices, and if short-cycle components could not be allocated, the short-cycle components that could not be allocated (distribution of high-speed devices) What is necessary is just to have a low-speed machine priority distribution function which adds the remaining) to the ELD value. In FIG. 9, the low-speed aircraft distribution remaining calculation step L1 may be executed in the same manner as the calculation step H4 described above. Further, the calculation step L4 for the distribution of the high speed machine may be executed in the same manner as the calculation step H1 described above.

  In addition, the high-speed machine and the low-speed machine are not limited to generators such as thermal power generators and hydroelectric power generators, and power storage devices for secondary batteries (storage batteries, rechargeable batteries, etc.) that can charge and discharge power. It is also applicable to.

<Second embodiment: AR allocation method according to operation system>
FIG. 11 is a flowchart for explaining the AR distribution processing of the AR distribution unit 26 according to the second embodiment.

  When performing load frequency control (LFC), the frequency-resolved AR is allocated to the generators of the high speed machine and the low speed machine as in the first embodiment, but the number of parallel LFC target generators is always fixed ( The specified generators are not the target), and the operator of the central power supply command center selects the generators and adjusts the number according to the season, time of day, or fluctuations in demand. Therefore, when the number of generators of the low-speed machine and the high-speed machine is biased to either direction, there is a possibility that a difference occurs in the adjustment margin. For example, if the operating system is biased so that the number of LFC target generators in parallel is large, with a large number of high-speed machines + a small number of low-speed machines, the number of adjustments and the adjustment capacity on the low-speed machine side will be small. Therefore, there is a possibility that the regional power demand (AR) cannot be sufficiently distributed and a residual distribution is generated. On the contrary, the same applies to the case where there are a small number of high-speed machines and a large number of low-speed machines, and there is a possibility that an unbalanced distribution may occur on the high-speed machine side. Therefore, in this embodiment, the frequency band of the regional required power (AR) to be shared is changed according to the operating system of the high speed machine and the low speed machine.

Basically, if the adjustment capacity of the high-speed machine becomes larger than the adjustment capacity of the low-speed machine, the frequency band that the high-speed machine should share ( the time width of the periodic component according to the frequency band ) should be expanded (the frequency that the low-speed machine should share ) band narrowing (time width of the periodic component corresponding to)) yo Unisuru. That is, a small low-speed machine with adjustment reserve capacity is smaller frequency bands (time width of the periodic component corresponding to), (corresponding to the periodic component) relatively long By giving a frequency band, the fluctuation period of a slow I will share it. This makes it difficult for residual distribution to occur even when the adjustment margin is small. The reverse is also true, and if the adjustment capacity of the low speed machine becomes larger than that of the high speed machine, the high speed machine having a small adjustment capacity reduces the frequency band ( the time width of the corresponding periodic component ) .

Specifically, the AR distribution unit 26 has the following functions (f2-1) to (f2-4). Incidentally, these three functions (f2-1) ~ (f2-3) constitutes the adjustment function.

  (f2-1) Adjustable power of the high-speed machine among the generators G1 to Gn (sum of all the high-speed machine surplus power) and adjustment surplus of the low-speed machine of the generators G1 to Gn (sum of all the low-speed machine surplus power) The function to calculate and.

(f2-2) if adjustment reserve capacity of the high-speed machine is greater than a threshold value than adjustment margin of the low-speed machines, while increasing the frequency band range in which the high-speed machine share the frequency band range in which the low-speed machine share The function to make it smaller.

(f2-3) if adjustment reserve capacity of the low-speed machine is greater than a threshold value than adjustment reserve capacity of high-speed machines, while increasing the frequency band range in which the low-speed machine to share the frequency band range in which the high-speed machine is shared The function to make it smaller.

