Energy management system, energy management program, and energy management method

Abstract

To manage many kinds of energies at a high level so that economical efficiency or environmental property may be improved, or both of the economical efficiency and the environmental property may be improved while maintaining a stable supply to a target area.SOLUTION: An energy management system for controlling energy supply equipment arranged in a target area includes: a long-period processing unit for calculating energy demand forecast information of the target area and calculating a purchase plan of energy, a sales plan, and an energy storage plan based on the energy demand forecast information; a medium-period processing unit for calculating a start / stop plan of apparatuses included in the energy supply equipment according to the energy demand forecast information, the purchase plan of energy, the sales plan, and the energy storage plan calculated by the long-period processing unit; and a short-period processing unit for calculating control target information according to the energy storage plan calculated by the long-period processing unit and the start / stop plan calculated by the medium-period processing unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an energy management system, an energy management program, and an energy management method. [Background technology]

[0002] Conventionally, a known technology for managing electricity in a region is, for example, the following Patent Document 1. In the electricity management system described in Patent Document 1, a first electricity management device (CEMS) installed in a specified area communicates with each consumer device in the specified area and predicts the electricity supply and demand balance in the specified area. The first electricity management device calculates surplus electricity from the predicted supply and demand balance and encourages each consumer to consume the surplus electricity. In this way, the electricity management system prioritizes consumption of electricity generated in a specified area within that area.

[0003] The power management system also has a short-cycle real-time feedback control function, a medium-cycle real-time feedback control function, and a long-cycle prediction function. The short-cycle real-time feedback control function monitors and feedback-controls, for example, PV and storage batteries in short cycles (e.g., in units of seconds). The medium-cycle real-time feedback control function monitors and feedback-controls devices such as heat storage devices in medium cycles (e.g., in units of hours). The long-cycle prediction function predicts the power generation amount of each distributed power source in the area, power demand, and the amount of interconnection between systems in long cycles (e.g., in units of several hours). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Republished WO2012 / 066651 Summary of the Invention [Problem to be solved by the invention]

[0005] A regional EMS (regional energy management system) collects and accumulates energy-related data from a group of buildings that are energy supply destinations in an area such as a region, and supports energy operations such as prediction, optimal planning, and optimal control through data analysis. In a regional EMS, the energy that needs to be managed in the region is not limited to electricity, but includes many other types of energy such as fuel energy and thermal energy. A regional EMS needs to manage the supply of these many types of energy and supply energy from each energy supply facility to each energy supply destination facility. However, the power management system described in Patent Document 1 predicts the power generation amount and power demand of each distributed power source in the region over a long period and performs feedback control over medium and short periods, and is therefore unable to handle the management of many types of energy.

[0006] Furthermore, when energy is shared and used within a region, the type and supply efficiency of energy in each energy supply facility may differ, and the type and amount (flow rate, supply differential pressure, temperature) of energy consumed by the energy supply destination facility may also differ. Furthermore, the locations of the energy supply facilities 300 and the energy supply destination facilities may be distributed to buildings in different locations, and the management entities of the buildings and facilities may be different. As described above, there are a wide variety of energy supply and demand relationships between multiple buildings, and the energy supply facilities and energy supply destination facilities are also distributed in areas, so advanced energy management is required. However, when energy management becomes complicated, equipment with low energy generation efficiency may be used, or operations with low energy transport efficiency may be performed.

[0007] Furthermore, in the regional EMS, an operator creates an operation plan for the energy supply facility 300 and controls the energy supply from the energy supply facility 300 to the energy supply destination facility 600. However, even if a daily plan is created, if the actual operation does not match the demand, the operator's workload may increase.

[0008] The present disclosure has been made in consideration of these circumstances, and aims to provide an energy management system, an energy management program, and an energy management method that can manage multiple types of energy in an advanced manner so as to improve economic or environmental friendliness, or to improve both economic and environmental friendliness, while maintaining a stable supply to a target area. [Means for solving the problem]

[0009] The present disclosure has been made to solve the above-mentioned problems, and one aspect of the present disclosure is an energy management system that controls energy supply equipment arranged in a target area, the energy management system including: a long-cycle processing unit that calculates energy demand forecast information for the target area, and calculates an energy purchase plan, a sales plan, and an energy storage plan based on the calculated energy demand forecast information; a medium-cycle processing unit that calculates a start-up and shutdown plan for equipment included in the energy supply equipment in accordance with the energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan calculated by the long-cycle processing unit; and a short-cycle processing unit that calculates control target information in accordance with the energy storage plan calculated by the long-cycle processing unit and the start-up and shutdown plan calculated by the medium-cycle processing unit.

