JP6166599B2 - Power storage system and its operation method - Google Patents

Description

  The present invention relates to a power storage system and an operation method thereof for reducing contract power charges and power consumption charges by performing peak cut and peak shift.

  As an operation method of the power storage system, Patent Document 1 discloses an idea of performing peak cut by charging / discharging a battery only in summer, on the assumption that a peak of load power consumption appears in a specific period in summer. . However, this is intended to reduce the operation cost by completely stopping the operation of the system in a period other than the summer, and the system cannot be effectively used during the period when the peak cut is not required.

  Patent Documents 2 and 3 show systems that charge night electricity with a low electricity bill and discharge it in the daytime when a peak appears to realize peak cut. In Patent Document 2, while setting the charging time in the nighttime time zone, by setting the discharging time in the daytime time period, the peak power is cut during the daytime to reduce the contract power charge, and the nighttime power is reduced. Electricity charges are being reduced through the use of peak shifts. Further, in Patent Document 3, when the amount of power used exceeds the set peak value, discharge is suppressed and the peak is suppressed, and the power consumed at night is stored, thereby reducing the contract power charge and the power charge used. ing.

  However, these methods are based on the premise that the peak power consumption occurs only during the daytime when electricity costs are high. In addition, it is assumed that the battery that stores electricity has a sufficient capacity, and does not take into consideration that the capacity of the battery disappears during discharge or that the capacity of the battery changes due to deterioration or temperature.

  A method for performing peak shift and peak cut by performing charge or discharge in a preset time zone and discharging when the power consumption exceeds the peak value during this preset schedule operation. 4. However, in this method, a desired schedule operation cannot be performed unless the patterns of the power consumption are collected over a certain period and schedule data that is a necessary operation plan is created and set from the analysis. In addition, when an unexpected peak occurs, discharging is performed, but it is assumed that the power stored in the battery is not insufficient, the capacity of the battery is lost, or the capacity of the battery changes with deterioration or temperature, I can not cope with such.

JP 2003-189470 A JP 2002-271994 A JP-A-3-226233 Japanese Patent No. 4607533

  In a target facility such as a retail store that operates 24 hours a day, there may be a peak in power consumption not only in the daytime in summer, but also in the evening or at night. For this reason, there is a problem that an effective peak cut cannot be performed in a system in which charging is performed during a night charge period and the stored power is discharged in the daytime.

  In recent years, power storage systems using lithium ion batteries as secondary batteries have begun to spread. Lithium-ion batteries are still expensive compared to lead-acid batteries and the like, and in many cases only batteries with the minimum capacity can be installed. In addition, the amount of power that can be charged / discharged per unit time varies greatly depending on the temperature, and the amount of power decreases due to deterioration due to repeated use, which makes it difficult to grasp the amount of power that can actually be charged / discharged.

  Furthermore, in a target facility that has many stores nationwide, the power usage pattern varies from store to store depending on weather conditions, surrounding housing and office environment, cleaning time zone, and the like. Therefore, in order to perform peak cut or peak shift under schedule operation, the schedule data described above must be created for each store and set in the system, resulting in a great amount of work time and cost.

  Therefore, in view of the above problems, the present invention can achieve a desired peak shift and peak cut regardless of the period in which the peak of power usage appears, and can effectively reduce the contract power charge and the power consumption charge. It aims at providing an electric power storage system and its operation method.

The operation method of the power storage system according to the present invention includes a peak cut control for discharging the secondary battery to reduce the power consumption below the peak value so that the power consumption of the load does not exceed the set peak value. , charging the secondary battery to the electric power consumption is low time zone, and discharging the secondary battery to the electric power consumption is high hours, and peak shift control to equalize the amount of electric power used, the a production method of a power storage system that performs a peak shaving priority mode for giving priority to the peak cut control, one of the peak shift priority mode for giving priority to the peak shift control, and set daily, the In the peak shift priority mode, a control table for performing daily peak shift control that can set a charge amount and a discharge amount at regular time intervals is provided. Based on the charge amount or discharge amount registered in the control table, the secondary battery is charged or discharged, and in the control table used in the peak shift priority mode, the setting prohibition time zone in which the charge amount or discharge amount cannot be set And correcting the error of the remaining battery level by charging the secondary battery aiming at full charge in the setting prohibition time zone .

The power storage system according to the present invention includes a secondary battery that is charged by receiving power supplied from the power system and supplies the discharged power to the load, and a control unit that controls charging and discharging of the secondary battery. A peak cut control for discharging the secondary battery to reduce the power consumption to the peak value or less so that the power consumption of the load does not exceed a set peak value, and a time when the power consumption is low. charging the secondary battery in a band, and discharging the secondary battery to the electric power consumption is high time zones, construction and to the peak shift control to equalize the amount of electric power used, the performed by the control means One of a peak cut priority mode in which the peak cut control is given priority and a peak shift priority mode in which the peak shift control is given priority are set every day. Comprising setting means for, in the peak shift priority mode, a control table for performing peak shift control of the day which can set the charging amount and discharging amount of each fixed time, is registered in the control table in the peak shift control Based on the charged amount or discharged amount, the secondary battery is charged or discharged, and the control table used in the peak shift priority mode includes a setting prohibition time zone in which the charged amount or discharged amount cannot be set, In the setting prohibition time zone, the secondary battery is charged so as to be fully charged, thereby correcting an error in the remaining battery level .

According to the first and sixth aspects of the present invention, the peak cut is required only in a limited period such as summer, so the peak cut priority mode is set in the period when the peak of the load power consumption appears. Setting to ensure the reduction of contracted electricity charges, while setting peak shift priority mode during periods when no peak appears, to ensure the level of power usage that maximizes the use of nighttime power Realize a reduction in electricity consumption. As a result, for example, a store where the peak of power consumption occurs during the night charge period, no matter what period the peak of power usage appears, realize the desired peak shift and peak cut, It is possible to effectively reduce the contract power charge and the power consumption charge.

According to the second and seventh aspects of the invention, in the peak cut priority mode, when the power consumption exceeds the peak value, the secondary battery is discharged by performing load following control, and the power consumption exceeds the peak value. Charge the rechargeable battery with the aim of full charge between the peaks. Since this charging is performed day and night, for example, even during the daytime, it is possible to efficiently charge the secondary battery until the secondary battery is fully charged by using the interval between peaks.

According to the third and eighth aspects of the invention, in the peak cut priority mode, charging is performed with the upper limit value of the battery voltage at the time of full charge that is not easily affected by deterioration or temperature, aiming at the upper limit voltage of the secondary battery between the peaks. To do. Thereby, it is possible to realize a peak cut that makes the best use of the usable battery capacity regardless of the battery capacity decrease due to the deterioration of the secondary battery or the temperature drop.

