JP2015154637A - Power supply system and program for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system and its program capable of suppressing influence of a fringe component by changing its degree of smoothing so as to weaken the degree of smoothing the current total demand in the case that steep change in a long period occurs and strengthen the degree in the case other than the occurrence of the steep change.SOLUTION: A power supply system comprises: a current total demand calculation unit 31 for calculating current total demand 51 from current power generation output of a power generator 10; a smoothing unit 32 for smoothing the current total demand 51 to calculate smoothed current total demand 52; a smoothing degree change unit 33 for changing a smoothing degree of the smoothing unit 32; a prediction total demand curve change unit 34 for calculating a modified prediction total demand curve 54 by modifying a prediction total demand curve so that the prediction total demand curve agrees with the smoothed current total demand 52 at current time; and a power generator control unit 35 for calculating power generator output to maintain power supply/demand balance, from the modified prediction total demand curve 54 and the current power generation output of the power generator 10.

Description

  Embodiments described herein relate generally to a power supply system that controls the output of a generator installed in a power system and a program therefor.

  In order to maintain a balance between power demand and supply, a power feeding system that controls the output of a generator installed in a power system is used. In the power feeding system, the current total demand is calculated from the information on the current output of the generator, the generator output command value is calculated based on the current total demand, and is transmitted to the generator to control the output value of the generator.

  Generally, the demand includes a load component called a fringe component that fluctuates sharply in a short cycle of several seconds to several minutes. Since the calculation of the generator output command value is performed based on the current total demand including this component, this component is reflected in the generator output command value. That is, the load component called the fringe component appears on the chattering or hunting of the generator output command value and adversely affects the control of the generator. Therefore, in the conventional power supply system, the influence of the fringe is removed by performing smoothing to remove the short-period fluctuation component from the current total demand.

JP 2009-142107 A

  However, the demand may change sharply to some extent with a long period (ten minutes to several tens of minutes), for example, a time zone from 12:00 to 13:00 on weekdays. There is a problem that the control of the generator is delayed with respect to a change in demand. That is, as shown in FIG. 10, when the total demand changes sharply after a few tens of minutes to several tens of minutes, if the degree of smoothing is strong, the change works. After that, the total demand after smoothing out catches up with the change in the actual total demand, but the generator output command value is output according to the total demand after smoothing, so it matches the actual total demand, so the generator Control will be delayed.

  Therefore, in a conventional power supply system that can only keep the degree of smoothing constant, it is necessary to weaken the degree of smoothing so that there is no delay effect on the generator control with respect to the sudden change in the long cycle of the current total demand. there were. However, if smoothing is performed in a state where the degree of smoothing is weakened, the influence of the fringe cannot be sufficiently removed in a system having a large influence of the fringe.

  The power supply system according to the present embodiment has been made to solve the above-described problems. When a long-cycle sharp change occurs, the degree of smoothing of the current total demand is weakened. It is an object of the present invention to provide a power feeding system and a program for the power feeding system that can suppress the influence due to the fringe component by changing to be strengthened in some cases.

  In order to achieve the above object, the power supply system of the present embodiment maintains a power supply-demand balance based on the total power demand at a certain time of the power system and the predicted total demand curve predicted in the power system. In the power supply system for controlling the generator installed in the electric power system, total demand calculating means for calculating the total demand at the time of the electric power system, and smoothing the calculated total demand, A smoothing means for calculating demand; a smoothing degree changing means for changing the degree of smoothing; and the predicted total demand curve so that the predicted total demand curve coincides with the smoothed total demand at the time. A revised forecast total demand curve changing means for calculating a revised forecast total demand curve, and a generator for calculating a generator output that maintains a power supply-demand balance based on the revised forecast total demand curve. A machine control unit, characterized by comprising a.

  In addition, a program used in the power supply system further including a storage unit that stores a correspondence relationship between the time zone and the smoothing degree is also an aspect of the present invention.