[0010] Another aspect of the present disclosure is a program that causes a computer to function as a long-cycle processing unit that calculates energy demand forecast information for a target area, and calculates an energy purchasing plan, a sales plan, and an energy storage plan based on the calculated energy demand forecast information, a medium-cycle processing unit that calculates a start-up and shutdown plan for equipment included in an energy supply facility located in the target area in accordance with the energy demand forecast information and the energy purchasing plan, sales plan, and energy storage plan calculated by the long-cycle processing unit, and a short-cycle processing unit that calculates control target information in accordance with the energy storage plan calculated by the long-cycle processing unit and the start-up and shutdown plan calculated by the medium-cycle processing unit.

[0011] Another aspect of the present disclosure is an energy management method for controlling energy supply equipment located in a target area, the energy management method including the steps of: an energy management system calculating energy demand forecast information for the target area, and calculating an energy purchase plan, a sales plan, and an energy storage plan based on the calculated energy demand forecast information; a step of the energy management system calculating a start-up and shutdown plan for equipment included in the energy supply equipment in accordance with the calculated energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan; and a step of the energy management system calculating control target information in accordance with the calculated heat storage plan and the calculated start-up and shutdown plan. Effect of the Invention

[0012] According to one aspect of the present invention, it is possible to manage multiple types of energy in a target area in an advanced manner. [Brief description of the drawings]

[0013] [Figure 1] 1 is a block diagram showing an example of an energy management system according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of an operational flow of the energy management system according to the embodiment. [Diagram 3] FIG. 2 is a diagram showing an example of the operation of the energy management system according to the embodiment. [Figure 4] FIG. 11 is a diagram showing an example of a heat storage plan calculated by long-period processing in the embodiment. [Diagram 5] FIG. 11 is a diagram showing an example of the heat storage amount in a heat storage tank, the medium flow rate in a heat dissipation heat exchanger, the bypass flow rate in a bypass system that circulates within an energy supply source facility, the supply and demand balance of flow rates, and a chilled water demand forecast based on a start-up and shutdown plan determined by medium-term processing in an embodiment. [Figure 6]FIG. 11 is a diagram illustrating an example of an optimization process in the energy management device according to the embodiment. [Figure 7] FIG. 1 is a diagram illustrating an example of a configuration of an energy supply facility according to an embodiment. [Figure 8] 1 is a diagram showing an example of the arrangement of energy supply facilities and energy supply destination facilities in a target area according to an embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] An energy management system, an energy management program, and an energy management method according to the present invention will be described below with reference to the drawings.

[0015] FIG. 1 is a block diagram showing an example of an energy management system 1 according to an embodiment. The energy management system 1 includes, for example, an energy management device 100, an operator terminal device 200, an energy supply facility 300, a power supply facility 400, a fuel supply facility 500, and an energy supply destination facility 600. The energy management device 100, the operator terminal device 200, the energy supply facility 300, the power supply facility 400, the fuel supply facility 500, and the energy supply destination facility 600 each have a communication interface (not shown) such as a network interface card (NIC) or a wireless communication module for connecting to a communication network such as the Internet. The network may include, for example, a general-purpose network such as the Internet, and a private network such as local 5G or WiFi (registered trademark). The energy management system 1 transmits control target information to the energy supply facility 300 arranged in a target area. The target area is, for example, an area in which the energy supply facility 300 and the energy supply destination facility 600 are arranged in various places.

[0016] The energy management device 100 is an information processing device that acquires information via a communication network and performs various processes. The energy management device 100 includes, for example, a long-cycle processing unit 110, a medium-cycle processing unit 120, and a short-cycle processing unit 130. The long-cycle processing unit 110, the medium-cycle processing unit 120, and the short-cycle processing unit 130 are realized by a computer such as a CPU (Central Processing Unit) executing an energy management program stored in a program memory. Note that the long-cycle processing unit 110, the medium-cycle processing unit 120, and the short-cycle processing unit 130 are included in the energy management device 100, but are not limited to this, and may be distributed and arranged in multiple devices included in the energy management system 1.

[0017] The long-period processing unit 110 calculates energy demand forecast information for the target area, and calculates an energy purchase plan, a sales plan, and an energy storage plan by performing a mathematical optimization calculation for minimizing operation costs based on the calculated energy demand forecast information, the equipment model, and the equipment characteristic information. The mathematical optimization calculation is a calculation for selecting a solution from a domain in which an objective function is minimized (or maximized) or minimized (or maximized). A solution method for the mathematical optimization calculation may be freely selected depending on the problem, and may be, for example, a simplex method, an active constraint method, an interior point method, a Tabu search, a genetic algorithm, or a steepest descent method. The energy in the embodiment includes, for example, fuel, electric power, and heat of a medium. The medium is, for example, a medium circulated in the energy supply facility 300, such as steam, hot water, or cold water. The energy in the embodiment is not limited to electric power and fuel, and may be other energy such as hydrogen or ammonia. The energy demand forecast information is, for example, information including a predicted value of energy demand in one minute in one day. The energy purchase plan is, for example, information indicating the amount of energy purchased in 10-30 minute increments in a day. The energy sales plan is, for example, information indicating the amount of energy sold in 10-30 minute increments in a day. The energy storage plan such as the heat storage plan is, for example, information indicating the amount of energy stored in the energy supply facility 300 in 10-30 minute increments in a day.