According to the inventions of claims 4 and 9 , in the peak shift priority mode, the schedule operation for charging and discharging the secondary battery is performed according to the charge / discharge amount set by default for each time, and the schedule operation is being executed. For example, when the amount of power used by the load exceeds a peak value, the set charge / discharge amount is automatically adjusted. As a result, even in the peak shift priority mode, the power consumption can be prevented from exceeding the peak value, and the power consumption pattern can be collected and analyzed by automatically adjusting the charge / discharge amount. Can be eliminated, and the setting of the charge / discharge amount can be greatly simplified. In other words, schedule operation is performed using operation plan data of typical specific stores, etc., and data collection and analysis work for each store is eliminated by a learning function that automatically corrects this operation plan data when it exceeds the peak can do.

According to the present invention, in the peak shift priority mode, peak shift control for charging or discharging the secondary battery can be performed in units of one day based on the charge amount or the discharge amount at regular intervals registered in the control table. It becomes possible. In addition, the contract power is, for example, the maximum value of the average power for 30 minutes. By matching this fixed time with 30 minutes, which is the calculation standard for the contract power, the peak cut control for reducing the contract power is accurately performed. Can be done.

According to the present invention , the secondary battery can be charged aiming at full charge during the setting prohibition time period registered in the control table, and the secondary battery is fully charged by correcting an error in the remaining battery level. By discharging from this state, the secondary battery can be used effectively without waste.

According to the fifth and tenth aspects of the present invention , one specific control table is selected from a plurality of control tables registered for the same day based on information acquired from the outside, and the control table is selected based on the selected control table. By charging or discharging the secondary battery, an appropriate control table is selected according to weather conditions such as weather and temperature, sudden events such as local events, etc., and peak shift control is performed based on this control table. By performing this, an effective peak cut can be performed.

According to the present invention, when the voltage of the secondary battery reaches a voltage value that is larger of the battery voltage value corresponding to the keep power amount or the discharge lower limit voltage value, the discharge of the secondary battery by peak cut control or peak shift control is performed. By preventing this, it is possible to reliably maintain a certain amount of electric power provided in the event of a power failure, and at the same time, to suppress deterioration of the battery due to falling below the discharge lower limit voltage value.

It is a block circuit diagram of the electric power storage system which shows one Example of this invention. FIG. 3 is a block circuit diagram showing a more detailed configuration of the bidirectional inverter. It is a block diagram which shows the function structure of a controller same as the above. It is explanatory drawing which shows the structure of a control table same as the above. Same as above, (A) is a diagram of a load curve showing an example of the relationship between the power consumption of the load and the time, and (B) is a graph showing an example of the relationship between the battery voltage and the time. It is explanatory drawing which shows the structure of a priority mode setting table same as the above. Same as the above, (A) is a diagram of a load curve showing another example of the relationship between the power consumption of the load and the time, (B) is a load curve of (A), charging and discharging in the peak cut priority mode It is explanatory drawing which shows a state, (C) is the graph which showed another example of the relationship between a battery voltage and time. It is a flowchart which shows the process sequence of the control means in a grid connection mode same as the above. It is a flowchart which shows the processing procedure of peak cut priority control same as the above. It is a flowchart which shows the processing procedure of peak shift priority control same as the above. Same as above, before and after applying the learning function, (A) is a diagram of a load curve showing the relationship between the power consumption of the load and time, and (B) is a graph showing an example of the relationship between battery capacity and time It is. It is a flowchart which shows the process sequence of a learning function same as the above.

  Hereinafter, a preferred embodiment of the power storage system and its operation method according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 schematically shows the overall configuration of the power storage system 1. In the figure, 2 is a power system, and 3 is a target facility receiving power from the power system 2. The target facilities 3 herein include, for example, 24-hour retail stores, small and medium-sized buildings and condominiums, small factories, gas stations, public facilities such as schools, and the like. The electronic device 5 and the power storage system 1 that are loads are connected in parallel. Further, a current transformer 7 serving as a current detector is connected to a power supply path 6 that supplies AC power from the power receiving point 4 to the electronic device 5. The electronic device 5 may be a general load, such as a lighting equipment, an air conditioning equipment, a refrigerator, an electric kettle, a POS terminal, a broadcasting equipment, an automatic opening / closing door, an elevator inverter, a water pump, a motor for driving a car lifter, and the like. .

  The power storage system 1 operated in connection with the power system 2 includes a battery pack 8 and a bidirectional inverter 9 as main components. The battery pack 8 includes N battery modules 11A to 11N connected in series, slave BMUs (Battery Management Units) 12A to 12N arranged in each of the battery modules 11A to 11N, and each slave BMU 12A. It is comprised with 1 master BMU13 which manages -12N centrally. Battery modules 11A to 11N each including a plurality of battery cells connected in series constitute a lithium ion battery 11 as a secondary battery. The battery pack 8 includes, for example, 14 battery modules 11A to 11N, and each of the battery modules 11A to 11N includes, for example, 8 battery cells. In this case, the battery pack 8 is a 112 series assembled battery. The voltage and temperature information from each of the battery modules 11A to 11N is taken into the corresponding slave BMUs 12A to 12N, respectively, and is sent to the common master BMU 13 via communication means such as CAN (Controller Area Network) communication, for example. . The master BMU 13 is configured to determine whether each of the battery modules 11A to 11N is normal or abnormal based on voltage and temperature information received from each of the slave BMUs 12A to 12N, and to send the information to the controller 17 described later. It has become. Note that the voltage and temperature information from the battery modules 11A to 11N is measured for each built-in battery cell.

  The bidirectional inverter 9 includes a DC / AC inverter 16 capable of bidirectional power conversion, which includes one or more semiconductor switching elements (not shown) as an inverter, and a controller 17 that controls the DC / AC inverter 16. Consists of. The DC / AC inverter 16 is connected between the power supply path 6 and the lithium ion battery 11, receives a charge control signal from the controller 17, converts AC power from the power supply path 6 into DC power, and controls it. In response to the discharge control signal from the controller 17, the DC power from the lithium ion battery 11 is converted into AC power. In addition to the above-described functions, the controller 17 also includes information on the current from the grid power 2 to the load detected by the current transformer 7 and the AC side of the DC / AC inverter 16 measured by the bidirectional inverter 9. It has a function of taking in information on current and voltage, generating a charge control signal and a discharge control signal for the DC / AC inverter 16, and performing control such as peak cut and peak shift described later. A specific configuration of the controller 17 will be described later.

