Energy management system and method

Abstract

To generate a self-consignment plan that effectively utilizes energy including both electricity and heat.SOLUTION: An energy management system includes a consignment planning device, a power generation planning device, and a power transmission and reception planning device. The power generation planning device calculates the amount of power to be generated by a cogeneration system so that the amount of waste heat from the cogeneration system is used without excess or deficiency to satisfy the heat demand for each time slot in the planning period for a combined heat and power supplying site. The power transmission and reception planning device generates information on surplus and insufficient power for each time slot in the planning period for the combined heat and power supplying site and generates information on surplus and insufficient power for each time slot in the planning period for a plurality of sites excluding the combined heat and power supplying site. The consignment planning device acquires information on surplus and insufficient power at the plurality of sites and generates a self-consignment plan for each time period during the planning period so that power is self-consigned from sites with surplus power to sites with insufficient power.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to an energy management system and method for managing electrical and thermal energy for multiple sites and generating self-dispatch plans for electricity for the multiple sites. [Background technology]

[0002] A mechanism (hereinafter, self-dispatch system) is known in which electricity is transmitted from private power generation facilities to demand facilities located away from the facilities via a power transmission and distribution network managed by a power transmission and distribution business operator. Since a self-dispatch system uses a power transmission and distribution network, it is required to supply an amount of electricity equal to the planned value or the actual power demand in a given unit time, i.e., the same amount at the same time. A self-dispatch plan including planned values ​​of the power demand and supply per unit time is notified to the power distribution business operator in advance, and the power distribution business operator transmits the electricity received from the private power generation facilities to the demand facilities according to the self-dispatch plan.

[0003] Cogeneration systems are becoming popular as private power generation facilities. A cogeneration system is a general term for a system that produces and supplies electricity and heat from a heat source. There are three types of cogeneration systems: one that uses an internal combustion engine to generate electricity and utilizes the heat generated during the process, one that uses a fuel cell to generate electricity and utilizes the heat generated during the process, and one that uses a steam boiler and steam turbine to generate electricity and utilize part of the steam as heat. The heat generated by a cogeneration system, i.e., steam and hot water, is used in manufacturing processes, absorption chillers for air conditioning, or as a heat source for hot water supply.

[0004] Conventionally, cogeneration systems have been operated with an emphasis on cost. For example, Patent Document 1 describes switching the operation mode of a cogeneration system during a demand response period when a reduction in the power received from a commercial power grid is required, so that the system operates in a normal operation mode when the power selling price is equal to or lower than the power generation cost, and operates in a maximum output operation mode when the power selling price exceeds the power generation cost. In the normal operation mode, a power-dominated operation is performed in which the output is controlled so that the generated power follows the power consumption of the power load. In the maximum output operation mode, the generated power of the cogeneration system is set to the rated output regardless of the power consumption of the power load, and surplus power is sold by reverse power flow to the commercial power grid. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-50826 A Summary of the Invention [Problem to be solved by the invention]

[0006] When electricity generated by a cogeneration system at a first site is transmitted to a demand facility at a second site using a self-dispatch system, if electricity is exchanged between multiple sites to minimize the total cost, including generation and transmission, information is required to determine the costs, and the calculations to determine the costs are complicated.

[0007] The present disclosure has been made in consideration of the above circumstances, and its purpose is to provide an energy management system and method for generating a self-dispatch plan for a specified planning period consisting of a plurality of consecutive unit time periods, so as to enable more effective use of energy, including both electricity and heat, in a self-dispatch group consisting of a plurality of sites including at least one combined heat and power site equipped with a cogeneration system and capable of self-dispatch of electricity between the sites. [Means for solving the problem]

[0008] In order to solve the above problem, an energy management system according to one embodiment of the present disclosure includes: An energy management system for generating a self-dispatch plan for a predetermined planning period consisting of a plurality of consecutive unit time slots in a self-dispatch group that is composed of a plurality of sites including a first combined heat and power site having a first cogeneration system that performs a heat-dominant operation to adequately satisfy heat demand by exhaust heat, and that is capable of self-dispatch of electricity between the sites, comprising: The system includes a wheeling planning device, a power generation planning device, and a power transmission and reception planning device, the power generation planning device is configured to acquire a heat demand plan and an electric power demand plan for the first cogeneration site during the planning period, and to calculate an amount of power generation of the first cogeneration system such that the heat demand for each time period during the planning period is satisfied without excess or deficiency by the amount of exhaust heat of the first cogeneration system; the power transmission and reception planning device is configured to obtain surplus power and power shortage from a difference between the power generation amount and power demand in each time period of the planning period for the first cogeneration site, and generate information related to the surplus power and power shortage in each time period of the planning period; and to obtain a power demand plan for the planning period for the multiple sites excluding the first cogeneration site, and generate information related to the surplus power and power shortage in each time period of the planning period based on the power demand plan; The transmission planning device is configured to acquire information related to surplus power and power shortages of the multiple sites, determine a primary transmission source from among the first combined heat and power supply site for each time period of the planning period so that electricity is self-transferred from a site with surplus power to a site with a power shortage, and determine a primary transmission destination from among predetermined primary transmission destination candidates among the multiple sites, and generate the self-transmission plan including combinations of the primary transmission sources and the primary transmission destinations for each time period of the planning period and the amount of power transmitted from the primary transmission source to the primary transmission destination.