[0018] The medium-cycle processing unit 120 calculates start and stop plans for multiple devices included in the energy supply facility 300 by performing mathematical optimization calculations aimed at minimizing operation costs based on the energy demand forecast information calculated by the long-cycle processing unit 110, the energy purchase plan, sales plan, energy storage plan, facility model, and facility characteristic information. The start and stop plan is information including the start and stop timings of each device included in the energy supply facility 300 on a minute-by-minute basis, for example.

[0019] The short-cycle processing unit 130 calculates control target information in accordance with the energy storage plan calculated by the long-cycle processing unit 110 and the activation / deactivation plan calculated by the medium-cycle processing unit 120. The short-cycle processing unit 130 may output the calculated control target information to the operator terminal device 200. In this way, the short-cycle processing unit 130 can cause the operator terminal device 200 to display the control target information. The short-cycle processing unit 130 can output the calculated control target information to equipment included in the energy supply facility 300 to control the equipment.

[0020] The short-cycle processing unit 130 outputs control target information to the devices included in the energy supply facility 300, and changes the control target information of each device according to the start-up and shutdown plan based on feedback information from the energy supply facility 300. The short-cycle processing unit 130 outputs the control target information of the devices at intervals of, for example, several tens of seconds, and changes the control target information of the devices. The feedback information is, for example, the operating state of the devices included in the energy supply facility 300, and sensor values ​​such as the energy amount and flow rate of the medium circulating in the energy supply facility 300. The short-cycle processing unit 130 outputs control target information that controls the operating state of the devices and the energy amount and flow rate of the medium based on the feedback information while satisfying the energy storage plan and following the start-up and shutdown plan. The feedback information may be an unexpected request from the energy supply destination facility 600. In response to the unexpected request from the energy supply destination facility 600, the short-cycle processing unit 130 changes the control target information of each device according to the start-up and shutdown plan so as to satisfy the request.

[0021] The short cycle processing unit 130 notifies the operator terminal device 200 of the feedback information, information indicating a change in the control target information of each device according to the activation / shutdown plan, and information indicating a change in the control target information of each device according to the feedback information.

[0022] The operator terminal device 200 is an information processing device operated by an operator in the target area. The operator terminal device 200 receives notification information including feedback information, information indicating a change in control target information of each device according to the activation / shutdown plan, and information indicating a change in control target information of each device according to the feedback information. The operator terminal device 200 performs display based on the notification information. In response to receiving an operation from the operator, the operator terminal device 200 transmits control instruction information for the devices included in the energy supply facility 300 to the energy management device 100. The short-cycle processing unit 130 controls the devices included in the energy supply facility 300 in accordance with the control instruction information.

[0023] The energy supply facility 300 supplies energy to the energy supply destination facility 600. The devices included in the energy supply facility 300 are, for example, a boiler 302, a cogeneration system (CGS) 304, a cooling tower 306, an absorption chiller 308, a turbo chiller 310, a heat dissipation heat exchanger 312, a heat storage tank 314, and medium transfer devices such as pumps and valves associated with these devices. In this embodiment, the devices included in the energy supply facility 300 generate energy using power supplied from a power supply facility 400 and / or fuel supplied from a fuel supply facility 500. For example, the boiler 302 and the CGS 304 are heating devices that heat a medium. For example, the cooling tower 306, the absorption chiller 308, the turbo chiller 310, and the heat dissipation heat exchanger 312 are cooling devices that cool a medium. The energy supply facility 300 has a control device for controlling the output of each device. The control device may include, for example, an output control device dedicated to the device, a centralized control device called a central monitoring device, a control terminal such as a distributed control system (DCS) or a programmable control system (PLC). The energy management device 100 transmits control target information to the control device of the energy supply facility 300 and changes the operation of the device.

[0024] The power supply facility 400 supplies power to the energy supply facility 300. The fuel supply facility 500 supplies fuel to the energy supply facility 300.

[0025] The energy supply destination facility 600 is a consumer facility that consumes the energy supplied from the energy supply facility 300. The energy supply destination facility 600 is, for example, a building facility located in a target area.

[0026] FIG. 2 is a diagram showing an example of the flow of operations of the energy management system 1 in the embodiment, and FIG. 3 is a diagram showing an example of the operation contents of the energy management system 1 in the embodiment.