1 is a block diagram illustrating an overall configuration of a power feeding system according to a first embodiment. It is a figure of the time constant table which shows the correspondence of a time slot | zone and a time constant. It is a flowchart which shows operation | movement of the electric power feeding system which concerns on 1st Embodiment. It is a block diagram which shows the whole structure of the electric power feeding system which concerns on 2nd Embodiment. It is a figure of the time constant table which shows the correspondence of the combination of a time slot | zone and predetermined weather conditions, and a time constant. It is a block diagram which shows the whole structure of the electric power feeding system which concerns on 3rd Embodiment. It is a block diagram which shows the whole structure of the electric power feeding system which concerns on the modification of 3rd Embodiment. It is a block diagram which shows the whole structure of the electric power feeding system which concerns on 4th Embodiment. It is a figure for demonstrating operation | movement of the electric power feeding system which concerns on 4th Embodiment. It is a figure for demonstrating the change of a total demand by smoothing with respect to the change of a steep demand.

[First Embodiment]
(Outline configuration)
Below, the whole structure of the electric power feeding system of this embodiment is demonstrated, referring FIG. 1 and FIG. FIG. 1 is a block diagram showing the overall configuration of the power feeding system of the present embodiment.

  The power feeding system of the present embodiment receives current output information of generators 11, 12,... 1n (hereinafter simply referred to as generator 10 when collectively referred to) installed in the power system, and includes the information Based on the current total demand 51 calculated based on the predicted total demand curve assumed in advance, the generator 10 is controlled so as to maintain the power supply-demand balance.

  The power supply system includes a single computer or a plurality of computers connected via a network. This power supply system stores a program in an HDD, an SSD, etc., is appropriately expanded in a RAM, and processed by the CPU, thereby calculating the current total demand 51 from the current output information of the generator 10 and the current total demand. 51 smoothing processing, calculation of the output command value to the generator 10, etc. are performed.

  Specifically, the power supply system includes an information transmission device 30, a current total demand calculation unit 31, a smoothing unit 32, a smoothing degree changing unit 33, an expected total demand curve correcting unit 34, and a generator control. Part 35.

(Detailed configuration)
The information transmission device 30 connects the power feeding system and the generators 11, 12,... 1n installed in the power system. That is, the information transmission device 30 is configured to be able to receive the current output of each of the generators 11, 12,... 1 n, and the generator output command value 55 calculated by the generator control unit 35 is set to each of the generators 11, 12, ... configured to transmit to 1n. The information transmission device 30 includes a memory, and the current output received from each of the generators 11, 12,... 1 n is stored as a generator current output (hereinafter simply referred to as a “generator current output 50”). To remember. The information transmission device 30 is connected to the current total demand calculation unit 31 and the generator control unit 35, and transmits the generator current output 50 to them.

  The current total demand calculation unit 31 is configured mainly including a processor, and calculates the current total demand 51 by adding the respective generator current outputs 50 input from the information transmission device 30. The current total demand calculation unit 31 is connected to the smoothing unit 32 and outputs the calculated current total demand 51 to the smoothing unit 32.

  The smoothing unit 32 is a low-pass filter configured to include a computer, smoothes the current total demand 51 to calculate a current total demand 52 after smoothing, and corrects the current total demand 52 after smoothing to an expected total demand curve correction. To the unit 34.

  The low-pass filter is a digital filter. For example, a first-order lag digital filter obtained by converting an analog RC circuit using a resistor or a capacitor into a digital signal or a moving average filter can be used, and is implemented in a computer as software. .

  This low-pass filter removes the fringes included in the current total demand 51 based on the smoothing degree set by the smoothing degree changing unit 33 described later. That is, smoothing means removing the short cycle fluctuation component of the current total demand 51, and the current total demand 51 includes a fringe component that is a short cycle fluctuation component of several seconds to several minutes. .

  The degree of smoothing is determined by the cutoff frequency, which is given as a time constant. That is, the cutoff frequency has an inversely proportional relationship with the time constant, and in this embodiment, the degree of smoothing is determined by the time constant.

