JP2017038432A - Control device, system, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase total power generated in one day by effectively using power generated in an output suppression period.SOLUTION: A control device comprises a power generation prediction unit and a storage control unit and controls an energy storage device capable of storing power of a power generation facility operated in linkage with a power system, in a predetermine form. The power generation prediction unit, on the basis of power generation variation factor information, predicts power generated in each time zone by a power generation device included by the power generation facility. The storage control unit, on the basis of a prediction result of the power generation prediction unit and output suppression information, controls the energy storage device. The power generation variation factor information includes information showing a factor that causes variations in power generated in respective time zones. The output suppression information shows an output suppression period in which power output from the power generation facility to the power system is suppressed. The storage control unit, before the output suppression period, makes storage energy in the predetermined form stored in the energy storage device be discharged; and, in the output suppression period, makes generated power be stored in the predetermined form in the energy storage device.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a control device that controls an energy storage device.

  In recent years, the increase in distributed power sources such as solar power plants has affected the supply and demand balance of the power system. For example, if photovoltaic power generation is actively performed on a day when power demand is low, such as during a large holiday, the amount of power that flows backward to the power system increases, which may cause power surplus in the power system. In order to prevent an adverse effect (for example, voltage rise) on the power system due to this surplus of power, the power system operator (for example, a power company) has the authority to suppress output such as disconnecting a photovoltaic power plant from the power system. Have. On the other hand, the amount of power generated by the photovoltaic power plant increases and decreases due to solar radiation and weather (for example, the effects of clouds in the morning and evening solar radiation fluctuations and weather changes), so that the power that flows backward to the power grid fluctuates rapidly. There is. When a solar power plant is newly installed in order to reduce the influence on the power system due to such short-term output fluctuations, the output fluctuation for one minute using a power storage device or the like is, for example, 1 [% of the rated power. / Min] is required to be relaxed.

  As an example of the prior art related to the present invention, Patent Document 1 teaches a power generation system including a solar cell and a power storage device. In this power generation system, when the system voltage rises due to the reverse power flow of excessive power to the power system, the reverse power flow is stopped and the power storage device is charged with the generated power.

Japanese Patent No. 5738212

  However, when the solar power plant is disconnected from the power system, the generated power may be limited during the disconnection period. In this case, the power that should have been generated cannot be sold to the power system. Therefore, the power generation efficiency is lowered, and the profit of the solar power plant is also reduced by reducing the power that can be sold. In this disconnection period, for example, a power storage device for relaxing / absorbing output fluctuation, for example, is not used and charging / discharging operation is not performed.

  With respect to such a problem, Patent Document 1 does not mention a case where the photovoltaic power plant is disconnected from the power system. Moreover, in patent document 1, since generated electric power is charged to an electrical storage apparatus according to the raise of a system voltage, when the charging rate of an electrical storage apparatus is high, the electric power which can be charged decreases or cannot be charged.

  In view of the above situation, an object of the present invention is to increase the overall generated power of one day by effectively using the generated power during the output suppression period.

  In order to achieve the above object, a control device according to an aspect of the present invention is a control device that controls an energy storage device capable of storing in a predetermined form the power of a power generation facility that is interconnected with a power system. A power generation prediction unit that predicts power generation for each time zone of the power generation device of the facility based on power generation fluctuation factor information, and a storage control unit that controls the energy storage device based on the prediction result and output suppression information in the power generation prediction unit And the power generation fluctuation factor information includes information indicating a factor that causes the generated power to fluctuate every day and every time zone, and the output suppression information includes an output suppression period in which the power output from the power generation facility to the power system is suppressed. The storage control unit releases the stored energy in a predetermined form stored in the energy storage device before the output suppression period, and generates the generated power during the output suppression period. It is configured to be stored in a predetermined form.

  The control device further includes a target setting unit that sets a target value of the stored energy for each time zone based on the prediction result of the power generation prediction unit and the output suppression information, and the storage control unit sets the target value in each time zone. And the target setting unit controls the stored energy of the energy storage device based on the second target value in the second time zone immediately before the first time zone than the first target value in the first time zone including the output suppression period. May be configured to be set low.

  In the above control device, the output suppression period may include a disconnection period in which the power generation facility is disconnected from the power system.

  Further, in the above control device, the storage control unit controls the energy storage device further based on at least one of the power demand information and the electricity rate information, and the power demand information requires a power load connected to the power generation facility. A predicted value of power consumption for each time zone may be indicated, and the electricity rate information may be configured to indicate a rate for each time zone of power supplied by the power system to at least one of the power generation facility and the power load.

  In the above control device, the power generation device is a solar power generation device, and the power generation variation factor information includes calendar information and weather information indicating a weather forecast in a region including a place where the power generation device is installed for each time zone. The structure containing these may be sufficient.

  Further, in the above control device, the energy storage device may be configured to be able to store the power generated by converting the power of the power generation facility into a form other than the power.

  Alternatively, in order to achieve the above object, a control device according to an aspect of the present invention is a control device that controls an energy storage device capable of storing in a predetermined form the power of a power generation facility that is interconnected with a power system. A storage unit that stores power generation fluctuation factor information including information indicating factors that cause the generated power to fluctuate in each time zone; A power generation prediction unit, and a storage control unit that controls the energy storage device based on a prediction result of the power generation prediction unit, and the storage unit suppresses the output of the reverse power flow output from the power generation facility to the power system. When the output suppression information indicating whether or not there is a period is further stored and the output suppression information indicates that there is an output suppression period, the storage control unit stores the energy storage device in a predetermined form before the output suppression period. When the reverse flow power is suppressed during the output suppression period and the storage control unit stores the generated power in the energy storage device in a predetermined form and the output suppression information indicates that there is no output suppression period, the reverse power flow is It is set as the structure which is not suppressed.

  In order to achieve the above object, a control program according to an aspect of the present invention executes a process for controlling an energy storage device capable of storing in a predetermined form the power of a power generation facility that is interconnected with a power system. The control program is for predicting the generated power for each time zone based on the power generation variation factor information including information indicating the factor that causes the power generated by the power generation equipment of the power generation equipment to vary for each time zone. And a step of controlling the energy storage device based on a prediction result in the predicting step and output suppression information indicating an output suppression period in which power output from the power generation facility to the power system is suppressed. And the step of controlling the energy storage device releases a predetermined form of stored energy stored in the energy storage device in a time zone before the output suppression period. It is a step of the steps to be stored in a predetermined form the generated power to the energy storage device at an output suppression period, configured to include.

  According to the present invention, it is possible to increase the overall generated power for one day by effectively using the generated power during the output suppression period.

It is a block diagram which shows the 1st structural example of a solar energy power generation system. It is a flowchart for demonstrating the power control process in a 1st structural example. It is a graph which shows the example of charging / discharging control of the electrical storage apparatus in 1st Embodiment. It is a block diagram which shows the 2nd structural example of a solar energy power generation system. It is a flowchart for demonstrating the electric power control process in a 2nd structural example. It is a graph which shows the example of charging / discharging control of the electrical storage apparatus in 2nd Embodiment. It is a graph which shows the example of charging / discharging control of the electrical storage apparatus in 3rd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram illustrating a first configuration example of the solar power generation system 100. The photovoltaic power generation system 100 is a power generation facility used as an industrial distributed power source, and is electrically connected to, for example, the commercial power system CS and the power load system LS via a single-phase three-wire power path P. In this solar power generation system 100, the grid connection operation by the solar cell string 1, the power storage device 2, and the commercial power system CS is possible. That is, in the photovoltaic power generation system 100, the generated power is converted from direct current to alternating current, and the power is reversely flowed (output) to the commercial power system CS via the energization path P to sell the power to an electric power company. It is possible. In the following, power that is reversely flowed (sold) to the commercial power system CS via the power path P is referred to as reverse power, and power that is supplied (purchased) from the commercial power system CS to the power path P is received. Called electric power.

