JP2018078679A - Unit number control device, unit number control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement operation with high power generation efficiency and high energy conservation efficiency by stopping supply devices, which are being operated unnecessarily, in an early stage on the basis of a prediction of a power load tendency.SOLUTION: A unit number control device 30 predicts a fluctuation tendency of a power load in a subsequent time zone. In a case where a load decrease tendency is predicted, the unit number control device 30 executes unit number control (energy saving mode operation) on the basis of an energy-saving-time start/stop condition 100B which changes a stop condition in such a manner that the number of operating CGSs 40 is easily decreased. Thus, a stop setting value of a hysteresis becomes a greater value than a stop setting value in normal operation. Therefore, the power load becomes lower than the stop setting value of the hysteresis in an early stage compared with the normal operation, and the CGSs 40, which are being operated unnecessarily, can be stopped in an early stage.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a number control device, a number control method, and a program, and more particularly to a technique for controlling the number of operating units of a plurality of supply devices that supply power.

  A cogeneration system (hereinafter also referred to as “CGS”) that supplies power from the energy center to each factory is controlled in accordance with the power load. In normal operation number control, when the power load exceeds a predetermined setting value (starting setting value), the standby unit starts, and when the power load falls below a predetermined setting value (stop setting value), one unit is stopped from the operating unit.

  At this time, if the start set value is close to the stop set value, the start and stop frequently occur due to minute fluctuations in the power load. Therefore, in general, a range is set between the two set values to avoid frequent start and stop. . This width is called “hysteresis” (see Patent Document 1).

FIG. 12 is a diagram for explaining the outline of the operation number control based on hysteresis. In the example of FIG. 12, based on the hysteresis defined by the activation set value h _n and stopping setpoint l _n, increasing the number of operating CGS from N units to N + 1 units, or decrease from N + 1 units in N base number It is an example which performs control. As shown in FIG. 12, N CGSs are operating at first. Thereafter, as shown in the figure, when the power load gradually rises and exceeds the hysteresis starting set value h _n , one CGS in standby is activated, and the number of operating units is controlled to be N + 1. Then, reduced power load gradually, below the stop setpoint l _n of the hysteresis, the CGS running is stopped one, the number of operating units is controlled to be N units. Here, when the power load changes within the hysteresis, the number of operating units is not increased or decreased. Thus, by providing a region where the number of operating units is not changed as a hysteresis, it is possible to avoid frequent start and stop due to minute fluctuations in the power load.

JP 2010-213454 A

  By the way, in general, the CGS can be operated with higher efficiency as the load factor is higher. FIG. 13 is a diagram illustrating the relationship between the load factor and the power generation efficiency. As shown in FIG. 13, it can be seen that the power generation efficiency of the CGS also increases in correlation with the increase in the load factor of the CGS.

However, if the power load decreases during operation of a plurality of CGSs and the power load continues to shift between the start set value and the stop set value (within hysteresis), the CGS continues to operate with a low load factor. As a result, power generation efficiency deteriorates. FIG. 14 is a diagram showing an example in which the power generation efficiency deteriorates. The example of FIG. 14 is an example in which the number of operating CGS is controlled to two or three based on the hysteresis defined by the start set value h ₂ and the stop set value l ₂ . In particular, in FIG. 14, after the power load rises and the number of operating CGSs increased from 2 to 3 initially, the power load decreased, and the power load continued to shift within the hysteresis in the time zone T in the figure. Yes. That is, in the time zone T, the three CGSs continue to operate with a low load factor, and the power generation efficiency of the CGS deteriorates.

In response to this problem, when the power load tends to decrease, the present inventor has an effect of improving the power generation efficiency by narrowing the hysteresis width and stopping CGS operating excessively at an early stage. We focused on what we get. FIG. 15 is a diagram illustrating an example in which power generation efficiency is improved. As shown in FIG. 15, when the power load starts to decrease, the hysteresis stop set value l ₂ in FIG. 14 is increased to the stop set value l ₂ ′ to narrow the hysteresis width. Thereby, CGS in operation can be stopped early. For example, in the time zone T in which three CGSs were operating in FIG. 14, it is possible to operate with two CGSs in FIG. At this time, since the load factor per CGS in the time zone T is larger than that in the case of FIG. 14, the power generation efficiency is not deteriorated as shown in FIG.

