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 Art

[0002] Conventionally, as a technology for managing electric power in a region, for example, the following Patent Document 1 is known. The power management system described in Patent Document 1 has a first power management device (CEMS) provided in a predetermined area communicate with each customer-side device existing in the predetermined area, and predicts the power supply-demand balance in the predetermined area. The first power management device calculates surplus power from the prediction result of the supply-demand balance, and prompts each customer to consume the surplus power. Thereby, the power management system preferentially consumes the power generated in the predetermined area within the area.

[0003] Further, the power management system includes 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 performs feedback control on, for example, PV and storage batteries in a short cycle (for example, in seconds). The medium-cycle real-time feedback control function monitors and performs feedback control on a device such as a heat accumulator in a medium cycle (for example, in hours). The long-cycle prediction function predicts the power generation amount, power demand, inter-system connection amount, etc. of each distributed power source in the region in a long cycle (for example, in units of several hours).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] A regional Energy Management System (EMS) collects and stores energy-related data from a group of buildings that receive energy in a region or other area, and supports energy operation through data analysis, including prediction, optimal planning, and optimal control. In a regional EMS, the energy that needs to be managed in the region is not limited to electricity, but includes various types of energy such as fuel energy and thermal energy. A regional EMS needs to manage the supply of these various types of energy and supply energy from each energy supply facility to each energy recipient facility. However, the power management system described in Patent Document 1 predicts the amount of power generated and the power demand of each distributed power source in the region over a long period and performs feedback control over a medium and short period, and is not able to handle the management of various types of energy.

[0006] Furthermore, when energy is shared and utilized within a region, the type and efficiency of energy supplied by each energy supply facility differ, and the requirements for the type and amount of energy consumed by the energy recipient facilities (flow rate, supply differential pressure, temperature) may also differ. In addition, the locations of the energy supply facilities 300 and the energy recipient facilities are dispersed across buildings in different locations, and the management entities for these buildings and facilities may also differ. Thus, there are diverse energy supply and demand relationships among multiple buildings, and the energy supply facilities and energy recipient facilities are dispersed across the area, requiring sophisticated energy management. However, as energy management becomes more complex, there have been cases where equipment with poor energy generation efficiency or inefficient energy transport operations have been implemented.

[0007] Furthermore, in regional energy management systems (EMS), operators were responsible for planning the operation of energy supply equipment 300 and controlling the energy supply from energy supply equipment 300 to energy recipient equipment 600. However, even with a daily plan, if actual operation did not match demand, the operator's workload could increase.

[0008] This disclosure is made in view of these circumstances and aims to provide an energy management system, energy management program, and energy management method that can improve economic efficiency or environmental efficiency, or improve both economic efficiency and environmental efficiency, while maintaining a stable supply to the target area and highly manage various types of energy. [Means for solving the problem]

[0009] This disclosure has been made to solve the above-mentioned problems, and one aspect of this disclosure is an energy management system for controlling energy supply equipment located in a target area, comprising: 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-period processing unit that calculates a start-up and stop-down plan for equipment included in the energy supply equipment according to the energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan calculated by the long-period processing unit; and a short-period processing unit that calculates control target information according to the energy storage plan calculated by the long-period processing unit and the start-up and stop-down plan calculated by the medium-period processing unit.

[0010] Another aspect of this disclosure is a program that causes a computer to function as 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-up and stop-down plan for equipment included in energy supply facilities located in the target area according to the energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan calculated by the long-period processing unit; and a short-period processing unit that calculates control target information according to the energy storage plan calculated by the long-period processing unit and the start-up and stop-down plan calculated by the medium-period processing unit.