[0027] The long-cycle processing unit 110 calculates an operation plan for the heat storage tank 314 and a power selling or purchasing plan for the power, for example, in a calculation cycle of one day (next day) (steps S100, S100A). The operation plan for the heat storage tank 314 indicates a target value for the amount of heat stored in the heat storage tank 314, for example, in a time granularity of 10 to 30 minutes, and the power selling or purchasing plan indicates a target value for the amount of power sold and the amount of power purchased, for example, in a time granularity of 30 minutes. The long-cycle processing unit 110 notifies (gives guidance) the operator terminal device 200 of the target value for the amount of heat stored, and the target values ​​for the amount of power sold and the amount of power purchased for the next day (step S100A).

[0028] The medium cycle processing unit 120 calculates, for example, at a calculation cycle of 30 minutes, a plan for the heat quantity and flow rate of the turbo chiller 310 and the heat dissipation heat exchanger 312, a plan for the bypass flow rate, and a start / stop plan for the absorption chiller 308 (step S200). The medium cycle processing unit 120 determines, for example, at a time granularity of one minute, the target values ​​for the heat quantity and flow rate of the turbo chiller 310 and the heat dissipation heat exchanger 312, the target value for the bypass flow rate, and the start / stop state of the absorption chiller 308, and notifies (gives guidance) to the operator terminal device 200 (step S200A).

[0029] The short-cycle processing unit 130 controls the heat quantity and flow rate of the turbo chiller 310 and the heat dissipation heat exchanger 312, and the bypass flow rate, as well as the start and stop of the absorption chiller 308, at a calculation cycle of, for example, 10 seconds (step S300). The short-cycle processing unit 130 provides control and guidance for changing the settings of the temperature, flow rate, etc. immediately before the start and stop operations of the absorption chiller 308 and the turbo chiller 310. The short-cycle processing unit 130 also increases or decreases the control target value of the flow rate in response to unpredictable changes in flow rate demand.

[0030] FIG. 4 is a diagram showing an example of a heat storage plan calculated by the long-period processing in the embodiment. An example of a heat storage plan is as follows: The amount of heat stored in heat storage tank 314 is increased by storing heat in heat storage tank 314 from T1 on one day (e.g., 22:00 on that day). As the amount of heat storage may be reduced at T2 (e.g., 8:00) the following day, turbo chiller 310 is stopped and heat storage tank 314 is switched to heat dissipation. If the amount of heat dissipation is adjusted to be higher during periods of high demand from T2 onwards, the amount of heat stored in heat storage tank 314 will decrease. With such a heat storage plan, the amount of heat stored and the amount of heat dissipated in heat storage tank 314 can be determined.

[0031] The long-cycle processing unit 110 calculates a heat storage plan for the heat storage tank 314. The medium-cycle processing unit 120 calculates a start / stop plan for the heating device or the cooling device based on the heat storage plan for the heat storage tank 314. The short-cycle processing unit 130 controls the start / stop of the heating device or the cooling device based on the start / stop plan calculated by the medium-cycle processing unit 120, and changes and changes the control target information and settings of the heating device or the cooling device in a short cycle according to the detection value and the demand value of the medium heat amount and the medium flow rate as feedback information. Here, the start / stop cycle of the heating device or the cooling device in the medium-cycle processing unit 120 is longer than the control cycle in the short-cycle processing unit 130. Note that the medium heat amount in the embodiment is an example of the amount of energy possessed by the medium, and the medium heat amount may be read as the medium energy amount.

[0032] 5 is a diagram showing an example of the heat storage amount of the heat storage tank 314, the medium flow rate of the heat dissipation heat exchanger 312, the bypass flow rate flowing in the bypass system circulated within the energy supply source facility, the supply and demand balance of flow rates, and chilled water demand forecast based on the start and stop plan determined by the medium cycle processing in the embodiment. The medium cycle processing unit 120 determines the steam heat amount output from the boiler 302 and the CGS 304, the medium flow rate of the absorption chiller 308, the medium flow rate of the turbo chiller 310, etc., based on the energy demand forecast information for the target area calculated by the long cycle processing unit 110, for a calculation period of, for example, three hours.

[0033] The medium cycle processing unit 120 determines to increase the bypass flow rate between time T10 and T12, thereby increasing the flow rate in the absorption chiller 308-1 (AR) and the flow rate in the absorption chiller 308-2 (AR). The medium cycle processing unit 120 determines to increase the flow rate of the heat dissipation heat exchanger 312 and reduce the bypass flow rate in response to the energy demand forecast increasing at time T12. The medium cycle processing unit 120 determines to decrease the flow rate of the heat dissipation heat exchanger 312 and increase the bypass flow rate in response to the energy demand forecast decreasing at time T14. After that, the medium cycle processing unit 120 determines to stop the absorption chiller 308-1 (AR) and the absorption chiller 308-2 (AR). In this way, the medium cycle processing unit 120 calculates a plan of the medium heat amount and medium flow rate supplied by the equipment included in the energy supply facility 300 using a mathematical optimization calculation aimed at minimizing the operation cost.

