Work planning device and work planning method

Abstract

This invention reduces the total downtime of equipment operations. [Solution] The work planning device of the present invention is characterized by comprising: an advance candidate task selection unit that selects unplanned tasks required for recovery from equipment downtime as recovery tasks, selected planned tasks requiring equipment downtime that can be performed together with the recovery tasks as advance candidate tasks, and selects a combination of the selected recovery tasks and the selected advance candidate tasks as a composite task; and a work planning unit that determines the timing of the implementation of a plurality of tasks including the composite task.

Description

Technical Field

[0001] The present invention relates to a work plan creation device and a work plan creation method.

Background Art

[0002] In recent years, for the purpose of managing outdoor activities of enterprises, the introduction of FSM (Field Service Management) has been promoted in various industries. FSM includes support for task generation, work plan creation, progress management of actual on-site work, and the like. In particular, in work plan creation, not only manual operations via a user interface but also those using calculations such as machine learning have been developed, and further sophistication is required. Work plan creation usually handles tasks one by one individually and assigns them in chronological order.

[0003] As background art in this technical field, there is a power outage plan creation system described in Patent Document 1. In the abstract of Patent Document 1, it is described that "a power outage plan creation system capable of accurately calculating working hours and appropriately selecting a power outage schedule is provided."

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, depending on the operator, there are needs to group a plurality of tasks in the form of subsequent work and assign them to the same time slot to reduce operation stop time, improve task execution rate, reduce travel time, reduce opportunity loss, and the like. Patent Document 1 can plan power outages and work that are easily acceptable to power users, but it is difficult to reduce the operation stop time of facilities (power outage time in Patent Document 1). Also, Patent Document 1 does not have the idea of subsequent work.

[0006] Therefore, the present invention aims to reduce the total downtime of equipment operations. [Means for solving the problem]

[0007] The work planning apparatus of the present invention is characterized by comprising: an advance candidate task selection unit that selects unplanned tasks required for recovery from equipment downtime as recovery tasks, selected planned tasks requiring equipment downtime that can be performed together with the recovery tasks as advance candidate tasks, and selects a combination of the selected recovery tasks and the selected advance candidate tasks as a composite task; and a work planning unit that determines the timing of the implementation of a plurality of tasks including the composite task. Other means will be described within the context of the embodiments of the invention. [Effects of the Invention]

[0008] According to the present invention, the total downtime of equipment operation can be reduced. [Brief explanation of the drawing]

[0009] [Figure 1A] This diagram shows the hardware configuration of the work planning device. [Figure 1B] This diagram shows the functions of the work planning system software. [Figure 2] This figure shows an example of a task list. [Figure 3] This flowchart shows the processing of the task selection unit for tasks that can be brought forward. [Figure 4] This figure shows an example of a task list with identification information for tasks that are likely to be brought forward. [Figure 5] This is a flowchart showing the processing steps of the work planning department. [Figure 6] This is a flowchart showing the processing of the screen output section. [Figure 7] This figure shows an example of a screen output by the screen output unit. [Modes for carrying out the invention]

[0010] Hereafter, embodiments of the present invention (referred to as "this embodiment") will be described in detail with reference to the drawings. The work planning device of this embodiment plans a work schedule by grouping multiple tasks together. This embodiment does not limit the content of the tasks to be performed or the fields in which it is used. The following description uses equipment maintenance work in power systems as an example solely for the sake of clarity.

[0011] (term) A task is a unit of work that is planned to be carried out in the future by resources, including people and material materials. The task in this embodiment relates to the maintenance of equipment owned by a power transmission and distribution operator. An unplanned task is one whose execution is accidental. For example, a task performed immediately after a disaster or accident is an unplanned task. Even if the cause is not accidental, a task whose urgency for recovery is greater than a predetermined standard may be treated as an unplanned task.

[0012] A task within the plan is one whose cause is planned. For example, the annual statutory inspection is a task within the plan. Even if the cause is not planned, a task whose urgency to resolve is low compared to a predetermined standard may be treated as a task within the plan. Both unplanned and planned tasks are similar in that they are planned for the future (listed in the task list below). However, they are distinguished from unplanned tasks based on their cause or urgency. In this context, an unplanned power outage is a power outage caused by an unplanned task, while a planned power outage is a power outage caused by a planned task.

[0013] Recovery means returning the equipment from a non-operational state to an operational state. The non-operational state in this embodiment is typically a power outage. The non-operational state (power outage) is mainly required from the perspective of safety associated with the execution of tasks. Of course, due to disasters or accidents, the equipment may inevitably enter a non-operational state, and tasks may be carried out as they are.