[0009] In order to solve the above problem, an energy management method according to one embodiment of the present disclosure includes: A self-dispatch group is a group of sites including a combined heat and power supply site equipped with a cogeneration system that performs heat-dominant operation to meet heat demand without excess or deficiency by exhaust heat, and capable of self-dispatch of electricity between the sites. The self-dispatch group is an energy management method in which a processor generates a self-dispatch plan for a predetermined planning period consisting of a plurality of consecutive unit time slots, obtaining a heat demand plan and an electric power demand plan for the planning period for the cogeneration site, and calculating an amount of power generated by the cogeneration system so that the heat demand for each time period of the planning period is satisfied without excess or deficiency by the exhaust heat amount of the cogeneration system; For the cogeneration site, determining surplus power and shortage power from the difference between the power generation amount and the power demand for each time period of the planning period, and generating information related to surplus power and shortage power for each time period of the planning period; acquiring a power demand plan for the planning period for the plurality of sites excluding the cogeneration site, and generating information on surplus power and shortage power for each time period of the planning period based on the power demand plan; The method includes acquiring information relating to surplus power and power shortages of the multiple sites, determining a transmission source from among the heat and power combined supply sites for each time period of the planning period so that electricity is self-transferred from a site having surplus power to a site having a power shortage, and determining a transmission destination from among predetermined transmission destination candidates among the multiple sites, and generating the self-transfer plan including combinations of the transmission sources and the transmission destinations for each time period of the planning period and the amount of electricity to be transmitted. Effect of the Invention

[0010] According to the present disclosure, an energy management system and method can be provided that generates a self-dispatch plan for a specified planning period consisting of a plurality of consecutive unit time periods, so as to enable more effective use of energy including both electricity and heat in a self-dispatch group consisting of a plurality of sites including at least one combined heat and power site equipped with a cogeneration system and capable of self-dispatch of electricity between the sites. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing an overall configuration of an energy management system according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a flowchart showing the generation of a power generation plan by the first power generation planning device. [Diagram 3] FIG. 3 is a chart showing an example of a power demand plan. [Figure 4] FIG. 4 is a chart showing an example of a heat demand plan. [Diagram 5] FIG. 5 is a chart showing an example of a power generation plan. [Figure 6] FIG. 6 is a chart showing an example of the relationship between the power generation plan and the power demand. [Figure 7] FIG. 7 is a flowchart showing the generation of a self-transportation plan by the transport planning device. [Figure 8] FIG. 8 is a diagram for explaining a method for formulating a self-transmission schedule. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, an embodiment of the present disclosure will be described with reference to the drawings. An energy management system (hereinafter referred to as EMS) according to the present disclosure generates a self-dispatch plan for self-dispatch of electricity between sites in a self-dispatch group consisting of multiple sites including one or more sites (hereinafter referred to as "combined heat and power supply sites") equipped with a cogeneration system (hereinafter referred to as CGS).

[0013] [Configuration of Energy Management System 1] FIG. 1 is a block diagram showing a configuration of an EMS 1 according to an embodiment of the present disclosure. The self-delivery group G shown in FIG. 1 is composed of a plurality of sites 100, 200, 300, 400, and can self-deliver electricity between any of the sites. The self-delivery group G according to this embodiment has four sites, but the number of sites is not limited. At least one of the plurality of sites 100, 200, 300, 400 is a cogeneration site equipped with a CGS. In the self-delivery group G according to this embodiment, the first to third sites 100, 200, 300 are cogeneration sites. The plurality of sites of the self-delivery group G may include, in addition to the cogeneration site, a site having no power generation capacity and equipped with an electric power demand facility 3, a site having a power generation facility that does not use heat, a site having a power generation facility that does not use heat and an electric power demand facility 3, and the like.

[0014] The EMS1 according to the present disclosure includes a wheeling planning device 9, power generation planning devices 101, 201, and 301 belonging to cogeneration sites 100, 200, and 300, and power transmission and reception planning devices 102, 202, 302, and 402 belonging to each site. Note that, although the EMS1 according to the present embodiment includes three power generation planning devices 101, 201, and 301, the number of the power generation planning devices is merely an example, and the number of the power generation planning devices may be one or more.

[0015] The consignment planning device 9, each of the power generation planning devices 101, 201, 301, and each of the power transmission and reception planning devices 102, 202, 302, 402 can be realized by an arithmetic processing device including, for example, a CPU (Central Processing Unit), a memory, an auxiliary storage device such as an HDD (Hard Disk Drive), a communication I / F for connecting to the communication network 7 and other devices by wire or wirelessly, an input device such as a mouse, a keyboard, a touch sensor, or a touch panel, and an output device such as a liquid crystal display. Each function of the consignment planning device 9, the power generation planning devices 101, 201, 301, and the power transmission and reception planning devices 102, 202, 302, 402 described later can be realized by loading a predetermined program stored in the auxiliary storage device into the memory and executing it with the CPU.

[0016] The wheeling planning device 9 and the multiple power transmission and reception planning devices 102, 202, 302, 402 can transmit and receive information to and from each other via a communication means such as a communication network 7 or satellite communication. The multiple power generation planning devices 101, 201, 301 belong to different sites 100, 200, 300. However, the functions of the multiple power generation planning devices 101, 201, 301 may be realized by one arithmetic processing device. In this case, a power generation planning circuit in one arithmetic processing device may generate a power generation plan, etc. for each cogeneration site. The multiple power transmission and reception planning devices 102, 202, 302, 402 belong to different sites 100, 200, 300, 400. However, the functions of the multiple power transmission and reception planning devices 102, 202, 302, 402 may be realized by one arithmetic processing device. In this case, a power transmission and reception planning circuit in one arithmetic processing device may generate a power transmission and reception plan, etc. for each site. The consignment planning device 9 may be located at any site, or may be located away from the site. The functions of the consignment planning device 9, the power transmission and reception planning devices 102, 202, 302, 402, and the plurality of power generation planning devices 101, 201, 301 may be realized by one arithmetic processing device.

[0017] The first power generation planning device 101 belongs to a first site 100. In addition to the first power generation planning device 101, the first site 100 includes a first power transmission and reception planning device 102, at least one CGS 2, at least one power demand facility 3, at least one heat demand facility 4, and a power receiving and distribution facility 5.

[0018] The second power generation planning device 201 belongs to the second site 200. In addition to the second power generation planning device 201, the second site 200 includes a second power transmission and reception planning device 202, at least one CGS 2, at least one power demand facility 3, at least one heat demand facility 4, and a power receiving and distribution facility 5.

[0019] The third power generation planning device 301 belongs to a third site 300. In addition to the third power generation planning device 301, the third site 300 includes a third power transmission and reception planning device 302, at least one CGS 2, at least one power demand facility 3, at least one heat demand facility 4, and a power receiving and distribution facility 5.

[0020] The fourth power transmission and reception planning device 402 belongs to the fourth site 400. In addition to the fourth power transmission and reception planning device 402, the fourth site 400 includes at least one power demanding facility 3 and a power receiving and distribution facility 5. The fourth site 400 does not have a power generation capacity.

