Power utilization equipment

Abstract

To provide a power utilization facility capable of making a power reception and supplying to an external power system of the power utilization facility without considering a responsibility of a power output device with a simple structure.SOLUTION: A power utilization facility comprises: at least one power output device connected to an external power system via a predetermined first connection point; a power converter device connected to a second connection point on the external power system side by a first connection point; an electric capacitor connected to the power conversion device; and a controller. The controller contains: a first instruction generation part that generates a first instruction for increasing and decreasing an output power from the power output device on the basis of a first power deviation; and a second instruction generation part that generates a second instruction for adjusting the output power on the basis of a second power deviation obtained by subtracting a reception and supplying power from a reception and supplying power target value. The second instruction generation part generates a charging command for charging the electric capacitor in the case where the second power deviation exceeds an upper limit value defined on the basis of a power reception and supplying request value, and generates a discharge command discharged from the electric capacitor wen it is less than a lower limit value.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a power utilization facility including a power output device such as a generator and connected to an external power system so as to enable power transfer with the external power system.

Background Art

[0002] In recent years, electric power companies that govern external power systems such as commercial power systems have made requests to power utilization facilities such as factories that use power from the external power system, such as suppressing the power supplied from the external power system to the power utilization facility (received power). In response to this, power utilization facilities that suppress received power receive payment (e.g., a discount on electricity charges) from the electric power company. Such a transaction is called a negative watt transaction by demand response.

[0003] Also, as power utilization facilities, power utilization facilities equipped with power output devices such as prime mover generators and storage batteries are known. In such power utilization facilities, when conducting a negative watt transaction, the power utilization facility can cover the suppression amount of the power supplied from the external power system to the power utilization facility (demand response requirement amount; hereinafter, DR requirement amount) by increasing the power output by the power output device.

[0004] However, the power supplied to the load changes according to the load situation. Therefore, in order to appropriately control the power transfer to and from the external power system (so that the suppression amount does not fall below the DR requirement amount), it is necessary to control the output power of the power output device according to the load situation.

[0005] From such a perspective, in Patent Document 1 below, when a demand response request (DR request) is made in a system equipped with a storage battery, a received power bias value is added to the actual received power to calculate a virtual received power during a negative watt transaction, and a command value for the system output output from the storage battery is generated based on the virtual received power instead of the actual received power.

[0006] However, in Patent Document 1, it is necessary to switch the control mode depending on the presence or absence of a DR request. Also, in Patent Document 1, the command value (power value) of the system output output from the storage battery is calculated. For this reason, it is necessary to measure the current value of the system output. Therefore, in a power utilization facility equipped with a plurality of power output devices, it is necessary to measure individual output values and calculate individual command values.

[0007] Further, when attempting to apply the aspect of Patent Document 1 to a power utilization facility using a generator such as a prime mover generator instead of a storage battery, when calculating the command value of the system output, it is necessary to use a command value that takes into account the responsiveness of the slow-responding prime mover generator. If responsiveness is not considered, the output of the generator may not be able to follow the command value, and there is a risk that the control will diverge. Also, in a power utilization facility equipped with a plurality of power output devices with different characteristics, it is necessary to consider the responsiveness of each, and it is not easy to apply the aspect of Patent Document 1 to such a system.

[0008] Regarding this, Patent Document 2 below discloses a control mode that takes into account the characteristics of each of a plurality of generators, but it still requires individual control for each of the plurality of generators, and it is necessary to design control parameters for each generator.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0010] As described above, the control modes of Patent Documents 1 and 2 cannot be easily applied to the control of power utilization facilities equipped with various types of power output devices. Further, the above problems can occur not only in the control of power output devices associated with DR requests but also in various control situations of power output devices such as power sales.

[0011] Furthermore, in transactions in the supply-demand adjustment market, for example, there may be a demand for power supply-demand requirements in a shorter unit time, such as what is called the tertiary regulation power -2.

[0012] Therefore, an object of the present disclosure is to solve the above problems, and in a power utilization facility equipped with a power output device, to provide a power utilization facility that can correspond to various supply-demand requirements for the power input and output to and from the external power grid of the power utilization facility with a simple configuration without considering the responsiveness of the power output device.

Means for Solving the Problems

[0013] In one aspect of the present disclosure, an electric power utilization facility includes at least one power output device connected to an external power system to exchange electric power via a predetermined first connection point, an electric power meter for measuring the exchanged electric power at the first connection point, a power converter connected to a second connection point on the external power system side of the first connection point to exchange electric power with the external power system, a storage battery connected to the power converter, and a controller for controlling the power output device and the power converter. The controller includes a target value generation unit that acquires a predetermined power exchange request value and generates a target power exchange value based on the power exchange request value, a power deviation calculation unit that acquires the exchanged electric power measured at the first connection point and calculates a first power deviation obtained by subtracting the acquired exchanged electric power from the target power exchange value, a first command generation unit that generates a first command for increasing or decreasing the output power from the power output device based on the first power deviation, and a second command generation unit that generates a second command for adjusting the output power from the power converter by charging or discharging the storage battery based on a second power deviation obtained by subtracting the exchanged electric power from the target power exchange value. The first command generation unit generates a decrease command for decreasing the output power when the first power deviation is equal to or greater than a predetermined first threshold value, and generates an increase command for increasing the output power when the first power deviation is less than the first threshold value and less than a second threshold value. The second command generation unit generates a charge command for charging the storage battery when the second power deviation exceeds an upper limit value determined based on the power exchange request value, and generates a discharge command for discharging the storage battery when the second power deviation is less than a lower limit value determined based on the power exchange request value.

Effect of the Invention

[0014] According to the present disclosure, in an electric power utilization facility including a power output device, the exchanged electric power of the electric power utilization facility with an external power system can be made to correspond to various supply and demand requirements with a simple configuration without considering the responsiveness of the power output device.

Brief Description of the Drawings

[0015]

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DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and redundant descriptions thereof are omitted.

[0017] FIG. 1 is a block diagram showing a schematic configuration of a power system including power utilization equipment according to an embodiment of the present disclosure. As shown in FIG. 1, the power utilization equipment 1 includes a plurality of power output devices 2i. Here, i = 1, 2,... m. In the example of FIG. 1, since there are three power output devices 2i, m = 3. The plurality of power output devices 2i are connected to an external power system 4 via a first connection point 31. A load 5 provided in the power utilization equipment 1 is also connected to the first connection point 31. Further, the power utilization equipment 1 includes a power meter 8 that measures the power RP1 transmitted and received at the first connection point 31.

[0018] Thereby, the power utilization equipment 1 can transmit and receive power to and from the external power system 4 via the first connection point 31. That is, it is possible to receive power from the external power system 4 and supply power to the load 5. Also, it is possible to supply the power output from the plurality of power output devices 2i to the load 5 or transmit (sell) the power to the external power system 4.

[0019] Furthermore, the power utilization equipment 1 includes a power converter 91 connected to the external power system 4 at a second connection point 32 on the external power system 4 side from the first connection point 31. A capacitor 92 is connected to the power converter 91. The power converter 91 supplies power to the external power system 4 by discharging the power stored in the capacitor 92, and charges the capacitor 92 by supplying the power of the external power system 4 to the capacitor 92. The capacitor 92 is, for example, a secondary battery or a capacitor. The power utilization equipment 1 includes a charge state detector 93 that detects the charge state of the capacitor 92. Note that the charge state is also denoted as SOC (State Of Charge) in the following description and drawings.

[0020] The power utilization device 1 includes a controller 6 that controls a plurality of power output devices 2i and a power converter 91. Alternatively, the controller 6 may be provided independently of the power utilization device 1. Further, the controller 6 may include a plurality of power output device controllers that control each of the plurality of power output devices 2i, and an upper controller that gives control commands to each power output device controller. The controller 6 includes, for example, a computer such as a microcontroller or a personal computer. For example, the controller 6 includes a CPU, a main memory such as a RAM, a storage, a communication interface, etc. Control programs and various data are stored in the storage of the controller 6.

[0021] Note that the functions of the elements disclosed in this specification can be executed using a circuit or processing circuit including a general-purpose processor, a dedicated processor, an integrated circuit, an ASIC (Application Specific Integrated Circuits), a conventional circuit, or a combination thereof configured or programmed to execute the disclosed functions. Since a processor includes transistors and other circuits, it is regarded as a processing circuit or a circuit. In this specification, a circuit, a unit, or a means (… section) is hardware that executes the listed functions, or hardware programmed to execute the listed functions. The hardware may be the hardware disclosed in this specification, or other known hardware programmed or configured to execute the listed functions. When the hardware is a processor considered to be a type of circuit, the circuit, unit, or means is a combination of hardware and software, and the software is used in the configuration of the hardware and / or the processor.

[0022] The external power system 4 is, for example, a commercial power system. The power utilization facility 1 is, for example, a factory. The power output device 2i is, for example, a generator. The generators include, for example, prime mover generators such as steam turbines, gas turbines, gas engines, and diesel engines. The power output device 2i may be, for example, a capacitor such as a secondary battery. The plurality of power output devices 2i may include a plurality of types of generators having different power generation efficiencies, power generation costs, response performances, etc. Further, the plurality of power output devices 2i may include both a generator and a capacitor.

[0023] Note that a power generation facility independent of the controller 6 may be connected to the first connection point 31. Such a power generation facility is, for example, a power generation facility using renewable energy such as a solar power generation facility. Since such a power generation facility cannot adjust the generated power, it is not a control target of the controller 6. Note that renewable energy means natural energy such as sunlight, hydraulic power, wind power, and geothermal energy. Also, there may be a power output device that can adjust the generated power by the controller 6, such as a prime mover generator, but is not a control target of the controller 6.

[0024] Hereinafter, the control mode of the controller 6 during negative watt trading will be exemplified. In the following example, for example, based on the power transfer request value RQT sent from another power management system 7 such as an aggregator to the controller 6 and the transferred power RP1 measured by the power meter 8, a first command SC1 for increasing or decreasing the output power from the power output device 2i and a second command SC2 for adjusting the output power from the power converter 91 are generated.