  The energization path P includes the first energization path Pa and the second energization path Pb. The first current path Pa is connected to the power conditioner 3 of the solar power generation system 100. Hereinafter, the power conditioner 3 is referred to as a PCS (Power Conditioning System) 3.

  The second energization path Pb is connected to the commercial power system CS. An electricity meter M is provided in the second energization path Pb. The watt-hour meter M is a power detector that detects the direction in which power flows in the second energization path Pb, the power amount, and the power value, and outputs a detection signal indicating the detection result to the PCS 3. For example, the watt-hour meter M indicates that the solar power generation system 100 is selling power to the commercial power grid CS when power flows from the solar power generation system 100 toward the commercial power grid CS in the second conduction path Pb. Detects the amount and value of reverse flow power. The watt-hour meter M further purchases the photovoltaic power generation system 100 from the commercial power grid CS when power flows from the commercial power grid CS toward the photovoltaic power generation system 100 and / or the power load grid LS in the second conduction path Pb. It detects that the power is being received and the amount and value of the received power.

  In addition, the power load system LS is connected between the first energization path Pa and the second energization path Pb. The power load system LS is a load device such as a household appliance or a factory equipment, and consumes power supplied from the first current path Pa and / or the second current path Pb. Hereinafter, the power supplied to and consumed by the power load system LS is referred to as power consumption.

  Next, the solar cell string 1 is a power generation device including a plurality of solar cell modules connected in series. The solar cell string 1 generates power by receiving sunlight and outputs the generated DC power to the PCS 3. Hereinafter, the power output from the solar cell string 1 to the PCS 3 is referred to as generated power. In addition, the number of the solar cell strings 1 provided in the solar power generation system 100 is not limited to the illustration of FIG. 1, A plurality may be sufficient. For example, a plurality of solar cell strings 1 connected in parallel to each other may be connected to the PCS 3 (particularly, a DC / DC converter 31 described later). In this case, each solar cell string 1 may be connected to the PCS 3 via a backflow prevention device that prevents a reverse current from flowing through the solar cell string 1. Further, the solar cell string 1 may include one solar cell module.

  The power storage device 2 is an energy storage device that can store the electric power of the photovoltaic power generation system 100 that is interconnected with the commercial power system CS in an electrical form, and has a charge / discharge function that can be repeatedly charged and discharged. For example, power storage device 2 can charge (store) DC power supplied from PCS 3, and can discharge (discharge) DC power to PCS 3 according to the charging rate, that is, SOC (state of charge). Note that SOC indicates the ratio of the charge amount to the charge capacity of the power storage device 2. Hereinafter, power supplied from the PCS 3 to the power storage device 2 during charging is referred to as charging power, and power output from the power storage device 2 to the PCS 3 during discharging is referred to as discharge power. In addition, the structure of the electrical storage apparatus 2 is not specifically limited. For example, the power storage device 2 may include a secondary battery such as a lithium secondary battery, a nickel hydride battery, a nickel cadmium battery, and a lead battery. Alternatively, the power storage device 2 may include an electric double layer capacitor. Moreover, the number of the electrical storage apparatuses 2 is not limited to the illustration of FIG. 1, A plurality may be sufficient.

  The power storage device 2 includes an input / output power detection unit 21. The input / output power detection unit 21 detects the charge / discharge operation (charge, discharge, charge / discharge stop) of the power storage device 2 and its state. For example, the input / output power detection unit 21 detects the charging operation of the power storage device 2 and the power value of the charging power, the discharging operation and the power value of the discharging power, and the stop of the charging / discharging operation. These detection results are output from the power storage device 2 to the PCS 3 by a state notification signal. In addition, the charging / discharging operation | movement of the electrical storage apparatus 2 and the detection method of the state are not specifically limited. For example, the input / output power detection unit 21 may detect a change in current input to and output from the power storage device 2. In this case, the input / output power detection unit 21 detects the charge / discharge operation of the power storage device 2 based on the direction in which current flows between the PCS 3 and the power storage device 2. The input / output power detection unit 21 can detect the power value of the charging power or the discharging power by using the change in the current value and the nominal voltage of the power storage device 2.

  The PCS 3 is a control device provided between the solar cell string 1 and the power storage device 2 and the commercial power system CS. In normal times, the PCS 3 controls the operating voltage (operating point) of the solar cell string 1 so that the generated power is maximized, for example, by MPPT (Maximum Power Point Tracking) control. However, when it is necessary to limit the amount of power generated by the solar cell string 1, the PCS 3 sets the operating voltage of the solar cell string 1 to a value that deviates from the maximum output operating voltage and adjusts the generated power. In addition, the PCS 3 can also control the charge / discharge function of the power storage device 2. For example, the PCS 3 can supply charging power to the power storage device 2 to charge it, or discharge the power storage device 2 to receive supply of discharging power.

  The PCS 3 includes a DC / DC converter 31, an inverter 32, a bidirectional DC / DC converter 33, a smoothing capacitor 34, a communication unit 35, a storage unit 36, and a CPU (central processing unit) 37. The DC / DC converter 31, the inverter 32, and the bidirectional DC / DC converter 33 are connected to each other via a bus line BL.

  The DC / DC converter 31 is provided between the solar cell string 1 and the bus line BL, converts the generated power of the solar cell string 1 into DC power having a predetermined voltage value, and outputs it to the bus line BL. The DC / DC converter 31 also functions as a backflow prevention device that prevents reverse current from flowing through the solar cell string 1.

  The inverter 32 is a power conversion unit controlled by the CPU 37, and is provided between the bus line BL and the first current path Pa. The inverter 32 can perform unidirectional power conversion as shown in FIG. 1 by PWM (Pulse Width Modulation) control or PAM (Pulse Amplitude Modulation) control. That is, the inverter 32 converts the DC power (at least one of the generated power and the discharged power of the power storage device 2) input from the bus line BL to an AC frequency according to the power standards of the commercial power system CS and the power load system LS. DC / AC conversion into AC power can be performed and output to the first current path Pa. In the following description, the power conversion of the power input from the bus line BL by the inverter 32 and output to the first current path Pa is referred to as power conversion in the reverse conversion direction b. Furthermore, the power conversion in the reverse conversion direction b is called reverse conversion, and the power conversion amount of the power to be reverse converted is called reverse conversion amount.

  The bidirectional DC / DC converter 33 is a charge / discharge power conversion unit controlled by the CPU 37 and is provided between the bus line BL and the power storage device 2. The bidirectional DC / DC converter 33 can DC / DC convert DC power input from the bus line BL into DC charging power suitable for the power storage device 2 and output the DC power to the power storage device 2. The bidirectional DC / DC converter 33 can also DC / DC convert the discharge power of the power storage device 2 into power corresponding to the specifications of the inverter 32 and output the power to the bus line BL. In the following description, the bidirectional DC / DC converter 33 converts the power input from the bus line BL into power and outputs it to the power storage device 2 as power conversion in the charging direction A. Furthermore, the power conversion in the charging direction A is referred to as charge conversion, and the power conversion amount of the power for charge conversion is referred to as the charge conversion amount. The bidirectional DC / DC converter 33 converting the discharge power of the power storage device 2 into power and outputting it to the bus line BL is called power conversion in the discharge direction B. Furthermore, the power conversion in the discharge direction B is called discharge conversion, and the power conversion amount of the power to be discharged is called discharge conversion amount.

  The smoothing capacitor 34 is connected to the bus line BL, and removes or reduces fluctuations in the bus voltage value of the power flowing through the bus line BL.

  The communication unit 35 is a communication interface that performs wireless communication or wired communication with the controller 4.

  The storage unit 36 is a storage medium that holds stored information non-temporarily without supplying power. The storage unit 36 stores control information, programs, and the like used by each component (particularly the CPU 37) of the PCS 3. For example, the storage unit 36 stores target value information, power generation fluctuation factor information, output suppression information, power demand information, and electricity rate information.

