WO2023228264A1

WO2023228264A1 - Electric power control system

Info

Publication number: WO2023228264A1
Application number: PCT/JP2022/021196
Authority: WO
Inventors: 一彰榎島; 利記小久保; 文久神谷; 智久鋤柄; モハッメドノーマン
Original assignee: 武蔵精密工業株式会社
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2023-11-30

Abstract

The present invention enables suppression of occurrence of capacity excess/shortage of an energy storage medium while maintaining business activities of a power supply destination business office. In this electric power control system, a control unit: acquires a power generation prediction pattern for predicting the transition of generated power from a power generation device using renewable energy, in a predetermined time slot; acquires a predefined activity pattern corresponding to a predefined activity schedule of a power supply destination business office, in the predetermined time slot; determines, on the basis of the power generation prediction pattern and the predefined activity pattern, a power consumption pattern indicating the transition of power consumption of the power supply destination business office such that a charging mode for charging the energy storage medium and a discharging mode for discharging the energy storage medium are repeatedly alternated in the predetermined time slot; performs control for charging/discharging of the energy storage medium on the basis of the power generation prediction pattern and the power consumption pattern; and outputs a business activity pattern corresponding to the power consumption pattern and corresponding to a schedule different from the predefined activity pattern.

Description

power control system

The present invention relates to a power control system.

Conventionally, power control systems are known in which a power generation device using renewable energy is connected to a power supply line to which a power supply source different from the power generation device, a load, and an energy storage medium are connected. (For example, see Patent Document 1 below). A power generation device using renewable energy is a power generation device that generates power using natural energy (also referred to as “renewable energy”), such as solar power generation or wind power generation. The power supply source is, for example, a commercial power source or a fuel power generation device. A charging mode for charging the energy storage medium and a discharging mode for discharging from the energy storage medium, depending on the amount of power generated by the renewable energy generating device and the amount of power supplied from the power supply source relative to the amount of power consumed by the load. are repeated alternately.

Japanese Patent Application Publication No. 2007-60796

It is difficult to control the amount of power generated by power generation devices that use renewable energy because it is affected by changes in the natural environment. On the other hand, for example, when the power supply destination is a business entity, each business entity generally has predetermined business hours and operating hours. That is, each business entity determines its daily power consumption schedule in accordance with its business activity schedule. Therefore, depending on the time of day, there is a risk that the capacity of the energy storage medium may become excessive or insufficient, such as over-discharging or over-charging, depending on the fluctuation in the amount of power generated by the power generation device using renewable energy.

An object of the present invention is to provide a power control system that can solve the above-mentioned problems.

(1) The power control system disclosed in this specification includes a power supply line to which a renewable energy power generation device, a power supply source different from the renewable energy power generation device, and an energy storage medium are connected. A power control system connected to a power generation system, comprising a control unit, the control unit generating a power generation prediction pattern that predicts a transition in power generation from the renewable energy power generation device in a predetermined time period (within 24 hours). a power generation prediction pattern acquisition process to acquire; a default activity pattern acquisition process to acquire a predetermined activity pattern corresponding to a predetermined activity schedule of the power supply destination office during the predetermined time period; the power generation prediction pattern; and the predetermined activity pattern. Based on this, a change in power consumption of the power supply destination business office is indicated so that a charging mode for charging the energy storage medium and a discharging mode for discharging from the energy storage medium are alternately repeated during the predetermined time period. a determination process for determining a power consumption pattern; a charging control process for controlling charging and discharging of the energy storage medium based on the predicted power generation pattern and the power consumption pattern; Output processing for outputting a business activity pattern corresponding to a schedule different from the activity pattern is executed.

In this power control system, a power consumption pattern is determined based on a predicted power generation pattern and a predetermined activity pattern of a power generation device using renewable energy. This power consumption pattern is a pattern in which a charging mode and a discharging mode of the energy storage medium are alternately repeated during a predetermined time period. As a result, according to the present power control system, charging and discharging are repeated more frequently than in a configuration in which charging and discharging control of the energy storage medium does not alternately repeat the charging mode and the discharging mode. It is possible to suppress the occurrence of excess and deficiency. Further, according to this power control system, a business activity pattern corresponding to this power consumption pattern is output, so that the power supply destination business office can carry out business activities according to a schedule corresponding to this power consumption pattern.
In addition, "business activities" include not only activities for profit such as stores, factories, offices, companies, hospitals, private offices, and side jobs, but also NPOs, government offices, hospitals, schools, nursery schools, and social welfare. Includes activities such as non-profit businesses such as public works and public services of corporations.

(2) In the power control system, the control unit generates a consumption reference pattern indicating a change in power consumption of the power supply destination office during the predetermined time period based on the predetermined activity pattern, and in the determination process, The power consumption pattern may be determined so that the maximum value of the amount of charge and discharge per charge and discharge is smaller than when the charge and discharge of the energy storage medium is controlled based on the consumption reference pattern. good. In this power control system, a power consumption pattern is determined based on a predicted consumption reference pattern. Therefore, according to the present power control system, it is possible to determine an appropriate power consumption pattern based on the consumption reference pattern.