[0025] The power transfer request value RQT includes a plurality of request components for the received power planned value BL. In the following example, the first unit time, the second unit time, and the third unit time will be used as the time divisions serving as the reference for the power transfer request value and the control of the controller 6. For example, the first unit time is 45 minutes, the second unit time is 30 minutes, and the third unit time is 15 minutes, but the combination is not limited thereto.

[0026] The plurality of demand components includes a first power reception suppression demand amount RQ1 per first unit time and a second power reception suppression demand amount RQ2 per second unit time. For example, the first power reception suppression demand amount RQ1 corresponds to the demand amount by the tertiary regulation power -2, and the second power reception suppression demand amount RQ2 corresponds to the DR demand amount. The first power reception suppression demand amount RQ1 and the second power reception suppression demand amount RQ2 are independent demand components from each other.

[0027] First, the second power reception suppression demand amount RQ2 will be described. FIG. 2 is a schematic graph illustrating demand response in negative watt trading. In the graph of FIG. 2, the horizontal axis indicates time, and the vertical axis indicates demand power. In FIG. 2, the first power reception suppression demand amount RQ1 is not considered.

[0028] In the storage of the controller 6, data of the planned power reception value BL is stored. The planned power reception value BL indicates the planned power reception and transmission value per second unit time. The planned power reception value BL may be created, for example, by dividing one day into time zones per second unit time and averaging the actual values of the demand amounts per second unit time for the recent several days for each second unit time zone. However, the method for determining the planned power reception value BL is not particularly limited, and various methods are assumed. The second unit time is, as described above, for example, 30 minutes, but is not particularly limited.

[0029] The data of the planned power reception value BL is sent in advance to another power management system 7 such as an aggregator that is a requester for demand response. Hereinafter, in this specification, demand response may be abbreviated as DR. The power management system 7 transmits the second power reception suppression demand amount RQ2 corresponding to the controller 6 of the power utilization facility 1 based on the planned power reception value BL sent from the power utilization facility 1. The data of the second power reception suppression demand amount RQ2 transmitted to the controller 6 includes information on the DR demand period TDR indicating the target time zone. In the example of FIG. 2, demand suppression corresponding to the second power reception suppression demand amount RQ2 is requested between 12:00 and 17:00. Note that the data of the planned power reception value BL may also be calculated by the power management system 7 based on past demand amounts and notified to the power utilization facility 1.

[0030] The power management system 7 monitors the actual demand RL, which is the power transmitted and received at the third connection point 30, which is the connection point between the power utilization equipment 1 and the external power system 4 during the DR request period TDR. The third connection point 30 is located on the external power system 4 side from the first connection point 31 and the second connection point 32. When there is no power transmission and reception between the power converter 91 and the external power system 4, the actual demand RL at the third connection point 30 coincides with the power transmitted and received RP1 at the first connection point 31. In this embodiment, the actual demand RL and the power transmitted and received RP1 are positive values when the power utilization equipment 1 receives power supply from the external power system 4. The power management system 7 determines whether the actual demand RL in the power utilization equipment 1 is the power obtained by subtracting the second power reception suppression requirement amount RQ2 from the power reception planned value BL, that is, whether RP = BL - RQ2 during the DR request period TDR. When the actual demand RL is suppressed by the second power reception suppression requirement amount RQ2 from the power reception planned value BL, the power management system 7 determines that the demand response is achieved and gives a predetermined consideration to the power utilization equipment 1. When the actual demand RL is not suppressed by the second power reception suppression requirement amount RQ2 from the power reception planned value BL, the power management system 7 determines that the demand response is not achieved and requests a predetermined penalty from the power utilization equipment 1.

[0031] As described above, the power reception planned value BL is set based on, for example, the actual value of the past actual demand RL. However, since the demand of the actual load 5 changes daily, the demand of the load 5 during the implementation of the demand response does not necessarily coincide with the power reception planned value BL. Therefore, there may be a case where the demand response cannot be achieved simply by additionally outputting the power of the second power reception suppression requirement amount RQ2 by the power output device 2i.

[0032] FIG. 3 is a schematic graph showing an example when a difference occurs between the planned received power value and the actual demand in the demand response shown in FIG. 2. In the example of FIG. 3, the power required by the power utilization facility 1 during the DR request period TDR is shown as the actual demand RL, and it has increased from the planned received power value BL. In this case, during the DR request period TDR, just by additionally outputting the power corresponding to the second received power suppression requirement amount RQ2 from the power output device 2i with respect to the planned received power value BL, the transmitted and received power RP1 cannot be suppressed to the transmitted and received power target value RPo, which is the virtual demand assumed in advance with respect to the planned received power value BL. That is, as a result, the second received power suppression requirement amount RQ2 cannot be suppressed by the increase in the actual demand (RL−BL) with respect to the planned received power value BL. The hatched area in FIG. 3 represents the power amount that has not been achieved for the DR request.

[0033] Thus, it is necessary to adjust the output of the power output device 2i according to the actual demand RL with respect to the DR request. For this reason, the controller 6 in the present embodiment includes a target value generation unit 60, a power deviation calculation unit 61, a first command generation unit 62, and a power deviation correction unit 63 shown in FIG. 5 described later as control blocks or control circuits.

[0034] Next, the first received power suppression requirement amount RQ1 will be described. FIG. 4 is a schematic graph illustrating the tertiary regulation power -2 in the power supply and demand adjustment market. In the graph of FIG. 4, the horizontal axis represents time, and the vertical axis represents the demand power. FIG. 4 shows a case where there is no fluctuation in the planned received power value BL and there is no DR request, that is, the second received power suppression requirement amount RQ2 is 0.

[0035] As described above, the power management system 7 transmits the second received power suppression requirement amount RQ2 to the controller 6 of the power utilization facility 1 corresponding thereto based on the planned received power value BL sent from the power utilization facility 1. The power utilization facility 1 operates to achieve power balancing in the external power system 4 by adjusting the transmitted and received power based on such a planned value.

[0036] On the other hand, even power transmission and distribution operators conduct grid operation based on a power generation plan formulated based on demand forecasting and the like. However, due to changes in the amount of power generation from solar power generation or the like, or an increase in power consumption due to a temperature rise exceeding expectations, the actual supply and demand of power may deviate from the prediction. In such a case, the power transmission and distribution operator may issue a differential power demand to some consumers via the power management system 7 to suppress the received power, for example, a secondary frequency control power -2. The power management system 7 requests, as a requirement for the secondary frequency control power -2, to increase or decrease the transmitted and received power from the planned received power value in the corresponding power utilization facility 1 by a predetermined required amount at the first unit time after the request time. In the present embodiment, the predetermined required amount is denoted as the first received power suppression required amount RQ1.

[0037] In the present embodiment, the controller 6 monitors the presence or absence of a differential power demand every third unit time. The third unit time is set to a time shorter than the first unit time and the second unit time. For example, when the first unit time is 45 minutes and the second unit time is 30 minutes, the third unit time is set to 15 minutes, which is the greatest common divisor of the two.

[0038] In the present embodiment, the reference time is [n], the time after the third unit time from the reference time [n] is [n + 1], the time after the third unit time from the time [n + 1] is [n + 2], and the time after the third unit time from the time [n + 2] is [n + 3]. The time [n + 2] is equal to the time after the second unit time from the reference time [n], and the time [n + 3] is equal to the time after the first unit time from the reference time. Further, the first received power suppression required amount RQ1 in the differential power demand generated at the reference time [n] is denoted as RQ1[n + 3].

[0039] FIG. 4 shows an example in which the first power reception suppression required amount RQ1 changes from the first value P1 to a second value P2 greater than the first value P1 at 10:00. Assuming that the reference time [n] is 10:00, the first power reception suppression required amount RQ1[j] (j =..., n - 1, n, n + 1, n + 2) in the differential power demand up to time [n - 1] is all P1. Therefore, if the first power reception suppression required amount RQ1 does not change at the reference time [n], the power transfer target value RPo up to time [n + 2], that is, 10:30, is RPo = BL - P1.

[0040] However, since the first power reception suppression required amount RQ1 changes from the first value P1 to a second value P2 greater than the first value P1 at 10:00, which is the reference time [n], in the corresponding power utilization equipment 1, it is necessary to perform power reception suppression by an amount corresponding to the second value P2 from the power reception planned value BL by the time [n + 3], that is, 10:45, which is one unit time after the reference time [n]. Therefore, the controller 6 sets the power transfer target value RPo after the reference time [n] to a value obtained by subtracting the first power reception suppression required amount RQ1[n + 3] = P2 from the power reception planned value BL.

[0041] Also, a tolerance TI is set for the differential power demand. The tolerance TI is set, for example, within a range of plus or minus 10% of the differential power demand. In the example of FIG. 4, until the reference time [n], the controller 6 needs to adjust the output power so that the actual demand RL is within the tolerance TI range centered on the power transfer target value RPo1 (RPo1 = BL - P1) based on the first value P1, that is, within the range between the upper limit value UL1 and the lower limit value LL1. Also, after time [n + 3], the controller 6 needs to adjust the output power so that the actual demand RL is within the tolerance TI range centered on the power transfer target value RPo2 (RPo2 = BL - P2) based on the second value P2, that is, within the range between the upper limit value UL2 and the lower limit value LL2. Note that the upper limit value means the upper limit value of the differential power demand, that is, the upper limit value of the suppression amount for suppressing the demand power, and the demand power in FIG. 4 is the allowable minimum value of the power transfer target value RPo. Similarly, the lower limit value means the lower limit value of the differential power demand, that is, the lower limit value of the suppression amount for suppressing the demand power, and the demand power in FIG. 4 is the allowable maximum value of the power transfer target value RPo.

[0042] Also, during the period from the reference time [n] to time [n + 3], the controller 6 adjusts the output power so that it falls within the range between the lower limit value LL1 up to the reference time [n] and the upper limit value UL2 from time [n + 3] as the transition period of the differential power demand.

[0043] Here, the followability to the power transfer target value RPo at the time of differential power demand requires followability in a shorter period compared to the followability to the power transfer target value RPo for the DR demand. For example, while followability in 30 - minute units is required for the DR demand, followability in 5 - minute units is required for the differential power demand. Therefore, there is a risk of going out of the allowable range of the differential power demand with only the output adjustment of the power output device 2i. Thus, in the present embodiment, the power converter 91 and the capacitor 92 are used to enable power adjustment in a shorter time.