  The present invention has been made in view of the above-described viewpoints, and the object of the present invention is to quickly stop a supply device that is operating excessively based on prediction of a power load trend, thereby generating power efficiently. And a number control device, a number control method, and a program for realizing a high energy-saving operation.

  A first invention for achieving the above-described object is a unit control device for controlling the number of operating a plurality of supply devices that supply power to one or more supply destinations, and is operated based on a predetermined activation condition. When the number control unit that increases the number of units and decreases the number of operating units based on a predetermined stop condition, the prediction unit that predicts the future power load trend of the supply destination, and when the power load is predicted not to increase And a condition changing unit that changes the stop condition so that the number of operating units is likely to decrease. According to the first invention, when it is predicted that the power load of the supply destination will not increase in the future, the stop condition is changed so that the number of operating units is likely to decrease. Can be stopped early. Thereby, operation | movement of the supply apparatus with high electric power generation efficiency and energy saving property is implement | achieved.

  In the first invention, the predicting unit predicts a power load tendency in a predetermined time zone, and the condition changing unit predicts that the power load does not increase in the predetermined time zone. The stop condition may be changed during the time period. Thereby, the number control of the present invention can be executed while predicting the tendency of the power load for each time zone.

According to a first aspect of the present invention, there is provided a storage unit that stores a power load pattern created based on past power load data of the supply destination, and the prediction unit is configured to determine a power load pattern based on the power load pattern. You may comprise so that a tendency may be estimated. Thereby, the tendency of an electric power load can be predicted based on the past load results of a supplier such as a factory.
At this time, when the actual load tends to increase in a state where the stop condition is changed by the actual load acquisition unit that acquires the actual load of the supply destination and the condition change unit, the change of the stop condition And a compulsory condition change canceling unit that cancels. In addition, when the actual load tends to decrease in a state where the stop condition is not changed by the actual load acquisition unit that acquires the actual load of the supply destination, and the condition change unit, forcibly changing the stop condition And an objective condition changing unit. Thereby, flexible unit control in consideration of the actual load tendency in addition to the power load pattern is realized.

  In the first invention, the number control unit increases the number of operating units when the power load value exceeds a predetermined start setting value, and decreases the number of operating units when the power load value falls below a predetermined stop setting value, The condition changing unit may be configured to change the stop condition by increasing the stop set value. As a result, when the power load increases and exceeds the start set value (the upper limit value of hysteresis), the number of operating units is increased, and when the power load decreases and falls below the stop set value (the lower limit value of hysteresis), the number of operating units is decreased. In particular, when the load tends to decrease, the range of hysteresis is narrowed by increasing the stop set value, so that surplus operating supply devices can be stopped early and the remaining supply devices can be operated with high efficiency. It becomes possible to make it.

  A second invention is a number control method for a number control device for controlling the number of operating a plurality of supply devices that supply power to one or more supply destinations, and increases the number of operating devices based on a predetermined activation condition. , A unit control step for reducing the number of operating units based on a predetermined stop condition, a predicting step for predicting a future power load trend of the supply destination, and if the power load is predicted not to increase, And a condition changing step of changing the stop condition so as to be easily reduced. According to the second invention, when it is predicted that the power load of the supply destination will not increase from now on, the stop condition is changed so that the number of operating units is likely to decrease. Can be stopped early. Thereby, operation | movement of the supply apparatus with high electric power generation efficiency and energy saving property is implement | achieved.

  A third invention is a program for a number control device that controls the number of operating a plurality of supply devices that supply power to one or more supply destinations, and operates the number control device based on a predetermined activation condition. When the number control unit that increases the number of units and decreases the number of operating units based on a predetermined stop condition, the prediction unit that predicts the future power load trend of the supply destination, and when the power load is predicted not to increase The program is made to function as a condition changing unit that changes the stop condition so that the number of operating units is likely to decrease. By installing the program of the third invention, the number control device of the first invention can be realized and the number control method of the second invention can be executed.

  ADVANTAGE OF THE INVENTION According to this invention, the operation | movement with high electric power generation efficiency and energy-saving property is implement | achieved by stopping the supply apparatus which is operating excessively at an early stage based on prediction of an electric power load tendency.