(3) In the power control system, the control unit obtains a consumption reference pattern indicating a change in power consumption of the power supply destination business office during the predetermined time period based on the predetermined activity pattern, and in the determination process, , the consumption is controlled such that the number of charging and discharging operations performed in the discharging mode and the charging mode during the predetermined time period is greater than when controlling charging and discharging of the energy storage medium based on the consumption reference pattern. A configuration may also be adopted in which the power pattern is determined. According to the present power control system, it is possible to more effectively suppress the occurrence of excess or deficiency in the capacity of the energy storage medium.

Note that the present invention can also be realized in other forms, such as a power control system, a power control method, a power control program, and a non-temporary recording medium on which the power control program is recorded.

An explanatory diagram showing the electrical configuration of a power control system 100 and an external device in an embodiment Explanatory diagram showing changes in PV power Wp of the solar power generation device 10, commercial power Wa of the commercial power source 20, and load power Wr of the load 30 Flowchart showing acquisition processing and determination processing Explanatory diagram showing the relationship between consumption reference pattern Pr, power generation prediction pattern Pp, and target power supply Wt Explanatory diagram showing the process of extraction processing of power consumption pattern Pc

A. Embodiment:
A-1. Electrical configuration of power control system 100 and external devices:
FIG. 1 is an explanatory diagram showing the electrical configuration of a power control system 100 and an external device in this embodiment. FIG. 1 shows a solar power generation device 10, a commercial power supply (system) 20, a core system (master controller) 40, a LIB module 50, and a weather forecast system 60 as external devices. The power control system 100, the solar power generation device 10, the commercial power supply 20, and the LIB module 50 are electrically connected via the power supply DC line LW, and supply power to the load 30 operating at the power supply destination business office. . Examples of the load 30 include equipment that accelerates and decelerates relatively quickly (machine tools, industrial robots, transport equipment, textiles, food processing equipment, etc.) when the power supply destination is a manufacturing business. equipment), and equipment that has a relatively large output and must operate during a power outage (elevators, air conditioners, compressors, etc.). In this embodiment, the load 30 is assumed to be equipment operated in a factory. The power supply DC line LW is an example of a power supply line in the claims.

The solar power generation device 10 is a device that generates electricity using solar power generation that converts sunlight energy into electric power, and includes a solar panel 12 and a PV converter 14. The PV converter 14 includes a power generation device sensor 14A and a DC/DC converter 14B. The power generation equipment sensor 14A is a current and voltage sensor that detects the voltage value and current value of the power generated by the solar power generation device 10, respectively, and outputs a detection signal according to the detection results. The DC/DC converter 14B performs control to maximize the power generated by the solar panel 12 based on the detection result of the power generation device sensor 14A, and supplies DC power according to the amount of power generated by the solar panel 12 to the power supply DC line. Output to LW. The DC/DC converter 14B controls the DC power to maintain a constant voltage (for example, a voltage with a higher potential than the power supply DC line LW). Hereinafter, the power output from the solar power generation device 10 will be referred to as "PV power Wp." In this embodiment, the PCU 120, which will be described later, controls the on/off operation of the DC/DC converter 14B. The solar power generation device 10 is an example of a power generation device using renewable energy in the claims.

The commercial power supply 20 is electrically connected to the power supply DC line LW via an AC/DC converter 22. AC power from the commercial power supply 20 is converted to DC power by the AC/DC converter 22 and output to the power supply DC line LW. Hereinafter, the DC power output from the commercial power source 20 will be referred to as "commercial power Wa." In this embodiment, the PCU 120 operates the AC/DC converter 22 so that the DC power output from the AC/DC converter 22 maintains a constant voltage (for example, a voltage with a higher potential than the power supply DC line LW). control. The commercial power supply 20 is an example of a power supply source in the claims.

The power control system 100 includes an LIC module 110, a PCU (POWER CONTROL UNIT) 120, a DC/DC converter 130, a capacitor sensor 140, and a load sensor 150.

The LIC module 110 has a configuration in which a plurality of lithium ion capacitors (hereinafter referred to as "LIC") 112 are connected in series. One end (for example, the positive electrode side) of the LIC module 110 is electrically connected to the load 30 via the power supply DC line LW without using a voltage converter such as a DC/DC converter. That is, in this embodiment, the potential on the one end side of the LIC module 110 and the potential on the side of the load 30 connected to the power supply DC line LW are substantially the same. The other end (for example, the negative electrode side) of the LIC module 110 is electrically connected to the common line (for example, the ground line) side.

The capacitor sensor 140 is a current/voltage sensor provided in the LIC module 110 connected in parallel to the power supply DC line LW (in other words, a current/voltage sensor provided in the current path between the LIC module 110 and the power supply DC line LW). ), detects the current value and voltage value during discharging and charging of the LIC module 110, respectively, and outputs a detection signal according to the detection results. The load sensor 150 is a current/voltage sensor provided in the current path between the LIC module 110 and the load 30 in the power supply DC line LW, and measures the voltage value of the load 30 and the current value flowing through the load 30. They are detected respectively and a detection signal corresponding to the detection result is output.