[0044] Therefore, the controller 6 in the present embodiment includes, as control blocks or control circuits, a target value generation unit 60, a limit range generation unit 64, a second command generation unit 65, and a state of charge correction unit 66 shown in FIG. 5 described later.

[0045] FIG. 5 is a block diagram showing the configuration of the control block of the controller shown in FIG. 1. As described above, information on the planned received power value BL is stored in advance in the storage of the controller 6. The controller 6 acquires information on the received and transmitted power RP1 at the first connection point 31 measured by the power measuring device 8. Further, the power management system 7 transmits the first received power suppression request amount RQ1 and the second received power suppression request amount RQ2 to the controller 6. The controller 6 acquires the information on the first received power suppression request amount RQ1 and the second received power suppression request amount RQ2 and stores them in the storage. More specifically, a planned value table is stored in the storage of the controller 6. The planned value table has a data set in which the time for each third unit time and the received power planned value BL, the first received power suppression request amount RQ1, and the second received power suppression request amount RQ2 corresponding to each time are associated. Each data in the planned value table is expanded at the time interval of the third unit time and stored in the storage.

[0046] As described above, regarding the first received power suppression request amount RQ1, the controller 6 acquires the value at time [n + 3] from time [n] at time [n]. Therefore, the planned value table at time [n] includes the values of the first received power suppression request amount RQ1 for each third unit time up to time [n + 3].

[0047] Note that the planned value table may include data indicating whether the differential power request is valid or not. By registering in advance with the power management system 7 the time zone for performing power adjustment for the differential power request, the power utilization equipment 1 can perform power adjustment for the differential power request only within the registered time zone. Even if a differential power request occurs outside the registered time zone, the power utilization equipment 1 does not make the differential power request. The data indicating whether the differential power request is valid or not can check whether the differential power request has occurred within the registered time zone.

[0048] The controller 6 includes a target value generation unit 60, a power deviation calculation unit 61, a first command generation unit 62, a power deviation correction unit 63, a limit range generation unit 64, a second command generation unit 65, and a state of charge correction unit 66 in order to control the power output device 2i and the power converter 91 based on the DR request and the differential power request described above.

[0049] First, the control system of the first command SC1 for the power output device 2i will be described. FIG. 6 is a block diagram showing a configuration example of the target value generation unit, the power deviation calculation unit, and the first command generation unit shown in FIG. 5. The target value generation unit 60 calculates the power transfer target value RPo by subtracting the first power reception suppression requirement amount RQ1 and the second power reception suppression requirement amount RQ2 from the power reception planned value BL. Note that the differential power request at the reference time [n] is to suppress the power reception of the first power reception suppression requirement amount RQ1[n + 3] at the time [n + 3] after the first unit time. However, as described above, it is incorporated into the power transfer target value RPo at the time of the reference time [n]. That is, the power transfer target value RPo at the reference time [n] is RPo = BL[n] - RQ2[n] - RQ1[n + 3].

[0050] The power deviation calculation unit 61 calculates a first power deviation ΔRP by subtracting the measured power transfer RP1 from a predetermined power transfer target value RPo. Note that, as will be described later, the first power deviation ΔRP is a value obtained by adding the power correction value RPc calculated by the power deviation correction unit 63 and subtracting the SOC correction value SOCc calculated by the state of charge correction unit 66 from RPo - RP1. However, for now, the power correction value RPc and the SOC correction value SOCc are not considered.

[0051] The first command generation unit 62 generates a first command SC1 for increasing or decreasing the output power of the power output device 2i based on the first power deviation ΔRP calculated by the power deviation calculation unit 61. The first command SC1 generated by the first command generation unit 62 is a state command including an increase command SC1u, a decrease command SC1d, and a maintenance command SC1m. In this specification, the state command is a command for setting the power output device 2i to any one of the power output states of the output increase state, the output decrease state, or the output maintenance state, and is defined as a concept that does not include a specific power output target value.

[0052] The increase command SC1u is a command for increasing the output power (instantaneous value) of the power output device 2i (setting it to the output increase state). For example, when the power output device 2i is a prime mover generator, the increase command SC1u is a command for increasing the generated power to the governor of the prime mover. The decrease command SC1d is a command for decreasing the output power (instantaneous value) of the power output device 2i (setting it to the output decrease state). For example, when the power output device 2i is a prime mover generator, the decrease command SC1d is a command for reducing the generated power to the governor of the prime mover. The maintenance command SC1m is a command for maintaining the output power (instantaneous value) of the power output device 2i (setting it to the output maintenance state). For example, when the power output device 2i is a prime mover generator, the maintenance command SC1m is a command for maintaining the generated power to the governor of the prime mover.

[0053] FIG. 6 schematically shows, as a graph, the command generation mode in the first command generation unit 62. As shown in FIG. 6, when the first power deviation ΔRP is greater than or equal to a predetermined first threshold value T1, the first command generation unit 62 generates a decrease command SC1d. When the first power deviation ΔRP is less than a second threshold value T2 that is less than the first threshold value T1, the first command generation unit 62 generates an increase command SC1u. Further, when the first power deviation ΔRP is greater than or equal to the second threshold value T2 and less than the first threshold value T1, the first command generation unit 62 generates a maintenance command SC1m.

[0054] For example, the first threshold value T1 is set to a predetermined positive value, and the second threshold value T2 is set to a negative value having the same magnitude as the first threshold value T1. Alternatively, the first threshold value T1 may be set to a predetermined positive value, and the second threshold value T2 may be set to a negative value having a magnitude different from that of the first threshold value T1. Further, when a predetermined offset value is given to the first power deviation ΔRP, both the first threshold value T1 and the second threshold value T2 may be positive values or both may be negative values.

[0055] The first command SC1 generated by the first command generation unit 62 is sent to each of the plurality of power output devices 2i. At this time, the first command SC1 sent to each of the plurality of power output devices 2i is a common command. That is, it is not necessary to individually customize the first command SC1 according to the output characteristics or the like of the power output device 2i.

[0056] The first command SC1 output from the first command generation unit 62 may be constituted by, for example, continuously output pulses. In this case, the increase command SC1u is configured to continuously output output increase pulses that are positive pulses, for example. Further, the decrease command SC1d is configured to continuously output output decrease pulses that are negative pulses, for example. Further, the maintenance command SC1m is configured to be in a state where no pulse is output. Alternatively, three pulses having different amplitudes or widths may be assigned to these state commands SC1u, SC1d, and SC1m.

[0057] Each power output device 2i that has received such a first command SC1 performs output control according to the content of the first command SC1. While receiving the increase command SC1u, the power output device 2i continuously increases the output. While receiving the decrease command SC1d, the power output device 2i continuously decreases the output. While receiving the maintenance command SC1m, the power output device 2i continuously maintains the output. For example, when the power output device 2i is a generator, the output of the governor is adjusted according to the first command SC1.

[0058] At this time, each power output device 2i performs output control according to its own responsiveness. For example, a power output device 2i with fast response increases its output at a high rate in response to the increase command SC1u. A power output device 2i with slow response increases its output at a low rate in response to the increase command SC1u. Therefore, even if the types of prime movers or the responsiveness differ among the plurality of power output devices 2i, the controller 6 may output a single (common) first command SC1 without considering the responsiveness of each power output device 2i.

[0059] FIG. 7 is a schematic graph when power transmission and reception control in the present embodiment is performed in the demand response shown in FIG. 3. In FIG. 7, the received power planned value BL and the second received power suppression required amount RQ2 required by the power management system 7 are the same as those in FIG. 3. Also in FIG. 7, similar to FIG. 3, the actual demand RL, which is the power required by the power utilization facility 1 during the DR required period TDR, is increasing from the received power planned value BL.

[0060] According to the present embodiment, the measured power transmission and reception power RP1 is controlled to match the power transmission and reception power target value RPo (= BL - RQ2). That is, when the actual demand RL in the power utilization facility 1 increases from the received power planned value BL, the output power of the power output device 2i increases to supplement the increased power. As a result, the power borne by the power output device 2i during the DR required period TDR with respect to the received power planned value BL becomes the power RQc obtained by adding the deviation between the actual demand RL and the received power planned value BL to the second received power suppression required amount RQ2. The amount of electric power at this time is indicated by the hatched area in FIG. 7.

[0061] As is clear from FIG. 7, according to the above configuration, by increasing or decreasing the power output by the power output device 2i according to the first power deviation ΔRP from the power transmission and reception power target value RPo of the power transmission and reception power RP1, regardless of the load fluctuation situation in the power utilization facility 1, the power transmission and reception power RP1 can be maintained at the power transmission and reception power target value RPo.

[0062] Moreover, even though a plurality of power output devices 2i are connected to the first connection point 31, it is not necessary to individually measure the output power of the power output devices 2i, so the system configuration in the power utilization facility 1 can be simplified. Further, as described above, the first command SC1 for the power output device 2i is only a simple increase command SC1u, decrease command SC1d, or maintenance command SC1m, and it is not necessary to perform control adjustment in the controller 6 considering the responsiveness of the power output device 2i.

[0063] For such a first command SC1, in the power output device 2i, the power output device 2i with a fast response speed responds quickly, and the power output device 2i with a slow response speed responds slowly. Therefore, even if power output devices 2i with different responsiveness are provided as the plurality of power output devices 2i, it is possible to automatically share the output power according to the responsiveness among the plurality of power output devices 2i. In other words, a plurality of power output devices 2i with different responsiveness can be connected to a common first connection point 31, and the sharing adjustment of power can be easily performed. As the plurality of power output devices 2i with different responsiveness, different types of generators may be connected, or a generator and a storage battery may be connected.

[0064] Furthermore, as the plurality of power output devices 2i, for example, when there is a power output device with little remaining capacity operating near its rating and a power output device with a lot of remaining capacity, in response to the increase command SC1u, since the power output device with little remaining capacity does not output power exceeding its rating, it is possible to perform a sharing such that the output power burden on the power output device with a lot of remaining capacity is automatically increased.

[0065] From the above, according to the present embodiment, in the power utilization facility 1 provided with the power output device 2i, with a simple configuration, without considering the responsiveness of the power output device 2i, it is possible to appropriately control the power input and output RP1 to the external power system 4 of the power utilization facility 1 so that it becomes the power input and output target value RPo.