[0021] The CGS 2 is a private power generation facility. There is no particular limitation on the type of the CGS 2, and each cogeneration site may be equipped with a different type of CGS 2. The CGS 2 may be, for example, one that generates electricity using an internal combustion engine and utilizes the heat generated during the process, one that generates electricity using a fuel cell and utilizes the heat generated during the process, or one that generates electricity using a steam boiler and a steam turbine and utilizes part of the steam as heat.

[0022] The power demanding facility 3 is a facility that consumes electricity. The power demanding facility 3 is not particularly limited, but examples thereof include manufacturing facilities such as processing machines that consume electricity, air conditioning facilities, lighting facilities, and electronic devices.

[0023] The heat demand facility 4 is a facility that consumes thermal energy such as steam or hot water. The heat demand facility 4 is not particularly limited, but examples include manufacturing facilities that use steam or hot water in a process, air conditioning facilities that use hot water, hot water supply facilities, cleaning facilities, swimming pools, baths, and heaters, etc. In principle, the heat demand facility 4 is supplied with steam or hot water generated from the exhaust heat of the CGS 2 of the site to which it belongs, i.e., its own site.

[0024] The power receiving and distribution equipment 5 has a function of receiving electricity, a function of transforming the voltage into a voltage according to the purpose of use of each equipment, and a function of distributing electricity to each equipment. The power receiving and distribution equipment 5 is connected to the power demand equipment 3 at its own site so as to be able to transmit electricity. The power receiving and distribution equipment 5 is connected to other sites via a power transmission and distribution network 8. The power receiving and distribution equipment 5 is connected to a commercial power supply system 6 of a power company via the power transmission and distribution network 8. In each of the first to third sites 100, 200, 300, the power receiving and distribution equipment 5 is connected to the CGS 2 within the site so as to be able to transmit electricity.

[0025] The power receiving and distribution equipment 5 transmits electricity received from the CGS 2 or a commercial power supply system 6 to power demand equipment 3 within the site. The power receiving and distribution equipment 5 transmits electricity received from the CGS 2 of its own site to other sites via the power transmission and distribution network 8.

[0026] A self-dispatch system is used for power transmission between the first to fourth sites 100, 200, 300, 400 constituting one self-dispatch group G. The self-dispatch system is a service for transmitting electricity between sites in the same group using a power transmission and distribution network 8 managed by a power transmission and distribution business operator. For power transmission within a site, i.e., on-site, a private power transmission system or a self-dispatch system may be used.

[0027] [Energy management method] Here, we will explain the energy management method in the EMS 1. The energy management method in the EMS 1 includes generation of power generation plans performed by the power generation planning devices 101, 201, and 301 in the cogeneration sites 100, 200, and 300, generation of power transmission and reception plans performed by the power transmission and reception planning devices 102, 202, 302, and 402 in each site in the self-dispatch group G, and generation of a self-dispatch plan performed by the dispatch planning device 9. The power transmission and reception plans are, in other words, information related to the surplus power and shortage power of the sites.

[0028] 《Generation plan generation》 The first power generation planning device 101 of the first site 100 generates a power generation plan for the CGS 2 of its own site. FIG. 2 is a flowchart of power generation plan generation by the first power generation planning device 101. As shown in FIG. 2, the first power generation planning device 101 selects whether the first site 100 to which it belongs will perform heat-dominant operation or other operation (step S11). In heat-dominant operation, the output of the CGS 2 is controlled so that the amount of heat discharged with power generation, i.e., the amount of exhaust heat, follows the amount of heat demanded or consumed by the heat demand facility 4 of its own site. An example of the other operation is power-dominant operation. In power-dominant operation, the output of the CGS 2 is controlled so that the amount of power generation follows the power demand of the power demand facility 3 of its own site.

[0029] The first power generation planning device 101 selects heat-dominant operation (YES in step S11) and acquires an energy demand plan for a predetermined period (step S12). The energy demand plan includes a heat demand plan and a power demand plan for a predetermined planning period. The planning period is, for example, one day or one week. The planning period consists of a number of consecutive time periods. The time between the start time and the end time of each time period is a predetermined unit time. The unit time is, for example, shorter than a planning period of 30 minutes or one hour. FIG. 3 is a chart showing an example of a power demand plan, with the vertical axis showing the predicted value of power demand and the horizontal axis showing time. FIG. 4 is a chart showing an example of a heat demand plan, with the vertical axis showing the predicted value of heat demand and the horizontal axis showing time.

[0030] The power demand plan shown in Fig. 3 is created in advance and provided to the first power generation planning device 101. The power demand plan for the first site 100 is a chronological arrangement of predicted values ​​of power demand for power demanding facilities 3 for each time period during the planning period. If the first site 100 has multiple power demanding facilities 3, the predicted value of power demand for the first site 100 is the sum of the predicted values ​​of individual power demand for the power demanding facilities 3 belonging to the first site 100. The predicted value of power demand is a predicted value of the amount of power consumed by the power demanding facilities 3, and differs for each power demanding facility 3 and also differs depending on the operational status, time of day, and season of the site.

[0031] The heat demand plan is created in advance and provided to the first power generation planning device 101. The heat demand plan for the first site 100 is a chronological arrangement of predicted values ​​of heat demand of the heat demand equipment 4 for each time period of the planning period. If the first site 100 has multiple heat demand equipment 4, the predicted value of heat demand for the first site 100 is the sum of the predicted values ​​of heat demand of each of the heat demand equipment 4 belonging to the first site 100. The predicted value of heat demand is a predicted value of the amount of heat consumed by the heat demand equipment 4, and differs for each heat demand equipment 4, and also differs depending on the operational status, time, and season of the site.