[0034] The short cycle processing unit 130 changes the settings of the devices included in the energy supply facility 300 according to the plans of the medium heat amount and medium flow rate calculated by the medium cycle processing unit 120. The short cycle processing unit 130 outputs control target information to the devices included in the energy supply facility 300 according to the heat storage plan calculated by the long cycle processing unit 110 and the start / stop plan, the medium heat amount, and the medium flow rate calculated by the medium cycle processing unit 120. At this time, the short cycle processing unit 130 changes the control target information of the devices included in the energy supply facility 300 according to the start / stop plan, the medium heat amount, and the medium flow rate calculated by the medium cycle processing unit 120, based on feedback information including the detection values ​​of the temperature sensor T, the flow rate sensor F, the differential pressure sensor ΔP, etc. (see FIG. 7). In addition, the short cycle processing unit 130 changes the cold water heat amount of the absorption chiller 308, the cold water heat amount of the turbo chiller 310, the cold water heat amount of the heat dissipation heat exchanger 312, and the heat release amount or heat storage amount of the heat storage tank 314 according to changes in demand of the energy supply destination facility 600.

[0035] FIG. 6 is a diagram showing an example of optimization process 100# in the energy management device 100 in the embodiment. The optimization process 100# is included in a long-period process performed in the long-period processing unit 110, a medium-period process performed in the medium-period processing unit 120, and a short-period process performed in the short-period processing unit 130. The optimization process 100# includes a plurality of processes corresponding to the configuration of the energy supply facility 300, and information is exchanged between the processes corresponding to the connection relationship of the devices included in the energy supply facility 300. Therefore, the optimization process 100# has a different configuration depending on the devices included in the energy supply facility 300 and the connection relationship of the devices included in the energy supply facility 300. FIG. 6 shows the optimization process 100# in the case where the energy supply facility 300 includes a boiler 302, a CGS 304, two absorption chillers 308, a turbo chiller 310, and a heat storage tank 314.

[0036] The optimization process 100# shown in FIG. 6 includes, for example, a boiler characteristic process 140, a CGS characteristic process 142, absorption chiller characteristic processes 144A and 144B, a turbo chiller characteristic process 148, an addition process 150, and a multiplication process 152. The boiler characteristic process 140 inputs fuel usage information, and outputs steam calorific value information based on the characteristics of the boiler 302. The CGS characteristic process 142 inputs fuel usage information, and outputs steam calorific value information, hot water calorific value information (not shown), and electricity sales amount information based on the characteristics of the CGS 304. The addition process 150a outputs steam calorific value information obtained by adding the steam calorific value information output from the boiler characteristic process 140 and the steam calorific value information output from the CGS characteristic process 142. The absorption chiller characteristic processes 144A and 144B input steam calorific value information from the addition process 150a, and output chilled water calorific value information and auxiliary power information based on the characteristics of the absorption chiller 308. The centrifugal chiller characteristic processing 148 inputs power amount information based on the power selling or purchasing plan determined by the long-period processing unit 110, and outputs chilled water heat amount information and auxiliary power information.

[0037] Addition processing 150b outputs heat quantity information obtained by adding heat release information (positive heat quantity information) or heat storage information (negative heat quantity information) based on the operation plan for heat storage tank 314 determined by long-period processing section 110 and chilled water heat quantity information output from turbo chiller characteristic processing 148. Addition processing 150c outputs heat quantity information obtained by adding chilled water heat quantity information output from absorption chiller characteristic processing 144A, 144B and heat quantity information output from addition processing 150b. The chilled water heat quantity output from addition processing 150c corresponds to chilled water heat demand.

[0038] Addition processing 150d outputs auxiliary power information obtained by adding the auxiliary power information output from absorption chiller characteristic processing 144A, 144B and the auxiliary power information output from turbo chiller characteristic processing 148. Addition processing 150e outputs power amount information obtained by adding the auxiliary power information output from addition processing 150d and power amount information based on the power selling or purchasing plan determined by long-period processing unit 110.

[0039] The power information output from the addition process 150e is output to the addition process 150f as cost information multiplied by the metered rate by the multiplication process 152c. The fuel usage information is output to the addition process 150f as cost information multiplied by the fuel unit price by the multiplication process 152a. The power sales amount information output from the CGS characteristic process 142 is output to the addition process 150f as cost information multiplied by the power sales unit price by the multiplication process 152b. The addition process 150f outputs operating cost information obtained by adding together the cost information output from the multiplication processes 152a, 152b, and 152c.

[0040] The fuel usage information is multiplied by a CO2 (carbon dioxide) emission coefficient by multiplication process 152d. Power amount information based on the power selling or purchasing plan determined by the long-period processing unit 110 is multiplied by a CO2 emission coefficient by multiplication process 152e. The output of multiplication process 152d and the output of multiplication process 152e are added by addition process 150g and output as CO2 emission information. The CO2 emission information is one of the constraints when the energy supply facility 300 operates.