(f2-4) The short period component, medium period component, and long period component of the regional required power frequency-decomposed by the AR decomposition unit 25 are extracted according to the time width of the period component corresponding to the frequency band, and the short period component is extracted. A function that distributes to high speed machines, distributes medium-cycle components to low-speed machines, and adds long-cycle components to the economic load distribution schedule value.

The adjustment conditions of the frequency band (according to the period component time width ) are as shown in equations (22) to (33).

  Next, the operation of the AR distribution unit 26 configured as described above will be described with reference to FIG.

  First, the AR distribution unit 26 executes the execution step C of the frequency band automatic adjustment mode. That is, the AR distribution unit 26 determines whether or not the regional required power (AR) frequency-resolved by the AR decomposition unit 25 is 0 or more (step C1). If not, the process proceeds to step C7.

  As a result of the determination in step C1, when the regional required power (AR) is 0 or more, the AR distribution unit 26 increases all the high-speed aircraft based on the above-described equations (10), (20), and (22). The sum of the remaining power and the sum of all the low-speed machine lifting surpluses are calculated (step C2).

  Thereafter, the AR distribution unit 26 calculates the adjustment margin of the high speed machine as shown on the left side of the equation (22) using the calculation result of step C2 and a predetermined weighting factor, and the calculation result is a predetermined value. It is determined whether or not the threshold value is exceeded (step C3).

When the adjustment margin of the high speed machine is equal to or greater than the threshold value (corresponding to the case where the adjustment capacity of the high speed machine is greater than the adjustment capacity of the low speed machine), the AR distribution unit 26 represents the equations (23) to (24). as such, with increasing the frequency band range of the short-period components a to be allocated to high-speed machine, to reduce the frequency band range of the periodic component b within which is distributed to the low speed machine (step C4).

  If the result of determination in step C3 is negative, the AR distribution unit 26 uses the calculation result in step C2 and a predetermined weighting factor to indicate the adjustment margin for the low speed machine on the left side of equation (25). It is determined whether or not the calculation result is equal to or greater than a predetermined threshold (step C5).

When the adjustment margin amount of the low speed machine is equal to or larger than the threshold (corresponding to the case where the adjustment capacity of the low speed machine is larger than the adjustment capacity of the high speed machine), the AR distribution unit 26 is expressed by equations (26) to (27). as such, while reducing the frequency band range of the short-period components a to be allocated to high-speed machine, to increase the frequency band range of the periodic component b within which is distributed to the low speed machine (step C6).

  On the other hand, as a result of the determination in step C1, when the area required power (AR) is a negative value, the AR distribution unit 26 determines that all the above-mentioned expressions (11), (21), and (28) are used. The sum of the high speed machine lowering capacity and the total of all the low speed machine lowering powers are calculated (step C7).

  Thereafter, the AR distribution unit 26 calculates the adjustment margin amount of the high speed machine as shown on the left side of the equation (28) using the calculation result of step C7 and a predetermined weighting factor, and the calculation result is a predetermined value. It is determined whether or not the threshold value is exceeded (step C8).

When the adjustment margin of the high speed machine is equal to or greater than the threshold (corresponding to the case where the adjustment capacity of the high speed machine is greater than the adjustment capacity of the low speed machine), the AR distribution unit 26 is represented by equations (29) to (30). as such, with increasing the frequency band range of the short-period components a to be allocated to high-speed machine, to reduce the frequency band range of the periodic component b within which is distributed to the low speed machine (step C9).

  If the result of determination in step C8 is negative, the AR distribution unit 26 uses the calculation result in step C7 and a predetermined weighting factor to indicate the adjustment margin for the low speed machine on the left side of equation (31). It is determined whether or not the calculation result is equal to or greater than a predetermined threshold (step C10).

When the adjustment margin amount of the low speed machine is equal to or larger than the threshold (corresponding to the case where the adjustment capacity of the low speed machine is larger than the adjustment capacity of the high speed machine), the AR distribution unit 26 represents the equations (32) to (33). as such, while reducing the frequency band range of the short-period components a to be allocated to high-speed machine, to increase the frequency band range of the periodic component b within which is distributed to the low speed machine (step C11).