[0066] In addition, the first command generation unit 62 does not need to acquire the output power of each power output device 2i or the power consumption of the load in order to generate the first command SC1. That is, the power utilization facility 1 in the present embodiment does not need to be configured to individually measure the output power of the power output device 2i or to measure the power consumption of the load. Therefore, the system configuration in the power utilization facility 1 can be simplified. Further, even when a change in the device configuration in the power utilization facility 1 is required, it is possible to cope without changing the control.

[0067] Here, in the present embodiment, when the first power deviation ΔRP is equal to or greater than the second threshold value T2 and less than the first threshold value T1, the first command generation unit 62 generates a maintenance command SC1m. That is, even when the first power deviation ΔRP is not zero, the output power output from the power output device 2i is maintained. By creating a dead zone where neither such an increase command nor a decrease command is issued, it is possible to suppress frequent changes in the output power from the power output device 2i.

[0068] On the other hand, when the first power deviation ΔRP is maintained between the first threshold value T1 and the second threshold value T2, the first power deviation ΔRP will continue to remain. Therefore, the controller 6 performs control based not only on the power transfer RP1 but also on the amount of power transfer. More specifically, the power deviation correction unit 63 of the controller 6 generates a power correction value based on the amount of power transfer, and corrects the first power deviation ΔRP using the power correction value RPc. At this time, the first power deviation ΔRP is RPo + RPc - RP1.

[0069] FIG. 8 is a block diagram showing a configuration example of the power deviation correction unit shown in FIG. 5. As shown in FIG. 8, the power deviation correction unit 63 includes a power amount deviation calculation unit 631 and a correction value generation unit 632. The power amount deviation calculation unit 631 calculates a received and transmitted power amount RE1 obtained by integrating the received and transmitted power RP1 and a received and transmitted power amount target value REo obtained by integrating the received and transmitted power target value RPo, and calculates a power amount deviation ΔRE of the received and transmitted power amount RE1 with respect to the received and transmitted power amount target value REo. The power amount deviation calculation unit 631 resets the integration of the received and transmitted power RP1 for obtaining the received and transmitted power amount RE1 and the integration of the received and transmitted power target value RPo for obtaining the received and transmitted power amount target value REo every second unit time.

[0070] In the present embodiment, the power amount deviation calculation unit 631 includes a received and transmitted power amount calculation unit 633 and a received and transmitted power amount target value calculation unit 634. The received and transmitted power amount calculation unit 633 calculates the received and transmitted power amount RE1 by integrating the measured received and transmitted power RP1. The received and transmitted power amount target value calculation unit 634 calculates the received and transmitted power amount target value REo by integrating a value obtained by subtracting a SOC correction value SOCc, which will be described later, from the received and transmitted power target value RPo.

[0071] Both the received and transmitted power amount calculation unit 633 and the received and transmitted power amount target value calculation unit 634 include an integrator. That is, the received and transmitted power amount calculation unit 633 integrates the input received and transmitted power RP1 (instantaneous value). A reset signal Sr is input to the received and transmitted power amount calculation unit 633 every second unit time. The power deviation correction unit 63 includes a timer 635 and outputs a reset signal Sr every second unit time. The received and transmitted power amount calculation unit 633 resets the integration result every time it receives the reset signal Sr. The integrated value output as a result becomes the received and transmitted power amount RE1 obtained by integrating the received and transmitted power RP1 for the second unit time.

[0072] Similarly, the power transfer amount target value calculation unit 634 integrates the power transfer target value RPo after SOC correction, which is obtained by subtracting the SOC correction value SOCc from the input power transfer target value RPo, i.e., RPo - SOCc (instantaneous value). A reset signal Sr output from the timer 635 every second unit time is also input to the power transfer amount target value calculation unit 634. The power transfer amount target value calculation unit 634 resets the integration result every time it receives the reset signal Sr. The integration value output as a result is the power transfer amount target value REo obtained by integrating the power transfer target value RPo - SOCc after SOC correction over the second unit time.

[0073] In the present embodiment, the period of the reset signal Sr is the second unit time and is equal to the update timing of the second power reception suppression requirement amount RQ2 by the power management system 7. Thereby, the power adjustment based on the power amount can be synchronized with the timing at which the power management system 7 evaluates the achievement of demand response.

[0074] The power amount deviation calculation unit 631 calculates a power amount deviation ΔRE by subtracting the power transfer amount RE1 from the power transfer amount target value REo. The correction value generation unit 632 generates a power correction value RPc from the power amount deviation ΔRE. More specifically, when the power amount deviation ΔRE is greater than or equal to a predetermined third threshold value T3, the correction value generation unit 632 generates a power correction value RPc such that the first power deviation ΔRP increases. When the power amount deviation ΔRE is less than a fourth threshold value T4 that is smaller than the third threshold value T3, the correction value generation unit 632 generates a power correction value RPc such that the first power deviation ΔRP decreases. In the present embodiment, the third threshold value T3 is set to a predetermined positive value, and the fourth threshold value T4 is set to a negative value having the same magnitude as the third threshold value T3.

[0075] For example, when the first power deviation ΔRP is greater than 0 and maintains a value smaller than the first threshold T1, the power quantity deviation ΔRE monotonically increases within the second unit time. When the power quantity deviation ΔRE exceeds the third threshold T3, the correction value generation unit 632 generates a power correction value RPc such that the first power deviation ΔRP increases. For example, a predetermined positive offset value Pch is given as the power correction value RPc. The magnitude of the offset value Pch is not particularly limited, but may be, for example, equal to or greater than the first threshold T1.

[0076] When the magnitude of the offset value Pch is greater than the magnitude of the first threshold T1, the corrected first power deviation ΔRP input to the first command generation unit 62 exceeds, or is likely to exceed, the first threshold T1. Accordingly, the first command generation unit 62 outputs, or is likely to output, a decrease command SC1d. As a result, the first power deviation ΔRP decreases.

[0077] The same applies when the first power deviation ΔRP is less than 0 and maintains a value smaller than the second threshold T2. When the power quantity deviation ΔRE falls below the fourth threshold T4, the correction value generation unit 632 generates a power correction value RPc such that the first power deviation ΔRP decreases. For example, a predetermined negative offset value Pcl is given as the power correction value RPc.

[0078] When the magnitude of the offset value Pcl is greater than the magnitude of the second threshold T2, the corrected first power deviation ΔRP input to the first command generation unit 62 falls below, or is likely to fall below, the second threshold T2. Accordingly, the first command generation unit 62 outputs, or is likely to output, an increase command SC1u. As a result, the first power deviation ΔRP increases.

[0079] According to such a configuration, by adding a power correction value RPc based on the power reception and transmission amount RE1 to the first power deviation ΔRP based on the measured power reception and transmission power RP1, it is possible to correct the accumulation of minute deviations that may occur when only the instantaneous value of the power reception and transmission power RP1 is controlled. Therefore, it is possible to appropriately control the power reception and transmission amount RE1 for each second unit time used for evaluation and determination of the achievement rate of demand response so that it becomes the power reception and transmission amount target value REo. Thereby, the achievement rate of demand response can be increased.

[0080] In addition, in the present embodiment, when the power amount deviation ΔRE is equal to or greater than the fourth threshold value T4 and less than the third threshold value T3, the correction value generation unit 632 sets the power correction value RPc to 0. That is, in this case, correction by the power amount is not performed. Further, the correction value generation unit 632 has a hysteresis characteristic between the third threshold value T3 and the fourth threshold value T4, which are threshold values for switching from the state of outputting 0 as the power correction value RPc to outputting predetermined offset values Pch and Pcl, and the fifth threshold value T5 and the sixth threshold value T6, which are threshold values for switching from the state of outputting the predetermined offset values Pch and Pcl as the power correction value RPc to 0.

[0081] That is, the fifth threshold value T5 for switching the power correction value RPc from the state of outputting the positive offset value Pch to 0 is set to a value that is greater than 0 and less than the third threshold value T3 for the power amount deviation ΔRE. Similarly, the sixth threshold value T6 for switching the power correction value RPc from the state of outputting the negative offset value Pcl to 0 is set to a value that is less than 0 and greater than the fourth threshold value T4 for the power amount deviation ΔRE.

[0082] Thereby, it is possible to prevent the value of the power correction value RPc from frequently switching and perform stable control.

[0083] Next, the control system of the second command SC2 for the power converter 91 will be described. As described above, the planned value table stored in the storage of the controller 6 includes data on the first power reception suppression requirement amount RQ1 for each third unit time associated with the differential power demand. Further, the value of the tolerance TI of the differential power demand is stored in the storage of the controller 6.

[0084] The limit range generation unit 64 generates an upper limit value UL from the maximum value RQ1MAX of the first power reception suppression requirement amount RQ1 in the first unit time. As described above, the first power reception suppression requirement amount RQ1 acquired by the controller 6 at the reference time [n] is the first power reception suppression requirement amount RQ1[n + 3] after the first unit time. Therefore, at the reference time [n], the planned value table includes data on the first power reception suppression requirement amounts RQ1[n], RQ1[n + 1], RQ1[n + 2], and RQ1[n + 3]. The limit range generation unit 64 extracts the maximum value RQ1MAX of the first power reception suppression requirement amount RQ1 between the reference time [n] and the time [n + 3]. The limit range generation unit 64 subtracts the value of the first power reception suppression requirement amount RQ1 acquired at the reference time [n], that is, the first power reception suppression requirement amount RQ1[n + 3] after the first unit time, from the sum of the maximum value RQ1MAX of the first power reception suppression requirement amount RQ1 in the extracted first unit time and the tolerance TI to calculate the upper limit value UL.

[0085] In the example of FIG. 4, RQ1[n]=RQ1[n + 1]=RQ1[n + 2]=P1, and RQ1[n + 3]=P2 (P2 > P1). Therefore, the maximum value RQ1MAX at the reference time [n] is P2. Therefore, the upper limit value UL at the reference time [n] is P2 + TI - P2 = TI. As described above, the upper limit value UL means the upper limit value for suppressing the demand power, and the demand power in FIG. 4 is the minimum allowable value of the power transfer target value RPo. Therefore, the upper limit value UL at the reference time [n] in FIG. 4 is UL2.