[0011] Another aspect of the present disclosure is an energy management method for controlling energy supply equipment located in a target area, comprising 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; an energy management system calculating a start-up and stop-down 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 an energy management system calculating a control target information in accordance with the calculated heat storage plan and the calculated start-up and stop-down plan. [Effects of the Invention]

[0012] According to one aspect of the present invention, various types of energy can be highly controlled for a target area. [Brief explanation of the drawing]

[0013] [Figure 1] This is a block diagram showing an example of an energy management system in an embodiment. [Figure 2] This figure shows an example of the operation flow of the energy management system in the embodiment. [Figure 3] This figure shows an example of the operation of the energy management system in the embodiment. [Figure 4] This figure shows an example of a heat storage plan calculated by long-period processing in the embodiment. [Figure 5] This figure shows an example of the heat storage capacity of the thermal storage tank, the fluid flow rate of the heat exchanger for heat dissipation, the bypass flow rate that flows through the bypass system circulating within the energy supply equipment, the supply and demand balance of the flow rate, and the chilled water demand forecast, based on the start-up and stop-down plan determined by the medium-cycle processing in the embodiment. [Figure 6]This figure shows an example of optimization processing in an energy management device according to an embodiment. [Figure 7] This figure shows an example of the configuration of an energy supply system in an embodiment. [Figure 8] This figure shows an example of the arrangement of energy supply equipment and energy supply destination equipment in the target area according to the embodiment. [Modes for carrying out the invention]

[0014] Hereinafter, an energy management system, an energy management program, and an energy management method to which the present invention is applied will be described with reference to the drawings.

[0015] Figure 1 is a block diagram showing an example of an energy management system 1 in an embodiment. The energy management system 1 includes, for example, an energy management device 100, an operator terminal device 200, energy supply equipment 300, power supply equipment 400, fuel supply equipment 500, and energy recipient equipment 600. The energy management device 100, operator terminal device 200, energy supply equipment 300, power supply equipment 400, fuel supply equipment 500, and energy recipient equipment 600 have a communication interface (not shown), such as a NIC (Network Interface Card) or 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 equipment 300 located in the target area. The target area is, for example, an area where energy supply equipment 300 and energy recipient equipment 600 are located 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, for example, 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 provided in the energy management device 100, but are not limited thereto, and may be distributed and arranged in a plurality of devices included in the energy management system 1.

[0017] The long-cycle processing unit 110 calculates energy demand prediction information for a target area, and performs mathematical optimization calculations aimed at minimizing operation costs based on the calculated energy demand prediction information, facility models, and facility characteristic information, thereby calculating an energy purchase plan, a sales plan, and an energy storage plan. Mathematical optimization calculation is a calculation for selecting a solution that minimizes (or maximizes) or minimizes (or maximizes) the objective function from the domain. The solution method of the mathematical optimization calculation may be freely selected according to the problem, and examples thereof include the simplex method, the active constraint method, the interior point method, tab search, genetic algorithm, and steepest descent method. The energy in the embodiment includes, for example, fuel, electric power, heat possessed by a medium, etc. The medium is, for example, a medium circulated in an 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 prediction information is, for example, information including predicted values of energy demand amounts in 1-minute units for one day. The energy purchase plan is, for example, information indicating the energy purchase amount in 10-30 minute units for one day. The energy sales plan is, for example, information indicating the energy sales amount in 10-30 minute units for one day. The energy storage plan such as a heat storage plan is, for example, information indicating the amount of stored energy in the energy supply facility 300 in 10-30 minute units for one day.

[0018] Based on the energy demand prediction information calculated by the long-term processing unit 110, the energy purchase plan, sales plan, energy storage plan, equipment model, and equipment characteristic information, the medium-term processing unit 120 calculates the startup and shutdown plan of a plurality of devices included in the energy supply facility 300 by performing mathematical optimization calculations aiming at minimizing the operation cost. The startup and shutdown plan is information including, for example, the startup timing and shutdown timing of each device included in the energy supply facility 300 in units of one minute.

[0019] The short-term processing unit 130 calculates control target information according to the energy storage plan calculated by the long-term processing unit 110 and the startup and shutdown plan calculated by the medium-term processing unit 120. The short-term processing unit 130 may output the calculated control target information to the operator terminal device 200. Thereby, the short-term processing unit 130 can cause the operator terminal device 200 to display the control target information. The short-term processing unit 130 outputs the calculated control target information to the devices included in the energy supply facility 300 and can control the devices.