[0014] A recovery task is an unplanned task among the tasks related to the equipment that requires recovery, and it is intended to change the execution time. A task that can be carried out together with a recovery task is a task that can be carried out in advance. In principle, a task that can be carried out in advance is a task within the plan, but it may also be an unplanned task (details will be described later). Note that one of the recovery task and the task that can be carried out in advance becomes the "subsequent work" of the other. "Subsequent work" means another work that is carried out in conjunction with a certain work. A combined task is a combination of a recovery task and a task that can be carried out in advance. For example, when the execution area of the recovery task coincides with the execution area of the task that can be carried out in advance, these tasks often belong to the same power system. Therefore, it is often the case that the overall power outage time is shortened by carrying out the two tasks while powering off the power system at once. This is also the reason why the work plan formulation device of this embodiment selects the combined task.

[0015] Focusing on the execution times of the recovery task and the task that can be carried out in advance that constitute the combined task, it is not necessary for the execution time of the recovery task to completely coincide with the execution time of the task that can be carried out in advance. The task that can be carried out in advance may be started after the recovery task is completed, or the recovery task may be started after the task that can be carried out in advance is completed. A part of the execution time of the recovery task may overlap with a part of the execution time of the task that can be carried out in advance. In any case, recovery (restoration of power) is not carried out after the first task is completed, but after the last task is completed. "Can be carried out together" means such things.

[0016] Pre-advancement means that the execution time of a task is advanced. In many cases, a recovery task is combined with a pre-advancement task whose planned execution time is later than itself. However, although the semantics are somewhat contradictory, it is also possible for a recovery task to be combined with a pre-advancement task whose planned execution time is earlier than itself.

[0017] FIG. 1A is a diagram showing the hardware configuration of the work plan creation device 6. The work plan creation device 6 is a general computer. The work plan creation device 6 includes a CPU (Central Processing Unit) 61, a storage unit 62, a communication I / F (Interface) 63, an input / output I / F 64, and a DSP (Digital Signal Processor) 65. Here, the storage unit 62 includes a RAM (Random Access Memory) 62a, a ROM (Read Only Memory) 62b, and a HDD (Hard Disc Drive) 62c. The communication I / F (Interface) 63 is connected to a communication circuit 66. The input / output I / F 64 is connected to an input / output device 67 (for example, a display device 5 and an input device 7). In the ROM 62b, programs executed by the CPU 61 and the DSP 65, various data, etc. are stored. The CPU 61 and the DSP 65 realize various functions by executing these programs. Here, the HDD 62c corresponds to a non-volatile large-capacity storage DB (Data Base). Note that this embodiment is not limited to a single device, and may be implemented as a work plan system in which a plurality of servers, etc. cooperate.

[0018] FIG. 1B is a diagram showing the functions of the software of the work plan creation device 6. The pre-advancement candidate task selection unit 2, the work plan creation unit 3, and the screen output unit 4 are the above-described programs and are stored in a non-volatile large-capacity storage DB (for example, the ROM 62b).

[0019] The pre-advancement candidate task selection unit 2 selects a recovery task from the tasks scheduled for execution, and selects a pre-advancement candidate task that can be executed together with the recovery task. The work planning unit 3 uses a mathematical optimization model to determine the implementation plan for multiple tasks, including a synthesis task. More specifically, the screen output unit 4 displays at least one of the following on the display device 5 in response to user instructions: a task to be brought forward, a task to be recovered, a task to be brought forward that is actually brought forward, and a task to be brought forward that is not actually brought forward.

[0020] The non-volatile large-capacity storage database (e.g., ROM62b) also stores the task list D1. The display device 5 in Figure 1B is the same display device 5 in Figure 1A and is hardware.

[0021] Figure 2 shows an example of task list D1. Task list D1 is stored in a large-capacity storage DB (e.g., ROM62b). In task list D1, the task details are stored in the task details field D12, the estimated work time in the estimated work time field D13, the work period in the work period field D14, the deadline in the deadline field D15, the power outage necessity information in the power outage necessity information field D16, the unplanned flag in the unplanned flag field D17, and the implementation area identification number in the implementation area identification number field D18.