[0086] Similarly, the restriction range generation unit 64 generates a lower limit value LL from the minimum value RQ1MIN of the first power reception suppression required amount RQ1 in the first unit time. At the reference time [n], the restriction range generation unit 64 extracts the minimum value RQ1MIN of the first power reception suppression required amount RQ1 from the reference time [n] to the time [n + 3]. The restriction range generation unit 64 subtracts the tolerance TI from the minimum value RQ1MIN of the first power reception suppression required amount RQ1 in the extracted first unit time, and then subtracts the value of the first power reception suppression required amount RQ1 obtained at the reference time [n], that is, the first power reception suppression required amount RQ1[n + 3] after the first unit time from the reference time [n], to calculate the lower limit value LL.

[0087] In the example of FIG. 4, the minimum value RQ1MIN at the reference time [n] is P1. Therefore, the lower limit value LL at the reference time [n] is P1 - TI - P2 = -(TI + P2 - P1). As described above, the lower limit value LL means the lower limit value for suppressing the demand power, and the demand power in FIG. 4 is the maximum allowable value of the power transmission and reception target value RPo. Therefore, the lower limit value LL at the reference time [n] in FIG. 4 is LL1.

[0088] Similarly, for example, in the example of FIG. 4, the maximum value RQ1MAX at the time [n + 4] is P2, which is the maximum value of the first power reception suppression required amount RQ1 from the time [n + 1] to the time [n + 4]. Therefore, the upper limit value UL at the time [n + 4] is P2 + TI - P2 = TI. That is, the upper limit value UL at the time [n + 4] in FIG. 4 is also UL2. Also, the minimum value RQ1MIN at the time [n + 4] is P2, which is the minimum value of the first power reception suppression required amount RQ1 from the time [n + 1] to the time [n + 4]. Therefore, the lower limit value LL at the time [n + 4] is P2 - TI - P2 = -TI. That is, the lower limit value LL at the time [n + 4] in FIG. 4 is LL2.

[0089] In this way, the limit range generation unit 64 generates the upper limit value UL and the lower limit value LL at each time for every third unit time. The generated upper limit value UL and lower limit value LL are stored in the storage of the controller 6. In the example of FIG. 4, the combination of the upper limit value and the lower limit value up to the reference time [n] is (UL1, LL1). Similarly, the combination of the upper limit value and the lower limit value from the reference time [n] to the time [n + 3] is (UL2, LL1). Similarly, the combination of the upper limit value and the lower limit value after the time [n + 3] is (UL2, LL2).

[0090] FIG. 9 is a block diagram showing a configuration example of the second command generation unit shown in FIG. 5. The second command generation unit 65 generates a second command SC2 based on the power transfer target value RPo generated by the target value generation unit 60, the power transfer RP1 measured by the power meter 8, and the upper limit value UL and the lower limit value LL generated by the limit range generation unit 64.

[0091] The second command generation unit 65 includes a subtractor 651 that subtracts the power transfer RP1 from the power transfer target value RPo to calculate a second power deviation ΔP, and a command value calculation unit 652 that compares the second power deviation ΔP output from the subtractor 651 with the upper limit value UL and the lower limit value LL and calculates an output power command value DPo to be output as a second command.

[0092] The second power deviation ΔP, which is the value obtained by subtracting the power transfer RP1 from the power transfer target value RPo, is expressed as ΔP = RPo - RP1. The second power deviation ΔP is equal to the first power deviation ΔRP before being corrected by each correction value generated by the power deviation correction unit 63 and the state of charge correction unit 66.

[0093] The command value calculation unit 652 compares the second power deviation ΔP with the upper limit value UL and the lower limit value LL. As described above, the upper limit value UL and the lower limit value LL are updated every third unit time. When the second power deviation ΔP is greater than the upper limit value UL, the command value calculation unit 652 calculates an output power command value DPo for charging the capacitor 92. The output power command value at this time is represented by -(ΔP - UL) when the direction in which the capacitor 92 discharges, that is, the direction of outputting power to the external power system 4 via the power converter 91, is defined as positive.

[0094] When the second power deviation ΔP is smaller than the lower limit value LL, the command value calculation unit 652 generates an output power command value DPo for discharging from the capacitor 92. The output power command value DPo at this time is represented by DPo = -(ΔP - LL) when the direction in which the capacitor 92 discharges is defined as positive. When the second power deviation ΔP is between the upper limit value UL and the lower limit value LL, the command value calculation unit 652 sets the output power command value DPo to 0.

[0095] The second command generation unit 65 generates a second command SC2 including the output power command value DPo calculated by the command value calculation unit 652 and outputs it to the power converter 91. Note that the second command generation unit 65 may be configured not to generate the second command SC2 when the output power command value DPo is 0.

[0096] In the example of FIG. 4, at 9:30, which is the time [n - 2], the demand power is below UL1. In this case, the second power deviation ΔP becomes a positive value ΔP[n - 2] greater than the tolerance TI. Therefore, the command value calculation unit 652 determines that the second power deviation ΔP is greater than the upper limit value UL1 at this time and calculates an output power command value DPo = -(ΔP[n - 2] - UL1) < 0. The second command generation unit 65 generates a second command SC2 for charging the capacitor 92 by this output power command value DPo.

[0097] Also, in the example of FIG. 4, at the time of [n + 5], which is 11:15, the demand power exceeds LL2. In this case, the second power deviation ΔP becomes a negative value ΔP[n + 5] that is greater than the tolerance TI. Therefore, the command value calculation unit 652 determines that the second power deviation ΔP is smaller than the lower limit value LL2 at this time, and calculates the output power command value DPo = -(ΔP[n + 5] - LL2)>0. The second command generation unit 65 generates a second command SC2 to discharge the power storage device 92 by the amount of this output power command value DPo.

[0098] For example, in the example of FIG. 4, let the values of RPo1, RPo2, TI, RP1[n - 2], and RP1[n + 5] be the following values. Note that RP1[n - 2] is the power received and transmitted at time [n - 2], and RP1[n + 5] is the power received and transmitted at time [n + 5]. RPo1 = 10MW RPo2 = 9MW TI = 0.1MW RP1[n - 2] = 9.7MW RP1[n + 5] = 9.3MW

[0099] At this time, the second power deviation ΔP[n - 2] at time [n - 2] is 0.3MW, which is greater than the tolerance TI = 0.1MW. Therefore, the command value calculation unit 652 determines that the second power deviation ΔP is greater than the upper limit value UL1 at this time, and calculates the output power command value DPo = -(ΔP[n - 2] - UL1)=-(0.3MW - 0.1MW)= -0.2MW. As a result, the second command SC2 becomes a charge command for controlling the power converter 91 to charge the power storage device 92 by 0.2MW.

[0100] Similarly, the second power deviation ΔP[n + 5] at time [n + 5] is -0.3MW, which is smaller than the tolerance TI = -0.1MW. Therefore, the command value calculation unit 652 determines that the second power deviation ΔP is less than the lower limit value LL2 at this time, and calculates the output power command value DPo = -(ΔP[n + 5] - LL2)=-(-0.3MW - (-0.1MW)) = 0.2MW. As a result, the second command SC2 becomes a discharge command for controlling the power converter 91 to discharge the power storage device 92 by 0.2MW.

[0101] Thus, according to this embodiment, as the target value RPo of the transmitted and received power such as the differential power demand fluctuates, the output power of the power output device 2i increases or decreases, and the achievement of the target value RPo of the transmitted and received power for each second unit time is realized. Further, according to this embodiment, power compensation using the capacitor 92 is performed for fluctuations in the transmitted and received power RP1 in a time unit shorter than the second unit time. As a result, the transmitted and received power at the third connection point 30 can satisfy each demand component with respect to the received power planned value BL. Therefore, with a simple configuration, the transmitted and received power with respect to the external power system 4 of the power utilization facility 1 can be made to correspond to various supply and demand requirements without considering the responsiveness of the power output device 2i.

[0102] Also, during power compensation using the capacitor 92, when the result of the output adjustment of the power output device 2i, that is, when the transmitted and received power RP1 at the first connection point 31 exceeds the tolerance of the differential power demand, the power converter 91 is controlled to compensate for the excess in the capacitor 92. Therefore, the capacity of the capacitor 92 can be suppressed to the minimum necessary considering the response speed of the power output device 2i, the fluctuations of the load 5 connected to the power utilization facility 1, the received power planned value BL, etc.

[0103] Note that in the example of FIG. 4, an example where differential power demands continue to occur is shown. However, when no differential power demand occurs, or during a period when the differential power demand is set to be invalid, control of the power converter 91 may not be performed. Thereby, the number of times or frequency of charge and discharge of the capacitor 92 can be reduced. Therefore, power loss associated with charge and discharge can be suppressed, and deterioration of the capacitor 92 can be suppressed.

[0104] As described above, in the present embodiment, the fluctuations in the power RP1 transferred in short time units, which cannot be fully handled by adjusting the output power to the power output device 2i, are compensated for by the capacitor 92. In order to enable the power compensation by the capacitor 92 to be executed at any time, it is desirable to prevent the SOC of the capacitor 92 from deviating from the reference value. That is, for example, when the SOC is in an overcharged state where it is excessively high, charging from the external power grid 4 to the capacitor 92 cannot be performed. Also, for example, when the SOC is in an overdischarged state where it is excessively low, discharging from the capacitor 92 to the external power grid 4 cannot be performed.

[0105] Therefore, in the present embodiment, the charge state correction unit 66 generates a SOC correction value SOCc for correcting the first power deviation ΔRP based on the SOC detection value SOCd detected by the charge state detector 93. FIG. 10 is a block diagram showing a configuration example of the charge state correction unit shown in FIG. 5. The charge state correction unit 66 includes a subtractor 661 and a correction value calculation unit 662. The subtractor 661 calculates a SOC deviation ΔSOC by subtracting the SOC detection value SOCd from a predetermined SOC target value SOCo. The SOC target value SOCo is stored in advance in the storage of the controller 6.