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

[0021] The short-period processing unit 130 notifies the operator terminal device 200 of feedback information, information indicating changes to the control target information of each device in accordance with the start-up / stop-down plan, and information indicating changes to the control target information of each device in accordance with 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 changes to the control target information of each device in accordance with the start-up / shut-down plan, and information indicating changes to the control target information of each device in accordance with the feedback information. The operator terminal device 200 displays information based on the notification information. Upon receiving an operation from the operator, the operator terminal device 200 transmits control instruction information for the devices included in the energy supply equipment 300 to the energy management device 100. The short-period processing unit 130 controls the devices included in the energy supply equipment 300 according to the control instruction information.

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

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

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

[0026] Figure 2 shows an example of the operation flow of the energy management system 1 in the embodiment, and Figure 3 shows an example of the operation content of the energy management system 1 in the embodiment.

[0027] The long-period processing unit 110 calculates, for example, the operation plan for the heat storage tank 314 and the electricity sales or purchase plan with a calculation cycle of one day (the next day) (steps S100, S100A). The operation plan for the heat storage tank 314 indicates, for example, the target value of the heat storage amount of the heat storage tank 314 at a time granularity of 10 to 30 minutes, and the electricity sales or purchase plan indicates, for example, the target value of the amount of electricity sold and purchased at a time granularity of 30 minutes. The long-period processing unit 110 notifies (guidances) the operator terminal device 200 of the target value of the heat storage amount, the amount of electricity sold and the amount of electricity purchased for the next day (step S100A).

[0028] The intermediate cycle processing unit 120 calculates, for example, the heat quantity and flow rate plan for the turbo chiller 310 and the heat exchanger 312, the bypass flow rate plan, and the start-up and stop-down plan for the absorption chiller 308 with a calculation cycle of 30 minutes (step S200). The intermediate cycle processing unit 120 determines, for example, the target values ​​for the heat quantity and flow rate of the turbo chiller 310 and the heat exchanger 312, the target value for the bypass flow rate, and the start-up and stop-down state of the absorption chiller 308 with a time granularity of 1 minute, and notifies (guidance) the operator terminal device 200 (step S200A).

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

[0030] Figure 4 shows an example of a heat storage plan calculated by long-period processing in the embodiment. A thermal storage plan might look like this: From T1 (for example, 22:00 on the same day), heat is stored in the thermal storage tank 314 to increase its heat storage capacity. At T2 (for example, 8:00) on the following day, the amount of heat stored can be reduced, so the turbo chiller 310 is stopped and the thermal storage tank 314 is switched to heat release. If the heat release rate is adjusted to be higher during periods of high demand from T2 onward, the amount of heat stored in the thermal storage tank 314 will decrease. With such a thermal storage plan, the amount of heat stored and the amount of heat released by the thermal storage tank 314 can be determined.

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

[0032] Figure 5 shows an example of the heat storage capacity of the heat storage tank 314, the media flow rate of the heat dissipation heat exchanger 312, the bypass flow rate that flows through the bypass system circulating within the energy supply equipment, the supply and demand balance of the flow rate, and the chilled water demand forecast, based on the start-up and shutdown plan determined by the medium-period processing in the embodiment. The medium-period processing unit 120 determines, for example, the amount of steam heat output from the boiler 302 and CGS 304, the media flow rate of the absorption chiller 308, the media flow rate of the turbo chiller 310, etc., based on the energy demand forecast information for the target area calculated by the long-period processing unit 110, over a calculation period of 3 hours.

[0033] The intermediate cycle processing unit 120 decides to increase the flow rate in absorption chillers 308-1(AR) and 308-2(AR) by increasing the bypass flow rate between times T10 and T12. At time T12, the intermediate cycle processing unit 120 decides to increase the flow rate in the heat exchanger 312 and decrease the bypass flow rate in response to the rising energy demand forecast. At time T14, the intermediate cycle processing unit 120 decides to decrease the flow rate in the heat exchanger 312 and increase the bypass flow rate in response to the falling energy demand forecast. Subsequently, the intermediate cycle processing unit 120 decides to shut down absorption chillers 308-1(AR) and 308-2(AR). In this way, the intermediate cycle processing unit 120 calculates the planned amount of heat and flow rate of the medium supplied by the equipment included in the energy supply facility 300 using mathematical optimization calculations aimed at minimizing operating costs.

