JP2018036679A - Plan creation device and plan creation method related to employment of energy demand facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an employment plan capable of properly suppressing utilization cost of a combined energy system.SOLUTION: A plan creation device 20 creates an employment plan and a maintenance plan in a combined energy system comprising plural appliances for supplying energy to a plant. An appliance service life acquisition part 21 of the plan creation device 20 acquires an appliance service life (initial service life) indicating a service life time of each appliance. An evaluation function generation part 22 considers the appliance service life (initial service life) for generating an evaluation function for evaluating employment cost and maintenance cost required for employing and maintaining the combined energy system. An employment plan generation part 23 generates an employment plan so that, a total sum of the employment cost and maintenance cost becomes small, while satisfying the energy demand on a plant, based on the evaluation function. A maintenance plan creation part 24 creates a maintenance plan according to the employment plan generated by the employment plan generation part 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a plan creation device and a plan creation method for creating a plan for operation in an energy demand facility.

  Patent Document 1 discloses a maintenance plan support system as this type of plan creation device. The maintenance plan support system of this patent document 1 is for a power plant, an air conditioner, and the like, and presents a maintenance time so that the maintenance cost per unit time is minimized for each device, thereby making a maintenance plan. It has become.

  Patent Document 2 discloses a plant optimum operation planning apparatus. The planning device disclosed in Patent Document 2 is configured to create a plant operation plan for a power plant or the like, comprehensively considering operation cost minimization, maintenance cost minimization, and the like. . The operation cost is calculated as an energy cost such as a fuel cost of a plant component device or a received power charge. As for the maintenance cost, when it is difficult to set the maintenance cost unit price of the plant component equipment, an equivalent maintenance cost is calculated by multiplying each of the equipment operation time, the number of start / stop times, etc. by a weighting factor.

Japanese Patent No. 4977064 JP 2006-48474 A

  However, in the configurations of Patent Documents 1 and 2, a plan is made in consideration of the fact that the life of the equipment is extended or shortened according to the operating state of the plant constituent equipment, and the necessary maintenance interval varies. I couldn't. Accordingly, there remains room for improvement from the viewpoint of reducing the cost when viewed as a composite energy system as a whole.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to create an operation plan that can appropriately suppress the operating cost of the composite energy system as a whole.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to the 1st viewpoint of this invention, the plan preparation apparatus of the following structures is provided. That is, the plan creation device creates an operation plan and a maintenance plan for the composite energy system in a composite energy system including a plurality of energy supply devices that supply energy to the energy demand facility. The plan creation device includes an equipment life acquisition unit, an evaluation function generation unit, an operation plan creation unit, and a maintenance plan creation unit. The device life acquisition unit acquires a device life indicating a life time of each energy supply device. The pre-evaluation function generation unit takes into consideration the influence on the life of the equipment due to the operating state of the energy supply equipment, and evaluates the evaluation function for evaluating the operation cost and the maintenance cost for operating and maintaining the composite energy system. Generate. The operation plan creation unit creates the operation plan based on the evaluation function so that the total amount of the operation cost and the maintenance cost is reduced while satisfying the energy demand in the energy demand facility. The maintenance plan creation unit creates the maintenance plan according to the operation plan created by the operation plan creation unit.

  As a result, the operation plan and the maintenance plan can be made so that the total amount of the operation cost and the maintenance cost is reduced in consideration of the device life. As a result, the cost when viewed as the entire composite energy system can be suppressed.

  According to the second aspect of the present invention, the following plan creation method is provided. That is, this plan creation method is a method of creating an operation plan and a maintenance plan of the composite energy system in a composite energy system including a plurality of energy supply devices that supply energy to the energy demand facility. This plan creation method includes a device life acquisition process, an evaluation function generation process, an energy demand acquisition process, an operation plan creation process, and a maintenance plan creation process. In the device lifetime acquisition step, a device lifetime indicating the lifetime of each energy supply device is acquired. In the evaluation function generation step, an evaluation function for evaluating an operation cost and a maintenance cost for operating and maintaining the composite energy system in consideration of an influence on the life of the device due to an operating state of the energy supply device. Generate. In the energy demand acquisition step, energy demand in the energy demand facility is acquired. In the operation plan creation step, the operation plan is created based on the evaluation function so that the total amount of the operation cost and the maintenance cost is reduced while satisfying the energy demand. In the maintenance plan creation step, the maintenance plan is created according to the operation plan created in the operation plan creation step.

  As a result, the operation plan and the maintenance plan can be made so that the total amount of the operation cost and the maintenance cost is reduced in consideration of the device life. As a result, the cost when viewed as the entire composite energy system can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the operation plan which can suppress appropriately the operating cost of a composite energy system can be created.