[0106] The correction value calculation unit 662 calculates a SOC correction value SOCc from the SOC deviation ΔSOC. When the SOC deviation ΔSOC is equal to or greater than a predetermined first reference value R1, the correction value calculation unit 662 generates a charge correction value SOCcc for charging the capacitor 92 as the SOC correction value SOCc. Also, when the SOC deviation ΔSOC is less than a predetermined second reference value R2 that is less than the first reference value R1, the correction value calculation unit 662 generates a discharge correction value SOCcd for discharging from the capacitor 92 as the SOC correction value SOCc. When the SOC deviation ΔSOC is equal to or greater than the second reference value R2 and less than the first reference value R1, the correction value calculation unit 662 outputs 0 as the SOC correction value SOCc. That is, in this case, the charge and discharge related to the SOC correction of the capacitor 92 are not performed.

[0107] For example, the first reference value R1 is set to a predetermined positive value, and the second reference value R2 is set to a negative value having the same magnitude as the first reference value R1. Alternatively, the first reference value R1 may be set to a predetermined positive value, and the second reference value R2 may be set to a negative value having a magnitude different from that of the first reference value R1.

[0108] In the present embodiment, the SOC correction value SOCc is updated every third unit time. In other words, the SOC correction value SOCc is held at the same value during the third unit time. For this purpose, the state-of-charge correction unit 66 includes a correction value holding unit 663 and a timer 664. The correction value holding unit 663 holds the output of the correction value calculation unit 662 for the third unit time.

[0109] The timer 664 outputs a holding signal Sh every third unit time. The holding signal Sh is input to the correction value holding unit 663 every third unit time. The correction value holding unit 663 holds the output of the correction value calculation unit 662 at the first timing as the SOC correction value SOCc output by the state-of-charge correction unit 66 from the reception of the holding signal Sh at the first timing until the reception of the next holding signal Sh at the second timing after the elapse of the third unit time. As a result, the SOC correction value SOCc output by the state-of-charge correction unit 66 is a value updated every third unit time.

[0110] The SOC correction value SOCc generated in this way is input to the power deviation calculation unit 61 and the power deviation correction unit 63. The power deviation calculation unit 61 subtracts the SOC correction value SOCc from the power transfer target value RPo. For example, when the SOC correction value SOCc is the charge correction value SOCcc, the first power deviation ΔRP decreases by the SOC correction value SOCc. As a result, the first command SC1 is likely to become an increase command SC1u, or the first command SC1 is unlikely to become a decrease command SC1d. Therefore, the output power from the power output device 2i is promoted.

[0111] As a result, the power transfer RP1, with the receiving side from the external power system 4 to the power utilization equipment 1 being positive, tends to be lower than the power transfer target value RPo. Therefore, the second power deviation ΔP (=RPo - RP1) in the second command generation unit 65 tends to exceed the upper limit value UL. As described above, when the second power deviation ΔP exceeds the upper limit value UL, the command value calculation unit 652 calculates an output power command value DPo for charging the capacitor 92, and the capacitor 92 is charged.

[0112] On the other hand, when the SOC correction value SOCc is the discharge correction value SOCcd, the first power deviation ΔRP increases due to the SOC correction value SOCc. As a result, the first command SC1 tends to become a decrease command SC1d, or the first command SC1 tends to be less likely to become an increase command SC1u. For this reason, the output power from the power output device 2i is suppressed.

[0113] As a result, the power transfer RP1 tends to exceed the power transfer target value RPo. Therefore, the second power deviation ΔP (=RPo - RP1) in the second command generation unit 65 tends to be lower than the lower limit value LL. As described above, when the second power deviation ΔP becomes lower than the lower limit value LL, the command value calculation unit 652 calculates an output power command value DPo for discharging from the capacitor 92, and the capacitor 92 is discharged.

[0114] In this way, by adjusting the output power from the power output device 2i according to the value of the SOC of the capacitor 92, the power transfer at the third connection point 30 satisfies each required component with respect to the received power planned value BL, and the power converter 91 operates so as to bring the SOC of the capacitor 92 closer to the SOC target value SOCo. As a result, the SOC of the capacitor 92 can be maintained within a predetermined range based on the SOC target value SOCo. For this reason, power adjustment using the capacitor 92 can be continued without separately using a device for charging and discharging the capacitor 92. Furthermore, the storage capacity of the capacitor 92 can be reduced.

[0115] In addition, in the present embodiment, when the state of charge correction unit 66 determines that the SOC deviation ΔSOC is equal to or greater than the second reference value R2 and less than the first reference value R1, it outputs 0 as the SOC correction value SOCc. That is, even when the SOC deviation ΔSOC is not 0, the correction of the first power deviation ΔRP based on the SOC is not performed. By creating such a dead zone where such SOC correction is not performed, it is possible to suppress frequent charge and discharge related to the SOC correction of the capacitor 92.

[0116] The SOC correction value SOCc is also input to the power deviation correction unit 63. That is, the power transfer target value calculation unit 634 integrates the value obtained by subtracting the SOC correction value SOCc from the power transfer target value RPo to generate the power transfer target value REo. In this way, the power transfer target value REo is also generated from the value obtained by correcting the power transfer target value RPo using the SOC correction value SOCc.

[0117] In this way, when generating the power correction value RPc based on the power transfer amount RE1, by considering the SOC correction value SOCc, the SOC of the capacitor 92 can be appropriately controlled.

[0118] [Other Embodiments] From the above description, many improvements and other embodiments of the present disclosure will be apparent to those skilled in the art. Therefore, the above description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art of the manner of carrying out the present disclosure. Without departing from the spirit of the present disclosure, the details of its structure or function can be substantially changed.

[0119] For example, in the above embodiment, the case where both the first power reception suppression requirement amount RQ1 and the second power reception suppression requirement amount RQ2 are amounts that suppress the power supplied from the external power system 4 to the power utilization facility 1 with respect to the power reception power planned value BL is exemplified. However, even when the first power reception suppression requirement amount RQ1 or the second power reception suppression requirement amount RQ2 is an amount that increases the power reception power with respect to the power reception power planned value BL, the same control can be achieved by the configuration in the above embodiment.

[0120] In addition, in the above-described embodiment, the control mode when power is supplied from the external power system 4 to the power utilization facility 1, that is, the control mode of the received power, was exemplified. However, the above-described embodiment is also applicable to the control mode when the output power of the power output device 2i of the power utilization facility 1 is supplied to the external power system 4, that is, the control mode of the sold power.

[0121] There is a transaction in which the power output device 2i generates power exceeding the demand power of the power utilization facility 1 and sells the surplus power to the electric utility by reverse power flow to the system. In this case, it is necessary to reverse power flow to the system with the sold power planned value, which is the power planned with the electric utility in advance.

[0122] Also in such a case, in order to appropriately control the power RP1 exchanged with the external power system 4 with respect to the change in the power supplied to the load 5, in other words, to prevent deviation from the sold power planned value, it is necessary to control the output power of the power output device 2i according to the situation of the load 5. That is, the same problems as those in the control of the received power accompanying the DR request also occur in the control of the sold power in the power utilization facility 1.

[0123] For example, when the above configuration is used as it is and the exchanged power becomes the sold power, the same control can be performed by treating the exchanged power RP1 as a negative value. FIG. 11 is a graph showing the case where the output power of the power output device is sold in the present embodiment. Similar to the graph of FIG. 2, the demand power (received power) is a positive value, and the sold power is a negative value.

[0124] In the graph of FIG. 11, the power transfer RP1 becomes negative as it is the power sold (the power supplied to the external power system 4). The graph of FIG. 11 shows the case where there is a power selling request for the amount of power selling request RQ2 from a retail electricity business operator or the like during the period TS. In this case, the power transfer target value RPo during the period TS is the amount of power selling request (power selling target value) RQ2 for each second unit time (RPo = RQ2 (<0)). Therefore, the first power deviation ΔRP output from the power deviation calculation unit 61 is ΔRP = RQ2 - RP1 (RQ2, RP1 <0). The first command generation unit 62 generates a first command SC1 according to this first power deviation ΔRP.

[0125] With the above configuration, the power transfer RP1 is controlled to match the power transfer target value RPo equal to the power selling request amount RQ2. Also, even in this case, the power deviation correction unit 63 corrects the first power deviation ΔRP based on the amount of power, so that more appropriate control can be realized. Further, the second command generation unit 65 generates a second command SC2 for charging and discharging the capacitor 92 according to the difference between the power transfer target value RPo and the power transfer RP1. Therefore, the power transfer to and from the external power system 4 of the power utilization facility 1 can be made to correspond to various supply and demand requirements.

[0126] Thus, in the above embodiment, the same control mode can be used to control both cases where the power transfer at the third connection point 30 supplies power from the external power system 4, that is, when it takes a positive value, and when it supplies power to the external power system 4, that is, when it takes a negative value. Therefore, it is also applicable to a power utilization facility 1 where the received power can be either positive or negative, for example, selling power at night and receiving power during the day.

[0127] Note that the same control can be performed even if the power transfer at the third connection point 30 is set to a positive value when it supplies power to the external power system 4 and a negative value when it receives power from the external power system 4.

[0128] In the above-described embodiment, an aspect in which the first threshold value T1 and the second threshold value T2 are set to different values has been exemplified. However, the first threshold value T1 and the second threshold value T2 may be set to the same value (for example, 0). In this case, when the first command generation unit 62 is equal to or greater than the common threshold value as the first command SC1, it generates a decrease command SC1d, and when it is less than the common threshold value, it generates an increase command SC1u. That is, the maintenance command SC1m is not generated.

[0129] Similarly, in the above-described embodiment, the correction value generation unit 632 has been exemplified in an aspect where correction is not performed (the power correction value RPc is set to 0) when the power amount deviation ΔRE is equal to or greater than the fourth threshold value T4 and less than the third threshold value T3. However, the present invention is not limited to this. For example, the third threshold value T3 and the fourth threshold value T4 may be set to the same value. In this case, the power deviation correction unit 63 always outputs a significant power correction value RPc (≠0).

[0130] Alternatively, the third threshold value T3 and the fourth threshold value T4 may be set to different values from each other, and a hysteresis characteristic may be provided therebetween. FIG. 12 is a diagram showing another example of the input-output relationship of the correction value generation unit shown in FIG. 8. In FIG. 12, only the correction value generation unit 632B in FIG. 8 is illustrated, but the other configurations of the power deviation correction unit 63 are the same as those shown in FIG. 8.