  In the target value information, the SOC target value of the power storage device 2 for each time zone of each day, the update date and time of the target value information, and the like are set. Hereinafter, this target value is referred to as a target SOC. The power generation variation factor information includes information (calendar information, weather information, etc.) indicating factors that cause the generated power of the solar cell string 1 to vary from day to day and from time to time. The calendar information is information related to the calendar, and particularly shows the sunrise time, sunset time, and the like at the place where the solar cell string 1 is installed. The weather information shows the weather forecast in the area including the place where the solar cell string 1 is installed for each time zone.

  The output suppression information is usually notified in advance from a power supply company (such as an electric power company) that operates and manages the commercial power grid CS. In the output suppression information, the presence or absence of an output suppression period is set. The output suppression period is a period in which the reverse flow power sold from the photovoltaic power generation system 100 to the commercial power system CS is limited (output suppression). In addition, when the output suppression information is set to have an output suppression period, the output suppression period (date and time zone) and the content of output suppression are set in association with each other, and PCS3 corresponds to the output suppression period. Execute output suppression for the contents to be processed. If the output suppression period is set in the output suppression information, the PCS 3 does not execute output suppression. The output suppression period includes a disconnection period in which the photovoltaic power generation system 100 is disconnected from the commercial power system CS. The output suppression information may be acquired from the server of the power supply company via the network NT, or may be appropriately set at an arbitrary timing according to user input.

  The power demand information indicates a predicted value of power consumption for each predicted time zone of the power load system LS. The predicted value is set to a value predicted based on the past power consumption history of the power load system LS. The electricity charge information indicates a charge for each time zone of power purchased from the commercial power grid CS or power sold to the commercial power grid CS.

  The CPU 37 is a computer unit that controls each component of the PCS 3 using control information, a program, and the like stored in the storage unit 36. The CPU 37 has a power monitoring unit 371, a power storage monitoring unit 372, a conversion control unit 373, a timer 374, an information acquisition unit 375, and a target setting unit 376 as functional elements.

  The power monitoring unit 371 monitors the power (reverse power flow power, received power) flowing through the second energization path Pb. For example, the power monitoring unit 371 detects the direction in which power flows in the second energization path Pb, the power amount, the power value, and the like based on the detection signal output from the watt-hour meter M. In addition, the power monitoring unit 371 calculates the power consumption for each time zone of the power load system LS based on these detection results, and stores the power consumption information in association with the date and time (that is, the date and time zone).

  The power monitoring unit 371 also functions as a power generation prediction unit 376. The power generation prediction unit 376 predicts the generated power for each time zone of the solar cell string 1 based on information stored in the storage unit 36 (for example, power generation fluctuation factor information, power demand information, and electricity rate information). .

  The power storage monitoring unit 372 monitors the state of the power storage device 2. For example, the power storage monitoring unit 372 detects the state of the power storage device 2 based on the state notification signal output from the power storage device 2. The state of the power storage device 2 includes a charge capacity, a charge amount (or SOC), a charge / discharge operation state (for example, a charge operation and a power value of charge power, a discharge operation and a power value of discharge power, and a charge / discharge operation state). Stop) etc.

  The conversion control unit 373 controls the DC / DC converter 31, the inverter 32, and the bidirectional DC / DC converter 33. For example, the conversion control unit 373 includes the state of the photovoltaic power generation system 100 (power sale, self-consumption of power, and power values thereof), the state of the power storage device 2, information stored in the storage unit 36, and user input. Based on the above, the power conversion operation of the DC / DC converter 31, the inverter 32, and the bidirectional DC / DC converter 33 is detected and the power conversion operation is controlled. Note that the control of the power conversion operation includes switching of the power conversion direction, adjustment of the power conversion amount, stop of power conversion, and the like.

  The conversion control unit 373 also functions as a storage control unit. The storage control unit controls the power storage device 2 based on the prediction result of the power generation prediction unit (that is, the power monitoring unit 371) and the output suppression information. That is, conversion control unit 373 controls the charge / discharge function of power storage device 2 by controlling DC / DC converter 31, inverter 32, and bidirectional DC / DC converter 33. For example, the conversion control unit 373 discharges the power storage device 2 in a time zone before the output suppression period, or charges the power storage device 2 with power in the output suppression period.

  The timer 374 is a timekeeping unit that measures the current date and time (that is, the current date and time) or the elapsed time from a predetermined time point to the current time point.

  The information acquisition unit 375 acquires various information (calendar information, weather information, output suppression information, power demand information, electricity rate information, etc.) through the controller 4 and the network NT described later. Calendar information can be acquired from a server such as NAOJ, and weather information can be acquired from a server of the Japan Meteorological Agency. Further, the output suppression information and the electricity bill information can be acquired from the server of the power supplier.

  The target setting unit 376 determines a target SOC for each time zone of each day based on the prediction result of the power generation prediction unit (that is, the power monitoring unit 371) and the information acquired by the information acquisition unit 375, and corresponds to the date and time. In addition, the target SOC is set.

  Next, the controller 4 will be described. The controller 4 includes a display unit 41, an input unit 42, a communication unit 43, a communication I / F 44, and a CPU 45. The display unit 41 displays information on the photovoltaic power generation system 100 on a display (not shown). The input unit 42 receives a user input and outputs an input signal corresponding to the user input to the CPU 45. The communication unit 43 is a communication interface that performs wireless communication or wired communication with the PCS 3. For example, the communication unit 43 transmits information related to the user input received by the input unit 42 to the PCS 3. The communication I / F 44 is a communication interface connected to a network NT (for example, the Internet). The CPU 45 controls each component of the controller 4 using control information, a program, and the like stored in a memory (not shown) that holds information non-temporarily.

  Next, the power control method of the photovoltaic power generation system 100 in the first configuration example will be described. FIG. 2 is a flowchart for explaining power control processing in the first configuration example. In the following, the power control process on the day when the disconnection period is commanded will be described. In the following power control process, the operating voltage (operating point) of the solar cell string 1 is normally controlled so that the generated power is maximized.

  First, the information acquisition unit 375 acquires power generation variation factor information and output suppression information and stores them in the storage unit 36 (S101). The power generation prediction unit (that is, the power monitoring unit 371) predicts the generated power for each time zone of the solar cell string 1 based on the power generation variation factor information stored in the storage unit 36 (S102). The target setting unit 376 creates target value information based on the prediction result of the power generation prediction unit, output suppression information, and the like (S103). Then, the timer 374 acquires the current date and time (S104).

  Next, the target setting unit 376 determines whether or not to edit the target value information (S105). That is, it is determined whether or not to update the target SOC schedule of the power storage device 2 (setting of the target SOC for each time zone of each day). When the target value information is not edited (NO in S105), the process proceeds to S109 described later. On the other hand, when editing the target value information (YES in S105), the information acquisition unit 375 newly acquires the power generation variation factor information and the output suppression information and stores them in the storage unit 36 (S106). The power generation prediction unit newly predicts the generated power for each time zone based on the power generation fluctuation factor information stored in the storage unit 36 (S107). The target setting unit 376 edits the target value information (S108). Then, the process proceeds to S109.

  The power storage monitoring unit 372 acquires the current SOC of the power storage device 2 (S109). Then, it is determined whether the photovoltaic power generation system 100 is disconnected from the commercial power system CS based on the current date and output suppression information (S110).