1 is a block diagram showing a composite energy system according to an embodiment of the present invention. The block diagram of the plan preparation apparatus in a composite energy system. The flowchart which shows the process performed by the plan preparation apparatus in order to make an operation plan and a maintenance plan when examining in advance before installation of equipment in a composite energy system. The flowchart which shows the process performed by the plan preparation apparatus in order to recreate an operation plan and a maintenance plan, after starting actual operation in a composite energy system. The figure which shows the specific example in case the correction | amendment apparatus lifetime calculated in the correction | amendment apparatus lifetime calculation part differs from the apparatus lifetime substituted to the last evaluation function more than a threshold value. FIG. 6 is a diagram illustrating a specific example in which an evaluation function is generated in consideration of the corrected device life shown in FIG. 5 in place of the device life and an operation plan is rebuilt based on the evaluation function.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a composite energy system 1 according to an embodiment of the present invention.

  A composite energy system 1 shown in FIG. 1 includes a plurality of energy supply devices 5, 9, 13, 14, 15 and a factory (energy demand facility) 12. The energy supply devices 5, 9, 13, 14, and 15 supply energy to the factory 12 by consuming fuel. The factory 12 is a plant that consumes the energy supplied from the energy supply devices 5, 9, 13, 14, and 15.

  In this embodiment, the plurality of energy supply devices 5, 9, 13, 14, 15 are constituted by three cogeneration systems 13, 14, 15, one gas engine 5, and one gas fired boiler 9. Is done.

  The cogeneration system 13 includes a gas turbine 2 that is driven by consuming gas fuel, and an exhaust heat boiler 6 that produces steam by introducing exhaust gas discharged from the gas turbine 2. In the cogeneration system 13, when the gas turbine 2 is driven, the generator is driven to produce electric power, and at the same time, the exhaust gas discharged from the gas turbine 2 is supplied to the exhaust heat boiler 6 as thermal energy. Of steam is produced.

  The cogeneration system 14 includes a gas turbine 3 and an exhaust heat boiler 7 having different device characteristics from the gas turbine 2 and the exhaust heat boiler 6 described above. In the cogeneration system 14, when the gas turbine 3 is driven, the generator is driven to produce electric power, and at the same time, the exhaust gas discharged from the gas turbine 3 is supplied to the exhaust heat boiler 7 as thermal energy. Of steam is produced.

  The cogeneration system 15 includes a gas engine 4 that is driven by consuming gas fuel, and an exhaust heat boiler 8 that produces steam by introducing exhaust gas discharged from the gas engine 4. In the cogeneration system 15, when the gas engine 4 is driven, a generator is driven to produce electric power, and at the same time, exhaust gas discharged from the gas engine 4 is supplied to the exhaust heat boiler 8 as thermal energy. Of steam is produced.

  The gas engine 5 is driven by consuming gas fuel. The gas engine 5 provides power to a generator (not shown), and thereby electric power is produced.

  The gas fired boiler 9 produces steam as thermal energy by consuming gas fuel and heating water.

  As shown in FIG. 1, the electric power produced by the cogeneration systems 13, 14, 15 and the gas engine 5 is supplied to the factory 12. Further, external power (commercial power) 10 is supplied to the factory 12 as necessary.

  A part of the steam produced in the exhaust heat boilers 6, 7, 8 and the gas fired boiler 9 is supplied to the chiller 11. In the chiller 11, the heat medium is circulated to produce cold water. This cold water is supplied to the factory 12 and used for cooling and the like.

  The remaining steam produced in the exhaust heat boilers 6, 7, 8 and the gas fired boiler 9 is supplied to the factory 12 and used for production equipment, hot water supply, heating, and the like.

  The cogeneration system 13, the cogeneration system 14, the cogeneration system 15, the gas engine 5, and the gas fired boiler 9 (energy supply equipment, each of which may be hereinafter referred to as “equipment”) supply fuel. It is connected to a fuel supply device (not shown). These devices are electrically connected to a control device (not shown) for controlling the drive (operation) state. In addition, these devices, the factory 12, the fuel supply device, and the control device are connected to a later-described plan creation device 20 (see FIG. 2) via a network. With this configuration, the plan creation device 20 can transmit and receive data to and from each device, the factory 12, the control device, and the like. Thereby, as will be described in detail later, the plan creation device 20 can present the optimum operation plan and assist the operation of the operator.

As shown in FIG. 2, the plan creation apparatus 20 is connected to the database 16 via a network. The database 16 includes parameters to be described later, specifically, fuel cost (F _i ) for each device, received power charge (B _t ), equivalent operation time (G _i ) of the device i per day, and more specifically. Specifically, values such as α, β) and the maintenance cost (M _i ) for each device are stored. However, the database 16 may be constructed inside the plan creation device 20.

  Below, with reference to FIG. 2, the detailed structure of the plan preparation apparatus 20 is demonstrated. FIG. 2 is a block diagram of the plan creation device 20 in the composite energy system 1.

  As shown in FIG. 2, the plan creation device 20 includes a device life acquisition unit 21, an evaluation function generation unit 22, an operation plan creation unit 23, a maintenance plan creation unit 24, a correction device life calculation unit (correction device lifespan). Acquisition unit) 25.