  Thus, the execution step C of the frequency band automatic adjustment mode is completed.

Subsequently, the AR distribution unit 26 executes a distribution amount / correction amount calculation step E as illustrated in FIG. 3. That is, the AR distribution unit 26 corresponds to the time width of the periodic component corresponding to the frequency band obtained by adjusting the short period component, the middle period component, and the long period component of the regional required power frequency-decomposed by the AR decomposition unit 25 in step C. Extract, distribute short-period components to high-speed machines, distribute middle-cycle components to low-speed machines, and add long-period components to the economic load distribution schedule value.

As described above, according to the present embodiment, the adjustment capacity of the high speed machine and the adjustment capacity of the low speed machine are calculated, and if the adjustment capacity of the high speed machine is greater than the adjustment capacity of the low speed machine, the high speed machine while the machine is to increase the frequency band range to be shared, reducing the frequency band range in which the low-speed machine is shared, when the adjustment reserve capacity of the low-speed machine is greater than a threshold value than adjustment reserve capacity of the high-speed machine, the low speed machine while increasing the frequency band range to be shared, the periodic component of the high-speed machine to reduce the frequency band range to be shared, the frequency decomposed short period component area required power, the middle period component and the long-period components corresponding to the frequency band In accordance with the time width of the generator, the short-cycle component is distributed to the high-speed machine, the medium-cycle component is distributed to the low-speed machine, and the long-cycle component is added to the economic load distribution schedule value. Land to share according to Required power (AR) may be allocated. Therefore, in the case of a biased driving system, it is possible to suppress the occurrence of the remaining distribution of required regional power, to reduce the remaining control, and to improve the control performance.

Further, in the present embodiment, the criteria for determining the surplus / lower capacity of the high speed machine and the low speed machine is used as a criterion. However, the present invention is not limited to this. For example, as shown in FIG. May be used as a criterion. In this case, the AR distribution unit 26 calculates the adjustment margin number of high speed machines as the number of high speed machines minus the number of low speed machines (step C21), and determines whether the calculation result is equal to or greater than a predetermined threshold (step C22). When adjusting margin number of high-speed machine is not less than the threshold value, AR allocation unit 26, each component a in a manner similar to step C4, adjusting the frequency band range of b (step C23). If the result of determination in step C22 is negative, the AR distribution unit 26 calculates the number of low-speed machine adjustment margins as the number of low-speed machines-number of high-speed machines (step C24), and the calculation result is a predetermined threshold value. It is determined whether or not this is the case (step C25). When adjusting margin number of low speed machines is equal to or higher than the threshold, AR allocation unit 26, each component a in the same manner as step C6, adjusting the frequency band range of b (step C26).

  Further, this embodiment may be combined with Step H or L of the first embodiment. In this case, the AR distribution unit 26 may execute the execution step C of the automatic frequency adjustment mode prior to the calculation step E of the distribution amount / correction amount of the first embodiment.

  Further, in the present embodiment, as in the first embodiment, the high-speed machine and the low-speed machine are not limited to generators such as a thermal power generator and a hydraulic power generator, and a secondary battery capable of charging and discharging electric power. It can also be applied to a power storage device (storage battery, rechargeable battery, etc.).

<Third Embodiment: Priority Allocation Method for Remaining Distribution>
FIG. 13 is a flowchart for explaining the AR distribution processing of the AR distribution unit 26 according to the third embodiment.

  In the first embodiment, a method of adding the remaining distribution of the high speed machine to the distribution amount of the low speed machine, or conversely, adding the remaining distribution of the low speed machine to the distribution amount of the high speed machine is shown, and this addition order is also limited. I also showed that it was not. Based on these, in the present embodiment, the AR distribution unit 26 has a function capable of arbitrarily selecting which of the low speed machine and the high speed machine is to preferentially add the remaining distribution to the distribution amount. In actual operation, a switching mode may be provided so that an operator at the central power supply command station can arbitrarily select.