  The smoothing degree changing unit 33 changes the smoothing degree (time constant) of the smoothing unit 32 according to a predetermined standard. The change criterion of this embodiment is the current time. That is, the smoothing degree changing unit 33 is configured to be able to detect the current time using a clock or the like, and includes a memory 33a. As shown in FIG. 2, the memory 33a stores in advance a table in which time constants τ1 to τ24 are determined for each time zone. In this time constant table, values that weaken the degree of smoothing are set in advance in the time period in which the long period is steeply changed, and other time periods (for example, the time period that fluctuates in the short period and the fluctuation are not so much). In a non-elapsed time zone, etc.), a value for increasing the degree of smoothing is set in advance.

  In addition, the time constant of each time slot | zone can be defined as follows. That is, since the fluctuation pattern of the demand in one day can be roughly grasped only from the time zone based on the past demand results, the time constant of each time zone determined based on the pattern is preset in the memory 33a as a table. I can leave.

  In this specification, reducing or increasing the degree of smoothing is determined by the relationship between the time constant of the time zone including the current time and the time constant of the previous time zone. That is, if the time constant of the time zone that includes the current time is smaller than the time constant of the previous time zone, the cut-off frequency will increase, so it is said to “reduce the degree of smoothing”. The time zone that includes the current time If the time constant of is greater than the time constant of the previous time zone, the cutoff frequency becomes smaller, so “increase the degree of smoothing”.

  In addition, the smoothing degree changing unit 33 includes a time zone determining unit 33b that determines which time zone the current time belongs to. The smoothing degree changing unit 33 uses the time zone determining unit 33b to determine the time zone to which the detected current time belongs, and obtains a time constant corresponding to the time zone from the table of time constants in the memory 33a.

  In the present embodiment, the smoothing degree changing unit 33 sequentially stores the time zone determined by the time zone determining unit 33b in the memory 33a in association with the current time. Thereby, the smoothing degree changing unit 33 determines whether or not the time zone determined by the time zone determining unit 33b is the same as the time zone determined immediately before. When the time period is the same, the time constant is the same, so the time constant is not output to the smoothing unit 32. When the time period is different, the time constant is different, and the time constant is output to the smoothing unit 32. As described above, the time constant corresponding to the time zone including this time is obtained using the current time as an index, and the smoothing degree of the smoothing unit 32 is changed.

  An example of the change of the smoothing degree is shown. If the current total demand 51 changes sharply between 11:00 and 14:00 on weekdays and between 12:00 and 13:00, and there is not much change other than that, the time constant is set to τ12 in the time zone from 11:00 to 12:00. In order to avoid the delay of control of the generator 10 in the time zone from 12:00 to 13:00, the time constant is reduced to τ13 and the degree of smoothing is weakened. In the time zone from 13:00 to 14:00, the time constant is increased as τ14 and the degree of smoothing is increased. It should be noted that the magnitude relationships of the time constants τ12 and τ13 and the time constants τ13 and τ14 are τ12> τ13 and τ13 <τ14.

  In the above, the table of time constants is for every hour of every hour in the above, but is not limited to this, and the start and end of each time zone may be arbitrary, such as 11: 52-12: 52. . In addition, the length of the time zone is not limited to one hour, and it may be shorter or longer, and it may be longer from 11:52 to 12:30, from 12:30 to 14:45. The length may be different. For example, in the time zone from 11:30 to 13:30 and from 14:30 to 16:00, the time constant is 10 minutes, and in the other time zones, the time constant is 30 minutes. In addition, time constants are prevented from overlapping at the end of a certain time zone and the start of the next time zone. As shown in the above example, twelve o'clock may be set to τ13 instead of τ12, or vice versa.

  As described above, the smoothing degree changing unit 33 changes the time constant of the smoothing unit 32 to a time constant corresponding to the current time, and the smoothing unit 32 changes the time constant set by the smoothing degree changing unit 33. Based on the smoothing.

  The predicted total demand curve correction unit 34 mainly includes a processor and a memory, and corrects the predicted total demand curve from the predicted total demand 53 that has been predicted and the current total demand 52 that has been smoothed. The demand curve 54 is calculated. The predicted total demand 53 used for the calculation is input from the outside of the power feeding system, for example, as a predicted total demand curve and stored in the memory in advance. The power supply system may calculate the expected total demand 53 in advance and store it in the memory. Further, the predicted total demand curve correction unit 34 outputs the calculated corrected predicted total demand curve 54 to the generator control unit 35.