  The plan creation apparatus 20 is configured as a computer such as a personal computer, for example, and includes a calculation unit (CPU) and a storage unit (ROM, RAM, etc.) not shown. The storage unit stores a plan creation program for creating an operation plan and a maintenance plan for the composite energy system 1. Through the cooperation of the hardware and software described above, the plan creation apparatus 20 is changed from the device life acquisition unit 21, the evaluation function generation unit 22, the operation plan creation unit 23, the maintenance plan creation unit 24, the corrected device life calculation unit 25, and the like. Can be operated as

  The plan creation device 20 takes into consideration that the substantial device life length of each device is affected by the operating state of the device, and thus the overall operation cost and maintenance cost of the composite energy system 1 are reduced. Thus, an operation plan and a maintenance plan are created.

  The device lifetime acquisition unit 21 acquires an initial value of the lifetime of each device. Specifically, the device lifetime acquisition unit 21 estimates the period from the start of operation of each device until the first maintenance is required before the actual operation of the factory 12 is started. (Hereinafter may be referred to as “initial life”). In the present embodiment, the initial lifetime of each device is input in advance by an operator or the like and acquired by the device lifetime acquisition unit 21.

  The evaluation function generation unit 22 generates an evaluation function for evaluating the overall operation cost and maintenance cost necessary for operating and maintaining the composite energy system 1. The evaluation function generation unit 22 is input with the daily power demand and heat demand values in the factory 12 via the network described above. Here, in this embodiment, the daily power demand pattern and the heat demand pattern of the factory 12 acquired from the database 16 are input as the above-described power demand and heat demand. Details of the evaluation function will be described later.

  The plurality of constraint conditions input to the evaluation function generation unit 22 include the power demand and the heat demand. The power demand and heat demand described above may be calculated taking into account demand results in the same period prior to the previous year, recent demand results, weather forecasts (particularly temperature fluctuations), and the like. Although not shown, as other constraints, operational constraints in the composite energy system 1, constraints due to constraints due to the characteristics (performance) of each device, and the like are input to the evaluation function generation unit 22. .

  Based on the evaluation function generated by the evaluation function generation unit 22, the operation plan creation unit 23 satisfies a plurality of constraint conditions including at least power demand and heat demand, while reducing the total amount of operation cost and maintenance cost. In addition, in this embodiment, a comprehensive operation plan of a plurality of devices is calculated by an optimization method (to be the minimum in this embodiment). Although any known method can be applied as the optimization method, particle group optimization, which is a kind of metaheuristic method, is used in this embodiment.

  The maintenance plan creation unit 24 creates a comprehensive maintenance plan for a plurality of devices according to the operation plan created by the operation plan creation unit 23. Specifically, the maintenance plan creation unit 24 creates a maintenance plan for each device so that the maintenance of each device is performed when or before each device reaches the lifetime in the operation plan. .

  The corrected device life calculation unit 25 acquires operation data indicating the operation status of the device so far from the database 16 at an appropriate timing after the actual operation of the composite energy system 1 is started. Calculate the remaining life of the device and obtain it as the corrected device life. That is, taking into account the operation status of the device so far, the actual device life is shorter or longer (changed) than the remaining life based on the initial life acquired by the device life acquisition unit 21. There are cases. Therefore, the corrected device life calculation unit 25 may be referred to as a corrected device life (hereinafter referred to as “corrected device life”) as a timely and accurate device life that reflects past operation data and is more timely than the initial life. )).

  Below, the evaluation function produced | generated by the evaluation function production | generation part 22 is demonstrated in detail. The evaluation function J of the present embodiment evaluates the total amount of total operation cost and maintenance cost per day required to operate and maintain the composite energy system 1, and is expressed by the following equation (1). expressed.

Of the first term on the right side of Equation (1), F _i represents the fuel cost (yen) of device i. In the present embodiment, F _i is expressed as a function of the operation state x _{i, t} from (t−1) time to t time of the device i (where t is an integer from 1 to 24). Here, the operation state of the device i is a variable indicating a load factor, a start / stop state, and the like of the device i. That is, the first term on the right side of Equation (1) represents the sum of the fuel costs per day for each device (fuel cost per day for all devices).

Of the second term on the right side of Equation (1), B _t represents the received power charge (yen / kWh) from (t−1) to t. Of the second term of Equation (1), y _t denotes the power received (t-1) from the time until t (kW). Therefore, the second term on the right side of Equation (1) represents the electricity charge for purchasing power per day, in other words, the charge per day for the power received from the external power 10 shown in FIG.

  As described above, the sum of the first term and the second term on the right side of the formula (1) means the energy cost per day in the composite energy system 1.