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

[0035] Figure 6 shows an example of the optimization process 100# in the energy management device 100 in the embodiment. The optimization process 100# includes long-period processing performed in the long-period processing unit 110, medium-period processing performed in the medium-period processing unit 120, and short-period processing performed in the short-period processing unit 130. The optimization process 100# includes multiple processes corresponding to the configuration of the energy supply equipment 300, and information is exchanged between processes in accordance with the connection relationships of the equipment included in the energy supply equipment 300. Therefore, the optimization process 100# will have different configurations depending on the equipment included in the energy supply equipment 300 and the connection relationships of the equipment included in the energy supply equipment 300. Figure 6 shows the optimization process 100# when the energy supply equipment 300 includes a boiler 302, a CGS 304, two absorption chillers 308, a turbo chiller 310, and a thermal storage tank 314.

[0036] The optimization process 100# shown in Figure 6 includes, for example, boiler characteristic processing 140, CGS characteristic processing 142, absorption chiller characteristic processing 144A, 144B, turbo chiller characteristic processing 148, addition processing 150, and multiplication processing 152. Boiler characteristic processing 140 takes fuel usage information as input and outputs steam heat quantity information based on the characteristics of boiler 302. CGS characteristic processing 142 takes fuel usage information as input and outputs steam heat quantity information, hot water heat quantity information (not shown), and electricity sales amount information based on the characteristics of CGS 304. Addition processing 150a outputs steam heat quantity information obtained by adding the steam heat quantity information output from boiler characteristic processing 140 and the steam heat quantity information output from CGS characteristic processing 142. Absorption chiller characteristic processing 144A and 144B take steam heat quantity information from addition processing 150a and output chilled water heat quantity information and auxiliary power information based on the characteristics of absorption chiller 308. The turbo chiller characteristic processing unit 148 receives power quantity information based on the power sales or purchase plan determined by the long-period processing unit 110, and outputs chilled water heat quantity information and auxiliary equipment power information.

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

[0038] The addition process 150d outputs auxiliary power information obtained by adding the auxiliary power information output from the absorption chiller characteristic processes 144A and 144B and the auxiliary power information output from the turbo chiller characteristic process 148. The addition process 150e outputs energy quantity information obtained by adding the auxiliary power information output from the addition process 150d and the energy quantity information based on the power sales or purchase plan determined by the long-period processing unit 110.

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

[0040] Fuel usage information is multiplied by the CO2 (carbon dioxide) emission factor by multiplication process 152d. Electricity amount information based on the electricity sales or purchase plan determined by the long-period processing unit 110 is multiplied by the CO2 emission factor by multiplication process 152e. The outputs of multiplication process 152d and multiplication process 152e are added together by addition process 150g and output as CO2 emission information. CO2 emission information is one of the constraints when the energy supply equipment 300 is operating.

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

[0042] The long-period processing unit 110, the medium-period processing unit 120, or the short-period processing unit 130 should ideally perform calculations to minimize the total cost, including electricity and fuel costs, in the target area. For example, the long-period processing unit 110 calculates energy purchase plans, sales plans, and thermal storage plans to minimize the total cost, including electricity and fuel costs, in the target area. The medium-period processing unit 120 calculates start-up and shutdown plans to minimize the total cost, including electricity and fuel costs, in the target area. The short-period processing unit 130 modifies the equipment control target information to minimize the total cost, including electricity and fuel costs, in the target area.

[0043] Each of the long-period processing unit 110, medium-period processing unit 120, or short-period processing unit 130 may perform an optimization calculation to minimize a combination of fuel costs, electricity costs, and carbon dioxide emissions in the target area. The optimization calculation to minimize CO2 emissions by combining fuel costs, electricity costs, and carbon dioxide emissions in the target area may be performed by at least one of the long-period processing unit 110, medium-period processing unit 120, and short-period processing unit 130. For example, the long-period processing unit 110 calculates an energy purchase plan, sales plan, and thermal storage plan to minimize a combination of fuel costs, electricity costs, and carbon dioxide emissions in the target area. The medium-period processing unit 120 calculates a start-up and shutdown plan to minimize a combination of fuel costs, electricity costs, and carbon dioxide emissions in the target area. The short-period processing unit 130 modifies the control target information of the equipment to minimize a combination of fuel costs, electricity costs, and carbon dioxide emissions in the target area.