[0041] The operating cost information is an objective function that is adjusted to be minimized in the long-cycle processing unit 110 and the medium-cycle processing unit 120. A target value is set for the operating cost information. The long-cycle processing unit 110 may calculate a power selling or purchasing plan to minimize the operating cost, which is the total of the power cost or fuel cost consumed in a target area that includes at least the power (auxiliary power) consumed by the heating device or cooling device. The medium-cycle processing unit 120 calculates a start / stop plan for the heating device or cooling device and the heat quantity and flow rate of the medium according to the target value of the power cost or fuel cost calculated by the long-cycle processing unit 110.

[0042] It is desirable for the long-cycle processing unit 110, the medium-cycle processing unit 120, or the short-cycle processing unit 130 to perform calculations to minimize the sum of all costs, including power costs and fuel costs, in the target area. For example, the long-cycle processing unit 110 calculates an energy purchase plan, a sales plan, and a heat storage plan so as to minimize the sum of all costs, including power costs and fuel costs, in the target area. The medium-cycle processing unit 120 calculates a start-up / stop plan so as to minimize the sum of all costs, including power costs and fuel costs, in the target area. The short-cycle processing unit 130 changes the control target information of the equipment so as to minimize the sum of all costs, including power costs and fuel costs, in the target area.

[0043] Each of the long-cycle processing unit 110, the medium-cycle processing unit 120, and the short-cycle processing unit 130 may perform an optimization calculation to minimize the fuel cost, the power cost, and the carbon dioxide emission in the target area in combination. The optimization calculation to minimize the CO2 emission by combining and minimizing the fuel cost, the power cost, and the carbon dioxide emission in the target area may be performed by at least one of the long-cycle processing unit 110, the medium-cycle processing unit 120, and the short-cycle processing unit 130. For example, the long-cycle processing unit 110 calculates an energy purchase plan, a sales plan, and a heat storage plan so as to minimize the fuel cost, the power cost, and the carbon dioxide emission in the target area in combination. The medium-cycle processing unit 120 calculates a start-up / shutdown plan so as to minimize the fuel cost, the power cost, and the carbon dioxide emission in the target area in combination. The short-cycle processing unit 130 changes the control target information of the equipment so as to minimize the fuel cost, the power cost, and the carbon dioxide emission in the target area in combination.

[0044] Each of the long-cycle processing unit 110, the medium-cycle processing unit 120, and the short-cycle processing unit 130 may perform an optimization calculation to minimize the total amount of consumed energy in the target area. The consumed energy amount includes, for example, the power consumption amount of the devices included in the energy supply facility 300 and the devices included in the energy supply destination facility 600, the amount of consumed fuel, and other amounts of consumed energy.

[0045] FIG. 7 is a diagram showing an example of a configuration of the energy supply facility 300 according to the embodiment. The energy supply facility 300 operates based on the processing result in the energy management device 100 shown in Fig. 4. The energy supply facility 300 includes, for example, two absorption chillers 308-1 and 308-2 and a heat dissipation heat exchanger 312. The two absorption chillers 308-1 and 308-2 are supplied with steam or hot water from the boiler 302 and the CGS 304, and supply cold water to the energy supply destination facility 600. The heat dissipation heat exchanger 312 is supplied with cold water from the cooling tower 306, the turbo chiller 310, and the heat storage tank 314, and supplies cold water to the energy supply destination facility 600.

[0046] Each of the absorption chillers 308-1, 308-2 and the heat dissipation heat exchanger 312 is connected to the energy destination facility 600 via a medium supply flow path to the energy destination facility 600 and a medium discharge flow path from the energy destination facility 600. Each of the absorption chillers 308-1, 308-2 and the heat dissipation heat exchanger 312 supplies cold water (medium) to the medium supply flow path via flow rate adjustment pumps 308a, 312a. A bypass flow path that bypasses the energy destination facility 600 is connected between the medium supply flow path and the medium discharge flow path. The energy destination facility 600 includes, for example, a cold water demand unit 602 and a control valve 604. Although only one energy destination facility 600 is illustrated in FIG. 4, the present invention is not limited to this, and multiple energy destination facilities 600 may be connected. The chilled water that has passed through the energy supply destination facility 600 or the bypass flow path is returned to the heat dissipation heat exchanger 312 and the absorption chillers 308-1 and 308-2 via a medium discharge flow path.

[0047] The temperature of the chilled water flowing from the absorption chillers 308-1 and 308-2 to the medium supply flow passage is detected by a temperature sensor. The chilled water flow rate in the bypass flow passage and the chilled water flow rate returned from the medium discharge flow passage to the heat dissipation heat exchanger 312 and the absorption chillers 308-1 and 308-2 are detected by a flow rate sensor F. The pressure difference between the chilled water pressure in the medium supply flow passage and the chilled water pressure in the medium discharge flow passage is detected by a differential pressure sensor ΔP.