[0032] The first power generation planning device 101 determines the load factor of the CGS2 for each time period based on the energy demand plan for the planning period so that the heat demand in the heat demand plan of the first site 100 and the amount of exhaust heat of the CGS2 are substantially equal, that is, so that the heat demand is satisfied without excess or deficiency (step S13). The heat demand and the amount of exhaust heat of the CGS2 are not limited to being strictly equal, and in fact, the load factor of the CGS2 may be determined with a margin added in consideration of losses during transport of heat and use in the heat demand facility 4. The first power generation planning device 101 stores information indicating the relationship between the load factor and the amount of exhaust heat of the CGS2 in advance, and can use this information to determine the load factor that discharges the amount of heat corresponding to the heat demand. The information indicating the relationship between the load factor and the amount of exhaust heat of the CGS2 is, for example, a formula, a map, or a table, and is provided to the first power generation planning device 101 in advance. The method of determining the load factor of the CGS2 may utilize a known method such as a rule given in advance or an optimization calculation. The operation plan for CGS2 is created by arranging the load factors for each time period in a chronological order during the planning period.

[0033] The first power generation planning device 101 generates a power generation plan for the planning period based on the operation plan for the planning period of the CGS2 (step S14). FIG. 5 is a chart showing an example of a power generation plan, in which the vertical axis represents the planned value of the power generation amount and the horizontal axis represents time. As shown in FIG. 5, the power generation plan is a time series of planned values ​​of the power generation amount of the CGS2 for each time period of the planning period. The first power generation planning device 101 stores in advance the relationship between the output and the power generation amount of the CGS2, and can obtain the power generation amount corresponding to the output using a formula or a table. The first power generation planning device 101 generates a power generation plan for the planning period by arranging the power generation amount for each time period obtained in this way in a time series. The first power generation planning device 101 can display and output the heat demand plan, power demand plan, operation plan, and power generation plan of the first site 100 on a display or print them out on paper or the like.

[0034] The second power generation planning device 201 at the second site 200 and the third power generation planning device 301 at the third site 300, like the first power generation planning device 101 at the first site 100, obtain the energy demand plans for their own sites and generate operation plans and power generation plans for their own sites from these.

[0035] <Generation of power transmission and reception plan> In the power generation plan generated as described above, the CGS 2 performs heat-dominant operation so that there is no excess or shortage of heat within the own site, and therefore there may be times when the amount of power generated is in excess or insufficient with respect to the power demand of the own site. FIG. 6 is a diagram showing an example of the relationship between the power generation plan and the power demand, in which the vertical axis represents the planned value of the amount of power generated and the predicted value of the power demand, and the horizontal axis represents time. As shown in FIG. 6, the first power transmission and reception planning device 102 obtains the surplus power and the shortage power for each time period of the planning period based on the power demand plan and the power generation plan of the own site acquired from the first power generation planning device 101. The surplus power is the difference between the amount of power generated and the power demand when the amount of power generated is greater than the power demand. The shortage power is the difference between the amount of power generated and the amount of power generated when the amount of power generated is less than the power demand. In the time period when the amount of power generated is greater than the power demand, the surplus power is a positive value and the shortage power is zero, and in the time period when the amount of power generated is less than the power demand, the surplus power is zero and the shortage power is a positive value, and in the time period when the amount of power generated is equal to or greater than the power demand, the surplus power and the shortage power are zero. Taking into consideration the loss of heat demand and the accuracy of the heat demand plan and the power demand plan, the surplus power and the shortage power may be calculated with a margin added. The surplus power and the shortage power are indicators for power trading. The power transmission and reception plan includes information related to the surplus power and the shortage power in each time period of the planning period. The first power transmission and reception planning device 102 outputs the power transmission and reception plan of its own site, i.e., information related to the surplus power and the shortage power in each time period of the planning period, to the wheeling planning device 9 via the communication network 7.

[0036] The second power transmission and reception planning device 202 and the third power transmission and reception planning device 302, like the first power transmission and reception planning device 102, obtain surplus power and power shortage in each time period of the planning period based on the power demand plan and power generation plan of their own site, and output the power transmission and reception plan of their own site, i.e., information related to the surplus power and power shortage in each time period of the planning period, to the wheeling planning device 9 via the communication network 7. The first power transmission and reception planning device 102, the second power transmission and reception planning device 202, and the third power transmission and reception planning device 302 may output the power generation plan of their own site to the wheeling planning device 9 in addition to the power transmission and reception plan of their own site. In this embodiment, the first site 100, the second site 200, and the third site 300 perform heat-dominant operation. However, it is not necessary for all heat and power cogeneration sites in the group to perform heat-dominant operation, and power-dominant operation may be performed at some heat and power cogeneration sites in the group.

[0037] The fourth power transmission and reception planning device 402 acquires a power demand plan of its own site, and generates information related to surplus power and power shortage for each time period of its own site's planning period based on the power demand plan. Since the fourth site 400 does not have a power generation capacity, the surplus power of the fourth site 400 is zero, and the power shortage of the fourth site 400 corresponds to the power demand. The fourth power transmission and reception planning device 402 outputs the power transmission and reception plan of its own site, i.e., information related to surplus power and power shortage for each time period of the planning period, to the wheeling planning device 9 via the communication network 7.

[0038] <<Generating a group's self-transportation plan>> The consignment planning device 9 generates a self-consignment plan for the group. FIG. 7 is a flowchart of the generation of the self-consignment plan by the consignment planning device 9. As shown in FIG. 7, the consignment planning device 9 acquires a power transmission and reception plan, i.e., information related to surplus power and power shortage in each time period of the planning period, from each site belonging to the self-consignment group G (step S21). That is, information related to surplus power and power shortage of each site in the group is aggregated in the consignment planning device 9. In this embodiment, the consignment planning device 9 acquires information related to surplus power and power shortage in each time period of the planning period from the first to fourth sites 100, 200, 300, 400. The consignment planning device 9 temporarily stores the acquired information.

[0039] The dispatch planning device 9 generates a draft self-dispatch plan for a group of cogeneration sites (hereinafter referred to as a "group of sites in heat-main operation") in which heat-main operation is performed so that power is transferred from a site with surplus power to a site with power shortage for each time period of the planning period (step S22). The draft self-dispatch plan is a draft of the self-dispatch plan. The self-dispatch plan includes a self-dispatch plan including an electricity dispatch source, a dispatch destination that receives power from the dispatch source, and the amount of dispatched power for each time period of the planning period. The self-dispatch plan may include a time period during which electricity is not dispatched.