[0022] The task identification number in the task identification number field D11 is a number that uniquely identifies the task. The task details in the task details column D12 are the details of the task. The estimated work time in column D13 is an estimate of the time required to complete the task. The "Workable Period" column D14 refers to the start date (year, month, day, or a combination of year, month, day, and time) and end date (same as above) of the period during which the task can be performed. There may be multiple workable periods for the same task. The aforementioned "implementation period" is the portion of the workable period during which the task is actually performed, and its length is equal to the estimated work time. The deadline in column D15 is the deadline for completing the task.

[0023] The power outage necessity information in section D16 indicates whether a power outage (or, in cases outside the power grid sector, the shutdown of any equipment) is necessary to carry out the task. For example, if there is a risk of electric shock to field workers when the task is carried out under power conditions and a power outage is necessary, the power outage necessity information is "1". If there is no particular danger and a power outage is unnecessary, the power outage necessity information is "0". If a power outage is necessary, then restoration from the power outage (shutdown) will also be necessary. Note that "Information 1" corresponds to the power outage necessity information here. The "Unplanned" flag in column D17 indicates whether or not the task is unplanned. For example, a "1" is stored as the unplanned flag for unplanned tasks caused by sudden disasters, accidents, etc. A "0" is stored as the unplanned flag for planned tasks whose execution is due to a planned cause. Note that "Second Information" corresponds to the unplanned flag here.

[0024] The implementation area identification number in the implementation area identification number field D18 is the identification number of the implementation area where the task will be performed. For example, tasks with the same implementation area identification number belong to the same implementation area.

[0025] Task list D1 may store information such as the following as "fields" (not shown in Figure 2). The same applies to task list D1B (Figure 4). • Information about facilities This includes the type of equipment targeted by the task, the manufacturer's name, etc. • Information regarding facility boundaries This includes information that uniquely identifies switches located at both ends of a power transmission line, information that uniquely identifies valves located at both ends of a pipeline, and so on.

[0026] The "third piece of information" is at least one of the following: the implementation area identification number, information about the equipment, and information about the boundaries of the equipment.

[0027] The work planning device 6 acquires the latest information at regular intervals, for example by polling, and reflects it in the task list D1. The work planning device 6 may also update the information in the task list D1 whenever it detects the occurrence of a trigger event. The work planning device 6 may also accept updates from the user as needed. The work planning device 6 may update the task list D1 by combining several of the above-described means.

[0028] In any case, the work planning device 6 constantly maintains the task list D1 in an up-to-date state. This embodiment assumes that all tasks to be performed are included in the task list D1 and that the information for each task is up-to-date.

[0029] Figure 3 is a flowchart showing the processing S20 of the task selection unit 2 for tasks to be brought forward. In step S21, the task selection unit 2 selects from the task list D1 tasks that satisfy all of the following conditions 1 and 2 as "recovery tasks". <Condition 1> The power outage necessity information (field D16) is "1". <Condition 2> The unplanned flag (column D17) is "1". This allows for the selection of tasks to restore power after an unplanned outage. Multiple restoration tasks may be assigned.

[0030] In step S22, the task selection unit 2 selects tasks from the task list D1 that satisfy all of the following conditions 11 to 13 as "tasks to be brought forward". <Condition 11> The power outage necessity information (field D16) is "1". <Condition 12> The unplanned flag (column D17) is "0". <Condition 13> The third piece of information matches the third piece of information in the recovery task.

[0031] The “third piece of information” in condition 13 is at least one of the following: the implementation area identification number, information about the equipment, and information about the equipment boundary. If the third condition is the implementation area identification number, tasks performed in a location close to where the recovery task is performed are selected as candidates for accelerated execution. If the third condition is information about the equipment, for example, tasks that target equipment from the same manufacturer as the equipment targeted by the recovery task are selected as candidates for accelerated execution. If the third condition is information about the equipment boundary, for example, tasks that target adjacent equipment (power transmission lines) connected to the equipment (power transmission lines) targeted by the recovery task via a certain switch are selected as candidates for accelerated execution.

[0032] When the third piece of information matches, the efficiency of the synthesis task increases, for example, the power outage time is shortened. The third piece of information may be the physical information described above, or it may be artificial information (such as the qualifications of the workers required by the task). Furthermore, condition 13 may also be a numerical condition, such as "the sum of the estimated work time of the recovery task and the estimated work time of the candidate task to be brought forward is within a predetermined threshold."

[0033] The task selection unit 2 for early deployment can also ignore condition 12. However, if the task selection unit 2 ignores condition 12, an unplanned task (a task resulting from a disaster or accident) may be selected, and as a result, a combination of two unplanned tasks may become a composite task. From the perspective of ensuring safe and reliable recovery, it may be desirable to avoid this.