[0048] The energy supply facility 300 further includes chilled water flow rate setting units 320 and 324, chilled water flow rate control units 322 and 326, a differential pressure setting unit 328, and a supply differential pressure control unit 330. The chilled water flow rate setting units 320 and 324 set the chilled water flow rates supplied to the medium supply flow path from the absorption chillers 308-1 and 308-2 and the heat dissipation heat exchanger 312 based on the heat quantity information acquired from the energy management device 100. The chilled water flow rate setting units 320 and 324 change the operation of the absorption chillers 308-1 and 308-2 and the heat dissipation heat exchanger 312 by acquiring the setting values ​​from the energy management device 100. The chilled water flow rate control units 322 and 326 control the flow rate adjustment pumps 308a and 312a based on the chilled water flow rates set by the chilled water flow rate setting units 320 and 324.

[0049] The differential pressure setting unit 328 sets the differential pressure between the medium supply flow path and the medium discharge flow path. The supply differential pressure control unit 330 controls the differential pressure between the medium supply flow path and the medium discharge flow path by controlling an adjustment valve provided in the bypass flow path based on the detection value of the differential pressure sensor ΔP and the differential pressure set by the differential pressure setting unit 328.

[0050] FIG. 8 is a diagram showing an example of the arrangement of energy supply facilities 300 and energy supply destination facilities 600 in a target area according to the embodiment. The energy supply facility 300 and the energy destination facility 600 are disposed at separate locations in the target area. The energy supply facilities 300-1, 300-2, 300-3, 300-4, and 300-5 and the energy destination facilities 600-1, 600-2, 600-3, 600-4, and 600-5 are connected to each other by piping 700 for flowing a medium (steam, hot water, cold water) and flow control devices 702 such as on-off valves, adjustment valves, and pumps.

[0051] The medium-cycle processing unit 120 may calculate a flow rate plan including the medium flow rates at each point, such as a branch point and a junction point of the piping in the target area, and the medium flow rates between the energy supply facilities 300 in the target area. The short-cycle processing unit 130 changes the settings of each flow control device 702 that controls the flow rates at each point based on the flow rate plan calculated by the medium-cycle processing unit 120.

[0052] As described above, the energy management system 1 of the embodiment includes the long-cycle processing unit 110 that calculates an energy purchase plan, a sales plan, and an energy storage plan based on energy demand forecast information, the medium-cycle processing unit 120 that calculates a start / stop plan for equipment included in the energy supply facility according to the energy demand forecast information and the energy purchase plan, the sales plan, and the energy storage plan, and the short-cycle processing unit 130 that controls equipment according to the energy storage plan calculated by the long-cycle processing unit 110 and the start / stop plan calculated by the medium-cycle processing unit 120, and changes control of each equipment according to the start / stop plan based on feedback information from the energy supply facility 300. This energy management system 1 makes it possible to maintain a stable supply to a target area while managing many types of energy in an advanced manner to improve economic efficiency or environmental friendliness, or to improve both economic efficiency and environmental friendliness.

[0053] Moreover, according to the energy management system 1, even if the energy supply facility 300 and the energy supply destination facility 600 are connected in a complex manner, the operator's labor costs, the costs of electricity, fuel, etc., and the combined costs of these can be reduced by optimizing the plan. That is, the energy management system 1 uses the long-cycle processing unit 110 to create an energy purchase plan, a sales plan, and an energy storage plan for a wide variety of energy supply facilities 300, uses the medium-cycle processing unit 120 to create a start / stop plan, and uses the short-cycle processing unit 130 to optimize the plan through feedback control in actual operation, thereby reducing the burden on the operator. Furthermore, the energy management system 1 enables the reduction in the number of operators or the implementation of an unmanned system, which can result in a reduction in operation costs.

[0054] Although each embodiment and each variant have been described, these are merely examples and are not intended to be limiting. For example, any of the embodiments or variants, or a part of each embodiment or a part of each variant, may be combined with one or more other embodiments or one or more other variants to realize one aspect of the present invention. [Explanation of symbols]

[0055] 1...energy management system, 100...energy management device, 110...long-period processing unit, 120...medium-period processing unit, 130...short-period processing unit, 140...boiler characteristic processing, 142...CGS characteristic processing, 144A, 144B...absorption chiller characteristic processing, 148...turbo chiller characteristic processing, 150a, 150b, 150c, 150d, 150e, 150f, 150g...addition processing, 152a, 152b, 152c, 152d, 152e...multiplication processing, 200... operator terminal device, 302... boiler, 304... CGS, 306... cooling tower, 308... absorption chiller, 308a... flow rate adjustment pump, 310... turbo chiller, 312... heat dissipation heat exchanger, 312a... flow rate adjustment pump, 314... heat storage tank, 320, 324... chilled water flow rate setting unit, 322, 326... chilled water flow rate control unit, 328... differential pressure setting unit, 330... supply differential pressure control unit, 602... chilled water demand unit, 604... control valve, 700... piping, 702... flow rate control device