  The generator control unit 35 calculates the output upper and lower limit constraints of the generators 11, 12,..., 1n from the generator current output 50, and calculates the total demand and the total output of the generator 10 from the corrected predicted total demand curve 54. And the generator output command value 55 is calculated so that the total fuel cost is minimized. A known method can be adopted for these calculations. The generator control unit 35 transmits the calculated generator output command value 55 to the generator 10 via the information transmission device 30.

(Operation)
The operation of such a power feeding system will be described below. FIG. 3 is a flowchart showing the operation of the power feeding system. In the following description, the initial smoothing level of the smoothing unit 32 is set in advance. Further, the order of operations in the flowchart of FIG. 3 is an exemplification, and the operation of the present embodiment is not necessarily limited to this order.

  First, the information transmission device 30 receives current output information from each of the generators 11, 12,..., 1n, and transmits this to the current total demand calculation unit 31 (step S01). The current total demand calculation unit 31 calculates the current total demand 51 by adding the received current output of the generator 10 (step S02), and transmits the calculated current total demand 51 to the smoothing unit 32.

  Here, the smoothing degree changing unit 33 detects the current time and determines a time zone in which the detected current time is included (step S03). Next, it is determined whether or not the determined time zone is the same as the time zone determined immediately before (step S04).

  If the time zone is different (NO in step S04), the time constant is changed to a time zone corresponding to the time zone including the current time. That is, the smoothing degree changing unit 33 acquires a time constant corresponding to a time zone including the current time, and outputs the time constant to the smoothing unit 32 (step S05). The smoothing unit 32 smoothes the current total demand 51 based on the changed time constant, and outputs the current total demand 52 after smoothing to the predicted total demand curve correction unit 34 (step S06). On the other hand, if it is the same time zone (YES in step S04), the current total demand 51 is smoothed while the time constant is not changed and the time constant is maintained, and the smoothed current total demand 52 is calculated as the expected total demand curve. It outputs to the correction part 34 (step S06).

  The predicted total demand curve correction unit 34 acquires the predicted total demand curve from the memory (step S07), corrects the predicted total demand curve based on the current total demand 52 after smoothing, and calculates the corrected predicted total demand curve 54. Then, the calculation result is output to the generator control unit 35 (step S08).

  The generator control unit 35 receives the generator current output 50 from the information transmission device 30, and calculates the output upper and lower limit constraints of the generator 10 from this current output (step S09). Further, within this constraint, the generator output designated value 55 is calculated so that the total fuel cost is minimized while matching the total demand of the corrected expected total demand curve 54 and the total output of the generator 10 (step) S10), and transmits to the generator 10 via the information transmission device 30 (step S11). As described above, the power supply system controls the generator 10 so as to maintain a power supply / demand balance.

(Action / Effect)
(1) The power feeding system of the present embodiment includes a smoothing unit 32 and a smoothing degree changing unit 33, and is configured to be able to change the degree of smoothing according to a predetermined standard. As a result, when a long-period steep fluctuation occurs, the level of smoothing of the current total demand 51 can be weakened, and in other cases, it can be switched to increase. For this reason, even if the system has a large influence on the fringe, it is possible to remove the fringe by reducing the influence of the control delay of the generator 10 for a long period of steep fluctuations. Thus, it is possible to obtain a power feeding system that can sufficiently eliminate the influence of the fringe.

(2) In this embodiment, the target time is the current time, and the current total demand calculation unit 31 calculates the current total demand 51 based on the generator current output 50 of the generator 10. That is, the total demand is calculated by regarding the current output 50 of the generator 10 as the supply amount as demand. Thereby, it is not necessary to acquire the demand amount of each consumer in the power system, and the output command value of the generator can be calculated smoothly.

(3) In the present embodiment, the smoothing degree changing unit 33 includes a time constant table in which the current time is associated with the smoothing degree (time constant). This time constant table is set in advance to a value that weakens the degree of smoothing in a time zone in which a long-period steep fluctuation occurs, and to a value that increases the degree of smoothing in other time zones. Thereby, the degree of smoothing can be changed according to time.