[0040] FIG. 8 is a diagram for explaining a method of planning a self-dispatch plan element by the dispatch planning device 9. FIG. 8 shows information related to surplus power and shortage power in the planning period of the heat-main operation site group. The dispatch planning device 9 determines a combination of the primary dispatch source and the primary dispatch destination, and the amount of dispatch power from the primary dispatch source to the primary dispatch destination, for each time period based on a rule given in advance. For example, the dispatch planning device 9 determines a site having surplus power among the heat-main operation site group as the primary dispatch source for each time period, and searches for a site having shortage power among the primary dispatch destination candidates. Here, the primary dispatch destination candidates include the heat and power cogeneration sites 100, 200, and 300 performing heat-main operation, a site equipped with a power generation facility and a power demand facility 3 that does not utilize heat, and a site 400 equipped with a power demand facility 3 without power generation capacity, among the multiple sites of the self-dispatch group G. When a site having a power shortage is found among the primary consignment candidates, the consignment planning device 9 determines at least one of the sites having a power shortage as a primary consignment destination, and determines the amount of power to be sent from the primary consignment source to the primary consignment destination. The amount of power to be sent is equal to or less than the amount of surplus power of the primary consignment source and equal to or less than the power shortage of the primary consignment destination. When there are multiple sites having surplus power, the primary consignment destination and the amount of power to be sent are determined for each of the sites having surplus power. Power may be sent from one primary consignment source to two or more primary consignment destinations. Also, power may be sent from two or more primary consignment sources to one primary consignment destination. In this way, the consignment planning device 9 determines the combination of the primary consignment source and the primary consignment destination and the amount of power to be sent for each time period of the planning period, and generates a draft self consignment plan for the planning period.

[0041] For example, in an example of the self-dispatch plan draft shown in Fig. 8, the first site 100 has surplus power between 0:00 and 0:00, and the second site 200 has a power shortage between 0:00 and 0:00, so electricity is self-dispatched from the first site 100 to the second site 200 between 0:00 and 0:00. Similarly, the second site 200 and the third site 300 have surplus power between 0:00 and 0:00, and the first site 100 has a power shortage between 0:00 and 0:00, so electricity is self-dispatched from the second site 200 and the third site 300 to the first site 100 between 0:00 and 0:00. The dispatch planning device 9 may preferentially determine a cogeneration site that is performing heat-dominant operation and has a power shortage as the primary dispatch destination among the primary dispatch destination candidates.

[0042] In the self-dispatch plan draft, in the time period when the primary dispatch destination is not found or the total of the surplus power of the heat-main operation site group exceeds the total of the power shortage of the primary dispatch destination candidate site, the secondary dispatch destination may be supplied with surplus power. When the total of the surplus power of the heat-main operation site group is greater than the total of the power shortage of the primary dispatch destination candidate site for each time period (YES in step S23), the dispatch planning device 9 determines a secondary dispatch destination having a power shortage from among the secondary dispatch destination candidates based on a predetermined rule, and determines the amount of secondary dispatch power from the secondary dispatch source to the secondary dispatch destination (step S24). The total amount of secondary dispatch power may be the difference between the total of the surplus power of the heat and power combined supply site and the total of the power shortage of the primary dispatch destination candidate. The dispatch planning device 9 may perform the same process as above even when the primary dispatch destination is not found. The secondary dispatch destination candidates include sites that are not included in the primary dispatch destination candidates among the multiple sites of the self-dispatch group G. The secondary consignment destination candidates include, for example, cogeneration sites that are in power-dominant operation rather than heat-dominant operation. The secondary consignment destination candidates may also include sites that respond to a call for applications. The secondary consignment destinations and the fees that the secondary consignment destinations pay for receiving electricity may be determined, for example, on a first-come, first-served basis or by auction based on the electricity trading price in the electricity market. The fees may include, for example, a fee for receiving electricity per unit of electricity, i.e., a unit price. If the secondary consignment destination is not determined by a specified time, the surplus electricity of the entire group of sites in heat-dominant operation may be sold to the electricity market.

[0043] In the self-dispatch plan draft, in the time period when the total of the surplus power of the heat operation site group is less than the total of the power shortage of the primary dispatch destination candidate, the power shortage may be supplied from a site in a group other than the site group in which the heat main operation is performed or from the commercial power supply system 6. When the total of the surplus power of the heat main operation site group is less than the total of the power shortage of the primary dispatch destination candidate for each time period (YES in step S25), the dispatch planning device 9 determines a tertiary dispatch source having surplus power from a predetermined tertiary dispatch source candidate based on a predetermined rule, determines a tertiary dispatch destination having a power shortage from the primary dispatch destination candidate, and determines the amount of tertiary dispatch power (step S26). The total amount of tertiary dispatch power may be the difference between the total of the power shortage of the primary dispatch destination candidate and the total of the surplus power of the heat main power generation site. The tertiary dispatch source candidate includes a cogeneration site in which the power main operation is performed in the self-dispatch group G and a site equipped with a power generation facility that does not use heat. The tertiary consignment source candidates may include sites that are solicited and respond to the solicitation. The fees that the tertiary consignment source and the tertiary consignment destination pay for receiving electricity may be determined, for example, on a first-come, first-served basis or by an auction based on the electricity trading price in the electricity market. If the tertiary consignment source is not determined by a predetermined timing, the commercial power supply system 6 may be added to the tertiary consignment source candidates, the commercial power supply system 6 may be determined as the tertiary consignment source, and the shortage of electricity at the site may be covered by purchasing electricity from the commercial power supply system 6 within the range of the contracted electricity amount for each site. The history of the contracted electricity amount and the purchased electricity amount for a predetermined period of each site is stored in the consignment planning device 9. When determining the primary consignment destination, the secondary consignment destination, and the tertiary consignment destination, the consignment planning device 9 may determine the consignment destination from among the consignment destination candidates so that electricity is preferentially consignmented to the site with the smallest difference between the contracted electricity amount and the purchased electricity amount based on the stored history of the purchased electricity amount.