One end of the DC/DC converter 130 is electrically connected to the power supply DC line LW, and the other end of the DC/DC converter 130 is electrically connected to the connection part 132. One end (for example, the positive electrode side) of the LIB module 50 is electrically connected to the connection portion 132 . The other end (for example, the negative electrode side) of the LIB module 50 is electrically connected to the common line (for example, the ground line) side. LIB module 50 is an example of an energy storage medium in the claims.

The LIB module 50 is an energy storage medium with a lower output density (also referred to as "power density") than the LIC module 110 described above. Furthermore, the LIB module 50 has a higher energy density than the LIC module 110. In this embodiment, the LIB module 50 has a configuration in which, for example, a plurality of lithium ion batteries (hereinafter referred to as "LIB") 52 are connected in series. The LIB 52 is, for example, an iron phosphate-based LIB or a ternary-based LIB (nickel-manganese-cobalt-based, etc.). Hereinafter, the power stored in the LIB module 50 will be referred to as "storage power Ws."

The PCU 120 includes a control section 121, a storage section 122, and an interface section 123, and these sections are communicably connected to each other via a bus (not shown).

The control unit 121 is composed of, for example, a CPU, and controls each proportional charge/discharge controller by executing a computer program read from the storage unit 122. Specifically, the control unit 121 controls the operations of the AC/DC converter 22, the DC/DC converter 14B of the PV converter 14, and the DC/DC converter 130. For example, the control unit 121 reads a power control program (not shown) from the storage unit 122 and executes it, thereby executing power control processing to be described later. The control unit 121 functions as a DC/DC control unit 210, a pattern determination unit 220, a power generation prediction unit 230, a load power calculation unit 240, and a load planning unit 250 when executing power control processing. The functions of each of these parts will be explained in conjunction with explanations of various processes that will be described later.

The storage unit 122 is composed of, for example, ROM, RAM, hard disk drive (HDD), etc., and stores various data, programs, and models, and serves as a work area and temporary data storage area when executing various programs and models. It is also used as a storage area. Furthermore, the storage unit 122 stores a power control program. The power control program is a computer program for executing power control processing described below. These programs are provided, for example, stored in a computer-readable recording medium (not shown) such as a CD-ROM, DVD-ROM, or USB memory, and are stored in the storage unit 122 by being installed in the PCU 120. be done.

The interface unit 123 is configured with, for example, a LAN interface or a USB interface, and communicates with other devices by wire or wirelessly. Note that the PCU 120 detects the current, voltage, temperature, etc. of the LIC 112 in the LIC module 110 and the LIB 52 in the LIB module 50, and detects the status of the LIC 112 and LIB 52 (for example, abnormalities such as overdischarge, overcharging, and high temperature) based on the detection results. (e.g., whether a condition has occurred).

The core system 40 is an existing system used by a business office to which electricity is supplied, and is responsible for functions essential to the manufacturing industry, such as order management, shipping management, production planning management, manufacturing management, and quality control. This core system 40 is an external device that is communicatively connected to the power control system 100, and transmits various instruction information and the like to the PCU 120. The instruction information includes the predetermined activity pattern of this factory as information. Here, the predetermined activity pattern specifically refers to plan information related to the operation plan of the load 30 in a predetermined time period (for example, the operation plan of the load 30, the process in which the load 30 (machine equipment, transport equipment) is used) This includes plans (for example, production plans for products produced by a production line, delivery plans for products transported by a transportation line, etc.) and work plans for workers who use the load 30.The core system 40 is based on order information. Then, monthly, weekly, and daily planning information is created as default activity patterns to manage equipment in the factory and various business activities of employees.The instruction information includes, in addition to the default activity patterns, e.g. , a selection signal for a power control mode (for example, whether or not to generate private power) to be executed by the power control system 100.

The weather forecast system 60 is a system that provides weather information (for example, AMeDAS observation information provided by the Japan Meteorological Agency) via a communication network or the like. Weather information includes observation information of the natural environment, such as weather, temperature (daily average temperature, daily maximum temperature, daily minimum temperature), humidity, precipitation, wind direction/speed, sunshine hours, solar radiation, snow depth, etc. , includes not only the current weather conditions but also weather predictions (for example, predictions of temperature and humidity, and predictions of the amount of sunlight).

When the power control system 100 is started, the PCU 120 supplies power to the load 30 using the power supplied (PV power Wp, commercial power Wa) from the power supply unit (solar power generation device 10, commercial power source 20). While performing this, power control processing (including determination processing and the like described later) for controlling charging and discharging of the LIB module 50 is executed. Note that by controlling the charging and discharging of the LIB module 50 as described above, the charging and discharging of the LIC module 110 is indirectly controlled. Specifically, the PCU 120 executes power control processing based on a power control mode selection signal from the core system 40 and

various sensors

14A, 140, and 150. At this time, the PCU 120 controls charging and discharging of the LIB module 50 by operating the DC/DC converter 130, for example, but does not directly control charging and discharging of the LIC module 110. That is, the PCU 120 indirectly controls the charging and discharging of the LIC module 110 by controlling the charging and discharging of the LIB module 50. Note that in this specification, "charging and discharging" may mean both charging and discharging, or may mean only one of charging and discharging.