[0131] The correction value generation unit 632B shown in FIG. 12 outputs either a positive offset value Pch or a negative offset value Pcl according to the value of the input power amount deviation ΔRE. When the power amount deviation ΔRE becomes less than the fourth threshold value T4 which is less than 0 from the state where the correction value generation unit 632B is outputting the positive offset value Pch, the correction value generation unit 632B switches the output power correction value RPc to the negative offset value Pcl. Further, when the power amount deviation ΔRE becomes equal to or greater than the third threshold value T3 which is greater than 0 from the state where the correction value generation unit 632B is outputting the negative offset value Pcl, the correction value generation unit 632B switches the output power correction value RPc to the positive offset value Pch.

[0132] Even with such a configuration, it is possible to prevent the value of the power correction value RPc from frequently switching and perform stable control.

[0133] Also, in the above embodiment, the case where the second unit time, which is the unit time of the DR request amount or the power selling request amount RQ2, and the transmission interval of the reset signal Sr sent to the power amount deviation calculation unit 631 are the same is illustrated, but they may be different from each other. For example, the transmission interval of the reset signal Sr may be a value that is an integer multiple of the second unit time.

[0134] Also, in the above embodiment, the mode in which the first reference value R1 and the second reference value R2 for calculating the SOC correction value SOCc are set to different values is illustrated, but the first reference value R1 and the second reference value R2 may be set to the same value (for example, 0). In this case, the correction value calculation unit 662 outputs the charge correction value SOCcc when the SOC correction value SOCc is equal to or greater than a common threshold value, and outputs the discharge correction value SOCcd when it is less than the common threshold value. That is, the SOC correction value SOCc does not become 0. However, even in this case, the SOC correction value SOCc is held for the third unit time by the correction value holding unit 663.

[0135] Alternatively, the first reference value R1 and the second reference value R2 may be set to different values from each other, and a hysteresis characteristic may be provided therebetween. FIG. 13 is a diagram showing another example of the input-output relationship of the correction value calculation unit shown in FIG. 10. In FIG. 13, only the correction value calculation unit 662B in FIG. 10 is shown, but the other configurations of the charge state correction unit 66 are the same as those shown in FIG. 10.

[0136] The correction value calculation unit 662B shown in FIG. 13 outputs either a charge correction value SOCcc or a discharge correction value SOCcd according to the value of the input SOC deviation ΔSOC. When the SOC deviation ΔSOC becomes less than a second reference value R2 that is less than 0 from a state where a positive charge correction value SOCcc is being output, the correction value calculation unit 662B switches the output SOC correction value SOCc to a negative discharge correction value SOCcd. Further, when the SOC deviation ΔSOC becomes greater than or equal to a first reference value R1 that is greater than 0 from a state where a negative discharge correction value SOCcd is being output, the correction value calculation unit 662B switches the output SOC correction value SOCc to a positive charge correction value SOCcc.

[0137] Even with such a configuration, it is possible to prevent the value of the SOC correction value SOCc from frequently switching and perform stable control.

[0138] Also, in the above embodiment, an example is shown in which the holding interval of the SOC correction value in the correction value holding unit 663 of the charge state correction unit 66 is the third unit time, but the present invention is not limited to this. For example, the transmission interval of the holding signal Sh from the timer 664 may be a value that is an integer multiple of the third unit time.

[0139] Also, in the above embodiment, a configuration is illustrated in which the power amount deviation calculation unit 631 calculates the power amount RE1 of power transfer from the power transfer power RP1, calculates the target power amount REo of power transfer from the target power transfer value RPo and the SOC correction value SOCc, and generates a power amount deviation ΔRE by subtracting the power amount RE1 of power transfer from the target power amount REo of power transfer. Instead of this, the power amount deviation calculation unit 631 may calculate the power amount deviation ΔRE by integrating a value obtained by subtracting the SOC correction value SOCc from the target power transfer value RPo and then subtracting the power transfer power RP1.

[0140] Also, in the above-described embodiment, the mode in which the power output device 2i outputs power based on the first command SC1 corresponding to the first power deviation ΔRP has been described. However, the power output device 2i may be controlled based on other control signals in addition to the first command SC1 corresponding to the first power deviation ΔRP. For example, in the controller 6 or other controllers, a load distribution that minimizes the fuel cost may be calculated and set, and a control command that achieves such a load distribution may be input to the power output device 2i. When the power output device 2i is being controlled based on such a control command and further receives an increase command SC1u from the controller 6, the power output device 2i may further increase the current output power.

[0141] Also, the control mode based on the first command SC1 in the above-described embodiment is applied only during the DR request period TDR set in advance as the period during which the DR request is made. In other cases, it may not be necessary to control the power utilization facility 1 using the first command SC1. Similarly, the control mode based on the second command SC2 in the above-described embodiment is applied only during the period preset as the period when the differential power request is valid. In other cases, it may not be necessary to control the power utilization facility 1 using the second command SC2. That is, the power utilization facility 1 may be configured to be able to appropriately switch between the control mode in the above-described embodiment and other control modes. In this case, during the periods other than the DR request period TDR and the valid period of the differential power request, for example, the output power of the power output device 2i may be set in an operation pattern that optimizes the fuel cost or the like. Alternatively, regardless of whether it is the DR request period TDR or not, the power utilization facility 1 may be controlled using the first command SC1. Also, regardless of whether it is the valid period of the differential power request or not, the power utilization facility 1 may be controlled using the second command SC2.

[0142] In the above embodiment, an aspect in which the first command generation unit 62 and the second command generation unit 65 are included in one controller 6 has been exemplified. However, the first command generation unit 62 may be included in the first controller, and the second command generation unit 65 may be included in the second controller. Other configurations of the controller 6, that is, the target value generation unit 60, the power deviation calculation unit 61, the power deviation correction unit 63, the limit range generation unit 64, or the state of charge correction unit 66 may be included in either the first controller or the second controller, or may be included in a third controller different from these controllers.

[0143] Also, the number of power output devices 2i connected to the first connection point 31 may be one or two or more. Also, as described above, various power output devices such as generators or capacitors can be applied to the power output device 2i connected to the first connection point 31. When a capacitor is applied as the power output device 2i, it is possible not only to simply generate power but also to charge the capacitor that is the power output device 2i. When a plurality of power output devices 2i are connected to the first connection point 31, power output devices 2i having the same responsiveness may be connected, or power output devices 2i having different responsiveness may be connected.

[0144] The capacitor 92 connected to the power converter 91 is not particularly limited. For example, the capacitor 92 may be a secondary battery or a capacitor.

[0145] Also, in the above embodiment, an aspect in which the state of charge correction unit 66 operates to maintain the SOC of the capacitor 92 within a predetermined range has been exemplified. However, the state of charge correction unit 66 may not be provided. In that case, for example, the power utilization facility 1 may separately include a charge / discharge system that charges and discharges the capacitor 92 so as to maintain the SOC of the capacitor 92 within a predetermined range. This charge / discharge system may operate in a control system different from the control system by the first command SC1 and the second command SC2.

[0146] [Summary of the present disclosure] A power utilization facility according to an aspect of the present disclosure includes at least one power output device connected to exchange power with an external power system via a predetermined first connection point, a power meter that measures the power exchanged at the first connection point, a power converter connected to exchange power with the external power system at a second connection point on the external power system side of the first connection point, a capacitor connected to the power converter, and a controller that controls the power output device and the power converter. The controller includes a target value generation unit that acquires a predetermined power exchange required value and generates a target power exchange value based on the power exchange required value, a power deviation calculation unit that acquires the power exchange measured at the first connection point and calculates a first power deviation from the value obtained by subtracting the acquired power exchange from the target power exchange value, a first command generation unit that generates a first command to increase or decrease the output power from the power output device based on the first power deviation, and a second command generation unit that generates a second command to adjust the output power from the power converter by charging and discharging the capacitor based on a second power deviation obtained by subtracting the power exchange from the target power exchange value. The first command generation unit generates a decrease command to decrease the output power when the first power deviation is equal to or greater than a predetermined first threshold value, and generates an increase command to increase the output power when the first power deviation is less than the first threshold value and less than a second threshold value. The second command generation unit generates a charge command to charge the capacitor when the second power deviation exceeds an upper limit value determined based on the power exchange required value, and generates a discharge command to discharge the capacitor when the second power deviation is less than a lower limit value determined based on the power exchange required value.

[0147] According to the above configuration, as the target value of power transmission and reception such as differential power demand fluctuates, the output power of the power output device increases or decreases, and the achievement of the target value of power transmission and reception for each second unit time is realized. Further, according to the above configuration, power compensation using a capacitor is performed for fluctuations in power transmission and reception in a time unit shorter than the second unit time. As a result, the power transmission and reception at the third connection point can satisfy each required component with respect to the received power planned value. Therefore, with a simple configuration, without considering the responsiveness of the power output device, the power transmission and reception of the power utilization facility with respect to the external power system can be made to correspond to various supply and demand requirements.

[0148] The controller includes a limit range generation unit that generates the upper limit value and the lower limit value from the power transmission and reception required value. The limit range generation unit may generate the upper limit value from the maximum value of a predetermined required component included in the power transmission and reception required value in a first unit time, and generate the lower limit value from the minimum value of the required component in the first unit time.

[0149] The power utilization facility includes a charge state detector that detects the charge state of the capacitor. The controller includes a charge state correction unit that generates a charge state correction value based on a charge state deviation obtained by subtracting the detected value of the charge state from a predetermined charge state target value, and subtracts the charge state correction value from the first power deviation to correct the first power deviation. The charge state correction unit may generate a charge correction value for charging the capacitor as the charge state correction value when the charge state deviation is equal to or greater than a predetermined first reference value, and generate a discharge correction value for discharging from the capacitor as the charge state correction value when the charge state deviation is equal to or less than the first reference value and equal to or less than a second reference value.

[0150] According to the above configuration, by adjusting the output power from the power output device according to the value of the state of charge of the capacitor, the required component included in the power transfer request value is satisfied, and the power converter operates so as to bring the state of charge of the capacitor closer to the target state of charge value. Thereby, the state of charge of the capacitor can be maintained within a predetermined range based on the target state of charge value. For this reason, power adjustment using the capacitor can be continued without separately using a device for charging and discharging the capacitor. Furthermore, the storage capacity of the capacitor can be reduced.