  FIG. 2 shows the internal configuration of the bidirectional inverter 9 in more detail. In the figure, a bidirectional inverter 9 includes switches 21 and 22, an inrush current prevention circuit 23, noise filters 24 and 25, a control power supply 26, in addition to the DC / AC inverter 16 and the controller 17 described above. It has. Each of the switches 21 and 22 is an opening / closing means that opens and closes in response to a relay control signal from the controller 17. The switch 21 is inserted and connected to a DC line between the lithium ion battery 11 and the DC / AC inverter 16. A switch 22 is inserted and connected to an AC line between the DC / AC inverter 16 and the power supply path 6. The inrush current prevention circuit 23 and the noise filter 24 are inserted and connected to a DC line between the switch 21 and the DC / AC inverter 16, and are connected to the AC line between the DC / AC inverter 16 and the switch 22. Another noise filter 25 is inserted and connected. The control power supply 26 receives direct current power from the lithium ion battery 11 or alternating current power from the power system 2 and supplies an appropriate operating voltage to the controller 17 not only when the power system 2 is normal but also when a power failure occurs. It is.

  In the above configuration, when a charge control signal or a discharge control signal is given from the controller 17 to the DC / AC inverter 16 with both the switches 21 and 22 closed, the lithium ion battery 11 and the power system 2 or the electronic device 5 are provided. Power can be exchanged with At this time, the noise filters 24 and 25 suppress the noise components generated in the DC line and the AC line, respectively, and the inrush current prevention circuit 23 suppresses a steep current change generated in the DC line. The controller 17 opens the switch 21 to safely disconnect the lithium ion battery 11 from the bidirectional inverter 9 when the master BMU 13 determines that any of the battery modules 11A to 11N is abnormal, for example. When the relay control signal is sent, and when it is determined by the signal from the current transformer 7 that the reverse flow flows to the power system 2, the relay control signal that opens the switch 22 is sent to prevent the reverse flow. To do.

  The control controller 17 and the master BMU 13 are connected by an external communication unit 27 capable of bidirectional communication. The external communication means 27 is, for example, CAN communication, and the controller 17 receives information on the battery cell voltage and temperature from the master BMU 13, and conversely, a command to stop processing on the master BMU 13 when an abnormality is detected. Send.

  FIG. 3 particularly shows the functional configuration of the controller 17. In the figure, the controller 17 is composed of a control means 31 such as a CPU and an input / output interface, and a writable storage means 32 such as a flash memory and a hard disk drive. While acquiring current information and current and voltage information on the AC side of the DC / AC inverter 16, it outputs a charge control signal and a discharge control signal to the DC / AC inverter 16, and displays a display control signal on the display 33. Has a function to output. Further, the control unit 31 is configured to read a program stored in the storage unit 32 and to execute the peak shift control unit 34 and the peak cut control unit 35 serving as a power control function of the power storage system 1 according to the program. The storage means 32 is provided with a storage area for storing a control table 37, a voltage / power setting table 38, and a priority mode setting table 39, in addition to such a storage area for programs.

  The peak shift control means 34 stores the lithium ion battery 11 at night power (18:00 to 6:00) where the power consumption of the load is low and the electricity cost is low, and this is used as the power consumption of the load is high. The DC / AC inverter 16 performs a peak shift control that discharges the electronic device 5 during a high daytime period, leveles the amount of power used, and saves the electricity cost for the difference. Here, the peak cut effect can also be obtained by discharging the lithium ion battery 11 during the daytime when the power consumption of the load reaches its peak.

  In the peak shift control by the peak shift control means 34, a schedule operation based on a control table 37 set in advance in the storage means 32 is performed. Specifically, the peak shift control unit 34 is provided in the control unit 31 so as to charge or discharge the lithium ion battery 11 with a specified amount of power in a specified time zone based on information in the control table 37. The charge / discharge function is instructed and a charge control signal or a discharge control signal is sent to the DC / AC inverter 16.

  FIG. 4 illustrates the configuration of the control table 37. The control table 37 sets the charge amount and discharge amount of the lithium ion battery 11 for one day (from 0:00 to 24:00) for each predetermined time segment. As an example, the time division of the control table 37 here is 30 minutes, and the electric energy to be charged or discharged is 0 to 2.5 kWh in each time division from 0 to 30 minutes and 30 to 60 minutes per hour. In the range of 0.1 kW. In the control table 37, a setting prohibition time zone that the user cannot set by an external operation is provided for 3 hours, for example. The default value for prohibiting the setting is set, for example, in a time zone of 2 to 5 o'clock, and thereafter, the value can be varied as necessary by an operation input from an external operation means (not shown). This setting prohibition time zone is used by error correction means 41 described later. When error correction is not performed, it is not necessary to provide a setting prohibition time zone.

  The peak shift control means 34 charges and discharges the lithium ion battery 11 with the input / output of, for example, 5 kW, which is the output of the DC / AC inverter 16, and the current on the AC side of the DC / AC inverter 16 is the peak shift control described above. Based on the voltage information, the operation of the DC / AC inverter 16 is controlled so that the input / output is stopped when the lithium ion battery 11 charges or discharges the electric energy set in the control table 37. The discharge power amount set in the control table 37 is an output on the AC side of the DC / AC inverter 16, and the charge power amount is an output on the DC side of the DC / AC inverter 16.

  In the peak shift control by the peak shift control means 34, the upper limit value and the lower limit value of the battery voltage of the lithium ion battery 11 are read from various voltage setting values stored in the voltage / power setting table 38, and the battery voltage is the upper limit value. Is reached until the discharge power amount set in the control table 37 starts discharging other than “0.0”, and when the battery voltage reaches the lower limit value, the control table 37 is reached. The processing is interrupted until the charging power amount set to “2” starts charging other than “0.0”.

  The voltage / power setting table 38 stores and stores necessary power setting values and voltage setting values when the peak shift control means 34 and the peak cut control means 35 control the DC / AC inverter 16. In this embodiment, the peak cut value Wt (unit: kW), the keep power amount Wkp (unit: kWh), etc. are stored as the power set value, and the charge limit voltage Vmax (unit: V), discharge, etc. are stored as the voltage set value. The limit voltage Vmin (unit: V), the charge upper limit voltage Vhlt (unit: V), the discharge lower limit voltage Vllt (unit: V), the power keep voltage Vkp (unit: V), and the like are stored. Among them, the peak cut value Wt and the keep power amount Wkp are values set by the user, and the power keep voltage Vkp can be obtained by referring to a table representing the battery characteristics registered in advance from the keep power amount Wkp value. . Further, the charge limit voltage Vmax, the discharge limit voltage Vmin, the charge upper limit voltage Vhlt, and the discharge lower limit voltage Vllt are set as values unique to the lithium ion battery 11.