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

[0045] Figure 7 shows an example of the configuration of the energy supply equipment 300 in the embodiment. The energy supply equipment 300 operates based on the processing results in the energy management device 100 shown in Figure 4. The energy supply equipment 300 includes, for example, two absorption chillers 308-1 and 308-2 and a heat exchanger 312. Steam or hot water is supplied to the two absorption chillers 308-1 and 308-2 from the boiler 302 and CGS 304, and chilled water is supplied to the energy supply destination equipment 600. Chilled water is supplied to the heat exchanger 312 from the cooling tower 306, turbo chiller 310, and thermal storage tank 314, and chilled water is supplied to the energy supply destination equipment 600.

[0046] Each of the absorption chillers 308-1 and 308-2, and the heat exchanger 312 for heat dissipation, are connected to the energy supply facility 600 via a medium supply channel to the energy supply facility 600 and a medium discharge channel from the energy supply facility 600. Each of the absorption chillers 308-1 and 308-2, and the heat exchanger 312 for heat dissipation, supplies chilled water (medium) to the medium supply channel via flow rate adjustment pumps 308a and 312a. A bypass channel is connected between the medium supply channel and the medium discharge channel to bypass the energy supply facility 600. The energy supply facility 600 includes, for example, a chilled water demand section 602 and a control valve 604. In Figure 4, only one energy supply facility 600 is shown, but it is not limited to this, and multiple energy supply facilities 600 may be connected. The chilled water that has passed through the energy supply equipment 600 or the bypass channel is returned to the heat exchanger 312 and the absorption chillers 308-1 and 308-2 via the medium discharge channel.

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

[0048] The energy supply equipment 300 further includes chilled water flow rate setting units 320 and 324, chilled water flow rate control units 322 and 326, differential pressure setting unit 328, and supply differential pressure control unit 330. The chilled water flow rate setting units 320 and 324 set the chilled water flow rate supplied from the absorption chillers 308-1 and 308-2 and the heat exchanger 312 to the medium supply channel based on 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 exchanger 312 by acquiring the set value 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 rate 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 channel and the medium discharge channel. The supply differential pressure control unit 330 controls the differential pressure between the medium supply channel and the medium discharge channel by controlling the control valve provided in the bypass channel based on the detected value of the differential pressure sensor ΔP and the differential pressure set by the differential pressure setting unit 328.

[0050] Figure 8 shows an example of the arrangement of energy supply equipment 300 and energy supply destination equipment 600 in the target area according to the embodiment. The energy supply equipment 300 and the energy recipient equipment 600 are located at different points within the target area. Multiple energy supply equipment 300-1, 300-2, 300-3, 300-4, and 300-5, and multiple energy recipient equipment 600-1, 600-2, 600-3, 600-4, and 600-5 are connected by piping 700 for carrying a medium (steam, hot water, chilled water), and flow control devices 702 such as on-off valves, control valves, and pumps.

[0051] The medium-period processing unit 120 may calculate a flow rate plan that includes the flow rate of the medium at each point in the target area, such as branching and merging points of the piping, and the flow rate of the medium between the energy supply equipment 300 in the target area. The short-period processing unit 130 changes the settings of each flow control device 702 that controls the flow rate at each point based on the flow rate plan calculated by the medium-period processing unit 120.

[0052] As described above, the energy management system 1 of this embodiment includes a long-period processing unit 110 that calculates an energy purchase plan, a sales plan, and an energy storage plan based on energy demand forecast information; a medium-period processing unit 120 that calculates a start-up and stop-down plan for equipment included in the energy supply facility according to the energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan; and a short-period processing unit 130 that controls the equipment according to the energy storage plan calculated by the long-period processing unit 110 and the start-up and stop-down plan calculated by the medium-period processing unit 120, and modifies the control of each piece of equipment according to the start-up and stop-down plan based on feedback information from the energy supply facility 300. With this energy management system 1, it is possible to highly manage various types of energy to improve economic efficiency or environmental efficiency, or to improve both economic efficiency and environmental efficiency, while maintaining a stable supply to the target area.