A-2. Power control processing executed by the control unit 121 of the PCU 120:
When the power control process is executed, the control unit 121 operates as a DC/DC control unit 210, a pattern determination unit 220, a power generation prediction unit 230, a load power calculation unit 240, and a load planning unit 250 at each step at a predetermined time interval. Function. Each function will be explained below.

A-2-1. Power generation prediction unit 230:
The power generation prediction unit 230 generates a power generation prediction pattern Pp in a predetermined time period (in this embodiment, from 0:00 to 24:00). The power generation prediction pattern Pp is prediction data indicating the transition of the PV power Wp (generated power) from the solar power generation device 10 in a predetermined time period. Specifically, the power generation prediction unit 230 acquires power generation correlation data Qp in a predetermined time period from the weather forecast system 60. The power generation correlation data Qp is predictive data of weather information that affects the PV power Wp of the solar power generation device 10, and in this embodiment, is predictive data of changes in solar radiation in a predetermined time period, for example. Note that the solar power generation device 10 can estimate the power generation amount from information such as the conversion characteristics, capacity, installation direction and angle of the panel, and solar radiation prediction data. The power generation prediction unit 230 generates a power generation prediction pattern Pp in a predetermined time period based on the power generation correlation data Qp. Note that the predetermined time period is preferably within 24 hours, and preferably includes a time period in which the renewable energy power generation device can generate power (in the case of the solar power generation device 10, a time period during the day).

A-2-2. Load power calculation unit 240:
The load power calculation unit 240 generates a consumption reference pattern Pr in a predetermined time period. The consumption reference pattern Pr is prediction data that indicates a change in the load power Wr (power consumption) of the load 30 during a predetermined time period. The integral value of the consumption reference pattern Pr is the required power consumption amount of the load 30 in a predetermined time period. Specifically, the load power calculation unit 240 obtains a predetermined activity pattern Qr in a predetermined time period (for example, a production plan in a predetermined time period) from the core system 40, and obtains load correlation data Qt in a predetermined time period from the weather forecast system 60. get. This acquisition process is an example of the predetermined activity pattern acquisition process in the claims. The load correlation data Qt is predicted data of weather information given to the load power Wr of the load 30, and in this embodiment, is predicted data of changes in temperature and humidity in a predetermined time period, for example. According to the predetermined activity pattern Qr, it can be converted into electric energy by multiplying it by the electric power consumption required to produce one product. Further, since there is a correlation between the temperature in a predetermined time period, the discomfort index, and the operating power consumption of the air conditioner according to the load correlation data Qt, the consumption reference pattern Pr can be treated as the amount of power. The load power calculation unit 240 generates a consumption reference pattern Pr in a predetermined time period based on the predetermined activity pattern Qr and the load correlation data Qt.

A-2-3. Pattern determining unit 220:
The pattern determination unit 220 executes an acquisition process of acquiring a power generation prediction pattern Pp and a consumption reference pattern Pr, and a determination process of determining a power consumption pattern Pc based on the acquired power generation prediction pattern Pp and consumption reference pattern Pr. do. The power consumption pattern Pc is a pattern in which the maximum value of the amount of charge and discharge per charge and discharge is smaller than when the charge and discharge of the LIB module 50 is controlled based on the consumption reference pattern Pr. The amount of charge/discharge per charge/discharge is the amount of charge/discharge for one time when either the charge mode or the discharge mode is executed.

The outline of the determination process is as follows. FIG. 2 is an explanatory diagram showing changes in the PV power Wp of the solar power generation device 10, the commercial power Wa of the commercial power source 20, and the load power Wr of the load 30. FIG. 2A shows an example of a power generation prediction pattern Pp, a supply prediction pattern Pa, and a consumption reference pattern Pr. The predicted supply pattern Pa is predicted data that indicates the transition of the commercial power Wa of the commercial power source 20 during a predetermined time period. The power generation prediction pattern Pp shown in the figure is raised by the amount of the supply prediction pattern Pa.

In the example of FIG. 2(a), the power generation prediction pattern Pp is a parabolic pattern in which the PV power Wp has a peak value around 12:00 in the daytime, and the supply prediction pattern Pa is a constant power (Waa ). The consumption standard pattern Pr is a pattern that fluctuates according to the production plan at the factory. During a time period when the total supplied power of PV power Wp and commercial power Wa (the value of the predicted power generation pattern Pp in FIG. 2(a)) is lower than the consumption reference pattern Pr, the LIB module 50 discharges electricity to compensate for the power shortage. The discharge mode is executed. In a time period in which the total supplied power exceeds the consumption reference pattern Pr, a charging mode is executed in which the LIB module 50 is charged with surplus power of the total supplied power. In FIG. 2A, a first discharge mode with a discharge amount D1a, a charge mode with a charge amount C1a, and a second discharge mode with a discharge amount D1b are alternately repeated. That is, the number of times of charging and discharging in the consumption reference pattern Pr is three times, and the maximum value of the amount of charging and discharging per one time of charging and discharging is the amount of charge C1a in the charging mode. Therefore, unless the capacity of the LIB module 50 is equal to or greater than the charge amount C1a, the capacity of the LIB module 50 will be excessive or insufficient. In addition, if the first and second discharge modes are regarded as continuous discharge and are set as one-time discharge mode, the maximum value of the charge/discharge amount per charge/discharge is the same as the one-time discharge mode. is the discharge amount (=D1a+D1b).