  Specifically, the AR distribution unit 26 includes the following functions (f3-1) to (f3-4) in addition to the functions of the first embodiment.

  (f3-1) Mode selection function that selects either high-speed machine priority mode or low-speed machine priority mode in advance.

  (f3-2) Function to activate the high speed machine priority distribution function (Step H) by selecting the high speed machine priority mode.

  (f3-3) Function to operate the low speed machine priority distribution function (Step L) by selecting the low speed machine priority mode.

  Next, the operation of the AR distribution unit 26 configured as described above will be described with reference to FIG.

  First, the AR distribution unit 26 executes the execution step A of the generator priority mode. That is, for example, the AR distribution unit 26 displays an inquiry as to whether or not the remaining distribution is preferentially allocated to a high-speed machine on a display unit (not shown) (step A1), and the high-speed machine responds according to the operation of the operator. When the remaining distribution is preferentially assigned to the machine, the high speed machine priority mode is selected (step A2), and when the result is negative, the low speed machine priority mode is selected (step A3).

  Subsequently, when the high-speed device priority mode is selected in step A2, the AR distribution unit 26 executes the process of step H shown in FIGS. 5 to 8 after the common step E.

  Further, when the low-speed machine priority mode is selected in step A3, the AR distribution unit 26 executes the process of step L shown in FIGS. 9 and 10 after the common step E.

  As described above, according to the present embodiment, either the high-speed machine priority mode or the low-speed machine priority mode is selected in advance, the short-period component of the frequency-resolved regional required power is allocated to the high-speed machine, and the medium-cycle component is set to the low-speed machine. After the long-period component is added to the economic load distribution schedule value, the periodic component that could not be allocated according to the selected high-speed machine priority mode or low-speed machine priority mode is distributed to another type of generator or economic load. According to the configuration of allocating to the schedule value, in addition to the effects of the first embodiment, it is possible to arbitrarily select which of the high-speed device and the low-speed device is preferentially allocated the remaining distribution. Therefore, operation according to the driving situation is possible.

  Further, this embodiment may be combined with the second embodiment. In this case, the AR distribution unit 26 may execute the execution step C of the automatic frequency adjustment mode prior to the common distribution amount / correction amount calculation step E.

<Fourth Embodiment: Frequency Band Selection Method>
FIG. 14 is a flowchart for explaining the AR distribution processing of the AR distribution unit 26 according to the fourth embodiment.

  In the second embodiment, the method of automatically adjusting the frequency band according to the operation system of the generators in parallel has been described. However, depending on the operating conditions, it is necessary to adjust the frequency band based on the operator's idea, and a manual adjustment function is required. Therefore, in the present embodiment, the AR distribution unit 26 has a function that allows the operator to select whether the frequency band is automatically adjusted or manually adjusted.

  Specifically, the AR distribution unit 26 includes the following functions (f4-1) to (f4-3) in addition to the functions of the second embodiment.

  (f4-1) Mode selection function that selects either automatic adjustment mode or manual adjustment mode in advance.

(f4-2) Richo integer function by the selection of the automatic adjustment mode (the above-mentioned functions (f2-1) ~ (f2-3)) operation is to function.

(F4-3) manual adjustment mode operated by selecting, in response to operation of the operator, and the frequency band range high-speed machine is shared, the manual adjustment mode execution function of adjusting the frequency band range low-speed machine is shared.

  Next, the operation of the AR distribution unit 26 configured as described above will be described with reference to FIG.

  First, the AR distribution unit 26 executes the execution step B of the frequency band adjustment mode. That is, for example, the AR distribution unit 26 displays an inquiry as to whether or not to automatically set the frequency band on a display unit (not shown) (step B1), and automatically sets the frequency band according to the operation of the operator. If so, the frequency band automatic adjustment mode is selected (step B2). If not, the frequency band manual adjustment mode is selected (step B3).