[0034] In many cases, tasks that were scheduled to be carried out as planned tasks requiring a power outage and are related to the recovery task via third-party information are selected as candidates for accelerated tasks. If there are multiple recovery tasks, a candidate for accelerated task is selected for each recovery task. In this way, the accelerated task selection unit 2 selects one or more combined tasks as a combination of recovery tasks and accelerated task candidates.

[0035] In step S23, the task selection unit 2 outputs the results of the task selection in step S22. The flowchart then terminates. Figure 4 shows an example of the output of the selection results.

[0036] Figure 4 shows an example of task list D1B with task identification information for early selection added. The early selection task selection unit 2 outputs task list D1B, which is obtained by adding the early selection task identification information field D19 to task list D1 (Figure 2), as the early selection task for early selection. The early selection task identification information field D19 stores, for example, the task identification number of the corresponding recovery task. Nothing is stored in the early selection task identification information field D19 for tasks that were not selected as early selection tasks. In other words, tasks in records (rows) in which some kind of identification number is stored in the early selection task identification information field D19 become early selection tasks. It should be noted here that the terms "identification information" and "identification number" are used differently.

[0037] The method of assigning the task identification information for early task selection as described above is merely an example and can be flexibly changed depending on the business, operator, work planning method, etc. In this embodiment, the task identification information for early task selection is the task identification number of the corresponding recovery task, as shown in Figure 4. The task selection unit 2 outputs the task list D1B with the task identification information field D19 to the work planning unit 3 and the screen output unit 4, which will be described later.

[0038] Figure 5 is a flowchart showing the process S30 of the work planning unit 3. In step S31, the work planning unit 3 extracts all combinations (composite tasks) of accelerated candidate tasks with accelerated candidate task identification information (column D19) and their corresponding recovery tasks from the task list D1B. Then, the work planning unit 3 changes the deadline of an accelerated candidate task within a given composite task to the deadline of the recovery task within that composite task. Specifically, if an accelerated candidate task within a composite task is Task A and the recovery task within that composite task is Task B, the work planning unit 3 changes the deadline of Task A (column D15) to the same value as the deadline of Task B (column D15) (see symbol D20 in Figure 4). The work planning unit 3 performs this process for all accelerated candidate tasks that have accelerated candidate task identification information (column D19). As a result, each accelerated candidate task is treated as something that should be carried out urgently, just like its corresponding recovery task.

[0039] In step S32, the work planning unit 3 adds the workable period of the corresponding recovery task to the workable period of the accelerated task. Specifically, the work planning unit 3 adds the workable period of task B (column D14) to the workable period of task A (column D14) (see reference numeral D21 in Figure 4). The work planning unit 3 performs this process for all accelerated task candidates that have accelerated task candidate identification information (column D19). As a result, each accelerated task candidate is treated as being able to work for the same period as the corresponding recovery task.

[0040] In step S33, the work planning unit 3 inputs the input information values ​​from task list D1B into the variables of the mathematical optimization model. As described above, task list D1B contains information about the composite task. Therefore, the mathematical optimization model will have, for example, the following objective function and constraints.

[0041] A mathematical optimization model may have multiple objective functions, and these may be weighted according to their respective priorities. Similarly, the mathematical optimization model may have multiple constraints. Below, only examples of objective functions and constraints relevant to the present invention are shown.

[0042] If the objective function considers bringing tasks forward, the objective function is, for example, the sum of the penalties for each task if it is planned to be in violation of its deadline. The work planning unit 3 then minimizes this objective function. As a result, the tasks that are candidates for being brought forward are brought forward as much as possible by the deadline for the recovery task, i.e., the target time for the unplanned power outage to end.

[0043] Here, the task selection unit 2 for bringing forward tasks may accept that the user arbitrarily set the deadline for the recovery task. By intentionally setting the deadline to be postponed, the target time for unplanned power outages can be extended, and the number of task candidates for bringing forward that are actually brought forward can be increased. This makes it possible to further reduce the time of planned power outages that were scheduled to be carried out in conjunction with the task candidates for bringing forward, and to improve task execution efficiency by carrying out other tasks during the time slots that were scheduled to be carried out for the task candidates for bringing forward.

[0044] The constraints of the mathematical optimization model include, for example, the constraint that each task must be assigned within the available work period. The work planning unit 3 will then adhere to this constraint. In this case, for tasks with multiple available work periods, it is not necessary for the entire process of the task to be planned within a single available work period. Another possible constraint is that each task must be assigned to a slot with a duration equal to or greater than the estimated work time (column D13).