[0053] Furthermore, according to the energy management system 1, even if the energy supply equipment 300 and the energy supply destination equipment 600 are intricately connected, the optimization of the plan can reduce the costs of operator labor, electricity, fuel, etc., and the combined costs thereof. In other words, the energy management system 1 uses the long-period processing unit 110 to formulate energy purchase plans, sales plans, and energy storage plans for a wide variety of energy supply equipment 300, the medium-period processing unit 120 to formulate start-up and stop-down plans, and the short-period processing unit 130 to optimize through feedback control in actual operation, thereby reducing the burden on the operator. Moreover, according to the energy management system 1, it is possible to reduce or even automate the operation of the operator, which in turn leads to a reduction in operating costs.

[0054] Although various embodiments and modifications have been described, these are merely examples and are not limited to these. For example, one embodiment or modification, or a part of one embodiment or modification, may be combined with one or more other embodiments or modifications 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 control pump, 310…Turbo chiller, 312…Heat exchanger for heat dissipation, 312a…Flow rate control pump, 314…Thermal 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 that controls energy supply equipment located in a target area, A long-period processing unit 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-period processing unit calculates a start-up and stop-down plan for equipment included in the energy supply facility according to the energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan calculated by the long-period processing unit, A short-period processing unit calculates 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, An energy management system equipped with the following features.

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

4. The energy management system according to claim 1, wherein the short-period processing unit changes the control target information of each device in accordance with the start-up / stop-down plan based on feedback information from the energy supply equipment.

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

6. The long-period processing unit calculates the heat storage plan for the heat storage tank included in the energy supply equipment as the energy storage plan, The aforementioned intermediate cycle processing unit calculates a start-up / stop-down plan for the heating or cooling device included in the energy supply equipment based on the heat storage plan of the heat storage tank. The short-period processing unit is Based on the start / stop plan calculated by the aforementioned intermediate cycle processing unit, the start or stop of the heating device or the cooling device is controlled. The control target information and settings of the heating device or the cooling device are changed and set in short cycles according to the detected values ​​and demand values ​​of the amount of medium energy and medium flow rate supplied by the equipment included in the energy supply facility, which are considered as feedback information. The start-up / stop cycle of the heating device or the cooling device is longer than the control cycle of the short-period processing unit. The energy management system according to claim 4.

7. The aforementioned intermediate cycle processing unit calculates the plan for the amount of media energy and the flow rate of media supplied by the equipment included in the energy supply facility. The short-period processing unit modifies the settings of the equipment included in the energy supply facility according to the plan of the amount of medium energy and the flow rate calculated by the medium-period processing unit. The energy management system according to claim 1.

8. The aforementioned intermediate-period processing unit calculates the plan for the amount of media energy and the flow rate of media at each point in the target area. The short-period processing unit modifies the control target information and settings of each flow rate control device that controls the flow rate at each point based on the media energy amount and media flow rate plan calculated by the medium-period processing unit. The energy management system according to claim 1.

9. The long-period processing unit calculates a plan for selling or buying electricity according to a target value of the electricity cost or fuel cost consumed in the target area, including the electricity consumed by at least the heating or cooling equipment included in the energy supply facility. The aforementioned intermediate cycle processing unit calculates the start-up and stop-down plan for the heating device or the cooling device, as well as the heat quantity and flow rate of the medium, according to the target value of the power cost or fuel cost. The energy management system according to claim 1.

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

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

12. Computers, A long-period processing unit calculates energy demand forecast information for the target area and calculates energy purchase plans, sales plans, and energy storage plans based on the calculated energy demand forecast information. A medium-period processing unit calculates a start-up and stop-down plan for equipment included in the energy supply facilities located in the target area, in accordance with the energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan calculated by the long-period processing unit. A short-period processing unit calculates 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. An energy management program that functions as such.

13. An energy management method for controlling energy supply equipment located in a target area, The 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. The energy management system includes the steps of calculating a start-up and stop-down plan for equipment included in the energy supply facility in accordance with the calculated energy demand forecast information and the energy purchase plan, sales plan, and energy storage plan, The energy management system includes the step of calculating control target information according to the calculated energy storage plan and the calculated start-up / shutdown plan, Energy management methods including

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