FIG. 2(b) illustrates a power generation prediction pattern Pp, a supply prediction pattern Pa, and a power consumption pattern Pc. In the example of FIG. 2B, the power consumption pattern Pc is a pattern obtained by sliding the consumption reference pattern Pr by a predetermined unit time (unit slide time n described below) (see the white arrow in FIG. 2). Therefore, in the consumption reference pattern Pr and the power consumption pattern Pc, the total amount of load power Wr (necessary power consumption) of the load 30 in a predetermined time period is the same. In the example of FIG. 2(b), there is a first charging mode with a charging amount C2a, a first discharging mode with a discharging amount D2a, a second charging mode with a charging amount C2b, and a second discharging with a discharging amount D2b. mode and the third charging mode with the charging amount C2c are alternately repeated. That is, the number of times of charging and discharging in the power consumption pattern Pc is five times, and the maximum value of the amount of charging and discharging per one time of charging and discharging is the amount of discharge D2b in the charging mode. This discharge amount D2b is the maximum value of the charge/discharge amount per charge/discharge (charge amount C1a, discharge amount (=D1a+D1b)). In short, when the consumption reference pattern Pr is changed to the power consumption pattern Pc, the schedule of the load power Wr of the load 30 is changed so that the number of charging and discharging in a predetermined time period increases, and as a result, the load power consumption pattern Pc in the predetermined time period is changed. The maximum value of the amount of charge and discharge per charge and discharge can be reduced while maintaining the total amount of load power Wr of 30.

Hereinafter, the acquisition process and the determination process will be specifically explained. FIG. 3 is a flowchart showing acquisition processing and determination processing. As shown in FIG. 3, the pattern determination unit 220 acquires the power generation prediction pattern Pp from the power generation prediction unit 230, and acquires the consumption reference pattern Pr from the load power calculation unit 240 (S110). The process of S110 is an example of the power generation prediction pattern acquisition process in the claims.

Next, the pattern determination unit 220 calculates the target power supply Wt based on the power generation prediction pattern Pp and the consumption reference pattern Pr (S120). The target power supply Wt is the ideal power supply (average value) to be supplied to the load 30 from a power supply source other than the solar power generation device 10 (power generation device using renewable energy). In the present embodiment, when private power generation is selected in the power control mode, the target power supply Wt is calculated by combining the commercial power Wa of the commercial power source 20 with a private power generation device (not shown, for example, a gas power generation device (fuel cell system), a gas turbine When no private power generation is selected in the power control mode, the target supply power Wt is the commercial power Wa of the commercial power source 20.

FIG. 4 is an explanatory diagram showing the relationship between the consumption reference pattern Pr, the power generation prediction pattern Pp, and the target power supply Wt. The pattern determining unit 220 calculates the average value Wra of the load power Wr from the consumption reference pattern Pr (see FIG. 4(a)), and calculates the average value Wpa of the PV power Wp from the power generation prediction pattern Pp (see FIG. 4(b)). )reference). Then, the pattern determining unit 220 calculates the target power supply Wt using the following equation 1 (see FIG. 4(c)).
<Formula 1>
"Target supply power Wt" = "Average value Wra of load power Wr" - "Average value Wpa of PV power Wp"

Next, the pattern determining unit 220 sets the variable X to an initial value (S130). It is preferable that the initial value is a value that is sufficiently large with respect to the expected charge/discharge amount of the LIB module 50. Further, the pattern determining unit 220 determines the number of slides N based on, for example, instruction information from the core system 40 (S140). The number of slides N is, for example, a value obtained by dividing the length of the predetermined time period by the unit slide time n. For example, if the length of the predetermined time slot is 24 hours and the unit slide time n is 1 hour, the number of slides N is 24, the length of the predetermined time slot is 18 hours, and the unit slide time n is 1 hour. If the slide time n is 30 minutes, the number of slides N is 36.

Next, the pattern determining unit 220 executes a process of extracting a power consumption pattern Pc. In this extraction process, the maximum value of the charge/discharge amount per charge/discharge is selected from a plurality of consumption reference patterns Pr (k=1 to N) obtained by sliding the consumption reference pattern Pr every unit slide time n. This is a process of extracting the smallest pattern.

FIG. 5 is an explanatory diagram showing the process of extracting the power consumption pattern Pc. The pattern determining unit 220 creates a consumption reference pattern Pr(k) by sliding the consumption reference pattern Pr by a unit slide time n(xk) (S210). FIG. 5A shows a consumption reference pattern Pr(k) and a power generation prediction pattern Pp (a pattern raised by the target supply power Wt). The pattern determining unit 220 calculates the charging/discharging pattern Ps(k) of the LIB module 50 based on the consumption reference pattern Pr(k) and the predicted power generation pattern Pp (S220). Specifically, the charging/discharging pattern Ps(k) can be determined by the difference between the consumption reference pattern Pr(k) and a pattern obtained by raising the power generation prediction pattern Pp by the target supply power Wt. The charging/discharging pattern Ps(k) illustrated in FIG. 5(b) is a difference pattern of the consumption reference pattern Pr(k) with respect to a pattern in which the power generation prediction pattern Pp is raised by the target supply power Wt. During a time period in which the charging/discharging pattern Ps(k) is below the reference line L, the LIB module 50 is in the charging mode, and during a time period in which the charging/discharging pattern Ps(k) is above the reference line L, the LIB module 50 is in the discharging mode. is executed.