  When it is determined that they are disconnected (YES in S110), the conversion control unit 373 controls the reverse conversion amount of the inverter 32 to a predetermined set value. The set value is set to a value equal to or higher than the predicted value of power consumption, and the setting information is stored in the storage unit 36. Specifically, the conversion control unit 373 determines whether or not the reverse conversion amount of the inverter 32 is larger than a set value (S113). When it is determined that the value is larger than the set value (YES in S113), the conversion control unit 373 reduces the reverse conversion amount of the inverter 32 (S114). Then, the process returns to S113. When it is not determined that the value is larger than the set value (NO in S113), the conversion control unit 373 determines whether the reverse conversion amount of the inverter 32 is smaller than the set value (S115). When it determines with it being smaller than a setting value (it is YES at S115), the conversion control part 373 increases the reverse conversion amount of the inverter 32 (S116). Then, the process returns to S113. If it is not determined that the value is smaller than the set value (NO in S115), the process proceeds to S117.

  The power storage monitoring unit 372 determines whether or not the current SOC is lower than the target SOC based on the target value information and the current date and time (S117). When it is determined that the current SOC is low (YES in S117), conversion control unit 373 operates bidirectional DC / DC converter 33 in charge conversion direction A (S118). Then, the charge conversion of the bidirectional DC / DC converter 33 and the power generation of the solar cell string 1 are controlled (S119). That is, the conversion control unit 373 controls the charge conversion of the bidirectional DC / DC converter 33, and the DC / DC converter 31 controls the generated power of the solar cell string 1. For example, the charge conversion amount of the bidirectional DC / DC converter 33 is increased. When the charge conversion amount is maximized, the generated power is reduced by controlling the operating voltage of the solar cell string 1. Then, the process returns to S104.

  On the other hand, when it is not determined that the current SOC is low (NO in S117), conversion control unit 373 stops charge conversion of bidirectional DC / DC converter 33 in order to stop charging of power storage device 2 (S120). Then, power generation of the solar cell string 1 is controlled (S121). That is, the DC / DC converter 31 reduces the generated power by controlling the operating voltage of the solar cell string 1. Then, the process returns to S104.

  Next, when it is not determined that the photovoltaic power generation system 100 is disconnected from the commercial power system CS (NO in S110), the conversion control unit 373 first causes the DC / DC converter 31 to perform MPPT control on the solar cell string 1. It is determined whether or not (S122). If MPPT control is being performed (YES in S122), the process proceeds to S130 described later. When MPPT control is not performed (NO in S122), the conversion control unit 373 causes the DC / DC converter 31 to perform MPPT control (S123), and the process proceeds to S130.

  The power storage monitoring unit 372 determines whether or not the current SOC is higher than the current target SOC based on the target value information and the current date and time (S130). When it is determined that the current SOC is high (YES in S130), conversion control unit 373 causes bidirectional DC / DC converter 33 to operate in discharge conversion direction B (S132). Then, the conversion control unit 373 controls the discharge conversion of the bidirectional DC / DC converter 33 and the reverse conversion of the inverter 32 in order to reduce the current SOC (S133). Then, the process returns to S104.

  If it is not determined that the current SOC is high (NO in S130), the power storage monitoring unit 372 determines whether the current SOC is lower than the current target SOC based on the target value information and the current date and time (S140). . If it is determined that the current SOC is low (YES in S140), conversion control unit 373 causes bidirectional DC / DC converter 33 to operate in charge conversion direction A (S141). Further, the conversion control unit 373 controls the charge conversion of the bidirectional DC / DC converter 33 and the reverse conversion of the inverter 32 based on the information stored in the storage unit 36 in order to increase the current SOC (S144). Then, the process returns to S104.

  If it is not determined that the current SOC is low (NO in S140), the conversion control unit 373 stops the power conversion of the bidirectional DC / DC converter 33 (S151). Then, the process returns to S104.

  In the power control process described above, when power can be supplied from the power source other than the photovoltaic power generation system 100 to the power load system LS even during the disconnection period, the set value of the reverse conversion amount in S113 to S116 is The power consumption may be set to a value less than the predicted value. For example, if the commercial power system CS is connected via a path different from the energization path P, the set value may be set to 0 [kW]. Alternatively, in such a case, the conversion control unit 373 stops the power conversion of the inverter 32 instead of the processing of S113 to S116, and operates the inverter 32 after the end of the disconnection period (that is, NO in S110). May be.

  Next, a control example of the power storage device 2 in the present embodiment will be described. FIG. 3 is a graph showing an example of charge / discharge control of the power storage device 2 in the first embodiment. Note that, as described above, in the solar power generation system 100 of the present embodiment, the power storage device 2 cannot charge the received power purchased from the commercial power system CS.

  Moreover, in FIG. 3, the sunrise is in the time zone 6:00 to 7:00, and the sunset is in the time zone 18:00 to 19:00. Since there is no solar radiation in the time zone before sunrise 0:00 to 6:00 and the time zone after sunset 19:00 to 24:00, no generated power is generated. The amount of solar radiation usually increases from 6:00 to 7:00 in the daylight hours and reaches its maximum in the hours 12:00 to 13:00, and thereafter from 18:00 to 19:00 in the sunset Decrease. In this case, the generated power is generated in the time zone from 6:00 to 19:00 from sunrise to sunset, and becomes the largest in the peak time zone from 12:00 to 13:00. However, since the power that flows backward from the distributed power source other than the solar power generation system 100 to the commercial power system CS increases before and after the peak time period 12:00 to 13:00, the power in the commercial power system CS Surplus occurs. Therefore, the time zone 11:00:00 to 14:00 including the peak time zone 12:00 to 13:00 is designated as the disconnection period by the power supply company that operates and manages the commercial power system CS. Therefore, in this disconnection period 11: 00 to 14:00, the photovoltaic power generation system 100 is disconnected (that is, the linked operation is canceled) to disconnect the commercial power system CS in order to suppress the output of the reverse power flow. Be drunk.

  The target setting unit 376 secures the target SOC of the power storage device 2 as shown by the thick broken line graph in FIG. 3 in order to secure in advance a free capacity of power to charge the power storage device 2 in the disconnection period 11: 00 to 14:00. Set to. Therefore, the SOC of the power storage device 2 changes as shown by the solid line graph in FIG. That is, in order to lower the SOC by discharging the power storage device 2 before the start time 11:00 of the disconnection period, the target SOC (Sb) in the time period 1:00 to 10:30 is a time period including the disconnection period. It is set sufficiently lower than the target SOC (Sc) of 10:30 to 15:00. At this time, the SOC difference (Sc−Sb) between the two was obtained by removing the predicted power consumption value from the predicted power generation value in the time period 10:30 to 15:00 including the disconnection period 11: 00 to 14:00. It is desirable that the value be equal to or greater than the value corresponding to the electric energy, and it is more desirable that the value be larger than the value. If it carries out like this, the said electric energy can be charged to the electrical storage apparatus 2. FIG. Therefore, it is possible to reduce the suppression of generated power in the disconnection period 11: 00 to 14:00 and to generate power efficiently. Therefore, it is possible to increase the total generated power of the day by effectively using the generated power in the disconnection period 11: 00 to 14:00.

  Specifically, based on FIG. 3, the target SOC is set to the target value Sa (for example, Sa = 60%) in the time zone 0: 0 to 1:00. At this time, since the SOC has reached the target SOC, the power storage device 2 stops the charge / discharge operation.

  In the time zone 1:00 to 10:30, in order to discharge the power storage device 2 in preparation for charging in the disconnection period 11: 00 to 14:00, the target SOC is a target value Sb (for example, Sb) lower than the target value Sa. = 30%). Therefore, the power storage device 2 stops the charge / discharge operation after discharging until the SOC reaches the target value Sb.

  In the time zone 10:30 to 15:00 including the disconnection period 11:00 to 14:00, the target SOC is set to a target value Sc (for example, Sc = 95%) higher than the target value Sb. In the time zone 10:30 to 14:00, the reverse conversion amount of the inverter 32 is significantly reduced in order to stop selling power in preparation for the disconnection of the solar power generation system 100. Therefore, surplus power obtained by removing predetermined power (for example, power consumption) from the generated power is supplied to the power storage device 2, and the power storage device 2 charges this surplus power. On the other hand, after the disconnection period 11: 00 to 14:00, the grid power operation of the solar power generation system 100 and the commercial power system CS becomes possible, and the disconnection of the solar power generation system 100 is canceled and power is sold. It becomes possible. Therefore, in the time zone 14: 00 to 15:00, the amount of reverse conversion of the inverter 32 is significantly increased, the surplus power is almost eliminated, the power storage device 2 cannot be charged, and the SOC is not increased.