[0044] The transmission planning device 9 generates an own transmission plan by adding power transmission from the secondary transmission source to the secondary transmission destination and power transmission from the tertiary transmission source to the tertiary transmission destination to the own transmission plan draft including information related to power transmission from the primary transmission source to the primary transmission destination (step S27). The generated own transmission plan is output from the transmission planning device 9 to the power transmission and reception planning devices 102, 202, 302, 402 in the group (step S28). The generated own transmission plan may be output from the transmission planning device 9 to a terminal device of the power transmission and distribution business operator that provides the own transmission system. The power transmission and distribution business operator transmits power using the power transmission and distribution network 8 of the own transmission system according to the own transmission plan.

[0045] [Summary] The energy management system 1 according to the first aspect of the present disclosure is an energy management system 1 that includes a plurality of sites including a first combined heat and power supply site 100, 200, 300 equipped with a first cogeneration system 2 that performs a heat-dominant operation to adequately satisfy heat demand with an amount of exhaust heat, and that generates a self-dispatch plan for a predetermined planning period consisting of a plurality of consecutive unit time slots in a self-dispatch group G that is capable of self-dispatch of electricity between the sites, The system includes a wheeling planning device 9, a power generation planning device 101, 201, 301, and a power transmission and reception planning device 102, 202, 302, 402, The power generation planning device 101, 201, 301 is configured to acquire a heat demand plan and an electric power demand plan for a planning period for the first cogeneration site 100, 200, 300, and to calculate a power generation amount of the first cogeneration system 2 so that the heat demand for each time period of the planning period is satisfied without excess or deficiency by the exhaust heat amount of the first cogeneration system 2; The power transmission and reception planning device 102, 202, 302, 402 is configured to obtain surplus power and shortage power from a difference between the power generation amount and the power demand in each time period of the planning period for the first combined heat and power supply site 100, 200, 300, and generate information related to the surplus power and shortage power in each time period of the planning period, obtain a power demand plan for the planning period for the multiple sites other than the first combined heat and power supply site 100, 200, 300, and generate information related to the surplus power and shortage power in each time period of the planning period based on the power demand plan, The transmission planning device 9 is configured to acquire information relating to the surplus power and power shortages of the multiple sites, determine a primary transmission source from among the first heat and power combined supply sites 100, 200, 300 for each time period of the planning period so that electricity is self-transferred from the site with surplus power to the site with power shortage, and determine a primary transmission destination from among predetermined primary transmission destination candidates among the multiple sites, and generate a self-transmission plan including combinations of primary transmission sources and primary transmission destinations for each time period of the planning period and the amount of power to be transmitted from the primary transmission source to the primary transmission destination.

[0046] The energy management system 1 according to the second item of the present disclosure is the energy management system 1 according to the first item, in which the primary distribution destination candidates include at least one of the first combined heat and power supply sites 100, 200, 300, a site equipped with a power generation facility and a power demand facility 3 that does not utilize heat, and a site 400 equipped with a power demand facility 3 but has no power generation capacity, among the multiple sites.

[0047] The energy management system 1 according to the third item of the present disclosure is the energy management system 1 according to the first or second item, wherein the multiple sites are capable of purchasing commercial electricity, the transmission planning device 9 stores the history of the electricity purchase amounts and the contracted electricity amounts of the multiple sites, and determines the site with the smallest difference between the contracted electricity amount and the electricity purchase amount as the primary transmission destination from among the primary transmission destination candidates.

[0048] In general, the cogeneration system 2 has a lower power generation efficiency when operating at or below rated power compared to when operating at rated power, but the exhaust heat temperature is high and the amount of exhaust heat is large. Therefore, the difference in the overall efficiency of electricity and heat combined between when the cogeneration system 2 is operating at or below rated power and when operating at rated power is not significant. In the energy management system 1 according to the above items 1 to 3, heat-dominant operation is performed so that the heat demand of the heat demand facility 4 on the site and the amount of exhaust heat of the cogeneration system 2 correspond to each other, so that the exhaust heat of the cogeneration system 2 is used without waste, and the difference between the amount of electricity generated and the demand for electricity is used without waste by self-dispatch. Therefore, the utilization rate of the electricity and heat generated by the cogeneration system 2 is increased, and high overall energy efficiency and economic efficiency can be expected. Furthermore, the energy management system 1 does not use information related to costs such as the fuel procurement cost of the cogeneration system 2 to generate the self-dispatch plan, so there is no need to disclose procurement costs inside or outside the site. In addition, while a cost-focused self-dispatch plan involves many parameters such as raw material unit prices and wheeling charges, and the calculations are complex, a self-dispatch plan that focuses on heat balance can simplify the calculation process.

[0049] An energy management system 1 relating to a fourth item of the present disclosure is an energy management system 1 relating to any of the first to third items, in which, when there is a time period in which the total surplus power of the first combined heat and power supply sites 100, 200, 300 is greater than the total power shortage of the primary transmission destination candidates, the transmission planning device 9 is configured to select a secondary transmission source from among the first combined heat and power supply sites 100, 200, 300 having surplus power in the time period so that an excess amount of power equivalent to the difference between the total surplus power of the first combined heat and power supply sites 100, 200, 300 and the total power shortage of the primary transmission destination candidates is supplied to a site among the multiple sites of the self-transportation group G other than the primary transmission destination candidate, determine a secondary transmission destination from among predetermined secondary transmission destination candidates including a site among the multiple sites of the self-transportation group G other than the primary transmission destination candidate, and include in the self-transportation plan for the time period a combination of the secondary transmission source and the secondary transmission destination and the amount of transmission power from the secondary transmission source to the secondary transmission destination.

[0050] The energy management system 1 according to the fifth item of the present disclosure is the energy management system 1 according to the fourth item, wherein the plurality of sites includes a second combined heat and power supply site equipped with a second cogeneration system 2 that performs power-dominant operation to meet electricity demand without excess or deficiency through power generation, and the secondary transmission destination candidate includes the second combined heat and power supply site.

[0051] The energy management system 1 according to the sixth item of the present disclosure is the energy management system 1 according to the fourth or fifth item, wherein the multiple sites are capable of purchasing commercial electricity, the transmission planning device 9 stores the history of the electricity purchase amounts and the contracted electricity amounts of the multiple sites, and from among the secondary transmission destination candidates, a site that has a power shortage and has the smallest difference between the contracted electricity amount and the electricity purchase amount is determined as the secondary transmission destination.