The figure which shows the outline of energy supply system 1 The figure which shows the example of the hardware constitutions of the information terminal 10 and the number control apparatus 30 (A) Diagram showing normal start / stop condition 100A, (b) Diagram showing energy saving start / stop condition 100B The flowchart which shows the flow of the process which produces the electric power load pattern 300 The figure which represents typically the process which produces the electric power load pattern 300 The flowchart which shows the flow of the process which produces the operation plan table 400 of the next day. (A) The figure which shows the example of the operation plan table 400A created automatically (b) The figure which shows the example of the operation plan table 400B after an operator change Flow chart showing an example of processing of the number control device Flow chart showing another example of processing of the number control device Comparison chart of the number of units operated by “optimal control” and “normal control” Comparison of power generation efficiency between "optimal control" and "normal control" Diagram explaining the outline of operation number control based on hysteresis Diagram showing the relationship between load factor and power generation efficiency A figure showing an example where power generation efficiency deteriorates Diagram showing an example of improved power generation efficiency

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an outline of an energy supply system 1 according to an embodiment of the present invention. The energy supply system 1 includes an energy center 2 and a factory 3 (3-1, 3-2,..., 3-M) that receives supply of electric power and heat from the energy center 2.

  The energy center 2 generates electric power and heat, supplies the factory 3 with a cogeneration system 40 (hereinafter also referred to as “CGS40”), and an electric power load pattern 300 based on past electric load data of each factory 3 (see FIG. 5). ) And the information terminal 10 that creates the CGS 40 operation plan table 400 (see FIG. 7) based on the power load pattern 300 and the power based on the operation plan table 400 (or the power load pattern 300). A number control device 30 for controlling the number of operating CGS 40 while predicting the load fluctuation trend, and a process controller 20 for mediating transmission / reception of power load data transmitted from each factory 3 and data in the energy center 2. .

  The CGS 40 is a supply device that converts primary energy into electric power and heat for supply. The CGS 40 includes, for example, a gas engine that supplies electric power using gas as primary energy, an exhaust heat recovery boiler that recovers exhaust heat and supplies steam (heat), and the like. A plurality of CGSs 40 are installed as shown in the figure, and the number of operating units is controlled by the number control device 30.

  The power output side of each CGS 40 is connected to a power system (not shown). The heat output side of each CGS 40 is connected to a heat system (not shown). Thereby, each CGS 40 supplies electric power and heat to each factory 3.

  Each factory 3 (3-1, 3-2, ..., 3-M) receives supply of electric power and heat from the energy center 2 (CGS 40) via the electric power system and the thermal system. Each factory 3 includes arbitrary consumption equipment that consumes energy supplied from the energy center 2.

  Moreover, remote I / O50 (50-1, 50-2, ..., 50-M) is installed in the distribution board of each factory 3 (3-1, 3-2, ..., 3-M), and communication is carried out. The power load data of each factory 3 is transmitted to the process controller 20 of the energy center 2 via the network 5.

  The process controller 20 receives power load data of each factory 3 (3-1, 3-2,..., 3-M) from a remote I / O 50 installed in each factory 3. The received power load data is stored in the storage area of the process controller 20 and transferred to the information terminal 10 and the number control device 30.

  FIG. 2 shows an example of the hardware configuration of the information terminal 10 and the number control device 30 installed in the energy center 2. As shown in the figure, the information terminal 10 and the number control device 30 include a control unit 11, a storage unit 12, a media input / output unit 13, a communication control unit 14, an input unit 15, a display unit 16, and a peripheral device I / F unit 17. Are connected via the bus 18.

The control unit 11 is a CPU (Central Processing)
Unit), ROM (Read Only Memory), RAM (Random Access Memory) and the like. The CPU calls and executes a program stored in the storage unit 12, ROM, recording medium, or the like into a work memory area on the RAM, and executes processes (described later) performed by the information terminal 10 and the number control device 30. 8 and 9) are realized.

  The storage unit 12 is, for example, an HDD (Hard Disk Drive), and stores a program executed by the control unit, data necessary for program execution, an OS (Operating System), and the like. Each of these program codes is read by the control unit 11 as necessary, transferred to the RAM, and read and executed by the CPU.

  The storage unit 12 stores power load data of each factory 3 transferred from the process controller 20. With this data, the information terminal 10 and the number control device 30 can grasp the power load status of each factory 3.

  The media input / output unit 13 (drive device) inputs / outputs data, for example, media such as a CD drive (-ROM, -R, -RW, etc.), DVD drive (-ROM, -R, -RW, etc.) Has input / output devices. The communication control unit 14 includes a communication control device, a communication port, and the like, and is a communication interface that mediates communication between a computer and a network, and performs communication control between other computers via the network. The network may be wired or wireless.