[0151] The controller includes a power deviation correction unit that adds a power correction value to the first power deviation to correct the first power deviation. The power deviation correction unit calculates an amount of power transfer obtained by integrating the power transfer and an amount of power transfer target value obtained by integrating the power transfer target value, and includes an amount of power deviation calculation unit that calculates a power amount deviation of the amount of power transfer with respect to the amount of power transfer target value, and a correction value generation unit that generates the power correction value from the power amount deviation. The amount of power deviation calculation unit may reset the integration of the power transfer for obtaining the amount of power transfer and the integration of the power transfer target value for obtaining the amount of power transfer target value every predetermined integration time. According to such a configuration, by adding a power correction value based on the amount of power transfer to the first power deviation based on the measured power transfer, it is possible to correct the accumulation of minute deviations that may occur when only the instantaneous value of the power transfer is controlled. Therefore, it is possible to appropriately control so that the amount of power transfer per second unit time becomes the amount of power transfer target value.

[0152] The power utilization device includes a state-of-charge detector that detects the state of charge of the capacitor. The controller generates a state-of-charge correction value based on a state-of-charge deviation obtained by subtracting the detected value of the state of charge from a predetermined state-of-charge target value, and includes a state-of-charge correction unit that subtracts the state-of-charge correction value from the first power deviation to correct the first power deviation. When the state-of-charge deviation is greater than or equal to a predetermined first reference value, the state-of-charge correction unit generates a charge correction value for charging the capacitor as the state-of-charge correction value. When the state-of-charge deviation is less than a second reference value that is less than the first reference value, the state-of-charge correction unit generates a discharge correction value for discharging the capacitor as the state-of-charge correction value. The power transfer amount may be integrated by subtracting the state-of-charge correction value from the power transfer and then integrating the result.

[0153] The first reference value and the second reference value are different values. When the state-of-charge deviation is greater than or equal to the second reference value and less than the first reference value, the state-of-charge correction unit may set the state-of-charge correction value to 0. Even when the state-of-charge deviation is not 0, by creating a dead zone where the first power deviation is not corrected according to the state of charge, it is possible to suppress frequent charge and discharge related to the correction of the state of charge of the capacitor.

[0154] When the power amount deviation is greater than or equal to a predetermined third threshold value, the correction value generation unit may generate the power correction value such that the first power deviation increases. When the power amount deviation is less than a fourth threshold value that is less than the third threshold value, the correction value generation unit may generate the power correction value such that the first power deviation decreases. According to this, even in the generation of the correction value based on the power amount deviation, since it is not necessary to measure the output power of the power output device, the system configuration in the power utilization device can be simplified.

[0155] The third threshold value and the fourth threshold value are different values. When the power amount deviation is greater than or equal to the fourth threshold value and less than the third threshold value, the correction value generation unit may set the power correction value to 0.

[0156] The first threshold value and the second threshold value are different values, and the first command generation unit may generate a maintenance command for maintaining the output power when the first power deviation is equal to or greater than the second threshold value and less than the first threshold value. Thereby, as a command for the output power, by adding a maintenance command to the decrease command and the increase command, the output power from the power output device can be made more stable. Thereby, as a command for the output power, by adding a maintenance command to the decrease command and the increase command, the output power from the power output device can be made more stable.

[0157] The power transfer request value includes a first power reception suppression requirement amount for each predetermined first unit time and a second power reception suppression requirement amount for each second unit time shorter than the first unit time. The power deviation calculation unit may calculate the power transfer target value by subtracting the first power reception suppression requirement amount and the second power reception suppression requirement amount from the power transfer planned value predetermined for each second unit time for each third unit time shorter than the first unit time and the second unit time. Alternatively, the power transfer target value may include a power selling target value for each predetermined second unit time.

[0158] The power utilization facility may include a plurality of the power output devices, and the plurality of power output devices may be connected to the external power system via a common first connection point.

[0159] The power output device may include a generator. Further, the power output device may include a capacitor.

Explanation of Signs

[0160] 1 Power utilization facility 2i (i = 1, 2, 3, …) Power output device 4 External power system 6 Controller 8 Power measuring device 30 Third connection point 31 First connection point 32 Second connection point 60 Target value generation unit 61 Power deviation calculation unit 62 First command generation unit 63 Power deviation correction unit 64 Limitation range generation unit 65 Second command generation unit 66 State of charge (SOC) correction unit 91 Power converter 92 Battery 93 State of charge (SOC) detector 631 Electric power amount deviation calculation unit 632 Correction value generation unit

Claims

1. At least one power output device connected to perform power transfer with an external power system via a predetermined first connection point; A power meter for measuring the power transferred at the first connection point; A power converter connected to perform power transfer with the external power system at a second connection point on the external power system side from the first connection point; A capacitor connected to the power converter; A controller for controlling the power output device and the power converter, comprising: The controller: A target value generation unit that acquires a predetermined power transfer required value and generates a power transfer target value based on the power transfer required value; A power deviation calculation unit that acquires the power transfer measured at the first connection point and calculates a first power deviation obtained by subtracting the acquired power transfer from the power transfer target value; A first command generation unit that generates a first command to increase or decrease the output power from the power output device based on the first power deviation; A second command generation unit that generates a second command to adjust the output power from the power converter by charging and discharging the capacitor based on a second power deviation obtained by subtracting the power transfer from the power transfer target value; Including: When the first power deviation is equal to or greater than a predetermined first threshold value, the first command generation unit generates a decrease command to decrease the output power. When the first power deviation is less than the first threshold value and less than a second threshold value, the first command generation unit generates an increase command to increase the output power. When the second power deviation exceeds an upper limit value determined based on the power transfer required value, the second command generation unit generates a charge command to charge the capacitor. When the second power deviation is less than a lower limit value determined based on the power transfer required value, the second command generation unit generates a discharge command to discharge the capacitor. A power utilization facility.

2. The controller includes a limit range generation unit that generates the upper limit value and the lower limit value from the power transfer required value, The limit range generation unit generates the upper limit value from the maximum value of a predetermined required component included in the power transfer required value acquired from the other power management system in a first unit time, and generates the lower limit value from the minimum value of the required component in the first unit time. The power utilization facility according to Claim 1.

3. Comprising a charge state detector for detecting the charge state of the capacitor The controller generates a state-of-charge correction value based on a state-of-charge deviation obtained by subtracting a detected value of the state-of-charge from a predetermined state-of-charge target value, and includes a state-of-charge correction unit that subtracts the state-of-charge correction value from the first power deviation to correct the first power deviation. When the state-of-charge deviation is greater than or equal to a predetermined first reference value, the state-of-charge correction unit generates a charge correction value for charging the electrical storage device as the state-of-charge correction value. When the state-of-charge deviation is less than the first reference value and less than a second reference value, the state-of-charge correction unit generates a discharge correction value for discharging the electrical storage device as the state-of-charge correction value. The power utilization equipment according to claim 1 or 2.

4. The controller includes a power deviation correction unit that adds a power correction value to the first power deviation to correct the first power deviation. The power deviation correction unit calculates an amount of power transmitted and received obtained by integrating the transmitted and received power and an amount of power transmitted and received target value obtained by integrating the transmitted and received power target value, and calculates a power amount deviation of the amount of power transmitted and received with respect to the amount of power transmitted and received target value, and a correction value generation unit that generates the power correction value from the power amount deviation. The power amount deviation calculation unit resets the integration of the transmitted and received power for obtaining the amount of power transmitted and received and the integration of the transmitted and received power target value for obtaining the amount of power transmitted and received target value every predetermined integration time. The power utilization equipment according to any one of claims 1 to 3.

5. It includes a state-of-charge detector that detects the state-of-charge of the electrical storage device. The controller generates a state-of-charge correction value based on a state-of-charge deviation obtained by subtracting a detected value of the state-of-charge from a predetermined state-of-charge target value, and includes a state-of-charge correction unit that subtracts the state-of-charge correction value from the first power deviation to correct the first power deviation. When the state-of-charge deviation is greater than or equal to a predetermined first reference value, the state-of-charge correction unit generates a charge correction value for charging the electrical storage device as the state-of-charge correction value. When the state-of-charge deviation is less than the first reference value and less than a second reference value, the state-of-charge correction unit generates a discharge correction value for discharging the electrical storage device as the state-of-charge correction value. The amount of power transmitted and received integrates a value obtained by subtracting the state-of-charge correction value from the transmitted and received power. The power utilization equipment according to claim 4.

6. The first reference value and the second reference value are different values. The power utilization facility according to claim 3 or 5, wherein when the state of charge deviation is equal to or greater than the second reference value and less than the first reference value, the state of charge correction value is set to 0.

7. The power utilization facility according to claim 4 or 5, wherein when the power quantity deviation is equal to or greater than a predetermined third threshold value, the correction value generation unit generates the power correction value such that the first power deviation increases, and when the power quantity deviation is less than a fourth threshold value that is less than or equal to the third threshold value, the correction value generation unit generates the power correction value such that the first power deviation decreases.

8. The third threshold value and the fourth threshold value are different values. The power utilization facility according to claim 7, wherein when the power quantity deviation is equal to or greater than the fourth threshold value and less than the third threshold value, the power correction value is set to 0.

9. The first threshold value and the second threshold value are different values. The power utilization facility according to any one of claims 1 to 8, wherein when the first power deviation is equal to or greater than the second threshold value and less than the first threshold value, the first command generation unit generates a maintenance command for maintaining the output power.

10. The power transfer request value includes a first power reception suppression request amount for each predetermined first unit time and a second power reception suppression request amount for each second unit time shorter than the first unit time. The power deviation calculation unit calculates the power transfer target value by subtracting the first power reception suppression request amount and the second power reception suppression request amount from a power transfer planned value predetermined for each second unit time for each third unit time shorter than the first unit time and the second unit time, according to any one of claims 1 to 9.

11. The power transfer target value includes a power selling target value for each predetermined second unit time, according to any one of claims 1 to 10.

12. Comprising a plurality of the power output devices. The plurality of power output devices are connected to the external power system via a common first connection point, according to any one of claims 1 to 10.

13. The power output device includes a generator, according to any one of claims 1 to 12.

14. The power output device includes a capacitor, according to any one of claims 1 to 13.

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