  In the time zone 15: 00 to 24:00, the target SOC is set to a target value Sd (for example, Sd = 60%) lower than the target value Sc so as to leave the reserved stored electric power for discharging. Therefore, power storage device 2 stops charging / discharging operation after discharging until SOC reaches target value Sd. In the present embodiment, since the power storage device 2 has a configuration in which the received power cannot be charged, the reserve stored power is set to a larger value than the configuration in which the received power can be charged.

Second Embodiment
Next, a second embodiment will be described. Hereinafter, a configuration different from the first embodiment will be described. Moreover, the same code | symbol is attached | subjected to the structure part similar to 1st Embodiment, and the description may be abbreviate | omitted.

  FIG. 4 is a block diagram illustrating a second configuration example of the solar power generation system 100. The photovoltaic power generation system 100 is a power generation facility used as an industrial distributed power source, and converts AC power received from a commercial power system CS via a current path P into DC power and charges the power storage device 2. Can do.

  In the solar power generation system 100 of the second configuration example, the PCS 3 includes a bidirectional inverter 38 in addition to the same components 31 and 33 to 37 as those in the first configuration example (FIG. 1). The bidirectional inverter 38 is connected to the DC / DC converter 31 and the bidirectional DC / DC converter 33 via the bus line BL.

  The bidirectional inverter 38 is a power conversion unit controlled by the CPU 37 and is provided between the bus line BL and the first energization path Pa. The bidirectional inverter 38 can perform bidirectional power conversion as shown in FIG. 4 by PWM control or PAM control. For example, in addition to reverse conversion (power conversion in the reverse conversion direction b), the bidirectional inverter 38 AC / DC converts AC power input from the first current path Pa into DC power and outputs it to the bus line BL. Can do. In the following description, the bidirectional inverter 38 converting the electric power input from the first energization path Pa and outputting the electric power to the bus line BL is referred to as power conversion in the forward conversion direction a. Furthermore, the power conversion in the forward conversion direction a is referred to as forward conversion, and the power conversion amount of the forward converted power is referred to as the forward conversion amount.

  The bidirectional inverter 38 is controlled by a conversion control unit 373. For example, the conversion control unit 373 determines whether the photovoltaic power generation system 100 is in a state based on the state of the power generation system 100 (power sale, power purchase, self-consumption of power, and the power value thereof), the state of the power storage device 2, and the user input. The power conversion operation of the directional inverter 38 is detected and the power conversion operation is controlled.

  Next, the power control method of the photovoltaic power generation system 100 in the second configuration example will be described. FIG. 5 is a flowchart for explaining the power control process in the second configuration example. In the following, the power control process on the day when the disconnection period is commanded will be described. In the following power control process, the operating voltage (operating point) of the solar cell string 1 is normally controlled so that the generated power is maximized.

  First, the processing of S101 to S110 is the same as the power control processing (see FIG. 2) in the first configuration example. Therefore, these explanations are omitted.

When it is determined that the photovoltaic power generation system 100 is disconnected from the commercial power system CS (YES in S110), the conversion control unit 373 controls the reverse conversion amount of the bidirectional inverter 38 to a predetermined set value. To do. The set value is set to a value equal to or higher than the predicted value of power consumption, and the setting information is stored in the storage unit 36. Specifically, the conversion control unit 373 determines whether or not the bidirectional inverter 38 is operating in the reverse conversion direction b (S211). If it is determined that the camera is operating in the reverse conversion direction b (YES in S211), the process proceeds to S213 described later.
When it is not determined that it is operating in the reverse conversion direction b (NO in S211), the conversion control unit 373 operates the bidirectional inverter 38 in the reverse conversion direction b (S212). And a process progresses to S213 mentioned later.

  The conversion control unit 373 determines whether or not the reverse conversion amount of the bidirectional inverter 38 is larger than the set value (S213). When it is determined that the value is larger than the set value (YES in S213), the conversion control unit 373 reduces the reverse conversion amount of the bidirectional inverter 38 (S214). Then, the process returns to S213. When it is not determined that the value is larger than the set value (NO in S213), the conversion control unit 373 determines whether the reverse conversion amount of the bidirectional inverter 38 is smaller than the set value (S215). When it is determined that the value is smaller than the set value (YES in S215), the conversion control unit 373 increases the reverse conversion amount of the bidirectional inverter 38 (S216). Then, the process returns to S213. If it is not determined that the value is smaller than the set value (NO in S215), S117 to S121 are performed as in the power control process (see FIG. 2) in the first configuration example, and then the process returns to S104.

  Next, when it is not determined that the photovoltaic power generation system 100 is disconnected from the commercial power system CS (NO in S110), first, whether or not the DC / DC converter 31 is MPPT-controlled for the solar cell string 1 is determined. It is determined (S122). When MPPT control is being performed (YES at S122), when MPPT control is not being performed (NO at S122), the DC / DC converter 31 is MPPT controlled (S123), and the process proceeds to S230.

  The power storage monitoring unit 372 determines whether or not the current SOC is higher than the target SOC based on the target value information and the current date and time (S230). When it is determined that the current SOC is high (YES in S230), the conversion control unit 373 operates the bidirectional inverter 38 in the reverse conversion direction b (S231) and causes the bidirectional DC / DC converter 33 to operate in the discharge conversion direction B. (S232). Then, the conversion control unit 373 controls the discharge conversion of the bidirectional DC / DC converter 33 and the reverse conversion of the bidirectional inverter 38 in order to reduce the current SOC (S233). Then, the process returns to S104.

  If it is not determined that the current SOC is high (NO in S230), the power storage monitoring unit 372 determines whether the current SOC is lower than the current target SOC based on the target value information and the current date and time (S240). . When it is determined that the current SOC is low (YES in S240), conversion control unit 373 causes bidirectional DC / DC converter 33 to operate in charge conversion direction A (S241). Further, the conversion control unit 373 determines whether or not to purchase power based on information stored in the storage unit 36 (for example, power rate information) (S242). If it is not determined to purchase power (NO in S242), the process proceeds to S244 described later. If it is determined to purchase power (YES in S242), the conversion control unit 373 operates the bidirectional inverter 38 in the forward conversion direction a (S243). Then, the process proceeds to S244.

  The conversion control unit 373 controls the charge conversion of the bidirectional DC / DC converter 33 and the power conversion of the bidirectional inverter 38 based on the information stored in the storage unit 36 in order to increase the current SOC (S244). Then, the process returns to S104.

  When it is not determined that the current SOC is low (NO in S240), the conversion control unit 373 operates the bidirectional inverter 38 in the reverse conversion direction b (S250), and stops the power conversion of the bidirectional DC / DC converter 33. (S251). Then, the process returns to S104.

  Next, a control example of the power storage device 2 in the present embodiment will be described. FIG. 6 is a graph illustrating an example of charge / discharge control of the power storage device 2 according to the second embodiment. As described above, in the photovoltaic power generation system 100 of the present embodiment, the power storage device 2 can charge the received power purchased from the commercial power system CS. Further, the distribution of generated power and the disconnection period in FIG. 6 are the same as those in the first embodiment (see FIG. 3).