The input unit 15 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad. An operation instruction, an operation instruction, data input, and the like can be performed on the information terminal 10 and the number control device 30 via the input unit 15.
The display unit 16 includes a liquid crystal panel, a display device such as an organic EL, and a logic circuit (a video adapter or the like) for realizing a video function of a computer in cooperation with the display device. The input unit 15 and the display unit 16 may be integrated like a touch panel display.

The peripheral device I / F (interface) unit 17 is a port for connecting a peripheral device, and transmits / receives data to / from the peripheral device via the peripheral device I / F unit 17. The bus 18 is a path that mediates transmission / reception of control signals, data signals, and the like between the devices.
In the present embodiment, the information terminal 10 and the number control device 30 are connected to the process controller 20 via the peripheral device I / F unit 17.
The number control device 30 is connected to each CGS 40 (40-1, 40-2,..., 40-M) via the peripheral device I / F unit 17 and the cable 7. The number control device 30 controls the number of operating CGS 40 by sending a start command, a stop command, etc. to each CGS 40 via the peripheral device I / F unit 17.

  FIG. 3 is a diagram showing the contents of the start / stop condition 100 that holds the hysteresis start setting value and the stop setting value. The start / stop condition 100 is preset in the number control device 30 as a control parameter for the number control. FIG. 3A shows a start / stop condition 100 (normal start / stop condition 100A) referred to by the number control device 30 when the power load is not decreasing (during normal operation). FIG. 3B shows a start / stop condition 100 (energy-saving start / stop condition 100B) referred to by the number control device 30 when the power load tends to decrease (during energy-saving operation). As described later, the energy saving start / stop condition 100B changes the stop condition of the normal start / stop condition 100A so that the number of operating CGSs 40 is likely to decrease (that is, the active CGS 40 is easy to stop). It is a thing.

  The start / stop condition 100 (100A, 100B) includes an activation set value (upper limit value of hysteresis) that is a power load threshold for increasing the number of operating CGS 40, and an electric load for decreasing the number of operating CGS 40. A stop set value (lower limit value of hysteresis), which is a threshold, is set. Thereby, the number control device 30 appropriately controls the number according to the fluctuation of the power load.

For example, in the start / stop condition for the number of operating units “1 unit × 2 units” in FIG. 3A, the start setting value 101A “H ₁ (kW)” (in order to increase the operating unit number of the CGS 40 from 1 to 2) The upper limit value of hysteresis) and the stop set value 102A “L ₁ (kW)” (lower limit value of hysteresis) for reducing the number of operating CGS units from two to one are set. As a result, the number control device 30 increases the power load during operation of one CGS 40 and exceeds the start setting value H ₁ (kW) (the power load satisfies the start condition “power load> start setting value H ₁ ”. If it is satisfied, the number control is performed so as to increase the number of operating CGS 40 from one to two. Further, when the power load decreases during operation of the two CGS 40 and falls below the stop set value L ₁ (kW) (when the power load satisfies the stop condition “power load <stop set value L ₁ ”), the operation of the CGS 40 is performed. The number control is performed so that the number is reduced from two to one.

In addition, in the start / stop condition of the operation number “2 units × 3 units” in FIG. 3A, the start setting value 101A “H ₂ (kW)” for further increasing the operation number from 2 units to 3 units ( The upper limit value of hysteresis) and the stop set value 102A “L ₂ (kW)” (lower limit value of hysteresis) for reducing the number of operating units from three to two are set. As a result, the number control device 30 increases the power load during operation of the two CGSs 40 and exceeds the start set value H ₂ (kW) (the power load satisfies the start condition “power load> start set value H ₂ ”. If it is satisfied, the number of CGS 40 is controlled so as to increase from two to three. Further, when the power load decreases during operation of the three CGSs 40 and falls below the stop set value L ₂ (kW) (when the power load satisfies the stop condition “power load <stop set value L ₂ ”), the CGS 40 is operated. The number control is performed so that the number is reduced from three to two.

  As described above, the energy-saving start / stop condition 100B is obtained by changing the stop condition of the normal-time start / stop condition 100A so that the number of operating CGSs 40 is likely to decrease. Specifically, the hysteresis stop set value in the energy saving start / stop condition 100B is increased by a predetermined value from the hysteresis stop set value in the normal start / stop condition 100A (the hysteresis width is narrowed).