[0052] According to the energy management system 1 relating to the above fourth to sixth items, surplus electricity at the thermal power generation sites 100, 200, and 300 is consigned to other sites and used at those sites. This increases the utilization rate of the electricity and heat generated in the cogeneration system 2, and can be expected to achieve high overall energy efficiency and economic efficiency.

[0053] The energy management system 1 according to a seventh aspect of the present disclosure is the energy management system 1 according to any one of the first to sixth aspects, wherein, when there is a time period in which the total of the surplus power of the first cogeneration sites 100, 200, and 300 is less than the total of the shortage power of the first cogeneration site candidates, the dispatch planning device 9 determines whether or not the shortage power of the first cogeneration site candidates 100, 200, and 300 is equal to the shortage power of the first cogeneration site candidates 100, 200, and 300 in the self dispatch group G. a tertiary transmission destination is selected from among the primary transmission destination candidates having a power shortage during the time period so that power is supplied from a site other than the first combined heat and power supply site 100, 200, 300 among the multiple sites of the self-transportation group G, a tertiary transmission source is determined from a site other than the first combined heat and power supply site 100, 200, 300 among the multiple sites of the self-transportation group G, and the self-transportation plan for the time period is configured to include a combination of the tertiary transmission source and the tertiary transmission destination and the amount of power to be transmitted from the tertiary transmission source to the tertiary transmission destination.

[0054] The energy management system 1 according to the eighth item of the present disclosure is the energy management system 1 according to the seventh item, in which the multiple sites are capable of purchasing commercial electricity, the transmission planning device 9 stores the history of the electricity purchase amounts and the contracted electricity amounts of the multiple sites, and determines, from among the primary transmission destination candidates, a site that has a power shortage and has the smallest difference between the contracted electricity amount and the electricity purchase amount as a tertiary transmission destination.

[0055] According to the energy management system 1 relating to the seventh and eighth items, if a power shortage occurs at the thermal power generation sites 100, 200, 300, the shortfall can be made up by receiving supply from other sites, thereby ensuring a stable supply of power to the power demand equipment 3 at each site.

[0056] The energy management method according to the ninth aspect of the present disclosure is an energy management method for a self-dispatch group G including a plurality of sites 100, 200, 300, 400 including cogeneration sites 100, 200, 300 equipped with a cogeneration system 2 performing a heat-dominant operation to meet heat demand without excess or deficiency by exhaust heat, in which a calculation processing device generates a self-dispatch plan for a predetermined planning period consisting of a plurality of consecutive unit time slots, Obtaining heat demand plans and power demand plans for the planning period for the cogeneration sites 100, 200, and 300, and calculating the amount of power generated by the cogeneration system 2 so that the heat demand for each time period of the planning period is met without excess or deficiency by the amount of exhaust heat from the cogeneration system 2; For the cogeneration sites 100, 200, and 300, surplus power and shortage power are calculated from the difference between the amount of power generated and the power demand for each time period during the planning period, and information on the surplus power and shortage power for each time period during the planning period is generated; Acquiring a power demand plan for a planning period for the plurality of sites other than the cogeneration sites 100, 200, and 300, and generating information related to surplus power and shortage power for each time period of the planning period based on the power demand plan; The method includes acquiring information relating to surplus power and power shortages of the multiple sites, determining a transmission source from among the combined heat and power supply sites 100, 200, 300 for each time period of the planning period so that electricity is self-transferred from the site with surplus power to the site with power shortage, and determining a transmission destination from among predetermined transmission destination candidates among the multiple sites, and generating a self-transfer plan including combinations of transmission sources and transmission destinations for each time period of the planning period and the amount of electricity to be transmitted.

[0057] In the energy management method according to the present disclosure, heat-dominant operation is performed so that the heat demand of the heat demand facility 4 on the site corresponds to the amount of exhaust heat from the cogeneration system 2, so that the exhaust heat from the cogeneration system 2 is used without waste, and the difference between the amount of power generated and the power demand is used without waste through self-dispatch. As a result, the utilization rate of the electricity and heat generated in the cogeneration system 2 is increased, and high overall energy efficiency and economic efficiency can be expected. Furthermore, in the energy management method, since information related to costs such as the fuel procurement cost of the cogeneration system 2 is not used to generate the self-dispatch plan, it is not necessary to disclose the procurement cost inside and outside the site. In addition, while a cost-oriented self-dispatch plan has many parameters such as the raw material unit price and the dispatch fee, and the calculation is complicated, a self-dispatch plan that emphasizes heat balance can simplify the calculation process.

[0058] The functions of the wheeling planning device 9, the multiple power generation planning devices 101, 201, 301, and the multiple power transmission and reception planning devices 102, 202, 302, 402 disclosed in this specification may be implemented in circuitry or processing circuitry, including general-purpose processors, application specific processors, integrated circuits, ASICs (Application Specific Integrated Circuits), CPUs (Central Processing Units), conventional circuits, and / or combinations thereof, programmed to realize the functions. Processors include transistors and other circuits and are considered to be circuitry or processing circuitry. A processor may be a programmed processor that executes a program stored in a memory. In this specification, a circuitry, unit, or means is hardware that is programmed to realize or executes the described functions. The hardware may be any hardware disclosed in this specification or any hardware known to be programmed to realize or execute the described functions. If the hardware is a processor considered to be a type of circuitry, the circuitry, means, or unit is a combination of the hardware and software used to configure the hardware and / or processor.