[0045] The work plan may link resources and tasks in a time series, in which case the objective function and constraints of the mathematical optimization model may include resource constraints.

[0046] In step S34, the work planning unit 3 performs mathematical optimization calculations based on the mathematical optimization model generated in step S33. That is, the work planning unit 3 determines the timing of multiple tasks, including the synthesis task. This makes it possible to create a work plan that brings the recovery task forward as much as possible.

[0047] In step S35, the work plan creation unit 3 outputs the work plan created in step S34 to the screen output unit 4. After that, the flowchart is terminated.

[0048] Figure 6 is a flowchart showing an example of processing S40 of the screen output unit 4. The screen output unit 4 is a functional unit that displays the content selected by the user on the display device 5, and its processing is explained in Figure 6. The display device 5 is configured with, for example, a liquid crystal panel, an organic EL (Electro Luminescence) panel, etc., and displays the content selected by the operator.

[0049] In step S41, the screen output unit 4 accepts input for selecting an item to display on the screen (details will be described later as an explanation of Figure 7). In step S42, the screen output unit 4 displays content corresponding to the selected item. After that, the flowchart is terminated.

[0050] Next, we will explain an example of the configuration of screen 51 in Figure 7. Figure 7 shows an example of a screen output by the screen output unit 4. The screen 51 displayed on the display device 5 is composed of multiple panes (display content selection pane 52, result output pane 53), which are small areas divided from the screen.

[0051] When the user selects an item to display in the display content selection pane 52, the other panes display content corresponding to the selected item. Selectable items include a task list D1B containing task identification information for early task candidates, a work plan, and the like. When these items are selected, step S41 in Figure 6 indicates that the selection input for the item to be displayed has been received. Subsequently, in step S42 in Figure 6, content corresponding to the selected item is displayed in the result output pane 53.

[0052] The results output pane 53 displays the task list D1B, which is the output of the task selection unit 2 for tasks to be brought forward, and the work plan, which is the output of the work plan formulation unit 3. The task list D1B includes task identification information for tasks to be brought forward. This makes it possible to determine which tasks have been selected as tasks to be brought forward. The work plan is displayed in a format such as a Gantt chart. This makes it possible to determine which tasks should be performed and when.

[0053] The work plan in Figure 7 involves performing Task 0001, then Task 0002, and also performing Task 0003 during the time period in which Task 0001 is being performed.

[0054] The screen output unit 4 may display task list D1B on screen 51 and then selectively highlight at least one of the following tasks according to user instructions. • Tasks that can be brought forward Tasks that were among the candidates for being brought forward and were actually brought forward Tasks that were candidates for being brought forward but were not actually brought forward • Recovery tasks

[0055] When conducting business using the work planning device 6 according to this embodiment, several forms are possible. For example, one form is possible in which a business operator using the work planning device 6 creates a work plan and operates that work plan. Alternatively, for example, one business operator may use the work planning device 6 to create a work plan and request other business operators to carry out the work based on the work plan.

[0056] Furthermore, for example, one business operator can use the work planning device 6 to select only the tasks that can be brought forward, and then request another business operator to create a work plan and carry out the work based on the task list D1B to which the task identification information for the task to be brought forward has been assigned. As in the last example, in this embodiment, by using the task identification information for the task to be brought forward as an interface, the functions of the task selection unit 2 or the work planning unit 3 can each be used independently. Therefore, it is possible to implement this in the form of microservices, such as by constructing the task selection unit 2 or the work planning unit 3 as separate devices, or by later extrapolating one of the functions to the same device.

[0057] (Effects of the embodiment) (1) The work planning device can combine recovery tasks and candidate tasks for prioritization, which all share the common requirement of shutting down the equipment to be worked on, into a composite task that can shorten the recovery time. (2) The work planning device can reliably select unplanned recovery tasks and planned tasks that can be brought forward based on the matching of the "third information" stored in the memory unit. (3) The work planning device can select a combined task that can reduce the downtime of the equipment compared to, for example, when the recovery task and the candidate task for being brought forward are carried out separately. (4) The work planning device can clarify the deadlines for synthesis tasks.

[0058] (5) The work planning device can clarify the available work period for the synthesis task. (6) The work planning device can determine the timing of the synthesis task using a mathematical optimization model. (7) The work planning device can ensure that tasks are carried out within the available work period. (8) The work planning device allows the user to arbitrarily input deadlines for recovery tasks and adjust the number of tasks that are candidates for being brought forward. (9) The work planning device allows the user to visually confirm the results of the work being completed ahead of schedule, etc.