Of the third term on the right side of Equation (1), G _i represents the equivalent operation time (h) of the device i per day. In the present embodiment, the G _i, the operating state of the 24 hours of instrument _{i x i, 1, x i} , 2, ···, are expressed as a function of x i, _24. The equivalent operation time will be described in detail later.

Of the third term on the right side of Equation (1), T _i represents the lifetime (h) of the device i. The value obtained by dividing G _i by T _i (G _i / T _i ) means the frequency (converted value per day) at which maintenance is required in the device i. That is, in this evaluation function, the maintenance cost is evaluated on the assumption that maintenance is required whenever the equivalent operation time of the device i reaches the lifetime of the device i.

Of the third term on the right side of Equation (1), M _i is the maintenance cost (yen) per device i. The value obtained by multiplying the above M _i by G _i / T _i represents the maintenance cost (converted value per day) of the device i. Therefore, the third term on the right side of Equation (1) represents the sum of the maintenance costs per day for each device (maintenance costs per day for all devices).

  As described above, in the evaluation function generated by the evaluation function generation unit 22, the total of the total operation cost and maintenance cost in units of one day (24 hours) required to operate and maintain the composite energy system 1. The forehead (J) is evaluated.

Here, in this embodiment, G _i representing the equivalent operation time of the device i is represented by the following formula (2).

Here, “actual operation time”, “number of start / stop times”, and “high load operation time” in Expression (2) are the operation states x _{i, 1} , x _{i, 2} ,. .., X _{i, 24} is given, it can be easily calculated. The weighting factor α multiplied by the number of times of starting and stopping is determined in consideration of how many hours of normal operation the deterioration of the device i caused by starting and stopping once is determined. The weighting factor β multiplied by the high load operation time is determined in consideration of how fast the deterioration of the device i proceeds as compared with the normal operation by performing the high load operation.

  This makes it possible to estimate when maintenance is required for each device i based on the equivalent operation time calculated according to the operation plan of each device i, and evaluate the maintenance cost according to the operation plan. can do.

  That is, as a calculation method different from the calculation method of the present embodiment, maintenance is performed by dividing the actual operation time of each device that does not particularly consider the operation state (load size, etc.) by the lifetime of the device. It is also conceivable to obtain the frequency (and thus the maintenance time) that is required. However, in this method, no consideration is given to the number of times of starting and stopping the equipment, the high load operation time, and the like, and it is not possible to estimate when maintenance is necessary in accordance with actual operation. In this regard, in the evaluation function of the present embodiment, by dividing the equivalent operation time in consideration of the number of start / stop times of the device and the high load operation time by the life time of the device, the time when maintenance is required (as a result, Maintenance time) is calculated. Therefore, it is possible to estimate the time when the maintenance is necessary while appropriately considering that the end of the device life is substantially advanced in the operation that frequently uses the operation state that is likely to deteriorate.

In the formula (1), decision variables, 24 hours of operation state x _i of each device _i, and _t, which is of 24 hours received power y _t. The creation of an operation plan is nothing more than finding the above decision variables by solving an optimization problem using Equation (1) as an evaluation function.

  When creating the operation plan of the composite energy system 1 using the evaluation function J described above, the power demand formula shown in the following formula (3) and the steam demand formula shown in the formula (4) are used as constraints. Be considered.

In Expression (3), E _t ^{dem on} the left side represents the power demand (kW) from (t−1) to t. Of the right side of Equation (3), E _{i in} the first term represents the power generation amount (kW) of the device i. In the present embodiment, E _i is expressed as a function of the operation state x _{i, t} from (t−1) time to t time of the device i. Y _t in the second term of the right side of the equation (3) represents the power received (t-1) from the time until t (kW). That is, Expression (3) represents that the sum of the amount of power generated in the composite energy system 1 and the amount of purchased power must be equal to the power demand at any time of the day.

Of the formula (4), the left side of the S _t ^dem represents the steam demand (t-1) from the time until t (tonnes / h). S _{i on} the right side of Equation (4) represents the amount of steam generated (ton / h) of the device i. In the present embodiment, S _i is expressed as a function of the operating state x _{i, t} from (t−1) time to t time of the device i. That is, equation (4) represents that at any point in the day, the amount of steam generated in the combined energy system 1 must be equal to or greater than the steam (heat) demand.

  In the following, in the composite energy system 1, refer to the flowchart of FIG. 3 for processing performed by the plan creation device 20 in order to make an operation plan and a maintenance plan of the composite energy system 1 at the stage of preliminary examination before the introduction of equipment. And will be described in detail.

First, the device life acquisition unit 21 of the plan creation device 20 acquires the value of the initial life of each device (step S101, device life acquisition step). Thus, evaluation function being assigned device lifetime (in this case, initial lifetime) after the value of T _i is obtained. Subsequently, the evaluation function generation unit 22 of the plan creation device 20 generates necessary parameters (specifically, in this embodiment, from (t−1) time to t time in order to generate the above-described evaluation function. Database of received power charges B _t , maintenance cost M _i for each device, parameters for determining fuel cost F _i , parameters for determining equivalent operation time G _i of device i per day, etc. 16 (step S102). Subsequently, the evaluation function generation unit 22 substitutes the value of the parameter (B _t ) acquired in step S102 into the equation (1), and calculates the initial lifetime value of each device acquired in step S101 as the device lifetime (T _An evaluation function is generated by substituting as the value of _i ) (step S103, evaluation function generation step).