[0059] The above discussion of the present disclosure has been presented for purposes of illustration and description, and is not intended to limit the present disclosure to the form disclosed herein. For example, in the above detailed description, various features of the present disclosure are grouped together in one embodiment for the purpose of streamlining the present disclosure, but some of the features may be combined. In addition, the features included in the present disclosure may be combined into alternative embodiments, configurations, or aspects other than those discussed above. [Explanation of symbols]

[0060] 1: Energy management system 2: Cogeneration system 3: Electricity demand equipment 4: Heat demand equipment 5:Power receiving and distribution equipment 6: Commercial power supply system 7: Communication Network 8: Power transmission and distribution network 9: Wheeling planning device 100, 200, 300, 400 :site 101, 201, 301: Power generation planning device 102, 202, 302, 402: Power transmission and reception planning device G: Self-consignment group

Claims

1. An energy management system for generating a self-dispatch plan for a predetermined planning period consisting of a plurality of consecutive unit time slots in a self-dispatch group that is composed of a plurality of sites including a first combined heat and power site having a first cogeneration system that performs a heat-dominant operation to adequately satisfy heat demand by exhaust heat, and that is capable of self-dispatch of electricity between the sites, comprising: The system includes a wheeling planning device, a power generation planning device, and a power transmission and reception planning device, the power generation planning device is configured to acquire a heat demand plan and an electric power demand plan for the planning period for the first cogeneration site, and to calculate an amount of power generation of the first cogeneration system so that the heat demand for each time period of the planning period is satisfied without excess or deficiency by the amount of exhaust heat of the first cogeneration system; the power transmission and reception planning device is configured to obtain surplus power and power shortage for the first cogeneration site from a difference between the power generation amount and power demand for each time period of the planning period, and generate information related to the surplus power and power shortage for each time period of the planning period; and to obtain a power demand plan for the planning period for the multiple sites excluding the first cogeneration site, and generate information related to the surplus power and power shortage for each time period of the planning period based on the power demand plan; The transmission planning device is configured to acquire information related to surplus power and power shortage of the plurality of sites, determine a primary transmission source from among the first cogeneration site for each time period of the planning period so that electricity is self-transferred from a site having surplus power to a site having power shortage, and determine a primary transmission destination from among predetermined primary transmission destination candidates among the plurality of sites, and generate the self-transmission plan including a combination of the primary transmission source and the primary transmission destination for each time period of the planning period and the amount of power transmitted from the primary transmission source to the primary transmission destination. Energy management system.

2. The primary consignment destination candidates include at least one of the first cogeneration site, a site equipped with a power generation facility and a power demand facility that does not utilize heat, and a site equipped with a power demand facility without a power generation capacity, among the plurality of sites. The energy management system of claim 1 .

3. The plurality of sites are capable of purchasing commercial electricity; The transmission planning device stores a history of the power purchase amounts and contracted power amounts of the plurality of sites, and determines, from among the primary transmission destination candidates, a site having a smallest difference between the contracted power amount and the power purchase amount as the primary transmission destination. The energy management system of claim 1 .

4. The transmission planning device is configured to, when there is a time period in which the total surplus power of the first combined heat and power supply site is greater than the total power shortage of the primary transmission destination candidate, select a secondary transmission source from among the first combined heat and power supply sites having surplus power in the time period so that a surplus amount of power equivalent to a difference between the total surplus power of the first combined heat and power supply site and the total power shortage of the primary transmission destination candidate is supplied to a site other than the primary transmission destination candidate among the multiple sites of the self-transportation group, determine a secondary transmission destination from among predetermined secondary transmission destination candidates including a site other than the primary transmission destination candidate among the multiple sites of the self-transportation group, and include in the self-transportation plan for the time period a combination of the secondary transmission source and the secondary transmission destination and an amount of transmission power from the secondary transmission source to the secondary transmission destination. The energy management system of claim 1 .

5. The plurality of sites includes a second combined heat and power supply site having a second cogeneration system that performs a power-dominant operation to meet power demand without excess or deficiency through power generation, and the secondary consignment destination candidate includes the second combined heat and power supply site. The energy management system according to claim 4.

6. The plurality of sites are capable of purchasing commercial electricity; The transmission planning device stores a history of the power purchase amounts and contracted power amounts of the plurality of sites, and determines, from among the secondary transmission destination candidates, a site that has a power shortage and has the smallest difference between the contracted power amount and the power purchase amount as the secondary transmission destination. The energy management system according to claim 4.

7. The transmission planning device is configured to, when there is a time period in which the total surplus power of the first cogeneration site is less than the total shortage power of the first cogeneration site, select a tertiary transmission destination from among the first cogeneration site candidates having a shortage power in the time period so that a shortage of power equivalent to a difference between the total shortage power of the first cogeneration site candidates and the total surplus power of the first cogeneration site is supplied from a site other than the first cogeneration site among the multiple sites of the self-transportation group, determine a tertiary transmission source from a site other than the first cogeneration site among the multiple sites of the self-transportation group, and include in the self-transportation plan for the time period a combination of the tertiary transmission source and the tertiary transmission destination and the amount of transmission power from the tertiary transmission source to the tertiary transmission destination.

5. An energy management system according to claim 1 or 4.

8. The plurality of sites are capable of purchasing commercial electricity; The transmission planning device stores a history of the power purchase amounts and contracted power amounts of the plurality of sites, and determines, from among the primary transmission destination candidates, a site that has a power shortage and has the smallest difference between the contracted power amount and the power purchase amount, as the tertiary transmission destination.

8. The energy management system of claim 7.

9. A self-dispatch group is a group of sites including a combined heat and power supply site equipped with a cogeneration system that performs heat-dominant operation to meet heat demand without excess or deficiency by exhaust heat, and capable of self-dispatch of electricity between the sites. The self-dispatch group is an energy management method in which a processor generates a self-dispatch plan for a predetermined planning period consisting of a plurality of consecutive unit time slots, obtaining a heat demand plan and an electric power demand plan for the planning period for the cogeneration site, and calculating an amount of power generated by the cogeneration system so that the heat demand for each time period of the planning period is satisfied without excess or deficiency by the exhaust heat amount of the cogeneration system; For the cogeneration site, determining surplus power and shortage power from the difference between the power generation amount and the power demand for each time period of the planning period, and generating information related to surplus power and shortage power for each time period of the planning period; acquiring a power demand plan for the planning period for the plurality of sites excluding the cogeneration site, and generating information on surplus power and shortage power for each time period of the planning period based on the power demand plan; acquiring information on surplus power and power shortages of the plurality of sites, determining a transmission source from among the heat and power cogeneration sites for each time period of the planning period so that electricity is self-transferred from a site having surplus power to a site having a power shortage, and determining a transmission destination from among predetermined transmission destination candidates among the plurality of sites, and generating the self-transfer plan including a combination of the transmission source and the transmission destination and the amount of power to be transmitted for each time period of the planning period; Energy management methods.

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