  The charge limit voltage Vmax and the discharge limit voltage Vmin correspond to, for example, SOC (State of Charge) of the lithium ion battery 11 of 100% and 0%, respectively. The charge upper limit voltage Vhlt and the discharge lower limit voltage Vllt are, for example, 90% SOC. And 10% respectively. In order to suppress the deterioration of the lithium ion battery 11, charging / discharging is performed between the charging upper limit voltage Vhlt and the discharging lower limit voltage Vllt. Keep power amount Wkp is the amount of power that is kept without being used in peak cut control and peak shift control in case of a disaster. For example, the user keeps the minimum amount of power required for night lighting at the time of power outage, etc. Set as quantity Wkp.

  FIG. 5A shows an example of the relationship between load power consumption and time. In the schedule operation based on the control table 37 shown in FIG. 3, the charging control signal is sent from the control means 31 to the DC / AC inverter 16 between 18 to 21:00, which is the nighttime power period, to charge the lithium ion battery 11. Then, the discharge control signal is sent from the control means 31 to the DC / AC inverter 16 during the daytime period from 11:30 to 15:30, and the lithium ion battery 11 is discharged. In the example of FIGS. 4 and 5A, the time zone for discharging the lithium ion battery 11 by peak shift control is set to coincide with the peak of the power consumption of the load, and the effect of peak cut is also obtained. In addition, wt + 5 shown in FIG. 5A is a power peak value obtained by adding the output of the DC / AC inverter 16 (as an example, 5 kW) to the peak cut value Wt.

  FIG. 5B shows an example of the relationship between the voltage of the lithium ion battery 11 and time during peak shift control. As shown in this figure, the battery voltage is managed between the value of the charging upper limit voltage Vhlt, which is the upper limit value, and the larger value of the power keep voltage Vkp, which is the lower limit value, and the discharge lower limit voltage Vllt.

  In the storage unit 32, a storage area is registered in which a control table 37 of, for example, 12 months × 3 types = 36 patterns can be registered, reflecting the season (12 months) and the weather (clear, cloudy, rain). Further, the control means 31 has a time counting means for counting the date and time, and in order to assign one control table 37 of a specific pattern to each day of the calendar based on this time measuring means, the date and control table 37 Control table allocation information associated with a pattern is set and stored in the priority mode setting table 39 in advance. A plurality of control tables 37 can also be assigned to each day of the calendar. In this case, for example, weather using a control means 31 and an external communication means (for example, Ethernet (registered trademark) communication) not shown. Forecast information is acquired, and an appropriate control table 31 is automatically selected according to the weather. As a result, the peak shift control means 34 selects the control table 37 of the specific pattern assigned to that day from the priority mode setting table 39 when the count of the date and time by the timing means reaches a specific time, for example, 6:00. To start peak shift control.

  In addition, the priority mode setting table 39 gives priority to which of the peak shift control by the peak shift control means 34 and the peak cut control by the peak cut control means 35 to be described later is given to each day of the calendar. It is provided as a setting means for enabling the mode to be set. In this case, when the date and time count by the timing unit reaches a specific time and the peak shift priority mode is set in the priority mode setting table 39 on that day, the peak shift control by the peak shift control unit 34 is performed by the peak cut control. If the priority mode of the peak cut is set in the priority mode setting table 39 on the same day, the peak cut control by the peak cut control unit 35 is set to the peak shift. This is performed in preference to the peak shift control by the control means 34.

  The reason why the control table 37 having a specific pattern is set for each day is to meet the needs of, for example, performing peak cut only during a hot summer day when the peak is likely to occur or during a bon holiday, and performing peak shift on other days. It is. By doing this, peak cut control is performed on days when peak cuts need to be performed to reliably reduce contract power charges, and peak shift control is performed on other days to use cheap nighttime power. Can be greatly reduced.

  FIG. 6 illustrates the configuration of the priority mode setting table 39. In the priority mode setting table 39, priority mode setting information that associates the date and time, the priority mode, and each field of the pattern number of the control table 37 corresponding to each weather is provided for each date. In the example shown in FIG. 6, the peak shift priority mode is set on January 1, and the control table 37 with the number 1 pattern is set when the weather is fine, and the control table 37 with the number 2 pattern is set when the weather is rainy. In the case of clouding, a control table 37 having a pattern of number 3 is set. On March 3rd, the peak shift priority mode is set. When the weather is fine, the pattern 7 control table 37 is set. When the weather is rainy, the pattern 8 control table 37 is set. A control table 37 for nine patterns is set. When the peak cut priority mode is set, the pattern of the control table 37 is not set. The priority mode setting table 39 shown in FIG. 6 is merely an example. For example, in order to reduce the storage capacity of the storage unit 32 as much as possible, the priority mode field is omitted and a value is written in the pattern number field of the control table 37. Whether the peak shift priority mode or the peak cut priority mode is set may be made to be recognized by the control means 31 depending on whether or not the control means 31 is set.

  The peak cut control means 35 performs a peak shift control that reduces the maximum amount of power used by the load (the maximum value of average demand power every 30 minutes) and reduces the contract fee with the electric power company, DC / AC inverter 16 is performed. In the above-described peak shift control, if the discharge time of the lithium ion battery 11 is set so as to match the peak of the amount of power used by the load, it is not necessary to perform peak cut control, but unexpected power use is performed. In this case, the peak cut control means 35 discharges the lithium ion battery 11 so that the load power consumption does not exceed the peak cut value Wt, and the load follow-up control reduces the load power consumption to the peak cut value Wt or less. The peak cut control is performed to cut into two.

  FIG. 7A shows another example of the relationship between the load power consumption and time. Here, in the case of peak shift control, the load power consumption exceeds the peak cut value Wt not only during the daytime when the lithium ion battery 11 is discharged, but also during the nighttime when the lithium ion battery 11 is charged. There is a time zone. On the other hand, in the peak cut priority mode in which peak cut control is preferentially performed, the lithium ion battery 11 is used for the integrated power value exceeding the peak cut value Wt in the time zone in which the power consumption of the load exceeds the peak cut value Wt. Peak cut control means so that the lithium ion battery 11 is charged at a constant voltage aiming at full charge until it reaches the upper limit value of the battery voltage in a time zone during which the electric power consumed by the load does not exceed the peak cut value Wt. 35 instructs the charge / discharge function provided in the control means 31 and sends a charge control signal or a discharge control signal to the DC / AC inverter 16.

  FIG. 7B shows the charge / discharge state of the lithium ion battery 11 in relation to the amount of power used by the load and time as shown in FIG. FIG. 7C shows the relationship between the battery voltage and the time corresponding to FIGS. 7A and 7B. The upper limit value of the battery voltage here is, for example, 400 V, which is a value corresponding to the upper limit voltage Vhlt of the lithium ion battery 11. If the load power consumption exceeds the power peak value Wt + 5, the output of the DC / AC inverter 16 becomes insufficient, and the load power consumption cannot be made equal to or less than the peak cut value Wt. At this time, the peak cut control means 35 continues the discharge of the lithium ion battery 11 by the load follow-up control by the amount of the integrated power value that could not be peak cut even after the load power consumption falls below the peak cut value Wt.