[Second Embodiment]
(Constitution)
A second embodiment will be described with reference to FIGS. 4 and 5. The basic configuration of the second embodiment is the same as that of the first embodiment. Only the differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 4 is a block diagram illustrating an overall configuration of a power feeding system according to the second embodiment. The power supply system of the present embodiment changes the time constant according to the past demand fluctuation pattern that matches the current time and current weather data. That is, the present power supply system includes a current weather data receiving unit 36 that receives current weather data including date and time, temperature, weather, and the like from the outside and transmits the current weather data to a smoothing degree changing unit 37 described later, and the current time and current weather data. And a smoothing degree changing unit 37 that changes the time constant based on the trend of demand fluctuations with a period of about ten minutes to several tens of minutes in the past conditions obtained from the past demand record database 57 recorded in advance. It has.

  The smoothing degree changing unit 37 is configured to change the time constant in consideration of parameters that greatly affect the power demand such as date and time, temperature, and weather. For example, the time constant table is configured such that the time constant is uniquely determined according to a combination of parameters that greatly affect power demand such as date, temperature, and weather. The time constant is preset to a time constant that matches the past demand fluctuation pattern in the combination. When the demand changes sharply, the value of the time constant is set to a small value, and when there is almost no change, the value of the time constant is set to a large value.

  In the following, for the sake of simplicity, the current time (time zone) and the temperature having a strong correlation with demand fluctuation will be described as parameters. In the time constant table, as shown in FIG. 5, a time constant for each temperature (for example, a temperature range of 0 ° C. to 40 ° C. at intervals of 1 ° C.) is set in advance. The range of temperature and the width of the temperature range can be changed as appropriate.

  For example, in the past case, when the temperature is 25.5 ° C. in the time zone from 11:00 to 12:00 and the time constant is τ1226 and the time constant is τ1226, the subsequent time zone from 12:00 to 13:00 In this case, the temperature rises to 32.4 ° C., the demand fluctuates (rises) rapidly, and the time constant is weakened to τ1333 (<τ1226). In such a case, in the time constant table, a time constant τ 1226 is preset in the time zone from 11:00 to 12:00 and the temperature is 25 ° C. to 26 ° C., and the time zone from 12:00 to 13:00, the temperature is from 32 ° C. A time constant τ 1333 is set in advance under the condition of 33 ° C.

  The smoothing degree changing unit 37 includes a temperature zone determination unit 37c that determines in which temperature zone of the time constant table the current temperature included in the received current weather data is included in the first embodiment. The time zone determination unit 37b and the time zone determination by the temperature zone determination unit 37c are performed. That is, the time constant corresponding to the determined time zone and temperature zone is changed.

  In the time constant table as described above, when the current time is 11:32 and the temperature is 25.2 ° C., the time constant is set to τ1226 and smoothing is performed, and then the current time is 12:15. When the temperature is 32.3 ° C., the time constant is changed to τ 1333 and smoothing is performed.

(Action / Effect)
The power supply system according to the present embodiment includes a smoothing degree changing unit 37 having a time constant table based on past demand fluctuation patterns in a plurality of weather conditions. Thereby, the change of the smoothing degree matched with the demand fluctuation pattern in the past weather conditions suitable for the weather conditions containing the present several parameter can be performed. That is, since the time constant is changed in consideration of not only the current time but also parameters correlated with demand fluctuations such as temperature and weather, the influence of the fringe can be removed more appropriately than in the first embodiment. .

[Modification of Second Embodiment]
Although the smoothing degree changing unit 37 of the second embodiment uses a table of time constants, the smoothing degree changing unit of the present modification calculates a time constant using a function. This function type is determined based on past demand record data, includes weather parameters such as time and temperature as parameters, and is stored in the memory as part of the program. The smoothing degree changing unit calculates a time constant by substituting, as a numerical value, a parameter that greatly affects power demand such as temperature and weather from the current time and acquired current weather data.

  Note that the function for calculating the time constant is also included in the correspondence relationship of the time constant with respect to a combination of time and a predetermined weather condition including temperature.

  As described above, even when the time constant is calculated using a function and the degree of smoothing is changed, the same effect as that of the second embodiment can be obtained.