Claims

1. An energy management system for controlling energy supply equipment arranged in a target area, A long-period processing unit that calculates energy demand forecast information for the target area and calculates an energy purchase plan, a sales plan, and an energy storage plan based on the calculated energy demand forecast information; a medium-term processing unit that calculates a start / stop plan for devices included in the energy supply facility according to the energy demand forecast information calculated by the long-term processing unit and the energy purchase plan, sales plan, and energy storage plan; a short-period processing unit that calculates control target information in accordance with the energy storage plan calculated by the long-period processing unit and the startup / shutdown plan calculated by the medium-period processing unit; An energy management system equipped with:

2. The energy management system according to claim 1 , wherein the short-cycle processing unit transmits the calculated control target information to an operator terminal device.

3. The energy management system according to claim 1 , wherein the short-cycle processing unit transmits the calculated control target information to the device.

4. The energy management system according to claim 1 , wherein the short-cycle processing unit changes the control target information of each device according to the activation / shutdown plan based on feedback information from the energy supply facility.

5. 5. The energy management system according to claim 4, wherein the short-cycle processing unit transmits to an operator terminal device the feedback information, information indicating a change in the control target information of each device in accordance with the start-up and shutdown plan, and information indicating a change in the control target information of each device in accordance with the feedback information.

6. The long-period processing unit calculates a heat storage plan of a heat storage tank included in the energy supply facility as the energy storage plan, The medium-cycle processing unit calculates a start / stop plan for a heating device or a cooling device included in the energy supply facility based on a heat storage plan for the heat storage tank, The short cycle processing unit includes: Controlling start or stop of the heating device or the cooling device based on the start / stop plan calculated by the medium cycle processing unit; changing and changing the control target information of the heating device or the cooling device in a short cycle according to the detection values ​​and demand values ​​of the medium energy amount and medium flow rate supplied by the equipment included in the energy supply facility as the feedback information; a start / stop cycle of the heating device or the cooling device is longer than a control cycle of the short cycle processing unit; The energy management system according to claim 4.

7. The medium cycle processing unit calculates a plan for a medium energy amount and a medium flow rate supplied by a device included in the energy supply facility, The short cycle processing unit changes settings of devices included in the energy supply facility in accordance with the plan of the medium energy amount and the medium flow rate calculated by the medium cycle processing unit. The energy management system of claim 1 .

8. The medium-cycle processing unit calculates a plan of a medium energy amount and a medium flow rate at each point in the target area, The short cycle processing unit changes the control target information and the settings of each flow control device that controls the flow rate at each point based on the medium energy amount and the medium flow rate plan calculated by the medium cycle processing unit. The energy management system of claim 1 .

9. The long-period processing unit calculates a power selling or purchasing plan according to a target value of the power cost or fuel cost consumed in the target area, the target value including the power consumed by at least a heating device or a cooling device included in the energy supply facility; The medium-cycle processing unit calculates a start / stop plan for the heating device or the cooling device and a heat amount and a flow rate of a medium according to the target value of the power cost or the fuel cost. The energy management system of claim 1 .

10. 2. The energy management system according to claim 1, wherein the long-cycle processing unit, the medium-cycle processing unit, or the short-cycle processing unit performs an optimization calculation to minimize the combined cost of electricity and fuel in the target area, or to minimize a combination of fuel cost, electricity cost, and carbon dioxide emission amount in the target area.

11. The energy management system according to claim 1 , wherein the long-cycle processing unit, the medium-cycle processing unit, or the short-cycle processing unit performs an optimization calculation to minimize a total amount of energy consumption in the target area.

12. Computer, a long-period processing unit that calculates energy demand forecast information for a target area, and calculates an energy purchase plan, a sales plan, and an energy storage plan based on the calculated energy demand forecast information; a medium-period processing unit that calculates a start / stop plan for devices included in an energy supply facility arranged in the target area according to the energy demand forecast information calculated by the long-period processing unit and the energy purchase plan, sales plan, and energy storage plan; a short-period processing unit that calculates control target information in accordance with the energy storage plan calculated by the long-period processing unit and the start-up / shutdown plan calculated by the medium-period processing unit; This is an energy management program that functions as a

13. An energy management method for controlling energy supply equipment arranged in a target area, comprising: An energy management system calculates energy demand forecast information for the target area, and calculates an energy purchase plan, a sales plan, and an energy storage plan based on the calculated energy demand forecast information; A step in which the energy management system calculates a start / stop plan for devices included in the energy supply facility according to the calculated energy demand forecast information, the energy purchase plan, the sales plan, and the energy storage plan; A step of the energy management system calculating control target information according to the calculated energy storage plan and the calculated startup / shutdown plan; An energy management method comprising:

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