  Returning to FIG. 3 again, the peak shift control means 34 includes an error correction means 41 and a learning function means 42. Even if the error correction means 41 charges and discharges the lithium ion battery 11 according to peak shift control due to factors such as voltage / current and battery temperature measurement errors, and fluctuations in the efficiency of the DC / AC inverter 16, the error correction means 41 is still in the middle of the night. In consideration of the fact that the battery may not be fully charged, a charge control signal is sent to the DC / AC inverter 16 during the peak shift setting prohibition time period in the control table 37 to charge the lithium ion battery 11 every day. The battery is charged up to the upper limit voltage Vhlt. Thereby, the peak shift control by the peak shift control means 34 enables the lithium ion battery 11 to be discharged from a fully charged state with a sufficient capacity during the daytime when the electricity rate is high. Also, during the peak shift setting prohibition time period, the error correction means 41 charges the lithium ion battery 11 with an input of 5 kW corresponding to the output of the DC / AC converter 16, and the battery voltage is stored in the voltage / power setting table 38. When the charging upper limit voltage Vhlt to be reached is reached, the charging is stopped.

  The learning function means 42 is a function that automatically tunes the control table 37 that can reduce the execution of the peak cut control and realize the peak cut only by the peak shift control. Then, when the peak cut is performed with the load power consumption exceeding the peak cut value Wt, the integrated power amount exceeding the peak cut value Wt is set as the discharge power amount in the corresponding time zone of the control table 37. Add and adjust. In the case where the total value of the daily discharge power exceeds the effective storage capacity of the lithium ion battery 11 (capacity from the charge upper limit voltage Vhlt to the power keep voltage Vkp) by the addition adjustment of the discharge power, The display 33 indicates that the storage capacity is insufficient, and the value of the keep power Wkp is automatically reduced by the insufficient power. When the reduction result is negative, a peak shift error is displayed on the display device 33, and the discharge is stopped when the discharge lower limit voltage Vllt is reached.

  Next, the effect | action is demonstrated about the said structure. When the power storage system 1 is turned on, an operating voltage is supplied from the control power supply 26 to the control controller 17 and a transition is made to a standby state. Then, when a start button (not shown) is operated, a transition to the grid connection mode, which is an operating state, is made. .

  FIG. 8 shows a processing procedure of the control means 31 in the grid connection mode. In the figure, when the count of the date and time read from the time measuring means reaches 6 o'clock, which is an example of a specific time, the control means 31 displays specific priority mode setting information including a date that matches the calendar based on the time measuring means. Reading from the priority mode setting table 39 (step S1). And the control means 31 transfers to step S2, and if the priority mode contained in specific priority mode setting information is a peak cut priority mode, it will transfer to step S3 and gave priority to the peak cut by the peak cut control means 35. If the peak shift priority mode is selected instead of the peak cut priority mode, the process shifts to step S4 to cause the peak shift control means 34 to give priority to the peak shift control. This series of procedures is performed at a specific time every day as long as the grid connection mode continues.

  Here, the grid connection mode is a state in which power from the power system 2 is supplied and the power storage system 1 can charge and discharge. The self-sustained operation mode is a state in which no power is supplied from the power system 2 due to a power failure, and it is determined whether power is supplied from the power system 2 by a signal from the current transformer 7, and The self-sustaining operation mode is automatically switched. In the self-sustained operation mode, peak cut control and peak shift control are not performed, and the bidirectional inverter 9 supplies necessary electric power to the electronic device 5 by performing constant voltage control of the power supply path 6.

  The power storage system 1 cannot execute peak shift control and peak cut control at the same time. Therefore, in the present embodiment, the power storage system 1 includes the priority mode setting table 39 that allows the user to select either the peak cut priority mode or the peak shift priority mode and set the priority mode for each day. Different power control becomes possible.

  In the control giving priority to the peak cut in step S3, only the peak cut control is performed, and the peak shift control is not performed. Further, neither the error correction function by the error correction means 41 nor the learning function by the learning function means 42 is executed. The peak cut control means 35 reads the charge upper limit voltage Vhlt and the peak cut value Wt from the voltage / power setting table 38, and discharges the lithium ion battery 11 when the power consumption of the load in the target facility 3 exceeds the peak cut value Wt. Execute peak cut control. If peak cut control is not performed and the amount of power used is lower than the peak cut value Wt, the lithium ion battery 11 is charged with the aim of full charge until the charge upper limit voltage Vhlt is reached. When Vhlt is reached, the charging of the lithium ion battery 11 is stopped. However, when the lithium ion battery 11 is charged to the charging upper limit voltage Vhlt, the peak cut control means 35 controls the operation of the DC / AC inverter 16 so that the amount of power used does not exceed the peak cut value Wt by charging. Further, when the discharge lower limit voltage Vllt (SOC = 10% shown in FIG. 5B) is reached during the peak cut control, the discharge of the lithium ion battery 11 is stopped and the peak cut has not been reached. Is displayed on the display 33.

  FIG. 9 shows a processing procedure for peak cut priority control. First, in step S11, the control means 31 determines whether or not the date and time count by the time measuring means has reached 6 am which is the update time. If it is not 6 am in the morning, the current information from the current transformer 7 is obtained in step S12. The peak cut control means 35 determines whether or not the load power consumption obtained from the voltage information on the AC side of the DC / AC inverter 16 exceeds the peak cut value Wt. If it is determined that the amount of power used by the load exceeds the peak cut value Wt, the process proceeds to step S13, where the amount of power exceeding the peak cut value Wt is discharged from the lithium ion battery 11, and the DC / AC inverter The electric power converted into alternating current at 16 is supplied from the power supply path 6 to the electronic device 5. Then, in the next step S14, if the excess amount of electric power at this time exceeds, for example, 5 kW which is the maximum output of the DC / AC inverter 16, the process proceeds to step S15 and the display device 33 outputs an error. . On the other hand, if the load power consumption does not exceed the peak cut value Wt in step S12, the process returns to step S11.