  Subsequently, the evaluation function generation unit 22 of the plan creation device 20 acquires a plurality of constraint conditions including power demand and heat demand (step S104, energy demand acquisition step). The constraint conditions include those described in the above formulas (3) and (4).

Subsequently, the operation plan creation unit 23 of the plan creation device 20 calculates an operation plan that minimizes the sum of the operation cost and the maintenance cost (that is, the value of J) while satisfying the constraint condition acquired in step S104. (Step S105, operation plan creation process). Specifically, 24 hours of operation state x _i of the device _{i, t} and received power y _t is computed.

Subsequently, the maintenance plan creation unit 24 of the plan creation device 20 calculates a maintenance plan for each device in accordance with the operation plan calculated in step S105 (step S106, maintenance plan creation process). That is, in each device i, a maintenance plan is created so that troubles such as sudden stop of operation due to the end of the life of the device do not occur, and maintenance can be performed efficiently. Specifically, the equivalent operation time G _i is such that maintenance time to reach the lifetime is performed, to create a maintenance plan.

  Taking into consideration that the device life of each device in the composite energy system 1 is affected by the operating state of the device by performing the series of processing from step S101 to step S106 shown above in the plan creation device 20. Thus, the operation plan and the maintenance plan can be made so that the total amount of the operation cost and the maintenance cost becomes small. Thereby, the cost when the composite energy system 1 is viewed comprehensively can be suppressed.

  As described above, the plan creation apparatus 20 according to the present embodiment includes a plurality of devices (energy supply devices) 5, 9, 13, 14, and 15 that supply energy to the factory (energy demand facility) 12. In the system 1, an operation plan and a maintenance plan for the composite energy system 1 are created. The plan creation device 20 includes a device lifetime acquisition unit 21, an evaluation function generation unit 22, an operation plan creation unit 23, and a maintenance plan creation unit 24. The device life acquisition unit 21 acquires a device life (initial life) indicating the life time of each device 5, 9, 13, 14, 15. The evaluation function generation unit 22 takes into consideration the influence on the life of the equipment due to the operating state of each equipment 5, 9, 13, 14, 15, and the operation cost and maintenance cost for operating and maintaining the composite energy system 1. An evaluation function J for evaluating is generated. Based on the evaluation function J, the operation plan creation unit 23 creates an operation plan so that the total amount of the operation cost and the maintenance cost is reduced while satisfying the energy demand at the factory 12. The maintenance plan creation unit 24 creates a maintenance plan according to the operation plan created by the operation plan creation unit 23.

  As a result, it is possible to make an operation plan and a maintenance plan so that the total amount of the operation cost and the maintenance cost is reduced in consideration of the life of the equipment, and the cost when viewed as the composite energy system 1 as a whole can be suppressed. it can.

Further, in the plan creation device 20 of the present embodiment, the evaluation function generation unit 22 has the equivalent operation time (G _i in the equation (1)) in the operation plan of each device 5, 9, 13, 14, 15 as the device. Evaluation function J for evaluating the maintenance cost by estimating that the maintenance cost for each time of the devices 5, 9, 13, 14, 15 is incurred every time the lifetime of 5, 9, 13, 14, 15 is reached. Is generated.

  As a result, the maintenance cost can be evaluated by estimating the time when maintenance is required more accurately than when the calculation is based on the normal operation time instead of the equivalent operation time.

In the plan creation device 20 of the present embodiment, the equivalent operation time (G _i in the equation (1)) in the operation plan of the devices 5, 9, 13, 14, 15 is the devices 5, 9, 13, 14 , 15 and the number of start and stop times and the high load operation time, respectively, multiplied by weighting factors α and β are added to the operation time of the device (formula (2 )).

Thereby, the time when the maintenance is required is estimated based on the equivalent operation time (G _i in the equation (1)) calculated in accordance with the operation plan of the devices 5, 9, 13, 14, 15. Maintenance costs can be evaluated. In addition, by appropriately setting the values of the weighting factors α and β, the time when maintenance is required in each of the devices 5, 9, 13, 14, and 15 can be accurately obtained.

  Moreover, in the plan creation apparatus 20 in the present embodiment, the plurality of devices 5, 9, 13, 14, and 15 include cogeneration systems (co-generation devices) 13, 14, and 15. The operation plan creation unit 23 creates an operation plan so as to satisfy both power demand and heat demand (steam demand) as energy demand at the factory 12.

  Thereby, in the composite energy system 1, high total energy efficiency is realizable at low cost using the cogeneration system 13,14,15 as cogeneration equipment.