[Third Embodiment]
(Constitution)
A third embodiment will be described with reference to FIG. The basic configuration of the third embodiment is the same as that of the second embodiment. Only differences from the second embodiment will be described, and the same parts as those of the second embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 6 is a block diagram illustrating an overall configuration of a power feeding system according to the third embodiment. The power supply system according to the third embodiment includes an input unit 38 that accepts correction of an operator's smoothing degree change. The input unit 38 can use a mouse, a keyboard, a touch panel, or a combination thereof.

  In the second embodiment, the time constant is changed in accordance with the past demand fluctuation pattern. However, even if the current weather data matches the past weather data, the current or near future event (World Cup The demand fluctuation pattern may differ depending on the game, the Koshien final, etc.). In such a case, parameter input is received by the input unit 38, and the time constant is changed in consideration of the input. The parameter to be accepted may be a weather condition or a parameter that adjusts the time constant itself.

  For example, when the temperature is given as an example of the weather condition, if the current temperature is 31.2 ° C., the smoothing degree becomes a time constant corresponding to the temperature range of 31 ° C. to 32 ° C. (32 It is mentioned to make it the time constant of temperature zones, such as (degreeC-33 degreeC) or lower (30 degreeC-31 degreeC). In this case, for example, the input unit 38 receives an input of air temperature + α ° C. by the operator, and outputs the input information to the temperature zone determination unit 37c. The temperature zone determination unit 37c recognizes the current temperature as 31.2 + α ° C. by adding + α ° C. to 31.2 ° C. of the current weather data, and determines in which temperature zone this temperature is included. On the other hand, when adjusting the time constant itself, the current time constant value may be adjusted up or down by 10%.

(Action / Effect)
In the power supply system of the present embodiment, this makes it possible to change the time constant more appropriately than in the second embodiment, and to obtain a power supply system that can further eliminate the influence of the fringe. .

[Modification 1 of the third embodiment]
Modification 1 of the third embodiment is a modification of the smoothing degree change unit of the modification of the second embodiment, in which the time constant is changed and the function type of the time constant is corrected by inputting parameters by the input unit 38. To do. For example, taking into account current or future events based on the operator's knowledge and experience, change the numerical value of the weighting factor included in the function type, or set the weather parameters such as the temperature input to the function higher than the actual temperature, etc. The time constant is calculated by inputting a low value.

  Thereby, in addition to the past demand performance data, since an operator's knowledge and experience can be reflected, the electric power feeding system which can remove the influence of a fringe more can be obtained.

[Modification 2 of the third embodiment]
The electric power feeding system which concerns on the modification 2 of 3rd Embodiment is comprised so that the present and future weather data can be acquired from the outside. For example, as shown in FIG. 7, the current weather data is acquired from the current / future weather data 58 by the current weather data receiving unit 36, and the future weather data (predicted weather value) is input to the future by the input unit 38. Acquired by functioning as a weather data receiver. Or you may receive and acquire by the information transmission apparatus 30. FIG. The acquired future weather data is transmitted to the smoothing degree changing unit 41 and contributes to correction of the smoothing degree. That is, in this modification, the operator does not directly correct the time constant, but acquires current and future weather data from the outside and automatically corrects the time constant.

As a specific example, the smoothing degree changing unit 41 according to the second modification of the third embodiment calculates the time constant of the low-pass filter of the smoothing unit 32 using the following Equation 1.
(Formula 1) T = AX

  Here, T is a time constant (scalar amount). X is a determinant (vector quantity) of a time constant, and is meteorological data such as current and near future temperature and weather. Current and future weather data acquired from the outside is used for this X. A is a time constant calculation matrix, and the past demand record database 57 determines the value of each component of this matrix.

  Since the time constant T calculated by Equation 1 includes not only current weather data but also future weather data, the time constant T is corrected from the time constant calculated only from the current weather data. . Since the determinant X of the time constant is a combination of time and weather data, the relationship of Equation 1 is included in the correspondence between the combination of the time zone and predetermined weather conditions and the degree of smoothing.

  As described above, it is possible to obtain a power feeding system that can automatically correct the time constant and can eliminate the influence of the fringe.