  Subsequently, when the frequency band automatic adjustment mode is selected in step B2, the AR distribution unit 26 executes the process shown in FIG. 11 or FIG. 12, and then executes the common step E.

Moreover, AR allocation unit 26, when the frequency band the manual adjustment mode is selected in step B3, in accordance with the operation of the operator, and the frequency band range high speed machines share a frequency band range low-speed machine share After that , the common step E is executed.

According to the present embodiment as described above, select one of the pre-automatic adjustment mode or manual adjustment mode, short period of adjusting the frequency band range in accordance with the adjustment mode selected, frequency resolution and areas required power The component, medium cycle component, and long cycle component are extracted according to the time width of the cycle component corresponding to the frequency band, and each component is distributed, so that in addition to the effect of the second embodiment, the regional required power (AR ) Can be arbitrarily determined as a time width. Therefore, operation in accordance with the operator's idea becomes possible.

  Further, this embodiment may be combined with the first embodiment. In this case, the AR distribution unit 26 may execute the execution step H of the high-speed machine priority mode or the execution step L of the low-speed machine priority mode described in the first embodiment after the execution of the common step E.

  Furthermore, this embodiment may be combined with the third embodiment in addition to the first embodiment. In this case, the AR distribution unit 26 may execute steps A, B, C (or D), E, H (or L) as shown in FIG.

  According to at least one of the embodiments described above, the configuration in which periodic components that cannot be distributed are distributed to another type of generator with a large adjustment capacity, and when the adjustment capacity of the generator is small or the operation system is biased, It is possible to suppress the occurrence of residual distribution of regional required power.

  Note that the methods described in the above embodiments are, as programs that can be executed by a computer, magnetic disks (floppy (registered trademark) disks, hard disks, etc.), optical disks (CD-ROMs, DVDs, etc.), magneto-optical disks. (MO), stored in a storage medium such as a semiconductor memory, and distributed.

  In addition, as long as the storage medium can store a program and can be read by a computer, the storage format may be any form.

  In addition, an OS (operating system) running on a computer based on an instruction of a program installed in the computer from a storage medium, MW (middleware) such as database management software, network software, and the like realize the above-described embodiment. A part of each process may be executed.

  Furthermore, the storage medium in each embodiment is not limited to a medium independent of a computer, but also includes a storage medium in which a program transmitted via a LAN, the Internet, or the like is downloaded and stored or temporarily stored.

  Further, the number of storage media is not limited to one, and the case where the processing in each of the above embodiments is executed from a plurality of media is also included in the storage media in the present invention, and the media configuration may be any configuration.

  The computer in each embodiment executes each process in each of the above embodiments based on a program stored in a storage medium, and a single device such as a personal computer or a plurality of devices are connected to a network. Any configuration of the system or the like may be used.

  In addition, the computer in each embodiment is not limited to a personal computer, and includes an arithmetic processing device, a microcomputer, and the like included in an information processing device, and is a generic term for devices and devices that can realize the functions of the present invention by a program. Yes.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Power system, 2 ... Computer, 3 ... Other system, 4 ... Interconnection line, 5 ... MMI (man machine interface), 201-20n ... Generator output input part, 211-21n ... Generator information input part, 221 ˜22n ... target command value calculation unit, 231 ... 23n ... command value transmission means, 24 ... AR calculation unit, 25 ... AR decomposition unit, 26 ... AR distribution unit, 27 ... power generation end total demand calculation unit, 28 ... online predicted demand , 29... The previous day operation planning unit, 30... ELD schedule calculation unit, 311 to 31 n.