  Moreover, the plan creation method in this embodiment is the composite energy system 1 including a plurality of devices (energy supply devices) 5, 9, 13, 14, 15 that supply energy to the factory (energy demand facility) 12. This is a method for creating an operation plan and a maintenance plan for the energy system 1. This plan creation method includes a device life acquisition process, an evaluation function generation process, an energy demand acquisition process, an operation plan creation process, and a maintenance plan creation process. In the device life acquisition step, a device life (initial life in the present embodiment) indicating the life time of the devices 5, 9, 13, 14, 15 is acquired. In the evaluation function generation process, the operation cost and the maintenance cost for operating and maintaining the composite energy system 1 are evaluated in consideration of the influence of the operation state of the devices 5, 9, 13, 14, and 15 on the device life. An evaluation function J is generated. In the energy demand acquisition process, the energy demand at the factory 12 is acquired. In the operation plan creation process, an operation plan is created based on the evaluation function J so that the total amount of operation costs and maintenance costs is reduced while satisfying the energy demand. In the maintenance plan creation process, a maintenance plan is created according to the operation plan created in the operation plan creation process.

  As a result, it is possible to make an operation plan and a maintenance plan so that the total amount of the operation cost and the maintenance cost is reduced in consideration of the life of the equipment, and the cost when viewed as the composite energy system 1 as a whole can be suppressed. it can.

  In the following, referring to the flowchart of FIG. 4 for processing performed by the plan creation device 20 in order to re-create the operation plan and maintenance plan of the composite energy system 1 as appropriate after starting the actual operation in the composite energy system 1. And will be described in detail.

  First, the corrected device life calculation unit 25 of the plan creation device 20 calculates the value of at least one corrected device life of the device by referring to the operation data of the device (corrected device life calculation step). In step S201, the plan creation device 20 determines whether or not the corrected device life has been acquired. As a result, when the corrected device life is acquired (step S201, Yes), the process proceeds to the next step S202. If the corrected device lifetime has not been acquired (No in step S201), monitoring is continued until the corrected device lifetime is acquired (the determination in step S201 is repeated).

  Subsequently, the generation unit 22 of the plan creation device 20 determines whether or not the operation plan and the maintenance plan need to be recreated. Compared with the remaining life based on the device life assigned to the evaluation function in order to make a plan, it is determined whether or not the difference is more than a threshold value (step S202).

  As a result of the determination in step S202, if the corrected device life is different from the remaining life based on the device life assigned last time by a threshold or more (Yes in step S202), the change in device life (change in value before and after correction) Therefore, the process of re-creating the operation plan and the maintenance plan using the corrected device life as the device life is performed (step S203 to step S207).

Specifically, the evaluation function generation unit 22 of the plan creation device 20 generates necessary parameters (specifically, in this embodiment, from (t−1) time to t time in order to generate the above-described evaluation function. The value of the received power charge B _t ) is acquired from the database 16 (step S203). Subsequently, the value of the parameter (B _t ) acquired in step S203 is substituted into the equation (1), and the value of the corrected device life is substituted into the equation (1) as the device life (T _i ) value. Thus, the corrected evaluation function is created (step S204, evaluation function correction step).

  Subsequently, the evaluation function generation unit 22 of the plan creation device 20 acquires a plurality of constraint conditions including power demand and heat demand (step S205, energy demand acquisition step). Subsequently, the operation plan creation unit 23 of the plan creation device 20 satisfies the constraint conditions acquired in step S205 based on the new evaluation function created as a result of the process in step S204, while reducing the operation cost and the maintenance cost. An operation plan that minimizes the sum (ie, the value of J) is created (step S206, operation plan correction step). That is, the operation plan is updated.

  Subsequently, the maintenance plan creation unit 24 of the plan creation device 20 creates a maintenance plan for each device in accordance with the operation plan newly created in step S206 (step S207, maintenance plan correction step). That is, the maintenance plan is also updated according to the updated operation plan.

  A series of processing from step S201 to step S207 described above is performed by the plan creation device 20, so that in the composite energy system 1, operation data after the actual operation of the composite energy system 1 is started (each Taking into account the operation history of the device, it is possible to calculate a device life (corrected device life) that is timely and more accurate than the initial life. Then, it is possible to appropriately recreate the operation plan and the maintenance plan by reflecting this accurate device life (corrected device life).

  The operation data referred to in order to calculate the corrected device life of the device by the corrected device life calculation unit 25 includes, for example, the actual operation time of the device, the number of start / stop times, the high load operation time, the temperature sensor detection value, and The pressure sensor detection value and the like are included, but are not limited thereto. That is, in addition to or instead of these, other values (for example, data indicating the past operation history of the device) may be included.