For example, referring to FIG. 3B, the stop setting value 102B (“L ₁ ”) of the energy saving start / stop condition 100B for the number of operating units “2 to 3” is the stop setting of the normal start / stop condition 100A. The value 102A (“L ₁ ”) is increased by a predetermined value, and satisfies the relationship “L ₁ ′> L ₁ ” as shown in FIG. As a result, when the power load tends to decrease (during energy-saving operation), the power load falls below the hysteresis stop set value earlier than during normal operation, so the CGS 40 that operates excessively is stopped earlier. Therefore, the remaining CGS 40 can be operated with high efficiency.

  Next, the process in which the information terminal 10 creates the power load pattern 300 will be described with reference to the flowchart of FIG. The power load pattern 300 is a pattern of the transition of the power load for one day based on the past (for example, the previous year) actual load of the factory 3.

  In the present embodiment, it is assumed that the power load data of the previous year of each factory 3 is stored in the storage unit 12 of the information terminal 10. Any means may be used for the information terminal 10 to acquire and store the power load data of the factory 3. For example, the power load data of each factory 3 periodically transmitted from the remote I / O 50 is manually or automatically stored in the information terminal 10. Or a storage medium (USB or the like) that stores the power load data of the previous year from each factory 3 and stored in the storage unit 12 of the information terminal 10 via the storage medium. .

  First, the information terminal 10 classifies one year (365 days) by season (summer / winter / intermediate), day of the week (weekdays / weekends / holidays), special day (bon period / year-end / new year, etc.) Based on the power load data of the previous year of 3, the transition of the power load of the day for each classification is patterned for each factory (step S1). This is a factory-specific power load pattern 200. Then, the information terminal 10 adds up the patterned power load patterns by factory 200 to create a power load pattern 300 (step S2).

FIG. 5 is a diagram schematically illustrating a process for creating a power load pattern 300 of a certain classification. As shown in the figure, the power load pattern 200 (200-1, 200-2,..., 200-M) for each factory (factory 1, factory 2,. Create
As shown in FIG. 5, in this embodiment, the transition of the power load is patterned in units of one hour, but the time unit for patterning can be arbitrarily set such as 15 minutes, 30 minutes,. .

  Next, a process in which the information terminal 10 creates the operation plan table 400 for the next day based on the power load pattern 300 will be described with reference to the flowchart of FIG. Which power load pattern 300 is used is appropriately determined according to the classification of the next day. For example, if the classification of the next day is “summer / weekdays”, the power load pattern 300 associated with the classification “summer / weekdays” is used.

  First, the information terminal 10 initializes the time zone n for setting the operation mode to n = 1 (step S11). In the present embodiment, the time zone n = 1 is “AM0: 0 to AM1: 0”, the time zone n = 2 is “AM1: 0 to AM2: 00”,..., And the time zone n = 24 is “PM11: 00. -PM 12:00 ".

  Subsequently, it is determined whether or not the operation modes for all the time zones (n = 1 to 24) are set (step S12). If the operation modes for all the time zones are set (in step S12, “ Yes "), the process proceeds to step S16.

  When the operation mode for all the time zones is not set (when the time zone n is n ≦ 24) (“No” in step S12), the information terminal 10 sets the operation mode for the time zone n as follows. Set as follows.

First, based on the power load pattern 300, the information terminal 10 determines whether or not the power load for the next two hours will increase based on the start time of the time zone n (step S13). Specifically, if the power load in time zone n is P _n and the power load in the next time zone n + 1 is P _{n + 1} , it is determined whether or not the relationship of P _n ≧ P _{n + 1} is satisfied. In the present embodiment, the time zone to be determined is “over 2 hours”, but this time zone can be arbitrarily changed.

As a result, when the power load does not increase over the next two hours (that is, when the relationship of P _n ≧ P _{n + 1} is satisfied) (“Yes” in step S13), the information terminal 10 changes the time zone n to “load reduction time zone”. The operation mode for the time zone n in the operation plan table 400 is set to “energy saving mode” (step S14).

On the other hand, when the relationship of P _n ≧ P _{n + 1} is not satisfied (“No” in step S13), the information terminal 10 sets the operation mode of the time zone n in the operation plan table 400 to “normal mode” (step S15). .

  Subsequently, the information terminal 10 increments the time zone n for setting the operation mode (n = n + 1, step S16), and returns to step S12. The process of step S12-step S16 is repeated until the operation mode of all the time zones is set.