[0059] The present invention is not limited to the embodiments described above, and includes various modifications. For example, the embodiments described above are described in detail to make the present invention easier to understand, and are not necessarily limited to those having all the configurations described. It is possible to replace parts of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add configurations from other embodiments to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace parts of the configuration of each embodiment with other configurations.

[0060] Each of the aforementioned configurations, functions, processing units, processing means, etc., may be implemented in part or in whole by hardware such as integrated circuits.

[0061] In each embodiment, the control lines and information lines shown are those deemed necessary for illustrative purposes, and not all control lines and information lines are necessarily shown in the actual product. In practice, it can be assumed that almost all components are interconnected. [Explanation of symbols]

[0062] 2. Task Selection Department for Tasks to be Accelerated 3. Work Planning Department 4. Screen output section 5 Display device 6. Work planning device 7 Input device 51 screens 52 Display Content Selection Pane 53 Result Output Pane D1 Task List D1B Task List (after adding identification information for tasks that could be brought forward)

Claims

1. Unplanned tasks required to restore equipment from downtime are selected as recovery tasks. Tasks within the plan that require the shutdown of equipment and that can be carried out together with the aforementioned recovery tasks are selected as candidates for accelerated tasks. A task selection unit selects a combination of the selected recovery task and the selected task to be brought forward as a composite task, A work planning unit that determines the timing of the execution of multiple tasks, including the aforementioned synthesis task, To be equipped, A work planning device characterized by the following.

2. The system includes a storage unit that stores, in association with a task, first information indicating whether the task requires the shutdown of the equipment, second information indicating whether the task is unplanned, and third information different from the first and second information. The aforementioned task selection unit for accelerated tasks, From the storage unit, a task is selected as the recovery task in which the first information indicates that the equipment must be shut down, and the second information indicates that it is unplanned. From the memory unit, a task is selected as a candidate task to be brought forward if the first information indicates that the equipment needs to be shut down, the second information indicates that it is within the planned timeframe, and the third information matches the third information of the recovery task. A work planning device according to claim 1, characterized by the following:

3. The third piece of information mentioned above is, It must be at least one of the following: information indicating the task execution area, information about the equipment, and information about the equipment boundaries. A work planning device according to claim 2, characterized by the following:

4. The aforementioned storage unit is The deadline is stored in relation to the aforementioned task. The aforementioned work planning department, The deadline for the candidate task to be brought forward among the aforementioned synthesis tasks is set as the deadline for the recovery task among the aforementioned synthesis tasks, and then the aforementioned synthesis tasks are input into the mathematical optimization model. A work planning device according to claim 2, characterized by the following:

5. The aforementioned storage unit is The available work period is stored in relation to the aforementioned task. The aforementioned work planning department, The process involves adding the working period of the recovery task among the synthesis tasks to the working period of the candidate task to be brought forward among the synthesis tasks, and then inputting the synthesis tasks into the mathematical optimization model. A work planning device according to claim 3, characterized by the following:

6. The aforementioned work planning department, The timing of the execution of multiple tasks, including the composite task, is determined by minimizing the sum of the penalties for each task being planned in violation of the deadline, as the objective function of a mathematical optimization model. A work planning device according to claim 2, characterized by the following:

7. The aforementioned work planning department, The constraint of the mathematical optimization model is that each task must be assigned within the available working period. A work planning device according to claim 6, characterized by the following:

8. The aforementioned task selection unit for accelerated tasks, The system allows users to arbitrarily set the deadline for the aforementioned recovery task. A work planning device according to claim 4, characterized by the following:

9. The system includes a screen output unit that, in response to user instructions, displays at least one of the following on a display device: the candidate task to be brought forward, the recovery task, the candidate task to be brought forward in practice, and the candidate task to be brought forward in practice. A work planning device according to claim 1, characterized by the following:

10. The task selection unit for bringing forward candidate tasks in the work planning device is: Unplanned tasks required to restore equipment from downtime are selected as recovery tasks. Tasks that require the shutdown of equipment and that can be performed together with the aforementioned recovery tasks are selected as candidates for accelerated tasks. The combination of the selected recovery task and the selected candidate task for early deployment is selected as a composite task. The work planning unit of the aforementioned work planning device is: To determine the timing for performing multiple tasks, including the aforementioned synthesis task. A work planning method characterized by the following.

Images