  FIG. 5 shows the result of calculating the corrected device life by referring to the operation data in the corrected device life calculation unit 25 of the plan creation device 20. As a result, this corrected device life is the remaining life based on the device life assigned to the previous evaluation function. A specific example in the case of different from the threshold value is illustrated. In the case of FIG. 5, the corrected device life is shorter than the remaining life based on the device life assigned to the previous evaluation function.

  In the case illustrated in FIG. 5, if the operation of the device is continued with the operation plan established last time, the lifetime of the device comes early. Therefore, in the present embodiment, the operation plan and the maintenance plan are re-established by reflecting the corrected device life acquired by the corrected device life calculator 25. Thereby, for example, as shown in FIG. 6, the number of start / stop times when operating this device (the device whose corrected device life has become shorter than the remaining life based on the previous device life as a result of the remaining life diagnosis) By re-creating the operation plan modified so that the load operation time is reduced by the operation plan creation unit 23 and operating this device according to this operation plan, the device can be used for a longer time. FIG. 6 is a diagram illustrating a specific example in which an evaluation function is generated in consideration of the corrected device life instead of the device life, and the operation plan is reestablished based on the evaluation function.

  The graph of FIG. 6 shows the relationship between the actual time and the equivalent operation time when operating a certain device. In the initial operation plan, based on the estimated initial life, it was assumed that the life reached at time A in the real time and maintenance was performed. However, as a result of performing the remaining life diagnosis at a certain point in time, the obtained remaining life (corrected device life) is shorter than originally assumed, and if operation is continued as before, maintenance must be performed at time B in real time. Suppose that it turns out. In this case, as shown by a thick broken line, for example, by recreating an operation plan that suppresses an increase in equivalent operation time by shortening the ratio of the high load operation time of the device, the actual maintenance must be performed. It is possible to delay the time when it is not necessary until a time point C later than B.

  That is, when the maintenance interval is shortened, it can be considered that the maintenance cost increases accordingly. Therefore, in this embodiment, when the lifetime becomes too short, the balance between the energy cost and the maintenance cost is readjusted by using the above-described optimization method.

  In the example shown in FIG. 6, the equipment operation plan is modified so that the slope of the increase in equivalent operation time is small, but this is merely an example. For example, it may be possible to reduce the overall cost by correcting the operation plan so that the slope of the increase in equivalent operation time is increased in some devices.

As described above, the plan creation apparatus 20 according to the present embodiment acquires the corrected device lifetime indicating the lifetime of each device 5, 9, 13, 14, 15 after the operation of the composite energy system 1 is started. A correction device life calculation unit 25 is further provided. If the corrected device life is different from the remaining life based on the device life assigned to the previous evaluation function, the evaluation function generation unit 22 replaces the device life with a new evaluation function (equation (1) to T _i of) generates a function) obtained by substituting the correction device lifetime. The operation plan creation unit 23 recreates the operation plan based on the new evaluation function. The maintenance plan creation unit 24 recreates the maintenance plan according to the new operation plan.

  As a result, the operation plan and maintenance plan are created to reflect the more accurate device life (corrected device life) calculated by taking into account the operation data after the actual operation of the complex energy system 1 is started. Can be redone.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  The composite energy system 1 of the above embodiment includes the cogeneration systems 13, 14, 15, the gas engine 5 and the gas fired boiler 9 as energy supply devices. However, the present invention is not limited to this. Instead of or in addition to this, a BTG (Boiler Turbine Generator), a boiler, a garbage incineration plant, a solar power generation device, a wind power generation device, or the like may be provided.

  In the above embodiment, only when the corrected device life is acquired by the corrected device life calculation unit 25 and the corrected device life is different from the device life assigned to the previous evaluation function by a threshold value or more, the operation plan and the maintenance plan. However, the present invention is not limited to this. For example, considering the degree of change in calculation conditions (for example, constraint conditions and parameters to be substituted into the evaluation function. More specifically, for example, power demand and electricity / gas charges) When the merit of performing the re-creation is great, the operation plan and the maintenance plan may be re-established in the same flow as shown in FIG.

  The reconstruction of the operation plan and the maintenance plan may be performed instantaneously as the calculation conditions change.

  In the above-described embodiment, the combined energy system 1 includes the cogeneration systems (cogeneration devices) 13, 14, and 15 as heat (steam) supply devices, but is not limited thereto. That is, instead of this, a heat (steam) supply device (for example, a gas fired boiler) that supplies only thermal energy and a power supply device that supplies only electric power may be provided separately.

The time unit of the evaluation function is not limited to one day, and may be longer or shorter. For example, by preparing multiple operation patterns according to whether it is a weekday or a holiday, and evaluating the total amount of energy cost and maintenance cost with a long-term (for example, one year) evaluation function, a more appropriate operation plan can be obtained. it can. More specifically, the evaluation function J _y (total amount of total operation cost and maintenance cost per year) is expressed by the following formula, for example.
J _y = D _a × J _a + D _b × J _b
However,
J _a : Total amount of total operation cost and maintenance cost per day on weekdays J _b : Total amount of total operation cost and maintenance cost per day on holidays D _a : Number of weekdays per year D _b : Days of holiday per year It is. J _a and J _b in the formula, the decision variables are used in the weekday in J _a, except that the decision variable is used on holidays in J _b is the same as the evaluation function J of the aforementioned formula (1) Detailed description will be omitted. Also in constraints when optimization, in accordance with decision variables weekday constraints J _a, except decision variables J _b is in accordance with the holiday constraints, and the above equation (3) and (4) You can think in the same way.