  The target setting unit 376 reserves the target SOC of the power storage device 2 as shown by the thick broken line graph in FIG. 6 in order to secure in advance a free capacity of power to charge the power storage device 2 in the disconnection period 11: 00 to 14:00. Set to. Therefore, the SOC of the power storage device 2 changes as shown by the solid line graph in FIG. That is, since the power storage device 2 is discharged and the SOC is lowered before the start time 11:00 of the disconnection period, the target SOC (Se) in the time period 0:00 to 10:30 is a time period including the disconnection period. It is set sufficiently lower than the target SOC (Sf) of 10:30 to 18:00. At this time, the SOC difference (Sf−Se) between the two is obtained by removing the predicted value of power consumption from the predicted value of generated power in the time period 10:30 to 18:00 including the disconnection period 11: 00 to 14:00. It is desirable that the value be equal to or greater than the value corresponding to the electric energy, and it is more desirable that the value be larger than the value. If it carries out like this, the said electric energy can be charged to the electrical storage apparatus 2. FIG. Therefore, it is possible to reduce the suppression of generated power in the disconnection period 11: 00 to 14:00 and to generate power efficiently. Therefore, it is possible to increase the total generated power of the day by effectively using the generated power in the disconnection period 11: 00 to 14:00.

  Specifically, based on FIG. 6, the target SOC is the target SOC in order to discharge the power storage device 2 in preparation for charging in the disconnection period 11: 00 to 14:00 in the time zone 0:00 to 10:30. The value Se (for example, Se = 30%) is set. Since the target SOC has already reached the target value Se at time 0:00, the power storage device 2 stops the charge / discharge operation.

  In the time zone 10:30 to 18:00 including the disconnection period 11:00 to 14:00, the target SOC is set to a target value Sf (for example, Sf = 95%) higher than the target value Se. In the time zone 10:30 to 14:00, the reverse conversion amount of the inverter 32 is significantly reduced in order to stop selling power in preparation for the disconnection of the solar power generation system 100. Therefore, surplus power obtained by removing predetermined power (for example, power consumption) from the generated power is supplied to the power storage device 2, and the power storage device 2 charges this surplus power. On the other hand, after the disconnection period 11: 00 to 14:00, the grid power operation of the solar power generation system 100 and the commercial power system CS becomes possible, and the disconnection of the solar power generation system 100 is canceled and power is sold. It becomes possible. Therefore, in the time zone 14: 00 to 18:00, the amount of reverse conversion of the inverter 32 is significantly increased, the surplus power is almost eliminated, the power storage device 2 cannot be charged, and the SOC does not increase.

  In the time zone 18: 00 to 24:00, the target SOC is set to a target value Sg (for example, Sd = 30%) lower than the target value Sf in order to discharge with the reserve stored power remaining. Therefore, power storage device 2 stops charging / discharging operation after discharging until SOC reaches target value Sg. In the present embodiment, since the power storage device 2 is configured to charge the received power, the reserve stored power is set to a smaller value than the configuration where the received power cannot be charged.

<Third Embodiment>
Next, a third embodiment will be described. Hereinafter, a configuration different from the first and second embodiments will be described. Moreover, the same code | symbol is attached | subjected to the component similar to 1st and 2nd embodiment, and the description may be abbreviate | omitted.

  In the third embodiment, the solar power generation system 100 is a power generation facility used as a home-use distributed power source, and converts AC power received from the commercial power system CS through the current path P into DC power to store power. The device 2 can be charged. The configuration of the photovoltaic power generation system 100 and the power control method are the same as in the second embodiment (see FIGS. 4 and 5).

  A control example of the power storage device 2 in the present embodiment will be described. FIG. 7 is a graph illustrating an example of charge / discharge control of the power storage device 2 in the third embodiment. Note that the distribution of generated power and the disconnection period in FIG. 7 are the same as those in the first and second embodiments (see FIGS. 3 and 6).

  First, when purchasing power from the commercial power system CS, the power charge differs for each time zone. For example, a nighttime charge (for example, before 7:00 and after 23:00) where power demand is relatively low is cheaper than a daytime charge. Therefore, the power to cover the power consumption of the power load system LS before the disconnection period (for example, from 7:00 to 10:00) is charged in advance at night (for example, from 0:00 to 7:00). Furthermore, in order to secure in advance the power capacity to be charged in the disconnection period from 11:00 to 13:00, the SOC of the power storage device 2 is sufficiently lowered in the time zone before the start time of 11:00 in the disconnection period. Therefore, target setting unit 376 sets the target SOC of power storage device 2 as shown by the thick broken line graph in FIG. Therefore, the SOC of the power storage device 2 changes as shown by the solid line graph in FIG.

  That is, the target SOC (Sh) in the time zone 0:00 to 7:00 is set higher than the target SOC (Si) in the time zone 7:00 to 10:30. Further, the target SOC (Si) in the time zone 7:00 to 10:30 is set sufficiently lower than the target SOC (Sg) in the time zone 10: 0 to 16:00 including the disconnection period. At this time, the SOC difference (Sj−Si) between the two may be equal to or greater than the value corresponding to the amount of power obtained by subtracting the amount of consumed power from the amount of generated power in the disconnection period 11: 00 to 14:00. desirable. In this way, the power storage device 2 can be charged with the power. Therefore, it is possible to generate power efficiently without missing the opportunity for the solar cell string 1 to generate power in the disconnection period 11: 00 to 14:00. Therefore, it is possible to increase the total generated power of the day by effectively using the generated power in the disconnection period 11: 00 to 14:00.

  Specifically, based on FIG. 7, in the time zone 0:00 to 7:00, the power storage device 2 is supplied with power for covering power consumption in the time zone 7:00 to 10:30 before the disconnection period. In order to charge, target SOC is set to target value Sh (for example, Sh = 50%). Therefore, power storage device 2 stops charging / discharging operation after discharging until SOC reaches target value Sh.

  When the time is 7:00, the electricity charge for power purchase will be higher than at night. Therefore, in the time zone 7:00 to 10:30, the electricity charge is kept low, and the power storage device 2 is discharged in preparation for charging in the disconnection period 11:00 to 14:00. Si (for example, Si = 5%) is set. Therefore, power storage device 2 stops charging / discharging operation after discharging until SOC reaches target value Si.

  In the time zone 10:30 to 16:00 including the disconnection period 11: 00 to 14:00, the target SOC is set to a target value Sj (for example, Sj = 95%) higher than the target value Si. In the time zone 10:30 to 14:00, the reverse conversion amount of the inverter 32 is significantly reduced in order to stop selling power in preparation for the disconnection of the solar power generation system 100. Therefore, surplus power obtained by removing predetermined power (for example, power consumption) from the generated power is supplied to the power storage device 2, and the power storage device 2 charges this surplus power. On the other hand, after the disconnection period 11: 00 to 14:00, the grid power operation of the solar power generation system 100 and the commercial power system CS becomes possible, and the disconnection of the solar power generation system 100 is canceled and power is sold. It becomes possible. Therefore, in the time zone 14: 00 to 16:00, the amount of reverse conversion of the inverter 32 is significantly increased, the surplus power is almost eliminated, the power storage device 2 cannot be charged, and the SOC does not increase.

  In the time zone 16:00 to 24:00, the target SOC is set to a target value Sk (for example, Sd = 5%) that is lower than the target value Sj so as to leave the reserved stored electric power for discharging. Therefore, the power storage device 2 stops charging / discharging operation after discharging until the SOC reaches the target value Sk. In the present embodiment, the power storage device 2 is configured to be able to charge received power, and since it is for home use, there is almost no need to leave spare stored power in preparation for a night power outage or the like. Therefore, the reserve stored power is set to a value smaller than that of an industrial configuration in which the received power cannot be charged.

  The embodiment of the present invention has been described above. The above-described embodiment is an exemplification, and various modifications can be made to the combination of each component and each process, and it will be understood by those skilled in the art that it is within the scope of the present invention.