[Fourth Embodiment]
(Constitution)
A fourth embodiment will be described with reference to FIGS. 8 and 9. The basic configuration of the fourth embodiment is the same as that of the first embodiment. Only the differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 8 is a block diagram illustrating an overall configuration of a power feeding system according to the fourth embodiment. The power supply system according to the fourth embodiment includes an error calculation unit 39 that calculates an error of the predicted total demand 53 from the corrected predicted total demand curve 54 and the predicted total demand curve at each time, and an error integration that integrates the errors. And a unit 40. Further, the smoothing degree changing unit 33 further includes a monitoring unit 33 c that monitors the integration error calculated by the error integration unit 40. The monitoring unit 33c determines whether or not the integration error calculated by the error integration unit 40 is equal to or greater than a predetermined reference stored in the memory 33a in advance. This standard can be appropriately changed according to the power system.

  The smoothing degree changing unit 41 determines that the degree of smoothing is too strong when the monitoring unit 33c determines that the integrated error is equal to or greater than a predetermined reference stored in the memory 33a, and smoothing is performed. The level of smoothing is switched to weaken the level. For example, as shown in FIG. 9, when a long-period steep demand fluctuation occurs, if the degree of smoothing is too strong, an error E that is the difference area between the predicted total demand curve 53 and the corrected predicted total demand curve 54 is Accumulate. When the error E is equal to or greater than a predetermined reference, it is determined that the error E is too smooth. In this case, since the control of the generator 10 tends to be delayed, the degree of smoothing is switched so as to weaken the degree of smoothing. The code | symbol 56 of FIG. 9 is the estimated forecast total demand curve after switching. It should be noted that the integration error can be both a positive value and a negative value depending on whether the total demand rises sharply or falls.

  On the other hand, when the integration error is less than a predetermined reference, the smoothing degree changing unit 33 does not change the smoothing degree and keeps the time constant of the time zone including the current time.

(Action / Effect)
The power supply system of the present embodiment further includes an error calculating unit 39, an error integrating unit 40, and a monitoring unit 33c, and the monitoring unit 33c monitors the integrated error obtained by the error calculating unit 39 and the error integrating unit 40. did. That is, when the integrated error is equal to or greater than a predetermined reference stored in advance in the memory 33a, the degree of smoothing is determined to be too strong, and the degree of smoothing is switched to a weakening degree. As a result, even when there is a demand fluctuation trend that has not been recorded in the past, the level of smoothing is appropriately changed, and smoothing is not continued in an incorrect state. Therefore, it is possible to obtain a power feeding system in which the influence of the fringe is appropriately removed.

[Other Embodiments]
In the present specification, a plurality of embodiments according to the present invention have been described. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. Specifically, a combination of all or any of the first to fourth embodiments is also included. The above embodiments can be implemented in other various 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 invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

(1) In the first to fourth embodiments, in the information transmission device 30, the smoothing degree changing units 33 and 37, and the predicted total demand curve correcting unit 34, the generator current output 50, the time constant table, the predicted total A memory that stores the demand 53 in advance is included, but a memory may be provided separately from the information transmission device 30, the smoothing degree changing units 33 and 37, and the predicted total demand curve correcting unit 34.

(2) In the first to fourth embodiments, the smoothing degree changing units 33 and 37 themselves detect the current time by a clock or the like, but the generator current output 50 is the current time and the current output of the generator. And the smoothing degree changing units 33 and 37 may detect the current time.

(3) In the second and third embodiments, the current weather data receiving unit 36 is provided to receive current weather data from the outside. However, the power supply system itself has a configuration for performing current weather observation. You may make it acquire the present weather data.

(4) In the fourth embodiment, when the integration error is equal to or greater than the predetermined reference, the time constant is simply switched. However, it may be corrected so as not to cause an error. For example, the time constant may be changed according to the integration error so that the increase rate of the integration error decreases. For example, if the degree of integration error is large, the change width of the time constant is increased, and if the degree of integration error is small, the change width of the time constant is reduced.