The pattern determination unit 220 calculates the charge/discharge switching time T(k) based on the charge/discharge pattern Ps(k) (S230). The charging/discharging switching time T(k) is the time (zero crossing time) at which the charging/discharging pattern Ps(k) and the reference line L cross (see FIG. 5(c)). Furthermore, the pattern determining unit 220 calculates the absolute value U(k) of the charge/discharge amount in each charge/discharge mode (S240).

For example, as shown in FIG. 5(c), in the first time period from 0:00 to charge/discharge switching time T(k)a, the first charging mode is executed, and the charging/discharging in the first time period is performed. The area of the region defined by the pattern Ps(k) and the reference line L is the absolute value U(k)a of the charge/discharge amount in the first charging mode. In the second time period from charge/discharge switching time T(k)a to charge/discharge switching time T(k)b, the first discharge mode is executed, and the charging/discharging pattern Ps(k) in the second time period is The area of the region defined by and the reference line L is the absolute value U(k)b of the amount of charge and discharge in the first discharge mode. In the third time period from charge/discharge switching time T(k)b to charge/discharge switching time T(k)c, the second charging mode is executed, and the charging/discharging pattern Ps(k) in the third time period is The area of the region defined by the reference line L and the reference line L is the absolute value U(k)c of the amount of charge and discharge in the second charging mode. In the fourth time period from charge/discharge switching time T(k)c to charge/discharge switching time T(k)d, it is the second discharge mode, and the charging/discharging pattern Ps(k) in the fourth time period is The area of the region defined by the reference line L is the absolute value U(k)d of the amount of charge and discharge in the second discharge mode. In the fifth time period from charge/discharge switching time T(k)d to 0:00, the third charging mode is executed, and the charging/discharging pattern Ps(k) in the fifth time period and the reference line L are used to perform the third charging mode. The area of the region is the absolute value U(k)e of the amount of charging and discharging in the third charging mode. Note that in this embodiment, the charging mode executed in the first time period and the fifth time period is one charging mode, and the absolute value U(k) of the charge/discharge amount in the first charging mode is The sum of a and the absolute value U(k)e of the charge/discharge amount in the third charging mode is defined as the absolute value U(k) of the charge/discharge amount in the first charging mode.

The pattern determination unit 220 calculates the maximum value U(k)max of the absolute value U(k) of the charge/discharge amount per charge/discharge in the charge/discharge pattern Ps(k) (S250). In the example of FIG. 5(c), the absolute value U(k)d of the amount of charge and discharge in the second discharge mode is the maximum value U(k)max.

Next, the pattern determining unit 220 determines whether the calculated maximum value U(k)max is smaller than the variable X (S260). If the maximum value U(k)max is smaller than the variable X (S260: Yes), the value of the variable The unit slide time n×k) is stored in the storage unit 122 (S270), and the process proceeds to S280. On the other hand, if the maximum value U(k)max is greater than or equal to the variable X (S260: No), the process proceeds to S280 without performing the process of S270.

In S280, the pattern determining unit 220 determines whether the processes from S210 to S270 described above have been performed for all of the plurality of consumption reference patterns Pr (k=1 to N). If there remains a consumption reference pattern Pr that has not been executed yet (k<N S280: No), add 1 to the count k, return to S210, and repeat the above process for the next consumption reference pattern Pr (k+1). . On the other hand, if the execution is performed for all of the consumption reference patterns Pr (k=N S280: Yes), the pattern determining unit 220 selects the most recent value of the variable X and the charging/discharging pattern finally stored in the storage unit 122 Ps(k) and the total slide time kn are output (S150), and the main acquisition process and determination process are ended. Note that the processing from S120 to S280 is an example of the determination processing in the claims.

A-2-4. Load planning section 250:
The load planning unit 250 obtains the most recent value of the variable X and the total sliding time kn output by the pattern determining unit 220. The load planning unit 250 corrects the predetermined activity pattern Qr based on the most recent value of the variable Output to. This process is an example of the output process in the claims. The corrected business activity pattern Qm includes the power consumption pattern Pc. The power consumption pattern Pc is a consumption reference pattern Pr(k) that is slid by a total sliding time kn with respect to the consumption reference pattern Pr(0) (the consumption reference pattern Pr outputted by the load power calculation unit 240). Further, for example, in a factory or the core system 40, the required capacity of the LIB module 50 can be grasped based on the most recent value of the variable X.

A-2-5. DC/DC control unit 210:
The DC/DC control unit 210 acquires the charging/discharging pattern Ps(k) output by the pattern determining unit 220, and executes charging control processing to control charging/discharging of the LIB module 50 based on the charging/discharging pattern Ps(k). do. As a result, charge/discharge control is performed on the LIB module 50 in which the maximum value of the amount of charge/discharge per charge/discharge is suppressed to be equal to or less than the value of the most recent variable X.