  When the operation mode for all the time periods is set (“Yes” in step S12), the information terminal 10 accepts the operator's input operation and manually changes the operation mode of the operation plan table 400 as appropriate (step S17), the operation plan table 400 is stored in the storage unit 12, and the process is terminated.

  Fig.7 (a) shows the example of the driving | operation plan table 400A (400) which the information terminal 10 created automatically by the process of step S11-S16. In the operation plan table 400A (400), the operation mode (“normal mode” or “energy saving mode”) of the CGS 40 is automatically set for each time zone.

  FIG. 7B shows an example of the operation plan table 400B (400) in which the operator manually changes the operation mode of the operation plan table 400A automatically created in step S17. In the example of the figure, the operator manually changes the operation mode in the time zone “1” (AM0: 0 to AM1: 0) from the “normal mode” to the “energy saving mode”, and the time zone “15” (PM3: 00) -PM at 4:00) is manually changed from "energy saving mode" to "normal mode", and the operation mode at "24" (PM11: 0 to PM12: 00) is changed from "normal mode" to "energy saving mode" It has been changed manually. Thus, the operator can correct the automatically created operation plan as appropriate.

  The created operation plan table 400 (400A or 400B) is sent to the number control device 30 via the process controller 20 and stored in the storage unit 12 of the number control device 30. As will be described later, the number control device 30 controls the number of operating CGS 40 while predicting the fluctuation tendency of the power load based on the operation plan table 400.

  Next, an example of processing executed by the number control device 30 will be described with reference to the flowchart of FIG. The flowchart in the figure shows a flow in which the number control device 30 performs the number control of the CGS 40 on a certain day. The time at the start of this process is AM00: 00.

First, the number control device 30 initializes the future time zone n for predicting the fluctuation tendency of the power load to n = 1 (AM0: 0 to AM10: 00) (step S21).
Subsequently, it is determined whether or not the operation for one day (all time zones) has ended (n> 24, step S22). When the operation for one day has ended (“Yes” in step S22), This process ends.

  When the operation of the day has not ended (when the time zone n is n ≦ 24) (“No” in step S22), the unit control device 30 tends to change the power load in the future time zone n. Is predicted (step S23). Specifically, with reference to the operation plan table 400, if the operation mode of the time zone n is “energy saving mode” (load reduction time zone), the fluctuation tendency of the power load is predicted as “load reduction tendency”. On the other hand, if the operation mode in the time zone n is “normal mode”, it is predicted that “the load is not decreasing”.

  When it is predicted that the time zone n is “not in a load decreasing tendency” (“No” in step S24), the number control device 30 determines the number of units based on the normal start / stop condition 100A (FIG. 3A). Control is executed (normal mode operation, step S26).

  On the other hand, when the time zone n is predicted to be “load decreasing tendency” (“Yes” in step S24), the unit control device 30 changes the stop condition so that the number of operating units of the CGS 40 is likely to decrease. The number control is executed based on the hour start / stop condition 100B (FIG. 3B) (energy saving mode operation, step S25). As a result, the hysteresis stop set value becomes larger than the stop set value during normal operation, so the power load will fall below the hysteresis stop set value earlier than during normal operation, causing excessive operation. The CGS 40 that is present can be stopped early.

  After step S25 or step S26, the unit control device 30 acquires the current time until the current time becomes the next time zone of the operation plan table 400 (“Yes” in step S27 or “Yes” in step S28). ), The number control is executed under the start / stop condition 100 (100A or 100B) in step S25 or step S26. When the current time becomes the next time zone, the time zone n is incremented (n = n + 1, step S29), and the process returns to step S22. The process of steps S22 to S29 is repeated until the day's operation is completed.

  As described above, according to the processing of FIG. 8, the unit control device 30 predicts the fluctuation tendency of the power load, and when the power load tends to decrease, the hysteresis stop set value is increased and the stop condition of the CGS 40 is set. change. As a result, the power load falls below the hysteresis stop set value at an early stage as compared with the normal operation, so that the excessively operating CGS 40 can be stopped early, and the operation of the CGS 40 with high power generation efficiency and energy saving performance can be performed. Realized.

In the present embodiment, the operation plan table 400 is created based on the power load pattern 300, but the creation of the operation plan table 400 is not essential. In this case, the number control device 30 executes the number control based on the power load pattern 300. Specifically, the process of FIG. 8 changes as follows. That is, in step S23 in FIG. 8, number control unit 30 refers to the power load pattern 300, based on the power load _{P n + 1} power load _{P n} and the next time slot n + 1 time zone n, the next two hours Predict trends in power load fluctuations. Specifically, in the case of P _n ≧ P _{n + 1} , it is predicted that “load decreasing tendency”. On the other hand, when P _n <P _{n + 1} , it is predicted that “the load is not decreasing”.