  Following steps S14 and S15, the peak cut control means 35 determines whether or not the power consumption of the load has fallen below the peak cut value Wt (step S16). If the load power consumption is not below the peak cut value Wt, the process returns to step S13 to continue the discharge of the lithium ion battery 11, but if the load power consumption is below the peak cut value Wt, In step S17, the AC power from the power system 2 is converted into a DC / AC inverter until the battery voltage reaches the charging upper limit voltage Vhlt, which is the target voltage, so that the power consumption of the load does not exceed the peak cut value Wt. 16 is converted into DC power, and the lithium ion battery 11 is charged for a predetermined time. Next, the peak cut control means 35 proceeds to step S18, and determines whether or not the load power consumption exceeds the peak cut value Wt in the same manner as in step S12. If the value exceeds the value Wt, the process returns to step S13 to discharge the lithium ion battery 11. On the other hand, if the load power consumption does not exceed the peak cut value Wt, the process proceeds to step S19, and the battery voltage reaches the target. It is determined whether or not the battery voltage has been reached. If the battery voltage has reached the target voltage, the process returns to step S11. If the battery voltage has not reached the target voltage, the process returns to step S16. Then, in step S11, when the date and time count by the time measuring means reaches 6:00 in the morning, the peak cut priority control for one day ends, and the process returns to the processing procedure of the control means 31 described in FIG.

  Returning to FIG. 8 again, in the control that prioritizes the peak shift in step S4, the same control table 37 as the pattern number included in the specific priority mode setting information is read from the storage means 32, and charge / discharge based on the control table 37 is performed. Perform peak shift control according to the schedule. Further, in this peak shift priority control, an error correction function by the error correction means 41 and a learning function by the learning function means 42 are also performed.

  FIG. 10 shows a processing procedure for the above-described peak shift priority control. First, in step S21, it is determined by the control means 31 whether or not the date and time count by the timing means has reached 6:00 am. If it is not 6:00 am, step S21 is repeated, while if it is 6:00 am, priority is given. Based on the specific priority mode setting information read from the mode setting table, the control table 37 of one pattern whose date and time match is read from the control table 37 of a plurality of patterns (step S22). Next, in step S23, the peak shift control means 34 charges or discharges the lithium ion battery 11 according to the date / time count by the time measuring means based on the read control table 37.

  In the next step S24, the peak shift control means 34 determines whether or not the load power consumption exceeds the peak cut value Wt. If the load power consumption exceeds the peak cut value Wt, the process proceeds to step S25. Then, the amount of power exceeding the peak cut value Wt is measured and stored in the storage means 32. Then, in the next step S26, it is determined whether or not the daily schedule is completed by the peak shift control means 34. If not completed, the process returns to step S23. If completed, the learning function is performed in step S27. The learning function by the means 42 is executed, the daily peak shift priority control is terminated, and the process returns to the processing procedure of the control means 31 described in FIG.

  FIG. 11A is a diagram of a load curve showing a relationship between load power consumption and time before and after applying the above learning function. In this example, before the learning function by the learning function means 42 is applied, the load power consumption peaks not only at 12:30 to 14:30 in the daytime, but also at 18:00 to 20:00 when nighttime power is provided. There is a time zone that exceeds the cut value Wt.

  FIG. 11B shows the relationship between the battery capacity (SOC) before and after applying the learning function and time. In this example, peak shift control is performed by the peak shift control means 34 to charge the lithium ion battery 11 mainly during the nighttime power hours and discharge the lithium ion battery 11 during the daytime hours. Before the application of the learning function, the battery capacity has almost reached the lower limit at 18:00, and even if the power consumption of the load exceeds the peak cut value Wt at that time, the lithium ion battery 11 can be further discharged therefrom. could not. That is, here, since it is possible to save electricity bills by discharging the power charged at night during the daytime, it is set to discharge the charged power before the night power time.

  However, after applying the learning function, as shown by the broken line in FIG. 11B, the set charge amount of the control pattern 37 is updated so that a certain amount of battery capacity is left even in the time zone from 18:00 to 20:00. In this time zone, it is possible to realize a peak shift such that the power consumption of the load does not exceed the peak cut value Wt.

FIG. 12 shows the processing procedure of the learning function performed by the learning function means 42. In the figure, i corresponds to each time segment in which the charge / discharge amount can be individually set in the control table 37, and P _i represents the excess power amount of the load exceeding the peak cut value Wt in the i-th time segment. Since the time division is divided by 30 minutes, i = 1 to 48. SUM _j indicates the integrated power amount at the j-th excess portion where the load power consumption exceeds the peak cut value Wt, and N _j indicates the first division number at the j-th excess portion. Further, S _m represents the discharge power amount set in the control table 37 in the m-th time segment. The excess portion here refers to, for example, a portion where the load power used between 18:00 and 20:00 in FIG. 11A exceeds the peak cut value Wt and the peak shift control has failed.

Here, first, the initial values of i and j are respectively set to 1 in step S31, and it is determined in the subsequent step 32 whether i has reached 48 or not. until i reaches 48, the process proceeds to step S33, whether reading the excess power amount after the measurement stored in the storage unit 32, the excess power amount P _i at the i-th time interval is 0 Is judged. If the excess power amount _Pi is 0, the number of i is incremented by 1 in step S39, and the process returns to step S32.

On the other hand, if the excess power amount _Pi is other than 0 in step S33, the process proceeds to step S34, where the first division number Nj in the _jth excess portion is set as i, and in the next step S35. , The integrated power amount SUM _j at the j-th excess portion is calculated as SUM _j = SUM _j + P _i . This calculation of the integrated power amount SUM _j is repeated until the number of i is incremented by one in the next step 36, and further, in the next step 37, the excess power amount P _i of the i-th time segment becomes zero. In step S37, the excess power amount _{P i} of i-th time interval is zero, terminates the calculation of the integrated electricity SUM _j, after increasing one the number of j in step S38, the number of i in step S39 Is returned to step S32, and the i-th time segment in which the excess power P _i exceeds 0 is searched for. In this way, in the processing routine of steps S31 to S39, how much integrated power amount has exceeded from what time section in i time sections (48 in the example of FIG. 4) defined in the control table 37. Is calculated for each excess portion.

When i reaches 48 in step S32, the process routine of steps S31 to S39 is exited, the initial value of k is set to 0 in step S41, and in step S42, the integrated power amount SUM _j in the j-1st excess portion is obtained. ₋₁ and the discharge power amount S _Nj-1-k of the control table 37 in the N _j −1−kth time section are compared. Here, if the integrated power amount SUM _j-1 is larger than the discharge power amount S _Nj-1-k , the process proceeds to step S43, and the discharge power amount S _Nj of the control table 37 in the N _j −1st time segment. _-1 is adjusted to 0 so that the lithium ion battery 11 is not discharged in that time segment. Then, in the next step S44, the value of k is increased by one, and the process returns to step S42 again.