A-3. Effects of this embodiment:
According to the power control system 100 according to the present embodiment, the power consumption pattern Pc of the load 30 (load schedule ) is determined. This makes it possible to ensure the necessary amount of power consumption for the load 30 while suppressing the occurrence of excess or deficiency in the capacity of the LIB module 50. Furthermore, it becomes possible to use an inexpensive LIB module 50 with a relatively small capacity. Furthermore, compared to a configuration that does not use the consumption reference pattern Pr, it is possible to determine an appropriate power consumption pattern Pc based on the consumption reference pattern Pr.

B. Variant:
The present invention is not limited to the above-described embodiments, and can be modified in various forms without departing from the gist thereof. For example, the following modifications are also possible.

The configuration of the power control system 100, etc. in the above embodiment is just an example, and can be modified in various ways. For example, in the embodiment described above, the solar power generation device 10 is illustrated as an example of a power generation device using renewable energy. A power generation device using renewable energy may also be used. Further, although the commercial power source 20 is illustrated as an example of the power supply source, a power generation device that does not use renewable energy (a power generation device that does not use renewable energy) such as a gas generator may be used. The power supplied from the power supply source may not be constant. Note that the power supply source can control the power supplied (for example, at a constant voltage) to the extent that renewable energy is not used, compared to a power generation device using renewable energy. Therefore, the power supply source suppresses the influence of fluctuations in the power generated by the renewable energy power generation device, and the degree of freedom in charging and discharging planning can be improved.

In the above embodiment, the power control system 100 does not need to include the LIC module 110. The power control system 100 may be configured to include at least one of the AC/DC converter 22, the DC/DC converter 14B, and the DC/DC converter 130. Further, a plurality of power control systems 100 may be connected in series or in parallel for use. Furthermore, since the plurality of devices (LIC module 110, DC/DC converter 130, etc.) constituting the power control system 100 are connected to a common power supply DC line LW, these devices are connected in parallel with each other. It is connected. However, when a plurality of power control systems 100 are connected, there may be devices connected in series.

In the above embodiment, the LIC module 110 may have a configuration in which a plurality of LICs 112 are connected in parallel, a configuration in which a plurality of LICs 112 are connected in series and in parallel, or a configuration in which only one LIC 112 is provided. Further, in the above embodiment, the LIC module 110 (LIC 112) is used as an example of the capacitor, but an electric double layer capacitor (EDLC) or an electrolytic capacitor may be used, for example.

In the above embodiment, the LIB module 50 may have a configuration in which a plurality of LIBs 52 are connected in parallel, a configuration in which a plurality of LIBs 52 are connected in series and in parallel, or a configuration in which only one LIB 52 is provided. Further, in the above embodiment, the LIB module 50 (LIB 52) is used as an example of the energy storage medium, but other types of power storage devices such as lead-acid batteries may be used. Furthermore, the energy storage medium is not limited to a power storage device that stores power, but may also be a device that stores energy other than power, converts the energy into power, and outputs the power, such as hydrogen storage.

In the embodiment described above, the potential on the one end side of the LIC module 110 and the potential on the side of the load 30 connected to the power supply DC line LW are approximately the same, but the potential on the one end side of the LIC module 110 is approximately the same. A configuration may be adopted in which the potential of the load 30 and the potential of the side connected to the power supply DC line LW are different, and the difference between the two potentials does not fluctuate. Even with this configuration, the LIC module 110 has a higher correlation between voltage and capacity than the LIB module 50, so it can control charging and discharging of the LIB module 50 without having a dedicated DC/DC converter. By doing so, charging and discharging of the LIC module 110 can be indirectly controlled.

In the above embodiment, the control unit 121 may be an integrated control device or may be composed of a plurality of control devices, and each of the plurality of control devices includes a DC/DC control unit 210, a pattern determination unit 220, a power generation prediction unit, and a power generation prediction unit. The functions of section 230, load power calculation section 240, and load planning section 250 may be distributed and assigned. For example, one control device may function as the DC/DC control section 210, and the other control devices may function as the pattern determination section 220, the power generation prediction section 230, the load power calculation section 240, and the load planning section 250. .

In the above embodiment, the power generation prediction unit 230 (control unit 121) predicts the amount of power generation in the future (the next day, etc.) based on weather information (for example, weather forecast) obtained via a communication network etc., and creates a power generation prediction pattern Pp. However, the power generation prediction unit 230 stores, for example, data related to the weather of the environment in which the solar power generation device 10 is installed in the storage unit 122, and the power generation prediction unit 230 predicts the amount of power generation based on this data related to the weather. You may. The weather-related data is, for example, data created from past results regarding the correspondence between environmental information (temperature, atmospheric pressure, wind power, etc.) that affects the climate and the amount of power generation. Further, the power generation prediction unit 230 may sequentially acquire and accumulate environmental information and power generation amount, and predict the future power generation amount by machine learning based on the accumulated big data.