  When it is predicted that the time zone n is “not in a load decreasing tendency” (“No” in step S24), the number control device 30 is based on the normal start / stop condition 100A (FIG. 3A). The number control is executed (step S26). On the other hand, when the time zone n is predicted to be “load decreasing tendency” (“Yes” in step S24), the unit control device 30 changes the stop condition so that the number of operating units of the CGS 40 is likely to decrease. The number control is executed based on the hour start / stop condition 100B (FIG. 3B) (step S25).

After step S25 or step S26, the number control device 30 acquires the current time until the current time becomes the next time zone of the power load pattern 300 (“Yes” in step S27 or “Yes” in step S28). ), The number control is executed under the start / stop condition 100 (100A or 100B) in step S25 or step S27. When the current time becomes the next time zone, the time zone n is incremented (n = n + 1, step S29), and the process returns to step S22. The process of steps S22 to S29 is repeated until the day's operation is completed.
As described above, the number control device 30 may perform the number control while directly referring to the power load pattern 300.

  Next, another example of processing executed by the number control device 30 will be described with reference to the flowchart of FIG. The processing of FIG. 9 is performed after the step S25 and the step S26 of FIG. 8 when the power load variation tendency predicted from the operation plan table 400 (or the power load pattern 300) is different from the actual load variation tendency. Is added to the process of forcibly switching (the process of step S31 and step S32).

  Specifically, a “load decreasing tendency” is predicted based on the operation plan table 400 (or the power load pattern 300) (“Yes” in step S24), and the stop condition is set so that the number of operating units of the CGS 40 is likely to decrease. In the case where the unit load control is executed based on the changed energy-saving start / stop condition 100B (step S25), but the fluctuation tendency of the actual load of the factory 3 is increasing (“Yes” in step S31). In step S26, the operation mode is forcibly switched from the “energy saving mode” to the “normal mode”. That is, the number control device 30 forcibly cancels the change of the stop condition and continues the number control based on the normal start / stop condition 100A.

  Further, it is predicted based on the operation plan table 400 (or the power load pattern 300) that “it does not tend to decrease in load” (“No” in step S24), and the number control is executed based on the normal start / stop condition 100A. Nevertheless, if the actual load fluctuation tendency of the factory 3 is decreasing (“Yes” in step S32), the process proceeds to step S25, and the operation mode is changed from “normal mode” to “energy saving”. Forcibly switch to mode. That is, the number control device 30 forcibly changes the stop condition so that the number of operating CGSs 40 is likely to decrease, and continues the number control based on the energy saving start / stop condition 100B.

  During the processing in FIG. 9, the unit control device 30 stores the actual load data of the entire factory (load data obtained by adding the power load data of each factory 3 transmitted from each remote I / O 50 of each factory 3) for a predetermined time. By acquiring this data every other time and analyzing the actual load data in time series, it is possible to determine the actual load fluctuation tendency (increase tendency, decrease tendency, etc.) in step S31 and step S32.

As described above, according to the processing of FIG. 9, flexible number control in consideration of the fluctuation tendency of the actual load of the factory 3 is realized.
In the example of FIG. 9, when the predicted fluctuation tendency of the power load and the fluctuation tendency of the actual load of the factory 3 are different (“Yes” in step S31 or “Yes” in step S32), the operation mode is forcibly changed. Although switching is performed, switching of the operation mode may be left to the operator's judgment. In this case, the number control device 30 notifies only that the predicted tendency based on the operation plan table 400 (or the power load pattern 300) is different from the tendency of the actual load with display information or voice information.

<Example>
FIGS. 10 and 11 show comparison results in which the number control (hereinafter referred to as “optimum control”) and the normal number control (hereinafter referred to as “normal control”) of the present invention are applied based on the actual operation data. The normal control is a unit control based only on the normal start / stop condition 100A (FIG. 3A).

  FIG. 9 is a time series comparison of the number of CGS operated by “optimal control” and “normal control”. As shown in the figure, when “optimal control” is applied, the number of operating CGS units decreases around “AM2: 0 to AM4: 00” and “PM6: 0 to PM10: 00” when the power load tends to decrease. On the other hand, when “normal control” is applied, the number of units operating in the same time zone does not decrease.