If the accumulated power amount SUM _j-1 is equal to or less than the discharge power amount S _Nj-1-k in step S42 described above, the process _proceeds to step S45, and the control table 37 in the N _j -1-k-th time segment. of the amount of discharge power S _Nj-1-k is adjusted to 0, at which time segment so as not to discharge the lithium ion battery 11. Then, in the next step S46, j is decremented by one, and if j is not 0 in step S47, the process returns to step S41 again. If j is 0, the discharge power amount in the control table 37 is all adjusted. Then, the learning function process ends.

  As described above, the power storage system 1 according to the present embodiment receives and supplies power from the power system 2 and charges the lithium-ion battery 11 as a secondary battery that supplies the discharged power to the electronic device 5 that is a load. And a control means 31 for controlling the charging / discharging of the lithium ion battery 11, and discharging and using the lithium ion battery 11 so that the power consumption of the load does not exceed the set peak value, the peak cut value Wt. The peak cut control for reducing the electric energy to a peak cut value Wt or less, the lithium ion battery 11 is charged in a time zone where the used electric energy is low, and the lithium ion battery 11 is discharged in a time zone where the used electric energy is high. Configuration in which peak shift control for leveling the power consumption is performed by the peak cut control means 35 and the peak shift control means 34 of the control means 31, respectively. In particular, either the peak cut priority mode that prioritizes peak cut control over peak shift control or the peak shift priority mode that prioritizes peak shift control over peak cut control can be set every day As setting means, the storage means 32 is provided with a priority mode setting table 39.

  In this case, the peak cut is required only for a limited period such as summer, so that the priority mode setting table 39 is used to prioritize the peak cut during the period in which the load power consumption peak appears. While setting the mode to reliably reduce the contract power charge, set the peak shift priority mode during periods when peaks do not appear, and aim to equalize the amount of power used by making the best use of nighttime power, Realize a reduction in electricity usage charges. As a result, for example, a store where the peak of power consumption occurs during the night charge period, no matter what period the peak of power usage appears, realize the desired peak shift and peak cut, It is possible to effectively reduce the contract power charge and the power consumption charge.

  And this is a peak cut control in which the lithium ion battery 11 is discharged to reduce the used power amount to the peak cut value Wt or less so that the used power amount does not exceed the peak cut value Wt, and a time period when the used power amount is low. In the operation system of the power storage system 1 that performs the peak shift control in which the lithium ion battery 11 is charged, the lithium ion battery 11 is discharged in a time period when the power consumption is high, and the power consumption is leveled. This can also be achieved by making it possible to set either the peak cut priority mode in which cut control is given priority or the peak shift priority mode in which peak shift control is given priority every day.

  Moreover, the power storage system 1 of the present embodiment causes the lithium ion battery 11 to be discharged when the amount of power used exceeds the peak cut value Wt in the peak cut priority mode, and the amount of power used is the peak cut value Wt. The peak cut control means 35 of the control means 31 is configured so that the lithium ion battery 11 is charged with the aim of full charge when the maximum charge is not exceeded.

  In this case, in the peak cut priority mode, when the power consumption exceeds the peak cut value Wt, the load follow-up control is performed to discharge the lithium ion battery 11, and the power consumption does not exceed the peak cut value Wt. In between, the lithium ion battery 11 is charged aiming at full charge. Since this charging is performed day and night, for example, even during the daytime, it is possible to efficiently charge the lithium ion battery 11 until the lithium ion battery 11 is fully charged using the interval between peaks.

  In the peak cut priority mode, when the power consumption exceeds the peak cut value Wt, the lithium ion battery 11 is discharged, and when the power consumption does not exceed the peak cut value Wt, full charge is performed. The operation method of the power storage system 1 for charging the lithium ion battery 11 is also achieved.

  Further, the power storage system 1 of the present embodiment causes the lithium ion battery 11 to be charged at a constant voltage with the charging upper limit voltage Vhlt that is the upper limit value of the battery voltage in the charging of the lithium ion battery 11 aiming at full charge. Thus, the control means 31 is configured.

  In this case, in the peak cut priority mode, charging is performed aiming at the upper limit voltage of the lithium ion battery 11 between peaks at the full charge upper limit voltage Vhlt that is not easily affected by deterioration or temperature. Thereby, it is possible to realize a peak cut that makes the best use of the usable battery capacity regardless of the deterioration of the lithium ion battery 11 or the decrease of the battery capacity due to the temperature drop.

  This can also be achieved by operating a power storage system that performs constant voltage charging of the lithium ion battery 11 at the charging upper limit voltage Vhlt when charging the lithium ion battery 11 aiming at full charge.

  Further, the power storage system 1 according to the present embodiment provides the control unit 31 with a learning function unit 42 that adjusts the charging / discharging amount of the lithium ion battery 11 for each hour according to the power consumption amount of the load in the peak shift priority mode. I have.

  In this case, in the peak shift priority mode, a schedule operation for charging / discharging the lithium ion battery 11 is performed according to the charge / discharge amount set by default for each time section, and during the execution of the schedule operation, for example, use of a load is performed. When the electric energy exceeds the peak cut value Wt, the set charge / discharge amount is automatically adjusted. As a result, even in the peak shift priority mode, the power consumption can be prevented from exceeding the peak value, and the power consumption pattern can be collected and analyzed by automatically adjusting the charge / discharge amount. Can be eliminated, and the setting of the charge / discharge amount can be greatly simplified. In other words, schedule operation is performed using operation plan data of typical specific stores, etc., and data collection and analysis work for each store is eliminated by a learning function that automatically corrects this operation plan data when the peak is exceeded. can do.

  This is also achieved in the operation mode of the power storage system 1 having a learning function for adjusting the charge / discharge amount of the lithium ion battery 11 for each hour according to the amount of power used in the peak shift priority mode.

  Moreover, the power storage system 1 of the present embodiment includes a control table 37 for performing daily peak shift control in which a charge amount and a discharge amount every 30 minutes, which is a fixed time, can be set in the peak shift priority mode. In the peak shift control, the lithium ion battery 11 is charged or discharged based on the charge amount or the discharge amount registered in the control table 37.

  In this case, in the peak shift priority mode, peak shift control for charging or discharging the lithium ion battery 11 can be performed in units of one day based on the charge amount or the discharge amount at regular intervals registered in the control table 37. It becomes possible. Further, by making the fixed time coincide with 30 minutes, which is the contract power calculation standard, peak cut control for reducing contract power can be accurately performed.

  This is also achieved by the operation method of the power storage system 1 that charges or discharges the lithium ion secondary battery 11 in the same manner.

  In addition, the power storage system 1 of the present embodiment has a setting prohibition time zone in which the charge amount or the discharge amount cannot be set in the control table 37 used in the peak shift priority mode. An error correction means 41 is provided as a configuration for correcting an error in the remaining battery level by charging the lithium ion battery 11 aiming at charging.