  For example, in the above-described first to third embodiments, the power storage device 2 is illustrated as an energy storage device, but the present invention is not limited to this illustration. The energy storage device may be a device or equipment that can convert the electric power supplied from the PCS 3 into another predetermined form and store it (for example, thermal storage, mechanical storage, or chemical storage). For example, the energy storage device may be a hot water tank, a flywheel battery, a hydrogen generation storage device, or the like. In the hot water tank, hot water can be supplied using the converted heat. In addition, in the flywheel battery, electric energy can be converted into kinetic energy and stored, and electric power can be released by power generation using kinetic energy. In the hydrogen generation and storage device, hydrogen is generated and stored, for example, by electrolysis of water, and the stored hydrogen is used for other energy, or the stored hydrogen is used to generate electricity using a fuel cell, etc. I can do it.

  In the first to third embodiments described above, the conversion control unit 373 controls the power storage device 2 based on the target value information, the power generation variation factor information, and the output suppression information when functioning as the storage control unit. However, the present invention is not limited to this example. Conversion control unit 373 may control power storage device 2 based on at least one of power demand information and electricity rate information in addition to target value information, power generation fluctuation factor information, and output suppression information.

  Moreover, although the electric power control method (refer FIG.2 and FIG.5) of the above-mentioned 1st-3rd embodiment is performed based on the target SOC set to target value information, this invention is not limited to this illustration. . The power control may be performed based on the target SOC and charge / discharge rate set in the target value information. That is, power control may be performed so that the current SOC reaches the target SOC at the charge rate or discharge rate set in the target value information. By so doing, rapid charging or discharging can be avoided, so that deterioration or breakage of the power storage device 2 can be suppressed or prevented.

  Moreover, in the above-described first to third embodiments, the charge / discharge control example (see FIGS. 3, 6, and 7) of the power storage device 2 will be described with reference to the disconnection period as the output suppression period of the output suppression information. However, the present invention is not limited to this example. Even in a period other than the disconnection period in which the power flowing backward to the commercial power system CS is suppressed, the power that can be charged to the power storage device 2 in the output suppression period is increased by performing the same charge / discharge control. Can do. Therefore, the generated power during the output suppression period can be used effectively, and the overall generated power of the day can be increased.

  Moreover, in the above-mentioned 1st-3rd embodiment, although the solar cell string 1 is used as a power generator, a power generator is not limited to these illustrations. A power generation apparatus that performs power generation using renewable energy other than sunlight (natural energy generation such as wind power, hydropower, geothermal, biomass, solar heat, waste power generation, etc.) may be used.

  In the first to third embodiments described above, the commercial power system CS is connected to the power supply path P, but an AC power source other than the commercial power system CS may be connected to the power supply path P1. For example, another power generation facility may be connected to the energization path P1.

  In the first to third embodiments described above, at least some or all of the functional components 371 to 376 of the CPU 37 are realized by physical components (for example, electric circuits, elements, devices, and the like). May be.

  In the first to third embodiments described above, the present invention has been described by exemplifying the PCS 3 of the solar power generation system 100, but the present invention is not limited to these examples. The present invention can be widely applied to devices that control the charge / discharge function of the power storage device 2.

<Summary>
According to embodiment described above, the control apparatus 3 is the control apparatus 3 which controls the energy storage apparatus 2 which can store the electric power of the power generation equipment 100 connected to the power system CS in a predetermined form, The power generation prediction unit 371 that predicts the generated power for each time zone of the power generation device 1 included in the power generation facility 100 based on the power generation fluctuation factor information, and the energy storage device 2 based on the prediction result and the output suppression information in the power generation prediction unit A storage control unit 373 for controlling, the power generation variation factor information includes information indicating a factor that the generated power varies every day and every time zone, and the output suppression information is power output from the power generation facility 100 to the power system CS. The storage control unit 371 releases the stored energy in a predetermined form stored in the energy storage device 2 before the output suppression period, and suppresses the output suppression. It is configured to be stored in a predetermined form the generated power to the energy storage device 2 in the period.

  Further, according to the embodiment described above, the recording medium 36 readable by the computer 37 stores the control program in a non-temporary manner. This control program is a control program for causing the computer 37 to execute a process for controlling the energy storage device 2 capable of storing the power of the power generation facility 100 operated in linkage with the power system CS in a predetermined form. Is a step of predicting generated power for each time zone based on power generation fluctuation factor information including information indicating a factor that causes the generated power of the power generation apparatus 1 included in the power generation facility 100 to vary for each time zone, and a step of predicting Controlling the energy storage device 2 based on the prediction result and output suppression information indicating an output suppression period (for example, a disconnection period) in which power output from the power generation facility 100 to the power system CS is suppressed. And the step of controlling the energy storage device 2 is a predetermined storage energy stored in the energy storage device 2 in a time zone before the output suppression period. It is a step of releasing Energy, the steps to be stored in a predetermined form the generated power to the energy storage device 2 at the output suppression period, configured to include.

  According to these configurations, the energy storage device 2 releases the stored energy in a predetermined form before the output suppression period (for example, the disconnection period) to increase the storage capacity, and then the power storage device 1 in the output suppression period. The generated power can be stored in a predetermined form. Therefore, it is possible to store a larger amount of generated electric power than when the stored energy is not released in advance. Therefore, for example, since it is not necessary to suppress or stop power generation in the output suppression period, the power generation apparatus 1 can be operated efficiently. Therefore, the overall generated power of the day can be increased by effectively using the generated power during the output suppression period.

  The control device 3 further includes a target setting unit 376 that sets a target value (target SOC) of the stored energy for each time zone based on the prediction result of the power generation prediction unit 371 and the output suppression information, and the storage control unit 376 Based on the target value in each time zone, the stored energy of the energy storage device 2 is controlled, and the target setting unit 376 has a first target value Sc in the first time zone including an output suppression period (for example, a disconnection period), The configuration may be such that the second target values Sb, Se, Si in the second time zone immediately before the first time zone are set lower than Sf, Sj.

  If it carries out like this, the storage energy of the energy storage apparatus 2 can be controlled based on the target value (target SOC) of the storage energy set for every time slot | zone. Further, by lowering the target values Sb, Se, Si in the second time zone immediately before the first time zone including the output suppression period (for example, the disconnection period), the stored energy is released in advance, and the energy storage device 2 Storage capacity can be kept free. Therefore, in the first time zone including the output suppression period, more generated power can be stored in the energy storage device 2 than when the stored energy is not released in advance.

  Further, the control device 3 may be configured such that the output suppression period includes a disconnection period in which the power generation facility 100 is disconnected from the power system CS.

  In this way, the energy storage device 2 stores the generated power of the power generation device 1 in the disconnection period after causing the energy storage device 2 to release the stored energy before the disconnection period in which the power that can be stored in a predetermined form becomes large. can do. Therefore, the power generator 1 can be operated more efficiently.

  In addition, the control device 3 controls the energy storage device 2 based on at least one of the power demand information and the electricity rate information, and the power demand information is a power load connected to the power generation facility 100. Even if it is the structure which shows the prediction value of the power consumption for every time zone which LS requires, and the electricity bill information shows the charge for every time zone of the electric power which the power grid | system CS supplies to at least one of the power generation equipment 100 and the electric power load LS. Good.

  In this way, the energy storage device 2 can be controlled using at least one of the power demand information and the electricity rate information. When the control is further performed using the power demand information, the stored energy and the power discharged from the energy storage device 2 can be controlled in consideration of the predicted value of the power consumption for each time zone required by the power load LS connected to the power generation facility 100. . Therefore, the power generator 1 can be operated more efficiently, and power purchase (received power) and power sale (reverse power flow power) for the power system CS can be controlled more precisely. Moreover, when controlling further using electricity rate information, it is possible to control the stored energy and the power released from the energy storage device 2 in consideration of the rate for each time zone of power (received power) purchased from the power system CS. Therefore, it becomes easy to adjust the charge of power to be purchased per day. For example, the daily charge can be kept low by purchasing power during a time when the charge is low.