  FIG. 10 is a graph comparing the power generation efficiencies of “optimal control” and “normal control”. As shown in the figure, it is understood that when “optimal control” is applied, the power generation efficiency is improved as compared with “normal control” in the time zone in which the number of operating units decreases in FIG. 9. Specifically, the power generation efficiency was improved by "1.87%" per day and "0.47%" per day on average.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples.
For example, in this embodiment, the CGS start condition is defined as “the power load exceeds the hysteresis start set value”, and the CGS stop condition is defined as “the power load falls below the hysteresis stop set value”. When the power load tends to decrease, the stop condition is changed so that the number of operating CGS is easily decreased by increasing the hysteresis stop set value. However, the CGS start / stop condition and the means for changing the stop condition so that the number of operating CGS can be easily reduced are not limited to this example.

  For example, the CGS start condition is “the power load exceeds the hysteresis start set value for 60 seconds continuously”, and the CGS stop condition is “the power load is below the hysteresis stop set value for 60 seconds”. A start / stop condition can also be defined by adding a duration condition. In this case, for example, it is possible to change the stop condition so that the number of operating CGS can be easily reduced by relaxing the condition of the duration such as “the power load is continuously lower than the hysteresis stop set value for 30 seconds”. it can.

  In addition, it is obvious that those skilled in the art can arrive at various changes or modifications within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. It is understood.

1 …………… Energy Supply System 2 …………… Energy Center 3 ……………… Factory 5 …………… Communication Network 10 ………… Information Terminal 20 ………… Process Controller 30 ………… ... Number control device 40 ………… Cogeneration system 50 ………… Remote I / O
100 ......... Start / Stop Condition 100A ... Normal Start / Stop Condition 100B ... Energy-saving Start / Stop Condition 200 ......... Power Load Pattern 300 by Factory ...... Power Load Pattern 400 ......... Operation Plan Table

Claims (8)

A number control device for controlling the number of operating a plurality of supply devices for supplying power to one or more supply destinations;
A unit control unit that increases the number of operating units based on a predetermined start condition and decreases the number of operating units based on a predetermined stop condition;
A prediction unit for predicting the trend of the power load ahead of the supply destination;
When it is predicted that the power load will not increase, a condition changing unit that changes the stop condition so that the number of operating units is likely to decrease; and
A device for controlling the number of units. The prediction unit predicts a trend of power load in a predetermined time zone,
2. The number control device according to claim 1, wherein the condition change unit changes the stop condition in the predetermined time zone when it is predicted that the power load does not increase in the predetermined time zone. A storage unit for storing a power load pattern created based on past power load data of the supply destination,
The number control device according to claim 1, wherein the prediction unit predicts a tendency of an electric power load based on the electric power load pattern. An actual load acquisition unit for acquiring an actual load of the supply destination;
In the state where the stop condition is changed by the condition changing unit, when the actual load tends to increase, a forced condition change canceling unit for canceling the change of the stop condition,
The number control device according to claim 3, further comprising: An actual load acquisition unit for acquiring an actual load of the supply destination;
In a state where the stop condition is not changed by the condition change unit, when the actual load tends to decrease, a forced condition change unit that changes the stop condition;
The number control device according to claim 3, further comprising: The number control unit increases the number of operating units when the power load value exceeds a predetermined start setting value, and decreases the number of operating units when the power load value falls below a predetermined stop setting value,
The said condition change part changes the said stop condition by raising the said stop setting value, The number control apparatus in any one of Claims 1-5 characterized by the above-mentioned. A number control method of a number control device for controlling the number of operating a plurality of supply devices for supplying power to one or more supply destinations,
A unit control step for increasing the number of operating units based on a predetermined start condition and decreasing the number of operating units based on a predetermined stop condition;
A prediction step of predicting a future power load trend of the supply destination;
When it is predicted that the power load will not increase, a condition changing step for changing the stop condition so that the number of operating units is likely to decrease; and
A method for controlling the number of units. A program of a unit control device for controlling the number of operating a plurality of supply devices for supplying power to one or more supply destinations,
The number control device,
A unit control unit that increases the number of operating units based on a predetermined start condition and decreases the number of operating units based on a predetermined stop condition;
A prediction unit for predicting the trend of the power load ahead of the supply destination;
When it is predicted that the power load will not increase, a condition changing unit that changes the stop condition so that the number of operating units is likely to decrease; and
A program characterized by making it function.

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