  The evaluation function may take into account the amount of power transmitted to the outside when the composite energy system 1 considers power sales. That is, a term for subtracting the power sales revenue (yen) per day from the energy cost may be added on the right side of Equation (1).

1 Combined energy system 5 Gas engine (energy supply equipment)
9 Gas fired boiler (energy supply equipment)
12 factories (energy demand facilities)
13 Cogeneration system (energy supply equipment, cogeneration equipment)
14 Cogeneration system (energy supply equipment, cogeneration equipment)
15 Cogeneration system (energy supply equipment, cogeneration equipment)
DESCRIPTION OF SYMBOLS 20 Plan preparation apparatus 21 Equipment lifetime acquisition part 22 Evaluation function production | generation part 23 Operation plan creation part 24 Maintenance plan preparation part 25 Compensation equipment lifetime calculation part (correction equipment lifetime acquisition part)

Claims (7)

In a composite energy system comprising a plurality of energy supply devices for supplying energy to energy demand equipment, a plan creation device for creating an operation plan and a maintenance plan for the composite energy system,
A device life acquisition unit for acquiring a device life indicating a life time of each energy supply device;
An evaluation function generator for generating an evaluation function for evaluating an operation cost and a maintenance cost for operating and maintaining the composite energy system in consideration of an influence on the life of the device due to an operation state of the energy supply device; ,
Based on the evaluation function, while satisfying the energy demand in the energy demand facility, an operation plan creation unit that creates the operation plan so that a total amount of the operation cost and the maintenance cost is reduced,
In accordance with the operation plan created by the operation plan creation unit, a maintenance plan creation unit that creates the maintenance plan,
A plan creation device comprising: The plan creation device according to claim 1,
The evaluation function generation unit estimates that the maintenance cost per one time of the device is incurred every time the equivalent operation time in the operation plan of each energy supply device reaches the lifetime of the device. A plan creation device characterized by generating an evaluation function to be evaluated. The plan creation device according to claim 2,
The equivalent operation time in the operation plan of each energy supply device is obtained by multiplying each of a plurality of decision variables including the number of start / stop times of the device and a high load operation time by a weighting factor. A plan creation device characterized by being calculated by adding to time. The plan creation device according to any one of claims 1 to 3,
After the operation of the composite energy system is started, further comprising a correction device lifetime acquisition unit for acquiring a correction device lifetime indicating a lifetime of each energy supply device,
The evaluation function generation unit generates a new evaluation function that takes the correction device life into account instead of the device life when the correction device life is different from the device life,
The operation plan creation unit recreates the operation plan based on the new evaluation function,
The maintenance plan creation unit recreates the maintenance plan according to the re-created operation plan. A plan creation device according to any one of claims 1 to 4,
The plurality of energy supply devices include a cogeneration device,
The said operation plan preparation part produces the said operation plan so that both the electric power demand and heat demand as the said energy demand in the said energy demand installation may be satisfy | filled, The plan preparation apparatus characterized by the above-mentioned. In a composite energy system including a plurality of energy supply devices that supply energy to energy demand facilities, a plan creation method for creating an operation plan and a maintenance plan of the composite energy system,
A device life acquisition step of acquiring a device life indicating a life time of each energy supply device;
An evaluation function generating step for generating an evaluation function for evaluating an operation cost and a maintenance cost for operating and maintaining the composite energy system in consideration of an influence on an operation life of the energy supply device. ,
An energy demand acquisition step for acquiring energy demand in the energy demand facility;
Based on the evaluation function, while satisfying the energy demand, an operation plan creation step of creating the operation plan so that a total amount of the operation cost and the maintenance cost is reduced,
In accordance with the operation plan created in the operation plan creation step, a maintenance plan creation step for creating the maintenance plan,
A plan creation method characterized by comprising: It is the plan preparation method of Claim 6, Comprising:
After the operation of the composite energy system is started, taking into account operation data indicating the operation state of each energy supply device up to that time, a correction for calculating a correction device lifetime indicating a lifetime of each energy supply device Equipment life calculation process,
When the corrected device life is different from the device life, an evaluation function correction step for generating a new evaluation function taking into account the corrected device life instead of the device life;
Based on the new evaluation function instead of the evaluation function, an operation plan correction step for recreating the operation plan,
A maintenance plan correction step for re-creating a maintenance plan according to the re-created operation plan;
A plan creation method characterized by comprising:

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