  Moreover, the control apparatus 3 is the solar power generation apparatus 1 as the power generation apparatus 1, and the power generation variation factor information indicates the calendar information and the weather forecast in the area including the place where the power generation apparatus 1 is installed for each time zone. And a configuration including weather information.

  If it carries out like this, the solar radiation amount and weather for every time slot | zone of a day are estimated, and the solar power generation device 1 can be operated efficiently. Therefore, the power generation efficiency of the solar power generation device 1 can be improved, and the overall generated power of the day can be increased.

  Further, the control device 3 may be configured such that the energy storage device 2 can store the power of the power generation facility 100 by converting it into a form other than the power.

  If it carries out like this, electric power can be converted into another energy form (for example, thermal energy, dynamic energy, chemical energy) etc., and can be stored in energy storage device 2.

  Alternatively, the control device 3 is a control device 3 that controls the energy storage device 2 that can store the power of the power generation facility 100 that is interconnected with the power system CS in a predetermined form, and the generated power fluctuates for each time zone. A storage unit 36 for storing power generation variation factor information including information indicating the factor to perform, a power generation prediction unit 371 for predicting the generated power for each time zone of the power generation device 1 of the power generation facility 100 based on the power generation variation factor information, A storage control unit 373 that controls the energy storage device 2 based on the prediction result of the power generation prediction unit 371, and the storage unit 36 is an output that suppresses reverse power flow output from the power generation facility 100 to the power system CS. When the output suppression information indicating whether or not there is a suppression period (for example, a disconnection period) is further stored, and the output suppression information indicates that there is an output suppression period, the storage control unit 373 performs the operation before the output suppression period. The stored energy in a predetermined form stored in the energy storage device 2 is released, the reverse flow power is suppressed during the output suppression period, and the storage control unit 373 stores the generated power in the energy storage device 2 in the predetermined form, thereby suppressing the output. When the information indicates that there is no output suppression period, the reverse flow power is not suppressed.

  In this way, if there is an output suppression period, after the stored energy of a predetermined form is released before the output suppression period (for example, the disconnection period), the power generation device 1 of the power generation device 1 is output in the output suppression period in which the reverse power flow is suppressed. The generated power can be stored in a predetermined form. Therefore, it is possible to store a larger amount of generated electric power than when the stored energy is not released in advance. Therefore, for example, since it is not necessary to suppress or stop power generation in the output suppression period, the power generation apparatus 1 can be operated efficiently. Therefore, the overall generated power of the day can be increased by effectively using the generated power during the output suppression period.

100 Photovoltaic power generation system 1 Solar cell string 2 Power storage device 3 Power conditioner (PCS)
31 DC / DC converter 32 Inverter 33 Bidirectional DC / DC converter 34 Smoothing capacitor 35 Communication unit 36 Storage unit 37 CPU
38 Bidirectional Inverter 371 Power Monitoring Unit 372 Power Storage Monitoring Unit 373 Conversion Control Unit 374 Timer 377 Information Acquisition Unit 376 Target Setting Unit 4 Controller 41 Display Unit 42 Input Unit 43 Communication Unit 44 Communication I / F
45 CPU
BL Bus line P Current path M Energy meter CS Commercial power system LS Power load system NT network

Control apparatus according to one aspect of the present invention in order to achieve the above object, a power generation facility to be operated power system and the communication system and a control device for controlling the savings warehouse capable of energy storage devices, from power generation equipment Based on output suppression information indicating an output suppression period in which power output to the power system is suppressed, the energy storage device is controlled so that the generated power can be stored in the energy storage device in the output suppression period.
In order to achieve the above object, a control device according to an aspect of the present invention is a control device that controls an energy storage device capable of storing power of a power generation facility that is interconnected with an electric power system. Predicting the generated power for each time zone of the power generation device of the power generation equipment based on the information indicating the factors that fluctuate from day to day and every time zone, and the power output from the power generation equipment to the power system is suppressed Based on the output suppression information indicating the output suppression period, the energy storage device is controlled so that the generated power can be stored in the energy storage device in the output suppression period.

In order to achieve the above object, a system according to an aspect of the present invention includes a control device that controls an energy storage device that can store power of a power generation facility that is connected to an electric power system, and an energy storage device. The control device can store the generated power in the energy storage device during the output suppression period based on the output suppression information indicating the output suppression period during which the power output from the power generation facility to the power system is suppressed. The system is configured to control the energy storage device.
Furthermore, in order to achieve the above object, a control method according to an aspect of the present invention is a control method for a control device that controls an energy storage device that can store power of a power generation facility that is interconnected with a power system. A control method for controlling the energy storage device so that the generated power can be stored in the energy storage device in the output suppression period based on output suppression information indicating an output suppression period in which power output from the power generation facility to the power system is suppressed; To do.
In order to achieve the above object, a control program according to an aspect of the present invention executes a process for controlling an energy storage device capable of storing in a predetermined form the power of a power generation facility that is interconnected with a power system. The control program is for predicting the generated power for each time zone based on the power generation variation factor information including information indicating the factor that causes the power generated by the power generation equipment of the power generation equipment to vary for each time zone. And a step of controlling the energy storage device based on a prediction result in the predicting step and output suppression information indicating an output suppression period in which power output from the power generation facility to the power system is suppressed. And the step of controlling the energy storage device releases a predetermined form of stored energy stored in the energy storage device in a time zone before the output suppression period. It is a step of the steps to be stored in a predetermined form the generated power to the energy storage device at an output suppression period, configured to include.

Claims (5)

A control device that controls an energy storage device capable of storing the power of a power generation facility that is interconnected with a power system in a predetermined form,
A power generation prediction unit that predicts the generated power for each time zone of the power generation device of the power generation facility based on power generation variation factor information;
A storage control unit that controls the energy storage device based on a prediction result and output suppression information in the power generation prediction unit,
The power generation fluctuation factor information includes information indicating a factor that the generated power fluctuates every day and every time zone,
The output suppression information indicates an output suppression period during which power output from the power generation facility to the power system is suppressed,
The storage control unit releases the stored energy in the predetermined form stored in the energy storage device before the output suppression period, and stores the generated power in the predetermined form in the energy storage apparatus in the output suppression period. Control device. A target setting unit that sets a target value of the stored energy for each time zone based on a prediction result of the power generation prediction unit and the output suppression information;
The storage control unit controls the stored energy of the energy storage device based on the target value in each time zone,
The target setting unit sets the second target value in the second time zone immediately before the first time zone to be lower than the first target value in the first time zone including the output suppression period. Control device. The storage control unit controls the energy storage device based on at least one of power demand information and electricity rate information,
The power demand information indicates a predicted value of power consumption for each time zone that requires a power load connected to the power generation facility,
3. The control device according to claim 1, wherein the electricity rate information indicates a rate for each time zone of power that the power system supplies to at least one of the power generation facility and the power load. The power generator is a solar power generator,
The power generation variation factor information includes calendar information and weather information indicating a weather forecast in an area including a place where the power generation device is installed for each time zone. Control device. A control device that controls an energy storage device capable of storing the power of a power generation facility that is interconnected with a power system in a predetermined form,
A storage unit that stores power generation variation factor information including information indicating a factor that causes the generated power to vary from time to time;
A power generation prediction unit that predicts generated power for each time zone of the power generation device of the power generation facility based on the power generation variation factor information;
A storage control unit that controls the energy storage device based on a prediction result of the power generation prediction unit,
The storage unit further stores output suppression information indicating the presence or absence of an output suppression period in which reverse power flow output from the power generation facility to the power system is suppressed,
When the output suppression information indicates that the output suppression period is present, the storage control unit releases the stored energy of the predetermined form stored in the energy storage device before the output suppression period, and in the output suppression period Reverse flow power is suppressed and the storage control unit stores the generated power in the energy storage device in the predetermined form,
The control device in which the reverse flow power is not suppressed when the output suppression information indicates that there is no output suppression period.

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