The contents of various processes in the above embodiment are merely examples, and can be modified in various ways. In the above embodiment, the power consumption pattern Pc determined in the determination process is a pattern obtained by sliding the consumption reference pattern Pr by a predetermined time, but the power consumption pattern Pc is not limited to this, and the power consumption pattern Pc determined in the determination process is A pattern may be used in which the peak value, shape, etc. of the pattern are changed while ensuring the required amount of power consumption. In addition, the power consumption pattern Pc is a pattern in which the number of charging and discharging operations in a predetermined time period is larger than that of the consumption reference pattern Pr. The number of times of charging and discharging in a time period may be the same or may be fewer. In addition, in the above determination process, the pattern with the smallest maximum value of the charge/discharge amount per charge/discharge is extracted from the plurality of consumption reference patterns Pr, but the As long as the maximum value of the amount of charge and discharge per time is small, the pattern does not have to have the smallest maximum value of the amount of charge and discharge per time.

In the above embodiment, the predetermined activity pattern is plan information related to the factory operation plan, but for example, if the power supply destination is the information and communication industry, the predetermined Equipment operation plans, etc. fall under the predefined activity pattern. In this case, the communication carrier can change the data processing time or optimize the operation schedule of bases and machines based on the business activity pattern output by the power control system of the present invention. Alternatively, if the power supply destination is a delivery service business, the predetermined activity pattern includes a predetermined delivery plan, physical distribution volume, electric vehicle operation plan, etc. In this case, the delivery service provider can optimize the delivery destination and delivery time based on the business activity pattern output by the power control system of the present invention.

Furthermore, the power consumption pattern is determined based on the power generation prediction pattern Pp of the solar power generation device 10 and the required power consumption of the load 30, not only the power consumption pattern Pc in which the maximum value of the amount of charge and discharge per charge is small. Any pattern that has been used will suffice. The power consumption pattern here is a pattern in which the LIB module 50 alternately repeats a charging mode and a discharging mode (for example, discharging mode → charging mode → discharging mode, or charging mode → discharging mode → charging mode). According to a power control system that uses such a power consumption pattern, the required power consumption of the load 30 can be secured, compared to a configuration in which charging and discharging modes of the LIB module 50 are not alternately repeated, for example, in charging and discharging control of the LIB module 50. At the same time, it is possible to suppress the occurrence of excess or deficiency in the capacity of the LIB module 50.

In the above embodiments, a part of the configuration realized by hardware may be replaced with software, or conversely, a part of the configuration realized by software may be replaced by hardware.

10: Solar power generation device 12: Solar panel 14: PV converter 14A: Power generation equipment sensor 14B: DC/DC converter 20: Commercial power supply 22: AC/DC converter 30: Load 40: Core system 50: LIB module 52: LIB 60 : Weather forecast system 100: Power control system 110: LIC module 112: LIC 120: PCU 121: Control section 122: Storage section 123: Interface section 130: DC/DC converter 132: Connection section 140: Capacitor sensor 150: Load sensor 210 :DC/DC control unit 220: Pattern determination unit 230: Power generation prediction unit 240: Load power calculation unit 250: Load planning unit L: Reference line LW: Power supply DC line Pa: Supply prediction pattern Pc: Power consumption pattern Pp: Power generation Predicted pattern Pr: Consumption standard pattern Ps: Charge/discharge pattern

Claims

A power control system connected to a power supply line to which a renewable energy power generation device, a power supply source different from the renewable energy power generation device, and an energy storage medium are connected,
Equipped with a control unit,
The control unit includes:
A power generation prediction pattern acquisition process that acquires a power generation prediction pattern that predicts the transition of power generated by the renewable energy power generation device in a predetermined time period (within 24 hours);
a predetermined activity pattern acquisition process that obtains a predetermined activity pattern corresponding to a predetermined activity schedule of the power supply destination office during the predetermined time period;
The power supply is configured to alternately repeat a charging mode for charging the energy storage medium and a discharging mode for discharging from the energy storage medium during the predetermined time period based on the predicted power generation pattern and the predetermined activity pattern. a decision process that determines a power consumption pattern that indicates trends in power consumption at the destination business office;
a charging control process that controls charging and discharging of the energy storage medium based on the power generation prediction pattern and the power consumption pattern;
outputting a business activity pattern corresponding to the power consumption pattern and corresponding to a schedule different from the predetermined activity pattern;
Power control system.
The power control system according to claim 1,
The control unit includes:
Based on the predetermined activity pattern, generate a consumption reference pattern indicating a change in power consumption of the power supply destination business office during the predetermined time period;
In the determination process, the power consumption pattern is determined so that the maximum value of the amount of charge and discharge per charge and discharge is smaller than when the charge and discharge of the energy storage medium is controlled based on the consumption reference pattern. do,
Power control system.
The power control system according to claim 1 or 2,
The control unit includes:
Based on the predetermined activity pattern, generate a consumption reference pattern indicating a change in power consumption of the power supply destination business office during the predetermined time period;
In the determination process, the number of charging and discharging operations performed in the discharging mode and the charging mode during the predetermined time period is greater than when controlling charging and discharging of the energy storage medium based on the consumption reference pattern. determining the power consumption pattern as follows;
Power control system.