(5) The power supply systems of the first to fourth embodiments calculate the output command value of the generator so as to maintain the power supply-demand balance at the current time. The output command value of the generator may be calculated so as to maintain the supply and demand balance of power at the time of. Such a power supply system or a program thereof can be used as a simulator, for example. That is, instead of the current total demand calculation unit 31, a total demand calculation unit is used, and a generator output at a past time, for example, is given thereto. When smoothing the past total demand calculated by the total demand calculation unit, it is possible to examine how much time constant the fringe component can be removed more appropriately.

10, 11, ..., 1n Generator 30 Information transmission device 31 Current total demand calculation unit 32 Smoothing unit 33 Smoothing degree change unit 33a Memory 33b Time zone determination unit 33c Monitoring unit 34 Expected total demand curve correction unit 35 Generator control Unit 36 Current weather data receiving unit 37 Smoothing level changing unit 37a Memory 37b Time zone determining unit 37c Temperature zone determining unit 38 Input unit 39 Error calculating unit 40 Error integrating unit 41 Smoothing level changing unit 50 Current generator output 51 Current total Demand 52 Current total demand 53 after smoothing 53 Expected total demand 54 Corrected expected total demand curve 55 Generator output command value 56 Corrected expected total demand curve 57 Past demand result database 58 Current / future weather data E Error

Claims (7)

A power supply system that controls a generator installed in the power system so as to maintain a power supply-demand balance based on the total power demand at a certain time of the power system and an expected total demand curve predicted in the power system In
A total demand calculating means for calculating the total demand at the time of the power system;
A smoothing means for smoothing the calculated total demand and calculating the total demand after smoothing;
Smoothing degree changing means for changing the degree of smoothing;
A forecast total demand curve changing means for correcting the forecast total demand curve so that the forecast total demand curve matches the smoothed total demand at the time, and calculating a revised forecast total demand curve;
A generator control means for calculating a generator output that maintains a power supply-demand balance based on the corrected expected total demand curve;
A power supply system comprising: The time is the current time,
The power supply system according to claim 1, wherein the total demand calculation unit calculates the total demand based on a current power generation output of the generator. A storage means for storing the correspondence between the time zone and the smoothing degree;
The smoothing degree changing means includes a time zone determination unit that determines in which time zone the current time is included, and the smoothing degree of the smoothing means is determined based on the correspondence relationship of the storage means, The power supply system according to claim 2, wherein the power supply system is changed to a smoothing degree corresponding to the time zone determined by the time zone determination unit. The correspondence relationship of the storage means is a correspondence relationship between a combination of a time zone and a predetermined weather condition, and a smoothing degree,
The smoothing degree changing means changes the smoothing degree of the smoothing means to a smoothing degree corresponding to a combination of a time zone including a current time and the current predetermined weather condition. Item 4. The power feeding system according to Item 3. An input means for receiving an input for correcting the change in the smoothing degree;
The power supply system according to claim 4, wherein the smoothing degree changing unit changes the smoothing degree of the smoothing unit in consideration of input information received by the input unit. At each time, an error calculating means for calculating an error of the predicted total demand from the corrected predicted total demand curve and the predicted total demand curve;
Error accumulating means for accumulating the error, and
When the calculation result of the error integrating means is equal to or greater than a predetermined reference, the smoothing degree of the time zone including the current time is changed from the smoothing degree of the smoothing degree changing means to a smoothing degree that weakens the degree. The electric power feeding system in any one of Claims 1-5. A power supply system that controls a generator installed in the power system so as to maintain a power supply-demand balance based on the total power demand at a certain time of the power system and an expected total demand curve predicted in the power system In the program used for
The power supply system includes storage means in which a correspondence relationship between a time zone and a smoothing degree is stored,
On the computer,
A total demand calculation function for calculating the total demand at the time of the power system;
A smoothing function for smoothing the calculated total demand and calculating the total demand after smoothing;
A smoothing degree changing function for changing the smoothing degree;
A forecast total demand curve changing function for correcting the forecast total demand curve so that the forecast total demand curve matches the smoothed total demand at the time, and calculating a revised forecast total demand curve;
A generator control function for calculating a generator output that maintains a power supply-demand balance based on the corrected expected total demand curve; and
Power supply system program to realize