Claims (6)

A frequency change amount detecting means for detecting a frequency change amount of the power system;
Interconnection line flow amount variation detecting means for detecting the interconnection line flow amount variation amount of the power system,
Regional required power calculating means for calculating regional required power based on the frequency change amount and the interconnected power flow change amount;
Frequency resolving means for frequency resolving the calculated regional demand power;
Regional demand power distribution means for distributing the frequency-resolved regional demand power for each generator;
Target command value calculating means for calculating a target command value from the allocated regional demand power and the economic load distribution schedule value calculated by the economic load distribution control;
A load frequency control system comprising command value transmission means for transmitting the calculated target command value to the generator,
The regional demand power distribution means is:
When the adjustment surplus of the high speed machine of the generator and the adjustment surplus of the low speed machine of the generator are calculated, and the adjustment surplus of the high speed machine is greater than the adjustment surplus of the low speed machine, the threshold surplus while increasing the frequency band range in which the high-speed machine is shared, reducing the frequency band range in which the low-speed machine is shared, when the adjustment reserve capacity of the low-speed machine is greater than a threshold value than adjustment reserve capacity of the high-speed machine while increasing the frequency band range in which the low-speed machine to share, load frequency control system, characterized in that the high-speed machine with a small to that adjustment means a frequency band range to be shared. The load frequency control system according to claim 1,
The regional demand power distribution means is:
Mode selection means for selecting either the automatic adjustment mode or the manual adjustment mode in advance;
And means for operating the front Sulfur butterfly integer unit by the selection of the automatic adjustment mode,
Operates by selection of the manual adjustment mode, in response to operation of the operator, and the frequency band range in which the high-speed machine is shared, and manual adjustment mode executing means for adjusting the frequency band range in which the low-speed machine is shared,
A load frequency control system, further comprising: The load frequency control system according to claim 2,
The regional demand power distribution means is:
Extracting the short period component, medium period component and long period component of the frequency-resolved regional demand power according to the time width of the period component according to the frequency band , allocating the short period component to the high speed machine, Distributing the medium cycle component to the low speed machine, adding the long cycle component to the economic load distribution schedule value, and if the short cycle component could not be allocated, the short cycle component that could not be allocated High-speed machine priority distribution means for further distributing the medium-cycle component that could not be allocated to the economic load distribution schedule value when the medium-cycle component could not be allocated to the low-speed machine. Feature load frequency control system. In the load frequency control system according to claim 3,
The regional demand power distribution means is:
Extracting the short period component, medium period component and long period component of the frequency-resolved regional demand power according to the time width of the period component according to the frequency band , allocating the short period component to the high speed machine, Distributing the medium cycle component to the low speed machine, adding the long cycle component to the economic load distribution schedule value, and if the medium cycle component could not be allocated, the medium cycle component that could not be allocated Distributing to high-speed machines, if the short-cycle component could not be allocated, low-speed machine priority distribution means for further adding the short-cycle component that could not be allocated to the economic load distribution schedule value,
Mode selection means for selecting either the high speed machine priority mode or the low speed machine priority mode in advance;
Means for operating the high speed machine priority distribution means by selection of the high speed machine priority mode;
Means for operating the low speed machine priority distribution means by selection of the low speed machine priority mode;
A load frequency control system, further comprising: The load frequency control system according to claim 2,
Extracting the short period component, medium period component and long period component of the frequency-resolved regional demand power according to the time width of the period component according to the frequency band , allocating the short period component to the high speed machine, Distributing the medium cycle component to the low speed machine, adding the long cycle component to the economic load distribution schedule value, and if the medium cycle component could not be allocated, the medium cycle component that could not be allocated A low-speed machine priority distribution means for allocating the short-cycle component that could not be allocated to the high-speed machine and further adding the short-cycle component that could not be allocated to the economic load distribution schedule value; Feature load frequency control system. A program used in a computer that operates as a part of the load frequency control system according to any one of claims 1 to 5,
The computer,
The program for functioning as said area demand power calculation means, said frequency decomposition means, said area demand power distribution means, said target command value calculation means, and said command value transmission means.

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