  In this case, the secondary battery can be charged with the aim of full charge during the setting prohibition time period registered in the control table 37, and the lithium ion battery 11 is fully charged by correcting an error in the remaining battery level. By discharging from the state, the lithium ion battery 11 can be used effectively without waste.

  This is also achieved by the operation method of the power storage system 1 that similarly corrects the error of the remaining battery level.

  Further, in the peak shift priority mode, the power storage system 1 of the present embodiment can register a plurality of control tables 37 in the storage unit 31 for the same day, for example, acquired from the outside such as weather forecast information. Based on the information, one control table 37 is automatically selected from a plurality of control tables 37, and the peak shift control means 34 executes peak shift control based on the control table 37.

  In this case, one specific control table 37 is selected from among a plurality of control tables 37 registered for the same day in the storage means 31 based on information acquired from the outside, and based on the selected control table 37. By charging or discharging the lithium ion battery 11, an appropriate control table 37 corresponding to weather conditions, local events, or the like is selected, and peak shift control is performed based on the control table 37. A cut can be realized.

  This is also achieved by the operation method of the power storage system 1 that similarly performs the peak shift control.

  Furthermore, in the power storage system 1 of the present embodiment, the user sets a keep power amount Wkp that holds a constant power amount in preparation for a power failure, and a power keep voltage Vkp that is a battery voltage value corresponding to the keep power amount Wkp. The power keep voltage Vkp and the discharge lower limit voltage value Vllt in the normal use range of the battery in consideration of the deterioration of the battery are compared, and the battery voltage of the lithium ion battery 11 becomes the power keep voltage Vkp and the discharge lower limit voltage value. When any voltage value of Vllt is reached, the discharge of peak cut control and peak shift control is stopped.

  In this case, when the battery voltage of the lithium ion battery 11 reaches a voltage value which is larger of the power keep voltage Vkp corresponding to the keep power amount Wkp or the discharge lower limit voltage value Vllt, the lithium ion battery by the peak cut control or the peak shift control. By stopping the discharge of 11, it is possible to reliably maintain a certain amount of power prepared in the event of a power failure, and at the same time, to suppress deterioration of the battery due to falling below the discharge lower limit voltage value Vllt.

  This is also achieved by the operation method of the power storage system 1 that similarly stops the discharge of the peak cut control and the peak shift control.

  In addition, this invention is not limited to the said Example, A various change, correction, and improvement are possible in the range which does not deviate from the meaning of this invention. For example, the numbers shown in the present embodiment are merely examples, and can be appropriately changed according to the specifications of the power storage system 1. A secondary battery other than the lithium ion battery 11 may be used, and the learning function means 42 may be configured to increase or decrease not only the discharge amount of the control table 37 but also the charge amount.

1 Power storage system (load)
2 Power system 5 Electronic equipment (load)
11 Lithium ion battery (secondary battery)
31 Control means 32 Storage means (storage device)
37 Control table 39 Priority mode setting table (setting means)
42 Learning function means

Claims (10)

Peak cut control for discharging the secondary battery and reducing the power consumption to the peak value or less so that the load power consumption does not exceed the set peak value;
Charging the secondary battery to the electric power consumption is low time zone, and discharging the secondary battery to the electric power consumption is high time period, performing a peak shift control to equalize the amount of electric power used, the An operation method of the power storage system,
A peak cut priority mode that gives priority to the peak cut control and a peak shift priority mode that gives priority to the peak shift control are set every day ,
The peak shift priority mode includes a control table for performing daily peak shift control in which a charge amount and a discharge amount can be set for each fixed time, and in the peak shift control, a charge amount or a discharge amount registered in the control table. And charging or discharging the secondary battery,
The control table used in the peak shift priority mode has a setting prohibition time zone in which a charge amount or a discharge amount cannot be set, and in the setting prohibition time zone, by charging the secondary battery aiming at full charge An operation method of the power storage system characterized by correcting an error in the remaining battery level .   In the peak cut priority mode, the secondary battery is discharged when the used electric energy exceeds the peak value, and the secondary battery is aimed at full charge when the used electric energy does not exceed the peak value. The operation method of the power storage system according to claim 1, wherein the battery is charged.   3. The power storage system operating method according to claim 2, wherein in charging the secondary battery aiming at full charge, the secondary battery is charged at a constant voltage with an upper limit value of the battery voltage.   2. The power storage system operating method according to claim 1, further comprising: a learning function that adjusts a charge / discharge amount of the secondary battery for each hour according to the power consumption amount in the peak shift priority mode. In the peak shift priority mode, a plurality of the control tables can be registered for the same day, and one of the control tables is automatically selected based on weather forecast information and event information acquired from the outside. to select, operation method of a power storage system according to claim 1, wherein the performing the peak shift control. A secondary battery that is charged by receiving power supplied from the power system and supplies the discharged power to the load, and a control unit that controls charging and discharging of the secondary battery,
Peak cut control for discharging the secondary battery and reducing the power consumption to the peak value or less so that the power consumption of the load does not exceed the set peak value;
Charging the secondary battery to the electric power consumption is low time zone, and discharging the secondary battery to the electric power consumption is high hours, and peak shift control to equalize the amount of electric power used, the A power storage system configured to be performed by a control means,
A setting means for setting, every day, a peak cut priority mode that gives priority to the peak cut control and a peak shift priority mode that gives priority to the peak shift control ,
The peak shift priority mode includes a control table for performing daily peak shift control in which a charge amount and a discharge amount can be set for each fixed time, and in the peak shift control, a charge amount or a discharge amount registered in the control table. Based on the configuration, the secondary battery is configured to be charged or discharged,
The control table used in the peak shift priority mode has a setting prohibition time zone in which a charge amount or a discharge amount cannot be set, and in the setting prohibition time zone, by charging the secondary battery aiming at full charge The power storage system is configured to correct an error in the remaining battery level . In the peak cut priority mode, the secondary battery is discharged when the used electric energy exceeds the peak value, and when the used electric energy does not exceed the peak value, the second battery is aimed at full charge. The power storage system according to claim 6 , wherein the control unit is configured to charge a secondary battery. 8. The control unit according to claim 7 , wherein in the charging of the secondary battery aimed at the full charge, the control unit is configured to perform constant voltage charging of the secondary battery at an upper limit value of a battery voltage. Power storage system. 7. The power according to claim 6, wherein, in the peak shift priority mode, the control means includes learning function means for adjusting a charge / discharge amount of the secondary battery for each hour according to the power consumption. Storage system. In the peak shift priority mode, a plurality of the control tables can be registered for the same day, and one of the control tables is automatically selected based on weather forecast information and event information acquired from the outside. The power storage system according to claim 6 , wherein the power storage system is configured to perform peak shift control.

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